Automatic assembly equipment for SMA (shape memory alloy) of seat airbag control valve

Abstract

The utility model relates to the technical field of automatic assembly equipment, in particular to automatic assembly equipment for a seat airbag control valve memory metal wire SMA. A gripper system; a transfer system; the valve core is provided with a clamping jaw system; an annular conveyor line; the wire feeding, wire storing, needle threading and wire collecting system comprises a wire feeding mechanism, a wire storing and tensioning mechanism and a threading mechanism, the wire storing and tensioning mechanism pulls down the metal wire SMA through a gravity hammer so as to apply constant tensioning force to the metal wire SMA, and the threading mechanism is used for leading out the metal wire SMA in a wire storing barrel to penetrate into a square hole of the valve element; according to the utility model, through cooperative work of a plurality of skillfully designed systems, the height tolerance of the released metal wire SMA can be controlled within the range of 0.2 mm, the requirements that the drawing force of the metal wire SMA is greater than or equal to 4N and the metal wire SMA and a V-shaped groove do not generate relative movement are met, the high-precision assembly of a product is ensured, and the quality and qualified rate of the product are improved.

Description

Technical Field

[0001] This utility model relates to the field of automated assembly equipment technology, and in particular to an automated assembly equipment for a seat airbag control valve memory metal wire SMA. Background Technology

[0002] In the production of seat airbag control valves, traditional electromagnetically driven seat airbag control valves have many drawbacks. With technological advancements, a new type of seat airbag control valve using shape memory metal wire (SMA) to drive the valve core has emerged. While this new control valve offers significant advantages, it faces considerable challenges in the assembly process.

[0003] The shape memory wire SMA has limitations in terms of thermal shrinkage, making its assembly requirements extremely stringent. On one hand, the height tolerance of the valve core after installation must be controlled within a very small range of 0.20mm. The relative height of the SMA within the V-groove affects the overall valve core height. On the other hand, the SMA must be kept taut during installation, and its length varies with different tension forces. Furthermore, the SMA's diameter is only 0.05mm. Stable clamping and precise insertion into the approximately 2mm square hole in the center of the valve core during assembly, as well as precise riveting to the V-groove and controlling the shear length after riveting, are all pressing challenges. In addition, approximately 40,000N of pressure is required during the riveting process to ensure the SMA is firmly riveted into the V-groove. Currently, the market urgently needs a high-precision automated assembly machine for inserting shape memory metal wire SMAs (Screen Wire Assembly Machining), meeting stringent requirements such as controlling the height tolerance within 0.20mm after SMA installation, maintaining a pull-out force of ≥4N, and ensuring no relative movement between the SMA and the V-groove. This project aims to develop an automated assembly machine for shape memory metal wire SMAs used in seat airbag control valves to address this problem. Utility Model Content

[0004] In view of at least one of the above technical problems, the present invention provides an automated assembly equipment for the memory metal wire (SMA) of the seat airbag control valve, and solves the problem by adopting the following technical solution.

[0005] According to one aspect of the present invention, an automated assembly device for a seat airbag control valve memory metal wire (SMA) is provided, comprising:

[0006] An automatic valve core feeding system is used to sort and push valve cores.

[0007] The gripper system is located at the output end of the automatic valve core feeding system. It is used to receive the valve cores sorted and pushed by the automatic valve core feeding system and to grip them in groups.

[0008] The transfer system, located at the output end of the gripper system, is used to receive and transport the valve cores grasped in groups by the gripper system, and to verify whether the valve cores are in the correct position.

[0009] The valve core mounting gripper system is located at the output end of the transfer system and is used to receive the valve cores transported by the transfer system and install the valve cores onto the product.

[0010] A circular conveyor line connects the valve core mounting gripper system and the wire feeding, storage, needle threading, and take-up system to transport products with valve cores to the wire feeding, storage, needle threading, and take-up system.

[0011] The wire feeding, storage, threading, and take-up system includes a wire feeding mechanism, a wire storage tensioning mechanism, a threading mechanism, and a pressing and riveting shearing system. The wire storage tensioning mechanism includes a wire storage drum and a gravity hammer. The wire feeding mechanism is used to feed shape memory metal wire (SMA) to the wire storage drum. The wire storage drum pulls down the SMA through the gravity hammer to apply a constant tension force to the SMA. The threading mechanism is used to lead out the SMA from the wire storage drum and thread it into the square hole of the valve core, and straighten the SMA.

[0012] The press-fit and shearing system includes a lever-type pressure amplification device and a scissor mechanism. The lever-type pressure amplification device is used in conjunction with the threading mechanism to press-fit the metal wire SMA onto the product, and the scissor mechanism is used to cut the metal wire SMA.

