An automatic riveting device for inner liner panels

Abstract

The present invention relates to the technical field of refrigeration equipment processing, and specifically discloses an automatic riveting device for an inner liner enclosure, comprising a conveyor, a sheet metal grabbing and docking mechanism is arranged in the middle of the conveyor, and two groups of sheet metal riveting mechanisms are arranged at the middle position of the sheet metal grabbing and docking mechanism; the sheet metal grabbing and docking mechanism comprises a stand fixed on the rear side end of the conveyor, and two guide slots are opened on the first vertical plate on the front side of the stand, and a sliding block is arranged in the guide slot, and a rotating shaft perpendicular to the first vertical plate is rotatably arranged in the sliding block, and the front ends of the two rotating shafts are fixedly connected to a grab plate frame located above the conveyor, and a vacuum suction cup is arranged on the lower surface of the grab plate frame; the automatic riveting device for an inner liner enclosure disclosed by the present invention realizes the whole process of automatic processing of the riveting processing of the inner liner enclosure, without manual loading, which not only improves the efficiency of the riveting processing of the inner liner enclosure, but also avoids the safety hazards existing in manual loading.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration equipment processing, and specifically discloses an automatic riveting device for an inner liner enclosure. Background Art

[0002] During the processing of the inner tank of the refrigerator or freezer, a metal panel is placed on its outer surface to ensure its structural strength. The existing inner tank panel is made of two U-shaped bent sheet metals riveted together. However, due to the lack of equipment, the existing inner tank panel riveting can only be processed by semi-automatic riveting, which is not only time-consuming and labor-intensive, but also has safety hazards during the loading and unloading of sheet metal parts, which can easily scratch the operators.

[0003] For example, the invention patent with application number 2018115442987 discloses a liner riveting tool and a riveting method, the riveting tool includes a riveting mechanism, a stripping mechanism, a clamping mechanism and a frame, the riveting mechanism, the stripping mechanism and the clamping mechanism are all installed on the frame, the stripping mechanism is located below the riveting mechanism, the clamping mechanism is located above the riveting mechanism, and the stripping mechanism and the clamping mechanism are both coordinated with the riveting mechanism. The liner riveting tool disclosed in the patent requires manual labor to accurately place the two U-shaped bent sheet metals in the clamping mechanism according to the riveting requirements when riveting two U-shaped bent sheet metals into the liner enclosure. After the riveting is completed, it is necessary to remove it from the upper end, resulting in low riveting processing efficiency of the entire liner enclosure and poor safety. Based on the technical problems existing in the existing process of riveting two U-shaped bent sheet metals into an inner liner panel, the present application proposes an automatic riveting device for the inner liner panel that can automatically complete loading, precise docking and riveting, so as to improve the processing efficiency of the inner liner panel and improve the safety of the entire inner liner panel riveting process. Summary of the invention

[0004] The present invention aims to provide an automatic riveting device for an inner liner enclosure to solve the problem that in the manufacturing process of the existing inner liner enclosure, two U-shaped bent sheet metals need to be manually loaded and connected before riveting, thereby realizing efficient automation of the riveting process of the inner liner enclosure and improving the safety of the entire inner liner enclosure manufacturing process.

[0005] The present invention is achieved through the following technical solutions:

[0006] An automatic riveting device for liner panels, comprising a conveyor for conveying U-shaped sheet metal parts from left and right ends to the middle, a sheet metal grabbing and docking mechanism is arranged in the middle of the conveyor, and two sets of sheet metal riveting mechanisms located above the conveyor are arranged in the middle of the sheet metal grabbing and docking mechanism;

[0007] The sheet metal grabbing and docking mechanism includes a vertical frame fixed to the rear end of the conveyor, and two guide grooves in the shape of an inverted L are provided on the first vertical plate on the front side of the vertical frame. A sliding block is provided in the guide groove, and a rotating shaft perpendicular to the first vertical plate is rotatably provided in the sliding block. The front ends of the two rotating shafts are fixedly connected to a grab plate frame located above the conveyor, and a vacuum suction cup is provided on the lower surface of the grab plate frame. A gear is provided on the rotating shaft, and two racks are provided in a mirror-symmetrical manner on the first vertical plate, and the racks are located beside the path for the gear to move up and down and act on the gear. A second telescopic driving member is provided on the top of the vertical frame, and the lower end of the second telescopic driving member is connected to a lifting guide frame, and two oblique guide grooves are provided on the lifting guide frame in a mirror-symmetrical manner. The two oblique guide grooves are arranged in an inverted eight-shaped shape and act on the rotating shaft.

