A turntable screw riveting assembly line

Abstract

The present invention relates to the field of riveting equipment, in particular to a turntable screw riveting assembly line, wherein lifting mechanisms are provided at both ends of a lower conveyor belt, a rotating table is rotatably provided below a rotating support, riveting mechanisms are evenly spaced on the side of the rotating table, a screw feeder is provided at a nailing station, the screw feeder is arranged directly below the movement track of the riveting mechanism, a downward pressing cylinder is provided directly above the nailing station on the rotating support, a riveting cylinder is provided directly above the riveting station on the rotating support, a workpiece transfer station is provided with a workpiece transfer mechanism, upper conveyors are provided on both sides of the workpiece transfer mechanism, a mobile platform is provided on the workpiece transfer mechanism, a receiving space is provided in the mobile platform, a riveting lower die and an upward pushing cylinder are provided in the receiving space. The rotating table enables the riveting mechanism to reciprocate above the screw feeder and the riveting station, and the riveting mechanism performs riveting operations on the workpiece, and can automatically rivet the workpiece, thereby improving production efficiency and yield rate.

Description

Technical Field

[0001] The invention relates to the field of riveting equipment, in particular to a turntable screw riveting assembly line. Background Art

[0002] At present, in the processing of sheet metal workpieces, screws are often required for riveting and fixing. In the prior art, ring screws are assembled manually, and the product is operated with a rivet gun to fix the ring screws to the workpiece. With this installation method, the operator squeezes the ring screws for a long time, and the thumb is stressed, which is easy to be injured. The ring screws have requirements for the installation direction, and the riveting holes need to be aligned for riveting and pressing operations during riveting, which affects the production speed. Summary of the invention

[0003] The object of the present invention is to provide a turntable screw riveting assembly line to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a turntable screw riveting assembly line, comprising a workbench, a jig for loading workpieces and a punching mechanism, the jig is provided with positioning holes, a lower conveyor belt is provided under the workbench, and lifting mechanisms are provided at both ends of the lower conveyor belt. A workpiece transfer station, a riveting station and a nailing station are provided on the upper surface of the workbench, a workpiece transfer station is provided on one side of the riveting station, and a nailing station is provided on the other side of the riveting station; a rotating support is provided above the workbench through a column frame, a rotating table is rotatably connected below the rotating support, riveting mechanisms are evenly spaced on the side of the rotating table, and a riveting mechanism for A driving mechanism for driving the rotary table to rotate, the rotary table is arranged above the riveting station and the nailing station; the nailing station is provided with a screw feeder, the screw feeder is arranged directly below the movement trajectory of the riveting mechanism, the rotating support is provided with a downward pressure cylinder directly above the nailing station, and the rotating support is provided with a riveting cylinder directly above the riveting station; the workpiece transfer station is provided with a workpiece displacement conveying mechanism, the workpiece displacement conveying mechanism is provided with a mobile platform, a accommodating space is provided in the mobile platform, a riveting lower die is provided in the accommodating space, the riveting lower die is connected to an upward push cylinder, upper conveyor belts are provided on both sides of the workpiece displacement conveying mechanism, and the stamping mechanism is provided on the side of the upper conveyor belt away from the workpiece displacement conveying mechanism. The stamping mechanism is used for automatic loading and unloading and for performing stamping processes on the workpiece. The lifting mechanism is used for driving the workpiece to rise and fall and to move the workpiece to a predetermined position. The upper conveyor belt is used for driving the workpiece to move horizontally to a predetermined position. The lower conveyor belt is used for driving the workpiece to move horizontally to a predetermined position. The mobile platform can support the workpiece. The workpiece transfer station is used to drive the mobile platform to move horizontally. The push-up cylinder is used to drive the riveting lower die to rise. The riveting mechanism is used to absorb rivets. The screw feeder is used to screw the riveting mechanism. The downward pressing cylinder is used to drive the riveting mechanism to press downward.

