Robot riveting workbench

Abstract

This invention discloses a robotic riveting workbench, comprising a base with four sets of parallel slide rails. A first column is slidably connected to each of the two outer sets of slide rails, and a second column is slidably connected to each of the two inner sets of slide rails. A first positioning fixture is connected between two first columns, and a second positioning fixture is connected between two second columns. The base also includes a first drive mechanism and a second drive mechanism for driving the first and second columns to slide along the slide rails. Each drive mechanism includes two ball screws, a drive motor that drives the two ball screws to rotate simultaneously, a hollow reducer, a transmission rod, and two commutators. A drive device for rotating the positioning fixture is located inside the column. The base is equipped with a liftable guardrail, and casters are located at the bottom of the base. This invention is suitable for automated robotic production, offering high safety, high efficiency, and precise, variable positioning with human-machine separation.

Description

Technical fields:

[0001] This invention belongs to the field of automation equipment technology, specifically a workbench for robotic riveting. Background technology:

[0002] In industries such as automobile manufacturing, some products have thin outer walls, making it difficult to weld nuts or tap internal threads. Therefore, rivet nuts are used, as this method offers strong, efficient, and convenient connections. Riveting nuts can be done by robots or manually. Due to the high cost of manual labor, manufacturers prefer to use robots for riveting while manually loading and unloading materials to save costs. However, existing riveting workbenches combined with robotic riveting still have the following problems: 1. The lack of human-machine separation leads to low safety; improper operation can cause danger. 2. During manual loading and unloading, the robot must stop riveting to wait for manual material removal and clamping, resulting in low efficiency. 3. Positioning is inaccurate; there is no displacement function, making it impossible to rivet all holes on workpieces of different sizes and with different rivet hole positions. Summary of the Invention

[0003] In view of the above background, the present invention provides a robotic riveting workbench that features high safety, high efficiency, precise positioning, and the ability to perform displacement and is suitable for different workpieces.

[0004] This invention is achieved through the following technical solution:

[0005] A robotic riveting workbench includes a base, characterized in that four sets of slide rails are arranged in parallel on the base; a first column is slidably connected to each of the two outer sets of slide rails, and a second column is slidably connected to each of the two inner sets of slide rails; a first positioning fixture is connected between two first columns, and a second positioning fixture is connected between two second columns; the base is also provided with a first driving mechanism and a second driving mechanism for driving the first and second columns to slide along the slide rails; the vertical height of the first column is higher than the height of the second column, and the second column and the second positioning fixture can pass through the space below the first positioning fixture;

[0006] The first drive mechanism and the second drive mechanism have the same structure. Each drive mechanism includes two bidirectional ball screws and a drive motor that drives the screws of the two ball screws to rotate simultaneously. Each ball screw includes a screw and a nut, and the two ends of the screw are rotatably fixed on the machine base. The nuts of the two ball screws on the first drive mechanism are fixedly connected to the bottom of the two first columns respectively. The nuts of the two ball screws on the second drive mechanism are fixedly connected to the bottom of the two second columns respectively.

[0007] Preferably, each drive mechanism further includes a hollow reducer, a transmission rod, and two commutators; the output end of the drive motor is connected to the hollow reducer; the hollow reducer is connected to the middle of the transmission rod, the two ends of the transmission rod are respectively connected to the input ends of the two commutators, and the output ends of the two commutators are respectively connected to one end of the two ball screws through two flexible couplings. The drive motor drives the transmission rod to rotate, and the commutators redirect the power of the transmission rod to the ball screws.

[0008] Preferably, the first positioning fixture and the second positioning fixture have the same structure. Each positioning fixture includes a crossbeam, and a clamping assembly is provided on the crossbeam. The clamping assembly includes a stop block, a clamping cylinder that presses the workpiece against one side of the stop block, a spinning cylinder that presses the workpiece against the crossbeam, and pneumatic switch manual valves for controlling the spinning cylinder and the clamping cylinder respectively. The spinning cylinder and the stop block are located on the same side of the crossbeam.

[0009] Preferably, the two ends of the first positioning fixture are rotatably connected to two first columns, and the first column is provided with a first driving device for driving the first positioning fixture to rotate. The two ends of the second positioning fixture are rotatably connected to two second columns, and the second column is provided with a second driving device for driving the second positioning fixture to rotate.

