Automatic spot welding device and automatic production line for cold bottom coating of stainless steel pot

Abstract

The invention belongs to the field of automatic material conveying, and is an automatic spot welding device for cold-coated bottom of stainless steel pot and an automatic production line, comprising a rotary conveying device, an aluminum sheet feeding mechanism, a bottom-wrapped sheet feeding mechanism and a spot welding machine, wherein the rotary conveying device comprises a circulating track, a transfer die seat, a tooling die seat, a first shifting device and a second shifting device, wherein the circulating track is provided with two low-position sections and two high-position sections, each low-position section is provided with a transfer die seat, the first shifting device drives the transfer die seat to connect with the two high-position sections, and the second shifting device drives the tooling die seat to move toward the next section when the rotating die seat connects with the high-position section, wherein a bottom-wrapped sheet feeding mechanism and a spot welding machine are connected to one of the high-position sections, and an aluminum sheet feeding mechanism is connected at a corner position between the high-position section and the last low-position section, and the tooling die seat is connected with the aluminum sheet feeding mechanism, the bottom-wrapped sheet feeding mechanism and the spot welding machine by controlling the movement and stopping of the tooling die seat in the above sections.

Description

Technical Field

[0001] The invention belongs to the field of automatic material conveying, and in particular relates to an automatic spot welding device for cold-covered bottom of a stainless steel pot and an automatic production line. Background Art

[0002] In the manufacturing process of the bottom of a stainless steel pot, it is necessary to first place the aluminum sheet, the bottom sheet and other additional parts on the lower side of the bottom of the pot body in sequence, and then pre-fix the aluminum sheet and the bottom sheet on the lower side of the bottom of the pot body by spot welding, and then send them to the next process. However, since the existing process generally uses manual operation, the production efficiency is low. In order to improve the production efficiency, people hope to achieve automated production. However, the existing automated production requires multiple conveyor lines to realize different processes, and each conveyor line needs to be equipped with similar tooling. In addition, more robots are needed to transfer the workpieces or additional parts to the corresponding workstations, resulting in very high costs. Therefore, it is necessary to design an economical and automated solution. Summary of the invention

[0003] The purpose of the present invention is to solve the problem of realizing automatic feeding of multiple processes on the same tooling, and to provide an economical and feasible automatic spot welding device for cold bottom covering of stainless steel pots.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A stainless steel pot cold bottom automatic spot welding device comprises a rotary conveying device, an aluminum sheet feeding mechanism, a bottom sheet feeding mechanism and a spot welding machine; the rotary conveying device comprises a circulating track, a transfer die base, a tooling die base, a first shifting device and a second shifting device.

[0006] The circulating track is provided with two low-position sections and two high-position sections which are arranged alternately in height. Each low-position section is provided with a transfer mold base. The transfer mold base is provided with a transfer rail for connecting with the tracks of the two high-position sections. The transfer mold base can reciprocate along the track of the low-position section through a first shifting device to connect the two high-position sections.

[0007] The tooling mold base is provided with a slideway which cooperates with the transfer rail and the high-position section track. The second shifting device couples the tooling mold base when the transfer mold base is connected to the high-position section and drives the tooling mold base to move along the track of the high-position section toward the next section, so that the tooling mold base on the transfer mold base is transferred to the next high-position section, and the tooling mold base on the high-position section is transferred to the transfer mold base of the next low-position section, thereby realizing the cyclic transfer of the tooling mold base.

[0008] Along the circular transfer direction of the tooling die base, the bottom film feeding mechanism and the spot welding machine are connected in sequence on one of the high-position sections, and the aluminum sheet feeding mechanism is connected at the corner between the high-position section and the previous low-position section. The tooling die base can be controlled to move and stop in the above-mentioned sections through the first shifting device and the second shifting device to realize the connection between the tooling die base and the aluminum sheet feeding mechanism, the bottom film feeding mechanism and the spot welding machine.

[0009] Compared with the prior art, the present invention adopts a circulating track with alternating high and low tracks, and connects the transfer of the tooling die base between two adjacent sections by transferring the die base. By controlling the working states of the first and second shifting devices, the movement and stopping of the tooling die base on the circulating track can be controlled, so that the tooling die base is connected with the loading process, the aluminum sheet loading process, the bottom film loading process, the spot welding pre-fixing process and the unloading process, thereby reducing the loading and unloading operations of the workpiece in each intermediate process, realizing the repeated use of the tooling die base on a circulating track, completing multiple processes, effectively reducing the use of conveyor lines, tooling and robots, and reducing the occupied space. This implementation scheme is economical and efficient.

[0010] Preferably, the circulating track includes a first section, a second section, a third section and a fourth section which are connected in sequence, the first section and the third section are the low-position sections, the second section and the fourth section are the high-position sections, the corner position between the head end of the first section and the end of the fourth section is defined as a first corner connection position, the corner position between the end of the first section and the head end of the second section is defined as a second corner connection position, the corner position between the end of the second section and the head end of the third section is defined as a third corner connection position, and the corner position between the end of the third section and the head end of the fourth section is defined as a fourth corner connection position.

[0011] The second section is provided with a first process stop position connected to the second corner connection position and a second process stop position connected to the first process stop position and the third corner connection position. The aluminum sheet feeding mechanism is connected to the second corner connection position, the bottom sheet feeding mechanism is connected to the first process stop position, and the spot welding machine is connected to the second process stop position. Generally, the first corner connection position is a loading station for connecting with the feeding mechanism, and the fourth corner connection position is a unloading station. By setting the process stop position to meet the connection of the two intermediate processes, the tooling mold base can be reused on the circulating track to complete multiple processes and realize automated production.

