Automatic assembling device for supporting legs of back plate of photo frame

Abstract

The utility model discloses an automatic assembling device for a photo frame back plate supporting leg, which comprises a working table, and a back plate feeding mechanism, a supporting leg feeding mechanism, a hinge feeding mechanism, a riveting pressing mechanism and a riveting bearing mechanism are arranged on the working table. After the back plate, the supporting feet and the hinges are conveyed in place by the respective feeding mechanisms, the gap problem existing at the joint of the back plate, the supporting feet and the hinges is eliminated through pre-tightening, and then the back plate, the supporting feet and the hinges are pressed to achieve riveting, so that the assembling quality is guaranteed, the qualified rate of finished products is improved, the assembling efficiency is also improved, and the production cost is effectively reduced. The whole set of feeding, butt joint and riveting is automatic and unattended, and the automation degree is high; storage and feeding of the back plate and the supporting legs can be adaptively adjusted according to different dimensions, and production flexibility is good.

Description

Technical Field

[0001] This utility model relates to the technical field of picture frame processing equipment, and more specifically to an automatic assembly device for picture frame back panel support legs. Background Technology

[0002] In the field of picture frame manufacturing, the assembly of the picture frame back panel and the support legs is a crucial and indispensable step.

[0003] Traditionally, the assembly of picture frame back panels and legs relies mainly on manual operation. Manual assembly is slow and inefficient. Moreover, the precision of manual operation is affected by factors such as worker skill level and fatigue, making it difficult to ensure that the assembly quality of each picture frame is completely consistent. Problems such as misaligned legs and insecure fixing are common, reducing the product qualification rate and increasing the defect rate and after-sales maintenance costs.

[0004] To improve production efficiency, some automatic assembly equipment for picture frame back panels and legs has appeared on the market. For example, patent application number CN202411057476.9 discloses an automatic binding device for picture frame back panels and legs. A back panel feeding mechanism is installed on the top of the machine box. The back panel feeding mechanism includes a back panel buffer frame and two guide rails. The two guide rails are installed parallel to each other on the top of the machine box. The back panel buffer frame is installed at one end above the guide rails. A binding mechanism is also installed on the top of the machine box above the guide rails. A vibratory feeder is installed on one side of the top of the machine box. A hinge feeding mechanism is installed on the side of the vibratory feeder on the top of the machine box. A leg feeding mechanism is also installed on the side of the guide rails on the top of the machine box.

[0005] For example, patent application CN201921570010.3 discloses a photo frame back panel snap-fit ​​riveting device, which includes a base, a first feeding unit, a second feeding unit, a positioning pin, and a riveting punch. The first feeding unit has a first guide arm, and the second feeding unit has a second guide arm. The first and second guide arms respectively guide the snap-fit ​​body and the sleeve to the riveting station, achieving vertical alignment between the sleeve and the snap-fit ​​body. The positioning pin has telescopic characteristics, extending to connect the sleeve guided by the second guide arm and the snap-fit ​​body guided by the first guide arm, providing riveting alignment between the sleeve and the snap-fit ​​body. The riveting punch is arranged above the riveting seat and connected to a power mechanism, which drives the riveting punch to reciprocate up and down for riveting. The first and second guide arms perform avoidance actions during riveting. This patented technology features automatic feeding riveting, high riveting efficiency, and saves labor and production costs. It also reduces the risk of hand injuries during the riveting process, making production safer and suitable for industrial use.

[0006] However, in practice, similar automatic riveting devices for backplate supports all have a common problem: the backplate, support, and hinge are pre-positioned by their respective feeding mechanisms. To facilitate the hinge's insertion between the backplate and support, the gap between the backplate and support is widened to slightly more than the height of a hinge. Therefore, after the three are in place, there will be gaps between them. Then, when the power mechanism drives the riveting punch to perform the riveting work, either the hinge is pressed in place partially but not fully, or the gap between the support and the hinge is large after riveting. Worse results may occur, such as stress-induced microcracks or accidental breakage of the support. In short, various defective products will be generated, the product qualification rate will be low, costs will be increased, and production efficiency will be reduced. Utility Model Content

[0007] The purpose of this utility model is to overcome the above-mentioned defects of the prior art and provide an automatic assembly device for the back panel support legs of a picture frame that has a high degree of automation, good production flexibility, guaranteed assembly quality, improved assembly efficiency, and reduced production costs.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: an automatic assembly device for a photo frame back panel support leg, comprising a workbench, on which a back panel feeding mechanism, a support leg feeding mechanism, a hinge feeding mechanism, a riveting and pressing mechanism, and a riveting support mechanism are provided. The riveting and pressing mechanism is characterized in that it includes a cantilever frame, on which a pair of fourth slide rails arranged vertically in parallel are provided. Each of the fourth slide rails is provided with a fourth slider, and the two fourth sliders are provided with a fourth sliding plate. A power mechanism for driving the fourth sliding plate to reciprocate up and down is provided on one side of the fourth sliding plate. A pressing head and a pre-tightening head are arranged in a staggered manner on the other side of the fourth sliding plate, wherein the pre-tightening head is located above and outside the pressing head.

