A type of blind rivet assembly machine

Abstract

This invention discloses a blind rivet assembly machine, comprising a fixed part and a rotating part rotatably connected by ball bearings and a rotating sealing device. The fixed part is mainly used to fix the upper and lower ring dies, with the lower surface of the upper ring die and the upper surface of the lower ring die being consistent track surfaces. The rotating part includes a reversing air valve, an assembly device, and a rotating body. The ball bearings are located in the arc-shaped grooves of the fixed plate and the turntable. The rotating sealing device rotatably connects the fixed plate and support pipe of the fixed part, as well as the reversing air valve of the rotating part, compressing air through a lubricating oil seal while simultaneously providing lubricating oil to the rotating components. The reversing air valve rotates under the constraint of the upper and lower track surfaces, controlling the extension and retraction of the cylinder rod through the up and down movement of the valve plate. The assembly device is installed in the annular groove space formed by the turntable, the rotating cylinder, and the upper plate, and completes the assembly of the blind rivet under the action of the cylinder extension and retraction. This invention improves assembly efficiency and provides good rotating sealing and lubrication effects.

Description

Technical Field

[0001] This invention is applied to the field of blind rivet production, and relates to the assembly of the rivet core and the cap of the blind rivet, specifically a high-efficiency assembly machine for assembling the rivet core and the cap. Background Technology

[0002] Blind rivets are a type of rivet used for single-sided riveting, achieved using a specialized tool called a rivet gun (manual, electric, or pneumatic). See attached image for blind rivet product information. Figure 1 As shown, the assembly includes a rivet core 1 and a pipe cap 2. The standard diameter section d of the pipe cap 2 is inserted into the riveting hole. Using a rivet gun, the rivet core 1 is pulled to the left. The arc-shaped top of the rivet core forces the pipe cap to undergo plastic deformation, forming a riveting joint. Subsequently, the rivet core breaks, completing the riveting process. To increase the service life of the riveting joint, the pipe cap should be made of a corrosion-resistant material, such as 304 stainless steel or aluminum alloy. The rivet core provides the tensile strength for the deformation of the pipe cap and should preferably be made of low-carbon steel with a strength greater than that of 304 stainless steel and aluminum alloy, such as 08A or 10A.

[0003] The assembly of the core and cap of a blind rivet was initially done manually. However, due to rising labor costs, assembly machines were later developed. Most blind rivet assembly machines are horizontal. Publication number CN210306582U discloses an improved blind rivet assembly machine that assembles the core and cap horizontally. This patent adds an assembly positioning mechanism to the original blind rivet assembly machine, using a spring to ensure the core is properly positioned. Publication number CN214418127U discloses another improved blind rivet assembly machine, also horizontally oriented. Multiple grooves are formed on the rotating wheel, with a push rod slidably connected within each groove. An oil drip box is fixedly connected to an oil drip pipe, the opening of which faces the push rod at the top of the rotating wheel. This facilitates lubrication at the contact surface between the push rod and the rotating wheel, ensuring smooth sliding of the push rod. The horizontal assembly machine can achieve continuous production and assembly of blind rivets, but it only feeds material from the top and sides of the drum and discharges material from the bottom of the drum. Only half of the drum is used for assembling pipe caps and rivet cores, while the other half rotates back empty, so the production efficiency is not fully utilized.

[0004] CN110695651B discloses an automatic assembly machine for blind rivets. Two parallel vertical power units are installed on the front sides of the machine frame, each with two horizontally fixed rotary motors. Vibrators are connected to each of the two rotary motors. An assembly plate is fixed to the two vibrators on both sides. The assembly plate has multiple limiting holes for the rivet body and rivet core. An anti-detachment device is fixed to the rear frame plate and includes an anti-detachment plate for fixing the rivet body on the assembly plate. The limiting device and the pressing plate are both located at the top of the machine frame and can move up and down. A pressing platform is located below the center of the assembly plate at the bottom of the machine frame. The rivet body and rivet core are aligned and pressed together, allowing for the simultaneous batch assembly of separated rivet bodies and cores. While the assembly of blind rivet cores and caps is automatic, the feeding of rivet cores and caps cannot be coordinated with a vibratory feeder, requiring cyclical operation and limiting production efficiency.

[0005] CN211683571U discloses a rotary rivet and waterproof sleeve assembly device. This device includes a first rotary table, a second rotary table, and a lifting slide. The first rotary table is rotatably mounted on a bracket and has multiple sleeve positions along its circumference for placing waterproof sleeves. The second rotary table is rotatably mounted on the bracket and synchronized with the first rotary table. Multiple floating components are circumferentially arranged on the second rotary table, each floating component having a rivet position for placing a blind rivet, with each rivet position corresponding to a sleeve position. The lifting slide is fixedly mounted on the bracket and located below the floating components. The floating components are slidably connected to the lifting slide and can rise and fall relative to the second rotary table. When the floating component rotates with the second rotary table to the top of the lifting slide, the blind rivet is inserted into the waterproof sleeve. This device has a high degree of automation and can complete the assembly of batches of blind rivets and waterproof sleeves in a short time, greatly improving the assembly efficiency of blind rivets and waterproof sleeves. The turntable of this device is horizontal, and rivets and rubber sleeves are assembled using the upper and lower jacking slides. For small-sized blind rivets, the diameter of the turntable is relatively small, usually around Φ400mm. The height of the jacking slides is limited and should be around 10mm. Otherwise, a large lifting angle will cause the rising and falling of the floating components to generate a large inertial impact force, affecting the safe operation of the device. Summary of the Invention

[0006] The technical problem solved by this invention is to provide a core-pulling rivet assembly machine that works in conjunction with a vibratory feeder for rivet cores and pipe caps. The machine assembles vertically while rotating, performing two assemblies per rotation and assembling multiple parts at once, thereby improving production efficiency.