[0008] During operation of the automatic riveting device for the inner liner enclosure disclosed in the present invention, the U-shaped sheet metal parts after bending and forming are respectively moved from the left and right ends of the conveyor to the sheet metal grabbing and docking mechanism in the middle, and the opening of the U-shaped sheet metal parts is arranged upward.

[0009] When the two U-shaped sheet metal parts are moved to the middle position for positioning, the second telescopic drive part is started to push the lifting guide frame downward. At this time, the two rotating shafts can only move vertically downward under the action of the oblique guide groove and the guide groove at the same time, thereby pressing the grab plate frame onto the bottom wall of the U-shaped sheet metal part and grasping it by adsorption through the vacuum suction cup.

[0010] After grabbing, the second telescopic drive member is controlled to retract in the opposite direction, thereby moving the rotating shaft upward along the vertical section of the guide groove, and when it moves close to the top, the two rotating shafts will be synchronously rotated 90° in the opposite direction through the meshing transmission action between the gear and the rack, thereby adjusting the two U-shaped sheet metal parts that originally opened upward to a relative setting of the openings.

[0011] Then, under the action of the continued retraction of the second telescopic drive member, the horizontal section of the guide groove and the oblique guide groove can act on the rotating shaft to make the two rotating shafts move closer to each other, so that the two U-shaped sheet metal parts begin to approach each other to complete the docking, until the opening side edges of the two U-shaped sheet metal parts overlap by a certain length, and the overlapping part is located in the corresponding sheet metal riveting mechanism, and then the sheet metal riveting mechanism is started to complete the riveting of the two U-shaped sheet metal parts.

[0012] Finally, after riveting is completed, gas is filled into the vacuum suction cup to eliminate the gripping force on the U-shaped sheet metal part, and then it can be removed by a matching robot or manually.

[0013] As a further configuration of the above scheme, a limiting notch aligned with the guide notch is provided on the second vertical plate at the rear side of the stand, and the portion of the limiting notch corresponding to the rack is widened, and the rear end of the rotating shaft is fixedly connected with a square anti-rotation block that interacts with the limiting notch. The above interaction between the limiting notch and the square anti-rotation block can prevent the rotating shaft from rotating during the movement, and at the same time, due to the widened design of the portion of the limiting notch corresponding to the rack, the square anti-rotation block is not restricted by the limiting notch during the rotation of the gear with the rack.

[0014] As a further configuration of the above scheme, a roller is rotatably arranged on the rotating shaft to interact with the oblique guide slot. The design of the roller can prevent the rotating shaft from directly interacting with the oblique guide slot, thereby further preventing unnecessary rotation and wear caused by the rotating shaft interacting with the oblique guide slot.

[0015] As a further configuration of the above scheme, the width of the grab plate frame is smaller than the width of the U-shaped sheet metal, and electromagnets are provided on both sides of one of the grab plate frames or on the same side of the two grab plate frames. The above electromagnet design can cause the side edges of the two U-shaped sheet metal parts to be misaligned when the openings of the two U-shaped sheet metal parts are close to each other for docking, ensuring that the side panels of the two U-shaped sheet metal parts can be docked smoothly, and after the docking is completed, the magnetic attraction is removed to make the two fit together for riveting.

[0016] As a further configuration of the above scheme, the conveyor includes a bottom box seat, the upper surface of the bottom box seat is provided with a roller seat, a group of conveying rollers are provided at both left and right ends of the roller seat, and a driving assembly for independently driving the two groups of conveying rollers is provided on the roller seat. The design of the above conveyor can independently convey the U-shaped sheet metal placed on the top through the left and right groups of conveying rollers, so that the two U-shaped sheet metals can be smoothly transported from the left and right ends to the middle.