[0012] Preferably, the second corner connection position, the first process stop position, the second process stop position and the third corner connection position constitute four equidistant workstations, the second section is allocated with tooling mold bases corresponding to the number of process stop positions, the third section, the fourth section and the first section are allocated with a total of 2 tooling mold bases, and the above-mentioned tooling mold bases are periodically transferred and switched on the circulating track.

[0013] The second shifting device on the second section is provided with three attachment devices for coupling the tooling die base, and the second shifting device can periodically transfer the tooling die base on the second corner connection position, the first process stop position, and the second process stop position to the next station in sequence through the attachment devices. The above arrangement can synchronously and sequentially transfer the tooling die base to the direction of the next station. Compared with the method of respectively setting fixed tooling die bases on the corresponding stations and transferring the workpiece and the attachment to the die base respectively, the above method omits the alignment operation between the workpiece and the die base, and simplifies the structure of the conveying mechanism, which is conducive to reducing costs.

[0014] Preferably, the second shifting device is arranged on the side of the high-position section track, and includes a second transmission rack, a second transmission gear, a second motor and a cross bar. The second transmission rack and the cross bar are arranged along the second section and the fourth section. The second transmission gear is meshed with the corresponding second transmission rack. The output end of the second motor is connected to the corresponding second transmission gear. The cross bar is fixedly connected to the second motor. The attachment device includes a cylinder, which is mounted on the cross bar. A pin is mounted on the output end of the cylinder. A pin hole is provided on the tooling die seat corresponding to the pin. The pin is inserted into the corresponding pin hole to couple the attachment device with the tooling die seat. The second shifting device has a simple structure, precise and reliable transmission, and uses a cylinder to drive the extension and retraction of the pin, thereby realizing the matching and disassembly of the pin and the pin hole, and has a fast response speed.

[0015] Preferably, the first shifting device is arranged between the transfer mold base and the low-position section where the transfer mold base is located, and includes a first transmission rack, a first transmission gear and a first motor. The first transmission rack is arranged along the first section and the third section, the first transmission gear is meshed with the first transmission rack, the first motor is fixedly connected to the transfer mold base, and its output end is connected to the first transmission gear. The first shifting device has a simple structure and accurate and reliable transmission.

[0016] Preferably, the tooling mold base includes a tooling base and a plurality of movable clamping seats, a central through tube is provided in the middle of the tooling base, a mold for installing a workpiece is provided on the upper part of the central through tube, a through hole connected to the central through tube is opened in the middle of the mold, the movable clamping seats are arranged on the tooling base around the circumference of the mold, and the movable clamping seats can be relatively clamped or loosened, and the tooling base is respectively provided with a first guide groove and a first guide rail extending along the movable direction of the movable clamping seat corresponding to each movable clamping seat, the movable clamping seat is connected to a first guide slide block corresponding to the first guide rail, and a first guide column is provided corresponding to the first guide groove, the first guide slide block is slidably matched with the corresponding first guide rail, the first guide column extends to the lower side of the tooling base through the corresponding first guide groove, the movable clamping seat can be loosened by pushing each first guide column toward the outer edge of the tooling base, and the movable clamping seat can be relatively clamped by moving the first guide column toward the middle of the tooling base.

[0017] A first pin is provided in the middle of the tooling base corresponding to each movable clamping seat, and a second pin is provided on each movable clamping seat. The first pin is connected to the second pin by an elastic member, and the elastic member drives the corresponding movable clamping seat to move toward the middle of the tooling base through the first pin, so that the movable clamping seat can clamp itself when not subjected to outward force, thereby realizing the reset function, thereby saving the power mechanism for realizing the reset function of the movable clamping seat and reducing the production cost.

[0018] Each movable clamping seat includes a seat body connected to the first guide slider and a pulley arranged at the upper end of the seat body and close to the mold side. The pulley is in rolling contact with the outer surface of the workpiece. While clamping the workpiece, the pulley can ensure that the outer surface of the workpiece will not be scratched when the workpiece and the movable clamping seat move up and down relative to each other, thereby playing a protective role.

[0019] The upper end of each movable clamp is respectively provided with a clamp and a clamp driving cylinder for driving the clamp to clamp or loosen relative to each other, which is used to clamp additional parts on the upper end surface of the workpiece, for example, clamping the aluminum sheet transferred from the aluminum sheet feeding mechanism to the tooling die base at the second corner connection position, and clamping the bottom package sheet transferred from the bottom package sheet feeding mechanism to the tooling die base at the first process stop position.

[0020] Preferably, the transfer mold base includes a transfer base and a clamp seat driving mechanism that drives the movable clamp seat, the transfer base is provided with a plurality of second guide grooves and a plurality of second guide rails arranged along the movable clamp seat's movable direction in a circumferential direction corresponding to the movable clamp seat, the clamp seat driving mechanism includes a movable push block and a driving device arranged on each second guide rail, the movable push block slidably cooperates with the second guide rail through a second guide slider, and includes a pushing portion arranged on the first guide column close to the mold side, and a driving rod arranged on the lower side of the pushing portion and extending to the lower side of the transfer base through the second guide groove, the driving device drives the driving rod to reciprocate along the second guide groove to drive the pushing portion to push the first guide column outward, or to move the first guide column toward the middle of the tooling base under the action of the elastic member, and the driving device controls the movement of the movable push block to realize the opening or resetting of the first guide column, so as to open or close the movable clamp seat, and this method has a simple structure and is easy to implement.