[0007] The technical solution adopted in this invention is as follows: A blind rivet assembly machine includes a fixed part and a horizontally rotating part, which are rotatably connected by ball bearings and a rotating sealing device. The fixed part includes a fixed plate, a lower ring mold, an upper ring mold, a support tube, and an upper bracket. The support tube is fixedly connected to the center of the fixed plate, the upper bracket is fixedly connected to the upper part of the support tube, and the upper ring mold is fixedly connected to the lower end of the upper bracket. The lower ring mold is fixed on the fixed plate and corresponds to the upper ring mold. The lower surface of the upper ring mold and the upper surface of the lower ring mold are both track surfaces, and the two track surfaces are consistent. The rotating part includes a turntable, a reversing air valve, an assembly device, an upper plate, and a rotating cylinder. The reversing air valve rotates under the constraint of the upper and lower track surfaces; the ball bearings are located in the arc-shaped grooves of the fixed plate and the turntable; the rotating sealing device rotatably connects the fixed plate and the support tube of the fixed part, as well as the reversing air valve of the rotating part. The turntable is annular, with a rotating cylinder fixed to its upper surface. An upper plate is fixed to the upper part of the outer surface of the rotating cylinder. An assembly device is installed within the annular groove formed by the turntable, rotating cylinder, and upper plate. The assembly device, evenly distributed around the circumference of the turntable, includes a fan-shaped plate, a vertical plate, small wheels, a support, a rotating rod, and a support plate. A cylinder rod is fixedly connected to the lower surface of the fan-shaped plate, and a groove is machined into the circumferential edge of the upper surface. This groove corresponds to the rivet joint of the pipe cap and is used to position the pipe cap. A vertical plate is fixedly installed inside the fan-shaped plate. The top of the vertical plate is an arc surface, and the inner side is a sloped surface. The arc surface and sloped surface mate with the small wheels. The small wheels are rotatably connected to the middle of the rotating rod; the inner end of the rotating rod is hinged to the support, which is fixedly installed on the rotating cylinder. A groove for positioning the nail core is machined at the outer end of the rotating rod, and a lower magnet is fixedly installed on the upper surface of the outer end of the rotating rod. An upper groove is machined on the lower surface of the outer circumference of the upper plate, and an upper magnet is fixedly installed in the upper groove. The upper groove corresponds to the shape and size of the nail core cap and, together with the upper magnet, positions the nail core cap. A support plate is installed on the lower surface of the upper groove, and the support plate has a groove machined on it that corresponds to the outer arc of the straight section of the nail core. When the magnetic attraction is insufficient to fix the nail core, the support plate can be used to suspend the nail core.

[0008] Furthermore, a cover is placed on the upper support, which serves as a safety protection feature. Openings are machined on both symmetrical sides of the cover, located at the loading and unloading stations of the assembly device, facilitating the loading of pipe caps and rivets, as well as the unloading of pull rivets.

[0009] Furthermore, the rotating sealing device includes an air chamber ring plate, an annular groove, a rotating cylindrical section, an annular top plate, and a fixed cylindrical section. The annular top plate is installed on top of the air chamber ring plate and, together with the fixed plate, support pipe, and air chamber ring plate, forms a sealed air chamber, which is connected to the support pipe through an air hole. The air chamber ring plate is connected to the air inlet pipe of the reversing air valve; a gap is maintained between the bottom of the air chamber ring plate and the upper surface of the fixed plate, and a fixed cylindrical section is fixedly connected to the fixed plate on the outside of the air chamber ring plate. A gap is maintained between the annular top plate and the outer surface of the support pipe, and an annular groove and a rotating cylindrical section are designed below this gap. The annular groove is fixed to the outer surface of the support pipe, and the rotating cylindrical section is fixed to the lower surface of the annular top plate, with the rotating cylindrical section inserted into the annular groove. The annular groove is connected to a micro oil pump in the oil tank through an oil pipe, and the lubricating oil provided by the micro oil pump leaks through the gap between the annular top plate and the support pipe, as well as the gap at the bottom of the air chamber ring plate, to form an oil seal; a gap is maintained between the annular top plate and the inner surface of the upper ring mold. The aforementioned gaps can be sealed with a sealing ring, which creates the gaps through rotation and friction.

