Device for transferring circuit board

Abstract

The invention discloses a device for transferring a circuit board, which comprises a conveying device, a driving device, a detection part and a locking part, and is characterized in that the conveying device comprises a roller and a motor, the motor drives the roller to rotate, the driving device drives the conveying device to move up and down, the detection part is arranged below the conveying device, and the locking part is arranged below the conveying device; the locking component comprises a driving component and a lock rod, the driving component drives the lock rod to rotate, and when the detection component is triggered, the driving component drives the lock rod to rotate so as to lock an external cart. According to the device for transferring the circuit board, in the whole process of transferring the circuit board from the external cart to the feeding area of the circuit board testing machine, the circuit board does not need to be carried by an operator, the circuit board can be prevented from being collided and damaged in the manual transferring process, the quality of the circuit board is guaranteed, the labor intensity of the operator can be reduced, and the working efficiency is improved. And the transfer efficiency of the circuit board is also improved, so that the overall test efficiency of the circuit board can be effectively improved.

Description

Technical Field

[0001] The present invention relates to a device for transporting circuit boards. Background Art

[0002] Circuit board functional testing is a detection process for printed circuit boards in the electronics manufacturing industry, aiming to verify whether the entire circuit system on the circuit board works properly according to the design specifications. This kind of testing is crucial for ensuring product quality, reliability, and performance.

[0003] In the existing circuit board testing machines, the loading area is usually a loading conveyor belt. Before testing, the operator uses a trolley to push the cleaned circuit boards to the side of the loading conveyor belt, and then the operator moves stacks of circuit boards to be tested on the trolley onto the loading conveyor belt. This way of transporting circuit boards has a high labor intensity, resulting in a reduction in the overall testing efficiency of the circuit boards. Moreover, the circuit boards are very likely to be bumped and damaged during the handling process, generating defective products and increasing costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for transporting circuit boards to solve at least one of the above technical problems.

[0005] According to one aspect of the present invention, there is provided a device for transporting circuit boards, including:

[0006] A conveying device, which includes a plurality of rotatable rollers arranged in parallel and a motor, and the motor drives the rollers to rotate;

[0007] A driving device, which drives the conveying device to move up and down;

[0008] A detection component, which is arranged below the conveying device. When the carrying rod on the external trolley is pushed above the roller, the front end of the trolley can abut against the detection component and trigger the detection component; and

[0009] A locking component, which is arranged below the conveying device. The locking component includes a driving part and a locking rod, and the driving part drives the locking rod to rotate.

[0010] When the detection component is triggered, the driving part drives the locking rod to rotate to lock the front end of the trolley.

[0011] The device for transporting circuit boards according to the present invention is such that an operator first places multiple stacks of circuit boards to be tested on a trolley. The trolley is provided with multiple parallel arranged bearing rods, and the distance between two adjacent bearing rods is greater than the diameter of the roller. The multiple stacks of circuit boards to be tested are placed on the bearing rods. The operator pushes the trolley towards the conveying device, and the bearing rods on the trolley are located above the rollers of the conveying device. When the front end of the trolley abuts against the detection component, the detection component is triggered. At this time, the bearing rods on the trolley and the rollers are arranged staggeredly in the longitudinal direction. When the detection component is triggered, the driving component drives the locking rod to rotate to lock the front end of the trolley. At this time, the trolley is fixed and cannot move. Then, under the action of the driving device, the rollers on the conveying device move upward. Since the bearing rods and the rollers are arranged staggeredly in the longitudinal direction at this time and the distance between two adjacent bearing rods is greater than the diameter of the roller, the rollers will move upward from the gap between two adjacent bearing rods on the trolley and support the circuit boards on the bearing rods. As the rollers continue to move upward, the circuit boards on the bearing rods are transferred to the rollers. When the bottom of the rollers is higher than the top of the bearing rods, the motor drives the rollers to rotate, and the rotating rollers convey the circuit boards, thereby conveying the circuit boards to be tested to the loading area of the circuit board testing machine. Then, the driving component drives the locking rod to rotate in the reverse direction to unlock the front end of the trolley, and the trolley is pulled out. When all the circuit boards on the rollers are conveyed to the loading area of the circuit board testing machine, the driving device drives the rollers on the conveying device to move downward to prepare for the next transportation of the circuit boards to be tested. During the whole process of transporting the circuit boards from the external trolley to the loading area of the circuit board testing machine, there is no need for the operator to carry them, which can not only avoid bumps and damages to the circuit boards during manual transportation, ensure the quality of the circuit boards, but also reduce the labor intensity of the operator, and the transportation efficiency of the circuit boards is also improved, thereby effectively improving the overall testing efficiency of the circuit boards.