[0010] Preferably, the machine base is also provided with a guardrail for separating the first positioning fixture and the second positioning fixture, and a lifting device for driving the guardrail to rise and fall. The lifting device includes two vertically arranged guide columns, and rollers that slide up and down along the guide columns are provided on the left and right sides of the guardrail. A lifting cylinder is fixed on each of the two guide columns, and the piston rod end of the lifting cylinder is connected to the guardrail.

[0011] Preferably, the base is provided with multiple horizontally adjustable support casters.

[0012] In use, two drive motors control the first positioning fixture and the second fixture to slide along the slide rail, respectively. Power is transmitted from the drive motors to the reducer, then to both ends of the transmission rod, and finally to two bidirectional ball screws via two steering gears. The ball screws convert rotary motion into linear motion, causing the two columns at both ends of the positioning fixture to move simultaneously. This structure is more precise and durable.

[0013] When the robot performs riveting, the manual and robot workstations are located on opposite sides of a guardrail. The guardrail lowers, separating the first and second positioning fixtures, allowing for safe loading and unloading by the operator. After riveting is completed, the guardrail rises, and the positions of the two positioning fixtures are exchanged.

[0014] The drive unit inside the column can drive the positioning fixture to rotate, and together with the robot, it can complete the riveting of holes in different positions.

[0015] During manual clamping, the workpiece is placed against the baffle, and the clamping cylinder and spinning cylinder are activated sequentially using a pneumatic switch and manual valve to clamp the workpiece. The casters at the bottom of the machine base allow for adjustment of the worktable position, making it more suitable for robotic applications.

[0016] The advantages of this invention are: it is suitable for use with industrial robots to achieve automated production, it is highly safe and efficient, precise and durable, and can adapt to different workpieces and rivet holes. Attached Figure Description

[0017] Figure 1 This is a front view of the present invention.

[0018] Figure 2 This is a top view of the present invention.

[0019] Figure 3 This is a schematic diagram of the drive mechanism and slide rail of the present invention.

[0020] Figure 4 This is a schematic diagram of the positioning tooling of the present invention. Detailed Implementation

[0021] This invention provides a robotic riveting workbench, including a base 1 with six horizontally adjustable support casters 19 at the bottom; four sets of slide rails 2 are arranged parallel to each other on the base 1, with a first column 3 slidably connected to each of the two outer sets of slide rails 2, and a second column 4 slidably connected to each of the two inner sets of slide rails 2; a first positioning fixture 5 is connected between the two first columns 3, and a second positioning fixture 6 is connected between the two second columns 4; the base 1 is also provided with a first driving mechanism 7 and a second driving mechanism 8 for driving the first columns 3 and the second columns 4 to slide along the slide rails 2 respectively; the vertical height of the first column 3 is higher than the height of the second column 4, and the second column 4 and the second positioning fixture 6 can pass under the first positioning fixture 5;

[0022] The first drive mechanism 7 and the second drive mechanism 8 have the same structure. Each drive mechanism includes two bidirectional ball screws 9 and a drive motor 10 that drives the screws of the two ball screws 9 to rotate simultaneously. Each set of slide rails 2 includes two guide rails, and the ball screws 9 are arranged in parallel between the two guide rails of each set of slide rails 2. Each ball screw 9 includes a screw and a nut, and the two ends of the screw are rotatably fixed to the base 1 through bearing seats. The nuts of the two ball screws 9 on the first drive mechanism 7 are fixedly connected to the bottom of the two first columns 3 respectively. The nuts of the two ball screws 9 on the second drive mechanism 8 are fixedly connected to the bottom of the two second columns 4 respectively.

[0023] Each drive mechanism also includes a hollow reducer 11, a transmission rod 12, and two commutators 13; the output end of the drive motor 10 is connected to the hollow reducer 11; the hollow reducer 11 is fixedly connected to the middle of the transmission rod 12, and the two ends of the transmission rod 12 are respectively connected to the input ends of the two commutators 13 through flexible couplings, and the output ends of the two commutators 13 are respectively connected to one end of the two ball screws 9 through two flexible couplings. The drive motor 10 drives the transmission rod 12 to rotate, and the commutators 13 redirect the power of the transmission rod 12 to the ball screws 9.

