An automatic feeding device for projection welding of automotive nut conveying plates

Abstract

The present invention discloses an automatic loading device for convex welding of automotive nut conveying plates, which includes a trolley assembly. On one side of the trolley assembly, a storage component capable of stacking multiple workpieces in a palletizing manner is installed, and on the other side of the trolley assembly, at least one loading platform component capable of placing each workpiece individually is installed. In addition, a conveying platform component capable of individually sucking one workpiece and moving it to the loading platform component is also installed on the trolley assembly. The trolley assembly, the conveying platform component, the storage component, and the loading platform component are all electrically connected to a controller. The present invention has the advantages of being able to reduce labor costs, improve production efficiency, and reduce error rates.

Description

Technical Field

[0001] The present invention relates to the field of automotive component feeding devices, and particularly to an automatic feeding device for projection welding of automotive nut conveying plates. Background Art

[0002] With the development of the automotive industry, projection welding of nut conveying plates has been increasingly applied in the manufacturing process of automotive body components. Currently, most nut conveying plates are welded using projection welders, which require manual feeding. During the welding process, workers stand beside the projection welder and need to continuously feed the materials, resulting in high labor intensity, easy fatigue and errors, and certain potential safety hazards. In addition, even in some highly automated factories, robots are used to grasp workpieces to the projection welding station. However, the grasping accuracy of existing robots is relatively low, and it is still necessary to manually separate and orderly arrange the stacked nut conveying plates one by one to prevent the number of nut conveying plates grasped by the robot each time from exceeding one, resulting in high labor costs and low production efficiency.

[0003] How to solve the above problems has become an urgent technical issue to be addressed. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic feeding device for projection welding of automotive nut conveying plates that can reduce labor costs, improve production efficiency, and reduce error rates.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An automatic feeding device for projection welding of automotive nut conveying plates provided by the present invention includes a trolley assembly. On one side of the trolley assembly, a storage assembly capable of stacking multiple workpieces in a palletizing manner is installed, and on the other side of the trolley assembly, at least one feeding platform assembly capable of placing each workpiece separately is installed. In addition, a conveying platform assembly capable of individually sucking one workpiece and moving it to the feeding platform assembly is also installed on the trolley assembly. The trolley assembly, the conveying platform assembly, the storage assembly, and the feeding platform assembly are all electrically connected to a controller.

[0007] Furthermore, the conveying platform assembly includes fixed frames symmetrically installed on both sides of the top of the trolley assembly. Slide rails extending along the length direction of the trolley assembly are installed on both of the fixed frames. The two ends of each slide rail are respectively located above the material storage assembly and the feeding platform assembly, and two mutually parallel sliding plates are slidably installed between the two slide rails. At least one lifting cylinder is installed on the sliding plate. The output end of the lifting cylinder is connected to a floating plate through a floating joint to form a structure for driving the floating plate to vertically lift. Both ends of the floating plate are slidably connected to floating rods. The lower ends of both floating rods are connected to a connecting plate, and compression springs are sleeved outside both floating rods. Wherein, both ends of the compression spring are respectively connected to the floating plate and the connecting plate. An electromagnet is installed at the bottom of the connecting plate. And, a first slide cylinder is installed on one of the fixed frames. The output end of the first slide cylinder is connected to the sliding plate to form a structure for pushing the sliding plate to horizontally slide along the slide rail. The first slide cylinder, the lifting cylinder, and the electromagnet are all electrically connected to the controller.

[0008] Furthermore, the lifting cylinder is erected on the sliding plate through a cylinder mounting plate. First linear bearings are symmetrically installed at both ends of the cylinder mounting plate. A first guide shaft is slidably sleeved in the first linear bearing. The lower end of the first guide shaft passes through the cylinder mounting plate and is connected to the floating plate. And, at least one second linear bearing is installed at both ends of the floating plate. A second guide shaft is slidably sleeved in the second linear bearing. The lower end of the second guide shaft passes through the floating plate and is connected to the connecting plate.

[0009] Furthermore, the first slide cylinder is installed on one of the fixed frames through a slide mounting block. A slide protection cover for covering the first slide cylinder is installed on the slide mounting block. Slide rail protection covers and a first drag chain mounting plate are respectively installed on both sides of the other fixed frame. A first drag chain is installed on the first drag chain mounting plate. Both ends of the first drag chain are respectively connected to the first drag chain mounting plate and the sliding plate.