[0012] Furthermore, it further includes a U-shaped bracket with an open side. The conveying device is slidably arranged on the U-shaped bracket. The detection component is a contact switch and the number is two. The detection components are arranged on the U-shaped bracket, and the locking component is arranged on the U-shaped bracket and located between the two detection components.

[0013] When the two detection components are triggered simultaneously, the driving component drives the locking rod to rotate to lock the front end of the external trolley.

[0014] Therefore, the operator pushes the cart from the open side of the U-shaped bracket towards the conveying device. When both ends of the front end of the cart simultaneously abut against two contact switches respectively, the two contact switches are triggered simultaneously. At this time, the driving component drives the locking rod to rotate to lock the front end of the cart, and the cart is fixed and cannot move. Then, under the action of the driving device, the roller on the conveying device moves upward. The roller moves upward from the gap between two adjacent supporting rods and supports the circuit board on the supporting rods. As the roller continues to move upward, the circuit board on the supporting rods is transferred to the roller. When the bottom of the roller is higher than the top of the supporting rods, the motor drives the roller to rotate, and the rotating roller can convey the circuit board. Only when the two detection components are triggered simultaneously will the locking rod lock the front end of the cart. If the two detection components are not triggered simultaneously, it means that the cart is pushed in obliquely. When the cart is pushed in obliquely, the roller cannot move upward from the gap between two adjacent supporting rods on the cart, and interference will occur between the roller and the supporting rods. The setting of the two detection components can ensure that the locking rod locks the front end of the cart only after the cart is correctly pushed in.

[0015] Further, it further includes two mounting plates. The outer ends of the two mounting plates are both arranged on the U-shaped bracket. The two mounting plates are arranged longitudinally. Both detection components are located between the two mounting plates. A guiding plate is provided on the inner end of the mounting plate, and the guiding plate and the mounting plate are arranged at an obtuse angle.

[0016] Therefore, when the external cart is correctly pushed in, the front end of the cart is located between the two mounting plates. During the process of pushing the cart in, as long as it is ensured that the front end of the cart is located between the two guiding plates, the front end of the cart can be accurately pushed between the two mounting plates so that both ends of the front end of the cart simultaneously trigger the two detection components. The guiding plate can guide the front end of the cart to be smoothly pushed between the two mounting plates to simultaneously trigger the two detection components.

[0017] Further, the distance between the two mounting plates is greater than the width of the front end of the external cart.

[0018] Therefore, the distance between the two mounting plates can be slightly greater than the width of the front end of the external cart, ensuring that the front end of the cart can be smoothly pushed between the two mounting plates and also ensuring that the front end of the cart will not be pushed between the two mounting plates obliquely. If the front end of the cart is pushed obliquely between the two mounting plates, the roller cannot move upward from the gap between two adjacent supporting rods on the cart, and interference will occur between the roller and the supporting rods.

[0019] Further, it further includes a bearing plate and guiding columns. The driving device is a motor. The conveying device is arranged on the top of the bearing plate. The guiding columns are arranged on the U-shaped bracket and are arranged longitudinally. The bottom of the bearing plate is slidably arranged on the guiding columns, and the driving device drives the bearing plate to move up and down.

[0020] Therefore, the driving device can drive the conveying device to move up and down through the bearing plate, and the bottom of the bearing plate sliding on the guiding column can ensure that the conveying device can move up and down smoothly.

[0021] Further, the U-shaped bracket includes a connecting frame, a left side frame and a right side frame. The left side frame, the connecting frame and the right side frame are connected in sequence to form a U-shaped bracket with an open side.

[0022] The conveying device, the detection component and the locking component are all arranged on the connecting frame.

[0023] Therefore, the sequentially connected left side frame, connecting frame and right side frame can not only be used to carry the conveying device, but also form a U-shaped bracket with an open side for the cart to be pushed in.

[0024] Further, the driving component is a rotary telescopic cylinder, and the rotary telescopic cylinder drives the locking rod to rotate and move horizontally.

[0025] When the detection component is triggered, the rotary telescopic cylinder drives the locking rod to rotate and move horizontally so that the locking rod is buckled outward on the external cart.