[0013] The present invention is further configured such that the automatic valve core feeding system includes a vibratory feeder, and the output end of the vibratory feeder is equipped with a material blocking cylinder and a material cutting cylinder. After the vibratory feeder arranges the valve cores, it is conveyed to the material blocking cylinder for separation, and the material cutting cylinder pushes the separated valve cores to the gripper system.

[0014] The present invention is further configured such that the gripper system includes a transverse electric cylinder, an up-and-down lifting cylinder and a gripper cylinder, wherein the gripper cylinder is located at the output end of the cutting cylinder and is used to grip the valve core pushed by the cutting cylinder. The transverse electric cylinder and the up-and-down lifting cylinder work together to drive the gripper cylinder to move to the transfer system.

[0015] The present invention is further configured such that the transfer system includes a gripper, the gripper is disposed at the output end of the transfer system and is used to pick up the valve core conveyed by the gripper cylinder, and the gripper is connected to the transfer cylinder, the transfer cylinder is used to transfer the valve core held by the gripper to the valve core mounting gripper system.

[0016] The transfer system is also equipped with detection sensors to confirm the correct position of the valve core. If the position is off, the defective product is rejected through the waste box.

[0017] The present invention is further configured such that the valve core mounting gripper system includes a valve core mounting cylinder, a lifting blocking cylinder, a lateral moving electric cylinder, a gripper position switching servo, and a valve core mounting gripper. The lateral moving electric cylinder drives the valve core mounting gripper to move to the output end of the transfer system, and the position of the valve core mounting gripper is adjusted by the lifting cylinder and the gripper position switching servo to install the valve core onto the product.

[0018] The present invention is further configured such that the wire feeding mechanism includes a wire feeding servo, a wire drum, and a wire winding wheel. The wire feeding servo is used to drive the wire drum to rotate so that the wire SMA on the wire drum is fed out. The wire winding wheel is used to limit the feeding position of the wire SMA above the wire storage drum.

[0019] The present invention is further configured such that the wire storage tensioning mechanism also includes:

[0020] A gravity hammer drop detection sensor is used to monitor whether a gravity hammer has fallen.

[0021] The lower limit sensor and the upper limit sensor are used to detect the minimum and maximum height of the gravity hammer, respectively, in order to control the length of the SMA wire.

[0022] Tensioner detection device, used to detect the tension force of SMA wire; and

[0023] The reversible winding wheel is used to adjust the SMA path of the metal wire to cooperate with the tensioner detection device.

[0024] The present invention is further configured such that the threading mechanism includes a needle-threading cylinder, a take-up cylinder, a take-up clamp, a wire-feeding cylinder, a wire-feeding clamp, a tensioning wheel rotating cylinder, a needle, and a tensioning wheel. The needle is fixed at the end of the piston rod of the needle-threading cylinder and is used to drive the needle to pass through the assembly hole along the valve core axis. The wire-feeding clamp is linked with the wire-feeding cylinder and clamps the metal wire SMA after the needle passes through the assembly hole and pushes it to a set length. The take-up clamp is linked with the take-up cylinder and clamps the tail end of the metal wire SMA when the metal wire SMA reaches the set length. It alternately opens and closes with the wire-feeding clamp to stepwise convey the metal wire SMA. The tensioning wheel adjusts the wheel surface angle through the tensioning wheel rotating cylinder to maintain the conveying tension of the metal wire SMA.

[0025] This utility model has the following technical effects:

[0026] The application of this automated assembly equipment reduces manual operations, improves production efficiency, and lowers labor costs. Simultaneously, by precisely controlling the use of shape memory metal wire (SMA), material waste is reduced, further cutting production costs and bringing greater economic benefits to the company.

[0027] Furthermore, this equipment, through the coordinated operation of multiple cleverly designed systems, including an automatic valve core feeding system, a wire feeding, storage, threading, and take-up system, can precisely control the installation tension, threading position, riveting force, and cutting length of the metal wire SMA. It can control the height tolerance of the released metal wire SMA within 0.2mm, meeting the requirements of a metal wire SMA pull-out force ≥4N and no relative movement between the metal wire SMA and the V-groove, ensuring high-precision assembly and improving product quality and yield.

[0028] Furthermore, in the riveting process, the lever principle is used to amplify the output force, allowing for greater pressure to be achieved with a smaller cylinder, thus saving equipment space. The gravity hammer drop detection sensor, upper and lower limit sensors, and tensioning wheel detection device in the wire tensioning mechanism monitor and ensure the stability of the SMA wire in real time, guaranteeing the stability and reliability of the entire assembly process. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a three-dimensional view of the entire utility model;

[0031] Figure 2 This is a perspective view of the automatic valve core feeding system, gripper system, and transfer system of this utility model;

[0032] Figure 3 This is a perspective view of the valve core mounting gripper system in this utility model;

[0033] Figure 4 This is a perspective view of the wire feeding, storage, needle threading, and take-up system of this utility model.

