Automatic installation detection equipment for breather valve

Abstract

The present application relates to a kind of automatic installation detection equipment of air vent, for filling workpiece in product, and the appearance of the product is checked;The automatic installation detection equipment of air vent includes conveying device for carrying and conveying the product, assembly detection device, feeding device;The assembly detection device includes fixed base, folding mechanical arm and assembly detection component;The fixed base is fixedly installed on the side of the feeding device, and the folding mechanical arm is horizontally rotatably connected with the fixed base;The free end of the folding mechanical arm is rotatably connected with the assembly detection component;The equipment does not need manual auxiliary filling and checking, and the appearance of product can be effectively detected and filled by assembly detection device, effectively improve product processing quality and filling efficiency.

Description

Technical Field

[0001] This invention relates to the field of equipment processing, and in particular to an automatic installation and testing device for a vent valve. Background Technology

[0002] In the modular product manufacturing and processing process, the products need to be further processed and assembled. However, the assembly and processing of such products is mostly still done manually. Manual assembly and processing of products requires a lot of human resources and is limited by the speed and precision of human operation, resulting in low overall production efficiency. Compared with automated assembly equipment, manual assembly often cannot respond quickly to changes in production needs and has a high error rate.

[0003] In addition, some equipment manufacturers assemble products using semi-automatic filling machines, but these machines still require manual inspection and control. The semi-automatic filling machines still require manual inspection and control during the assembly process, which means that the degree of automation is still insufficient and cannot completely eliminate the dependence on human labor. Furthermore, different workers may have different judgment standards and operating methods when operating this type of machine, which may also lead to inconsistencies in product quality. Summary of the Invention

[0004] Therefore, it is necessary to provide an automatic installation and testing device for breathable valves that offers high efficiency and good product processing quality, addressing the problems of existing technologies.

[0005] The technical solution of this invention is an automatic installation and testing device for a vent valve, used to load workpieces into a product and inspect the appearance of the product. The automatic installation and testing device for a vent valve includes a conveying device for carrying and conveying the product, an assembly and testing device, and a feeding device. The assembly and testing device includes a fixed base, a folding robotic arm, and an assembly and testing assembly. The fixed base is fixedly installed on one side of the feeding device, and the folding robotic arm is horizontally rotatably connected to the fixed base. The free end of the folding robotic arm is rotatably connected to the assembly and testing assembly. In use, the folding robotic arm, through horizontal rotation and its own bending, drives the assembly and testing assembly to grab the workpiece from the feeding device and load it into the product on the conveying device. After loading is complete, the assembly and testing device then inspects the appearance of the product containing the workpiece.

[0006] Furthermore, the assembly and testing component includes a robotic arm, a camera device, and a mechanical mounting base, with the robotic arm and the camera device mounted side by side on the mechanical mounting base.

[0007] Furthermore, the assembly and testing component also includes a push cylinder, one end of which is mounted on the mechanical mounting base, and the other end is connected to the robotic arm via a spring.

[0008] Furthermore, a first guide rail is provided on the mechanical mounting base, and the camera device is slidably mounted on the first guide rail; an aperture for supplementary lighting is provided on the first guide rail opposite to the camera device.

[0009] Furthermore, the folding robotic arm includes a first folding arm rotatably connected to the fixed base, a fourth folding arm rotatably connected to the assembly detection component, a second folding arm hinged to the first folding arm, and a third folding arm hinged to the fourth folding arm; the second folding arm is hinged to the third folding arm.

[0010] Furthermore, the conveying device includes a conveyor belt and a tray for carrying products, the conveyor belt is provided with a second guide rail, and the tray slides on the second guide rail of the conveyor belt.

[0011] Furthermore, the automatic vent valve also includes a lifting mechanism, which includes a lifting seat and a cylinder; the lifting seat is installed on the conveying device at the bottom of the support tray, the piston rod of the cylinder passes through the lifting seat and abuts against the support tray, and the cylinder barrel is fixed to the bottom of the lifting seat.

[0012] Furthermore, the lifting mechanism also includes multiple guide columns, which pass through the lifting seat and connect to the support tray respectively; the guide columns on both sides of the lifting seat are connected to the lifting seat as a whole by fasteners.