[0026] Therefore, when the two ends of the front end of the cart respectively abut against the two detection components at the same time, it means that the cart is correctly pushed in. At this time, the driving rod of the rotary telescopic cylinder drives the locking rod to rotate a certain angle (such as 90 degrees), and then the driving rod of the rotary telescopic cylinder makes a retracting action, and the locking rod can be buckled outward on the cart to complete the fixation of the cart. When unlocking is required, the driving rod of the rotary telescopic cylinder makes an extending action, and then the driving rod of the rotary telescopic cylinder drives the locking rod to rotate reversely a certain angle (such as 90 degrees), and at this time the cart can be pulled out.

[0027] Further, it further includes a switch, and the switch is electrically connected to the driving component.

[0028] Therefore, when it is necessary to unlock the locking of the cart, the operator can press the switch. After the switch is pressed, the driving rod of the rotary telescopic cylinder makes an extending action, and then the driving rod of the rotary telescopic cylinder drives the locking rod to rotate reversely a certain angle, and the unlocking of the cart is completed.

[0029] Further, the number of the guiding columns is two, the two guiding columns are arranged in parallel, and the bottom of the bearing plate slides on the two guiding columns.

[0030] Therefore, the two guiding columns can ensure that the conveying device moves up and down smoothly.

[0031] Further, the number of the driving devices is two, and the two driving devices drive the bearing plate to move up and down simultaneously.

[0032] Therefore, the two driving devices can drive the carrier plate to move up and down smoothly along the two guiding columns at the same time, so as to ensure the smooth up and down movement of the conveying device. Brief Description of the Drawings

[0033] Figure 1 It is a schematic structural diagram of a device for transporting circuit boards according to the present invention;

[0034] Figure 2 is Figure 1 a schematic structural diagram of the device shown in the A direction;

[0035] Figure 3 is Figure 1 a schematic structural diagram of another perspective of the device shown;

[0036] Figure 4 is Figure 1 a usage state diagram of the device shown. Detailed Embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more; it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can also be an electrical connection, it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication inside two elements.

[0039] Refer to Figures 1 to 3 , a device for transporting circuit boards, including a conveying device 1, a driving device 2, a detection component 3, a locking component 4, a U-shaped bracket 5, a mounting plate 6, a carrier plate 7, a guiding column 8 and a switch 9.

[0040] Refer to Figures 1 to 3, the conveying device 1 includes a plurality of rollers 11 arranged in parallel and a motor 12. The motor 12 is installed on the side of the conveying device 1, and the motor 12 drives the rollers 11 to rotate. The motor 12 can drive all the rollers 11 to rotate synchronously by using an existing transmission mechanism (such as a synchronous pulley + synchronous belt structure).

[0041] See Figures 1 to 3 , the U-shaped bracket 5 includes a connecting frame 501, a left side frame 502, and a right side frame 503. The left side frame 502, the connecting frame 501, and the right side frame 503 are integrally connected in sequence to form a U-shaped bracket 5 with an overall U shape and an open side.

[0042] See Figures 1 to 3 , feet 51 are installed at the bottom of the U-shaped bracket 5. The feet 51 can include a support disk and an adjustment screw. The bottom of the adjustment screw is fixed on the support disk, and the top of the adjustment screw is screwed into the bottom of the U-shaped bracket 5. Among them, one foot 51 is installed at the bottom of the left side frame 502, two feet 51 are installed at the bottom of the connecting frame 501, and one foot 51 is installed at the bottom of the right side frame 503. According to the height of the carrying rod on the external trolley, the height of the roller 11 can be adjusted by the feet 51, so as to ensure that when the external trolley is pushed towards the conveying device 1, the carrying rod on the trolley can be located above the roller 11.

[0043] The conveying device 1 is slidably arranged on the U-shaped bracket 5. Specifically, see Figure 2 and Figure 3 , the conveying device 1 is installed on the top of the bearing plate 7 through a mounting frame 13. Both the roller 11 and the motor 12 are installed on the mounting frame 13. A cross plate 71 is formed at the bottom of the bearing plate 7. The cross plate 71 is sleeved on the guide post 8 through a bushing. The bearing plate 7 can move up and down along the guide post 8. The connecting frame 501 is integrally in a square shape. The top and bottom of the guide post 8 are respectively fixed on the top and bottom of the connecting frame 501 of the U-shaped bracket 5. The guide posts 8 are arranged longitudinally. In this embodiment, the driving device 2 is a motor. In other embodiments, the driving device 2 can also be a cylinder. The cross plate 71 at the bottom of the bearing plate 7 is fixed on the driving shaft of the driving device 2. The driving device 2 can drive the bearing plate 7 to move up and down. The bearing plate 7 can drive the conveying device 1 to move up or down.

