Air conditioner chassis screw automatic spot welding system

Abstract

The automatic spot welding system for air conditioner chassis screws includes a screw feeding device, a positioning device, and a spot welding device. Each of the above devices is connected to a control system. The screw feeding device includes a vibration plate, which is connected to the control system. The positioning device is composed of at least 4 sets of rough positioning mechanisms and 1 set of fine positioning mechanisms distributed front and back. The rough positioning mechanism includes four rough positioning cylinders located on both sides of the chassis. The cylinder rods of the two rough positioning cylinders in the left and right directions are connected with angle iron-shaped positioning plates. The cylinder rod ends of the two rough positioning cylinders in the front and back directions are hinged on the driving rod. The fine positioning mechanism is arranged in cooperation with the frontmost rough positioning mechanism. The spot welding device includes three spot welding machines, which are arranged in cooperation with the three rear rough positioning devices. This system realizes automatic spot welding of screws.

Description

Technical Field

[0001] The invention relates to automatic machine equipment in air conditioner production, in particular to an automatic spot welding system for air conditioner chassis screws. Background Art

[0002] In the manufacture of air conditioners, three screws for fixing the compressor need to be fixed and welded on the chassis. The current chassis has three screw holes reserved during production. These three screw holes are located on the same circle. The operation is to insert screws of suitable models into these three screw holes, and then fix the screws and the chassis together through spot welding machines. In the current production of air conditioner chassis, this operation is done manually. On the one hand, there is currently no such automated equipment to achieve this function. On the other hand, it is difficult to develop equipment with this function. The reason is that the factory produces many models of air conditioners, and the positions of the screw holes on the chassis of different models are different, so it is difficult for one set of equipment to meet the needs of multiple models. In order to meet the needs of air-conditioning production, it is currently possible to sort the screws using a vibration plate in many situations in production. The sorted screws can be arranged in front-to-back order according to the design requirements, but how to make the sorted screws accurately enter the three screw holes on the chassis, and how to automatically adjust according to different types of chassis during feeding cannot be achieved on current equipment. After the screws are fed into the screw holes, they need to be spot-welded on a spot welding machine. The current welding of air-conditioning chassis screws is still done manually, but with the increase in labor costs and the many uncertainties brought about by manual work in production practice, the development of automatic welding equipment for air-conditioning chassis screws is a necessary means of development. Summary of the invention

[0003] The purpose of the present invention is to overcome the problems existing in the current production of air-conditioning chassis, such as shortage of automated equipment, high labor cost, low efficiency, etc., and to provide an automatic spot welding system for air-conditioning chassis screws.

[0004] In order to achieve the purpose of the present invention, the following technical scheme is adopted: an automatic spot welding system for air conditioner chassis screws, including a screw feeding device, a positioning device, and a spot welding device, wherein the above devices are connected to a control system.

[0005] The screw feeding device includes a vibrating plate, which is connected to a control system. The vibrating plates are one or more groups, each group has 3 pieces. The end of the vibrating plate is provided with a slit track, and the sorted screws are hung in the slit track. A cutting plate is rotatably arranged on a feeding frame in the end of each slit track. The end of each slit track is located at the edge of the cutting plate. One or more groups of feeding holes are provided on the cutting plate, and each group of feeding holes is composed of 3 evenly distributed feeding holes. A feeding slit leading to the feeding hole is provided from the edge of the cutting plate. A rotating driving device is connected to the cutting plate, and the rotating driving device drives the cutting plate to rotate back and forth. When the slit is connected to the feeding slit, the rotating driving device drives the cutting plate to rotate, and the screw passes through the feeding slit and finally enters the feeding hole. Multiple groups of feeding pipes are provided on the feeding frame under the cutting plate, and each group of feeding pipes consists of The invention is composed of 3 evenly distributed feeding pipes, the position of each feeding pipe corresponds to the position of the feeding hole after the cutting disk carries the screw to rotate, and 3 supporting pipes located on the same circumference are arranged below the feeding pipe, and each feeding pipe in each group of feeding pipes is connected to a supporting pipe through a feeding hose, and a supporting device is arranged in or under the supporting pipe near the screw outlet, and each supporting pipe is fixedly connected to a cylinder frame, and upper and lower cylinders are fixedly connected to the cylinder frame, and a clamping cylinder is connected to the cylinder rod of the upper and lower cylinders, and the clamping hole of the clamping cylinder is located below the feeding pipe, and a diameter adjusting mechanism is arranged in cooperation with the feeding pipe, and the diameter adjusting mechanism includes a diameter adjusting plate, and a plurality of cam-shaped strip holes are evenly distributed on the diameter adjusting plate, and the feeding pipe is inserted in the strip hole, and the diameter adjusting plate is rotatably arranged on the diameter adjusting frame, and a rotating driving power device is connected to the diameter adjusting plate. A radial guide plate is fixedly connected to the diameter adjustment frame, a radial guide groove is provided on the radial guide plate, each supporting tube is radially slidably arranged in the guide groove or radially slidably arranged in the guide groove through a guide block, and the rotation drive device, the rotation power drive device, and each cylinder are controlled by a control system;