[0017] As a further configuration of the above scheme, a vertical partition plate is provided between the left and right groups of conveying rollers, and the left and right sides of the vertical partition plate are provided with positioning wheel groups located above the conveying rollers. The design of the vertical partition plate and the positioning wheel group can stop the U-shaped sheet metal parts conveyed from both ends at the middle position of the conveyor, so that the two U-shaped sheet metal parts are respectively aligned with the two upper grab plate frames, thereby realizing the positioning of the U-shaped sheet metal parts in the X-axis direction.

[0018] As a further configuration of the above solution, a clamping and positioning assembly for positioning the left and right U-shaped sheet metal parts in the Y-axis direction is provided at the middle position of the roller seat.

[0019] As a further configuration of the above scheme, the clamping and positioning assembly includes a vertical shaft arranged at the center of the roller seat, and two X-shaped rotating bars are rotatably connected to the vertical shaft. Waist-shaped holes are provided at both ends of the rotating bars, and a clamping block is arranged above the waist-shaped hole. The clamping block is connected to the front side or the rear side of the roller seat through a sliding rod and a spring, and the lower end of each of the clamping blocks is connected to a guide rod extending into the waist-shaped hole. A first telescopic driving member is arranged in the roller seat, and an end of the first telescopic driving member is connected to the same side end of the two rotating bars through a movable connecting rod.

[0020] The design of the above-mentioned clamping and positioning assembly can realize the approach or distance between the front and rear groups of clamping blocks simply by controlling the extension or shortening of the first telescopic drive component, thereby simultaneously realizing the front and rear clamping positioning of the U-shaped sheet metal after positioning the left and right X-axes, ensuring that the U-shaped sheet metal can also be positioned on the Y-axis before grabbing.

[0021] As a further configuration of the above scheme, two groups of sheet metal riveting mechanisms are mirror-symmetrically arranged at the upper and lower ends of the front side of the first vertical plate, and the sheet metal riveting mechanism includes a strip seat vertically arranged on the front side of the first vertical plate, a riveting bottom die is fixedly arranged at the lower end of the strip seat, a hydraulic cylinder is arranged at the upper end of the strip seat, and a pressure riveting upper die acting on the riveting bottom die is arranged at the lower end of the hydraulic cylinder. The above is one of the specific design methods of the sheet metal riveting mechanism. After the overlapping part of the side plates of the two U-shaped sheet metal parts is located between the riveting bottom die and the pressure riveting upper die, the riveting of the two U-shaped sheet metal parts can be achieved directly by the pressing action of the hydraulic cylinder, and finally a U-shaped inner liner enclosure is formed.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] The automatic riveting device for the inner liner enclosure disclosed in the present invention uses a conveyor and a sheet metal grabbing and docking mechanism to move two U-shaped sheet metal parts from the left and right ends to the middle respectively, and then they are grabbed by the sheet metal grabbing and docking mechanism, and the flipping and docking are completed in the process of moving upward after grabbing. After the docking is completed, the two are connected as a whole by the upper and lower sheet metal riveting mechanisms to form the inner liner enclosure; the entire process of the riveting processing of the inner liner enclosure is fully automated, without the need for manual loading, which not only improves the efficiency of the riveting processing of the inner liner enclosure, but also avoids the safety hazards existing in manual loading.

[0024] The sheet metal grabbing and docking mechanism in the present invention drives the lifting guide frame to move up and down through a telescopic driving member, and then through the action between the oblique guide groove on the lifting guide frame, the guide groove on the frame and the rotating shaft, the two U-shaped sheet metal parts can be moved up and down and left and right, and the rotation adjustment of the opening direction of the U-shaped sheet metal part is synchronously realized through the meshing transmission between the gear and the rack during the movement, and finally the docking and riveting of the opening ends of the two U-shaped sheet metal parts are completed; its structural design is ingenious, and multiple continuous actions in the riveting process of multiple U-shaped sheet metal parts can be completed with only one power source, which not only simplifies the structure but also reduces the manufacturing and operation costs of the entire equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the front three-dimensional structure of the present invention in the first state;