[0009] A riveting pre-positioning mechanism is provided below the pre-tightening head. The riveting pre-positioning mechanism includes a pair of vertically arranged fifth slide rails. A fifth slider is slidably arranged in the gap between the two fifth slide rails. A return spring is provided between the fifth slider and each of the fifth slide rails. The fifth slider is engaged with the pre-tightening head.

[0010] This invention adds a pre-positioning mechanism before the riveting and clamping mechanism. After the back plate, support legs, and hinges are delivered to their respective positions by their feeding mechanisms, they are pre-tightened to eliminate gaps at the joints, and then clamped to achieve riveting. This ensures assembly quality, improves the finished product qualification rate, increases assembly efficiency, and effectively reduces production costs. The entire feeding, docking, and riveting process is automated and unattended, with a high degree of automation. The material storage and feeding of the back plate and support legs can be adjusted to accommodate different sizes and specifications, providing good production flexibility.

[0011] The clamping head and the pre-tightening head of the riveting pre-positioning mechanism of this utility model use the same power system, eliminating the need for a separate power system and saving costs. The clamping head and the pre-tightening head need to work in a specific order; however, simply having different heights is insufficient. Otherwise, the pre-tightening head would simply lower down to complete the riveting, rendering the clamping head unnecessary and eliminating the pre-tightening step. Therefore, this utility model is ingeniously designed. After the pre-tightening head is in place, it stops pressing but maintains a pressed state, waiting for the clamping head to follow up to complete the riveting in one fell swoop. In this process, after the fifth slider of the riveting pre-positioning mechanism is pushed into place by the pre-tightening head, the return spring absorbs the energy of the subsequent movement, thus maintaining the pressed state.

[0012] Preferably, the preload head is provided with a through screw hole, and a first screw rod is provided in the screw hole with a threaded engagement. A first nut is provided on the first screw rod with a threaded engagement. The first screw rod is engaged with the fifth slider.

[0013] The simplest way to achieve this is to have the fifth slider directly pushed down by the first screw of the pre-tightening head. As long as the specifications of the return spring are properly selected, the return spring can absorb the energy that follows, so that the fifth slider replaces the pre-tightening head to press the back plate, support foot and hinge into place and then stops pressing but maintains the pressing state, waiting for the pressing head to follow up to achieve the final riveting.

[0014] Preferably, the pre-tightening head is provided with a downwardly extending ejector pin, the upper end of the fifth slider is fixedly connected to a drive rack, a drive gear is engaged on the side of the drive rack, and an actuating block is eccentrically provided on the side of the drive gear, the actuating block being engaged with the ejector pin.

[0015] In this invention, a mechanism is added to the fifth slider to optimize the power transmission. Specifically, the eccentrically positioned actuating block on the drive gear plays a crucial role. When the preload head is pressed down, it is subjected to force, but its trajectory is circular rather than the straight downward movement of the preload head. Thus, after pressing down a certain distance, it is no longer subjected to the downward pressure of the preload head, but is blocked to the side by the preload head and cannot reset, thus becoming a preload holding state.

[0016] Preferably, the power mechanism includes a second motor and a reducer mounted on the cantilever frame. The motor shaft of the second motor is connected to the input shaft of the reducer. A drive disc is mounted on the output shaft of the reducer, and an eccentric wheel is eccentrically mounted on the drive disc. A horizontally arranged fourth slide groove is provided on one side of the fourth slide plate. The fourth slide groove is perpendicular to any fourth slide rail, and the eccentric wheel is slidably mounted in the fourth slide groove.

[0017] This invention adds a speed reducer to the second motor, which can transform the high-speed, low-torque output of the motor into a low-speed, high-torque output. This allows for a better match between the second motor and the driven mechanism, reduces the impact load on the mechanical structure, enables the second motor to better adapt to load requirements, and improves the service life of the second motor.

[0018] The power transmission mechanism of this invention is quite unique. It utilizes the horizontal reciprocating motion of an eccentric wheel within the fourth slide groove, while the eccentric wheel itself rotates on the drive disc. The superposition of these two motions, combined with the perpendicular relationship between the fourth slide rail and the fourth slide groove, results in the vertical reciprocating motion of the fourth slide plate. This mechanism provides smooth power output and effectively protects the motor and reducer.

[0019] Preferably, the riveting support mechanism includes a top column erected on the workbench, and a support block is provided at the top of the top column.

[0020] The riveting clamping mechanism applies downward force to drive the rivet-bearing hinge into the back plate and support legs to form a riveting structure. The back plate is suspended in the air on the back plate feeding mechanism. This utility model designs a top column and a support block directly below the riveting pressure to share this riveting pressure. This not only effectively protects the back plate and prevents deformation and hidden cracks in the back plate, but also ensures that the riveting clamping mechanism presses down consistently each time, thus quickly and accurately achieving the riveting structure.