[0006] The positioning device is composed of at least 4 sets of rough positioning mechanisms and 1 set of fine positioning mechanism distributed front and back. The rough positioning mechanism includes four rough positioning cylinders located on both sides of the chassis, two of which are in the left and right directions and two in the front and back directions. The cylinder rods of the two rough positioning cylinders in the left and right directions are connected with angle iron-shaped positioning plates, and the cylinder rod ends of the two rough positioning cylinders in the front and back directions are hinged on the driving rod. A rough positioning rod is arranged in the rough positioning mechanism, and the rear ends of the rough positioning rods are hinged on the driving rod. The rough positioning rods are rotatably arranged. In each set of rough positioning mechanisms, two angle iron-shaped positioning plates are close to the two corners of the front part of the chassis; two rough positioning rods are close to the two corners close to the rear part of the chassis; the fine positioning mechanism is cooperatively arranged at the frontmost rough positioning mechanism, including three positioning posts located on the same circle, the upper ends of the positioning posts are conical, and the three positioning posts The three precision positioning cylinders are respectively connected to the cylinder rods of the three vertical directions, and the three precision positioning cylinders are limited on the reducing mechanism. The reducing mechanism includes a reducing disk, on which three cam holes are opened, and a cylindrical plug post is provided at the lower part of the three precision positioning cylinders. Each precision positioning cylinder is inserted in the cam hole through the plug post, and a radial slider is connected to the plug post. Each radial slider is slidably set in a corresponding radial groove, and a long hole for the plug post to pass through is provided on the bottom surface of the radial groove. The bottom surface of the slider is supported on the bottom surface of the radial groove, and the three radial grooves are fixedly connected to the positioning frame. A reducing drive shaft is fixedly connected to the center of the reducing disk, and the reducing drive shaft is rotatably connected to the positioning frame. A reducing motor for driving the reducing drive shaft to rotate is arranged on the positioning frame, and the bottom of the positioning frame is rotatably connected to the base through the positioning frame shaft; the three positioning posts in the precision positioning mechanism are directly opposite to the three supporting tubes up and down;

[0007] The spot welding device comprises three spot welding machines, which are respectively arranged at the three sets of rough positioning devices at the back, and are all connected to a corresponding three-axis system.

[0008] Furthermore, it also includes a chassis conveying device, which includes a plate chain conveyor, and a plurality of groups of pushing blocks are arranged at intervals on the plate chain of the plate chain conveyor, each group of blocking blocks is composed of two pushing blocks in the left and right directions, and the pushing blocks are fixedly connected to the plate chain; both sides of the plate chain conveyor have fixed support plates in the length direction, and the bottom surface of the fixed support plates is not lower than the plane of the plate chain, and the chassis is supported on the fixed support plates. When the plate chain conveyor is in motion, the pushing blocks push the chassis forward, and the plate chain conveyor is connected to the control system for control.

[0009] Furthermore; the diameter adjusting frame is rotatably connected to the base through the diameter adjusting frame shaft, the base is fixedly connected to the two-axis planar moving mechanism A, and a diameter adjusting frame driving motor for driving the diameter adjusting frame to rotate is arranged on the base, and the base in the precise positioning mechanism is connected to the two-axis planar moving system B, and the two-axis planar moving mechanisms all adopt a slide mechanism driven by a screw, and a positioning frame shaft driving motor for driving the positioning frame shaft to rotate is arranged on the base.

[0010] Furthermore; there are 2 groups of vibration plates, the vibration plates in the two groups are arranged alternately, there are 6 feeding slits, the rotation driving device is a cutting plate driving cylinder, one end of the cutting plate driving cylinder is hinged on the frame, the cylinder rod end is connected with a joint bearing, and a shaft connected to the cutting plate is passed through the joint bearing; there are two groups of feeding pipes, and a Y-shaped tee is arranged on the upper end of the supporting pipe. Every two feeding pipes in different groups are connected to the same supporting pipe through a Y-shaped tee by a hose. The feeding slit is arc-shaped, and the upper opening of the feeding pipe is a trumpet mouth with a larger upper part and a smaller lower part. A plurality of groove wheels are installed around the cutting plate, and the cutting piece is located in the groove of the groove wheel.

[0011] Furthermore; the rotating driving power device connected to the diameter adjusting plate is a diameter adjusting motor, and a central shaft is fixedly connected to the center of the diameter adjusting plate. The diameter adjusting motor directly drives the central shaft or drives the central shaft through a transmission mechanism. The transmission mechanism includes belt drive, gear drive, and chain drive.

[0012] Furthermore; the supporting device is a multi-petal spring sheet, and a screw through hole is formed in the middle of the multi-petal spring sheet. When the screw falls, the rod passes through the through hole and the head falls on the spring sheet. The supporting device is arranged in the supporting tube or is arranged in the following manner: the cylinder frame is fixedly connected to the lower end of the supporting tube, and there is a material passing hole on the cylinder frame that communicates with the supporting tube, and the supporting device is arranged in the material passing hole.

[0013] Furthermore; the supporting device includes at least three marbles evenly distributed along the circumference, a marble hole is opened on the hole wall through which the screw falls, the marble mouth is close to the lower end of the supporting tube, the diameter of the marble hole is smaller than the diameter of the axis of the marble along the radial direction of the marble hole, a spring is provided on the radial outer top of the marble, the outer end of the spring is tightened by a bolt screwed into the marble hole, when the screw falls, the rod passes through the hole between the three marbles, and the head falls on the marble, and the marble is spherical or ellipsoidal.

[0014] Furthermore, a material sensing photoelectric switch is installed on the frame near the end of the clamping track, and the material sensing photoelectric switch is connected to the control system. The clamping cylinder has a magnetic switch, and the magnetic switch is connected to the control system.

[0015] Furthermore; the feeding device also includes a feeding device, and the vibration plate feeding device includes a total vibration plate machine, the total vibration plate machine is located above each vibration plate, and a hopper with three feeding holes at the bottom is arranged under the discharge channel of the total vibration plate machine, and the hopper is divided into three parts by three spacers, and there is a feeding hole between every two spacers, and the hopper is connected to the output of the feeding motor, and a feeding chute is arranged below the feeding hole of the hopper, and a baffle is arranged between every two feeding chutes, and the baffle is located between the two feeding chutes, and the baffle and the feeding chute are fixedly connected to the conversion frame, and the conversion frame is rotatably connected to an axis with the center of the hopper as the axis, and a rotation driving device is connected to the conversion frame. After the rotation driving device drives the conversion frame to rotate, the outlet of the feeding chute is switched to connect with the inlet of another group of three vibration plates.