[0044] See Figure 2 and Figure 3 , in this embodiment, the number of the driving devices 2 is two, and the number of the guide posts 8 is two. The two guide posts 8 are arranged in parallel. The two driving devices 2 can simultaneously drive the bearing plate 7 to move up and down smoothly along the two guide posts 8, so as to ensure that the conveying device 1 moves up and down smoothly. In other embodiments, the number of the driving devices 2 and the guide posts 8 can be adjusted appropriately according to the size of the conveying device 1.

[0045] The detection component 3 is installed below the conveying device 1. Specifically, referring to Figure 1 and Figure 2 , in this embodiment, the detection component 3 is a contact switch and the number thereof is two, and the number of mounting plates 6 is two. The outer ends of the two mounting plates 6 are both fixed on the connecting frame 501 of the U-shaped bracket 5. The two mounting plates 6 are arranged longitudinally and in parallel. The two detection components 3 are respectively fixed on the connecting frame 501 of the U-shaped bracket 5. The two detection components 3 are located between the two mounting plates 6. The two detection components 3 are respectively close to the two mounting plates 6. A guiding plate 61 is formed on the inner end of the mounting plate 6. The guiding plate 61 and the mounting plate 6 are arranged at an obtuse angle. The two guiding plates 61 are arranged in a V-shaped pattern. An operator pushes an external trolley into the space between the left frame 502 and the right frame 503 of the U-shaped bracket 5. When the front end of the trolley is pushed between the two mounting plates 6, the two ends of the front end of the trolley can respectively abut against the two detection components 3 at the same time, and the two detection components 3 are triggered simultaneously. When the two detection components 3 are triggered simultaneously, the locking component 4 locks the front end of the trolley 5, and the trolley is fixed and cannot move. Only when the two detection components 3 are triggered simultaneously will the locking component 4 lock the front end of the trolley. If the two detection components 3 are not triggered simultaneously, it means that the trolley is pushed in obliquely. During the process of pushing the trolley, as long as it is ensured that the two ends of the front end of the trolley are located between the two guiding plates 61, the front end of the trolley can be accurately pushed between the two mounting plates 6 so that the two ends of the front end of the trolley trigger the two detection components 3 at the same time. The guiding plate 61 can guide the front end of the trolley to be smoothly pushed between the two mounting plates 6 to trigger the two detection components 3 at the same time.

[0046] The distance between the two mounting plates 6 is greater than the width of the front end of the external trolley. The distance between the two mounting plates 6 only needs to be slightly greater than the width of the front end of the external trolley, so as to ensure that the front end of the trolley can be smoothly pushed between the two mounting plates 6 and also ensure that the front end of the trolley will not be pushed between the two mounting plates 6 obliquely. If the front end of the trolley is pushed obliquely between the two mounting plates 6, the roller 11 of the conveying device 1 cannot move upward from the gap between two adjacent bearing rods on the trolley for placing the circuit board, and interference will occur between the roller 11 and the bearing rods on the trolley.

[0047] The locking component 4 is installed below the conveying device 1. Specifically, referring to Figure 1 and Figure 2 , the locking component 4 includes a driving component 41 and a locking rod 42. In this embodiment, the driving component 41 is a rotary telescopic cylinder. The driving component 41 is fixed on the connecting frame 501 of the U-shaped bracket 5. One end of the locking rod 42 is fixed on the driving rod of the rotary telescopic cylinder. The rotary telescopic cylinder and the locking rod 42 are located between the two detection components 3. The rotary telescopic cylinder can drive the locking rod 42 to rotate and move horizontally ( Figure 2In the front-rear direction), when the two ends of the front end of the external trolley simultaneously abut against the two detection components 3 respectively, the two detection components 3 are triggered simultaneously, indicating that the trolley is correctly pushed in. At this time, the driving rod of the rotary telescopic cylinder drives the locking rod 42 to rotate by a certain angle (such as 90 degrees), and then the driving rod of the rotary telescopic cylinder performs a retraction action, and the locking rod 42 can move outward ( Figure 1 in the A direction in) to be buckled on the trolley to complete the fixation of the trolley. When unlocking is required, the driving rod of the rotary telescopic cylinder performs an extension action, and then the driving rod of the rotary telescopic cylinder drives the locking rod 42 to rotate reversely by a certain angle (such as 90 degrees), and at this time the trolley can be pulled out from between the left frame 502 and the right frame 503 of the U-shaped bracket 5.