[0005] The riveting mechanism includes a riveting support, a baffle, a pipe sleeve, a rivet rod, a riveting sleeve, a convex ring, a spring, and also includes a first fixed head or a second fixed head. The riveting support and the baffle are fixedly arranged on the side of the rotating table. The baffle is arranged directly above the riveting support. The riveting support is provided with a rivet rod through the pipe sleeve. The upper end of the rivet rod is connected with a riveting sleeve. The outer wall of the rivet rod is circumferentially provided with a convex ring. The outer sleeve of the rivet rod between the convex ring and the pipe sleeve is provided with a spring. The lower end of the rivet rod is connected with the first fixed head or the second fixed head. The downward pressure cylinder and the riveting cylinder are used to drive the rivet rod to press down. The baffle is used to block the convex ring. The rivet rod is reset by the spring after being pressed down.

[0006] The first fixing head includes a rivet pressing head and a pneumatic joint. A cavity is provided inside the rivet rod, and a pneumatic joint connected to the cavity is provided on the side wall of the rivet rod. A rivet pressing head is integrally formed at the lower end of the rivet rod, and an air passage connected to the cavity is provided on the rivet pressing head. The central axis of the rivet pressing head coincides with the central axis of the rivet rod. The pneumatic joint is used to connect to a vacuum device, the cavity of the rivet rod generates negative pressure, and the air passage of the rivet pressing head generates suction to adsorb the screw.

[0007] The second fixing head includes a fixing head mounting plate, a pneumatic finger and a pair of clamping claws. The lower end of the rivet rod is integrally connected with the fixing head mounting plate. The lower end surface of the fixing head mounting plate is fixedly connected with the pneumatic finger. The pneumatic finger is provided with a clamping claw for clamping the screw. The pneumatic finger is fixed on the fixing head mounting plate. The clamping claw is used to clamp the screw. The pneumatic finger is used to drive the clamping claw to open and close to clamp the screw.

[0008] The screw feeders are evenly spaced and arranged on the workbench in an arc shape. The feeding is performed by multiple screw feeders, thereby improving the feeding efficiency.

[0009] The rotating support is provided with a limit cylinder, and a plurality of positioning sleeves are fixedly provided on the rotating table along the circumference, and the positioning sleeves are clearance-matched with the piston rod of the limit cylinder. The piston rod of the limit cylinder extends into the positioning sleeve to prevent the rotating table from rotating during the riveting operation, thereby ensuring the smooth riveting operation.

[0010] The lifting mechanism includes a lifting bracket, a lifting cylinder, a telescopic rod, a supporting plate and a lifting conveyor belt. The upper surface of the lifting bracket is provided with a telescopic rod, the upper end of the telescopic rod is provided with a supporting plate, the supporting plate is provided with a lifting conveyor belt, the lifting bracket is provided with a lifting cylinder, the piston rod of the lifting cylinder abuts against the supporting plate, and the upper conveyor belt is arranged directly above the lower conveyor belt. The lifting cylinder drives the supporting plate to rise and fall, and the lifting cylinder drives the supporting plate to fall to a predetermined position, and the lifting conveyor belt is flush with the lower conveyor belt. When the lifting conveyor belt works, the jig on the lifting conveyor belt is transported to the lower conveyor belt.

[0011] The mobile platform includes a mobile support and a mobile conveyor belt. The mobile support is provided with a mobile conveyor belt. A cutting slit is provided on the surface of the mobile conveyor belt along the conveying direction. The riveting lower die and the cutting slit are clearance-matched, and the jig and the cutting slit are interference-matched. The jig is placed on the mobile conveyor belt. The mobile support is provided with a receiving space. The upward push cylinder and the riveting lower die are received in the receiving space. The upward push cylinder pushes the riveting lower die to rise. After the riveting lower die passes through the cutting slit, it abuts against the jig to provide support.