[0010] Furthermore, the conveying platform assembly further includes a first sensor and a first limit block. Wherein, the first sensor is installed on one of the connecting plates. The first limit block is installed at the end of the sliding plate close to the first slide cylinder. And, second limit blocks are installed at both ends of the fixed frame. A first position sensor for sensing the first limit block is installed on each second limit block. The first sensor and each first position sensor are all electrically connected to the controller.

[0011] Further, the material storage assembly includes two slide rail columns and a sliding block that extend along the length direction of the trolley assembly. Among them, the two slide rail columns are parallelly installed on the top surface of the trolley assembly, and slide block rails are installed at the tops of the two slide rail columns. The two ends of the sliding block are respectively in sliding fit with the two slide block rails, and the sliding block is connected to the output end of a second slide table cylinder. The second slide table cylinder is located between the two slide rail columns and is installed on the top of the trolley assembly through a cylinder mounting block. The second slide table cylinder is electrically connected to the controller. In addition, at least one first support block for stacking multiple workpieces is installed on the sliding block, and a first magnet is installed on the first support block.

[0012] Further, the material storage assembly further includes a buffer, a second position sensor, a third sensor, and several first guide columns. Among them, the buffer is installed between the two slide rail columns away from the feeding platform assembly end through a connecting block. The second position sensor is installed on the cylinder mounting block through a sensor connecting bracket. The third sensor and each first guide column are installed on the sliding block, and a second sensor is installed on one of the first guide columns. In addition, the second position sensor, the third sensor, and the second sensor are all electrically connected to the controller.

[0013] Further, slide rail guards are installed on both of the two slide rail columns. And, a second drag chain mounting plate is installed on the side surface of one of the slide rail columns, and a second drag chain is installed on the second drag chain mounting plate. The two ends of the second drag chain are respectively connected to the second drag chain mounting plate and the sliding block.

[0014] Further, the trolley assembly includes a mobile trolley body with casters. The conveying platform assembly, the material storage assembly, and the feeding platform assembly are all installed on the top of the mobile trolley body. Guide plates are symmetrically installed on both sides of the mobile trolley body, and a positioning and clamping mechanism is installed at one end of the mobile trolley body. In addition, an air-electricity docking mechanism is also installed on the mobile trolley body. The air-electricity docking mechanism is electrically connected to a solenoid valve mechanism, and the solenoid valve mechanism is electrically connected to the controller.

[0015] Further, the feeding platform assembly includes a feeding column. The feeding column is installed on the mobile trolley body, and several second support blocks for separately placing one workpiece are linearly arranged at the top of the feeding column. Second magnets are installed in each of the second support blocks. In addition, several fourth sensors, several second guide columns for positioning, and positioning pins are also installed at the top of the feeding column. Each of the fourth sensors is electrically connected to the controller.

[0016] Due to the adoption of the above structure, the beneficial effects of the present invention are as follows:

[0017] In the present invention, by providing a storage component, during use, multiple workpieces are stacked and placed on the storage component in a palletizing manner. After the conveying platform component sucks one workpiece under the control of a controller, the sucked workpiece is moved and placed on the loading platform component, so that the multiple stacked workpieces can be separated into individual workpieces for separate placement, which is convenient for a robot to grasp. Therefore, the present invention can reduce labor costs, improve production efficiency, and reduce error rates.

[0018] Through the following description and in conjunction with the accompanying drawings, the present invention will become clearer, and these drawings are used to explain the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a schematic diagram of the structure of the trolley component of the present invention;

[0022] Figure 3 is a schematic diagram of the structure of the conveying platform component of the present invention;

[0023] Figure 4 is a schematic diagram of the structure of the storage component of the present invention;

[0024] Figure 5 is a schematic diagram of the structure of the loading platform component of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0026] Please refer to Figures 1 to 5, an automatic feeding device for projection welding of automotive nut conveying plates provided by the present invention includes a trolley assembly 100. A storage component 300 capable of stacking multiple workpieces in a palletizing manner is installed on one side of the trolley assembly 100, and at least one feeding platform component 400 capable of placing each workpiece individually is installed on the other side of the trolley assembly 100. In addition, a conveying platform component 200 capable of individually sucking one workpiece and moving it to the feeding platform component 400 is also installed on the trolley assembly 100. The trolley assembly 100, the conveying platform component 200, the storage component 300, and the feeding platform component 400 are all electrically connected to a controller. During use, the controller controls the conveying platform component 200 to suck one workpiece and then move and place the sucked workpiece on the feeding platform component 400, so that the multiple workpieces stacked on the storage component 300 can be separated into independent single workpieces and placed individually on the feeding platform component 400, which is convenient for the robot to grasp. Moreover, the worker feeds materials at one end of the storage component 300 far from the feeding platform component 400, with high safety.