[0024] The first positioning fixture 5 and the second positioning fixture 6 have the same structure. Each positioning fixture includes a crossbeam 14, on which a clamping assembly is provided. The clamping assembly includes a stop block 14.1, a clamping cylinder 14.2 that presses the workpiece against one side of the stop block 14.1, a spinning cylinder 14.3 that presses the workpiece against the crossbeam 14, and a pneumatic switch manual valve 14.4 for controlling the spinning cylinder 14.3 and the clamping cylinder 14.2 respectively. The spinning cylinder 14.3 and the stop block 14.1 are located on the same side of the crossbeam 14. The two ends of the first positioning fixture 5 are rotatably connected to two first columns 3 respectively. The first column 3 is provided with a first driving device for driving the first positioning fixture 5 to rotate. The two ends of the second positioning fixture 6 are rotatably connected to two second columns 4 respectively. The second column 4 is provided with a second driving device for driving the second positioning fixture 6 to rotate.

[0025] The base 1 is also provided with a guardrail 15 for separating the first positioning fixture 5 and the second positioning fixture 6 and a lifting device for driving the guardrail 15 to rise and fall. The lifting device includes two vertically arranged guide columns 16. Rollers 17 that roll up and down along the guide columns 16 are fixed on the left and right sides of the guardrail 15. A lifting cylinder 18 is fixed on each of the two guide columns 16. The piston rod end of the lifting cylinder 18 is connected to the guardrail 15.

[0026] All electrical structures involved in this invention are connected to a PLC controller to achieve automated control, which is a conventional technique in the field.

[0027] It will be apparent to those skilled in the art that the present invention can be modified in various ways, and such modifications are not considered to depart from the scope of the invention. All such modifications that are obvious to those skilled in the art are included within the scope of the claims of the present invention.

Claims

1. A robotic rivlug workstation comprising a bed, characterized in that, The four groups of slide rails are arranged in parallel on the base, two first vertical columns are slidably connected to the outer two groups of slide rails, two second vertical columns are slidably connected to the inner two groups of slide rails, a first positioning tool is connected between the two first vertical columns, and a second positioning tool is connected between the two second vertical columns; the first vertical columns are higher than the second vertical columns in vertical height, and the first positioning tool is lower than the second vertical columns and the second positioning tool. The first driving mechanism and the second driving mechanism are the same in structure, each driving mechanism comprises two bidirectional ball screws and a driving motor for simultaneously rotating the two ball screws, each ball screw comprises a screw rod and a nut, and the two ends of the screw rod are rotatably fixed to the base; the nuts of the two ball screws of the first driving mechanism are fixedly connected to the bottoms of the two first vertical columns; and the nuts of the two ball screws of the second driving mechanism are fixedly connected to the bottoms of the two second vertical columns.

2. The robotic rivlug station of claim 1, wherein, Each driving mechanism further comprises a hollow speed reducer, a transmission rod, and two reversers, the output end of the driving motor is connected with the hollow speed reducer, the hollow speed reducer is connected with the middle part of the transmission rod, the two ends of the transmission rod are respectively connected with the input ends of the two reversers, the output ends of the two reversers are respectively connected with one end of the two ball screws through two flexible couplings, and the driving motor drives the transmission rod to rotate, and the reversers transmit power to the ball screws after turning the power of the transmission rod.

3. The robotic rivlug station of claim 1, wherein, The first positioning tool and the second positioning tool are the same in structure, each positioning tool comprises a cross beam, the cross beam is provided with a clamping assembly, the clamping assembly comprises a stop block, a pressing cylinder for pressing a workpiece to one side of the stop block, a spinning cylinder for pressing the workpiece on the cross beam, and pneumatic on-off hand valves for controlling the spinning cylinder and the pressing cylinder respectively, and the spinning cylinder and the stop block are arranged on the same side of the cross beam.

4. The robotic rivlug station of claim 1, wherein, The two ends of the first positioning tool are rotatably connected with the two first vertical columns, the first vertical column is internally provided with a first driving device for driving the first positioning tool to rotate, the two ends of the second positioning tool are rotatably connected with the two second vertical columns, and the second vertical column is internally provided with a second driving device for driving the second positioning tool to rotate.

5. The robotic rivlug station of claim 1, wherein, The base is further provided with a guardrail for separating the first positioning tool and the second positioning tool and a lifting device for driving the guardrail to lift, the lifting device comprises two vertically arranged guide columns, the left and right sides of the guardrail are provided with rollers rolling up and down along the guide columns, one lifting cylinder is fixedly arranged on each guide column, and the piston rod of the lifting cylinder is connected with the guardrail.

6. The robotic rivlug station of claim 1, wherein, The bottom of the base is provided with a plurality of horizontal adjustment support casters.

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