[0016] Furthermore; the rear ends of the two coarse positioning cylinders located on one side of the chassis in the coarse positioning mechanism are hinged on the frame, the rear part of the coarse positioning rod is V-shaped, the coarse positioning rod is rotatably connected to the frame, the rear ends of the two coarse positioning cylinders located on the other side of the chassis are hinged on the adjustment plate, the adjustment plate is slidably connected to the frame in the left and right directions, the coarse positioning rod on this side is rotatably connected to the adjustment plate, a rack is fixedly connected to the adjustment plate, a gear is provided in conjunction with the rack, and the gear is connected to the output shaft of the adjustment plate adjustment motor.

[0017] The positive and beneficial technical effects of the present invention are: the system realizes automatic feeding of screws, accurate hole insertion, and automatic spot welding, can automatically adjust the feeding position according to the different sizes of the circles formed by the three screw holes on the chassis, and can adjust the positions of the feeding equipment, positioning equipment, and spot welding equipment according to the different positions of the three screw holes. The production line has strong adaptability and can effectively reduce costs and improve efficiency when used in the automatic welding of air-conditioning chassis screws. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of one aspect of the present invention as a whole.

[0019] Figure 2 It is a schematic diagram of another aspect of the present invention as a whole.

[0020] Figure 3 It is a schematic diagram of the feeding device viewed from above.

[0021] Figure 4 It is a schematic diagram of the feeding device after removing the total vibrating plate machine process when viewed from above.

[0022] Figure 5 It is a partial schematic diagram of the lower part of the cutting disc of the feeding device.

[0023] Figure 6 It is a partial schematic diagram of the feeding device after removing the vibration plate machine part of the shell.

[0024] Figure 7 It is a schematic diagram of the lower half of the feeding device.

[0025] Figure 8 It is a schematic diagram of the bottom of the feeding device viewed from above.

[0026] Fig. 9 It is a schematic diagram of the diameter adjustment plate.

[0027] Fig.10 This is a schematic diagram of one type of support device.

[0028] Fig.11 This is one of the schematic diagrams of the front positioning device.

[0029] Fig.12 It is a schematic diagram of the internal part of one side of the positioning device as seen from the outside.

[0030] Fig.13 Schematic diagram of the front positioning device 2.

[0031] Fig.14 One of the schematic diagrams of the precision positioning mechanism.

[0032] Fig.15 The second schematic diagram of the precision positioning mechanism. DETAILED DESCRIPTION

[0033] In order to more fully explain the implementation of the present invention, embodiments of the present invention are provided. These embodiments are merely elaborations of the present invention and do not limit the scope of the present invention.

[0034] The present invention is further explained in detail in conjunction with the accompanying drawings, in which the respective marks are: 101: feeding frame; 102: total vibrating plate machine; 103: hopper; 104: unloading chute; 105: vibrating plate; 106: two-axis plane moving mechanism; 107: cutting plate; 108: unloading pipe; 109: unloading channel of the total vibrating plate machine; 110: material distribution motor; 111: material distribution hole; 112: baffle; 113: spacer; 114: gap track; 115: unloading hole; 116: material gap; 117: bell mouth; 118: groove wheel; 119: conversion frame rotation drive cylinder; 120: rotating frame; 121: conversion frame; 122: cutting plate driving cylinder Cylinder; 123: Spherical bearing; 124: Y-shaped tee; 125: Diameter adjustment plate; 126: Strip hole; 127: Material support tube; 128: Cylinder frame; 129: Upper and lower cylinders; 130: Clamping claw cylinder; 131: Diameter adjustment motor; 132: Synchronous wheel connected to the center axis of the diameter adjustment plate; 133: Synchronous belt driven by the diameter adjustment motor; 134: Base; 135: Diameter adjustment frame driving motor; 136: Diameter adjustment frame shaft rotatably connected to the base; 137: Diameter adjustment frame Synchronous belt driven by driving motor; 138: diameter adjustment frame; 139: spring; 140: outline of cam-shaped strip hole; 141: marble; 142: spring; 143: bolt; 144: hole through which the screw passes; 145: guide plate; 146: guide groove; 147: guide block; A; 201: two-axis plane moving mechanism B; 202: coarse positioning cylinder A; 203: coarse positioning cylinder B; 204: angle iron positioning plate 1; 205: coarse positioning cylinder C; 206: coarse positioning cylinder D; 207: angle iron positioning plate 2; 208: frame of positioning mechanism; 209: coarse positioning rod 1; 210: coarse positioning rod 2; 211: driving plate; 212: adjusting plate; 213: rack; 214: gear; 215: adjusting motor; 216: guide rail; 217: fine positioning cylinder; 218: positioning column; 210: reducing disk; 220: cam hole; 221: radial groove; 222: guide block; 223: plug column; 224: long hole; 225: positioning frame; 226: variable diameter motor; 227: synchronous wheel connected to the variable diameter driving shaft; 228: base; 229: positioning frame shaft driving motor; 301: spot welding machine A; 302: spot welding machine B; 303: spot welding machine C; 401: plate chain conveyor; 402: push block; 501: chassis.

[0035] As shown in the attached figure, the automatic spot welding system for air conditioner chassis screws includes a screw feeding device, a positioning device, and a spot welding device. The above devices are connected to the control system.

[0036] The screw feeding device includes a feeding frame 101 and a vibration plate, 105 is shown as the vibration plate, the vibration plate is connected to the control system, the vibration plate is one or more groups, each group has 3, the end of the vibration plate has a slot track, 114 is shown as the slot track, the sorted screws are hung in the slot track.