[0027] In the present invention, the conveying platform assembly 200 includes fixed frames 201 symmetrically installed on both sides of the top of the trolley assembly 100. Slideway rails 202 extending along the length direction of the trolley assembly 100 are installed on both of the fixed frames 201. Both ends of the slideway rails 202 are respectively located above the storage component 300 and the loading platform component 400, and a sliding flat plate 206 is slidably installed between the two slideway rails 202. At least one lifting cylinder 207 is installed on the sliding flat plate 206. The output end of the lifting cylinder 207 is connected to a floating plate 211 through a floating joint 210 to form a structure for driving the floating plate 211 to vertically lift and lower. Both ends of the floating plate 211 are slidably connected to floating rods 214. The lower ends of both of the floating rods 214 are connected to a connecting plate 216, and compression springs 215 are sleeved on the outer sides of both of the floating rods 214. Among them, both ends of the compression spring 215 are respectively connected to the floating plate 211 and the connecting plate 216, so as to be able to limit the sliding distance of the floating rod 214 and be applicable to picking workpieces of different thicknesses. An electromagnet 217 is installed at the bottom of the connecting plate 216. In addition, a first slideway cylinder 203 is installed on one of the fixed frames 201. The output end of the first slideway cylinder 203 is connected to the sliding flat plate 206 to form a structure for pushing the sliding flat plate 206 to horizontally slide along the slideway rails 202. The first slideway cylinder 203, the lifting cylinder 207, and the electromagnet 217 are all electrically connected to a controller. The first slideway cylinder 203 drives the sliding flat plate 206 to horizontally slide along the slideway rails 202, so that the lifting cylinder 207 can move back and forth above the storage component 300 and the loading platform component 400; the lifting cylinder 207 drives the connecting plate 216 to vertically lift and lower in sequence through the floating joint 210, the floating plate 211, and the floating rod 214, so that the connecting plate 216 can descend to a preset height and then suck the workpiece through the electromagnet 217.

[0028] In the present invention, the lifting cylinder 207 is erected on the sliding flat plate 206 through a cylinder mounting plate. First linear bearings 208 are symmetrically installed at both ends of the cylinder mounting plate. A first guide shaft 209 is slidably sleeved in the first linear bearings 208. The lower end of the first guide shaft 209 passes through the cylinder mounting plate and is connected to the floating plate 211, which is used to improve the stability of the floating plate 211 when it moves up and down and ensure that the floating plate 211 vertically lifts and lowers; in addition, at least one second linear bearing 212 is installed at both ends of the floating plate 211. A second guide shaft 213 is slidably sleeved in the second linear bearings 212. The lower end of the second guide shaft 213 passes through the floating plate 211 and is connected to the connecting plate 216, which is used to improve the stability of the connecting plate 216 when it moves up and down and ensure that the connecting plate 216 vertically lifts and lowers.

[0029] In the present invention, the first sliding table cylinder 203 is mounted on one of the fixed frames 201 through a sliding table mounting block 204. A sliding table protective cover 205 for covering the first sliding table cylinder 203 is mounted on the sliding table mounting block 204. Slide rail protective covers 224 and first drag chain mounting plates 223 are respectively mounted on both sides of the other fixed frame 201. A first drag chain 222 is mounted on the first drag chain mounting plate 223. Two ends of the first drag chain 222 are respectively connected to the first drag chain mounting plate 223 and the sliding flat plate 206. The sliding table protective cover 205 and the slide rail protective covers 224 respectively play a role in dust prevention and protection for the first sliding table cylinder 203 and the slide rail 202. The first drag chain 222 is used to restrain and protect each wire of the conveying platform assembly 200, avoiding entanglement of the wires and preventing the wires from being pulled and broken during the movement of the sliding flat plate 206.

[0030] In the present invention, the conveying platform assembly 200 further includes a first sensor 218 and a first limit block 219. Among them, the first sensor 218 is mounted on one of the connecting plates 216, the first limit block 219 is mounted at the end of the sliding flat plate 206 close to the first sliding table cylinder 203. In addition, second limit blocks 221 are mounted at both ends of the fixed frame 201, and a first position sensor 220 for sensing the first limit block 219 is mounted on each second limit block 221. The first sensor 218 and each first position sensor 220 are electrically connected to the controller. The first sensor 218 is used to sense whether the workpiece is grasped in place, and the first position sensor 220 is used to sense the first limit block 219 to limit and adjust the position of the sliding flat plate 206, thereby determining the position of the workpiece.