[0034] Figure label:

[0035] 1.1 Automatic valve core feeding system; 1.11 Vibratory feeder; 1.12 Cutting cylinder; 1.13 Material blocking cylinder;

[0036] 1.2 Gripper system; 1.21 Lateral electric cylinder; 1.22 Vertical lifting cylinder; 1.23 Gripper cylinder;

[0037] 1.3 Transfer system; 1.31 Gripper; 1.32 Transfer cylinder; 1.33 Detection sensor; 1.34 Waste box;

[0038] 1.4 Valve core mounting gripper system; 1.41 Valve core mounting cylinder; 1.42 Lifting and blocking cylinder; 1.43 Lateral electric cylinder; 1.44 Gripper position switching servo; 1.45 Valve core mounting gripper;

[0039] 1.5 Circular conveyor line;

[0040] 1.6. Press-fit shearing system;

[0041] 1.7 Threading mechanism; 1.71 Needle-threading cylinder; 1.72 Take-up cylinder; 1.73 Take-up gripper; 1.74 Thread-feeding cylinder; 1.75 Thread-feeding gripper; 1.76 Tensioner rotary cylinder; 1.77 Needle; 1.78 Tensioner;

[0042] 1.8 Wire storage tensioning mechanism; 1.81 Wire storage drum; 1.82 Gravity hammer; 1.83 Gravity hammer drop detection sensor; 1.84 Lower limit sensor; 1.85 Upper limit sensor; 1.86 Direction changing winding wheel; 1.87 Tensioning wheel detection device;

[0043] 1.9 Wire feeding mechanism; 1.91 Wire feeding servo; 1.92 Wire reel; 1.93 Wire winding wheel. Detailed Implementation

[0044] Please see Figures 1 to 4 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the technical terms used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0045] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model.

[0046] In this embodiment of the present invention, such as Figures 1-4 As shown, an automated assembly device for a seat airbag control valve memory metal wire (SMA) is provided, comprising:

[0047] Automatic valve core feeding system 1.1, which is used to sort and push valve cores;

[0048] The gripper system 1.2 is located at the output end of the automatic valve core feeding system 1.1 and is used to receive the valve cores sorted and pushed by the automatic valve core feeding system 1.1 and to grip them in groups.

[0049] The transfer system 1.3, which is located at the output end of the gripper system 1.2, is used to receive and transport the valve cores grabbed in groups by the gripper system 1.2, and to verify whether the valve cores are in the correct position.

[0050] The valve core mounting gripper system 1.4 is located at the output end of the transfer system 1.3 and is used to receive the valve cores conveyed by the transfer system 1.3 and install the valve cores onto the product.

[0051] A circular conveyor line 1.5, connected between the valve core mounting gripper system 1.4 and the wire feeding, storage, needle threading, and take-up system, is used to convey products equipped with valve cores to the wire feeding, storage, needle threading, and take-up system; and

[0052] The wire feeding, storage, threading, and take-up system includes a wire feeding mechanism 1.9, a wire storage tensioning mechanism 1.8, a threading mechanism 1.7, and a crimping and shearing system 1.6. The wire storage tensioning mechanism 1.8 includes a wire storage bin 1.81 and a gravity hammer 1.82. The wire feeding mechanism 1.9 is used to feed shape memory metal wire (SMA) to the wire storage bin 1.81. The wire storage bin 1.81 pulls down the metal wire SMA through the gravity hammer 1.82 to apply a constant tension force to the metal wire SMA. The threading mechanism 1.7 is used to lead out the metal wire SMA in the wire storage bin 1.81 and thread it into the square hole of the valve core, and straighten the metal wire SMA.

[0053] The press-fit and shearing system 1.6 includes a lever-type pressure amplification device and a scissor mechanism. The lever-type pressure amplification device is used in conjunction with the threading mechanism 1.7 to press-fit the metal wire SMA onto the product, and the scissor mechanism is used to cut the metal wire SMA.