[0010] Furthermore, the reversing valve includes a valve body, a lower outlet pipe, an upper outlet pipe, a valve plate, an upper inlet pipe, and a lower inlet pipe. The valve body is fixedly connected to the turntable; the valve plate is a vertical flat plate, installed in the middle of the valve body, and slidably sealed with the valve body. An upper inlet, an outlet, and a lower inlet are machined on the valve plate. The lower outlet pipe and the upper outlet pipe are located on one side of the valve plate and communicate with the cylinder. The upper inlet pipe and the lower inlet pipe are located on the other side of the valve plate and communicate with the rotating sealing device. The valve plate moves up and down under the constraint of the upper and lower track surfaces. To reduce the friction of the valve plate, upper and lower rollers are installed at both ends of the valve plate. The up and down movement of the valve plate changes the gas flow direction, thereby controlling the extension and retraction of the cylinder.

[0011] Furthermore, the oil tank is located below the fixed plate. The rotation drive device for the turntable is designed between the oil tank and the cylinder.

[0012] The beneficial effects of this invention are: 1) Significantly improved assembly efficiency of the blind rivet. The assembly stroke of the tube cap and rivet core is changed from horizontal assembly to vertical assembly. Each assembly device rotates once to assemble two products, and the assembly device can assemble 2-3 products at a time, further improving assembly production efficiency. 2) The small stroke of the reversing air valve plate controls the large stroke of the cylinder extension and retraction. The valve plate of the reversing air valve controls the flow direction of compressed air, thereby controlling the vertical extension and retraction of the cylinder. 3) Utilizing a rotating sealing device with lubricating oil seals, the upper and lower ring dies of the assembly machine are fixed, while the middle reversing air valve rotates. 4) Enhanced lubrication. The lubricating oil provides lubrication to all rotating parts inside the assembly machine while providing oil seals, eliminating the need for special lubrication maintenance and ensuring long-term operation of the equipment. 5) Utilizing the different magnetic responses of the rivet core and tube cap, different feeding and positioning methods are adopted to ensure rapid feeding and accurate positioning. Attached Figure Description

[0013] Figure 1 Product image of a blind rivet;

[0014] Figure 2 This is a schematic diagram of the main structure of Example 1, and also... Figure 2 A schematic diagram of the BB cross-sectional structure;

[0015] Figure 3 for Figure 2 A schematic diagram of the AA cross-sectional structure;

[0016] Figure 4 This is a schematic diagram of the assembly device's operation process;

[0017] Figure 5 for Figure 4 Schematic diagram of the DD cross section;

[0018] Figure 6 for Figure 4 Schematic diagram of the CC section;

[0019] Figure 7 and Figure 8 These are schematic diagrams showing different working states of the reversing air valve;

[0020] Figure 9 for Figure 1 A partial schematic diagram, which is also a structural schematic diagram of the rotating sealing device;

[0021] Figure 10 This is a schematic diagram of the main structure of Example 2;

[0022] Figure 11 for Figure 10 A top-down view;

[0023] Among them: 1-nail core, 2-pipe cap, 3-turntable, 4-cylinder, 5-ball bearing, 6-reversing air valve, 7-fixed plate, 8-micro oil pump, 9-compressed air inlet, 10-rotary sealing device, 11-lower ring mold, 12-assembly device, 13-upper plate, 14-rotating cylinder, 15-upper ring mold, 16-support pipe, 17-upper bracket, 18-cover, 19-opening;

[0024] 61-Valve body, 62-Lower exhaust pipe, 63-Upper exhaust pipe, 64-Valve plate, 65-Upper air inlet, 66-Upper air inlet pipe, 67-Exhaust port, 68-Lower air inlet pipe, 69-Lower air inlet;

[0025] 101-Air chamber ring plate, 102-Air hole, 103-Annular groove, 104-Rotating cylindrical section, 105-Sealing ring, 106-Annular top plate, 107-Upper roller, 108-Oil tank, 109-Lower roller, 110-Fixed cylindrical section;

[0026] 121-Fan-shaped plate, 122-Upright plate, 123-Small wheel, 124-Lower magnet, 125-Support, 126-Rotating rod, 127-Support plate, 128-Upper magnet. Detailed Implementation

[0027] For a clean drawing, the reinforcing ribs and reinforcing struts, among other accessories, are not shown in the attached drawing. Figure 1 Only two symmetrical assembly devices are shown; the others are not. In the following descriptions of inner and outer distances relative to the center of rotation, inner refers to the distance from the center that is relatively closer, and outer refers to the distance from the center that is relatively farther.

