A resistance spot welder for welding refrigerator shelves

Abstract

The application discloses a resistance spot welding machine which can be used for welding refrigerator shelves, comprising a rack, an upper welding head assembly, a lower welding head assembly and a driving device, wherein the upper welding head assembly comprises a first mounting rod, a first electrode plate and a first insulating rod arranged on the first mounting rod, the lower end of the first insulating rod is provided with a transverse groove, the first electrode plate is accommodated in the transverse groove, a first floating insulating sleeve and a first elastic member which can move up and down relative to the first insulating rod are sleeved on the first insulating rod; the lower welding head assembly comprises a second mounting rod, a second electrode plate and a second insulating rod arranged on the second mounting rod, the upper end of the second insulating rod is provided with a longitudinal groove, and the second electrode plate is accommodated in the longitudinal groove. When the spot welding machine is used for welding the intersection of two metal wires, the welding position of the two metal wires can be positioned, the size of different iron wires can be adapted, and false welding or bruising is not prone to occur.

Description

TECHNICAL FIELD

[0001] The present application relates to the welding technical field of refrigerator shelves, and particularly relates to a resistance spot welding machine for welding refrigerator shelves. BACKGROUND

[0002] A refrigerator is an electrical appliance mainly used for displaying and storing goods in a supermarket or a supermarket. In order to facilitate customers to select suitable goods, shelves for displaying and placing various goods are often arranged in the refrigerator. The shelves are generally in the form of metal baskets. When the shelves are produced, iron wires 9 are welded together to form a metal mesh, and then a metal frame is welded on the metal mesh to form a shelf.

[0003] In the prior art, an electric resistance spot welding machine is generally used to weld the iron wires 9 into a metal mesh. The ordinary electric resistance spot welding machine includes upper and lower welding heads. The lower welding head is fixed on a machine base, and the upper welding head is installed on an elastic rod. A pneumatic cylinder is arranged above the upper welding head. During welding, two iron wires 9 are arranged horizontally and vertically between the two welding heads. The upper welding head is pushed down by the pneumatic cylinder to be folded with the lower welding head, and the intersection of the two iron wires 9 is clamped, and then current is applied to the welding heads. The current flows through the workpiece to generate a resistance heat effect, so that the intersection of the iron wires 9 is fused to realize welding.

[0004] The welding method has the following problems: first, since the surfaces of the upper and lower welding heads are generally flat, the welding may be deviated due to inaccurate positioning of the intersection of the iron wires 9; second, the iron wires 9 are easy to slide under pressure, resulting in a large deviation of the actual welding position; third, the two welding heads are exposed, which is easy to cause burns or electric shock of workers; and fourth, the heights of the intersections of different iron wires 9 are inconsistent, which is easy to cause virtual welding or bruising. SUMMARY

[0005] In view of this, the present application aims to provide a resistance spot welding machine for welding refrigerator shelves to solve at least one of the above problems.

[0006] The technical scheme adopted by the present application to solve the technical problems is as follows:

[0007] A resistance spot welding machine for welding refrigerator shelves, comprising a machine frame, an upper welding head assembly, a lower welding head assembly, and a driving device capable of driving the upper welding head assembly and / or the lower welding head assembly to move up and down,

[0008] The upper welding head assembly comprises a first mounting rod, a first electrode plate and a first insulating rod arranged on the first mounting rod, the lower end of the first insulating rod is provided with a transverse groove, the first electrode plate is accommodated in the transverse groove, the lower end surface of the first electrode plate is used for pressing the wire embedded in the transverse groove, a first floating insulating sleeve capable of moving up and down relative to the first insulating rod is sleeved on the first insulating rod, the upper part of the first electrode plate extends out of the first insulating rod and is fixed in the interior of the first floating insulating sleeve, and the first floating insulating sleeve is connected with a first elastic member capable of keeping the first floating insulating sleeve at the lowest position on the first insulating rod.

[0009] The lower welding head assembly comprises a second mounting rod, a second electrode plate and a second insulating rod arranged on the second mounting rod, the upper end of the second insulating rod is provided with a longitudinal groove, the second electrode plate is accommodated in the longitudinal groove, and the upper end surface of the second electrode plate is used for pressing the wire embedded in the longitudinal groove.

[0010] In a preferred scheme of the present application, a second floating insulating sleeve capable of moving up and down relative to the second insulating rod is sleeved on the second insulating rod, the lower part of the second electrode plate extends out of the second insulating rod and is fixed in the interior of the second floating insulating sleeve, and the second floating insulating sleeve is connected with a second elastic member capable of keeping the second floating insulating sleeve at the highest position on the second insulating rod.