[0012] The mobile platform also includes a micro cylinder and a limit block. The micro cylinder is arranged in the accommodation space. The piston rod of the micro cylinder is connected to the limit block. The limit block penetrates the riveting lower die. The lower end surface of the fixture is provided with a limit groove corresponding to the limit block. The push-up cylinder is used to drive the riveting lower die to rise. The micro cylinder makes the limit block rise and embed into the riveting lower die to limit the position of the riveting lower die. The piston rod of the push-up cylinder abuts against the riveting lower die. The push-up cylinder can push the riveting lower die to rise. The riveting lower die rises and abuts against the fixture.

[0013] The workpiece conveying mechanism includes a first ball screw module, a support plate, a second ball screw module and a mounting plate. The workbench is provided with the first ball screw module, the first ball screw module is provided with a support plate, the support plate is provided with the second ball screw module, the second ball screw module is provided with a mounting plate, the push-up cylinder is fixed on the mounting plate, and a positioning groove is concavely provided on the upper surface of the mounting plate corresponding to the mobile platform. The first ball screw module cooperates with the second ball screw module to enable the mobile platform to move horizontally, which is convenient for adjusting the position of the mobile platform.

[0014] The working principle of the present invention is as follows: a punching mechanism is arranged on one side of the workpiece transfer station, and a lifting mechanism and an upper conveyor belt are respectively arranged at both ends of the punching mechanism. The workpiece is placed on a lifting mechanism, and the workpiece is pushed up to the feeding port of the punching mechanism by the lifting mechanism. After the punching mechanism performs a punching process on the workpiece, the mobile platform moves to the workpiece transfer station through the workpiece displacement mechanism. After the workpiece performs the punching process, the workpiece is transported to the mobile platform through an upper conveyor belt. The mobile platform moves horizontally to the riveting station through the workpiece displacement mechanism. The rotation of the rotating table drives the riveting mechanism to rotate. When the riveting mechanism rotates to the nailing station, the downward pressing cylinder pushes the riveting mechanism downward to load the material through the screw feeder. When the riveting mechanism rotates to a predetermined position, the riveting cylinder pushes the riveting mechanism downward to perform the riveting process. After the riveting process, the workpiece moves horizontally to the workpiece transfer station through the workpiece displacement mechanism. The workpiece after the riveting process is transported to another lifting mechanism through another upper conveyor belt, and the lifting mechanism transports the workpiece to the lower conveyor belt.

[0015] The beneficial effects of the present invention are as follows: the upper conveyor belt realizes the movement of the workpiece, the rotating table enables the riveting mechanism to reciprocate above the screw feeder and the riveting station, the riveting mechanism performs riveting operations on the workpiece, and can realize automatic riveting operations on the workpiece on the fixture, and the lower conveyor belt and the lifting mechanism cooperate to send the unfixed fixture back to the loading position, thereby improving production efficiency and yield rate and reducing labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings further illustrate the present invention, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0017] Figure 1 A schematic diagram of the structure of a turntable screw riveting assembly line provided by an embodiment of the present invention; Figure 2 A top view of a turntable screw riveting assembly line provided by an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of the structure of a riveting mechanism provided by an embodiment of the present invention;

[0019] Figure 4 A schematic diagram of the structure of a riveting mechanism provided by an embodiment of the present invention;

[0020] Figure 5 A schematic structural diagram of a first fixing head provided in one embodiment of the present invention;

[0021] Figure 6 A schematic diagram of the structure of a lifting mechanism provided by an embodiment of the present invention;

[0022] Figure 7 A schematic diagram of the structure of a mobile platform provided by an embodiment of the present invention;

[0023] Figure 8 A schematic diagram of the structure of a workpiece transfer mechanism provided by an embodiment of the present invention;

[0024] Fig. 9 A schematic diagram of the structure of a lower conveyor belt provided by an embodiment of the present invention;

[0025] Fig.10 A schematic diagram of the structure of an upper conveyor belt provided by an embodiment of the present invention;

[0026] Fig.11 A schematic structural diagram of a stamping mechanism provided in one embodiment of the present invention.