[0037] A cutting disc 107 is rotatably arranged on the frame at the end of each gap track, and a plurality of groove wheels 118 are installed around the cutting disc. The cutting disc is located in the groove of the groove wheel, and the end of each gap track is located at the edge of the cutting disc. One or more groups of feeding holes are provided on the cutting disc, and each group of feeding holes is composed of 3 evenly distributed feeding holes, 115 is shown as a feeding hole, and a feeding slit leading to the feeding hole is provided from the edge of the cutting disc, 116 is shown as a feeding slit, and the feeding slit is arc-shaped. The number of vibration discs described in this embodiment is 2 groups, and the vibration discs in the two groups are alternately arranged, and there are 6 feeding slits. A material sensing photoelectric switch is installed on the frame near the end of the gap track, and the material sensing photoelectric switch is connected to the control system. The material sensing photoelectric switch is often used to detect materials. This method is very common and is not shown in the figure.

[0038] A rotary drive device is connected to the cutting disc, and the rotary drive device drives the cutting disc to rotate back and forth. In this embodiment, the rotary drive device is a cutting disc drive cylinder, and 122 is a cutting disc drive cylinder. One end of the cylinder is hinged on the frame, and the cylinder rod end is connected to a joint bearing 123, and a shaft connected to the cutting disc is penetrated in the joint bearing; when the gap is connected to the material gap, the rotary drive device drives the cutting disc to rotate, and the screw passes through the material gap 116 and finally enters the feeding hole 115. In this embodiment, 2 groups of 6 vibration discs are configured, and only one group works during operation. The cylinder can cut the screw into the corresponding material gap from the gap track of one group of vibration discs when advancing, and does not cut the material when retracting. When the vibration disc is converted to another group, the cylinder changes to cut the screw into the corresponding material gap from the gap track of the corresponding vibration disc when retracting, and does not cut the material when advancing.

[0039] A plurality of groups of feed pipes are arranged on the frame under the cutting disc. In the present embodiment, there are two groups of feed pipes, and each group of feed pipes is composed of three evenly distributed feed pipes. 108 in the figure is a feed pipe, and the upper opening of the feed pipe is a trumpet mouth with a larger upper part and a smaller lower part. 117 is a trumpet mouth, and the position of each feed pipe corresponds to the position of the feed hole after the cutting disc carries the screw to rotate.

[0040] Three supporting pipes are arranged on the same circumference below the feeding pipe. 127 is a supporting pipe. A Y-shaped tee is arranged on the upper end of the supporting pipe. 124 is a Y-shaped tee. Every two feeding pipes in different groups are connected to the same supporting pipe through a hose through the Y-shaped tee. The hose can be an elastic hose, which is a common material. The hose is not shown in the figure. Each feeding pipe in each group of feeding pipes is connected to a supporting pipe through a feeding hose.

[0041] A supporting device is arranged in the supporting tube near the screw outlet or under the supporting tube. The supporting device can be one of the following two types: one is: the supporting device is a multi-petal spring sheet, 139 is a spring sheet, a screw through hole is formed in the middle of the multi-petal spring sheet, when the screw falls, the rod passes through the through hole, and the head falls on the spring sheet, the supporting device is arranged in the supporting tube or is arranged in the following manner: the cylinder frame 128 is fixedly connected to the lower end of the supporting tube, and there is a material passing hole on the cylinder frame that communicates with the supporting tube, and the supporting device is arranged in the material passing hole. Figure 8 As shown, in this embodiment, the spring piece is installed in the feeding hole. Another is: the supporting device includes at least three marbles evenly distributed along the circumference, 141 is a marble, a marble hole is opened on the hole wall through which the screw falls, 144 is the hole through which the screw falls, the marble mouth is close to the lower end of the supporting tube, the diameter of the marble hole is smaller than the diameter of the axis of the marble along the radial direction of the marble hole, a spring 142 is provided on the radial outer top of the marble, the outer end of the spring is tightened by a bolt 143 screwed into the marble hole, when the screw falls, the rod passes through the hole between the three marbles, and the head falls on the marble, the marble is spherical or ellipsoidal. When the marble is ellipsoidal, the aperture of the marble hole is smaller than the length of the short axis of the ellipsoid.

[0042] A cylinder frame 128 is fixedly connected to each supporting tube, and an upper and lower cylinder 129 is fixedly connected to the cylinder frame. A clamping cylinder 130 is connected to the cylinder rod of the upper and lower cylinders. The clamping hole of the clamping cylinder is located below the supporting tube. The clamping cylinder has a magnetic switch, which is connected to the control system. The magnetic switch can be used to detect the stroke of the clamping cylinder. When the clamping cylinder clamps the screw and does not clamp the screw, the stroke is different, so whether the clamping cylinder clamps the screw can be judged according to the magnetic switch signal.

[0043] A diameter adjusting mechanism is provided in conjunction with the material supporting tube, and the diameter adjusting mechanism comprises a diameter adjusting plate 125, on which a plurality of cam-shaped strip holes are evenly distributed, 126 being a cam-shaped strip hole, the circumferential contour line of the cam strip hole being a cam centered on the diameter adjusting plate, 126 being a cam-shaped strip hole, 140 being a circumferential contour line of the cam-shaped strip hole, the material supporting tube is inserted into the cam-shaped strip hole, the diameter adjusting plate is rotatably provided on the diameter adjusting frame 138, a rotation driving power device is connected to the diameter adjusting plate, the rotation driving power device connected to the diameter adjusting plate is a diameter adjusting motor, 131 in the figure is a diameter adjusting motor, a central shaft is fixedly connected to the center of the diameter adjusting plate, 132 is a synchronous wheel connected to the central shaft of the diameter adjusting plate, the diameter adjusting motor directly drives the central shaft or drives the central shaft through a transmission mechanism, and the transmission mechanism can also be belt drive, gear drive, or chain drive, and in this embodiment, synchronous belt and synchronous wheel drive are used. As shown in the figure, the diameter adjusting motor drives the central shaft to rotate and adjust through the synchronous belt driven by the diameter adjusting motor. The diameter motor drives the diameter adjusting plate to rotate by driving the central shaft. Under the action of the cam-shaped strip hole, the three supporting tubes move synchronously inward or outward in the radial direction of the circle centered on the diameter adjusting plate. The three supporting tubes are always located on a circle centered on the center of the diameter adjusting plate during or after adjustment.