[0011] In a preferred scheme of the present application, a lifting seat and a lower mounting seat are further included, the driving device is used for driving the lifting seat to move up and down, the first mounting rod is mounted on the lifting seat, the second mounting rod is mounted on the lower mounting seat, the first mounting rod is a hollow pipe, the upper end of the first insulating rod is fixedly connected with a first vertical rod penetrating the inner hole of the first mounting rod, the first vertical rod can move relative to the first mounting rod under the action of an external force to switch the transverse groove of the first insulating rod to a longitudinal state, a first locking structure capable of locking the first mounting rod and the first vertical rod is arranged between the first mounting rod and the first vertical rod, the second mounting rod is a hollow pipe, the lower end of the second insulating rod is fixedly connected with a second vertical rod penetrating the inner hole of the second mounting rod, the second vertical rod can move relative to the second mounting rod under the action of an external force to switch the longitudinal groove of the second insulating rod to a transverse state, and a second locking structure capable of locking the second mounting rod and the second vertical rod is arranged between the second mounting rod and the second vertical rod.

[0012] In a preferred scheme of the present application, a plurality of positioning slots are arranged on the inner side wall of the upper port of the first mounting rod, the first vertical rod is provided with a clamping block clamped in the corresponding positioning slot, the first vertical rod can rotate relative to the first mounting rod when the first vertical rod with the clamping block is pulled out of the corresponding positioning slot, and the first locking structure comprises a first magnetic attraction member arranged on the first mounting rod and a second magnetic attraction member arranged on the first vertical rod, the first magnetic attraction member and the second magnetic attraction member attract each other to limit the clamping block from being pulled out of the corresponding positioning slot.

[0013] In a preferred scheme of the present application, all the positioning slots comprise four reference positioning slots and a plurality of special positioning slots, the four reference positioning slots are uniformly distributed along the circumference of the inner side wall of the first mounting rod, the upper end of the first mounting rod is provided with an indicator disc, the upper surface of the indicator disc is provided with a scale for indicating an angle, and the first vertical rod is sleeved with a pointer.

[0014] In a preferred scheme of the present application, the lower end of the first vertical rod is screwed with a first connecting rod, the lower end of the first connecting rod is screwed with the first insulating rod, the middle part of the first connecting rod is provided with a first limiting table, the first elastic member is a compression spring sleeved outside the first insulating rod, the upper end of the first elastic member abuts against the first limiting table, the lower end of the first elastic member abuts against the first floating insulating sleeve, the first insulating rod is provided with a first step with a stepped surface facing upward, and the inner part of the first floating insulating sleeve is provided with a limiting step abutting against the first step.

[0015] In a preferred scheme of the present application, a plurality of positioning slots are arranged on the inner side wall of the lower port of the second mounting rod, the second vertical rod is provided with a clamping block clamped in the corresponding positioning slot, the second vertical rod can rotate relative to the second mounting rod when the second vertical rod with the clamping block is pulled out of the corresponding positioning slot, and the second locking structure comprises a third magnetic attraction member arranged on the second mounting rod and a fourth magnetic attraction member arranged on the second vertical rod, the third magnetic attraction member and the fourth magnetic attraction member attract each other to limit the clamping block from being pulled out of the corresponding positioning slot.

[0016] In a preferred scheme of the present application, the positioning slots on the second mounting rod are uniformly distributed along the circumference of the inner side wall of the first mounting rod, all the positioning slots on the second mounting rod comprise four reference positioning slots and a plurality of special positioning slots, the four reference positioning slots are uniformly distributed along the circumference of the inner side wall of the first mounting rod, the number of the special positioning slots on the second mounting rod is different from that on the first mounting rod, the second vertical rod is fixedly provided with an indicator disc, the upper surface of the indicator disc is provided with a scale for indicating an angle, and the lower end of the second mounting rod is sleeved with a pointer.

[0017] In a preferred scheme of the present application, the number of special positioning grooves on the first mounting rod is 20, and the number of special positioning grooves on the second mounting rod is 32.

[0018] In a preferred scheme of the present application, the number of special positioning grooves on the first mounting rod is 8, and the number of special positioning grooves on the second mounting rod is 12.

[0019] In a preferred scheme of the present application, the number of special positioning grooves on the first mounting rod is 12, and the number of special positioning grooves on the second mounting rod is 20.

[0020] In a preferred scheme of the present application, the upper end of the second vertical rod is screwed with a second connecting rod, the upper end of the second connecting rod is screwed with the second insulating rod, the middle part of the second connecting rod is provided with a second limiting table, the second elastic member is a compression spring sleeved outside the second insulating rod, the lower end of the second elastic member abuts against the second limiting table, the upper end of the second elastic member abuts against the second floating insulating sleeve, the second insulating rod is provided with a second step with a downward step face, and the inside of the second floating insulating sleeve is provided with a limiting step abutting against the second step.

[0021] In a preferred scheme of the present application, the upper fixing device for fixing the first mounting rod is arranged on the lifting seat, the lower fixing device for fixing the second mounting rod is arranged on the lower mounting seat, the upper fixing device comprises a first clamping block, a second clamping block, and a threaded fastener connecting the first clamping block and the second clamping block, the first clamping block is fixed with the lifting seat, the first mounting rod is clamped between the first clamping block and the second clamping block, the first clamping block and the second clamping block are both provided with an upper clamping groove matched with the first mounting rod, the lower fixing device comprises a third clamping block, a fourth clamping block, and a threaded fastener connecting the third clamping block and the fourth clamping block, the third clamping block is fixed with the lower mounting seat, the second mounting rod is clamped between the third clamping block and the fourth clamping block, and the third clamping block and the fourth clamping block are both provided with a lower clamping groove matched with the second mounting rod.