[0048] Refer to Figure 1 and Figure 2 , the switch 9 is fixed on the right frame 503 of the U-shaped bracket 5, and the switch 9 is connected to the driving component 41 through a wire harness. When unlocking the locking of the trolley is required, the operator can press the switch 9. After the switch 9 is pressed, the driving rod of the rotary telescopic cylinder performs an extension action, and then the driving rod of the rotary telescopic cylinder drives the locking rod 42 to rotate reversely by a certain angle (such as 90 degrees), and the unlocking of the trolley is completed.

[0049] In other embodiments, the driving component 41 and the locking rod 42 can also be replaced with a motor and a locking hook. The motor can drive the locking hook to rotate. When the two ends of the front end of the external trolley can respectively abut against the two detection components 3, the motor drives the locking hook to rotate so that the locking hook hooks the trolley. When unlocking is required, the motor drives the locking hook to rotate so that the locking hook disengages from the trolley.

[0050] A controller (microcontroller or CPU) can be installed on the U-shaped bracket 5. The motor 12, the driving device 2, the detection component 3, and the driving component 41 are connected to the controller through a wire harness. The switch signal generated when the detection component 3 is triggered can be sent to the controller. The working modes of the motor 12, the driving device 2, and the driving component 41 can be set in advance by the controller, and the controller can control the coordinated work of the driving motor 12, the driving device 2, and the driving component 41.

[0051] Figure 4 Schematically shows Figure 1 the usage state of the device for transporting circuit boards shown.

[0052] Refer to Figure 4 , on the trolley 100 adapted to the device for transporting circuit boards of the present invention, a plurality of parallel arranged carrying rods 101 are installed. The distance between two adjacent carrying rods 101 is greater than the diameter of the roller 11, and there is a cross beam 102 at the front end of the trolley 100.

[0053] Refer to Figures 1 to 4, for the device for transporting circuit boards of the present invention, before the cart 100 transports the circuit boards, the operator places multiple stacks of circuit boards to be tested on the bearing rods 101 of the cart 100, and the operator pushes the cart 100 along Figure 4 in the F direction in Figure 2 towards the space between the left frame 502 and the right frame 503 of the U-shaped bracket 5. The bearing rods 101 on the cart 100 are located above the rollers 11 of the conveying device 1. As the cart 100 is further pushed in, under the guiding action of the two guiding plates 61, the cross beam 102 at the front end of the cart 100 is pushed between the two mounting plates 6. Both ends of the cross beam 102 at the front end of the cart 100 simultaneously abut against the two detection components 3, and the two detection components 3 are triggered simultaneously. At this time, the bearing rods 101 on the cart 100 and the rollers 11 are staggeredly arranged in the longitudinal direction ( Figure 4The F direction in it is snap-connected to the cross beam 102 at the front end of the trolley 100 to complete the fixation of the trolley 100. Then, under the action of the driving device 2, the roller 11 moves upward. At this time, since the bearing rods 101 on the trolley 100 are longitudinally staggered with the roller 11 and the distance between two adjacent bearing rods 101 on the trolley 100 is greater than the diameter of the roller 11, the roller 11 will move upward from the gap between two adjacent bearing rods 101 on the trolley 100 and support the circuit board on the bearing rod 101 of the trolley 100. As the roller 11 continues to move upward, multiple stacks of circuit boards on the bearing rod 101 of the trolley 100 are transferred to the roller 11. When the bottom of the roller 11 is higher than the top of the bearing rod 101 on the trolley 100, under the driving action of the motor 12, the rotating roller 11 can convey the circuit board, so as to convey the circuit board to be tested to the loading area of the circuit board testing machine. Then, the driving rod of the driving component 41 makes an extending action and drives the locking rod 42 to rotate reversely by a certain angle. At this time, the trolley 100 can be pulled out from between the left side frame 502 and the right side frame 503 of the U-shaped bracket 5. When all the circuit boards on the roller 11 are conveyed to the loading area of the circuit board testing machine (the working time of the motor 12 can be set to T, and after the motor 12 works for the time T, all the circuit boards on the roller 11 can be conveyed to the loading area of the circuit board testing machine), the driving device 2 drives the roller 11 to move downward to prepare for the next transfer of the circuit board to be tested. During the process of pushing the trolley 100 in, if the two detection components 3 are not triggered simultaneously, it means that the trolley 100 is pushed in obliquely. When the trolley 100 is pushed in obliquely, the roller 11 of the conveying device 1 cannot move upward from the gap between two adjacent bearing rods 101 on the trolley 100, and interference will occur between the roller 11 and the bearing rod 101 on the trolley 100. The setting of the two detection components 3 can ensure that the locking component 4 will lock the cross beam 102 at the front end of the trolley 100 only after the trolley 100 is correctly pushed in; for the device for transferring circuit boards of the present invention, during the whole process of transferring the circuit board from the external trolley 100 to the loading area of the circuit board testing machine, there is no need for operators to carry it, which can not only avoid bumps and damages to the circuit board during manual transfer, ensure the quality of the circuit board, but also reduce the labor intensity of the operators, and the transfer efficiency of the circuit board is also improved, so as to effectively improve the overall testing efficiency of the circuit board.