[0054] It should be noted that this assembly equipment mainly consists of multiple systems working in concert. During the actual assembly process, the automatic valve core feeding system 1.1 uses the vibration of the vibratory feeder 1.11 to neatly arrange the disordered valve cores. Then, with the cooperation of the baffle cylinder 1.13 and the cutting cylinder 1.12, the valve cores are pushed out one by one. The gripper system 1.2's gripper cylinder 1.23, driven by the horizontal movement cylinder 1.21 and the vertical lifting cylinder 1.22, accurately grips and groups the valve cores. The transfer system 1.3's gripper 1.31 receives the valve cores, and the transfer cylinder 1.32 transfers them. The detection sensor 1.33 monitors the valve core position in real time; valve cores in incorrect positions are rejected and placed in the waste box 1.34. The valve core installation gripper system 1.4, in coordination with components such as the horizontal movement cylinder 1.43 and the valve core installation cylinder 1.41, installs the valve cores onto the product. The circular conveyor line 1.5 is responsible for smoothly transporting the products equipped with valve cores to the wire feeding, storage, threading, and take-up system. Driven by the wire feeding servo 1.91, the wire feeding mechanism 1.9 feeds the wire SMA from the wire spool 1.92, which then passes through the wire winding wheel 1.93 and enters the wire storage bin 1.81. A gravity hammer 1.82 pulls down the wire SMA to tighten it. The threading mechanism 1.7's threading cylinder 1.71 drives the needle 1.77 to pass through the square hole of the valve core. The wire feeding cylinder 1.74 and wire feeding gripper 1.75 push the wire SMA, while the take-up gripper 1.73 and take-up cylinder 1.72 cooperate for subsequent operations. Finally, the lever-type pressure amplification device of the press-riveting and shearing system 1.6 applies 40,000N of pressure through the electric cylinder spindle to press the metal wire SMA into the V-groove; the shearing mechanism cuts the metal wire SMA with self-made compact shears to ensure that the tail residual length is ≤1mm, thus completing the entire assembly process.

[0055] Each system operates sequentially according to a preset program, automating the process of valve core feeding, transfer, installation, wire SMA feeding, threading, riveting, and shearing; it also automates the assembly of the memory wire SMA for the seat airbag control valve, improving production efficiency and assembly accuracy, meeting high-precision assembly requirements, and controlling the height tolerance of the wire SMA within 0.2mm, thus reducing human error.

[0056] In one embodiment of this utility model, the automatic valve core feeding system 1.1 includes a vibratory feeder 1.11. The output end of the vibratory feeder 1.11 is equipped with a baffle cylinder 1.13 and a cutting cylinder 1.12. The vibratory feeder 1.11 arranges the valve cores and then conveys them to the baffle cylinder 1.13 for separation. The cutting cylinder 1.12 pushes the separated valve cores to the gripper system 1.2.

[0057] It should be noted that the core component of the automatic valve core feeding system 1.1 is the vibratory feeder 1.11, which uses vibration to gradually arrange the valve cores in an orderly manner on the track, and then conveys them to the blocking cylinder 1.13. The piston rod of the blocking cylinder 1.13 extends to block subsequent valve cores, realizing the separation of individual valve cores. After receiving a signal, the cutting cylinder 1.12 pushes the separated valve cores to the gripping position of the gripper system 1.2.

[0058] The vibration of the vibratory feeder 1.11 and the action of the material blocking and cutting cylinder 1.12 work together to achieve automatic sorting and pushing of valve cores. This ensures that valve cores can be supplied to subsequent assembly stages in an orderly and stable manner, improving feeding efficiency and accuracy.

[0059] In one embodiment of this utility model, the gripper system 1.2 includes a transverse electric cylinder 1.21, an up-down lifting cylinder 1.22, and a gripper cylinder 1.23. The gripper cylinder 1.23 is located at the output end of the cutting cylinder 1.12 and is used to grip the valve core pushed by the cutting cylinder 1.12. The transverse electric cylinder 1.21 and the up-down lifting cylinder 1.22 work together to drive the gripper cylinder 1.23 to move to the transfer system 1.3.

[0060] It should be noted that in the gripper system 1.2, the gripper cylinder 1.23 is located at the output end of the cutting cylinder 1.12. When the valve core is pushed in, the piston rod of the gripper cylinder 1.23 extends to grip the valve core. The horizontal movement cylinder 1.21 and the vertical lifting cylinder 1.22 work together. The horizontal movement cylinder 1.21 controls the gripper cylinder 1.23 to move horizontally, and the vertical lifting cylinder 1.22 controls its movement vertically, thereby accurately moving the gripper cylinder 1.23 that grips the valve core above the transfer system 1.3.

[0061] The valve core is grasped and transferred through the coordinated movement of the components in the gripper system 1.2. This allows for precise transfer of the valve core from one position to another, ensuring the continuity and accuracy of the assembly process.

[0062] In one embodiment of the present invention, the transfer system 1.3 includes a gripper 1.31, which is disposed at the output end of the transfer system 1.3 and is used to pick up the valve core conveyed by the gripper cylinder 1.23. The gripper 1.31 is connected to the transfer cylinder 1.32, which is used to transfer the valve core held by the gripper 1.31 to the valve core mounting gripper system 1.4.

[0063] The transfer system 1.3 is also equipped with a detection sensor 1.33 to confirm the correct position of the valve core. If the position is deviated, the defective product is rejected through the waste box 1.34.

[0064] It should be noted that the gripper 1.31 of the transfer system 1.3 opens to grab the valve core when the gripper cylinder 1.23 delivers it, and then closes to clamp it. The transfer cylinder 1.32 pushes the gripper 1.31 and the valve core to move towards the valve core mounting gripper system 1.4. The detection sensor 1.33 monitors the valve core position in real time. Once a deviation in the valve core position is detected, it controls the gripper 1.31 to open and discard the valve core into the waste box 1.34.