[0022] The present application has the following beneficial effects: 1. The transverse grooves and the longitudinal grooves can respectively position the iron wire, so that the actual welding point position has a small deviation from the preset position; 2. The first electrode plate and the second electrode plate are both floating designs, which can adapt to the size of different iron wires and are not easy to appear virtual welding or be pressed; the floating compression spring can adapt to the wire diameter tolerance of ±0.5 mm; 3. The first insulating rod, the second insulating rod, the first floating insulating sleeve, and the second floating insulating sleeve are all insulating, and the first electrode plate and the second electrode plate are both not exposed, so that the staff will not touch the first electrode plate and the second electrode plate to cause electric shock. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1is a perspective view of the outer frame when four metal wires are welded into a shelf layer;

[0024] Figure 2 is a perspective view of embodiment 1 of the present application;

[0025] Figure 3 is Figure 2 is an enlarged view of part A in FIG. 1;

[0026] Figure 4 is a perspective view of the upper welding head assembly in embodiment 1;

[0027] Figure 5 is an exploded view of the upper welding head assembly in embodiment 1;

[0028] Figure 6 is a sectional view of the upper welding head assembly in embodiment 1;

[0029] Figure 7 is an exploded view of the first mounting rod and the first vertical rod in embodiment 1;

[0030] Figure 8 is a sectional view of the lower welding head assembly in embodiment 1;

[0031] Figure 9 is a perspective view of embodiment 2 of the present application;

[0032] Figure 10 is Figure 9 is an enlarged view of part B in FIG. 2;

[0033] Figure 11 is an exploded view of the first mounting rod and the first vertical rod in embodiment 2;

[0034] Figure 12 is an exploded view of the second mounting rod and the second vertical rod in embodiment 2. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described clearly and completely below with reference to the accompanying drawings.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly. In addition, the descriptions involving "preferred", "suboptimal" and the like in the present application are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "preferred", "suboptimal" can be explicitly or implicitly included at least one of the features.

[0037] Reference is made to Figures 1 to 12The application provides a resistance spot welding machine which can be used for welding refrigerator shelves, comprising a frame 1, a lower welding head assembly 3, an upper welding head assembly 2 and a driving device capable of driving the upper welding head assembly 2 and / or the lower welding head assembly 3 to move up and down.

[0038] Embodiment 1

[0039] Figures 1 to 8 Embodiment 1 of the application is shown, in this embodiment, the spot welding machine further comprises a lifting seat 4 and a lower mounting seat 5, and the driving device is used for driving the lifting seat 4 to move up and down.

[0040] The upper welding head assembly 2 and the lower welding head assembly 3 adopt the same structure, and the difference between the two is only the different installation positions and different orientations.

[0041] The upper welding head assembly 2 comprises a first mounting rod 21 fixedly installed on the lifting seat 4, a first electrode plate 22 and a first insulating rod 23 arranged on the first mounting rod 21, the lower end of the first insulating rod 23 is provided with a transverse groove 231, the first electrode plate 22 is accommodated in the transverse groove 231, the lower end surface of the first electrode plate 22 is used for pressing a metal wire embedded in the transverse groove 231, the distance between the lower end surface of the first electrode plate 22 and the lower end surface of the first insulating rod 23 is less than the diameter or thickness of the metal wire, a first floating insulating sleeve 24 capable of moving up and down relative to the first insulating rod 23 is sleeved on the first insulating rod 23, the upper part of the first electrode plate 22 extends outwardly from the first insulating rod 23 and is fixed in the inside of the first floating insulating sleeve 24, the first floating insulating sleeve 24 is provided with a terminal 25 electrically connected with the first electrode plate 22, which is used for supplying power to the first electrode plate 22, and the first floating insulating sleeve 24 is connected with a first elastic member 26 capable of keeping the first floating insulating sleeve 24 at the lowest position on the first insulating rod 23.

[0042] The lower welding head assembly 3 comprises a second mounting rod 31, a second electrode plate 32 and a second insulating rod 33 arranged on the second mounting rod 31, the upper end of the second insulating rod 33 is provided with a longitudinal groove 331, the second electrode plate 32 is accommodated in the longitudinal groove 331, the upper end surface of the second electrode plate 32 is used for pressing a metal wire embedded in the longitudinal groove 331. The distance between the upper end surface of the second electrode plate 32 and the upper end surface of the second insulating rod 33 is less than the diameter or thickness of the metal wire, a second floating insulating sleeve 34 capable of moving up and down relative to the second insulating rod 33 is sleeved on the second insulating rod 33, the lower part of the second electrode plate 32 extends outwardly from the second insulating rod 33 and is fixed in the inside of the second floating insulating sleeve 34, the second floating insulating sleeve 34 is provided with a terminal 25 electrically connected with the second electrode plate 32, which is used for supplying power to the second electrode plate 32, and the second floating insulating sleeve 34 is connected with a second elastic member 36 capable of keeping the second floating insulating sleeve 34 at the highest position on the second insulating rod 33.