[0021] Preferably, the backplate feeding mechanism includes a pair of parallel, spaced-apart first and second material-supporting guide rails. A first circulating chain is provided beside the first material-supporting guide rail, and a first pusher block is provided on the first circulating chain. A second circulating chain is provided beside the second material-supporting guide rail, and a second pusher block is provided on the second circulating chain. A first drive sprocket and a first driven sprocket are respectively provided at the beginning and end of the first circulating chain. A second drive sprocket and a second driven sprocket are respectively provided at the beginning and end of the second circulating chain. A drive shaft that connects the first and second drive sprockets in series for synchronous driving is passed through them. The drive shaft is connected to a drive mechanism that drives the mechanism. The drive mechanism includes the following structure: a first motor, a drive pulley is provided on the motor shaft of the first motor, and the drive pulley is connected to a driven pulley via a transmission belt. The driven pulley is located at one end of the drive shaft.

[0022] After the back plate falls into place, it is supported between the first and second material support guide rails. The first motor starts and transmits power to the drive shaft through the driven pulley, transmission belt and drive pulley. Then, the first drive sprocket, the second drive sprocket, the first driven sprocket and the second driven sprocket drive the first and second circulating chain belts to rotate synchronously in the same direction. Finally, the first pusher block and the second pusher block push the back plate forward between the riveting and pressing mechanism and the riveting support mechanism, completing the back plate feeding work.

[0023] Preferably, the first material support guide rail, the first circulating chain belt, the first drive sprocket, and the first driven sprocket are all mounted on a fixed bracket, which is mounted on a worktable; the second material support guide rail, the second circulating chain belt, the second drive sprocket, and the second driven sprocket are all mounted on a movable bracket, with a pair of first sliders installed below each end of the movable bracket along its length, and each pair of first sliders is mounted on a first slide rail, which is mounted on the worktable; the drive shaft is suspended on the worktable by a pair of support plates, which exist independently of the movable bracket and the fixed bracket; the outer surface of the drive shaft is provided with several strips of equal arc length and spaced apart, all extending along its axial direction, and the inner walls of the first and second drive sprockets are each provided with several grooves that are the same number as the strips on the drive shaft and match one-to-one.

[0024] This utility model takes into account the different sizes of the back panel. The original design of this utility model is to meet the feeding work of back panels of any size. Therefore, in order to match the different sizes of the back panels, the second material support guide rail and the second circulating chain are designed onto the movable bracket, so that the distance between them and the first material release guide rail and the first circulating chain can be adjusted, thereby meeting the needs of supporting photo frame back panels of different sizes.

[0025] To facilitate the above design, in order for the second circulating chain to move, the second drive sprocket driving its rotation should also be able to slide. The second drive sprocket needs to be able to slide axially on the drive shaft while also achieving radial transmission. Therefore, the second drive sprocket and drive shaft must be locked radially to prevent transmission slippage. Thus, inserts and grooves are preferably designed to satisfy both actions. The purpose of designing the first drive sprocket in this way is twofold: firstly, to reduce the number of parts of different specifications, thus lowering the installation difficulty; and secondly, to lay the groundwork for future implementation of sliding functionality for the first drive sprocket.

[0026] Preferably, the support-feeding mechanism includes a stacking frame, a discharge notch is provided on the bottom side of the stacking frame, a pusher plate is provided on the horizontal side of the discharge notch, and a triangular groove is provided on the pusher plate. The pusher plate is fixedly connected to a third slider, the third slider is slidably disposed on a third slide rail, the third slide rail is disposed on the stacking frame, and a third cylinder is disposed on the stacking frame. The cylinder shaft of the third cylinder is connected to the third slider.

[0027] In order to feed the stacked support legs one by one, the first problem to be solved is the peeling problem. Here, a triangular groove is cleverly set on the push plate, ensuring that the height of the triangular groove is less than or equal to the thickness of a support leg. So when the bottom support leg is inserted into the push plate (the push plate is also the lower end of the stacking rack), the push plate can easily push out a support leg with a side push. In order to prevent the upper support legs from being pulled out by friction, the height of the discharge notch set on the front side of the push plate is only matched with the thickness of a support leg. In this way, the upper support legs will not be pulled out.

[0028] Preferably, the stacking rack includes a first cantilever beam horizontally suspended on the workbench. A second slide rail lies horizontally on the first cantilever beam, and a second slider that can slide freely on the second slide rail is provided. A slide rod seat is fixedly connected to the side of the second slider, and a pair of vertically parallel slide rods are provided on the slide rod seat. A second nut is fixedly connected above the second slider, and a second screw passes through the second nut. A slide rail seat is connected to the same side end of the first cantilever beam and the second screw. A vertically arranged slide rail is provided on the slide rail seat, and the slide rail is parallel to and opposite the two slide rods. A grooved rod extending along the length direction is provided in the groove of the slide rail, and the grooved rod is movably installed in the groove of the slide rail by an adjusting bolt. A rotating wheel is fixedly connected to the free end of the second screw. The discharge notch is provided at the bottom of the slide rail, and the third cylinder and the third slide rail are provided on the slide rod seat.