[0065] The gripper 1.31 grasps and transfers the valve core, while the detection sensor 1.33 monitors and rejects defective products in real time. This ensures that the valve core is correctly positioned before entering subsequent assembly stages, improving product assembly quality.

[0066] In one embodiment of this utility model, the valve core mounting gripper system 1.4 includes a valve core mounting cylinder 1.41, a lifting and blocking cylinder 1.42, a lateral movement electric cylinder 1.43, a gripper position switching servo 1.44, and a valve core mounting gripper 1.45. The lateral movement electric cylinder 1.43 drives the valve core mounting gripper 1.45 to move to the output end of the transfer system 1.3, and adjusts the position of the valve core mounting gripper 1.45 by the lifting cylinder 1.41 and the gripper position switching servo 1.44 to mount the valve core onto the product.

[0067] It should be noted that in the valve core mounting gripper system 1.4, the lateral movement electric cylinder 1.43 drives the valve core mounting gripper 1.45 to move to the output end of the transfer system 1.3. The lifting cylinder 1.41 extends, causing the valve core mounting gripper 1.45 to rise. The gripper position switching servo 1.44 adjusts the angle and position of the valve core mounting gripper 1.45 according to the product model and size. After adjustment, the valve core mounting gripper 1.45 grasps the valve core, the lateral movement electric cylinder 1.43 actuates again, moving the valve core mounting gripper 1.45 to the product installation position. Finally, the valve core mounting cylinder 1.41 retracts, installing the valve core onto the product.

[0068] The valve core is precisely installed through the coordinated action of multiple components. This allows for the adaptation of valve core installation requirements for different product models, making the production line more flexible and improving production agility.

[0069] In one embodiment of this utility model, the wire feeding mechanism 1.9 includes a wire feeding servo 1.91, a wire drum 1.92, and a wire winding wheel 1.93. The wire feeding servo 1.91 is used to drive the wire drum 1.92 to rotate so that the wire SMA on the wire drum 1.92 is fed out. The wire winding wheel 1.93 is used to restrict the feeding position of the wire SMA above the wire storage drum 1.81.

[0070] It should be noted that in the wire feeding mechanism 1.9, after the wire feeding servo 1.91 is powered on and started, it drives the wire drum 1.92 to rotate, causing the wire SMA on the wire drum 1.92 to be gradually released. The wire winding wheel 1.93 guides the direction of the wire SMA and restricts its delivery position above the wire storage bin 1.81, ensuring that the wire SMA can smoothly enter the wire storage bin 1.81.

[0071] The wire feeding servo 1.91 drives the wire drum 1.92 to rotate and feed the wire, while the wire winding wheel 1.93 guides the direction of the wire SMA (Wire Wire Magnetic Association). This provides a stable source of wire SMA for the wire storage and tensioning mechanism 1.8, ensuring the continuity of wire SMA supply.

[0072] In one embodiment of this utility model, the wire tensioning mechanism 1.8 further includes:

[0073] Gravity hammer drop detection sensor 1.83 is used to monitor whether gravity hammer 1.82 has fallen;

[0074] The lower limit sensor 1.84 and the upper limit sensor 1.85 are used to detect the minimum and maximum height of the gravity hammer 1.82, respectively, in order to control the length of the SMA wire.

[0075] Tensioner detection device 1.87, used to detect the tension force of SMA wire; and

[0076] The direction-changing winding wheel 1.86 is used to adjust the SMA path of the metal wire to cooperate with the tension wheel detection device 1.87.

[0077] It should be noted that in the wire storage and tensioning mechanism 1.8, the gravity hammer drop detection sensor 1.83 monitors the status of the gravity hammer 1.82 in real time. If the gravity hammer 1.82 falls, the sensor immediately sends a signal to notify the operator or control system for handling. The lower limit sensor 1.84 and the upper limit sensor 1.85 detect the minimum and maximum height of the gravity hammer 1.82, respectively. When the gravity hammer 1.82 falls to the position of the lower limit sensor 1.84, it indicates that the wire SMA storage length has reached the minimum value, and the control system controls the wire feeding servo 1.91 to start wire feeding; when the gravity hammer 1.82 rises to the position of the upper limit sensor 1.85, it indicates that the wire SMA storage length has reached the maximum value, and the wire feeding servo 1.91 stops wire feeding. The tensioning wheel detection device 1.87 detects the tension force of the wire SMA in real time and feeds the data back to the control system, which adjusts the actions of relevant components based on the feedback. The winding wheel 1.86 is used to adjust the path of the metal wire SMA, so that the metal wire SMA contacts the tension wheel detection device 1.87 at a suitable angle and position, ensuring accurate detection of tension force.