[0027] Markings in the figure: workbench 1, rotating support 201, rotating table 202, driving mechanism 203, limiting cylinder 204, lower conveyor belt 3, lifting mechanism 4, riveting mechanism 5, lower pressing cylinder 6, riveting cylinder 7, screw feeder 8, upper conveyor belt 9, work shifting mechanism 10, mobile platform 11, riveting lower die 12, fixture 13, manipulator 14, punching mechanism 15; riveting support 501, baffle 502, pipe sleeve 503, rivet rod 504, riveting sleeve 505, convex ring 506, spring 507, first fixed head 508, second fixed head 509;

[0028] Lifting cylinder 401, telescopic rod 402, supporting plate 403, lifting conveyor belt 404;

[0029] Movable bracket 1101 , movable conveyor belt 1102 , micro cylinder 1103 , limit block 1104 , cutting seam 1105 . DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element at the same time, and the directional words used, such as "upper, lower, left, right" generally refer to the other element. Figure 1 "Inside and outside" refer to the inside and outside of a specific outline. "Far and near" refer to the far and near relative to a certain component.

[0032] like Figure 1-Figure 11As shown in, a turntable screw riveting assembly line provided by an embodiment of the present invention comprises a workbench 1, a jig 13 for loading workpieces and a punching mechanism 15, a positioning hole is opened on the jig 13, a lower conveyor belt 3 is arranged below the workbench 1, and lifting mechanisms 4 are arranged at both ends of the lower conveyor belt 3. A workpiece transfer station, a riveting station and a nailing station are arranged on the upper surface of the workbench 1, a rotating support 201 is arranged above the workbench 1 through a column frame, a rotating table 202 is rotatably connected to the lower part of the rotating support 201, and riveting mechanisms 5 are evenly spaced on the side of the rotating table 202, and a driving mechanism 203 for driving the rotating table 202 to rotate is arranged on the upper surface of the rotating support 201, and the riveting station and the nailing station are arranged on the rotating table 2 02 below, the workpiece transfer station is arranged on the side of the riveting station away from the nailing station, the nailing station is provided with a screw feeder 8, the screw feeder 8 is arranged directly below the movement trajectory of the riveting mechanism 5, the rotating support is provided with a downward pressure cylinder 6 directly above the nailing station, the rotating support 201 is provided with a riveting cylinder 7 directly above the riveting station, the workpiece transfer station is provided with a workpiece displacement conveying mechanism 10, the workpiece displacement conveying mechanism 10 is provided with a mobile platform 11, the mobile platform 11 is provided with a accommodating space, the accommodating space is provided with an upward push cylinder and a riveting lower die 12, the upward push cylinder is connected to the riveting lower die 12, upper conveyor belts 9 are provided on both sides of the workpiece displacement conveying mechanism 10, and the stamping mechanism 15 is arranged on the side of the upper conveyor belt 9 away from the workpiece displacement conveying mechanism 10. The punching mechanism 15 is used for automatically loading and unloading materials and performing a punching process on the workpiece. The lifting mechanism 4 is used to drive the workpiece to rise and fall and drive the workpiece to move to a predetermined position. The upper conveyor belt 9 is used to drive the workpiece to move horizontally to a predetermined position. The lower conveyor belt 3 is used to drive the workpiece to move horizontally to a predetermined position. The mobile platform 11 can support the workpiece. The workpiece transfer station is used to drive the mobile platform 11 to move horizontally. The push cylinder is used to drive the riveting lower die 12 to rise. The riveting mechanism 5 is used to adsorb rivets. The screw feeder 8 is used to screw the riveting mechanism 5. The pressing cylinder 6 is used to drive the riveting mechanism 5 to press down. Thin cylinders are used as the pressing cylinder 6 and the riveting cylinder 7. The thin cylinder is small in size and can push the rivet rod 504 to press down. The riveting lower die 12 and the fixture 13 are both plate structures. A through hole is provided on the fixture 13 corresponding to the riveting position of the workpiece, and a cylindrical support column is embedded on the upper surface of the riveting lower die 12 corresponding to the riveting position of the workpiece.