[0029] This invention takes into account the different sizes of the support legs, and its design aims to accommodate the feeding of support legs of any size. Therefore, to match different sizes of support legs, the head end of the support leg has a straight edge (connected to the back plate for riveting and hinges), and the tail end has a triangular edge. The triangular edge is limited by a pair of parallel sliding rods, which can accommodate any size; the only question is how much the triangle is pushed in. However, if the straight edge is limited by a sliding track, a groove rod needs to be added inside the track to adjust the width and accommodate the width of the support leg head. With the dimensions of the support legs at both ends taken into account, the issue of varying lengths needs to be addressed. This length is achieved by adjusting the distance between the slide rail and the slide rod, or more precisely, by adjusting the distance between the slide rail seat and the slide rod seat. The slide rail seat is fixed relative to the first cantilever beam, while it rotates at a fixed point relative to the second screw. In other words, a bearing seat is provided on the slide rail seat for the second screw to be mounted. The rotating wheel drives the second screw to rotate, causing the second slider to slide relative to the second slide rail, which in turn slides relative to the first cantilever beam. This, in turn, causes the slide rod seat to move relative to the slide rail seat, thereby changing the distance between the slide rail and the slide rod to meet the material feeding and storage needs of different support leg lengths.

[0030] Preferably, the hinge feeding mechanism includes a second cantilever beam horizontally suspended on the workbench, a fourth slide rail horizontally lying on the second cantilever beam, a fourth slider freely sliding on the fourth slide rail, a push rod fixedly connected to the fourth slider, a strong magnet on the free end of the push rod, a fourth cylinder on the second cantilever beam, the cylinder shaft of the fourth cylinder connected to the push rod, and a storage box on one end of the second cantilever beam, the storage box being located directly below the push rod.

[0031] The storage box of this utility model is actually the end of a conveyor track, with its starting point being a vibrating feeding tray. This type of hinge storage and replenishment device is quite common and used in various industries, such as in the patent drafts of the background technology and vibrating feeding devices for zipper heads, etc., which will not be elaborated upon in this utility model. During the reciprocating motion of the push rod pushed by the fourth cylinder, it passes through the storage box and is attracted by a strong magnet, and then sent out between the riveting and pressing mechanism and the riveting support mechanism.

[0032] Beneficial effects: This utility model adds a riveting pre-positioning mechanism before the riveting and clamping mechanism. After the back plate, support legs, and hinges are delivered to their respective positions by their feeding mechanisms, they are pre-tightened to eliminate gaps at the joints, and then pressed together to achieve riveting. This ensures assembly quality, improves the finished product qualification rate, increases assembly efficiency, and effectively reduces production costs. The entire feeding, docking, and riveting process is automated and unattended, with a high degree of automation. The material storage and feeding of the back plate and support legs can be adjusted according to different sizes and specifications, providing good production flexibility. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of this utility model;

[0034] Figure 2 This is a schematic diagram of the riveting support mechanism of this utility model;

[0035] Figure 3 This is a schematic diagram of the backplate feeding mechanism of this utility model;

[0036] Figure 4 This is a schematic diagram of the support-feeding mechanism of this utility model;

[0037] Figure 5 This is a partial structural schematic diagram of the support-feeding mechanism of this utility model;

[0038] Figure 6 This is a schematic diagram of the hinge feeding mechanism of this utility model;

[0039] Figure 7 This is a schematic diagram of the riveting and clamping mechanism of this utility model;

[0040] Figure 8 This is a partial structural schematic diagram of the riveting and clamping mechanism of this utility model;

[0041] Figure 9 This is a partial structural diagram of one of the riveting and clamping mechanisms of this utility model;

[0042] Figure 10 This is a partial structural diagram of another riveting and clamping mechanism of this utility model;

[0043] Figure 11 This is a schematic diagram of the structure of one type of riveting pre-positioning mechanism of this utility model. 。

[0044] Figure 12 This is a schematic diagram of another riveting pre-positioning mechanism of the present invention. 。

[0045] In the diagram: 1-Workbench, 2-Backplate feeding mechanism, 3-Support leg feeding mechanism, 4-Hinge feeding mechanism, 5-Riveting support mechanism, 6-Riveting clamping mechanism, 7-Backplate, 8-Support leg, 9-Drive mechanism, 10-Top column, 11-Support block, 12-First support guide rail, 13-Second support guide rail, 14-First circulating chain, 15-Second circulating chain, 16-First pusher block, 17-Second pusher block, 1 8-First drive sprocket, 19-First driven sprocket, 20-Second drive sprocket, 21-Second driven sprocket, 22-Drive shaft, 23-Fixed bracket, 24-Modible bracket, 25-First slider, 26-First slide rail, 27-Support plate, 28-First cantilever beam, 29-Second slide rail, 30-Second slider, 31-Slide rod seat, 32-Slide rod, 33-Second nut, 34-Second screw, 35-Slide track 36-Slide rail, 37-Groogging rod, 38-Adjusting bolt, 39-Discharge notch, 40-Push plate, 41-Third slider, 42-Third slide rail, 43-Third cylinder, 44-Triangular groove, 45-Second cantilever beam, 46-Fourth slide rail, 47-Fourth slider, 48-Push rod, 49-Strong magnet, 50-Fourth cylinder, 51-Storage box, 52-Cantilever frame, 53-Second motor, 54-Reduction gear Device, 55-Fourth slide rail, 56-Fourth slider, 57-Fourth slide plate, 58-Fourth slide groove, 59-Pressure head, 60-Pre-tightening head, 61-Drive turntable, 62-Eccentric wheel, 63-Fifth slide rail, 64-Fifth slider, 65-Reset spring, 66-Drive rack, 67-Drive gear, 68-Actuating block, 69-Rotating wheel, 70-Hinge, 71-First screw, 72-First nut, 73-Ejector pin. Detailed Implementation