[0021] Preferably, the driving device is arranged on the lower side of the transfer base, and includes a movable disk, a second guide column, a push block driving cylinder, a plurality of connecting seats and a plurality of connecting rods. The second guide column is vertically arranged on the lower side of the transfer base, and the movable disk can be movably arranged on the second guide column up and down. The plurality of connecting seats are circumferentially arranged in the middle part of the movable disk. The upper end of each connecting rod is hinged to a corresponding driving rod, and the lower end is hinged to a corresponding connecting seat. The push block driving cylinder is fixedly arranged on the lower side of the movable disk, and its push rod is connected to the movable disk to drive the movable disk to move along the second guide column, thereby driving the plurality of connecting rods to open or close. When the connecting rod is opened, the movable push block pushes the first guide column outward to release the movable clamping seat. The above-mentioned setting method adopts the connecting rod drive to move away, and the movement of each movable push block can be synchronously driven by only one cylinder. This control method is low-cost and fast.

[0022] Preferably, the spot welding machine comprises a main machine, an upper electrode and a lower electrode, the upper electrode is driven to move up and down by a welding driving device, and the lower electrode is arranged on the lower side of the tooling die base and is coaxial with the central through tube.

[0023] The track of the second section corresponding to the rest position of the second process is designed as a split track, which is installed on a vertical lifting device. During operation, the workpiece is installed on the mold with its opening facing downward. When the tooling mold base reaches the rest position of the second process, the vertical lifting device drives the split track together with the tooling mold base and the workpiece to move downward, so that the top end of the lower electrode enters the central through tube and contacts the upper top surface of the workpiece through the mold.

[0024] The arrangement of the spot welding machine is compact in structure. The track of the second section corresponding to the rest position of the second process is designed to be a split track that can move up and down, thereby driving the workpiece to move up and down relative to the lower electrode to achieve spot welding. The circulating track of this arrangement is better connected and matched with the spot welding machine, thereby simplifying the structure of the spot welding machine.

[0025] The present invention also provides an automated production line using the above-mentioned stainless steel pot cold bottom automatic spot welding device, comprising:

[0026] The automatic spot welding device for cold bottom covering of stainless steel pot;

[0027] The pot body feeding mechanism is connected with the first corner connection position, and is used to convey the pot body to the first corner connection position and load it on the tooling mold base of the transfer mold base;

[0028] A material unloading mechanism is connected to the fourth corner connection position and is used for unloading the pot body on which the aluminum sheet and the bottom film have been placed;

[0029] A heating machine connected to the feeding mechanism;

[0030] A punching machine, connected to the heating machine, is used to punch the bottom sheet, the aluminum sheet and the bottom wall of the pot body together;

[0031] A discharging mechanism connected to the punching machine;

[0032] The blanking mechanism and the heating machine, and the heating machine and the punching machine are connected via a multi-axis manipulator.

[0033] Since the above-mentioned automated production line adopts the above-mentioned stainless steel pot cold bottom automatic spot welding device, it can also reduce the loading and unloading operations of the workpiece in each intermediate process while realizing automated production, and realize the repeated use of tooling and die bases on a circulating track to complete multiple processes, effectively reducing the use of conveyor lines, tooling and manipulators, and reducing the occupied space. This implementation plan is economical and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the automatic spot welding device and automated production line for cold bottom covering of stainless steel pots;

[0035] Figure 2 It is a schematic diagram of the automatic spot welding device for cold bottom covering of stainless steel pot (without the spot welding machine);

[0036] Figure 3 for Figure 2 A top view of

[0037] Figure 4 This is a schematic diagram of the automatic spot welding device for cold bottom covering of stainless steel pot (excluding the tooling die base and spot welding machine);

[0038] Figure 5 for Figure 4 A top view of

[0039] Figure 6 is a schematic diagram of a second shifting device;

[0040] Figure 7 is a schematic diagram of a transfer mold base;

[0041] Figure 8 is a schematic diagram of a transfer mold base and a first shifting device;

[0042] Fig. 9 is a schematic diagram of a transfer mold base;

[0043] Fig.10 It is a schematic diagram of the tooling die base (without the shell);

[0044] Fig.11 It is a schematic diagram of the tooling die base;

[0045] Fig.12 is a schematic diagram of a spot welding machine;

[0046] Fig.13 Schematic diagram of a spot welding machine. DETAILED DESCRIPTION

[0047] The specific implementation of the present invention is described below with reference to the accompanying drawings.

[0048] See also Figures 1 to 8 The present embodiment provides a stainless steel pot cold bottom automatic spot welding device, comprising a rotary conveying device, an aluminum sheet feeding mechanism S13, a bottom sheet feeding mechanism S14 and a spot welding machine H.

[0049] The rotary conveying device includes a circulating track L, a transfer mold base T, a tooling mold base W, a first shifting device N, and a second shifting device M. The circulating track L includes a first section L1, a second section L2, a third section L3, and a fourth section L4. The tracks of the above four sections are alternately arranged in high and low positions. In a specific embodiment, the first section L1 and the third section L3 are low-position sections (L1, L3) tracks, and the second section L2 and the fourth section L4 are high-position sections (L2, L4) tracks.

[0050] See also Figures 1 to 5 , Figure 7 , Fig.10 and Fig.11 The transfer mold base T is provided with two for loading the tooling mold base W. The transfer mold base T is respectively installed on the tracks of the two low-level sections (L1, L3). The transfer mold base T can reciprocate along the tracks of the corresponding low-level sections (L1, L3). A transfer rail T0 connected with the track of the high-level section (L2, L4) is provided on the transfer mold base T. A slideway W01 matching with the track of the high-level section (L2, L4) and the transfer rail T0 is provided on the lower side of the tooling mold base W. The first shifting device N is provided between the transfer mold base T and the low-level section (L1, L3) where the transfer mold base T is located. The first shifting device N can drive the transfer mold base T to move along the track of the section where it is located in the direction of the next section, so that the transfer rail T0 is connected with the track of the next high-level section (L2, L4).