[0031] In the present invention, the storage component 300 includes two slide rail columns 301 and sliding blocks 305 extending along the length direction of the trolley component 100. Among them, the two slide rail columns 301 are parallelly mounted on the top surface of the trolley component 100, and slide block slide rails 302 are mounted on the tops of the two slide rail columns 301. Two ends of the sliding block 305 are respectively in sliding fit with the two slide block slide rails 302, and the sliding block 305 is connected to the output end of a second sliding table cylinder 303. The second sliding table cylinder 303 is located between the two slide rail columns 301 and is mounted on the top of the trolley component 100 through a cylinder mounting block 304. The above-mentioned second sliding table cylinder 303 is electrically connected to the controller. In addition, at least one first support block 312 for stacking and placing multiple workpieces is mounted on the sliding block 305, and a first magnet 311 is mounted on the first support block 312 for attracting and fixing the workpiece.

[0032] In the present invention, the storage component 300 further includes a buffer 308, a second position sensor 309, a third sensor 315, and a plurality of first guide posts 313. Among them, the buffer 308 is installed between two slide rail columns 301 away from the end of the loading platform component 400 through a connecting block 306. The second position sensor 309 is installed on the cylinder mounting block 304 through a sensor connecting bracket 307. The third sensor 315 and each first guide post 313 are installed on the sliding block 305, and a second sensor 314 is installed on one of the first guide posts 313. Moreover, the second position sensor 309, the third sensor 315, and the second sensor 314 are all electrically connected to the controller. The buffer 308 is used to buffer the impact force of the sliding block 305. The second position sensor 309 is used to sense the position of the sliding block 305. The second sensor 314 is used to sense whether the storage component 300 is full of materials. The third sensor 315 is used to sense whether the storage component 300 is out of materials. Each of the first guide posts 313 is used for guiding workpieces during manual stacking of materials.

[0033] In the present invention, slide rail guards 310 are installed on both of the slide rail columns 301 for protecting the slide block slide rail 302 and preventing dust. And, a second drag chain mounting plate 317 is installed on the side of one of the slide rail columns 301. A second drag chain 316 is installed on the second drag chain mounting plate 317. The two ends of the second drag chain 316 are respectively connected to the second drag chain mounting plate 317 and the sliding block 305, for constraining and protecting each wire of the storage component 300, avoiding entanglement of the wires and preventing the wires from being pulled and broken during the movement of the sliding block 305.

[0034] In the present invention, the trolley component 100 includes a mobile trolley main body 101 with casters. The conveying platform component 200, the storage component 300, and the loading platform component 400 are all installed on the top of the mobile trolley main body 101, which is convenient for movement. Guide plates 102 are symmetrically installed on both sides of the mobile trolley main body 101, and a positioning and clamping mechanism 105 is installed at one end of the mobile trolley main body 101. When the trolley component 100 moves to the required position, it is fixed by the guide plates 102 to prevent the mobile trolley main body 101 from moving horizontally and fixed by the positioning and clamping mechanism 105 to prevent the mobile trolley main body 101 from moving longitudinally. Moreover, an air and electricity docking mechanism 104 is also installed on the above-mentioned mobile trolley main body 101. The air and electricity docking mechanism 104 is electrically connected to a solenoid valve mechanism 103, and the solenoid valve mechanism 103 is electrically connected to the controller.

[0035] In the present invention, the loading platform assembly 400 includes a loading column 401. The loading column 401 is installed on the moving trolley body 101, and a plurality of second support blocks 403 for separately placing a workpiece are linearly arranged at the top of the loading column 401. A second magnet 404 is installed in each of the second support blocks 403 for attracting and fixing the workpiece. In addition, a plurality of fourth sensors 405, a plurality of second guide columns 402 for positioning and a positioning pin 406 are further installed at the top of the loading column 401. Each of the fourth sensors 405 is electrically connected to the controller. The fourth sensor 405 is used to sense whether there is a workpiece on the loading platform assembly 400, and the second guide column 402 and the positioning pin 406 are used for positioning and guiding when the conveying platform assembly 200 conveys the workpiece.