[0013] Furthermore, the automatic installation and testing equipment for the vent valve also includes a rotating mechanism disposed between the lifting mechanism and the support tray; the rotating mechanism includes an intermediate seat, the bottom of which is connected to the piston rod of the cylinder; a bearing and a mounting seat are disposed on the intermediate seat, the outer ring of the bearing is fixed on the intermediate seat, the inner ring extends upward and is connected to the support tray; a toothed ring is sleeved on the extended inner ring, and a rack and a drive module for driving the rack to move are disposed on the mounting seat, the rack meshing with the toothed ring.

[0014] Furthermore, the feeding device also includes a material distribution and positioning mechanism, which includes a material distribution and positioning seat for accommodating the workpiece and a drive cylinder for driving the material distribution and positioning seat to push outward; the input end of the material distribution and positioning seat is connected to the output of the conveyor belt.

[0015] The beneficial effects of this invention are as follows:

[0016] This application provides an automatic installation and testing device for vent valves. Through the cooperation of a folding robotic arm and assembly and testing components, it effectively reduces the time spent adjusting the position and angle of the equipment, thereby improving the efficiency of assembly and testing. For products that have been initially filled, the assembly and testing device can also inspect their appearance to promptly identify any abnormalities in the filling and refill them, preventing defective products from entering the next process. This effectively reduces the defect rate in the production process, thereby improving production quality and reducing the waste of raw materials and rework costs. Attached Figure Description

[0017] Figure 1 A 3D schematic diagram of an automatic installation and testing device for a vent valve;

[0018] Figure 2 for Figure 1 A three-dimensional schematic diagram of the automatic installation and testing equipment for the vent valve with the housing removed;

[0019] Figure 3 for Figure 2 A three-dimensional schematic diagram of the automatic installation and testing equipment for the vent valve from another angle;

[0020] Figure 4 for Figure 3 A three-dimensional schematic diagram of the automatic installation and testing equipment for the vent valve, excluding the assembly and testing device and the feeding device;

[0021] Figure 5 A three-dimensional schematic diagram of the conveying device and lifting mechanism for the automatic installation and testing equipment of the vent valve;

[0022] Figure 6 A three-dimensional schematic diagram of the lifting mechanism for the automatic installation and testing equipment of the vent valve;

[0023] Figure 7 A three-dimensional schematic diagram showing the coordination between the lifting mechanism and the rotating mechanism of the automatic installation and testing equipment for the vent valve;

[0024] Figure 8 for Figure 6 A three-dimensional diagram showing the product after the lifting mechanism has been placed on the product;

[0025] Figure 9 for Figure 8 A three-dimensional diagram of the lifting mechanism after the product has been placed, taken from another angle.

[0026] Figure 10 A three-dimensional schematic diagram of the assembly and testing mechanism for the automatic installation and testing equipment of the vent valve;

[0027] Figure 11 for Figure 10 A three-dimensional schematic diagram of the assembly and testing facility from another angle;

[0028] Figure 12A three-dimensional schematic diagram of the assembly and testing components for an automatic installation and testing equipment for vent valves;

[0029] Figure 13 A three-dimensional schematic diagram of the feeding device for the automatic installation and detection equipment of the vent valve;

[0030] Figure 14 A three-dimensional schematic diagram of the material positioning mechanism for the automatic installation and testing equipment of the vent valve;

[0031] Figure 15 A three-dimensional schematic diagram of the vibratory feeder for the automatic installation and testing equipment of the vent valve;

[0032] Figure 16 for Figure 12 An exploded view of the assembly and testing components. Detailed Implementation