[0051] See also Figures 1 to 6 The second shifting device M is arranged on the side of the track of the high-position section (L2, L4), and is provided with an attachment device F for coupling the tooling die base W. The second shifting device M can drive the coupled tooling die base W to move toward the next section along the track of the section where it is located, so that the tooling die base W on the transfer die base T is transferred to the next high-position section (L2, L4), and the tooling die base W on the high-position section (L2, L4) is transferred to the transfer die base T on the next low-position section (L1, L3), thereby realizing the cyclic movement of the tooling die base W.

[0052] Along the cyclic transfer direction of the tooling die base W, the bottom film feeding mechanism S14 and the spot welding machine H are connected in sequence on one of the high-position sections (L2, L4), and the aluminum sheet feeding mechanism S13 is connected at the corner between the high-position section (L2, L4) and the previous low-position section (L1, L3). The tooling die base W can be controlled to move and stop in the above-mentioned sections through the first shifting device N and the second shifting device M to realize the connection between the tooling die base W and the aluminum sheet feeding mechanism S13, the bottom film feeding mechanism S14 and the spot welding machine H.

[0053] See also Figure 3 and Figure 5 The corner between the beginning of the first section L1 and the end of the fourth section L4 is defined as the first corner connection position S1, the corner between the end of the first section L1 and the beginning of the second section L2 is defined as the second corner connection position S2, the corner between the end of the second section L2 and the beginning of the third section L3 is defined as the third corner connection position S3, and the corner between the end of the third section L3 and the beginning of the fourth section L4 is defined as the fourth corner connection position S4.

[0054] See also Figures 1 to 5 The second section L2 includes two process stop positions connecting the second corner connection position S2 and the third corner connection position S3, including a first process stop position S5 connecting the second corner connection position S2 and a second process stop position S6 connecting the first process stop position S5 and the third corner connection position S3. The aluminum sheet feeding mechanism S13 is connected to the second corner connection position S2, the bottom sheet feeding mechanism S14 is connected to the first process stop position S5, and the spot welding machine H is connected to the second process stop position S6.

[0055] Each process stop position corresponds to a corresponding intermediate process. The second shifting device M on the second section L2 is attached to and transfers the tooling die base W on the first section L1, so that the tooling die base W is sequentially transferred from the second corner connection position S2 to each process stop position and the third corner connection position S3, and is transferred to the fourth corner connection position S4 by the first shifting device N on the third section L3, and then transferred to the first corner connection position S1 by the second shifting device M on the fourth section L4. Generally, the first corner connection position S1 is a loading station for connecting with the loading mechanism, and the fourth corner connection position S4 is a unloading station. By setting the process stop position to meet the connection of the two intermediate processes, the tooling die base W is reused on the circulating track L to complete multiple processes and realize automated production.

[0056] See also Figure 3 and Figure 5In a preferred embodiment, the second corner connection position S2, the first process stop position S5, the second process stop position S6 and the third corner connection position S3 are equidistantly arranged to form four equidistant workstations, and the second section L2 is allocated with tooling mold bases W corresponding to the number of corresponding process stop positions, and the third section L3, the fourth section L4 and the first section L1 are allocated with a total of 2 tooling mold bases W, and the above-mentioned tooling mold bases W are periodically transferred and switched on the circulating track L.

[0057] See also Figure 3 , the second shifting device M on the second section L2 is provided with three attachment devices F, and the attachment devices F periodically transfer the tooling die base W on the second corner connection position S2, the first process stop position S5, and the second process stop position S6 to the next station in sequence. The above arrangement can synchronously and sequentially transfer the tooling die base W to the direction of the next station. Compared with the method of respectively setting fixed tooling die bases on the corresponding stations and transferring the workpiece and the attachment to the die base, the above method saves the alignment operation between the workpiece and the die base, and simplifies the structure of the conveying mechanism, which is conducive to reducing costs.

[0058] See also Figure 2 , Figure 4 , Figure 7 and Figure 8 In a preferred embodiment, the first shifting device N includes a first transmission rack N1, a first transmission gear N2 and a first motor N3. The first transmission rack N1 is arranged along the first section L1 and the third section L3. The first transmission gear N2 is meshed with the first transmission rack N1. The first motor N3 is fixedly connected to the transfer mold base T, and its output end is connected to the first transmission gear N2. The first shifting device N has a simple structure and accurate and reliable transmission.

[0059] See also Figure 4 , Figure 7 , Fig. 9 and Fig.11 In a preferred embodiment, a positioning device D is provided on the transfer die base T, and the positioning device D includes a positioning cylinder D1, a positioning pin D2 is installed on the push rod of the positioning cylinder D1, and a positioning part W02 is provided on the tooling die base W corresponding to the positioning pin D2. When the tooling die base W is installed on the transfer die base T, the positioning cylinder D1 pushes the positioning pin D2 into the positioning part W02 to position and lock the tooling die base W. When transferring to the next section, the positioning cylinder D1 drives the positioning pin D2 to withdraw from the positioning part W02 to unlock it.