[0033] A manipulator 1414 is provided on the workbench 1 for carrying workpieces for loading and unloading operations. Belts are provided on both sides of the lower die of the stamping mechanism 15, and a positioning hole is opened on the fixture 13. A photoelectric sensor is installed on the lower die of the stamping mechanism 15, and the fixture 13 is positioned by the photoelectric sensor and the positioning hole.

[0034] The riveting mechanism 5 includes a riveting support 501, a baffle 502, a sleeve 503, a rivet rod 504, a riveting sleeve 505, a convex ring 506, a spring 507, and also includes a first fixed head 508 and a second fixed head 509. The riveting support 501 and the baffle 502 are fixedly provided on the side of the rotating table 202. The baffle 502 is arranged directly above the riveting support 501. The riveting support 501 is movably provided with a rivet rod 504 through the sleeve 503. The upper end of the rivet rod 504 is connected to the riveting sleeve 505. The outer wall of the rivet rod 504 is circumferentially provided with a convex ring 506. The convex ring 506 and the rivet rod 504 are integrally formed. The outer sleeve of the rivet rod 504 between the convex ring 506 and the sleeve 503 is provided with a spring 507. The lower end of the rivet rod 504 is connected to the first fixed head 508 or the second fixed head 509. The pressing cylinder 6 and the riveting cylinder 7 are used to drive the rivet rod 504 to be pressed downward, and the baffle 502 is used to block the convex ring 506. After the rivet rod 504 is pressed downward, it is reset by the spring 507.

[0035] The first fixing head 508 includes a rivet pressing head and a pneumatic joint. A cavity is provided inside the rivet rod 504. A pneumatic joint connected to the cavity is provided on the side wall of the rivet rod 504. A rivet pressing head is integrally formed at the lower end of the rivet rod 504. The rivet pressing head is provided with an air passage connected to the cavity. The central axis of the rivet pressing head coincides with the central axis of the rivet rod 504. The pneumatic joint is used to connect to a vacuum device. The cavity of the rivet rod 504 generates negative pressure, and the air passage of the rivet pressing head generates suction to adsorb the screw.

[0036] The second fixed head 509 includes a fixed head mounting plate, a pneumatic finger and a pair of clamping claws. The lower end of the rivet rod 504 is integrally connected with the fixed head mounting plate. The lower end surface of the fixed head mounting plate is fixedly connected with the pneumatic finger. The pneumatic finger is provided with a clamping claw for clamping the screw. The pneumatic finger is fixed on the fixed head mounting plate. The clamping claw is used to clamp the screw. The pneumatic finger is used to drive the clamping claw to open and close to clamp the screw. The clamping claw is used to clamp the screw. The clamping claw can be realized by any existing technology.

[0037] The screw feeders 8 are evenly spaced and arranged in an arc shape on the workbench 1. The feeding is performed by multiple screw feeders 8 to improve the feeding efficiency.

[0038] The rotating support 201 is provided with a limit cylinder 204, and the rotating table 202 is fixedly provided with a plurality of positioning sleeves along the circumferential direction, and the positioning sleeves are clearance-matched with the piston rod of the limit cylinder 204. The piston rod of the limit cylinder 204 extends into the positioning sleeve to prevent the rotating table 202 from rotating during the riveting operation, thereby ensuring the smooth riveting operation.

[0039] The lifting mechanism 4 includes a lifting bracket, a lifting cylinder 401, a telescopic rod 402, a supporting plate 403 and a lifting conveyor belt 404. The upper surface of the lifting bracket is provided with a telescopic rod 402, and the upper end of the telescopic rod 402 is provided with a supporting plate 403. The supporting plate 403 is provided with a lifting conveyor belt 404. The lifting bracket is provided with a lifting cylinder 401, and the piston rod of the lifting cylinder 401 abuts against the supporting plate 403. The upper conveyor belt 9 is arranged directly above the lower conveyor belt 3. The lifting cylinder 401 drives the supporting plate 403 to rise and fall, and the lifting cylinder 401 drives the supporting plate 403 to fall to a predetermined position. The lifting conveyor belt 404 is flush with the lower conveyor belt 3, and the lifting conveyor belt 404 works to transport the jig 13 on the lifting conveyor belt 404 to the lower conveyor belt 3.