[0033] To facilitate understanding of the present invention, a more comprehensive description will be given below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0035] Please refer to Figures 1 to 15 An automatic installation and testing device for a breather valve, as described in one embodiment of the present invention, is used to fill the workpiece 100 into the product 40; such as Figure 8 and Figure 9As shown, 41 indicates that workpiece 100 is not installed in product 40, and 42 indicates that workpiece 100 is installed in product 40; the appearance of product 40 is inspected; the automatic installation and detection equipment for the vent valve includes a conveying device 10 for carrying and conveying the product, an assembly detection device 20, and a feeding device 30; the assembly detection device 20 includes a fixed base 21, a folding robotic arm 22, and an assembly detection component 23; the fixed base 21 is fixedly installed on one side of the feeding device 30, and the folding robotic arm 22 is horizontally rotatably connected to the fixed base 21; the free end of the folding robotic arm 22 is rotatably connected to the assembly detection component 23; in use, the folding robotic arm 22, through horizontal rotation and its own bending, drives the assembly detection component 23 to grab the workpiece 100 from the feeding device 30 and fill it into the product 40 on the conveying device 10; after filling is completed, the assembly detection device 20 then inspects the appearance of the product 40 containing the workpiece 100. Specifically, the workpiece 100 is a vent valve, and the product 40 is a battery box or engine box, etc.

[0036] By rotating the folding robotic arm 22 on the fixed base 21, the gripping direction of the assembly and inspection component 23 is turned towards the side of the feeding device 30; by bending and folding the robotic arm 22 and rotating the assembly and inspection component 23, the gripping position of the assembly and inspection component 23 is adapted to the position of the workpiece 100 gripped on the feeding device 30; after the assembly and inspection component 23 grips the workpiece 100, by rotating the folding robotic arm 22, the assembly and inspection component 23 is rotated to the side of the product 40; then, by folding the robotic arm 22 and rotating the assembly and inspection component 23, the assembly and inspection component 23 is adapted to the position required for filling the product, and the workpiece 100 is filled onto the product 40; after filling is completed, by appropriately bending and folding the robotic arm 22 and rotating the assembly and inspection component 23... The inspection component 23 enables the assembly inspection component 23 to perform visual inspection on each side of the product 40. If it is found that individual workpieces 100 of the product 40 are not properly assembled or are missing, the folding robotic arm 22 and the assembly inspection component 23 work together to assemble the workpieces 100 in the product 40 or pick up the workpieces 100 from the feeding device 30 to fill the product 40. After completion, the appearance of the product 40 is inspected again by the folding robotic arm 22 and the assembly inspection component 23. If there are still problems with the product, the above steps are repeated. If the product appearance is well assembled, the product 40 is conveyed to the next process by the conveying device 10. In this embodiment, the surfaces of the product 40 that need to be filled and inspected are the top and four sides of the product 40.

[0037] The automatic installation and testing equipment for the vent valve in this application, through the cooperation of the folding robotic arm 22 and the assembly and testing component 23, effectively reduces the time for adjusting the position and angle of the equipment, thereby improving the efficiency of assembly and testing. For the product 40 that has been initially filled, the assembly and testing device 20 can also inspect its appearance to promptly detect any abnormal filling parts and refill them. This prevents defective products from entering the next process, effectively reducing the defect rate in the production process, thereby improving production quality and reducing the waste of raw materials and rework costs.

[0038] Please refer to this as well. Figure 12 and Figure 16 The assembly and inspection component 23 includes a robotic arm 231, a camera device 232, and a mechanical mounting base. The robotic arm 231 and the camera device 232 are mounted side by side on the mechanical mounting base. When the product 40 is conveyed to the working area of ​​the assembly and inspection component 23, the camera device 232 takes a comprehensive and detailed picture or scan of the appearance of the product 40 to check the unassembled workpieces 100 on the product 40. Then, the robotic arm 231 picks up the workpieces 100 from the feeding device 30 and accurately fills the workpieces 100 into the product 40. The assembly and inspection component 23 will then process the product... After the missing workpiece 100 in product 40 is assembled, the camera device 232 takes a picture or scans the appearance of product 40 to check whether there are any unassembled workpieces 100 or assembly defects on product 40. If there are defects, they are repaired. If product 40 is assembled correctly, it is conveyed away by the conveyor device 10. By using the parallel robotic arm 231 and camera device 232 to take pictures and record the robotic arm's installation and gripping in real time during the process of grasping and installing workpieces 100, the quality of the product is further improved and the defect rate of the product is reduced.