[0027] Figure 2 It is a schematic diagram of the front three-dimensional structure of the present invention in the second state;

[0028] Figure 3 It is a schematic diagram of the back three-dimensional structure of the present invention;

[0029] Figure 4 It is a three-dimensional structural schematic diagram of the conveyor in the present invention;

[0030] Figure 5 It is a schematic diagram of the three-dimensional assembly structure of the sheet metal grabbing and docking mechanism in the present invention from a first angle;

[0031] Figure 6 It is a schematic diagram of the three-dimensional assembly structure of the sheet metal grabbing and docking mechanism in the present invention from a second angle;

[0032] Figure 7 It is a schematic diagram of the three-dimensional structure of the rotating shaft, the grab plate frame, etc. in the present invention from a first angle;

[0033] Figure 8 It is a schematic diagram of the second angle three-dimensional structure of the rotating shaft, the grab plate frame, etc. in the present invention;

[0034] Fig. 9 For the present invention Figure 5 A schematic diagram of the enlarged structure at A in the middle;

[0035] Fig.10 It is a schematic diagram of the planar structure of the Y-axis clamping and positioning assembly in the present invention. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 10 , and describes the application in detail with reference to embodiments. Example 1

[0038] Embodiment 1 discloses an automatic riveting device for inner liner panels, Figures 1 to 3 The main body thereof includes a conveyor 1, a sheet metal grabbing and docking mechanism 2 and a sheet metal riveting mechanism 3. The conveyor 1 includes a bottom box seat 101, a roller seat 102 is arranged on the upper surface of the bottom box seat 101, and a group of conveying rollers 103 are arranged at the left and right ends of the roller seat 102, and then a driving component 104 for independently driving a corresponding group of conveying rollers 103 is arranged at the front side end of the roller seat 102, so that the two groups of conveying rollers 103 at the left and right ends can convey the U-shaped sheet metal 100 from the two ends to the middle position respectively.

[0039] Reference Figure 4 and attached Fig.10 A vertical partition plate 105 is arranged in the roller seat 102 between the two groups of conveying rollers 103, and then a positioning wheel group 106 located above the conveying roller 103 is arranged on the left and right sides of the vertical partition plate 105, so that the U-shaped sheet metal 100 conveyed from the left and right ends can stop moving and complete the positioning in the X-axis direction after being limited by the positioning wheel group 106.

[0040] In addition, a Y-axis clamping and positioning assembly is also provided in the roller seat 102 near the vertical partition plate 105. The specific Y-axis clamping and positioning assembly includes a vertical shaft 107 fixedly provided at the center of the bottom wall of the roller seat 102, on which two X-shaped rotating bars 108 are rotatably installed, and waist-shaped holes 1081 arranged along the length direction of the rotating bars 108 are provided at both ends. A clamping block 109 is provided just above the end of each rotating bar 108, and the clamping block 109 is connected to the front side or rear side of the roller seat 102 through a sliding rod 110 and a spring 111, and a guide rod 112 extending into the waist-shaped hole 1081 is provided on the lower surface of each clamping block 109. A first telescopic driving member 113 is provided in the roller seat 102 below the conveying roller 103, and then the movable ends of the first telescopic driving member 113 are connected to the same side ends of the two rotating bars 108 through a movable connecting rod 114. The specific first telescopic driving member 113 can be selected from one of a cylinder and an electric push rod, so that the two rotating bars 108 can rotate synchronously under the action of the extension or contraction of the first telescopic driving member 113, and then the front and rear groups of clamping blocks 109 can move synchronously toward the center through the action between the waist-shaped hole 1081 and the guide rod 112, thereby realizing the clamping and positioning of the two U-shaped sheet metal parts 100 on the Y-axis.