[0046] To make the technical means, creative features and objectives of this utility model easier to understand, the following describes this utility model in conjunction with specific embodiments.

[0047] Example 1: As Figure 1 As shown, an automatic assembly device for a picture frame back panel support leg includes a workbench 1, on which a back panel feeding mechanism 2, a support leg feeding mechanism 3, a hinge feeding mechanism 4, a riveting and clamping mechanism 6, and a riveting and supporting mechanism 5 are arranged. The back panel 7 is on the back panel feeding mechanism 2, and the support leg 8 is on the support leg feeding mechanism 3.

[0048] like Figure 2 As shown, the riveting support mechanism 5 includes a top column 10 erected on the workbench. A support block 11 is provided at the top of the top column 10. The support block 11 is located directly below the convergence point of the back plate feeding mechanism 2, the support foot feeding mechanism 3, and the hinge feeding mechanism 4.

[0049] like Figure 3As shown, the back plate feeding mechanism 2 includes a pair of parallel and spaced first material support guide rails 12 and second material support guide rails 13. A first circulating chain belt 14 is provided next to the first material support guide rail 12, and a first pusher block 16 is provided on the first circulating chain belt 14. A second circulating chain belt 15 is provided next to the second material support guide rail 13, and a second pusher block 17 is provided on the second circulating chain belt 15.

[0050] The first and second ends of the first circulating chain belt 14 are respectively provided with a first drive sprocket 18 and a first driven sprocket 19. The first and second ends of the second circulating chain belt 15 are respectively provided with a second drive sprocket 20 and a second driven sprocket 21. A drive shaft 22 runs through the first drive sprocket 18 and the second drive sprocket 20, connecting them in series for synchronous driving. The outer surface of the drive shaft 22 is provided with six strips of equal arc length and spaced apart, all extending along its axial direction. The inner walls of the first drive sprocket 18 and the second drive sprocket 20 are each provided with six grooves that are the same number as the strips on the drive shaft 22 and match each other.

[0051] The drive shaft 22 is connected to a drive mechanism 9 that drives its operation. The drive shaft 22 is suspended on the worktable 1 by a pair of support plates 27. The two support plates 27 exist independently of the movable bracket 24 and the fixed bracket 23.

[0052] The drive mechanism 9 includes the following structure: a first motor, a drive pulley is provided on the motor shaft of the first motor, the drive pulley is connected to a driven pulley through a transmission belt, and the driven pulley is provided on one end of the drive shaft 22.

[0053] The first material guide rail 13, the first circulating chain belt 15, the first drive sprocket 20 and the first driven sprocket 21 are all mounted on a fixed bracket 23, which is mounted on the workbench 1.

[0054] The second material guide rail 12, the second circulating chain belt 14, the second drive sprocket 18, and the second driven sprocket 19 are all mounted on a movable bracket 24. A pair of first sliders 25 are installed at the bottom of each end of the movable bracket 24 along its length. Each pair of first sliders 25 is mounted on a first slide rail 26. The two first slide rails 26 are mounted on the worktable 1. A stop bolt connects the movable bracket 24 and the worktable 1.

[0055] like Figure 4 and Figure 5As shown, the support-feeding mechanism 3 includes a stacking frame, which includes a first cantilever beam 28 horizontally suspended on the workbench. A second slide rail 29 is horizontally laid on the first cantilever beam 28. A second slider 30 that can slide freely on the second slide rail 29 is provided. A slide rod seat 31 is fixedly connected to the side of the second slider 30. A pair of vertically parallel slide rods 32 are provided on the slide rod seat 31. A second nut 33 is fixedly connected above the second slider 30. A second screw 34 passes through the second nut 33. A rotating wheel 69 is fixedly connected to the free end of the second screw 34.

[0056] A slide seat 35 is connected to the same side end of the first cantilever beam 28 and the second screw 34. The slide seat 35 is fixedly connected to the first cantilever beam 28, and a bearing is provided at the connection between the second screw 34 and the slide seat 35. A vertically arranged slide 36 is provided on the slide seat 35, and the slide 36 is parallel and opposite to the two slide rods 32.

[0057] A groove rod 37 extending along the length of the slide rail 36 is provided in the groove of the slide rail. The groove rod 37 is movably installed in the groove of the slide rail by an adjusting bolt 38. If there is only one adjusting bolt 28, a pair of supporting sliding columns are required to assist in supporting the groove rod 37. If there are two or more adjusting bolts 38, the above-mentioned sliding columns are not required.