[0036] When the present invention is in use, the third sensor 315 senses that there is no material on the storage assembly 300 and sends a signal to the controller. The controller controls the second sliding table cylinder 303 to drive the sliding block 305 to slide along the slider rail 302 to a preset loading position at one end away from the loading platform assembly 400, so that workers can stack and place multiple workpieces on the first support block 312 in a palletizing manner. Until the second sensor 314 senses that the storage assembly 300 is full, the second sensor 314 sends a signal to the controller. The controller controls the second sliding table cylinder 303 to drive the sliding block 305 to slide along the slider rail 302 to a preset workpiece taking position at one end close to the loading platform assembly 400. Then the controller controls the output end of the lifting cylinder 207 to extend downward, so that the connecting plate 216 descends to a preset height and then sucks the workpiece. When the connecting plate 216 sucks a workpiece through the electromagnet 217, the output end of the lifting cylinder 207 retracts. When the workpiece is lifted to a preset height, the output end of the first sliding table cylinder 203 retracts, pulling the sliding flat plate 206 to slide towards the direction close to the loading platform assembly 400, driving the workpiece to move to a preset position. Subsequently, the output end of the lifting cylinder 207 extends downward, so that the connecting plate 216 descends to a preset height and then the electromagnet 217 is powered off, and the workpiece falls on the second support block 403. Finally, the controller controls the output end of the lifting cylinder 207 to retract and rise, and controls the first sliding table cylinder 203 to push the sliding flat plate 206 to slide away from the loading platform assembly 400 until the output end of the lifting cylinder 207 moves to a preset position and then extends downward and sucks the workpiece through the electromagnet 217. By repeating the processes of moving and sucking in this way, the purpose of separating multiple stacked workpieces into individual workpieces and separately placing them on the loading platform assembly 400 for the robot to grab is achieved.

[0037] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present invention, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the protection of the technical solution of the present invention.

Claims

1. An automatic feeding device for projection welding of automotive nut conveying plates, comprising a trolley assembly (100); characterized in that: On one side of the trolley assembly (100), a storage component (300) capable of stacking multiple workpieces in a palletizing manner is installed, and on the other side of the trolley assembly (100), at least one loading platform component (400) capable of placing each workpiece individually is installed. Moreover, a conveying platform component (200) capable of individually sucking a workpiece and moving it to the loading platform component (400) is also installed on the trolley assembly (100). The trolley assembly (100), the conveying platform component (200), the storage component (300), and the loading platform component (400) are all electrically connected to a controller; The trolley assembly (100) includes a moving trolley body (101) with casters. The conveying platform component (200), the storage component (300), and the loading platform component (400) are all installed on the top of the moving trolley body (101). Guide plates (102) are symmetrically installed on both sides of the moving trolley body (101), and a positioning and clamping mechanism (105) is installed at one end of the moving trolley body (101). Moreover, an air-electric docking mechanism (104) is also installed on the moving trolley body (101). The air-electric docking mechanism (104) is electrically connected to an electromagnetic valve mechanism (103), and the electromagnetic valve mechanism (103) is electrically connected to the controller; The loading platform component (400) includes a loading column (401). The loading column (401) is installed on the moving trolley body (101), and a number of second support blocks (403) for individually placing a workpiece are linearly arranged at the top of the loading column (401). Second magnets (404) are installed in each of the second support blocks (403). Moreover, a number of fourth sensors (405), a number of second guide columns (402) for positioning, and positioning pins (406) are also installed at the top of the loading column (401). Each of the fourth sensors (405) is electrically connected to the controller.

2. The automatic feeding device for projection welding of automotive nut conveying plates according to claim 1, characterized in that: The conveying platform assembly (200) includes fixed frames (201) symmetrically installed on both sides of the top of the trolley assembly (100). Slideway rails (202) extending along the length direction of the trolley assembly (100) are installed on both of the fixed frames (201). The two ends of the slideway rails (202) are respectively located above the storage component (300) and the loading platform component (400), and a sliding flat plate (206) is slidably installed between the two slideway rails (202). At least one lifting cylinder (207) is installed on the sliding flat plate (206). The output end of the lifting cylinder (207) is connected to a floating plate (211) through a floating joint (210) to form a structure for driving the floating plate (211) to vertically lift. Both ends of the floating plate (211) are slidably connected to floating rods (214). The lower ends of the two floating rods (214) are both connected to a connecting plate (216), and compression springs (215) are sleeved outside the two floating rods (214). Wherein, the two ends of the compression spring (215) are respectively connected to the floating plate (211) and the connecting plate (216). An electromagnet (217) is installed at the bottom of the connecting plate (216). And, a first slideway cylinder (203) is installed on one of the fixed frames (201). The output end of the first slideway cylinder (203) is connected to the sliding flat plate (206) to form a structure for pushing the sliding flat plate (206) to horizontally slide along the slideway rail (202). The first slideway cylinder (203), the lifting cylinder (207), and the electromagnet (217) are all electrically connected to the controller.