[0054] The above are only some embodiments of the present invention, aiming to illustrate the technical means of the present invention, not to limit the technical scope of the present invention. Obvious improvements made by those skilled in the art in combination with the existing common general knowledge fall within the protection scope of the present invention.

Claims

1. A device for transporting circuit boards, characterized in that: include: A conveying device, the conveying device comprising a plurality of rollers arranged in parallel and a motor, the motor driving the rollers to rotate; A driving device, wherein the driving device drives the conveying device to move up and down; A detection component is arranged below the conveying device, When the carrying rod on the external trolley is pushed above the roller, the front end of the trolley can abut against the detection component and trigger the detection component; and The locking component is arranged below the conveying device, and the locking component includes a driving component and a locking rod. The driving component drives the locking rod to rotate. When the detection component is triggered, the driving component drives the locking rod to rotate to lock the front end of the external cart.

2. The device according to claim 1, characterized in that It also includes a U-shaped bracket with an open side, the conveying device is slidably mounted on the U-shaped bracket, the detection components are contact switches and there are two of them, the detection components are mounted on the U-shaped bracket, and the locking component is mounted on the U-shaped bracket and located between the two detection components. When the two detection components are triggered at the same time, the driving component drives the locking rod to rotate to lock the front end of the external cart.

3. The device according to claim 2, characterized in that It also includes two mounting plates, the outer ends of the two mounting plates are both arranged on the U-shaped bracket, the two mounting plates are arranged longitudinally, the two detection components are both located between the two mounting plates, and a guide plate is provided on the inner end of the mounting plate, and the guide plate and the mounting plate are arranged at an obtuse angle.

4. The device according to claim 3, characterized in that The distance between the two mounting plates is greater than the width of the outer front end of the cart.

5. The device according to claim 2, characterized in that It also includes a supporting plate and a guide column, the driving device is a motor, the conveying device is arranged on the top of the supporting plate, the guide column is arranged on a U-shaped bracket and arranged longitudinally, the bottom of the supporting plate is slid on the guide column, and the driving device drives the supporting plate to move up and down.

6. The device according to any one of claims 2 to 5, characterized in that The U-shaped bracket includes a connecting bracket, a left side bracket and a right side bracket, and the left side bracket, the connecting bracket and the right side bracket are sequentially connected to form a U-shaped bracket with an open side. The conveying device, the detection component and the locking component are all arranged on the connecting frame.

7. The device according to any one of claims 1 to 5, characterized in that The driving component is a rotating telescopic cylinder, which drives the locking rod to rotate and move horizontally. When the detection component is triggered, the rotating telescopic cylinder drives the locking rod to rotate and move horizontally so that the locking rod is buckled outwardly onto the external trolley.

8. The device according to claim 7, characterized in that A switch is also included, and the switch is electrically connected to the driving component.

9. The device according to claim 5, characterized in that The number of the guide posts is two, the two guide posts are arranged in parallel, and the bottom of the bearing plate is slidably disposed on the two guide posts.

10. The device according to claim 9, characterized in that There are two driving devices, and the two driving devices drive the carrying plate to move up and down simultaneously.

Images