[0060] See also Figure 2 , Fig.10 and Fig.11The tooling mold base W includes a tooling base W03 and a plurality of movable clamping seats W04. A mold W05 for mounting a workpiece is provided in the middle of the tooling base W03. The plurality of movable clamping seats W04 are circumferentially arranged on the tooling base W03 around the mold W05. The movable clamping seats W04 can be relatively clamped or loosened. The tooling base W03 is respectively provided with a first guide groove W06 and a first guide rail W07 extending along the movable direction of the movable clamping seat W04 corresponding to each movable clamping seat W04. The movable clamping seat W04 corresponds to the first guide groove W06 and the first guide rail W07 extending along the movable direction of the movable clamping seat W04. A first guide slider W08 is connected to the rail W07, and a first guide column W09 is provided corresponding to the first guide groove W06. The first guide slider W08 slides with the corresponding first guide rail W07, and the first guide column W09 extends to the lower side of the tooling base W03 through the corresponding first guide groove W06. Pushing each first guide column W09 toward the outer edge of the tooling base W03 can loosen the movable clamping seat W04, and pushing the first guide column W09 toward the middle of the tooling base W03 can relatively clamp the movable clamping seat W04.

[0061] See also Figure 2 , Fig.10 and Fig.11 A first pin W10 is respectively provided in the middle of the tooling base W03 corresponding to each movable clamp seat W04, and a second pin W11 is respectively provided on each movable clamp seat W04. The first pin W10 and the second pin W11 are connected by an elastic member W12. The elastic member W12 is preferably a tension spring. The elastic member W12 drives the corresponding movable clamp seat W04 to move toward the middle of the tooling base W03 through the first pin W10, so that the movable clamp seat W04 clamps itself when no outward force is applied, thereby realizing the reset function.

[0062] See also Fig.10 The movable clamping seat W04 includes a seat body W13 connected to the first guide slider W08 and a pulley W14 arranged at the upper end of the seat body W13 close to the mold W05, and the pulley W14 is in rolling contact with the outer surface of the workpiece.

[0063] See also Fig.10 , and also includes a clamp W15 arranged at the upper end of each movable clamp seat W04, the clamp W15 is located on the upper side of the mold W05, and is used to clamp additional parts on the upper end surface of the workpiece, such as clamping the bottom sheet and the aluminum sheet when manufacturing the pot body of the composite pot bottom. Each movable clamp seat W04 is also provided with a clamp driving cylinder W16, and the clamp driving cylinder W16 drives the clamp W15 to clamp or release relatively.

[0064] See also Figure 2 and Fig.10 The tooling mold base W also includes a shell W17 that covers the upper side of the tooling base W03.

[0065] See also Figures 7 to 10 The transfer mold base T includes a transfer base T01 and a clamping base driving mechanism for driving the movable clamping base W04. The transfer base T01 is circumferentially provided with a plurality of second guide grooves T02 and a plurality of second guide rails T03 arranged along the movable direction of the movable clamping base W04 corresponding to the movable clamping base W04. The clamping base driving mechanism includes a movable push block T04 and a driving device T08 arranged on each second guide rail T03. The movable push block T04 is slidably matched with the second guide rail T03 through a second guide slider T05, and includes a pushing portion T06 arranged on the side of the first guide column W09 close to the mold W05, and a driving rod T07 arranged on the lower side of the pushing portion T06 and extending to the lower side of the transfer base T01 through the second guide groove T02.

[0066] The driving device T08 is arranged at the lower side of the transfer base T01, and includes a movable disk T09, a second guide column T10, a push block driving cylinder T11, a plurality of connecting seats T12 and a plurality of connecting rods T13. The second guide column T10 is vertically arranged at the lower side of the transfer base T01, and the movable disk T09 can be movably arranged on the second guide column T10 up and down. The plurality of connecting seats T12 are circumferentially arranged in the middle of the movable disk T09. The upper end of each connecting rod T13 is connected to the corresponding A driving rod T07 is hinged, and the lower end is hinged to a corresponding connecting seat T12. The push block driving cylinder T11 is fixed on the lower side of the movable disk T09. Its push rod is connected to the movable disk T09 to drive the movable disk T09 to move along the second guide column T10, thereby driving the multiple connecting rods T13 to open or move together. When the connecting rod T13 is opened, the movable push block T04 pushes the first guide column W09 away from the mold W05 to loosen the movable clamping seat W04.

[0067] See also Figures 1 to 11 When loading the workpiece, the transfer die base T moves to the first corner connection position S1, and the push block driving cylinder T11 drives the movable clamping seat W04 to loosen in order to load the workpiece. After the workpiece is loaded, the driving cylinder stops operating, and the elastic member W12 drives the first guide column W09 to push the movable push block T04 inward, so as to drive the movable plate T09 to press downward against the push rod of the push block driving cylinder T11 and retract it, so that the movable clamping seat W04 moves closer to clamp the workpiece. Similarly, when unloading the workpiece, the transfer die base T moves to the fourth corner connection position S4, and the driving cylinder drives the movable clamping seat W04 to loosen in order to unload the workpiece. The above-mentioned setting method of the transfer die base T is combined with the arrangement method of the circulating track L, and a clamping seat driving mechanism is reasonably set thereon to connect and apply the loading and unloading mechanism of the rotary conveying device, which is suitable for various production lines and has strong practicality and high efficiency.

[0068] See also Fig.10 and Fig.11In a preferred embodiment, two first guide grooves W06 are provided opposite to each other, the first guide rail W07 is provided between the first guide grooves W06, and two first guide posts W09 of each movable clamping seat W04 are provided correspondingly; see Figure 6 and Figure 8 , two second guide grooves T02 are relatively provided, the second guide rail T03 is arranged between the second guide grooves T02, and two driving rods T07 are correspondingly provided for each movable push block T04. The upper end of each connecting rod T13 is arranged between the two driving rods T07 corresponding to the movable push block T04, and is hinged to the two driving rods T07. The above-mentioned setting method can improve the smoothness and stability of the movement of the movable clamping seat W04 and the movable push block T04, and prevent them from shaking.