[0028] The assembly machine is designed based on the following principles: 1) The assembly device rotates horizontally, cooperating with the vibratory feeder for nail cores and pipe caps to achieve automatic feeding. One assembly cycle is completed in half a turn, and two assemblies can be completed in one full rotation of the turntable, doubling production efficiency. 2) The assembly device moves vertically relative to each other, enabling the vertical assembly of nail cores and pipe caps. 3) A specialized positioning design ensures smooth assembly. Example 1

[0029] The assembly machine structure of this invention is shown in the appendix. Figure 2 and attached Figure 3 As shown, it includes a fixed part (attached). Figure 2 (45° section) and rotating part (attached) Figure 2 (The 135° section is shown in the attached diagram). The fixed part includes a fixed plate 7, a lower ring mold 11, an upper ring mold 15, a support pipe 16, and an upper bracket 17. The fixed plate 7 is supported by a fixed bracket (not shown in the attached diagram). The support pipe 16 is fixedly connected to the center of the fixed plate 7. The upper bracket 17 is fixedly connected to the upper part of the support pipe 16. The lower end of the upper bracket 17 is fixedly connected to the upper ring mold 15. The lower ring mold 11 is fixed on the fixed plate 7, and its position corresponds to that of the upper ring mold 15. The lower surface of the upper ring mold 15 and the upper surface of the lower ring mold 11 are track surfaces, and the track surfaces of the upper and lower ring molds are consistent. The valve plate 64 of the reversing air valve 6 is located between the track surfaces of the upper and lower ring molds and moves up and down under the constraint of the track surfaces of the upper and lower ring molds. Below the fixed plate 7, an oil tank 108 is fixed, and the oil tank 108 collects the lubricating oil falling from the fixed plate 7.

[0030] The rotating part is rotatably connected to the fixed part via ball bearings 5 ​​and a rotating sealing device 10. This rotating part includes a turntable 3, a reversing valve 6, an assembly device 12, an upper plate 13, and a rotating cylinder 14. The turntable 3, upper plate 13, and rotating cylinder 14 constitute the main rotating component, and the reversing valve 6 and assembly device 12 are fixedly mounted on the main rotating component. The ball bearings 5 ​​are located between the turntable 3 and the fixed plate 7, rolling within arc-shaped grooves on the lower surface of the turntable 3 and the upper surface of the fixed plate 7. The turntable 3 is annular, with the rotating cylinder 14 fixed to its upper surface, and the upper plate 13 fixed to the upper part of the outer surface of the rotating cylinder 14. The assembly device 12 is installed within the annular groove space formed by the turntable 3, rotating cylinder 14, and upper plate 13, and the assembly devices 12 are evenly distributed around the circumference of the turntable 3. In this embodiment, there are a total of 30 assembly devices, arranged in groups of three, as shown in the attached diagram. Figure 3 As shown. The assembly device 12 includes a sector plate 121, a vertical plate 122, small wheels 123, a support 125, a rotating rod 126, a support plate 127, etc., as shown in the attached diagram. Figure 4 As shown. Three assembly devices are mounted on a sector plate 121, which consists of ten centrally symmetrical pieces. The lower surface of the sector plate 121 is fixedly connected to the cylinder rod of cylinder 4. The up-and-down movement of the cylinder rod drives the sector plate 121 to move up and down. Three evenly spaced grooves are machined on the circumferential edge of the upper surface of each sector plate 121. These grooves correspond to the rivet joints of the pipe cap, and the fit between these grooves and the rivet joints is used to position the pipe cap. (See attached diagram.) Figure 3 As shown in the enlarged view, the pipe cap slides down from the pipe cap feeding trough into the lower groove. During the rotation of the sector plate 121, the arc plate of the feeding trough pushes the pipe cap into the lower groove. The upright plate 122 is fixedly installed on the inner side of the sector plate, with a rounded top and an inclined inner surface. The rounded surface and the inclined surface cooperate with the small wheel 123, which is installed in the middle of the rotating rod 126 and rotatably connected to the rotating rod 126. The inner end of the rotating rod 126 is hinged to the support 125 and can rotate around the connecting shaft on the support 125. The support 125 is fixedly installed on the rotating cylinder 14. The lower magnet 124 is fixedly installed on the upper surface of the outer end of the rotating rod 126. The lower magnet 124 can magnetically attract the lower part of the nail core. The nail core is positioned by the groove at the outer end of the rotating rod, as shown in the attached figure. Figure 5 As shown, the groove size corresponds to the outer arc of the straight section of the nail core, ensuring the perpendicularity of the nail core. The lower surface of the outer circumference of the upper plate 13 is machined with an upper groove, as shown in the attached diagram. Figure 6 As shown, an upper magnet 128 is fixedly installed in the upper groove, and a support plate 127 is installed on the lower surface of the upper groove. The upper groove corresponds to the shape and size of the top cap of the nail core. The upper magnet 128 magnetically attracts and positions the top cap, and together with the lower magnet 124, ensures the perpendicularity of the nail core. The support plate 127 is machined with a groove corresponding to the outer arc of the straight section of the nail core. When the upper and lower magnets are insufficient to fix the nail core, the support plate 127 can be used to suspend the nail core, and the upper groove, the upper magnet 128, and the groove at the outer end of the rotating rod can be used to position the nail core. Another function of the magnet is to quickly magnetically attract the nail core into the assembly device without using an arc-shaped plate similar to a pipe cap feeding groove.