[0044] A radial guide plate 145 is fixedly connected to the diameter adjustment frame 138, and a radial guide groove 146 is provided on the radial guide plate. Each material support tube is radially slidably arranged in the guide groove or radially slidably arranged in the guide groove through a guide block, and the rotation drive device, the rotation power drive device, and each cylinder are controlled by a control system. In this embodiment, a guide block 147 is connected to each material support tube, and the guide block is slidably arranged in the guide groove, and the lower surface of the guide block is supported on the bottom surface of the guide groove. The diameter adjustment frame 138 is rotatably connected to the base 134 through the diameter adjustment frame shaft, and the base is fixedly connected to the two-axis plane moving mechanism A106. A diameter adjustment frame drive motor 135 for driving the diameter adjustment frame to rotate is arranged on the base.

[0045] More optimally, the feeding device also includes a material distribution device, and the vibration plate material distribution device includes a total vibration plate machine 101, the total vibration plate machine is located above the vibration plate, and a hopper 103 with three material distribution holes at the bottom is arranged under the discharge channel 109 of the total vibration plate machine. The hopper is divided into three parts by three spacers 113, and there is a material distribution hole 111 between every two spacers. The hopper is connected to the output of the material distribution motor 110, and a material discharge chute 104 is arranged below the hopper discharge hole, and a baffle 112 is arranged between every two material discharge chute. The baffle position Between the two material discharge chutes, the baffle and the material discharge chutes are fixedly connected to the conversion frame 121, and the conversion frame 121 is rotatably connected to an axis with the center of the hopper as the axis. A rotation driving device is connected to the conversion frame. After the rotation driving device drives the conversion frame to rotate, the outlet of the material discharge chute is switched to connect with the inlet of another group of three vibration plates. In this embodiment, the rotation driving device adopts a conversion cylinder 119; one end of the conversion cylinder is hinged on the feeding machine frame, and the other end is hinged to the rotating frame 120. The rotating frame is rotatably connected to the feeding frame, and the conversion frame and the rotating frame are fixedly connected.

[0046] The positioning device is composed of at least 4 sets of coarse positioning mechanisms distributed front and back and 1 set of fine positioning mechanism. The frontmost set of the 4 sets of coarse positioning mechanisms cooperates with the fine positioning mechanism to accurately insert the screws into the screw holes on the chassis, and the rear three sets are used for positioning when spot welding the three screws. The 4 sets of coarse positioning mechanisms are the same. Here, only the frontmost set of coarse positioning mechanisms is introduced in detail in combination with the figure.

[0047] The coarse positioning mechanism includes four coarse positioning cylinders located on both sides of the chassis, the four coarse positioning cylinders in the figure are coarse positioning cylinder A shown in 202, coarse positioning cylinder B shown in 203, coarse positioning cylinder C shown in 205, and coarse positioning cylinder D shown in 206; two of the four coarse positioning cylinders in the figure are in the left and right directions, and two are in the front and back directions. The coarse positioning cylinder A and the coarse positioning cylinder C in the figure are in the front and back directions, and the coarse positioning cylinder B and the coarse positioning cylinder D are in the left and right directions. Angle iron-shaped positioning plates are connected to the cylinder rods of the two coarse positioning cylinders in the left and right directions. Angle iron-shaped positioning plates 1 and 2 are in the figure. The positioning plate 2 is connected to the cylinder rods of the coarse positioning cylinder B and the coarse positioning cylinder D respectively. The cylinder rod ends of the two coarse positioning cylinders in the front and rear directions are hinged on the driving rod. 211 in the figure shows the driving rod. A coarse positioning rod is provided in the coarse positioning mechanism. 209 and 210 in the figure show two coarse positioning rods. The rear ends of the coarse positioning rods are hinged on the driving rod. The coarse positioning rods in each coarse positioning mechanism are hinged on the same driving rod. The coarse positioning rods are rotatably arranged. The two angle iron-shaped positioning plates in each set of coarse positioning mechanisms are close to the two corners of the front part of the chassis; the two coarse positioning rods are close to the two corners near the rear part of the chassis. The rear portion of the coarse positioning rod is V-shaped, and the rear ends of the two coarse positioning cylinders on one side of the chassis in the coarse positioning mechanism are hinged on the frame, and the coarse positioning rod is rotatably connected to the frame. The rear ends of the two coarse positioning cylinders on the other side of the chassis are hinged on the adjustment plate 212, and the adjustment plate 212 is slidably connected to the frame in the left and right directions. In this embodiment, the adjustment plate is slidably connected to the frame by a guide rail 216, and the coarse positioning rod on this side is rotatably connected to the adjustment plate 212, and a rack 213 is fixedly connected to the adjustment plate, and a gear 214 is provided in conjunction with the rack, and the gear is connected to the output shaft of the adjustment plate adjustment motor 215.

