Automatic hollow bolt conveying and detecting device

Abstract

An automatic hollow bolt conveying and detecting device comprises a rack, a straight vibrator fixed to the rack, a conveying rail arranged on the upper end face of the straight vibrator, a bolt picking device, a first air cylinder and a hollow bolt inner hole detecting device arranged on the rack and located between the conveying rail and a bolt clamping device. The hollow bolt inner hole detection device comprises a lifting support and a displacement sensor, the displacement sensor is installed on a bending arm at the upper end of the lifting support, the lower end of the lifting support is connected and fixed to a piston rod, extending upwards, of a second air cylinder, and the second air cylinder is installed on the rack and used for driving the lifting support to move up and down. The bolt picking device is arranged on the conveying rail, drives a measuring shaft of the displacement sensor to move up and down and is used for detecting the diameter of an inner hole of the hollow bolt conveyed on the conveying rail, and the bolt picking device is driven by a first air cylinder to convey qualified hollow bolts to a preset position or reject unqualified hollow bolts.

Description

Technical Field

[0001] The invention relates to the field of bolt conveying devices, and in particular to an automatic bolt conveying and picking device. Background Art

[0002] In the automobile manufacturing process, in order to achieve efficient and accurate assembly, it is usually necessary to use a robot to grasp and install a hollow bolt with both internal and external threads. This process requires a matching conveying device to convey the hollow bolt to a designated position where the robot can pick it up, so that the robot can complete the subsequent grasping, tightening and assembly operations.

[0003] In the prior art, CN115464383B discloses an automatic nail feeding device, which transfers the screws and drops them into the nail separator by the vibration of the straight vibrator, and then the double guide cylinder and the split track cylinder are displaced to accurately transport the screws in the nail separator to the starting working position of the screw clamp, and the screw clamp moves the screws to a position where the robot can pick them up; however, the device has the following shortcomings: 1. It is impossible to pick up hollow bolts whose inner hole specifications do not meet the standards; when the inner hole diameter of the hollow bolt does not meet the design standards, the parts that should be assembled in the inner hole of the hollow bolt in the subsequent production process will not be able to achieve normal thread matching with its internal thread, which will directly lead to assembly failure or substandard product performance.

[0004] 2. Lack of clamping detection function; the device cannot detect whether the hollow bolt is successfully clamped in the screw clamp. If the clamp fails to successfully clamp the bolt from the nail separator, the robot will not be able to pick up the bolt at the specified position, which will lead to problems such as missing installation or missing tightening, thus affecting the continuity of the assembly line and the quality of the finished product. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic conveying and detection device for hollow bolts in view of the corresponding deficiencies in the prior art; the device can detect the inner hole size of the hollow bolts, remove unqualified bolts, and convey qualified bolts, thereby effectively avoiding assembly problems caused by unqualified bolt sizes.

[0006] The objective of the present invention is achieved by adopting the following scheme: A hollow bolt automatic conveying and detection device comprises a frame, a straight vibrator fixed on the frame, a conveying rail arranged on the upper end surface of the straight vibrator, a bolt picking device, and a first cylinder. A hollow bolt inner hole detection device is arranged on the frame and is located between the conveying rail and the bolt clamping device. The hollow bolt inner hole detection device comprises a lifting bracket and a displacement sensor. The displacement sensor is installed on the bending arm at the upper end of the lifting bracket. The lower end of the lifting bracket is connected and fixed to a piston rod extending upward by a second cylinder. The second cylinder is installed on the frame and is used to drive the lifting bracket to move up and down, and drive the measuring axis of the displacement sensor to move up and down, so as to detect the inner hole diameter of the hollow bolt conveyed on the conveying rail. The bolt picking device is driven by the first cylinder to deliver qualified hollow bolts to a predetermined position or remove unqualified hollow bolts.

[0007] Preferably, the bolt picking device includes a clamp bracket and a pneumatic clamp, the clamp bracket slides and moves horizontally on the frame, the piston rod of the first cylinder is fixedly connected to the clamp bracket, and the pneumatic clamp is fixed on the clamp bracket, and is used to deliver qualified hollow bolts to a predetermined position.

[0008] Preferably, a detection device is provided on the bolt picking device corresponding to the pneumatic clamp, for detecting whether the pneumatic clamp holds a hollow bolt.

[0009] Preferably, the detection device is a photoelectric sensor.

[0010] Preferably, a counting sensor for counting the number of hollow bolts conveyed by the conveyor rail is provided on one side of the conveyor rail.

[0011] Preferably, a waste box is provided on the frame, and the waste box is located below the bolt clamping device.

[0012] Preferably, an air circuit control valve, a communication device and a controller are provided on the rack.

[0013] Preferably, the conveying rail is two support plates arranged in parallel, a groove is formed between the two support plates, and the width of the groove is greater than the diameter of the bolt rod and smaller than the diameter of the bolt head.