[0041] Reference Figures 5 to 8 The sheet metal grabbing and docking mechanism 2 includes a vertical frame 201 fixedly arranged at the rear end center of the conveyor 1, and the vertical frame 201 includes a first vertical plate 2011, a second vertical plate 2012 and connecting side plates 2013 at both ends that are arranged parallel to each other in the front and rear directions. The lower end of the connecting side plate 2013 is fixedly connected to the bottom box seat 101, and then the first vertical plate 2011 and the second vertical plate 2012 are fixedly connected between the connecting side plates 2013 at the left and right ends.

[0042] Two guide slots 2014 in the shape of an inverted "L" are formed on the first vertical plate 2011 in a mirror-symmetrical manner, and the two guide slots 2014 are symmetrically arranged with the vertical partition plate 105 as the symmetry axis. Sliding blocks 202 are arranged in both guide slots 2014, and a rotating shaft 203 perpendicular to the first vertical plate 2011 is rotatably arranged in the sliding blocks 202 through bearings. A gripping plate frame 204 that can be inserted into the U-shaped sheet metal part 100 is fixedly connected to the front end of each rotating shaft 203, and a plurality of vacuum suction cups 205 are arranged on the lower surface of the gripping plate frame 204. The suction pipeline corresponding to the vacuum suction cup 205 can extend through the hollow inner cavity of the rotating shaft 203 to the entire sheet metal grabbing and docking mechanism 2 and connect to the vacuum pump.

[0043] A gear 206 is fixedly arranged on the rotating shaft 203, and two racks 207 are mirror-symmetrically arranged on the first vertical plate 2011, and the racks 207 are vertically arranged beside the path for the gear 206 to move upward. At the same time, the number of teeth on the rack 207 is only one-fourth of the number of teeth on the gear 206, so that the gear 206 can mesh with the rack 207 during the process of the rotating shaft 203 moving upward, thereby driving the rotating shaft 203 to rotate precisely 90°.

[0044] A second telescopic driving member 208 is arranged at the top of the vertical frame 201, and then a lifting guide frame 209 connected to the lower end of the second telescopic driving member 208 is arranged between the first vertical plate 2011 and the second vertical plate 2012. Two oblique guide slots 2091 are opened at both ends of the lifting guide frame 209 in a mirror-symmetrical manner. The two oblique guide slots 2091 are arranged in an inverted eight-shaped shape, and the two rotating shafts 203 are arranged to pass through the corresponding oblique guide slots 2091. A roller 210 adapted to the oblique guide slot 2091 is rotatably arranged on each rotating shaft 203. The design of the roller 210 can prevent the rotating shaft 203 from rotating, deviating or wearing when the rotating shaft 203 directly acts on the oblique guide slot 2091.

[0045] A limiting notch 2015 aligned with each guide notch 2014 is provided on the second vertical plate 2012. The limiting notch 2015 is also designed in an inverted "L" shape, and the limiting notch 2015 is designed to be widened in a portion corresponding to the rack 207. Finally, a square anti-rotation block 211 adapted to the limiting notch 2015 is fixedly provided at the rear end of each rotating shaft 203, and the square anti-rotation block 211 can rotate freely in the widened area of ​​the limiting notch 2015. The interaction between the square anti-rotation block 211 and the limiting notch 2015 can ensure that the rotating shaft 203 can rotate freely except in the vertical area corresponding to the rack 207.

[0046] Reference Figure 5 and attached Fig. 9 The sheet metal riveting mechanism 3 is mirror-symmetrically provided with two upper and lower ones, and both are provided with the front side of the first vertical plate 2011 located directly above the vertical partition plate 105. The specific sheet metal riveting mechanism 3 includes a strip seat 301 fixedly connected to the front side of the first vertical plate 2011, and the strip seat 301 is arranged perpendicular to the first vertical plate 2011. A riveting bottom die 302 is fixedly connected to the lower end of the strip seat 301, a hydraulic cylinder 303 is installed at the upper end of the strip seat 301, and then a pressure riveting upper die 304 acting on the riveting bottom die 302 is connected to the lower end of the hydraulic cylinder 303. In addition, in order to ensure that the pressure riveting upper die 304 can accurately move downward to cooperate with the riveting bottom die 302 under the action of the hydraulic cylinder 303, a guide slide bar 305 acting on the strip seat 301 is arranged on the upper surface of the pressure riveting upper die 304.