[0031] As shown in the attached diagram, the assembly is done with pop rivets. Figure 4 As shown, when the upright plate 122 is at position E, it receives the nail core and tube cap conveyed by the feed chute. The turntable rotates, and the cylinder 4 receives compressed air from the reversing air valve 6 to lift it. When the upright plate reaches position F, the arc surface of the upright plate contacts the small wheel 123. At this time, the tube cap has been fitted into the lower end of the nail core. The cylinder continues to lift, and the rotating rod 126 rotates upward around the hinge shaft on the support 125, reaching position G. The small wheel contacts the inclined surface, and the lower magnet 124 and the groove at the outer end of the rotating rod disengage from the straight section of the nail core. At this time, the nail core is positioned by the upper groove at the upper end and the tube cap at the lower end, continuing to maintain a vertical state. When the cylinder lifts to position H, the assembly of the tube cap and nail core is completed. Subsequently, the cylinder rod moves downward and retracts under the control of the reversing air valve 6, and the rotating rod 126 rotates back to its original position under its own weight. Finally, the rotating rod 126 falls back onto the rib plate of the support 125, where the rib plate fixes the rotating rod 126 in a horizontal position. The sector plate 121 descends to prepare for receiving the next batch of three tube caps. The assembled blind rivets are peeled from their upper grooves by the unloading rod, ready to receive the next rivet core. The tube cap and rivet core have a clearance fit, but due to manufacturing errors or straightness discrepancies, the friction between them can overcome the weight of the tube cap. If, during the lifting of the tube cap, the friction between it and the rivet core exceeds the magnetic attraction of the rivet core, the rivet core rises, is stopped by the top surface of the upper groove, and assembly continues.

[0032] The working principle of the reversing valve 6 is as follows: Figure 7 and attached Figure 8 As shown in the attached diagram, the arrows indicate the direction of compressed air flow. The reversing valve includes a valve body 61, a lower outlet pipe 62, an upper outlet pipe 63, a valve plate 64, an upper inlet port 65, an upper inlet pipe 66, an outlet port 67, a lower inlet pipe 68, and a lower inlet port 69. The valve plate 64 is a vertical flat plate that slides and seals with the valve body 61. The upper inlet port 65, outlet port 67, and lower inlet port 69 are machined on this valve plate. The lower outlet pipe 62 and upper outlet pipe 63, as well as the upper inlet pipe 66 and lower inlet pipe 68, are respectively designed on the valve body on both sides of the valve plate. When the valve plate 64 rises, as shown in the attached diagram... Figure 7 As shown, compressed air enters the valve body through the lower inlet pipe 68, flows out of the valve body through the lower inlet port 69 and the lower outlet pipe 62, and is fed into the cylinder. The cylinder piston drives the cylinder rod to rise, and the compressed air in the cylinder enters the valve body through the upper outlet pipe 63 and flows out through the outlet port 67, completing the rising action of the cylinder. When the valve plate 64 descends, as shown in the attached diagram... Figure 8As shown, compressed air enters the valve body through the upper inlet pipe 66, flows out of the valve body through the upper inlet port 65 and the upper outlet pipe 63, and is fed into the cylinder. The cylinder piston drives the cylinder rod to descend, and the compressed air in the cylinder enters the valve body through the lower outlet pipe 62 and flows out through the outlet port 67, completing the descent action of the cylinder. The inlet pipe of the reversing valve is fixedly connected to the rotating sealing device 10, the valve body is fixedly connected to the turntable 3, and the outlet pipe is fixedly connected to the cylinder. When the reversing valve rotates, the valve body remains horizontal, while the valve plate moves up and down under the constraint of the track surfaces of the upper and lower ring dies. By changing the direction of compressed air flow through the short stroke of the valve plate of the reversing valve, the long stroke of the cylinder rod is controlled, which can greatly reduce the slope of the track surfaces of the upper and lower ring dies, which is beneficial to the smooth operation of the equipment. To reduce the friction between the valve plate and the track surfaces of the upper and lower ring dies, rollers 107 and lower rollers 109 are installed at the top and bottom ends of the valve plate, changing the sliding friction to rolling friction with lower friction.

