Stacked material detection mechanism of UV spraying machine before spraying of semi-finished product number plates

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By designing a material stacking detection mechanism on a UV spraying machine, and using a pressure sensor and a cylinder-driven rotating mechanism to detect and separate stacked materials, the problem of unpainted license plates caused by material stacking by robotic arms is solved, achieving rapid detection and efficient spraying.

CN224190001UActive Publication Date: 2026-05-01SICHUAN TONGAN IND

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: SICHUAN TONGAN IND
Filing Date: 2026-03-26
Publication Date: 2026-05-01

AI Technical Summary

Technical Problem

In existing technologies, robotic arms are prone to stacking materials when grasping semi-finished license plates, resulting in some license plates not being painted with numbers, which increases the amount of rework.

Method used

A material stacking detection mechanism for a UV spraying machine was designed. It uses a pressure sensor and a cylinder-driven rotating mechanism to detect whether the semi-finished license plates are stacked. The pressure sensor determines whether multiple license plates are stacked, and the controller controls the robotic arm to separate the stacked materials.

Benefits of technology

Rapid detection and avoidance of overlapping materials ensure that each license plate number is painted, reducing rework and improving production efficiency.

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Abstract

The utility model discloses a material stacking detection mechanism of a UV spraying machine before spraying semi-finished product number plates, and relates to the technical field of detecting whether two semi-finished product number plates are stacked together, a piston rod of a jacking air cylinder upwards penetrates through the top wall of a frame, and a connecting rod is hinged to the extending end of the piston rod. The other end of the connecting rod is hinged to the bottom surface of the flat plate through a second pin shaft; a longitudinal strip-shaped plate is fixedly arranged on the top surface of the right end part of the flat plate, an L-shaped plate is arranged on the top surface of the strip-shaped plate, and a horizontal part of the L-shaped plate is fixedly arranged on the top surface of the strip-shaped plate through a locking screw; a dowel bar is arranged in the strip-shaped plate in a penetrating mode, a ball head located over the flat plate is fixedly arranged at the left end of the dowel bar, an L-shaped dowel block is fixedly arranged at the right end of the dowel bar, and the right end of the L-shaped dowel block makes contact with the left end face of the pressure sensor. The semi-finished product number plate stacking detection device has the advantage of being capable of rapidly detecting whether semi-finished product number plates are stacked or not.

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Description

A UV spraying machine's material stacking detection mechanism before spraying semi-finished license plates. Technical Field

[0001] This utility model relates to the technical field of detecting whether two semi-finished license plates are stacked together, and in particular to a stacking detection mechanism for a UV spraying machine before spraying semi-finished license plates. Background Technology

[0002] The UV spraying machine is used to spray a string of letters and numbers on the top surface of the semi-finished license plate to obtain the finished license plate. The finished license plate is used to install on the license plate mounting frame at the rear of motorcycles or cars. The structure of the semi-finished license plate 1 is shown in Figures 1 and 2. The spraying head 2 of the UV spraying machine is located directly above the flat belt 4 of the flat belt conveyor 3, as shown in Figure 3.

[0003] To improve the efficiency of spraying numbers onto semi-finished license plate 1, workers in the workshop use robotic arms to grab the semi-finished license plate 1 one by one from the material basket and place them onto the flat belt 4 of the flat belt conveyor 3. The specific operation method is as follows:

[0004] S1. Workers pre-stack multiple semi-finished product number plates 1 from bottom to top in a material basket;

[0005] S2. Start the robotic arm. The gripping mechanism on the robotic arm extends into the material basket and grabs the topmost semi-finished product number 1.

[0006] S3. The robotic arm transfers both the gripping mechanism and the gripped semi-finished number plate 1 to directly above the flat belt 4 of the flat belt conveyor 3. Then, the gripping mechanism is opened, and the gripped semi-finished number plate 1 falls onto the flat belt 4, as shown in Figure 4. The flat belt 4 transports the semi-finished number plate 1 toward the spray head 2 of the UV spraying machine. After the semi-finished number plate 1 passes through the spray head 2, a string of numbers can be sprayed on the top surface of the semi-finished number plate 1.

[0007] S4. After the robotic arm repeats the operation of step S3, it can spray a string of numbers onto the top surface of the semi-finished license plate 1 one after another.