[0043] The driving device can use a cylinder 8 as a power source, or use a servo motor as a power source, and the cylinder is the best. Taking the cylinder 8 as an example, the welding operation process of the refrigerator shelf production process in the embodiment is as follows: first, the iron wire 9 is positioned on the mold, so that the longitudinal iron wire 9 is below and the transverse iron wire 9 is above; then the mold is placed between the upper welding head assembly 2 and the lower welding head assembly 3, so that the longitudinal iron wire 9 is embedded in the longitudinal groove 331 of the second insulating rod 33 and supported by the second electrode plate 32; then the welding switch is turned on, the cylinder 8 pushes the upper welding head assembly 2 downward, and after the upper welding head assembly 2 moves a certain stroke, the transverse iron wire 9 is embedded in the transverse groove 231 of the first insulating rod 23 and is pressed by the first electrode plate 22, and then current is applied to the two welding head assemblies, the current flows through the first electrode plate 22, the intersection of the two iron wires 9, and the second electrode plate 32, generating a resistance heat effect to fuse the intersection of the iron wires 9 and realize welding.

[0044] The advantages of this design are: first, because the transverse groove 231 and the longitudinal groove 331 can position the iron wire 9 respectively, the actual welding point position deviates less from the preset position; second, the first electrode plate 22 and the second electrode plate 32 are both floating designs, which can adapt to different sizes of iron wire 9 and are not easy to appear virtual welding or bruise; third, the first insulating rod 23, the second insulating rod 33, the first floating insulating sleeve 24, and the second floating insulating sleeve 34 are all insulated, and the first electrode plate 22 and the second electrode plate 32 are not exposed, so the staff will not touch the first electrode plate 22 and the second electrode plate 32 to cause electric shock.

[0045] The first insulating rod 23, the second insulating rod 33, the first floating insulating sleeve 24, and the second floating insulating sleeve 34 can be made of ceramic material or electric wood material. A small gap can be reserved between the first electrode plate 22 and the inner side wall of the transverse groove, and between the second electrode plate 32 and the inner side wall of the longitudinal groove, for compensating the different material expansion amounts of metal and insulating materials after being heated. The transverse groove and the longitudinal groove are both through grooves, which can also compensate the different material expansion amounts of metal and insulating materials after being heated to a certain extent.

[0046] When a servo motor is used as a power source, a pressure sensor can be used to measure the pressure between the second electrode plate 32 and the metal wire, and when the pressure between the second electrode plate 32 and the metal wire reaches a predetermined range, it indicates that the intersection of the two metal wires has been pressed tightly, at which time the lifting seat 4 is kept at that height position to spot weld the two metal wires, and after welding for a short time, the driving device drives the lifting seat 4 and the upper welding head assembly 2 to move upward to the initial position, and then the next welding point can be welded.

[0047] As a further improvement of the embodiment, the first mounting rod 21 is hollow tubular, the upper end of the first insulating rod 23 is fixedly connected with a first vertical rod 27 penetrating the inner hole of the first mounting rod 21, the first vertical rod 27 can move relative to the first mounting rod 21 under the action of an external force to switch the transverse groove 231 of the first insulating rod 23 to a longitudinal state, and a first locking structure capable of locking the first mounting rod 21 and the first vertical rod 27 is arranged therebetween. The second mounting rod 31 is hollow tubular, the lower end of the second insulating rod 33 is fixedly connected with a second vertical rod 37 penetrating the inner hole of the second mounting rod 31, the second vertical rod 37 can move relative to the second mounting rod 31 under the action of an external force to switch the longitudinal groove 331 of the second insulating rod 33 to a transverse state, and a second locking structure capable of locking the second mounting rod 31 and the second vertical rod 37 is arranged therebetween.

[0048] Specifically, four positioning grooves 211 are arranged on the inner side wall of the upper port of the first mounting rod 21 at intervals, and the four positioning grooves 211 are uniformly distributed along the circumference of the inner side wall of the first mounting rod 21. The first vertical rod 27 is provided with a clamping block 271 clamped in the corresponding positioning groove 211, and when the first vertical rod 27 with the clamping block 271 is pulled out of the corresponding positioning groove 211, the first vertical rod 27 can rotate relative to the first mounting rod 21. The first locking structure includes a first magnetic attraction member 61 arranged on the first mounting rod 21 and a second magnetic attraction member 62 arranged on the first vertical rod 27, and the first magnetic attraction member 61 and the second magnetic attraction member 62 attract each other to limit the clamping block 271 from being pulled out of the corresponding positioning groove 211. The lower end of the first vertical rod 27 is screwed with a first connecting rod 28, the lower end of the first connecting rod 28 is screwed with the first insulating rod 23, the middle part of the first connecting rod 28 is provided with a first limiting table 281, the first elastic member 26 is a compression spring sleeved outside the first insulating rod 23, the upper end of the first elastic member 26 abuts against the first limiting table 281, the lower end of the first elastic member 26 abuts against the first floating insulating sleeve 24, and the first insulating rod 23 is provided with a first step 232 with a step face facing upward. The inside of the first floating insulating sleeve 24 is provided with a limiting step abutting against the first step 232.