[0078] By employing a combination of sensors and components, precise control of the tension and storage length of the SMA wire is achieved. This ensures that the SMA wire maintains appropriate tension and storage length throughout the assembly process, meeting assembly accuracy requirements.

[0079] In one embodiment of this utility model, the threading mechanism 1.7 includes a needle-threading cylinder 1.71, a take-up cylinder 1.72, a take-up clamp 1.73, a wire-feeding cylinder 1.74, a wire-feeding clamp 1.75, a tensioning wheel rotating cylinder 1.76, a needle 1.77, and a tensioning wheel 1.78. The needle 1.77 is fixed at the end of the piston rod of the needle-threading cylinder 1.71, which is used to drive the needle 1.77 to pass through the assembly hole along the valve core axis. The wire-feeding clamp 1.75 and the wire-feeding clamp 1.78... The cylinder 1.74 is linked to clamp the metal wire SMA after the needle 1.77 enters the assembly hole and pushes it to the set length. The take-up clamp 1.73 is linked with the take-up cylinder 1.72 to clamp the tail end of the metal wire SMA when it reaches the set length, and alternately opens and closes with the wire feeding clamp 1.75 to step-feed the metal wire SMA. The tensioning wheel 1.78 adjusts the wheel surface angle through the tensioning wheel rotation cylinder 1.76 to maintain the conveying tension of the metal wire SMA.

[0080] It should be noted that when the threading mechanism 1.7 is working, the piston rod of the threading cylinder 1.71 extends, driving the needle 1.77 fixed at its end to slowly and precisely thread into the valve core assembly hole along the valve core axis. The wire feeding gripper 1.75, driven by the wire feeding cylinder 1.74, opens to clamp the metal wire SMA. The wire feeding cylinder 1.74 pushes the wire feeding gripper 1.75, pushing the metal wire SMA to the set length. The wire take-up gripper 1.73, driven by the wire take-up cylinder 1.72, clamps the tail end of the metal wire SMA when it reaches the set length. The wire feeding gripper 1.75 and the wire take-up gripper 1.73 open and close alternately to achieve step-by-step feeding of the metal wire SMA. The tensioning wheel 1.78, driven by the tensioning wheel rotary cylinder 1.76, adjusts the wheel surface angle in real time according to the feeding status of the metal wire SMA, applying appropriate pressure to the metal wire SMA and maintaining the feeding tension of the metal wire SMA.

[0081] The insertion, conveying, and tension control of the SMA (Surface Mount Metal Wire) are achieved through the coordinated action of multiple cylinders and grippers. This allows for precise insertion of the SMA into the square hole of the valve core and ensures stable tension during conveying, meeting assembly accuracy requirements.

[0082] Working principle:

[0083] After the vibratory feeder 1.11 is activated, its own vibration causes the valve cores to gradually align on the track and be conveyed to the baffle cylinder 1.13. When the valve cores reach the baffle cylinder 1.13, the piston rod of the baffle cylinder 1.13 extends to block subsequent valve cores, thus separating a single valve core. The piston rod of the cutting cylinder 1.12 then extends, pushing the separated valve cores to the gripper system 1.2, awaiting gripping.

[0084] In the gripper system 1.2, after the valve core pushed by the cutting cylinder 1.12 arrives, the piston rod of the gripper cylinder 1.23 extends, and the gripper closes to grasp the valve core. At this time, the horizontal movement cylinder 1.21 and the vertical lifting cylinder 1.22 work together. The horizontal movement cylinder 1.21 drives the gripper cylinder 1.23 to move horizontally, and the vertical lifting cylinder 1.22 controls its vertical movement, moving the gripper cylinder 1.23 holding the valve core above the gripper 1.31 of the transfer system 1.3. After the gripper 1.31 of the transfer system 1.3 opens to grasp the valve core and then closes, the piston rod of the transfer cylinder 1.32 extends, pushing the gripper 1.31 and the valve core towards the valve core mounting gripper system 1.4. During this process, the detection sensor 1.33 continuously monitors the position of the valve core. If the position deviates, it controls the gripper 1.31 to open and throw the valve core into the waste box 1.34.

[0085] After the transfer system 1.3 transfers the valve core to the designated position, the lateral movement electric cylinder 1.43 of the valve core mounting gripper system 1.4 drives the valve core mounting gripper 1.45 to move to the output end of the transfer system 1.3. The lifting cylinder 1.41 extends, causing the valve core mounting gripper 1.45 to rise. The gripper position switching servo 1.44 adjusts the angle and position of the valve core mounting gripper 1.45 according to the product model and size. After adjustment, the valve core mounting gripper 1.45 grasps the valve core, the lateral movement electric cylinder 1.43 actuates again, moving the valve core mounting gripper 1.45 to the product installation position. Finally, the valve core mounting cylinder 1.41 retracts, installing the valve core onto the product.