[0058] The bottom of the slide 36 is provided with a discharge notch 39. A pusher plate 40 is provided on the horizontal side of the discharge notch 39. The pusher plate 40 is fixedly connected to a third slider 41. The third slider 41 is slidably mounted on a third slide rail 42. The third slide rail 42 is mounted on a slide rod seat 41. A third cylinder 43 is also provided on the slide rod seat 41. The cylinder shaft of the third cylinder 43 is connected to the third slider 42.

[0059] A triangular groove 44 is provided on the pusher plate 40 and is recessed into its surface. The triangular groove 44 fits the triangle at the tail of the support leg 8. The depth of the triangular groove 44 is equal to the thickness of the support leg 8.

[0060] like Figure 6 As shown, the hinge feeding mechanism 4 includes a second cantilever beam 45 horizontally suspended on the workbench. A fourth slide rail 46 is horizontally mounted on the second cantilever beam 45. A fourth slider 47, which can slide freely on the fourth slide rail 46, is fixedly connected to the fourth slider 47. A strong magnet 49 is mounted on the free end of the pusher rod 48. A fourth cylinder 50 is mounted on the second cantilever beam 45. The cylinder shaft of the fourth cylinder 50 is connected to the pusher rod 48. A storage box 51 is mounted on one end of the second cantilever beam 45. The storage box 51 is located directly below the pusher rod 48.

[0061] like Figure 7 , Figure 8 and Figure 9 As shown, the riveting and clamping mechanism 6 includes a cantilever frame 52, on which a second motor 53 and a reducer 54 are mounted. The motor shaft of the second motor 53 is connected to the input shaft of the reducer 54. A drive disc 61 is mounted on the output shaft of the reducer 54, and an eccentric wheel 62 is eccentrically mounted on the drive disc 61.

[0062] The cantilever frame 52 is also provided with a pair of fourth slide rails 55 arranged vertically in parallel. Each fourth slide rail 55 is provided with a fourth slider 56. The two fourth sliders 56 are provided with a fourth slide plate 57. One side of the fourth slide plate 57 is provided with a horizontally arranged fourth slide groove 58. The fourth slide groove 58 is arranged perpendicular to the two fourth slide rails 55. The eccentric wheel 62 is slidably disposed in the fourth slide groove 58. On the other side of the fourth slide plate 57, a pressing head 59 and a pre-tightening head 60 are arranged in a staggered manner in front, behind, up, and down. The pre-tightening head 60 is located above and outside the pressing head 59.

[0063] like Figure 10 and 11 As shown, the preload head 60 is provided with a threaded hole that runs vertically through it. A first screw 71 is threadedly arranged in the threaded hole, and a first nut 72 is threadedly arranged on the first screw 71.

[0064] A riveting pre-positioning mechanism is provided below the pre-tightening head 60. The riveting pre-positioning mechanism includes a pair of vertically arranged fifth slide rails 63. A fifth slider 64 is slidably arranged in the gap between the two fifth slide rails 63. The fifth slider 64 is T-shaped. A return spring 65 is provided between the fifth slider 64 and each fifth slide rail 63. The first screw 71 is engaged with the fifth slider 64.

[0065] The aforementioned fifth slide rail 63, fifth slider 64 and return spring 65 are all installed on the stacking frame of the support foot feeding mechanism 3, or more specifically on the slide rail 36.

[0066] Example 2: Figure 12 As shown, a drive rack 66 is fixedly connected to the upper end of the fifth slider 64, a drive gear 67 is meshed on the side of the drive rack 66, an actuating block 68 is eccentrically arranged on the side of the drive gear 67, and a downwardly extending pin 73 is provided on the pre-tightening head 60, and the pin 73 is engaged with the actuating block 68.

[0067] The aforementioned actuating block 68, drive gear 67, drive rack 66, fifth slide rail 63, fifth slider 64 and return spring 65 are all mounted on the stacking frame of the support foot feeding mechanism 3, more specifically on the slide rail 36, wherein the drive rack 66 and the fifth slider 64 are integrated.

[0068] The rest is the same as in Example 1.

[0069] Example 3: In order to make the mechanism operate more stably, the stacking frame of the support feeding mechanism 3 and the cantilever frame 52 of the riveting and pressing mechanism 6 are close to each other and can be connected and bound together. More specifically, the slide 36 is locked together with the cantilever frame 52.

[0070] The rest is the same as in Example 1.

[0071] Usage: In the backplate feeding mechanism, adjust the distance between the first and second material support rails according to the specific dimensions of the backplate 7. Unlock the movable bracket to allow it to move. After adjustment, lock the movable bracket so that it cannot move. Then feed the material. The backplate is placed between the first and second material support rails. The first motor drives the drive shaft to rotate through the transmission mechanism. The drive shaft drives the first and second circulating chain belts to rotate synchronously, thereby allowing the first and second pusher blocks to push the backplate to the assembly center point (that is, directly above the support block of the riveting support mechanism, as described below).