[0039] Please refer to this as well. Figure 12 and Figure 16The assembly and testing component 23 also includes a push cylinder 235. One end of the push cylinder 235 is mounted on the mechanical fixing base 233, and the other end is connected to the robot arm 231 via a spring. When the robot arm 231 needs to remove the workpiece 100 from the feeding device 30, the push cylinder 235 pushes the robot arm 231, causing the robot arm 231 to extend into the feeding device 30 and clamp the workpiece 100. Then, the push cylinder 235 is driven to cause the robot arm 231 to remove the workpiece 100 from the feeding device 30. When the robot arm 231 needs to remove the workpiece 100 from the feeding device 30, the push cylinder 235 pushes the robot arm 231 to remove the workpiece 100 from the feeding device 30. When the workpiece 100 is installed inside the product 40, the manipulator 231 inserts the workpiece 100 into the mounting port of the product 40 by driving the cylinder 235. Then, the manipulator 231 retracts by driving the cylinder 235. When the manipulator 231 inserts the workpiece 100 into the mounting port of the product 40, the spring can absorb and buffer the impact force that may be generated between the manipulator 231 and the mounting port, reducing damage to the workpiece 100, the manipulator and the product 40, and helping to improve the accuracy and stability of the installation. When the cylinder retracts, the spring can also assist the manipulator to quickly reset, improving work efficiency.

[0040] Please refer to this as well. Figure 12 and Figure 16 The mechanical mounting base 233 is provided with a first guide rail, and the camera device 232 is slidably mounted on the first guide rail. An aperture 234 for supplementary lighting is provided on the first guide rail opposite to the camera device 232. By sliding on the first guide rail, the camera device 232 can easily and quickly adjust its position according to different shooting needs to obtain the best angle and range for shooting the product 40, thereby capturing the installation information of the workpiece 100 more comprehensively and accurately. The aperture 234 can provide uniform light supplementation to the shooting area of ​​the camera device 232, reduce shadows and differences in brightness, and ensure the consistency of brightness and clarity of the captured image.

[0041] Please see Figures 6 to 9The folding robotic arm 22 includes a first folding arm 221 rotatably connected to a fixed base 21, a fourth folding arm 224 rotatably connected to an assembly and detection component 23, a second folding arm 222 hinged to the first folding arm 221, and a third folding arm 223 hinged to the fourth folding arm 224; the second folding arm 222 and the third folding arm 223 are hinged together. The assembly and detection component 23 also includes a device mounting base, on which a robotic arm 231 and a camera device 232 are mounted and fixed at one end, and the other end is rotatably connected to the fourth folding arm 224. Since the first folding arm 221 is rotatably connected to the fixed base 21 and the fourth folding arm 224 is rotatably connected to the assembly and detection component 23, the assembly and detection component 23 can be controlled to adjust the rotation angle between the folding robotic arm 22 and the fixed base 21 and the assembly and detection component 23. The product 40 is assembled and inspected on five sides. By controlling the rotation between the first folding arm 221 and the fixed base 21, the rotation angle of the entire folding robotic arm 22 can be changed, thereby driving the assembly and inspection component 23 to make basic orientation adjustments. The hinge design between the first, second, third, and fourth folding arms 224 allows them to rotate relative to each other. This rotation can fine-tune the specific position and angle of the assembly and inspection component 23 without changing the basic orientation. The four-segment folding arm design allows the assembly and inspection component 23 to flexibly adjust its position and angle in multiple dimensions to adapt to products 40 of different shapes, sizes, and positions, improving the versatility and adaptability of the equipment. Through multi-level rotation and fine-tuning, it can be ensured that the assembly and inspection component 23 accurately reaches the predetermined position, improving the accuracy of assembly and inspection.

[0042] Please see Figures 13 to 15 The conveying device 10 includes a conveyor belt 11 and a support tray 12 for carrying the product 40. A second guide rail is provided on the conveyor belt 11, and the support tray 12 slides on the second guide rail of the conveyor belt 11. The automatic vent valve also includes a limiting device 60, which includes positioning posts 61 on both sides of the conveyor belt 11. The top of the positioning posts 61 is connected by a crossbar 62. The crossbar 62 limits the height of the product 40 after it is lifted, so as to prevent the lifted product from being too high and hindering the loading and testing of the assembly and testing device.