[0049] The inner side wall of the lower end of the second mounting rod 31 is provided with a plurality of positioning grooves 211, and the second vertical rod 37 is provided with a clamping block 271 clamped in the corresponding positioning groove 211. When the second vertical rod 37 is pulled out of the corresponding positioning groove 211 with the clamping block 271, the second vertical rod 37 can rotate relative to the second mounting rod 31. The second locking structure includes a third magnetic attraction member 63 provided on the second mounting rod 31 and a fourth magnetic attraction member 64 provided on the second vertical rod 37. The third magnetic attraction member 63 and the fourth magnetic attraction member 64 attract each other to limit the clamping block 271 from being pulled out of the corresponding positioning groove 211. The upper end of the second vertical rod 37 is screwed with a second connecting rod 38, the upper end of the second connecting rod 38 is screwed with the second insulating rod 33, and the middle part of the second connecting rod 38 is provided with a second limiting table 381. The second elastic member 36 is a compression spring sleeved outside the second insulating rod 33. The lower end of the second elastic member 36 abuts against the second limiting table 381, and the upper end of the second elastic member 36 abuts against the second floating insulating sleeve 34. The second insulating rod 33 is provided with a second step surface 332 facing downward, and the inside of the second floating insulating sleeve 34 is provided with a limiting step surface abutting against the second step surface 332.

[0050] Specifically, both ends of the first connecting rod 28 and both ends of the second connecting rod are screw rod parts. The lower end surface of the first vertical rod 27 is provided with a screw hole corresponding to the upper end of the first connecting rod 28, and the upper end surface of the first insulating rod 23 is provided with a screw hole corresponding to the lower end of the first connecting rod 28. The upper end surface of the second vertical rod 37 is provided with a screw hole corresponding to the lower end of the second connecting rod 38, and the lower end surface of the second insulating rod 33 is provided with a screw hole corresponding to the upper end of the second connecting rod 38.

[0051] The above design has the following advantages: when the corresponding iron wire 9 of the upper welding head assembly 2 is arranged longitudinally, the corresponding iron wire 9 of the lower welding head assembly 3 is arranged transversely, and the workpiece is not convenient to rotate by 90 degrees. We can rotate the parts used for welding on the upper welding head assembly 2 and the lower welding head assembly 3 by 90 degrees respectively, so that the transverse groove 231 on the upper welding head assembly 2 is switched to a longitudinal state, and the longitudinal groove 331 on the lower welding head assembly 3 is switched to a transverse state. Taking the upper welding head assembly 2 as an example, the adjusting method is as follows: the worker overcomes the magnetic attraction force, pulls the first vertical rod 27 upward, so that the clamping block 271 on the first vertical rod 27 is pulled out of the corresponding positioning groove 211, then rotates the first vertical rod 27 by 90 degrees, that is, rotates the first insulating rod 23 and the first electrode plate 22 by 90 degrees together, and finally inserts the first vertical rod 27 downward, so that the positioning groove 211 is inserted into another positioning groove 211. The lower welding head assembly 3 has the same structure as the upper welding head assembly 2, and the adjusting method is basically the same.

[0052] In order to facilitate the pulling of the first vertical rod 27 and the second vertical rod 37, the upper end of the first vertical rod 27 and the lower end of the second vertical rod 37 are provided with a spherical handle 100.

[0053] The specific mounting structure of the upper welding head assembly 2 and the lower welding head assembly 3 in the embodiment is as follows: the upper fixing device for fixing the first mounting rod 21 is arranged on the lifting seat 4, and the lower fixing device for fixing the second mounting rod 31 is arranged on the lower mounting seat 5. The upper fixing device comprises a first clamping block 41, a second clamping block 42, and a threaded fastener connecting the first clamping block 41 and the second clamping block 42, which is a screw, a bolt or the like, the first clamping block 41 is fixed with the lifting seat 4, the first mounting rod 21 is clamped between the first clamping block 41 and the second clamping block 42, and the first clamping block 41 and the second clamping block 42 are both provided with an upper clamping groove matched with the first mounting rod 21. The lower fixing device comprises a third clamping block 51, a fourth clamping block 52, and a threaded fastener connecting the third clamping block 51 and the fourth clamping block 52, which is a screw, a bolt or the like, the third clamping block 51 is fixed with the lower mounting seat 5, the second mounting rod 31 is clamped between the third clamping block 51 and the fourth clamping block 52, and the third clamping block 51 and the fourth clamping block 52 are both provided with a lower clamping groove matched with the second mounting rod 31. In order to position the first mounting rod 21 and the second mounting rod 31, vertical positioning grooves 211 can be arranged on the outer side walls of the first mounting rod 21 and the second mounting rod 31, and positioning protrusions corresponding to the positioning grooves 211 are arranged on the inner side walls of the upper clamping groove and the lower clamping groove.