[0033] The structure of the rotating sealing device 10 is shown in the attached figure. Figure 9As shown, the structure includes an air chamber ring plate 101, an annular groove 103, a rotating cylindrical section 104, an annular top plate 106, and a fixed cylindrical section 110. The air chamber ring plate 101 is fixedly connected to the inlet pipes of all the reversing air valves 6. When the turntable rotates, the reversing air valves drive the air chamber ring plate 101 to rotate. The annular top plate 106 is installed on top of the air chamber ring plate 101. The fixed plate 7, the support pipe 16, the annular top plate 106, and the air chamber ring plate 101 constitute a sealed air chamber. This sealed air chamber is connected to the support pipe 16 through an air hole 102. An air inlet 9 is provided at the bottom of the support pipe 16. Compressed air enters the support pipe 16 through the air inlet 9, enters the sealed air chamber through the air hole 102, enters the reversing air valve through the inlet pipe fixedly connected to the sealed air chamber, and enters the cylinder through the reversing air valve. The reversing air valve controls the movement of the cylinder. The bottom of the air chamber ring plate 101 is sealed to the fixed plate 7 by a sealing ring 105. A fixed cylindrical section 110 is fixedly connected to the outside of the air chamber ring plate 101. The outer surface of the ring top plate 106 and the support tube 16 are sealed by a sealing ring 105, leaving a gap with the inner wall of the upper ring mold 15 to prevent the ring top plate 106 from colliding with the upper ring mold 15 when rotating. Inside the sealed air chamber, below the sealing ring 105 between the ring top plate 106 and the support tube 16, an annular groove 103 and a rotating cylindrical section 104 are designed. The annular groove 103 is fixed to the outer surface of the support tube 16, and the rotating cylindrical section 104 is fixed to the lower surface of the ring top plate 106 and rotates with the air chamber ring plate 101. The rotating cylindrical section 104 is inserted into the annular groove 103. The annular groove 103 is connected to a micro oil pump 8 through an oil pipe installed in the support tube 16. The micro oil pump 8 is fixed in the oil tank 108 and can provide a certain pressure and a small amount of lubricating oil. When the assembly machine is rotating, the micro oil pump 8 supplies lubricating oil to the annular groove 103 through the oil pipe. The lubricating oil in the annular groove seals the compressed air in the air chamber using a liquid seal method. Due to sliding friction wear, the sealing ring 105 between the annular top plate 106 and the support pipe 16 forms gaps, and its sealing effect will inevitably gradually deteriorate. Thus, lubricating oil can leak from the gap between the sealing ring 105 and the outer surface of the support pipe 16. The leaked lubricating oil flows out from the upper surface of the annular top plate 106 under the action of centrifugal force, and then falls onto the upper roller 107 through the gap between the annular top plate 106 and the upper annular mold 15, thus lubricating the upper roller 107. The lubricating oil on the upper roller 107 continues to fall, which can lubricate the up and down sliding of the valve plate 64 of the reversing air valve and reduce the friction between the valve plate and the valve body. Excess lubricating oil may flow to the inner wall of the rotating drum 14 under the action of centrifugal force, and then flow to the fixed plate 7 through the upper surface of the turntable 3. Except for a small portion that leaks through the sealing ring, most of the lubricating oil in the annular groove overflows through the annular groove and flows into the bottom of the air chamber. The sealing ring 105 at the bottom of the air chamber also forms gaps due to sliding friction wear, resulting in a poor sealing effect. Under the pressure of compressed air, the lubricating oil in the air chamber is forced out from the gap between the sealing ring 105 and the upper surface of the fixed plate 7. In this way, a liquid seal is also formed at the bottom of the air chamber, with only the leakage of lubricating oil under air pressure and no gas leakage.Leaking lubricating oil overflows from the fixed cylindrical section 110 and flows outward on the outer surface of the fixed plate. When lubricating oil overflows from the lower ring die 11, it lubricates the lower roller 109. The overflowing lubricating oil continues to flow outward on the upper surface of the fixed plate 7, lubricating the ball bearings 5. Excess lubricating oil flows into the oil tank 108 at the bottom of the fixed plate, thus forming a working cycle of lubricating oil. At the same time, the compressed air in the air chamber carries the lubricating oil falling in the air chamber into the valve body, forming an oil-air mixture. This mixture enters the cylinder through the reversing air valve, lubricating the cylinder piston. Part of the oil-air mixture is discharged through the outlet 67 of the reversing air valve. The lubricating oil flows through the valve body and the lower roller to the upper surface of the fixed plate, mixing with the lubricating oil overflowing from the fixed cylindrical section 110. If the top of the rotating drum 14 is covered with a cover plate, the entire lubricating oil system operates in a relatively closed environment. Only the upper edge of the oil tank side plate and the lower surface of the rotating plate are separated, preventing the lubricating oil from being contaminated by dust in the air, and the equipment appearance remains free of oil stains. The circulation of lubricating oil can completely seal the air chamber and eliminate the need for additional lubrication and maintenance of the equipment's moving parts.

[0034] It should be noted that: 1) If the sealing ring is leak-proof, the micro oil pump should not be started, because the lubricating oil cannot flow back to the oil tank. Alternatively, the sealing ring can be omitted, and the mating gap can be machined directly. The main purpose of using the sealing ring is to utilize sliding friction to naturally form a tiny gap at the sealing ring location, controlling only the flow of lubricating oil without any gas leakage; 2) The lubricating oil level in the air chamber must not exceed the lowest air inlet pipe of the reversing valve to prevent lubricating oil from entering the reversing valve or cylinder, causing airflow obstruction.

[0035] The rotary drive mechanism is located between the oil tank and the cylinder. It can be driven by a friction wheel or a sprocket, and this part is an application of existing technology, not shown in the attached drawings. The rotary speed is unrelated to the assembly of the cap and nail core; it only determines the assembly efficiency. Whether the rotary table rotates and whether the valve plate and cylinder rod move up and down determine the assembly action. Therefore, variations in the rotary speed do not affect the assembly of the cap and nail core. The choice of drive mechanism is not the main focus of this application. Example 2

[0036] In Embodiment 1, the top of the rotating drum 14 is covered with a cover plate. Therefore, during assembly machine operation, the drum is rotating on all sides and at the top, which is detrimental to safe production. For this reason, in this embodiment, a cover 18 is placed on the upper support 17 of the assembly machine, as shown in the attached diagram. Figure 10 and attached Figure 11 As shown. The cover 18 covers the rotating parts of the assembly machine, which can prevent safety hazards caused by falling objects and accidental contact with the rotating parts. On both sides of the cover 18, there are openings 19. These openings 19 are located at the loading and unloading stations, which facilitates the loading of pipe caps and nail cores, as well as the unloading of the core-pulling rivets after assembly.