[0072] In the support foot feeding mechanism, the distance between the slide rail and the slide rod is adjusted according to the specific dimensions of the support foot 8 (one end of the support foot has a straight edge, and the other end has a triangular edge). By rotating the wheel, the second screw is driven to rotate forward or backward, causing the second slider to drive the slide rod seat to move back and forth. The triangular edge of the support foot at the tail inserts into the two slide rods, and the straight edge of the support foot at the head is embedded in the slide rail. Therefore, the width of the slide rail groove must also be adjusted in advance. This is achieved by adjusting the adjusting bolt to compress or open the groove width of the groove rod. The support feet are stacked in layers in an open stacking rack. The bottom support foot is just supported by the pusher plate, and its tail is just embedded in the triangular groove of the pusher plate. Under the power of the third cylinder, the pusher plate pushes the bottom support foot out of the discharge notch (the side of the discharge notch is open, and the support foot only needs to be partially pushed forward to press the head for riveting. After completion, it is slid out through the side) and delivered to the assembly center point.

[0073] In the hinge feeding mechanism, the fourth cylinder reciprocates to push the push rod. When it retracts, the strong magnet picks up a hinge 70 from the storage box and then delivers it to the assembly center point.

[0074] Back panel 7, hinge 70 and support leg 8 are stacked in sequence. The top column and support block of the riveting support mechanism support them directly below the riveting position and share the subsequent riveting pressure.

[0075] In the riveting and clamping mechanism, pre-tightening is first used to eliminate the gap problem at the joint of the back plate 7, hinge 70 and support leg 8. After the pre-tightening head is pressed into place, it stops pressing and maintains the pressing state, waiting for the clamping head to catch up, so that the riveting can be completed in one hammer.

[0076] The detailed process is broken down as follows:

[0077] After the second motor reduces speed and increases torque through the reducer, it drives the drive disc to rotate. The drive disc causes the eccentric wheel to move eccentrically on it. The eccentric wheel then moves back and forth relative to the fourth slide rail. The fourth slide rail and the fourth slide rail are arranged perpendicularly, which changes the direction of the force transmitted by the eccentric wheel, causing the fourth slide plate to move up and down, thereby driving the pressing head and the pre-tensioning head to move up and down reciprocally.

[0078] In Example 1, during the synchronous pressing of the clamping head and the pre-tightening head, the first screw of the pre-tightening head first presses down on the fifth slider of the riveting pre-positioning mechanism. The fifth slider contacts the support foot and slowly presses down on the back plate 7, hinge 70 and support foot 8, eliminating the gap between them. However, it does not descend indefinitely. After the fifth slider is pushed into position, when the pre-tightening head moves down again, the return spring absorbs the energy that follows, thus maintaining the pressing state. The clamping head then contacts the support foot, thereby achieving a decisive riveting.

[0079] In embodiment 2 of the alternative scheme, during the synchronous downward pressing of the clamping head and the pre-tightening head, the pin of the pre-tightening head contacts the actuating block of the riveting pre-positioning mechanism. The actuating block drives the drive gear to rotate, thereby causing the drive rack to move downward. This allows the fifth slider to contact the support foot, slowly pressing the back plate 7, hinge 70, and support foot 8 and eliminating the gap between them. However, the downward movement is not unlimited. After the fifth slider is pushed into position, when the pin moves downward again, there is a clever structure: the actuating block's trajectory is circular, rather than the pin's straight downward movement. After the actuating block has been pressed down a certain distance, it is no longer subject to the downward pressure of the pin and is blocked by the pin, preventing it from resetting. The pin cannot press the actuating block down further, thus creating a pre-pressing holding state. When the pre-tightening head moves downward again, the clamping head begins to contact the support foot, thereby achieving a final riveting operation.

Claims

1. An automatic assembly device for a picture frame back panel support leg, comprising a workbench, wherein the workbench is provided with a back panel feeding mechanism, a support leg feeding mechanism, a hinge feeding mechanism, a riveting and clamping mechanism, and a riveting and supporting mechanism, characterized in that, The riveting and clamping mechanism includes a cantilever frame, on which a pair of fourth slide rails are arranged in parallel vertical directions. Each of the fourth slide rails is provided with a fourth slider, and the two fourth sliders are provided with a fourth slide plate. A power mechanism for driving the slide plate to reciprocate up and down is provided on one side of the slide plate. A clamping head and a pre-tightening head are arranged in a staggered manner in front, behind, up, and down directions on the other side of the slide plate. The pre-tightening head is located above and outside the clamping head. A riveting pre-positioning mechanism is provided below the pre-tightening head. The riveting pre-positioning mechanism includes a pair of vertically arranged fifth slide rails. A fifth slider is slidably arranged in the gap between the two fifth slide rails. A return spring is provided between the fifth slider and each of the fifth slide rails. The fifth slider is engaged with the pre-tightening head.

2. The automatic assembly device for the back panel support legs of a picture frame according to claim 1, characterized in that, The preload head is provided with a through screw hole, and a first screw rod is provided in the screw hole with a threaded engagement. A first nut is provided on the first screw rod with a threaded engagement. The first screw rod is engaged with the fifth slider.