[0048] The fine positioning mechanism is arranged in cooperation with the rough positioning mechanism at the front, and includes three positioning posts located on the same circle, 223 is a positioning post, and the upper end of the positioning post is conical, as shown in FIG. Fig.14 , Fig.15As shown, the three positioning posts are respectively connected to the cylinder rods of the three vertical precision positioning cylinders. The three positioning posts in the precision positioning mechanism are directly opposite to the three supporting tubes. 217 shows the precision positioning cylinder. The three precision positioning cylinders are limited on the variable diameter mechanism. The variable diameter mechanism includes a variable diameter disk 219. Three cam holes 220 are opened on the variable diameter disk. In order to distinguish them, different names are given. The cam hole refers to the cam with the contour line of the circumference of the hole centered on the variable diameter disk. The cam hole has the same meaning as the cam-shaped strip hole mentioned above. The cam The peripheral contour of the hole is also shown as 140. The lower part of the three precision positioning cylinders has a cylindrical plug column, 223 is the plug column, each precision positioning cylinder is inserted into the cam hole through the plug column, and a radial slider is connected to the plug column. 222 is a radial slider, and each radial slider is slidably set in a corresponding radial groove. 221 is a radial groove. The three radial grooves are located on the variable diameter disk, and the bottom surface of the radial groove is provided with a long hole 224 for the plug column to pass through. The bottom surface of the slider is supported on the bottom surface of the radial groove. The three radial grooves are fixedly connected to the positioning On the frame 225, the center of the variable diameter disk is fixedly connected with a variable diameter drive shaft, which is rotatably connected to the positioning frame. A variable diameter motor 226 for driving the variable diameter drive shaft to rotate is arranged on the positioning frame. 227 is a synchronous pulley connected to the variable diameter drive shaft. The variable diameter motor drives the variable diameter drive shaft through a synchronous belt. When the variable diameter motor rotates, the variable diameter disk is driven to rotate. Under the action of the cam hole, the three plug posts move synchronously inward or outward in the radial direction of the circle centered on the variable diameter disk. The three plug posts are always located in one position during or after adjustment. On a circle with the center of the variable diameter disk as the center, this is the variable diameter adjustment that can be achieved by the cam hole. The bottom of the positioning frame 225 is rotatably connected to the base 228 through the positioning frame shaft. A positioning frame shaft driving motor 229 is provided on the base to drive the positioning frame shaft to rotate, and a synchronous pulley can be connected to the positioning frame shaft; the positioning frame shaft driving motor 229 drives the positioning frame to rotate through a synchronous belt. The base in the precise positioning mechanism is connected to the two-axis planar moving system B201, and the two-axis planar moving mechanisms all use a slide mechanism driven by a screw.

[0049] The spot welding device includes three spot welding machines, as shown in 301, 302, and 303 in the figure. The spot welding machines are mature products and can be purchased from the market. The three welding devices are respectively arranged at the rear three sets of rough positioning devices. The three spot welding machines are all connected to a three-axis system, and the spot welding machines are equipped with a mature three-axis system.

[0050] The automatic welding system further includes a chassis conveying device, which includes a plate chain conveyor 401. A plurality of groups of pusher blocks are arranged at intervals on the plate chain of the plate chain conveyor. 402 is a pusher block. Each group of block blocks is composed of two pusher blocks in the left and right directions. The pusher blocks are fixedly connected to the plate chain. Both sides of the plate chain conveyor have fixed support plates in the length direction. The bottom surface of the fixed support plate is not lower than the plane of the plate chain. The chassis is supported on the fixed support plate. When the plate chain conveyor is in motion, the pusher blocks push the chassis forward. The plate chain conveyor is connected to the control system for control. The chassis is pushed forward on the plate chain conveyor by the pusher blocks, so that each workstation pushes the material step by step, instead of the friction between the plate chain and the chassis driving the chassis forward. The plate chain conveyor can be loaded manually or by robots. It can also be equipped with a pusher device with a conveyor belt to push the chassis onto the plate chain conveyor.

[0051] The working process of this system is as follows: the screws are loaded into the main vibrating plate machine, and the screws are sorted from the main vibrating plate machine and flow into the hopper from the feeding channel. The hopper rotates under the drive of the feeding motor, and when the feeding hole and the baffle are staggered, the screws fall into the vibrating plate from the corresponding feeding chute to complete the feeding.

[0052] The screws in the vibrating plate are arranged on the gap track after being sorted by the vibrating plate. When the cylinder of the cutting plate is in a state, a group of feeding gaps are connected with a group of gaps on the gap track. At this time, the screws can enter the feeding gaps, and the cylinder of the cutting plate moves to cut three screws into the feeding gaps at the same time. During the rotation of the cutting plate, the screws on the gap track cannot enter the feeding hole due to the limit of the edge of the cutting plate. At this time, the rotation position of the cutting plate is just above the feeding hole, so the three screws will fall into the lower feeding tube. After reaching the supporting pipe from the discharge pipe through the discharge hose and the Y-shaped tee, the heads of each screw fall on the supporting device. At this time, the upper and lower cylinders move up, the clamping cylinder moves, and the clamping claw clamps the rod of the screw. At this time, the positioning device has already positioned the chassis, and the three positioning columns are located in the three screw holes. The upper and lower cylinders move down, and each screw is pulled down from the supporting device and sent into the screw holes on the chassis below. The upper and lower cylinders move down and the precision positioning cylinder moves down at the same time, and the positioning columns move out of the screw holes. The control system controls the cutting disc to continue cutting into the next group of screws.

[0053] After the screws are inserted, the chassis is transported backward on the plate chain conveyor. The driving rod drives each rough positioning rod to complete the rough positioning of the chassis at each station. At each spot welding station, one screw is spot welded. Since the spot welding electrode and the screw head are relatively large, only rough positioning is required during spot welding. After three spot welding stations, the welding between the screw and the chassis is completed.