[0047] When the automatic riveting device for the inner liner panel disclosed in this embodiment 1 is in operation, the two U-shaped sheet metal parts 100 are respectively transported and moved from the two ends of the conveyor 1 to the middle position, and then the two U-shaped sheet metal parts 100 are first positioned on the X-axis by the positioning wheel group 106 on both sides of the vertical partition plate 105, and then the two U-shaped sheet metal parts 100 are positioned on the Y-axis by the Y-axis clamping positioning assembly in the roller seat 102.

[0048] After the two U-shaped sheet metal parts 100 are positioned, the second telescopic drive member 208 in the sheet metal grabbing and docking mechanism 2 pushes the lifting guide frame 209 downward. At this time, the two rotating shafts 203 are simultaneously affected by the guide groove 2014 and the oblique guide groove 2091, so that the two rotating shafts 203 move vertically downward, thereby causing the grab plate frame 204 to move downward and press on the bottom wall of the U-shaped sheet metal part 100, and then it is adsorbed and grabbed by the vacuum suction cup 205.

[0049] After the U-shaped sheet metal 100 is grasped, the second telescopic drive member 208 is controlled to retract in the reverse direction, and the lifting guide frame 209 is pulled upward, thereby lifting the rotating shaft 203, the grab plate frame 204 and the U-shaped sheet metal 100 upward, and when the rotating shaft 203 passes through the vertical section corresponding to the rack 207, the meshing transmission between the gear and the rack can be used to make the rotating shaft 203 rotate accurately 90°, thereby rotating and adjusting the two U-shaped sheet metal parts 100 that were originally opened upward to have their opening ends facing each other.

[0050] Subsequently, as the second telescopic drive member 208 continues to pull the lifting guide frame 209 upward, the two rotating shafts 203 are brought closer to each other due to the combined action of the guide slot 2014 and the oblique guide slot 2091, thereby causing the two U-shaped sheet metal parts 100 with their openings facing each other to dock. After docking, the two U-shaped sheet metal parts 100 have a certain overlapping portion, which is located exactly in the corresponding sheet metal riveting mechanism 3.

[0051] Finally, the hydraulic cylinder 303 in the sheet metal riveting mechanism 3 is activated to push the upper riveting die 304 downward, and the overlapping parts of the two U-shaped sheet metal parts 100 are riveted together under the joint action of the upper riveting die 304 and the riveting bottom die 302. After the riveting is completed, the inner liner enclosure is obtained, and the vacuum suction cup 205 is removed from the adsorption and grasping effect on the U-shaped sheet metal part 100, and then it can be removed by a matching robot or manually. Example 2

[0052] Example 2 discloses an automatic riveting device for the inner liner panel that is optimized and improved based on the technical solution in Example 1, and the similarities between it and Example 1 will not be described again.

[0053] In the second embodiment, the width of the grab plate frame 204 is designed to be 5-10 cm smaller than the width of the U-shaped sheet metal part 100 , and electromagnets 212 are provided on both side surfaces of one of the grab plate frames 204 or on the same side surface of the two grab plate frames 204 .