[0086] In the wire feeding mechanism 1.9, the wire feeding servo 1.91 is powered on and starts, driving the wire drum 1.92 to rotate, thus feeding out the wire SMA on the wire drum 1.92. The wire winding wheel 1.93 guides the wire SMA, positioning it above the wire storage bin 1.81, where the wire SMA enters the wire storage bin 1.81. In the wire storage tensioning mechanism 1.8, the gravity hammer 1.82 pulls down the wire SMA under its own weight, applying a constant tension force to the wire SMA. The gravity hammer drop detection sensor 1.83 monitors the status of the gravity hammer 1.82 in real time; if the gravity hammer 1.82 falls, the sensor sends a signal. The lower limit sensor 1.84 and the upper limit sensor 1.85 detect the minimum and maximum heights of the gravity hammer 1.82, respectively. When the gravity hammer 1.82 reaches the position of the lower limit sensor 1.84, the wire feeding servo 1.91 starts feeding wire; when it reaches the position of the upper limit sensor 1.85, the wire feeding servo 1.91 stops feeding wire, thereby controlling the storage length of the metal wire SMA. The tension wheel detection device 1.87 detects the tension force of the metal wire SMA in real time, and the direction-changing winding wheel 1.86 adjusts the path of the metal wire SMA, working in conjunction with the tension wheel detection device 1.87.

[0087] When the threading mechanism 1.7 is threading the wire, the piston rod of the threading cylinder 1.71 extends, driving the needle 1.77 to pass through the assembly hole along the valve core axis. Driven by the threading cylinder 1.74, the wire feeding jaws 1.75 open to clamp the metal wire SMA. The threading cylinder 1.74 pushes the wire feeding jaws 1.75, pushing the metal wire SMA to the set length. Driven by the wire taking-up cylinder 1.72, the wire taking-up jaws 1.73 clamp the tail end of the metal wire SMA when it reaches the set length. The wire feeding jaws 1.75 and the wire taking-up jaws 1.73 open and close alternately, realizing the step-by-step conveying of the metal wire SMA. Driven by the tensioning wheel rotary cylinder 1.76, the tensioning wheel 1.78 adjusts the wheel surface angle to maintain the conveying tension of the metal wire SMA.

[0088] After the metal wire SMA is inserted into the valve core, the lever-type pressure amplification device of the crimping and shearing system 1.6 starts to work, cooperating with the threading mechanism 1.7 to crimp the metal wire SMA onto the product. After crimping is completed, the shearing mechanism actuates to cut the metal wire SMA, thus completing the entire assembly process of the memory metal wire SMA for the seat airbag control valve.

[0089] The above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model using the disclosed methods and techniques, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Therefore, all equivalent changes made based on the shape, structure, and principle of this utility model without departing from its technical solution should be covered within the protection scope of this utility model.

Claims

1. An automated assembly equipment for a seat airbag control valve using shape memory metal wire (SMA), characterized in that, include: Automatic valve core feeding system (1.1), which is used to sort and push valve cores; The gripper system (1.2) is located at the output end of the automatic valve core feeding system (1.1) and is used to receive the valve cores sorted and pushed by the automatic valve core feeding system (1.1) and to grip them in groups. The transfer system (1.3), which is located at the output end of the gripper system (1.2), is used to receive and transport the valve cores grasped in groups by the gripper system (1.2), and to verify whether the position of the valve cores is correct; A valve core mounting gripper system (1.4) is provided at the output end of the transfer system (1.3) for receiving the valve cores conveyed by the transfer system (1.3) and mounting the valve cores onto the product; A circular conveyor line (1.5) is connected between the valve core mounting gripper system (1.4) and the wire feeding, storage, needle threading and take-up system, for conveying products with valve cores to the wire feeding, storage, needle threading and take-up system. The wire feeding, storage, threading, and take-up system includes a wire feeding mechanism (1.9), a wire storage tensioning mechanism (1.8), a threading mechanism (1.7), and a press-fitting and shearing system (1.6). The wire storage tensioning mechanism (1.8) includes a wire storage drum (1.81) and a gravity hammer (1.82). The wire feeding mechanism (1.9) is used to feed shape memory metal wire (SMA) to the wire storage drum (1.81). The wire storage drum (1.81) pulls down the metal wire (SMA) through the gravity hammer (1.82) to apply a constant tension force to the metal wire (SMA). The threading mechanism (1.7) is used to lead out the metal wire (SMA) in the wire storage drum (1.81) and thread it into the square hole of the valve core, and straighten the metal wire (SMA). The press-fit and shearing system (1.6) includes a lever-type pressure amplification device and a scissor mechanism. The lever-type pressure amplification device is used to work with the threading mechanism (1.7) to press-fit the metal wire SMA onto the product, and the scissor mechanism is used to cut the metal wire SMA.