[0069] See also Figures 1 to 6 , Fig.10 and Fig.11 In a preferred embodiment, the second shifting device M includes a second transmission rack M01, a second transmission gear M02, a second motor M03 and a cross bar M04. The second transmission rack M01 and the cross bar M04 are arranged along the second section L2 and the fourth section L4. The second transmission gear M02 is meshed with the corresponding second transmission rack M01. The output end of the second motor M03 is connected to the corresponding second transmission gear M02. The cross bar M04 is fixedly connected to the second motor M03. The attachment device F includes an attachment cylinder F01. The attachment cylinder F01 is installed on the cross bar M04 at intervals. A pin rod F02 is installed at the output end of the attachment cylinder F01. A pin hole W18 is provided on the tooling die base W corresponding to the pin rod F02. The pin rod F02 is inserted into the corresponding pin hole W18 to couple the attachment device F with the tooling die base W. The second displacement device M has a simple structure, accurate and reliable transmission, and utilizes the attached cylinder F01 to drive the extension and retraction of the pin rod F02, thereby realizing the matching and disassembly of the pin rod F02 and the pin hole W18, and has a fast response speed.

[0070] See also Figure 4 and Figure 5 In a preferred embodiment, the second section L2 is provided with a limit device C corresponding to each process stop position, and the limit device C limits the tooling die base W when the tooling die base W reaches the corresponding process stop position until the limit is released when the next transfer is performed. The setting of the limit device C can prevent the tooling die base W from moving during the corresponding process and affecting the progress of the process.

[0071] See also Figure 4 , Figure 5 , Fig.11The limit device C includes a limit cylinder C01, and a limit pin C02 is installed on the push rod of the limit cylinder C01. When the tooling die holder W reaches the corresponding process stop position, the limit cylinder C01 pushes the limit pin C02 into the limit part W20 to limit and lock the tooling die holder W. During the next transfer, the limit cylinder C01 drives the limit pin C02 to withdraw from the limit part W20 to unlock. The setting method of the above-mentioned limit device C is simple in structure and fast in response speed, and can act quickly when receiving the locking and unlocking instructions. As a preferred embodiment, the positioning part W02 is the limit part W20.

[0072] See also Figure 5 , Fig.12 and Fig.13 The track of the second section L2 corresponding to the second process rest position S6 is designed as a split track L21, and the split track L21 is installed on a vertical lifting device Z. When the tooling die base W reaches the second process rest position S6, the split track L21 can be moved downward relative to the lower electrode H2 of the spot welding machine H through the vertical lifting device Z, so that the workpiece on the tooling die base W moves downward to contact the lower electrode H2 of the spot welding machine H to achieve spot welding. After the spot welding is completed, the split track L21 is moved upward relative to the lower electrode H2 of the spot welding machine H through the vertical lifting device Z to combine with the second section L2.

[0073] See also Fig.10 , Fig.12 and Fig.13 Specifically, the spot welding machine H includes a main unit H3, an upper electrode H1 and a lower electrode H2. The upper electrode H1 is driven to move up and down by a welding driving device H4. The mold W05 is installed on a tooling base W03 through a vertically arranged middle tube W21. A through hole W22 connected to the middle tube W21 is opened in the middle of the mold W05. The workpiece is sleeved on the mold W05 with its opening facing downward. The lower electrode H2 is arranged on the lower side of the tooling die base W and is coaxial with the middle tube W21. The vertical lifting device Z drives the split track L21 together with the tooling die base W and the workpiece to move downward, so that the top end of the lower electrode H2 enters the middle tube W21 and contacts the upper top surface of the workpiece through the mold W05.

[0074] See also Fig.10 , Fig.12 and Fig.13 Specifically, the vertical lifting device Z includes a connecting arm Z1, a vertical lifting component Z2 that drives the connecting arm Z1 to move up and down, the connecting arm Z1 is fixedly connected to the split track L21, the vertical lifting component Z2 can be an existing screw drive mechanism, which includes a motor, a screw, and a nut seat, the nut seat is threadedly connected to the screw, the motor screw rotates to drive the nut seat to move up and down, a slide is connected to the nut seat, and the connecting arm Z1 is fixedly connected to the slide.

[0075] See also Figure 5The limiting device C located at the second process rest position S6 is arranged on the connecting arm Z1.

[0076] Compared with the prior art, the present invention adopts a circulating track L with alternating high and low tracks, connects the tooling die base W of two adjacent sections by transferring the die base T, and controls the movement and stopping of the tooling die base W in the four sections by controlling the working states of the first and second shifting devices M, that is, preset workstations corresponding to corresponding processes on the circulating track L, and the corresponding processes can be carried out after the tooling die base W is driven to the corresponding workstations, so that the tooling die base W is connected with the loading process, the aluminum sheet loading process, the bottom film loading process, the spot welding pre-fixing process and the unloading process, thereby reducing the loading and unloading operations of the workpiece in each intermediate process, realizing the repeated use of the tooling die base W on one circulating track L, completing multiple processes, effectively reducing the use of conveyor lines, tooling and robots, and reducing the occupied space. This implementation scheme is economical and efficient.