[0040] The mobile platform 11 includes a mobile support 1101 and a mobile conveyor belt 1102. The mobile support 1101 is provided with a mobile conveyor belt. A cutting slit 1105 is provided on the surface of the mobile conveyor belt along the conveying direction. The riveting lower die 12 is clearance-matched with the cutting slit 1105, and the jig 13 is interference-matched with the cutting slit 1105. The jig 13 is placed on the mobile conveyor belt. The mobile support 1101 is formed with a receiving space. The mobile support 1101 is an n-shaped structure. The upward push cylinder and the riveting lower die 12 are accommodated in the receiving space. The upward push cylinder pushes the riveting lower die 12 to rise. After the riveting lower die 12 passes through the cutting slit 1105, it abuts against the jig 13 to provide support.

[0041] The mobile platform 11 also includes a micro cylinder 1103 and a limit block 1104. The micro cylinder 1103 is fixedly arranged in the accommodation space. The piston rod of the micro cylinder 1103 is connected to the limit block 1104. The upper end of the limit block 1104 penetrates the riveting lower die 12. The lower end surface of the fixture 13 is provided with a limit groove corresponding to the limit block 1104. The push-up cylinder is used to drive the riveting lower die 12 to rise. The micro cylinder 1103 makes the limit block 1104 rise and embed into the riveting lower die 12 to limit the position of the riveting lower die 12. The piston rod of the push-up cylinder abuts against the riveting lower die 12. The push-up cylinder can push the riveting lower die 12 to rise, and the riveting lower die 12 rises and abuts against the fixture 13.

[0042] The workpiece conveying mechanism 10 includes a first ball screw module, a support plate, a second ball screw module and a mounting plate. The workbench 1 is provided with a first ball screw module, a support plate is provided on the first ball screw module, a second ball screw module is provided on the support plate, a mounting plate is provided on the second ball screw module, an upward push cylinder is fixed on the mounting plate, and a positioning groove is concavely provided on the upper surface of the mounting plate corresponding to the mobile platform 11. The first ball screw module cooperates with the second ball screw module to enable the mobile platform 11 to move horizontally, which is convenient for adjusting the position of the mobile platform 11.