[0008] However, although the workers in the workshop used robotic arms to spray a series of numbers onto the top surface of multiple semi-finished license plates, the following technical defects still exist:

[0009] I. In steps S2 to S3, after the robotic arm's gripping mechanism picks up the semi-finished product number plate 1 from the material basket, sometimes another semi-finished product number plate 1 is still attached to the bottom surface of the first semi-finished product number plate 1. In other words, a stacking phenomenon occurs, causing the two stacked semi-finished product number plates 1 to fall onto the flat belt 4, as shown in Figure 5. Consequently, the top surface of the lower layer of semi-finished product number plate 1 is not painted with a number, resulting in defective products flowing into the subsequent workshop. When the subsequent workers discover this, they can only rework the product, which undoubtedly increases the workload of the workers.

[0010] Therefore, there is an urgent need for a material stacking detection agency that can quickly detect whether semi-finished license plates are stacked. Summary of the Invention

[0011] The purpose of this invention is to overcome the shortcomings of the prior art and provide a material stacking detection mechanism for a UV spraying machine before spraying semi-finished license plates.

[0012] The purpose of this utility model is achieved through the following technical solution: a material stacking detection mechanism for a UV spraying machine before spraying semi-finished license plates, which includes a frame fixed on the top surface of a pad, a vertical plate fixed on the top surface of the frame, a first pin fixed on the front end face of the vertical plate, a horizontally arranged flat plate rotatably mounted on the first pin, a lifting cylinder fixed inside the frame and on its bottom edge, located on the left side of the vertical plate, the piston rod of the lifting cylinder extending upward through the top wall of the frame, and a connecting rod hinged to the extension end, the other end of the connecting rod being hinged to the bottom surface of the flat plate via a second pin.

[0013] A longitudinally arranged strip plate is fixed on the top surface of the right end of the plate. An L-plate is provided on the top surface of the strip plate. The horizontal part of the L-plate is fixed on the top surface of the strip plate by locking screws. The vertical part of the L-plate is located on the right side of the strip plate, and a pressure sensor is fixed on the left end face of the vertical part of the L-plate.

[0014] A force transmission rod is inserted inside the strip plate. A ball head is fixed at the left end of the force transmission rod and located directly above the plate. An L-shaped force transmission block is fixed at the right end of the force transmission rod. The right end of the L-shaped force transmission block is in contact with the left end face of the pressure sensor. A spring is sleeved on the force transmission rod, and the left and right ends of the spring are fixed on the strip plate and the L-shaped force transmission block, respectively.

[0015] A foot pad is fixed on the bottom surface of the pad and at each of its four corners.

[0016] A support plate is fixed on the bottom surface of the plate, and the second pin is hinged between the support plate and the connecting rod.

[0017] The flat plate and the strip plate are integrally formed.

[0018] The strip plate has a light hole that penetrates its left and right end faces. The diameter of the light hole is equal to the diameter of the force transmission rod, and the force transmission rod passes horizontally through the light hole.

[0019] The stacking detection mechanism also includes a controller, which is electrically connected to the lifting cylinder and pressure sensor via signal lines.

[0020] This utility model has the following advantages: it can quickly detect whether semi-finished license plates are stacked. Attached Figure Description

[0021] Figure 1 is a structural diagram of a semi-finished license plate;

[0022] Figure 2 is a schematic cross-section of Figure 1;

[0023] Figure 3 is a schematic diagram showing that the spray head of the UV spraying machine is located directly above the flat belt of the flat belt conveyor;

[0024] Figure 4 is a schematic diagram of a semi-finished license plate falling on the flat strip;

[0025] Figure 5 is a schematic diagram of two stacked semi-finished license plates falling onto a flat strip;

[0026] Figure 6 is a structural schematic diagram of this utility model;

[0027] Figure 7 is a schematic diagram of the M direction in Figure 6;

[0028] Figure 8 is a partial cross-sectional view of Figure 6;

[0029] Figure 9 is a schematic diagram of the connection between the force transmission rod and the L-shaped force transmission block of this utility model;

[0030] Figure 10 is a schematic diagram of the main section of Figure 9;

[0031] Figure 11 is a schematic diagram of the connection between the L-plate and the pressure sensor of this utility model;

[0032] Figure 12 is a partial cross-sectional view of Figure 11;

[0033] Figure 13 is a schematic diagram showing a single semi-finished license plate on a flat plate;

[0034] Figure 14 is a schematic diagram of two semi-finished license plates stacked together on a flat plate;

[0035] In the picture:

[0036] 1-Semi-finished product number plate, 2-Spray head, 3-Flat belt conveyor, 4-Flat belt;