[0077] See also Figure 1 The present invention also provides an automated production line using the above-mentioned automatic spot welding device for cold-coated bottom of stainless steel pots, which comprises the above-mentioned automatic spot welding device for cold-coated bottom of stainless steel pots, a feeding mechanism S7 on the pot body, a feeding mechanism S8, a heating machine S9, a punching machine S11 and a discharging mechanism S12, the second corner connection position S2 is connected to an aluminum sheet feeding mechanism S13, which is used to place the aluminum sheet on the pot body located at the second corner connection position S2, the first process stop position S5 is connected to a bottom sheet feeding mechanism S14, which is used to place the bottom sheet on the pot body where the aluminum sheet has been placed on the first process stop position S5, the second process stop position S6 is connected to a spot welding machine H, and the spot welding machine H is used to weld and position the bottom sheet, the aluminum sheet and the bottom wall of the pot body, and the first corner connection position S2 is connected to an aluminum sheet feeding mechanism S13, which is used to place the aluminum sheet on the pot body located at the first process stop position S5, and the second process stop position S6 is connected to a spot welding machine H, and the spot welding machine H is used to weld and position the bottom sheet, the aluminum sheet and the bottom wall of the pot body, and the first corner connection position S2 is connected to an aluminum sheet feeding mechanism S13, which is used to place the aluminum sheet on the pot body located at the first process stop position S5, and the first ... The connection position S1 is connected to the loading mechanism S7 on the pot body, which is used to transport the pot body to the first corner connection position S1 and load it on the tooling mold base W on the transfer mold base T. The loading mechanism S7 can be a conveying table. The fourth corner connection position S4 is connected to the unloading mechanism S8, which is used to unload the pot body with aluminum sheets and bottom wrapping sheets placed on it. The unloading mechanism S8 can be a multi-axis manipulator. The unloading mechanism S8 is subsequently connected to a heating machine S9 and a punching machine S11, wherein the punching machine S11 is used to punch the bottom wrapping sheet, the aluminum sheet and the bottom wall of the pot body together. The heating machine S9 and the punching machine S11 are connected by a multi-axis manipulator S10. The punching machine S11 is connected to a discharging mechanism S12, which can be a conveying table.

[0078] Since the above-mentioned automated production line adopts the above-mentioned stainless steel pot cold bottom automatic spot welding device, it can also reduce the loading and unloading operations of the workpiece in each intermediate process while realizing automated production, and realize the repeated use of the tooling die base W on a circulating track L to complete multiple processes, effectively reducing the use of conveyor lines, tooling and manipulators, and reducing the occupied space. This implementation plan is economical and feasible, and has high efficiency.

[0079] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. Automatic spot welding device for cold bottom covering of stainless steel pot, characterized in that: It includes a rotary conveying device, an aluminum sheet feeding mechanism, a bottom sheet feeding mechanism and a spot welding machine; the rotary conveying device includes a circulating track, a transfer die base, a tooling die base, a first shifting device and a second shifting device; The circulating track is provided with two low-position sections and two high-position sections which are arranged alternately in height, each low-position section is provided with the transfer mold base, and the transfer mold base is provided with a transfer rail for connecting with the tracks of the two high-position sections. The transfer mold base can reciprocate along the tracks of the low-position sections through a first shifting device to connect the two high-position sections; The tooling mold base is provided with a slideway that cooperates with the transfer rail and the high-position section track. The second shifting device couples the tooling mold base when the transfer mold base is connected to the high-position section and drives the tooling mold base to move along the track of the high-position section toward the next section, so that the tooling mold base on the transfer mold base is transferred to the next high-position section, and the tooling mold base on the high-position section is transferred to the transfer mold base of the next low-position section, thereby realizing the cyclic transfer of the tooling mold base; Along the circular transfer direction of the tooling die base, the bottom film feeding mechanism and the spot welding machine are connected in sequence on one of the high-position sections, and the aluminum sheet feeding mechanism is connected at the corner between the high-position section and the previous low-position section. The tooling die base can be controlled to move and stop in the above-mentioned sections through the first shifting device and the second shifting device to realize the connection between the tooling die base and the aluminum sheet feeding mechanism, the bottom film feeding mechanism and the spot welding machine.

2. The stainless steel pot cold bottom automatic spot welding device according to claim 1 is characterized in that: The circulating track includes a first section, a second section, a third section and a fourth section connected in sequence, the first section and the third section are the low-position sections, the second section and the fourth section are the high-position sections, the corner position between the head end of the first section and the end of the fourth section is defined as a first corner connection position, the corner position between the end of the first section and the head end of the second section is defined as a second corner connection position, the corner position between the end of the second section and the head end of the third section is defined as a third corner connection position, and the corner position between the end of the third section and the head end of the fourth section is defined as a fourth corner connection position; The second section is provided with a first process stop position connected to the second corner connection position and a second process stop position connected to the first process stop position and the third corner connection position. The aluminum sheet feeding mechanism is connected to the second corner connection position, the bottom sheet feeding mechanism is connected to the first process stop position, and the spot welding machine is connected to the second process stop position.

3. The automatic spot welding device for cold bottom covering of stainless steel pot according to claim 2 is characterized in that: The second corner connection position, the first process stop position, the second process stop position and the third corner connection position constitute four equidistant workstations. The second section is allocated with tooling die holders corresponding to the number of process stop positions. The third section, the fourth section and the first section are allocated with two tooling die holders in total. The above tooling die holders are periodically transferred and switched on the circulating track. The second shifting device on the second section is provided with three attachment devices for coupling the tooling die base, and the second shifting device can periodically transfer the tooling die base on the second corner connection position, the first process stop position, and the second process stop position to the next work station in sequence through the attachment devices.

4. The automatic spot welding device for cold bottom covering of stainless steel pot according to claim 3 is characterized in that: The second shifting device is arranged on the side of the high-position section track, and comprises a second transmission rack, a second transmission gear, a second motor and a cross bar. The second transmission rack and the cross bar are arranged along the second section and the fourth section. The second transmission gear is meshed with the corresponding second transmission rack. The output end of the second motor is connected to the corresponding second transmission gear. The cross bar is fixedly connected to the second motor. The attachment device comprises a cylinder which is mounted on a crossbar. A pin is mounted on the output end of the cylinder. A pin hole is provided on the tooling die base corresponding to the pin. The pin is inserted into the corresponding pin hole to couple the attachment device with the tooling die base.