[0054] When two U-shaped sheet metal parts 100 with openings facing each other are close to each other for docking, current is passed through the electromagnet 212 to generate a magnetic attraction force on the U-shaped sheet metal part 100, so that the two side surfaces of the same U-shaped sheet metal part 100 or the upper and lower different side surfaces of the two U-shaped sheet metal parts 100 are bent at a certain angle toward the grab plate frame 204, thereby ensuring that when the two U-shaped sheet metal parts 100 are close to each other for docking, a certain degree of misalignment occurs between their side edges to avoid precise alignment of the two and resulting in docking resistance. After docking is completed, the current passed through the electromagnet 212 is disconnected, and then the opposite side panels of the two U-shaped sheet metal parts 100 are pressed together, and then the sheet metal riveting mechanism 3 is used for pressure riveting connection.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic riveting device for inner liner panels, characterized in that: It includes a conveyor for conveying U-shaped sheet metal parts from left and right ends to the middle, a sheet metal grabbing and docking mechanism is arranged in the middle of the conveyor, and two sets of sheet metal riveting mechanisms located above the conveyor are arranged in the middle position of the sheet metal grabbing and docking mechanism; The sheet metal grabbing and docking mechanism includes a vertical frame fixed to the rear end of the conveyor, and two guide grooves in the shape of an inverted L are provided on the first vertical plate on the front side of the vertical frame. A sliding block is provided in the guide groove, and a rotating shaft perpendicular to the first vertical plate is rotatably provided in the sliding block. The front ends of the two rotating shafts are fixedly connected to a grab plate frame located above the conveyor, and a vacuum suction cup is provided on the lower surface of the grab plate frame. A gear is provided on the rotating shaft, and two racks are provided in a mirror-symmetrical manner on the first vertical plate, and the racks are located beside the path for the gear to move up and down and act on the gear. A second telescopic driving member is provided on the top of the vertical frame, and the lower end of the second telescopic driving member is connected to a lifting guide frame, and two oblique guide grooves are provided on the lifting guide frame in a mirror-symmetrical manner. The two oblique guide grooves are arranged in an inverted eight-shaped shape and act on the rotating shaft.

2. The automatic riveting device for the inner liner panel according to claim 1 is characterized in that: A limiting slot aligned with the guide slot is provided on the second vertical plate at the rear side of the stand, and the portion of the limiting slot corresponding to the rack is widened. A square anti-rotation block interacting with the limiting slot is fixedly connected to the rear end of the rotating shaft.

3. The automatic riveting device for the inner liner panel according to claim 2 is characterized in that: A roller which acts on the oblique guide groove is rotatably arranged on the rotating shaft.

4. The automatic riveting device for the inner liner panel according to claim 1 is characterized in that: The width of the grab plate frame is smaller than the width of the U-shaped sheet metal part, and electromagnets are arranged on both side surfaces of one of the grab plate frames or on the same side surface of the two grab plate frames.

5. The automatic riveting device for the inner liner panel according to claim 1 is characterized in that: The conveyor comprises a bottom box seat, the upper surface of which is provided with a roller seat, a group of conveying rollers are provided at both left and right ends of the roller seat, and a driving assembly for independently driving two groups of conveying rollers is provided on the roller seat.

6. The automatic riveting device for the inner liner panel according to claim 5 is characterized in that: A vertical partition plate is arranged between the left and right groups of conveying rollers, and a positioning wheel group located above the conveying rollers is arranged on both left and right sides of the vertical partition plate.

7. The automatic riveting device for the inner liner panel according to claim 5 is characterized in that: A clamping and positioning assembly for positioning the left and right U-shaped sheet metal parts in the Y-axis direction is arranged at the middle position of the roller seat.

8. The automatic riveting device for the inner liner panel according to claim 7 is characterized in that: The clamping and positioning assembly includes a vertical shaft arranged at the center of the roller seat, and two X-shaped rotating bars are rotatably connected to the vertical shaft. Waist-shaped holes are opened at both ends of the rotating bars, and a clamping block is arranged above the waist-shaped hole. The clamping block is connected to the front side or the rear side of the roller seat through a sliding rod and a spring, and the lower end of each of the clamping blocks is connected to a guide rod extending into the waist-shaped hole. A first telescopic driving member is arranged in the roller seat, and the end of the first telescopic driving member is connected to the same side end of the two rotating bars through a movable connecting rod.

9. The automatic riveting device for the inner liner panel according to claim 1, characterized in that: The two groups of sheet metal riveting mechanisms are mirror-symmetrically arranged at the upper and lower ends of the front side of the first vertical plate. The sheet metal riveting mechanism includes a strip seat vertically arranged on the front side of the first vertical plate, a riveting bottom mold is fixedly arranged at the lower end of the strip seat, a hydraulic cylinder is arranged at the upper end of the strip seat, and a pressure riveting upper mold that acts on the riveting bottom mold is arranged at the lower end of the hydraulic cylinder.

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