[0043] Please see Figure 4 , Figures 6 to 9 The automatic venting valve also includes a lifting mechanism 50, which includes a lifting seat 51 and a cylinder 53. The lifting seat 51 is mounted on a conveying device 10 at the bottom of the support tray 12. The piston rod of the cylinder 53 passes through the lifting seat 51 and abuts against the support tray 12. The cylinder barrel of the cylinder 53 is fixed to the bottom of the lifting seat 51. Figure 4The conveyor belt 11 is also equipped with a first sensing probe 111. When the conveyor belt 11 transports the product 40 on the tray 12 to the side of the assembly and testing device 20, the first sensing probe 111 senses the position of the tray 12, and the cylinder 53 drives its piston rod to move upward, thereby moving the tray 12 and the product 40 on the tray 12 upward. This allows the product 40 to reach the height that matches the assembly and testing device 20, facilitating subsequent assembly or testing of the product 40 by the assembly and testing device 20. After the product 40 is cleaned and placed back on the tray 12, the cylinder 53, after sensing the position of the product 40 through the first sensing probe 111, will drive its piston rod to move downward, thereby moving the tray 12 and the product 40 downward until they are returned to the track of the conveyor device.

[0044] Please see Figures 6 to 9 The automatic installation and testing equipment for the vent valve also includes a rotating mechanism 70 disposed between the lifting mechanism 50 and the support tray 12; the rotating mechanism 70 includes an intermediate seat 71, the bottom of which is connected to the piston rod of the cylinder; a bearing 72 and a mounting seat 73 are disposed on the intermediate seat 71, the outer ring 721 of the bearing 72 is fixed to the intermediate seat 73, the inner ring 722 extends upward and is connected to the support tray 12, and a toothed ring 74 is sleeved on the extended inner ring 722; the mounting seat 73 is provided with a rack 75 and a drive mechanism. A drive module for moving rack 75, which meshes with gear ring 74; the drive module drives rack 75 to move back and forth, causing gear ring meshing with rack 75 to drive inner ring 722, causing pallet 12 to rotate in both directions. Assembly and testing device 20 only needs to be fixed at one side of product 40, and can assemble and photograph all four sides of product by rotating pallet 12; effectively improving the work efficiency of workpiece 100 loading and product photography; at the same time, it can also avoid omissions in inspection and loading, and improve the integrity of inspection and loading.

[0045] Please refer to the following: Figure 2 , Figures 13 to 15 The feeding device 30 includes a vibratory feeder 31 and a conveyor belt 32. A guide channel 33 is provided on the side wall of the vibratory feeder 31, spiraling upwards from the bottom of the vibratory feeder 31. The output end of the vibratory feeder 31 is connected to the input end of the conveyor belt 32. The feeding device 30 also includes a material distribution and positioning mechanism 34, which includes a material distribution and positioning seat 341 for accommodating the workpiece 100 and a drive cylinder 342 for driving the material distribution and positioning seat 341 outwards. The input end of the material distribution and positioning seat 341 is connected to the output end of the conveyor belt 32, and a discharge device is provided at the bottom of the vibratory feeder 31. Figure 14The material distribution positioning seat 341 is equipped with a second sensing probe 112; the discharge device discharges the workpiece 100 from the bottom of the vibrating plate 31 and arranges the workpiece 100 along the guide channel 33 on the edge of the vibrating plate 31; when the workpiece 100 is arranged to the material distribution positioning seat 341 of the material distribution positioning mechanism 34, the second sensing probe 112 senses that there is a workpiece 100 on the material distribution positioning seat 341, and drives the material distribution positioning mechanism 34 to push it towards the assembly detection device 20 through the drive cylinder 342; when the assembly detection device 20 removes the workpiece 100 from the material distribution positioning seat 341, the drive cylinder 342 passes through the second sensing probe 112 When the workpiece 100 on the material distribution positioning seat 341 is detected to be removed, the drive cylinder 342 will restart and push the material distribution positioning mechanism 34 back to the output end of the conveyor belt 32. Through the vibration of the vibrating plate 31, the workpiece 100 can be efficiently arranged and moved. With the spiral rising guide 33, the workpiece 100 can move to the conveyor belt 32 in an orderly manner, thereby ensuring the continuity and stability of the supply of workpiece 100. Through the detection of the second sensing probe 112, the presence of the workpiece 100 can be accurately sensed, and the workpiece 100 can be pushed to the assembly detection device 20 by the drive cylinder 342 to improve the accuracy and efficiency of assembly.