3. The automatic feeding device for projection welding of automotive nut conveying plates according to claim 2, wherein: The lifting cylinder (207) is erected on the sliding flat plate (206) through a cylinder mounting plate. First linear bearings (208) are symmetrically installed at both ends of the cylinder mounting plate. A first guide shaft (209) is slidably sleeved in the first linear bearing (208). The lower end of the first guide shaft (209) passes through the cylinder mounting plate and is connected to the floating plate (211). And, at least one second linear bearing (212) is installed at both ends of the floating plate (211). A second guide shaft (213) is slidably sleeved in the second linear bearing (212). The lower end of the second guide shaft (213) passes through the floating plate (211) and is connected to the connecting plate (216).

4. The automatic feeding device for projection welding of automotive nut conveying plates according to claim 2, wherein: The first slideway cylinder (203) is installed on one of the fixed frames (201) through a slideway mounting block (204). A slideway protective cover (205) for covering the first slideway cylinder (203) is installed on the slideway mounting block (204). Slideway protective covers (224) and a first drag chain mounting plate (223) are respectively installed on both sides of the other fixed frame (201). A first drag chain (222) is installed on the first drag chain mounting plate (223). The two ends of the first drag chain (222) are respectively connected to the first drag chain mounting plate (223) and the sliding flat plate (206).

5. The automatic feeding device for projection welding of automotive nut conveying plates according to claim 2, wherein: The conveying platform assembly (200) further includes a first sensor (218) and a first limit block (219). Among them, the first sensor (218) is installed on one of the connecting plates (216), and the first limit block (219) is installed at the end of the sliding flat plate (206) close to the first sliding table cylinder (203). In addition, second limit blocks (221) are installed at both ends of the fixed frame (201), and a first position sensor (220) for sensing the first limit block (219) is installed on each second limit block (221). The first sensor (218) and each first position sensor (220) are electrically connected to the controller.

6. The automatic feeding device for projection welding of automotive nut conveying plates according to claim 1, wherein: The storage component (300) includes two slide rail columns (301) and a sliding block (305) extending along the length direction of the trolley component (100). Among them, the two slide rail columns (301) are installed in parallel on the top surface of the trolley component (100), and slide block rails (302) are installed at the tops of the two slide rail columns (301). The two ends of the sliding block (305) are respectively slidably matched with the two slide block rails (302), and the sliding block (305) is connected to the output end of a second sliding table cylinder (303). The second sliding table cylinder (303) is located between the two slide rail columns (301), and the second sliding table cylinder (303) is installed on the top of the trolley component (100) through a cylinder mounting block (304). The above-mentioned second sliding table cylinder (303) is electrically connected to the controller. In addition, at least one first support block (312) for stacking multiple workpieces is installed on the sliding block (305), and a first magnet (311) is installed on the first support block (312).

7. An automatic feeding device for convex welding of an automotive nut conveying plate according to claim 6, characterized in that: The storage component (300) further includes a buffer (308), a second position sensor (309), a third sensor (315), and several first guide columns (313). Among them, the buffer (308) is installed between the two slide rail columns (301) at the end far from the loading platform component (400) through a connecting block (306). The second position sensor (309) is installed on the cylinder mounting block (304) through a sensor connecting bracket (307). The third sensor (315) and each first guide column (313) are installed on the sliding block (305), and a second sensor (314) is installed on one of the first guide columns (313). In addition, the second position sensor (309), the third sensor (315), and the second sensor (314) are all electrically connected to the controller.

8. An automatic feeding device for projection welding of automotive nut conveying plates according to claim 6, characterized in that: Slide rail guards (310) are installed on both of the two slide rail columns (301). And a second drag chain mounting plate (317) is installed on the side surface of one of the slide rail columns (301), and a second drag chain (316) is installed on the second drag chain mounting plate (317). The two ends of the second drag chain (316) are respectively connected to the second drag chain mounting plate (317) and the sliding block (305).

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