5. The automatic spot welding device for cold bottom covering of stainless steel pot according to claim 2 is characterized in that: The first shifting device is arranged between the transfer mold base and the low-position section where the transfer mold base is located, and includes a first transmission rack, a first transmission gear and a first motor. The first transmission rack is arranged along the first section and the third section, the first transmission gear is meshed with the first transmission rack, the first motor is fixedly connected to the transfer mold base, and its output end is connected to the first transmission gear.

6. The automatic spot welding device for cold bottom coating of stainless steel pot according to claim 2 is characterized in that: The tooling mold base comprises a tooling base and a plurality of movable clamping seats, a central through tube is provided in the middle of the tooling base, a mold for installing a workpiece is provided at the upper end of the central through tube, and a through hole connected to the central through tube is opened in the middle of the mold, the movable clamping seat is arranged on the tooling base around the mold, and the movable clamping seat can be relatively clamped or loosened, the tooling base is respectively provided with a first guide groove and a first guide rail extending along the movable direction of the movable clamping seat corresponding to each movable clamping seat, the movable clamping seat is connected to a first guide slide block corresponding to the first guide rail, and a first guide column is provided corresponding to the first guide groove, the first guide slide block is slidably matched with the corresponding first guide rail, the first guide column extends to the lower side of the tooling base through the corresponding first guide groove, and the movable clamping seat can be loosened by pushing each first guide column toward the outer edge of the tooling base, and the movable clamping seat can be relatively clamped by moving the first guide column toward the middle of the tooling base; A first pin is provided in the middle of the tooling base corresponding to each movable clamp seat, and a second pin is provided on each movable clamp seat, the first pin and the second pin are connected by an elastic member, and the elastic member drives the corresponding movable clamp seat to move toward the middle of the tooling base through the first pin, so that the movable clamp seat clamps itself when no outward force is applied; Each movable clamping seat comprises a seat body connected to the first guide slider and a pulley arranged at the upper end of the seat body and close to one side of the mold, wherein the pulley is in rolling contact with the outer surface of the workpiece; The upper end of each movable clamp seat is respectively provided with a clamp and a clamp driving cylinder for driving the clamp to relatively clamp or loosen.

7. The automatic spot welding device for cold bottom coating of stainless steel pot according to claim 6 is characterized in that: The transfer mold base includes a transfer base and a clamp seat driving mechanism that drives the movable clamp seat, the transfer base is provided with a plurality of second guide grooves and a plurality of second guide rails arranged along the movable clamp seat's movable direction corresponding to the circumference of the movable clamp seat, the clamp seat driving mechanism includes a movable push block and a driving device arranged on each second guide rail, the movable push block slidably cooperates with the second guide rail through a second guide slider, and includes a pushing portion arranged on the first guide column close to the mold side, and a driving rod arranged on the lower side of the pushing portion and extending to the lower side of the transfer base through the second guide groove, the driving device drives the driving rod to reciprocate along the second guide groove to drive the pushing portion to push the first guide column outward, or to make the first guide column move toward the middle of the tooling base under the action of the elastic member.

8. The automatic spot welding device for cold bottom coating of stainless steel pot according to claim 7, characterized in that: The driving device is arranged on the lower side of the transfer base, and includes a movable disk, a second guide column, a push block driving cylinder, multiple connecting seats and multiple connecting rods. The second guide column is vertically arranged on the lower side of the transfer base, and the movable disk can be movably arranged on the second guide column up and down. The multiple connecting seats are circumferentially arranged in the middle of the movable disk. The upper end of each connecting rod is hinged to a corresponding driving rod, and the lower end is hinged to a corresponding connecting seat. The push block driving cylinder is fixedly arranged on the lower side of the movable disk, and its push rod is connected to the movable disk to drive the movable disk to move along the second guide column, thereby driving the multiple connecting rods to open or close. When the connecting rod is opened, the movable push block pushes the first guide column outward to loosen the movable clamping seat.

9. The automatic spot welding device for cold bottom covering of stainless steel pot according to claim 8, characterized in that: The spot welding machine comprises a main machine, an upper electrode and a lower electrode, wherein the upper electrode is driven by a welding driving device to move up and down, and the lower electrode is arranged at the lower side of the tooling die base and is coaxial with the central through pipe; The track of the second section corresponding to the rest position of the second process is designed as a split track, which is installed on a vertical lifting device. During operation, the workpiece is installed on the mold with its opening facing downward. When the tooling mold base reaches the rest position of the second process, the vertical lifting device drives the split track together with the tooling mold base and the workpiece to move downward, so that the top end of the lower electrode enters the central through tube and contacts the upper top surface of the workpiece through the mold.

10. An automated production line using the stainless steel pot cold bottom automatic spot welding device according to any one of claims 2 to 9, characterized in that: include: The automatic spot welding device for cold bottom covering of stainless steel pot; The pot body feeding mechanism is connected with the first corner connection position, and is used to convey the pot body to the first corner connection position and load it on the tooling mold base of the transfer mold base; A material unloading mechanism is connected to the fourth corner connection position and is used for unloading the pot body on which the aluminum sheet and the bottom film have been placed; A heating machine connected to the feeding mechanism; A punching machine, connected to the heating machine, is used to punch the bottom sheet, the aluminum sheet and the bottom wall of the pot body together; A discharging mechanism connected to the punching machine; The blanking mechanism and the heating machine, and the heating machine and the punching machine are connected via a multi-axis manipulator.

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