[0046] Please see Figure 2 , Figure 3 Since the workpiece 100 is prone to static electricity during transportation and assembly, the automatic installation and testing equipment for the vent valve is also equipped with an ion fan 100 for anti-static purposes. The ion fan 100 is respectively installed on one side of the feeding device 30 and the conveying device 10. The ion fan generates positive and negative ions to neutralize the static electricity generated during assembly and transfer, reduce the negative impact of static electricity on product quality and working environment, and improve production efficiency and product quality.

[0047] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An automatic installation and inspection device for a vent valve, used to load workpieces into a product and inspect the appearance of the product; characterized in that, The automatic installation and testing equipment for the vent valve includes a conveying device for carrying and conveying the product, an assembly and testing device, and a feeding device. The assembly and testing device includes a fixed base, a folding robotic arm, and an assembly and testing assembly. The fixed base is fixedly installed on one side of the feeding device, and the folding robotic arm is horizontally rotatably connected to the fixed base. The free end of the folding robotic arm is rotatably connected to the assembly and testing assembly. In use, the folding robotic arm, through horizontal rotation and its own bending, drives the assembly and testing assembly to grab the workpiece from the feeding device and fill it into the product on the conveying device. After filling, the assembly and testing device then inspects the appearance of the product containing the workpiece. The folding robotic arm includes a first folding arm rotatably connected to the fixed base, a fourth folding arm rotatably connected to the assembly and testing assembly, a second folding arm hinged to the first folding arm, and a third folding arm hinged to the fourth folding arm. The second folding arm is hinged to the third folding arm. The conveying device includes a conveyor belt and a tray for carrying the product, and a second guide rail is provided on the conveyor belt. The pallet is slidably mounted on the second guide rail of the conveyor belt; the vent valve further includes a lifting mechanism, which includes a lifting seat and a cylinder; the lifting seat is mounted on the conveying device at the bottom of the pallet, the piston rod of the cylinder passes through the lifting seat and abuts against the pallet, and the cylinder barrel is fixed to the bottom of the lifting seat; the lifting mechanism also includes multiple guide columns, which respectively pass through the lifting seat and connect to the pallet; the guide columns on both sides of the lifting seat are secured by fasteners. The guide column and the lifting seat are connected as one unit; the automatic installation and testing equipment for the vent valve also includes a rotating mechanism disposed between the lifting mechanism and the support tray; the rotating mechanism includes an intermediate seat, the bottom of which is connected to the piston rod of the cylinder; a bearing and a mounting seat are disposed on the intermediate seat, the outer ring of the bearing is fixed on the intermediate seat, the inner ring extends upward and is connected to the support tray; a toothed ring is sleeved on the extended inner ring, and a rack and a drive module for driving the rack to move are disposed on the mounting seat, the rack meshing with the toothed ring.

2. The automatic installation and testing equipment for the vent valve according to claim 1, characterized in that: The assembly and testing component includes a robotic arm, a camera device, and a mechanical mounting base, with the robotic arm and the camera device mounted side by side on the mechanical mounting base.

3. The automatic installation and testing equipment for the vent valve according to claim 2, characterized in that: The assembly and testing component also includes a push cylinder, one end of which is mounted on the mechanical mounting base, and the other end is connected to the robotic arm via a spring.

4. The automatic installation and testing equipment for the vent valve according to claim 2, characterized in that: The mechanical mounting base is provided with a first guide rail, and the camera device is slidably mounted on the first guide rail; an aperture for supplementary lighting is provided on the first guide rail opposite to the camera device.

5. The automatic installation and testing equipment for the vent valve according to claim 1, characterized in that: The feeding device further includes a material distribution and positioning mechanism, which includes a material distribution and positioning seat for accommodating the workpiece and a drive cylinder for driving the material distribution and positioning seat to push outward; the input end of the material distribution and positioning seat is connected to the output end of the conveyor belt.

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