[0054] When changing production, when the diameter of the circle formed by the three screw holes on the air conditioning panel changes, the diameter adjustment motor drives the diameter adjustment plate to rotate. Since the upper part of the support tube is connected to a hose, the adjustment plate rotates to push the support tube to move radially. Due to the circumferential limit of the radial guide plate, the support tube will not move in the circumferential direction. If the center position of the three screw holes remains unchanged, it can be adjusted by rotating the diameter adjustment plate and the diameter reducing plate. If the position of the three screws changes, the fine positioning mechanism and the support tube can be moved to the corresponding position by the two-axis plane moving mechanism A and the two-axis plane moving mechanism. The upper and lower alignment can be achieved by rotating the diameter adjustment frame and the diameter reducing frame in the circumferential direction. After the chassis size changes, the position of the adjustment plate can be adjusted in the left and right directions by adjusting the gear rack to make the coarse positioning mechanism adapt to the change requirements in the width direction of the bottom plate.

[0055] When the screw model needs to be changed, after all the screws in the total vibration plate machine are unloaded, start the conversion cylinder, the conversion frame rotates to drive the unloading chute to rotate to the corresponding position of another set of vibration plates, and feeds materials from another set of vibration plates. This is the reverse of the working position of the cutting plate driving cylinder to cut materials and it can work normally.

[0056] After describing the implementation mode of the present invention in detail, people familiar with the technology can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent application. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention, and the present invention is not limited to the implementation mode of the examples given in the specification.

Claims

1. The automatic spot welding system for air conditioner chassis screws includes a screw feeding device, a positioning device, and a spot welding device. The above devices are connected to a control system and are characterized by: The screw feeding device includes a vibrating plate, which is connected to a control system. The vibrating plates are one or more groups, each group has 3 pieces. The end of the vibrating plate is provided with a slit track, and the sorted screws are hung in the slit track. A cutting plate is rotatably arranged on a feeding frame in the end of each slit track. The end of each slit track is located at the edge of the cutting plate. One or more groups of feeding holes are provided on the cutting plate, and each group of feeding holes is composed of 3 evenly distributed feeding holes. A feeding slit leading to the feeding hole is provided from the edge of the cutting plate. A rotating driving device is connected to the cutting plate, and the rotating driving device drives the cutting plate to rotate back and forth. When the slit is connected to the feeding slit, the rotating driving device drives the cutting plate to rotate, and the screw passes through the feeding slit and finally enters the feeding hole. Multiple groups of feeding pipes are provided on the feeding frame under the cutting plate, and each group of feeding pipes consists of The invention is composed of 3 evenly distributed feeding pipes, the position of each feeding pipe corresponds to the position of the feeding hole after the cutting disk carries the screw to rotate, and 3 supporting pipes located on the same circumference are arranged below the feeding pipe, and each feeding pipe in each group of feeding pipes is connected to a supporting pipe through a feeding hose, and a supporting device is arranged in or under the supporting pipe near the screw outlet, and each supporting pipe is fixedly connected to a cylinder frame, and upper and lower cylinders are fixedly connected to the cylinder frame, and a clamping cylinder is connected to the cylinder rod of the upper and lower cylinders, and the clamping hole of the clamping cylinder is located below the feeding pipe, and a diameter adjusting mechanism is arranged in cooperation with the feeding pipe, and the diameter adjusting mechanism includes a diameter adjusting plate, and a plurality of cam-shaped strip holes are evenly distributed on the diameter adjusting plate, and the feeding pipe is inserted in the strip hole, and the diameter adjusting plate is rotatably arranged on the diameter adjusting frame, and a rotating driving power device is connected to the diameter adjusting plate. A radial guide plate is fixedly connected to the diameter adjustment frame, a radial guide groove is provided on the radial guide plate, each supporting tube is radially slidably arranged in the guide groove or radially slidably arranged in the guide groove through a guide block, and the rotation drive device, the rotation power drive device, and each cylinder are controlled by a control system; The positioning device is composed of at least 4 sets of rough positioning mechanisms and 1 set of fine positioning mechanism distributed front and back. The rough positioning mechanism includes four rough positioning cylinders located on both sides of the chassis, two of which are in the left and right directions and two in the front and back directions. The cylinder rods of the two rough positioning cylinders in the left and right directions are connected with angle iron-shaped positioning plates, and the cylinder rod ends of the two rough positioning cylinders in the front and back directions are hinged on the driving rod. A rough positioning rod is arranged in the rough positioning mechanism, and the rear ends of the rough positioning rods are hinged on the driving rod. The rough positioning rods are rotatably arranged. In each set of rough positioning mechanisms, two angle iron-shaped positioning plates are close to the two corners of the front part of the chassis; two rough positioning rods are close to the two corners close to the rear part of the chassis; the fine positioning mechanism is cooperatively arranged at the frontmost rough positioning mechanism, including three positioning posts located on the same circle, the upper ends of the positioning posts are conical, and the three positioning posts The three precision positioning cylinders are respectively connected to the cylinder rods of the three vertical directions, and the three precision positioning cylinders are limited on the reducing mechanism. The reducing mechanism includes a reducing disk, on which three cam holes are opened, and a cylindrical plug post is provided at the lower part of the three precision positioning cylinders. Each precision positioning cylinder is inserted in the cam hole through the plug post, and a radial slider is connected to the plug post. Each radial slider is slidably set in a corresponding radial groove, and a long hole for the plug post to pass through is provided on the bottom surface of the radial groove. The bottom surface of the slider is supported on the bottom surface of the radial groove, and the three radial grooves are fixedly connected to the positioning frame. A reducing drive shaft is fixedly connected to the center of the reducing disk, and the reducing drive shaft is rotatably connected to the positioning frame. A reducing motor for driving the reducing drive shaft to rotate is arranged on the positioning frame, and the bottom of the positioning frame is rotatably connected to the base through the positioning frame shaft; the three positioning posts in the precision positioning mechanism are directly opposite to the three supporting tubes up and down; The spot welding device includes three spot welding machines, which are respectively arranged at the three sets of rough positioning devices at the back, and the three spot welding machines are connected to a corresponding three-axis system; it also includes a chassis conveying device, which includes a plate chain conveyor, and a plurality of groups of push blocks are arranged on the plate chain of the plate chain conveyor at intervals, and each group of block blocks is composed of two push blocks in the left and right directions, and the push blocks are fixedly connected to the plate chain; both sides of the plate chain conveyor are provided with fixed support plates in the length direction, and the bottom surface of the fixed support plates is not lower than the plane of the plate chain, and the chassis is supported on the fixed support plates. On the fixed support plate, when the plate chain conveyor is in motion, the push block pushes the chassis forward, and the plate chain conveyor is connected to the control system for control; the diameter adjusting frame is rotatably connected to the base through the diameter adjusting shaft, and the base is fixedly connected to the two-axis plane moving mechanism A, and a diameter adjusting frame driving motor for driving the diameter adjusting frame to rotate is arranged on the base, and the base in the precise positioning mechanism is connected to the two-axis plane moving system B, and the two-axis plane moving mechanism A and the two-axis plane moving mechanism B are both slide mechanisms driven by a screw, and a positioning frame shaft driving motor for driving the positioning frame shaft to rotate is arranged on the base.