[0014] Preferably, the conveying rail comprises an entrance section, a connecting section and a conveying section. The entrance section and the conveying section are both arranged horizontally and connected via an inclined connecting section. The height of the entrance section is higher than that of the conveying section.

[0015] Preferably, a protective cover plate is provided above the conveying section.

[0016] The beneficial effects of the present invention are as follows: It can detect the inner hole size of hollow bolts, select hollow bolts whose inner hole diameter does not meet the design standards, and transport the hollow bolts whose inner hole diameter meets the design standards to the designated position where the robot can pick them up; it provides a clamping detection function to confirm whether the pneumatic clamp is holding the hollow bolt, effectively avoiding the problem of missing or missing hollow bolts due to the robot's inability to grasp the hollow bolt; the system is highly automated and intelligent, with high production efficiency and low defective rate, and is suitable for the needs of modern industrial assembly production lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 for Figure 1 A-direction structural schematic diagram; Figure 3 for Figure 1 Schematic diagram of the B-direction structure. DETAILED DESCRIPTION

[0018] like Figures 1 to 3 As shown, an automatic conveying and detecting device for hollow bolts comprises a frame 1, a straight vibrator 2 fixed on the frame 1, a conveying rail 3 arranged on the upper end surface of the straight vibrator 2, a bolt picking device, and a first cylinder 4; The straight vibrator 2 is mounted on the upper end surface of the frame 1 by screws. The conveying rail 3 is two parallel support plates 11, which are fixedly connected to the upper end surface of the straight vibrator 2 by screws. A groove is formed between the two support plates 11. The width of the groove is greater than the diameter of the bolt rod and less than the diameter of the bolt head. When conveying hollow bolts, the hollow bolts remain upright. The support plates 11 are used to support the bolt heads of the hollow bolts. The bolt rods of the hollow bolts go deep into the groove between the two support plates 11. The conveying rail 3 includes an entrance section 12, a connecting section 14, and a conveying section 21. The entrance section 12 and the conveying section 21 are connected to each other. 21 are all arranged horizontally and connected by an inclined connecting section 14. The height of the inlet section 12 is higher than that of the conveying section 21. The free end of the inlet section 12 is used to connect the discharge port of the vibrator; a sensor bracket is arranged on one side of the conveying rail 3, and a counting sensor 16 for counting the number of hollow bolts conveyed by the conveying rail 3 is arranged on the sensor bracket. The counting sensor 16 is a photoelectric sensor. A protective cover plate 9 is arranged above the conveying section 21. The protective cover plate 9 can prevent foreign matter from entering the conveyor belt and restrain the hollow bolts to prevent the hollow bolts from detaching from the conveyor belt during transportation; A hollow bolt inner hole detection device is arranged on the frame 1 and is located between the conveying rail 3 and the bolt clamping device. The hollow bolt inner hole detection device includes a lifting bracket 6 and a displacement sensor 5. The displacement sensor 5 is installed on the bending arm at the upper end of the lifting bracket 6. The lower end of the lifting bracket 6 is connected and fixed to the piston rod extending upward from the second cylinder 7. The second cylinder 7 is installed on the frame 1 and is used to drive the lifting bracket 6 to move up and down, and drive the measuring shaft 8 of the displacement sensor 5 to move up and down, so as to detect the inner hole diameter of the hollow bolt conveyed on the conveying rail 3; when the measuring shaft 8 of the displacement sensor 5 moves up and down, if the measuring shaft 8 cannot extend into the inner hole of the hollow bolt, the displacement sensor 5 will sense the displacement change, thereby identifying that the inner hole diameter of the hollow bolt is too small and does not meet the design standard; The bolt picking device includes a clamp bracket 10 and a pneumatic clamp 13. The clamp bracket 10 is slidably matched on the frame 1 to move horizontally. The piston rod of the first cylinder 4 is fixedly connected to the clamp bracket 10. The pneumatic clamp 13 is fixed to the clamp bracket 10. A support plate for supporting the bolt head of the hollow bolt is provided on the upper end of the pneumatic clamp 13. The support plate extends toward the conveying rail 3 and has a limit plate. The limit plate is used to abut against the bolt head of the hollow bolt to limit the axial movement of the hollow bolt on the conveying rail 3, and to keep the hollow bolt transported by the bolt picking device in the same posture and angle to be clamped by the pneumatic clamp 13. The bolt picking device is used to send qualified hollow bolts to a predetermined position or remove unqualified hollow bolts into a waste box 17 provided on the frame 1. The waste box 17 is located below the bolt clamping device. A detection device 15 is provided on one side of the bolt picking device, corresponding to the pneumatic clamp 13, and is used to detect whether the pneumatic clamp 13 clamps the hollow bolt. The detection device 15 is a photoelectric sensor. The frame 1 is provided with an air circuit control valve 18, a communication device 19 and a controller 20; the air circuit control valve 18 is air-circuit-connected to the first cylinder 4, the second cylinder 7 and the pneumatic gripper 13, and is electrically connected to the controller 20; the controller 20 is also electrically connected to the counting sensor 16, the detection device 15 and the communication device 19; the communication device 19 is used to communicate with the robot and the production line controller.