2. The automated assembly equipment for the memory metal wire SMA of the seat airbag control valve according to claim 1, characterized in that: The automatic valve core feeding system (1.1) includes a vibratory feeder (1.11). The output end of the vibratory feeder (1.11) is equipped with a baffle cylinder (1.13) and a cutting cylinder (1.12). The vibratory feeder (1.11) arranges the valve cores and then conveys them to the baffle cylinder (1.13) for separation. The cutting cylinder (1.12) pushes the separated valve cores to the gripper system (1.2).

3. The automated assembly equipment for the shape memory metal wire (SMA) of the seat airbag control valve according to claim 1, characterized in that: The gripper system (1.2) includes a transverse electric cylinder (1.21), an up-and-down lifting cylinder (1.22), and a gripper cylinder (1.23). The gripper cylinder (1.23) is located at the output end of the cutting cylinder (1.12) and is used to grip the valve core pushed by the cutting cylinder (1.12). The transverse electric cylinder (1.21) and the up-and-down lifting cylinder (1.22) work together to drive the gripper cylinder (1.23) to move to the transfer system (1.3).

4. The automated assembly equipment for the memory metal wire (SMA) of the seat airbag control valve according to claim 1, characterized in that: The transfer system (1.3) includes a gripper (1.31), which is located at the output end of the transfer system (1.3) and is used to pick up the valve core conveyed by the gripper cylinder (1.23). The gripper (1.31) is connected to the transfer cylinder (1.32), which is used to transfer the valve core held by the gripper (1.31) to the valve core mounting gripper system (1.4). The transfer system (1.3) is also equipped with a detection sensor (1.33) to confirm the correctness of the valve core position. If the position is deviated, the defective product is rejected through the waste box (1.34).

5. The automated assembly equipment for the shape memory metal wire (SMA) of the seat airbag control valve according to claim 1, characterized in that: The valve core mounting gripper system (1.4) includes a valve core mounting cylinder (1.41), a lifting blocking cylinder (1.42), a lateral movement electric cylinder (1.43), a gripper position switching servo (1.44), and a valve core mounting gripper (1.45). The lateral movement electric cylinder (1.43) drives the valve core mounting gripper (1.45) to move to the output end of the transfer system (1.3), and adjusts the position of the valve core mounting gripper (1.45) through the lifting cylinder (1.41) and the gripper position switching servo (1.44) to install the valve core onto the product.

6. The automated assembly equipment for the shape memory metal wire (SMA) of the seat airbag control valve according to claim 1, characterized in that: The wire feeding mechanism (1.9) includes a wire feeding servo (1.91), a wire drum (1.92), and a wire winding wheel (1.93). The wire feeding servo (1.91) is used to drive the wire drum (1.92) to rotate so that the wire SMA on the wire drum (1.92) is fed out. The wire winding wheel (1.93) is used to restrict the feeding position of the wire SMA above the wire storage drum (1.81).

7. The automated assembly equipment for the shape memory metal wire (SMA) of the seat airbag control valve according to claim 1, characterized in that: The wire tensioning mechanism (1.8) further includes: A gravity hammer drop detection sensor (1.83) is used to monitor whether the gravity hammer (1.82) has fallen; The lower limit sensor (1.84) and the upper limit sensor (1.85) are used to detect the minimum and maximum height of the gravity hammer (1.82) to control the length of the wire SMA. Tensioner detection device (1.87), used to detect the tension force of SMA wire; and A reversing winding wheel (1.86) is used to adjust the wire SMA path to cooperate with the tensioner detection device (1.87).

8. The automated assembly equipment for the memory metal wire SMA of the seat airbag control valve according to claim 1, characterized in that: The threading mechanism (1.7) includes a needle-threading cylinder (1.71), a take-up cylinder (1.72), a take-up clamp (1.73), a wire-feeding cylinder (1.74), a wire-feeding clamp (1.75), a tensioning wheel rotating cylinder (1.76), a needle (1.77), and a tensioning wheel (1.78). The piston rod of the needle-threading cylinder (1.71) is fixed to the end of the needle (1.77) to drive the needle (1.77) to pass through the assembly hole along the valve core axis. The wire-feeding clamp (1.75) and the wire-feeding cylinder... The cylinder (1.74) is linked to clamp the metal wire SMA after the needle (1.77) passes through the assembly hole and pushes it to the set length. The take-up clamp (1.73) is linked to the take-up cylinder (1.72) to clamp the tail end of the metal wire SMA when it reaches the set length, and alternately opens and closes with the wire feeding clamp (1.75) to step-feed the metal wire SMA. The tensioning wheel (1.78) adjusts the wheel surface angle through the tensioning wheel rotation cylinder (1.76) to maintain the conveying tension of the metal wire SMA.

Images