[0037] Cover 18 can replace the cover plate on the top of the drum, and the lubrication system remains in a relatively closed environment during operation. When slowly debugging the main unit, the cover can be removed to check the internal operating status of the assembly machine.

[0038] The assembly devices installed on the sector plate 121 are not limited to three in a group; they can also be two in a group, or a single assembly device can be installed, depending on the production rhythm of the preceding process.

[0039] Compared with existing horizontal assembly machines, this assembly machine has the following advantages:

[0040] 1) The assembly efficiency of blind rivets is greatly improved. The assembly stroke of the cap and rivet core has been changed from vertical rotation to horizontal rotation to vertical assembly. Each assembly device completes two assembly cycles in one rotation, and the assembly device can assemble 2-3 products at a time, which greatly improves the assembly production efficiency.

[0041] 2) Utilizing the different magnetic responses of nail cores and tube caps, different feeding and positioning methods are employed to ensure rapid feeding and accurate positioning. 304 stainless steel or aluminum alloy tube caps do not react to magnets; the curved plate of the feeding chute assists in feeding, and the lower groove on the fan-shaped plate is used for positioning. Low-carbon steel nail cores can be attracted to magnets; magnetic nail core feeding is used, and the upper groove, upper magnet, and groove at the outer end of the rotating rod are used for positioning the nail core, ensuring the vertical positioning and relative fixation of long nail cores.

[0042] 3) Use a small stroke to control a large stroke. After the pop rivet is installed, as shown in the attached... Figure 1 As shown, the standard specifies an exposed length of 25mm or 27mm for the nail core and a standard diameter section length of 6-25mm for the cap. This means that when the cap is inserted into the nail core for assembly, the cap's stroke should be no less than 35-55mm, resulting in a relatively long assembly stroke. The valve plate's vertical stroke, however, can be controlled within 10mm. The long stroke of the cylinder is used for assembling the nail core and cap, while the short stroke of the reversing valve plate controls the flow of compressed air, thereby controlling the cylinder's vertical movement.

[0043] 4) Achieve a fixed connection between the upper and lower ring dies of the assembly machine, with the intermediate reversing air valve rotating to deliver air. The up-and-down movement of the reversing air valve plate is controlled by the track surfaces of the upper and lower ring dies. The valve plate rotates within the space of the upper and lower ring dies, so the upper and lower ring dies must be fixed to allow the intermediate valve plate to move up and down while rotating. If a central shaft rotating air delivery pipe is used in the middle, it can seal the air delivery to the rotating cylinder, but the upper and lower ring dies need to be fixed separately, and the upper ring die needs to be fixed with a bracket on the outside of the assembly machine, increasing the difficulty of design, manufacturing, and assembly. If the upper and lower non-rotating parts are fixedly connected as one unit by a fixed central shaft, a good rotational seal is required to deliver stable air pressure to the rotating cylinder.

[0044] 5) A rotating hydraulic seal with lubricating oil is used to ensure stable air supply to the cylinder. Utilizing the principle of communicating vessels, a rotating hydraulic seal with lubricating oil is used to ensure that compressed air does not leak out, achieving a good rotating seal and serving the purpose of connecting the upper and lower fixed components and supplying compressed air to the rotating cylinder.

[0045] 6) Enhanced lubrication. In the near-enclosed space, a lubrication system is used to ensure good rotation and sealing of compressed air while providing lubrication to all rotating parts inside the assembly machine. No special lubrication maintenance is required, which can ensure long-term operation of the equipment.

[0046] 7) Utilize gap leakage to control the flow of lubricating oil, maintain oil pressure and compressed air pressure, and ensure sealing performance.

[0047] 8) The lubricating oil system is in a relatively closed environment, the lubricating oil does not affect the appearance of the equipment, and there is no environmental pollution from oil mist.