2. The automatic spot welding system for air conditioner chassis screws according to claim 1 is characterized by: There are two groups of vibration plates, the vibration plates in the two groups are arranged alternately, there are six feeding slits, the rotation driving device is a cutting plate driving cylinder, one end of the cutting plate driving cylinder is hinged on the frame, the cylinder rod end is connected with a joint bearing, and a shaft connected to the cutting plate is passed through the joint bearing; there are two groups of feeding pipes, the upper end of the supporting pipe is provided with a Y-shaped tee, every two feeding pipes in different groups are connected to the same supporting pipe through a Y-shaped tee by a hose, the feeding slit is arc-shaped, the upper opening of the feeding pipe is a trumpet mouth with a larger upper part and a smaller lower part, and a plurality of groove wheels are installed around the cutting plate, and the cutting piece is located in the groove of the groove wheel.

3. The automatic spot welding system for air conditioner chassis screws according to claim 1 is characterized by: The rotating driving power device connected to the diameter adjusting plate is a diameter adjusting motor. A central shaft is fixedly connected to the center of the diameter adjusting plate. The diameter adjusting motor directly drives the central shaft or drives the central shaft through a transmission mechanism. The transmission mechanism includes belt drive, gear drive, and chain drive.

4. The automatic spot welding system for air conditioner chassis screws according to claim 1 is characterized by: The supporting device is a multi-petal spring sheet with a screw through hole formed in the middle. When the screw falls, the rod passes through the through hole and the head falls on the spring sheet. The supporting device is arranged in the supporting tube or is arranged in the following manner: the cylinder frame is fixedly connected to the lower end of the supporting tube, and there is a material passing hole on the cylinder frame that communicates with the supporting tube, and the supporting device is arranged in the material passing hole.

5. The automatic spot welding system for air conditioner chassis screws according to claim 1 is characterized by: The supporting device includes at least three marbles evenly distributed along the circumference, and a marble hole is opened on the hole wall through which the screw falls. The marble mouth is close to the lower end of the supporting tube. The diameter of the marble hole is smaller than the diameter of the axis of the marble along the radial direction of the marble hole. A spring is provided on the radial outer top of the marble, and the outer end of the spring is tightened by a bolt screwed into the marble hole. When the screw falls, the rod passes through the hole between the three marbles and the head falls on the marble. The marble is spherical or ellipsoidal.

6. The automatic spot welding system for air conditioner chassis screws according to claim 1 is characterized by: A material sensing photoelectric switch is installed on the frame near the end of the clamping track, and the material sensing photoelectric switch is connected to the control system. The clamping claw cylinder is provided with a magnetic switch, and the magnetic switch is connected to the control system.

7. The automatic spot welding system for air conditioner chassis screws according to claim 1 is characterized by: The feeding device also includes a feeding device, and the vibration plate feeding device includes a total vibration plate machine, which is located above each vibration plate. A hopper with three feeding holes at the bottom is arranged under the discharge channel of the total vibration plate machine. The hopper is divided into three parts by three spacers, and there is a feeding hole between every two spacers. The hopper is connected to the output of the feeding motor, and a feeding chute is arranged below the feeding hole of the hopper. A baffle is arranged between every two feeding chutes, and the baffle is located between the two feeding chutes. The baffle and the feeding chute are fixedly connected to the conversion frame, and the conversion frame is rotatably connected to an axis with the center of the hopper as the axis. A rotation driving device is connected to the conversion frame. After the rotation driving device drives the conversion frame to rotate, the outlet of the feeding chute is switched to connect with the inlet of another group of three vibration plates.

8. The automatic spot welding system for air conditioner chassis screws according to claim 1 is characterized by: The rear ends of the two coarse positioning cylinders on one side of the chassis in the coarse positioning mechanism are hinged on the frame, the rear part of the coarse positioning rod is V-shaped, the coarse positioning rod is rotatably connected to the frame, the rear ends of the two coarse positioning cylinders on the other side of the chassis are hinged on the adjustment plate, the adjustment plate is slidably connected to the frame in the left and right directions, the coarse positioning rod on this side is rotatably connected to the adjustment plate, a rack is fixedly connected to the adjustment plate, a gear is provided in conjunction with the rack, and the gear is connected to the output shaft of the adjustment motor of the adjustment plate.

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