[0037] 5-Plate, 6-Frame, 7-Upright plate, 8-First pin, 9-Flat plate, 10-Lifting cylinder, 11-Connecting rod, 12-Second pin, 13-Strip plate, 14-L-plate, 15-Pressure sensor, 16-Force transmission rod, 17-Ball head, 18-L-shaped force transmission block, 19-Spring, 20-Support plate. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings. The scope of protection of the present invention is not limited to the following description:

[0039] As shown in Figures 6 to 12, a material stacking detection mechanism for a UV spraying machine before spraying semi-finished license plates includes a frame 6 fixed to the top surface of a pad 5. A vertical plate 7 is fixed to the top surface of the frame 6, and a first pin 8 is fixed to the front end of the vertical plate 7. A horizontally arranged flat plate 9 is rotatably mounted on the first pin 8. A lifting cylinder 10 located on the left side of the vertical plate 7 is fixed inside the frame 6 and on its bottom edge. The piston rod of the lifting cylinder 10 extends upward through the top wall of the frame 6, and a connecting rod 11 is hinged to its extension end. The other end of the connecting rod 11 is hinged to the bottom surface of the flat plate 9 via a second pin 12. A foot pad is fixed to the bottom surface of the pad 5 at each of its four corners.

[0040] A longitudinally arranged strip plate 13 is fixedly mounted on the top surface of the right end of the plate 9. The plate 9 and the strip plate 13 are integrally formed. An L-plate 14 is provided on the top surface of the strip plate 13. The horizontal part of the L-plate 14 is fixed to the top surface of the strip plate 13 by locking screws. The vertical part of the L-plate 14 is located on the right side of the strip plate 13, and a pressure sensor 15 is fixedly mounted on the left end face of the vertical part of the L-plate 14. A force transmission rod 16 passes through the strip plate 13. A ball head 17 located directly above the plate 9 is fixedly mounted on the left end of the force transmission rod 16. An L-shaped force transmission block 18 is fixedly mounted on the right end of the force transmission rod 16. The right end of the L-shaped force transmission block 18 is in contact with the left end face of the pressure sensor 15. A spring 19 is sleeved on the force transmission rod 16. The left and right ends of the spring 19 are fixed to the strip plate 13 and the L-shaped force transmission block 18, respectively.

[0041] A support plate 20 is fixedly mounted on the bottom surface of the plate 9, and the second pin 12 is hinged between the support plate 20 and the connecting rod 11. A light hole is opened in the strip plate 13, penetrating its left and right end faces. The diameter of the light hole is equal to the diameter of the force transmission rod 16, and the force transmission rod 16 horizontally passes through the light hole.

[0042] The stacking detection mechanism also includes a controller, which is electrically connected to the lifting cylinder 10 and the pressure sensor 15 via a signal line. When the left end face of the pressure sensor 15 is pressed, the pressure sensor 15 sends a pressure signal to the controller. In addition, the worker can also control the piston rod of the lifting cylinder 10 to extend upward through the controller so that the plate 9 rotates clockwise.

[0043] S1. Workers pre-stack multiple semi-finished product number plates 1, as shown in Figures 1-2, from bottom to top in a material basket;

[0044] S2. Start the robotic arm. The robotic arm grabs the top layer of the semi-finished product number plate 1 in the material basket. Then the robotic arm rotates the grabbing mechanism and the grabbed semi-finished product number plate 1 around to the top surface of the plate 9 of the stacking detection mechanism.

[0045] S3. The piston rod of the lifting cylinder 10 extends upward, and the piston rod drives the connecting rod 11 to move upward. The connecting rod 11 drives the plate 9 to rotate clockwise around the axis of the first pin 8. At the same time, the plate 9 drives the strip plate 13, L plate 14, force transmission rod 16 and L-shaped force transmission block 18 to rotate synchronously. At the same time, the plate 9 also drives the semi-finished license plate 1 that is transferred on it to rotate synchronously. When the plate 9 rotates to a certain angle, the semi-finished license plate 1 on the plate 9 tilts and slides downward under its own weight.

[0046] If the pressure sensor 15 does not receive pressure, it will not send a pressure signal to the controller, indicating that there is only one semi-finished number plate 1 on the plate 9, as shown in Figure 13. Then the robotic arm grabs the semi-finished number plate 1 onto the flat belt 4 of the flat belt conveyor 3. The flat belt 4 transports the semi-finished number plate 1 toward the spray head 2 of the UV spraying machine. After the semi-finished number plate 1 passes through the spray head 2, a string of numbers can be sprayed on the top surface of the semi-finished number plate 1.