[0054] In the embodiment, an annular table is arranged on the outer side wall of the first vertical rod 27, a magnet groove is arranged on the lower end surface of the annular table, the second magnetic attraction member 62 is a magnet arranged in the magnet groove, the upper end surface of the first mounting rod 21 is provided with a blind hole opposite to the magnet groove, and the first magnetic attraction member 61 is a magnet or an iron block arranged in the blind hole.

[0055] In addition to the magnetic attraction structure, the first locking structure and the second locking structure can also adopt other structure forms, such as screw locking and radial elastic pin locking.

[0056] Embodiment 2

[0057] Figures 9 to 12 Embodiment 2 of the application is shown, and the embodiment and embodiment 1 have similar structures, and the difference lies in that, on the basis of embodiment 1, the angle adjustment range of the transverse groove 231 and the longitudinal groove 331 is increased, the angle indicating device is increased, and the installation position of the first magnetic attraction member 61 and the second magnetic attraction member 62 is fine-tuned.

[0058] The specific differences are as follows, first, in the embodiment, all positioning grooves 211 on the first mounting rod 21 include four reference positioning grooves 2111 and twenty special positioning grooves 2112, all the positioning grooves 211 are uniformly distributed along the circumference of the inner side wall of the first mounting rod 21, the four reference positioning grooves 2111 are uniformly distributed along the circumference of the inner side wall of the first mounting rod 21, and correspond to 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively, the number of special positioning grooves 2112 in each two reference positioning grooves 2111 is five, and the special positioning grooves 2112 between the two reference positioning grooves 2111 corresponding to 0 degrees and 90 degrees correspond to 15 degrees, 30 degrees, 45 degrees, 60 degrees and 75 degrees respectively. The upper end of the first mounting rod 21 is provided with an indicator disc 701, the upper surface of the indicator disc 701 is provided with a scale for indicating the angle, and the first vertical rod 27 is provided with a pointer 702.

[0059] All the positioning grooves 211 on the second mounting rod 31 include four reference positioning grooves 2111 and thirty-two special positioning grooves 2112, all the positioning grooves 211 are uniformly distributed along the circumference of the inner side wall of the first mounting rod 21, the four reference positioning grooves 2111 are uniformly distributed along the circumference of the inner side wall of the first mounting rod 21, and correspond to 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively, the number of special positioning grooves 2112 in each two reference positioning grooves 2111 is eight, and the special positioning grooves 2112 between the two reference positioning grooves 2111 corresponding to 0 degrees and 90 degrees correspond to 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees and 80 degrees respectively. The second vertical rod 37 is fixedly provided with an indicator disc 701, the upper surface of the indicator disc 701 is provided with a scale for indicating the angle, and the lower end of the second mounting rod 31 is provided with a pointer 702.

[0060] Secondly, in the embodiment, the upper welding head assembly 2 and the lower welding head assembly 3 also have the following differences, which are also the differences between the embodiment and embodiment 1. In the upper welding head assembly 2, the outer side wall of the first vertical rod 27 is provided with an annular table, the lower end surface of the annular table is provided with a magnet slot, the second magnetic attraction piece 62 is a magnet arranged in the magnet slot, the indicator disc 701 is provided with a blind hole opposite to the magnet slot, and the first magnetic attraction piece 61 is a magnet or an iron block arranged in the blind hole. In the lower welding head assembly 3, the indicator disc 701 is provided with an annular groove, and the third magnetic attraction piece 63 is a magnet arranged in the annular groove. The lower end surface of the second vertical rod 37 is provided with a blind hole opposite to the annular groove, and the third magnetic attraction piece 63 is a magnet or an iron block arranged in the magnet slot.

[0061] Compared with the embodiment 1, the embodiment has the advantages that the embodiment can not only be applied to the perpendicular intersection of the two iron wires 9, but also can be applied to the inclined intersection of the two iron wires 9 according to the needs, and only one positioning groove 211 is arranged on the first mounting rod 21 every 15 degrees, and only one positioning groove 211 is arranged on the second mounting rod 31 every 10 degrees, so that the minimum range of the adjustment can reach 5 degrees, and the two iron wires 9 can be welded as long as the included angle of the two iron wires 9 is a multiple of 5 degrees. For example, when the included angle of the two iron wires 9 is 5 degrees, the 0 degree scale of the upper welding head assembly 2 and the lower welding head assembly 3 are aligned, when the pointer 702 on the upper welding head assembly 2 indicates the position of 15 degrees and the pointer 702 on the lower welding head assembly 3 indicates the position of 10 degrees, the included angle of the two is 5 degrees, and when the pointer 702 on the upper welding head assembly 2 indicates the position of 15 degrees and the pointer 702 on the lower welding head assembly 3 indicates the position of 50 degrees, the included angle of the two is 35 degrees. The adjustment range is large, and the application range is wide.

[0062] Embodiment 3

[0063] The embodiment and the embodiment 2 have similar structural forms, and the only difference is that the number of the special positioning grooves on the first mounting rod and the second mounting rod are different from those in the embodiment 2.