3. The automatic assembly device for the back panel support legs of a picture frame according to claim 1, characterized in that, The pre-tightening head is provided with a downwardly extending ejector pin. The upper end of the fifth slider is fixedly connected to a drive rack. A drive gear meshes with the side of the drive rack. An actuating block is eccentrically arranged on the side of the drive gear. The actuating block is engaged with the ejector pin.

4. An automatic assembly device for the back panel support legs of a picture frame according to claim 1, 2, or 3, characterized in that, The power mechanism includes a second motor and a reducer mounted on the cantilever frame. The motor shaft of the second motor is connected to the input shaft of the reducer. A drive disc is mounted on the output shaft of the reducer, and an eccentric wheel is eccentrically mounted on the drive disc. A horizontally arranged fourth slide groove is provided on one side of the fourth slide plate. The fourth slide groove is perpendicular to any fourth slide rail, and the eccentric wheel is slidably mounted in the fourth slide groove.

5. The automatic assembly device for the back panel support legs of a picture frame according to claim 1, characterized in that, The riveting support mechanism includes a top column erected on the workbench, and a support block is provided at the top of the top column.

6. The automatic assembly device for the back panel support legs of a picture frame according to claim 1, characterized in that, The backplate feeding mechanism includes a pair of parallel and spaced first and second material-supporting guide rails. A first circulating chain is provided next to the first material-supporting guide rail, and a first pusher block is provided on the first circulating chain. A second circulating chain is provided next to the second material-supporting guide rail, and a second pusher block is provided on the second circulating chain. The first circulating chain belt has a first drive sprocket and a first driven sprocket at its two ends, and the second circulating chain belt has a second drive sprocket and a second driven sprocket at its two ends, respectively. A drive shaft that connects the first drive sprocket and the second drive sprocket in series and drives them synchronously passes through them. The drive shaft is connected to a drive mechanism that drives them to operate. The drive mechanism includes the following structure: a first motor, a drive pulley is provided on the motor shaft of the first motor, the drive pulley is connected to a driven pulley through a transmission belt, and the driven pulley is provided on one end of the drive shaft.

7. The automatic assembly device for the back panel support legs of a picture frame according to claim 6, characterized in that, The first material support guide rail, the first circulating chain belt, the first drive sprocket and the first driven sprocket are all mounted on a fixed bracket, which is mounted on a workbench; The second material support guide rail, the second circulating chain belt, the second drive sprocket and the second driven sprocket are all mounted on a movable bracket. A pair of first sliders are installed below each of the first and second ends of the movable bracket along its length. Each pair of first sliders is mounted on a first slide rail. The two first slide rails are mounted on the worktable. The drive shaft is suspended on the workbench by a pair of support plates, and the two support plates exist independently of the movable bracket and the fixed bracket; The outer surface of the drive shaft is provided with several strips of equal arc length and spaced apart, all extending along its axial direction. The inner walls of the first drive sprocket and the second drive sprocket are each provided with several grooves that are the same number as the strips on the drive shaft and match each other.

8. The automatic assembly device for the back panel support legs of a picture frame according to claim 1, characterized in that, The support feeding mechanism includes a stacking frame, a discharge notch is provided on the bottom side of the stacking frame, a pusher plate is provided on the horizontal side of the discharge notch, and a triangular groove is provided on the pusher plate. The pusher plate is fixedly connected to a third slider, the third slider is slidably disposed on a third slide rail, the third slide rail is disposed on the stacking rack, and a third cylinder is disposed on the stacking rack, the cylinder shaft of the third cylinder being connected to the third slider.

9. The automatic assembly device for the back panel support legs of a picture frame according to claim 8, characterized in that, The stacking rack includes a first cantilever beam that is horizontally suspended on the workbench. A second slide rail is horizontally laid on the first cantilever beam. A second slider that can slide freely on the second slide rail is provided. A slide rod seat is fixedly connected to the side of the second slider. A pair of vertically parallel slide rods are provided on the slide rod seat. A second nut is fixedly connected above the second slider. A second screw passes through the second nut. The first cantilever beam and the second screw are connected to a slide seat on the same side. The slide seat is provided with a vertically arranged slide. The slide is parallel to and opposite the two slide rods. A groove rod extending along its length is provided in the groove of the slide. The groove rod is movably installed in the groove of the slide by an adjusting bolt. A rotating wheel is fixedly connected to the free end of the second screw, the discharge notch is located at the bottom of the slide, and the third cylinder and the third slide rail are located on the slide rod seat.

10. The automatic assembly device for the back panel support legs of a picture frame according to claim 1, characterized in that, The hinge feeding mechanism includes a second cantilever beam horizontally mounted on the workbench. A fourth slide rail lies horizontally on the second cantilever beam. A fourth slider is mounted on the fourth slide rail and can slide freely thereon. A push rod is fixedly connected to the fourth slider. A strong magnet is mounted on the free end of the push rod. A fourth cylinder is mounted on the second cantilever beam. The cylinder shaft of the fourth cylinder is connected to the push rod. A storage box is mounted on one end of the second cantilever beam and is located directly below the push rod.

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