[0043] Before assembly, the operator places the jig 13 without the workpiece on the mobile conveyor belt 1102, connects the pneumatic joint to the vacuum generator, puts the screws into the screw feeder 8, and then starts and debugs the equipment. The workpiece transfer mechanism 10 moves the mobile platform 11 between the two upper conveyor belts 9, and the lifting mechanism 4 raises the lifting conveyor belt 404 to be flush with the upper conveyor belt 9, and moves the workpiece to the bottom of the manipulator 14. The manipulator 14 grabs the workpiece and places the workpiece on the jig 13, and places the jig 13 and the workpiece on the mobile conveyor belt 1102 of the lifting mechanism 4. The lifting conveyor belt 404 transports the jig 13 and the workpiece to the stamping press. At mechanism 15, the punching mechanism 15 performs a punching operation on the workpiece. After the punching is completed, the jig 13 carrying the semi-finished workpiece is transported to the upper conveyor belt 9. The upper conveyor belt 9 transports the jig 13 and the workpiece to the mobile conveyor belt 1102. The micro cylinder 1103 is actuated to push the limit block 1104 into the limit groove of the jig 13. The workpiece displacement mechanism moves the mobile platform 11 to a predetermined position below the riveting cylinder 7. The rotating table 202 rotates to transport the riveting mechanism 5 with the screws grasped to the bottom of the riveting cylinder 7. The riveting cylinder 7 is actuated to push the riveting sleeve 505 to rivet the workpiece and the screws at the lower end of the riveting mechanism 5 together. The rotating table 202 rotates to transport the riveting mechanism 5 to the top of the screw feeder 8. The screw feeder 8 arranges the rivets and transports them to the position where the riveting mechanism 5 grabs the rivets. The pressing cylinder 6 acts to push the first fixed head 508 or the second fixed head 509 at the lower end of the riveting mechanism 5 downward. The first fixed head 508 descends to absorb the screws and rises under the action of the spring 507. The second fixed head 509 descends to grab the screws and rises under the action of the spring 507. Then, the rotating table 202 transports the riveting mechanism 5 with the screws grabbed to the bottom of the riveting cylinder 7. After the riveting process of the workpiece is completed, the workpiece transfer mechanism 10 moves the mobile platform 11 between the two upper conveyor belts 9, the micro cylinder 1103 is actuated to pull the limit block 1104 out of the limit groove of the fixture 13, and the mobile conveyor belt 1102 transports the fixture 13 carrying the workpiece to the upper conveyor belt 9, and the upper conveyor belt 9 transports the fixture 13 and the workpiece to the lifting conveyor belt 404. The operator only needs to put the workpiece into the corresponding container, and the lifting mechanism 4 lowers the lifting conveyor belt 404 to be flush with the lower conveyor belt 3, and the lifting conveyor belt 404 transports the fixture 13 without the workpiece placed on it to another lifting conveyor belt 404. The other lifting mechanism 4 drives the lifting conveyor belt 404 to rise, and the lifting conveyor belt 404 transports the fixture 13 without the workpiece placed on it to the place where the robot 14 puts down the workpiece.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A turntable screw riveting assembly line, comprising a workbench, a jig for loading workpieces and a punching mechanism, wherein a positioning hole is provided on the jig, and the characteristics are: A lower conveyor belt is provided below the workbench, and lifting mechanisms are provided at both ends of the lower conveyor belt. A workpiece transfer station, a riveting station and a nailing station are provided on the upper surface of the workbench. A workpiece transfer station is provided on one side of the riveting station, and a nailing station is provided on the other side of the riveting station. A rotating support is provided above the workbench through a column frame, and a rotating table is rotatably connected below the rotating support. Riveting mechanisms are evenly spaced on the side of the rotating table, and a driving mechanism for driving the rotating table to rotate is provided on the upper surface of the rotating support. The rotating table is set at the riveting station and the nailing station Above; the nailing station is provided with a screw feeder, which is arranged just below the movement track of the riveting mechanism, the rotating support is provided with a pressing cylinder just above the nailing station, and the rotating support is provided with a riveting cylinder just above the riveting station; the workpiece transfer station is provided with a workpiece displacement conveying mechanism, the workpiece displacement conveying mechanism is provided with a mobile platform, a containing space is provided in the mobile platform, a riveting lower die is provided in the containing space, the riveting lower die is connected with an upward push cylinder, upper conveyor belts are provided on both sides of the workpiece displacement conveying mechanism, and the upward push cylinder is used to drive the riveting lower die to rise; The lifting mechanism includes a lifting bracket, a lifting cylinder, a telescopic rod, a supporting plate and a lifting conveyor belt. The upper surface of the lifting bracket is provided with a telescopic rod, the upper end of the telescopic rod is provided with a supporting plate, the supporting plate is provided with a lifting conveyor belt, the lifting bracket is provided with a lifting cylinder, the piston rod of the lifting cylinder abuts against the supporting plate, and the upper conveyor belt is arranged directly above the lower conveyor belt; The mobile platform comprises a mobile bracket and a mobile conveyor belt, the mobile bracket is provided with a mobile conveyor belt, a cutting slit along the conveying direction is opened on the surface of the mobile conveyor belt, the riveting lower die is clearance-matched with the cutting slit, and the jig is interference-fitted with the cutting slit, the mobile platform also comprises a micro-cylinder and a limit block, a micro-cylinder is arranged in the accommodating space, the piston rod of the micro-cylinder is connected to the limit block, the limit block passes through the riveting lower die, and a limit groove is arranged on the lower end surface of the jig corresponding to the limit block, the work shifting mechanism comprises a first ball screw module, a support plate, a second ball screw module and a mounting plate, a first ball screw module is arranged on the workbench, a support plate is arranged on the first ball screw module, a second ball screw module is arranged on the support plate, a mounting plate is arranged on the second ball screw module, an upward push cylinder is fixedly arranged on the mounting plate, and a positioning groove is concavely arranged on the upper surface of the mounting plate corresponding to the mobile platform; A stamping mechanism is arranged on one side of the workpiece transfer station, and a lifting mechanism and an upper conveyor belt are arranged at both ends of the stamping mechanism respectively. The workpiece is placed on a lifting mechanism, and the workpiece is pushed up to the feed port of the stamping mechanism by the lifting mechanism. After the stamping mechanism performs the stamping process on the workpiece, the mobile platform moves to the workpiece transfer station through the workpiece displacement mechanism. After the workpiece performs the stamping process, the workpiece is transported to the mobile platform through an upper conveyor belt. The mobile platform moves horizontally to the riveting station through the workpiece displacement mechanism. The rotation of the rotary table drives the riveting mechanism to rotate. When the riveting mechanism rotates to the nailing station, the downward pressing cylinder pushes the riveting mechanism downward to load the material through the screw feeder. When the riveting mechanism rotates to the predetermined position, the riveting cylinder pushes the riveting mechanism downward to perform the riveting process. After the riveting process, the workpiece moves horizontally to the workpiece transfer station through the workpiece displacement mechanism. The workpiece after the riveting process is transported to another lifting mechanism through another upper conveyor belt, and the lifting mechanism transports the workpiece to the lower conveyor belt.