[0064] In the embodiment, the number of the special positioning grooves on the first mounting rod is 8, and the number of the special positioning grooves on the second mounting rod is 12.

[0065] That is, the total number of the positioning grooves on the first mounting rod is 12, the span of the angle between the two adjacent positioning grooves is 30 degrees, the total number of the positioning grooves on the second mounting rod is 16, the span of the angle between the two adjacent positioning grooves is 22.5 degrees, and the difference between the two angles is 7.5 degrees. When the pointer 702 on the upper welding head assembly 2 indicates the position of 30 degrees and the pointer 702 on the lower welding head assembly 3 indicates the position of 22.5 degrees, the included angle of the two is 7.5 degrees, so that the minimum range of the adjustment can reach 7.5 degrees, and the two iron wires 9 can be welded as long as the included angle of the two iron wires 9 is a multiple of 7.5 degrees.

[0066] Embodiment 4

[0067] The embodiment and the embodiment 2 have similar structural forms, and the only difference is that the number of the special positioning grooves on the first mounting rod and the second mounting rod are different from those in the embodiment 2.

[0068] In the embodiment, the number of the special positioning grooves on the first mounting rod is 12, and the number of the special positioning grooves on the second mounting rod is 20.

[0069] That is, the total number of positioning slots on the first mounting rod is 16, the angle span between two adjacent positioning slots is 22.5 degrees, the total number of positioning slots on the second mounting rod is 24, the angle span between two adjacent positioning slots is 15 degrees, and the angle difference between them is 7.5 degrees. When the position indicated by the pointer 702 on the upper welding head assembly 2 is 22.5 degrees and the position indicated by the pointer 702 on the lower welding head assembly 3 is 15 degrees, the included angle between them is 7.5 degrees, that is, the minimum range of adjustment reaches 7.5 degrees, and as long as the included angle between the two iron wires 9 is a multiple of 7.5 degrees, welding can be carried out.

[0070] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made under the inventive concept of the present application, or direct or indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A resistance spot welder for welding refrigerator shelves, comprising a frame (1), an upper electrode assembly (2), a lower electrode assembly (3), and a driving device capable of driving the upper electrode assembly (2) and / or the lower electrode assembly (3) to move up and down, characterized in that the upper electrode assembly (2) comprises a first mounting rod (21), a first electrode plate (22), and a first insulating rod (23) arranged on the first mounting rod (21), the lower end of the first insulating rod (23) is provided with a transverse groove (231), the first electrode plate (22) is accommodated in the transverse groove (231), the lower end surface of the first electrode plate (22) is used to press the wire embedded in the transverse groove (231), a first floating insulating sleeve (24) capable of moving up and down relative to the first insulating rod (23) is sleeved on the first insulating rod (23), the upper part of the first electrode plate (22) extends out of the first insulating rod (23) and is fixed inside the first floating insulating sleeve (24), and the first floating insulating sleeve (24) is connected with a first elastic member (26) capable of keeping the first floating insulating sleeve (24) at the lowest position on the first insulating rod (23); the lower electrode assembly (3) comprises a second mounting rod (31), a second electrode plate (32), and a second insulating rod (33) arranged on the second mounting rod (31), the upper end of the second insulating rod (33) is provided with a longitudinal groove (331), the second electrode plate (32) is accommodated in the longitudinal groove (331), and the upper end surface of the second electrode plate (32) is used to press the wire embedded in the longitudinal groove (331); the second insulating rod (33) is sleeved with a second floating insulating sleeve (34) capable of moving up and down relative to the second insulating rod (33), the lower part of the second electrode plate (32) extends out of the second insulating rod (33) and is fixed inside the second floating insulating sleeve (34), and the second floating insulating sleeve (34) is connected with a second elastic member (36) capable of keeping the second floating insulating sleeve (34) at the highest position on the second insulating rod (33). ​ 2. The resistance spot welder for welding shelves of a refrigerator according to claim 1, wherein The driving device is used for driving the lifting seat (4) to move up and down, the first mounting rod (21) is installed on the lifting seat (4), the second mounting rod (31) is installed on the lower mounting seat (5), the first mounting rod (21) is a hollow pipe, the upper end of the first insulating rod (23) is fixedly connected with the first vertical rod (27) penetrating the inner hole of the first mounting rod (21), the first vertical rod (27) can move relative to the first mounting rod (21) under the action of an external force to switch the transverse groove (231) of the first insulating rod (23) to a longitudinal state, a first locking structure capable of locking the first mounting rod (21) and the first vertical rod (27) is arranged between the first mounting rod (21) and the first vertical rod (27), the second mounting rod (31) is a hollow pipe, the lower end of the second insulating rod (33) is fixedly connected with the second vertical rod (37) penetrating the inner hole of the second mounting rod (31), the second vertical rod (37) can move relative to the second mounting rod (31) under the action of an external force to switch the longitudinal groove (331) of the second insulating rod (33) to a transverse state, a second locking structure capable of locking the second mounting rod (31) and the second vertical rod (37) is arranged between the second mounting rod (31) and the second vertical rod (37).