[0047] If the pressure sensor 15 receives pressure, it sends a pressure signal to the controller. [The reason for sending the pressure signal is that the semi-finished product number plate 1 located on the upper layer applies pressure to the force transmission rod 16, and the force transmission rod 16 transmits the pressure to the pressure sensor 15 through the L-shaped force transmission block 18. After being pressed, the pressure sensor 15 sends a pressure signal to the controller.] This indicates that there are two semi-finished product number plates 1 stacked together on the plate 9, as shown in Figure 14, which means that the stacking phenomenon has occurred. At this time, the robotic arm grabs the two stacked semi-finished product number plates 1 on the plate 9 and puts them into the waste bin.

[0048] S4. Repeat steps S2 to S3 multiple times to spray a series of numbers onto the top surface of the semi-finished license plate 1 one after another.

[0049] In step S3, after the robotic arm grabs the semi-finished license plate 1 onto the flat plate 9, it is only necessary to first control the piston rod of the lifting cylinder 10 to extend upward so that the semi-finished license plate 1 tilts and slides downward under its own weight, and then determine whether the pressure sensor 15 sends a pressure signal to the controller. This will quickly detect whether there is another semi-finished license plate 1 attached to the bottom surface of the semi-finished license plate 1 that has been grabbed onto the flat plate 9.

[0050] Therefore, this stacking detection mechanism can quickly detect whether the semi-finished license plate 1 is stacked, thus effectively preventing the robotic arm from directly grabbing the two stacked semi-finished license plates 1 onto the flat belt 4, thereby preventing the lower layer of semi-finished license plates from not being sprayed with numbers, thus ensuring that each semi-finished license plate 1 can be sprayed with a string of numbers.

Claims

1. A material stacking detection mechanism for a UV spraying machine before spraying semi-finished license plates, characterized in that: It includes a frame (6) fixed to the top surface of a pad (5), a vertical plate (7) fixed to the top surface of the frame (6), a first pin (8) fixed to the front end face of the vertical plate (7), a horizontally arranged plate (9) rotatably mounted on the first pin (8), a lifting cylinder (10) fixed inside the frame (6) and on its bottom edge, located on the left side of the vertical plate (7), the piston rod of the lifting cylinder (10) passes upward through the top wall of the frame (6), and a connecting rod (11) is hinged to the extended end, the other end of the connecting rod (11) is hinged to the bottom surface of the plate (9) via a second pin (12); a longitudinally arranged strip plate (13) is fixed to the top surface of the right end of the plate (9), and an L-plate (14) is provided on the top surface of the strip plate (13). The horizontal part of the L plate (14) is fixed to the top surface of the strip plate (13) by locking screws. The vertical part of the L plate (14) is located on the right side of the strip plate (13), and a pressure sensor (15) is fixed on the left end face of the vertical part of the L plate (14). A force transmission rod (16) is inserted inside the strip plate (13). A ball head (17) located directly above the plate (9) is fixed on the left end of the force transmission rod (16). An L-shaped force transmission block (18) is fixed on the right end of the force transmission rod (16). The right end of the L-shaped force transmission block (18) is in contact with the left end face of the pressure sensor (15). A spring (19) is sleeved on the force transmission rod (16). The left and right ends of the spring (19) are fixed on the strip plate (13) and the L-shaped force transmission block (18) respectively.

2. The material stacking detection mechanism of a UV spraying machine before spraying semi-finished license plates according to claim 1, characterized in that: A foot pad is fixed on the bottom surface of the pad (5) and at each of its four corners.

3. The material stacking detection mechanism of a UV spraying machine before spraying semi-finished license plates according to claim 1, characterized in that: A support plate (20) is fixed on the bottom surface of the plate (9), and the second pin (12) is hinged between the support plate (20) and the connecting rod (11).

4. The material stacking detection mechanism of a UV spraying machine before spraying semi-finished license plates according to claim 1, characterized in that: The flat plate (9) and the strip plate (13) are integrally formed.

5. The material stacking detection mechanism of a UV spraying machine before spraying semi-finished license plates according to claim 1, characterized in that: The strip plate (13) has a light hole that passes through its left and right ends. The diameter of the light hole is equal to the diameter of the force transmission rod (16). The force transmission rod (16) passes horizontally through the light hole.

6. The material stacking detection mechanism of a UV spraying machine before spraying semi-finished license plates according to claim 1, characterized in that: The stacking detection mechanism also includes a controller, which is electrically connected to the lifting cylinder (10) and pressure sensor (15) via signal lines.