Claims

1. A blind rivet assembly machine, comprising a fixed part and a rotating part, characterized in that: The fixed part and the rotating part are rotatably connected by a ball bearing (5) and a rotating sealing device (10); The fixed part includes a fixed plate (7), a lower ring mold (11), an upper ring mold (15), a support tube (16), and an upper bracket (17). The rotating part rotates horizontally and includes a turntable (3), a reversing air valve (6), an assembly device (12), an upper plate (13), and a rotating drum (14). The ball (5) is located in the arc-shaped groove of the fixed plate (7) and the turntable (3); the rotating sealing device (10) rotatably connects the fixed plate (7) and the support tube (16) of the fixed part, as well as the reversing air valve (6) of the rotating part. The turntable (3) is annular, with a rotating cylinder (14) fixed on its upper surface. An upper plate (13) is fixed on the upper part of the outer surface of the rotating cylinder (14). An assembly device (12) is installed in the annular groove space formed by the turntable (3), the rotating cylinder (14) and the upper plate (13). The assembly device (12) is evenly distributed around the circumference of the turntable (3), including a fan-shaped plate (121), a vertical plate (122), a small wheel (123), a support (125), a rotating rod (126), and a support plate (127); the lower surface of the fan-shaped plate (121) is fixedly connected to the cylinder rod, and the circumferential edge of the upper surface is machined with a groove, which corresponds to the rivet joint of the pipe cap and is used to position the pipe cap; the vertical plate (122) is fixedly installed on the inner side of the fan-shaped plate (121), the top of the vertical plate (122) is an arc surface, and the inner side is a slope, the arc surface and the slope surface cooperate with the small wheel (123); the small wheel (123) is rotatably connected to the rotating rod (125). 126) Middle part; the inner end of the rotating rod (126) is hinged to the support (125), and the support (125) is fixedly installed on the rotating cylinder (14); the outer end of the rotating rod (126) is machined with a groove for positioning the nail core, and the upper surface of the outer end of the rotating rod is fixedly installed with a lower magnet (124); the lower surface of the outer circumference of the upper plate (13) is machined with an upper groove, and the upper magnet (128) is fixedly installed in the upper groove. The upper groove corresponds to the shape and size of the nail core top cap and positions the top cap together with the upper magnet (128); a support plate (127) is installed on the lower surface of the upper groove, and the support plate (127) is machined with a groove corresponding to the outer arc of the straight section of the nail core.

2. The blind rivet assembly machine according to claim 1, characterized in that: The fixed disk (7) is fixedly connected to the support pipe (16) at the center, and the upper support pipe (16) is fixedly connected to the upper bracket (17). The lower end of the upper bracket (17) is fixedly connected to the upper ring mold (15). The fixed disk (7) is fixed with the lower ring mold (11). The lower ring mold (11) corresponds to the upper ring mold (15). The lower surface of the upper ring mold (15) and the upper surface of the lower ring mold (11) are track surfaces, and the two track surfaces are consistent. The reversing air valve (6) rotates under the constraint of the upper and lower track surfaces.

3. The blind rivet assembly machine according to claim 2, characterized in that: On the upper support (17), a cover (18) is placed. Openings (19) are machined on both sides of the cover (18). The openings (19) are located at the loading and unloading stations of the assembly device (12).

4. The blind rivet assembly machine according to claim 1, characterized in that: The rotating sealing device (10) includes a gas chamber ring plate (101), an annular groove (103), a rotating cylindrical section (104), an annular top plate (106), and a fixed cylindrical section (110). The annular top plate (106) is installed on top of the gas chamber ring plate (101). The fixed disk (7), the support pipe (16), the annular top plate (106), and the gas chamber ring plate (101) constitute a sealing gas chamber, which is connected to the support pipe (16) through a gas hole (102). The gas chamber ring plate (101) is connected to the air inlet pipe of the reversing air valve (6). A gap is maintained between the bottom of the gas chamber ring plate (101) and the upper surface of the fixed disk (7). A fixed cylindrical section is fixedly connected to the fixed disk (7) on the outside of the gas chamber ring plate (101). Section (110); A gap is maintained between the top ring plate (106) and the outer surface of the support tube (16). Below the gap, an annular groove (103) and a rotating cylindrical section (104) are designed. The annular groove (103) is fixed to the outer surface of the support tube (16), and the rotating cylindrical section (104) is fixed to the lower surface of the top ring plate (106). The rotating cylindrical section (104) is inserted into the annular groove (103). The annular groove (103) is connected to the micro oil pump in the oil tank through an oil pipe. The lubricating oil provided by the micro oil pump leaks through the gap between the top ring plate (106) and the support tube (16) and the gap at the bottom of the air chamber annular plate to form an oil seal. A gap is maintained between the top ring plate (106) and the inner surface of the upper annular mold (15).

5. A blind rivet assembly machine according to claim 4, characterized in that: The reversing valve (6) includes a valve body (61), a lower outlet pipe (62), an upper outlet pipe (63), a valve plate (64), an upper inlet pipe (66), and a lower inlet pipe (68); the valve body (61) is fixedly connected to the turntable (3); the valve plate (64) is a vertical flat plate, installed in the middle of the valve body (61), and slides and seals with the valve body (61); an upper inlet (65) and an outlet (67) are machined on the valve plate (64). The lower air inlet (69) is located on one side of the valve plate (64) and is connected to the cylinder. The upper air inlet (66) and the lower air inlet (68) are located on the other side of the valve plate (64) and are connected to the rotating sealing device (10). The valve plate (64) moves up and down under the constraint of the upper and lower track surfaces. The upper roller (107) and the lower roller (109) are installed at the top and bottom ends of the valve plate (64).

6. The blind rivet assembly machine according to claim 4, characterized in that: The gap is sealed with a sealing ring.

7. A blind rivet assembly machine according to claim 4, characterized in that: The oil tank is located below the fixed plate (7).

8. A blind rivet assembly machine according to claim 7, characterized in that: The rotation drive device of the turntable (3) is designed between the oil tank and the cylinder.

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