3. The electric resistance spot welder for welding the shelf of the refrigerator according to claim 2, wherein A plurality of positioning grooves (211) are arranged on the inner side wall of the upper end port of the first mounting rod (21) at intervals, the first vertical rod (27) is provided with a clamping block (271) clamped in the corresponding positioning groove (211), when the first vertical rod (27) with the clamping block (271) is pulled out of the corresponding positioning groove (211), the first vertical rod (27) can rotate relative to the first mounting rod (21), the first locking structure comprises a first magnetic attraction member (61) arranged on the first mounting rod (21) and a second magnetic attraction member (62) arranged on the first vertical rod (27), the first magnetic attraction member (61) and the second magnetic attraction member (62) are attracted to each other to limit the clamping block (271) from being pulled out of the corresponding positioning groove (211).

4. The electric resistance spot welder for welding the shelf of the refrigerator according to claim 3, wherein The positioning grooves (211) are uniformly distributed along the circumference of the inner side wall of the first mounting rod (21), the positioning grooves (211) on the first mounting rod (21) comprise four reference positioning grooves (2111) and a plurality of special positioning grooves (2112), the four reference positioning grooves (2111) are uniformly distributed along the circumference of the inner side wall of the first mounting rod (21), the upper end of the first mounting rod (21) is provided with an indicating disc (701), the upper surface of the indicating disc (701) is provided with a scale for indicating an angle, and the first vertical rod (27) is sleeved with a pointer (702).

5. The electric resistance spot welder for welding the shelf of the refrigerator according to claim 2, wherein The lower end of the first vertical rod (27) is screwed with a first connecting rod (28), the lower end of the first connecting rod (28) is screwed with the first insulating rod (23), the middle part of the first connecting rod (28) is provided with a first limiting table (281), the first elastic member (26) is a compression spring sleeved outside the first insulating rod (23), the upper end of the first elastic member (26) abuts against the first limiting table (281), the lower end of the first elastic member (26) abuts against the first floating insulating sleeve (24), the first insulating rod (23) is provided with a first step (232) with a step face upward, and the inside of the first floating insulating sleeve (24) is provided with a limiting step abutting against the first step (232).

6. The electric resistance spot welder for welding shelves of a refrigerator according to claim 4, wherein The inner side wall of the lower end of the second mounting rod (31) is provided with a plurality of positioning grooves (211) at intervals, the second vertical rod (37) is provided with a clamping block (271) clamped in the corresponding positioning groove (211), when the second vertical rod (37) with the clamping block (271) is pulled out of the corresponding positioning groove (211), the second vertical rod (37) can rotate relative to the second mounting rod (31), the second locking structure includes a third magnetic attraction member (63) provided on the second mounting rod (31) and a fourth magnetic attraction member (64) provided on the second vertical rod (37), the third magnetic attraction member (63) and the fourth magnetic attraction member (64) attract each other to limit the clamping block (271) from being pulled out of the corresponding positioning groove (211).

7. The electric resistance spot welder for welding shelves of a refrigerator according to claim 6, wherein The positioning grooves (211) on the second mounting rod (31) are uniformly distributed along the circumference of the inner side wall of the first mounting rod (21), all the positioning grooves (211) on the second mounting rod (31) include four reference positioning grooves (2111) and a plurality of special positioning grooves (2112), the four reference positioning grooves (2111) are uniformly distributed along the circumference of the inner side wall of the first mounting rod (21), the number of the special positioning grooves (2112) on the second mounting rod (31) is different from the number of the special positioning grooves (2112) on the first mounting rod (21), the second vertical rod (37) is fixedly provided with an indicating disc (701), the upper surface of the indicating disc (701) is provided with a scale for indicating an angle, and the lower end of the second mounting rod (31) is sleeved with a pointer (702).

8. The electric resistance spot welder for welding shelves of a refrigerator according to claim 7, wherein The number of the special positioning grooves on the first mounting rod is 20, and the number of the special positioning grooves on the second mounting rod is 32; Or the number of the special positioning grooves on the first mounting rod is 8, and the number of the special positioning grooves on the second mounting rod is 12; Or the number of the special positioning grooves on the first mounting rod is 12, and the number of the special positioning grooves on the second mounting rod is 20.

9. The electric resistance spot welder for welding shelves of a refrigerator according to claim 6, wherein The upper end of the second vertical rod (37) is screwed with a second connecting rod (38), the upper end of the second connecting rod (38) is screwed with the second insulating rod (33), the middle part of the second connecting rod (38) is provided with a second limiting table (381), the second elastic member (36) is a compression spring sleeved outside the second insulating rod (33), the lower end of the second elastic member (36) abuts against the second limiting table (381), the upper end of the second elastic member (36) abuts against the second floating insulating sleeve (34), the second insulating rod (33) is provided with a second step (332) with a step surface facing downward, and the inside of the second floating insulating sleeve (34) is provided with a limiting step abutting against the second step (332).

Images