2. The turntable screw riveting assembly line according to claim 1 is characterized in that: The riveting mechanism includes a riveting support, a baffle, a pipe sleeve, a rivet rod, a riveting sleeve, a convex ring, a spring, and also includes a first fixed head or a second fixed head. The riveting support and the baffle are fixedly arranged on the side of the rotating table. The baffle is arranged directly above the riveting support. The riveting support is movably provided with a rivet rod through the pipe sleeve. The upper end of the rivet rod is connected with the riveting sleeve. A convex ring is circumferentially arranged on the outer wall of the rivet rod. A spring is arranged on the outer sleeve of the rivet rod between the convex ring and the pipe sleeve. The lower end of the rivet rod is connected to the first fixed head or the second fixed head.

3. The turntable screw riveting assembly line according to claim 2 is characterized in that: The first fixing head includes a rivet press head and a pneumatic joint. A cavity is provided inside the rivet rod. A pneumatic joint connected to the cavity is provided on the side wall of the rivet rod. A rivet press head is integrally formed at the lower end of the rivet rod. The rivet press head is provided with an air passage connected to the cavity. The central axis of the rivet press head coincides with the central axis of the rivet rod.

4. The turntable screw riveting assembly line according to claim 2 is characterized in that: The second fixing head includes a fixing head mounting plate, a pneumatic finger and a pair of clamping claws. The lower end of the rivet rod is integrally connected with the fixing head mounting plate. The lower end surface of the fixing head mounting plate is fixedly connected with the pneumatic finger. The pneumatic finger is provided with a clamping claw for clamping the screw.

5. The turntable screw riveting assembly line according to claim 2 is characterized in that: The screw feeders are evenly spaced and arranged on the workbench in an arc shape.

6. The turntable screw riveting assembly line according to claim 1, characterized in that: The rotating support is provided with a limiting cylinder, and a plurality of positioning sleeves are fixedly provided along the circumference of the rotating table, and the positioning sleeves are clearance-matched with the piston rod of the limiting cylinder.

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