[0019] The working process of the present invention is as follows: firstly, the hollow bolts whose inner hole diameter is smaller than the design standard are picked out. For example, a measuring rod can be used in the picking process. The diameter of the measuring rod is larger than the inner hole diameter of the hollow bolt. The bolts whose measuring rod is inserted into the inner hole of the hollow screw are picked out first; then the hollow bolts are vibrated in the vibrator and slide onto the conveying rail 3 of the straight vibrator 2 in a uniform posture. Through the vibration of the straight vibrator 2, the bolts are transferred uniformly and neatly, and the hollow bolts are conveyed to the bolt picking device. A hollow bolt inner hole detection device is arranged between the conveying rail 3 and the bolt clamping device. The hollow bolts The displacement sensor 5 of the inner hole detection device moves up and down. When the measuring shaft 8 of the displacement sensor 5 cannot enter the inner hole of the hollow bolt, the displacement sensor 5 will sense the displacement change, thereby identifying that the inner hole diameter of the hollow bolt is too small and does not meet the design standards. The bolt picking device clamps the hollow bolts from the conveying rail 3, removes the hollow bolts that do not meet the standards to the waste box 17 under the bolt clamping device, and sends the hollow bolts that meet the standards to the predetermined position. The detection device 15 determines that the bolt picking device clamps the hollow bolt at the predetermined position and then notifies the robot to pick up the hollow bolt.

[0020] Of course, we can also first sort out the hollow bolts whose inner hole diameter is larger than the design standard, and then remove the hollow bolts whose measuring shaft 8 of the displacement sensor 5 can enter the inner hole of the hollow bolt.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. An automatic hollow bolt conveying and detection device, comprising a frame (1), a straight vibrator (2) fixed on the frame (1), a conveying rail (3) arranged on the upper end surface of the straight vibrator (2), a bolt picking device, and a first cylinder (4), characterized in that: A hollow bolt inner hole detection device is arranged on a frame (1) and is located between a conveying rail (3) and a bolt clamping device. The hollow bolt inner hole detection device comprises a lifting bracket (6) and a displacement sensor (5). The displacement sensor (5) is mounted on a bending arm at the upper end of the lifting bracket (6). The lower end of the lifting bracket (6) is connected and fixed to a piston rod extending upward from a second cylinder (7). The second cylinder (7) is mounted on the frame (1) and is used to drive the lifting bracket (6) to move up and down, and to drive a measuring shaft (8) of the displacement sensor (5) to move up and down, so as to detect the inner hole diameter of the hollow bolt conveyed on the conveying rail (3). The bolt picking device is driven by a first cylinder (4) to deliver qualified hollow bolts to a predetermined position or to remove unqualified hollow bolts.

2. The automatic conveying and detecting device for hollow bolts according to claim 1, characterized in that: The bolt picking device comprises a clamp bracket (10) and a pneumatic clamp (13); the clamp bracket (10) is slidably fitted on the frame (1) to move horizontally; the piston rod of the first cylinder (4) is fixedly connected to the clamp bracket (10); the pneumatic clamp (13) is fixed on the clamp bracket (10) and is used to deliver qualified hollow bolts to a predetermined position.

3. The automatic conveying and detecting device for hollow bolts according to claim 2, characterized in that: A detection device (15) is provided on the bolt picking device and corresponds to the pneumatic clamp (13), and is used to detect whether the pneumatic clamp (13) clamps a hollow bolt.

4. The automatic conveying and detecting device for hollow bolts according to claim 3, characterized in that: The detection device (15) is a photoelectric sensor.

5. The automatic conveying and detecting device for hollow bolts according to claim 1, characterized in that: A counting sensor (16) for counting the number of hollow bolts transported by the conveyor rail (3) is provided on one side of the conveyor rail (3).

6. The hollow bolt automatic conveying and detection device according to claim 1, characterized in that: A waste box (17) is provided on the frame (1), and the waste box (17) is located below the bolt clamping device.

7. The hollow bolt automatic conveying and detection device according to claim 1, characterized in that: The frame (1) is provided with an air circuit control valve (18), a communication device (19) and a controller (20).

8. The automatic conveying and detecting device for hollow bolts according to claim 1, characterized in that: The conveying rail (3) is two support plates (11) arranged in parallel, a groove is formed between the two support plates (11), and the width of the groove is greater than the diameter of the bolt rod and less than the diameter of the bolt head.

9. The automatic hollow bolt conveying and detection device according to claim 1, characterized in that: The conveying rail (3) comprises an entrance section (12), a connecting section (14), and a conveying section (21); the entrance section (12) and the conveying section (21) are both arranged horizontally and connected via an inclined connecting section (14); the height of the entrance section (12) is higher than the height of the conveying section (21).

10. The automatic conveying and detecting device for hollow bolts according to claim 9, characterized in that: A protective cover plate (9) is provided above the conveying section (21).

Images