Resistance type spot welding machine capable of being used for welding refrigerator shelf

Abstract

The resistance type spot welding machine comprises a rack, an upper welding head assembly, a lower welding head assembly and a driving device, 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, and a transverse groove is formed in the lower end of the first insulating rod; the first electrode plate is accommodated in the transverse groove. The first insulating rod is sleeved with a first floating insulating sleeve and a first elastic piece which can move up and down relative to 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, a longitudinal groove is formed in the upper end of the second insulating rod, and the second electrode plate is contained in the longitudinal groove. When the spot welding machine is used for welding the intersection point of two metal wires, the welding positions of the two metal wires can be positioned, the spot welding machine can adapt to the sizes of different iron wires, and pseudo soldering or crushing damage is not prone to occurring.

Description

Technical Field

[0001] The invention relates to the technical field of welding of refrigerator shelves, and in particular to a resistance spot welding machine that can be used for welding refrigerator shelves. Background Art

[0002] A refrigerator is an appliance primarily used in shopping malls and supermarkets to display and store merchandise. To facilitate customers' selection of items, refrigerators often feature shelves for displaying and placing various items. These shelves are typically shaped like metal baskets. To produce these shelves, wires are welded together to form a metal mesh, and then a metal frame is welded to the mesh to create a complete shelf.

[0003] In the prior art, a resistance spot welder is generally used to weld the wires 9 into a metal mesh. A typical resistance spot welder consists of two welding heads, one above and one below. The lower welding head is fixed to a machine base, while the upper welding head is mounted on an elastic rod. A cylinder is installed above the upper welding head. During welding, two wires 9 are first placed horizontally and vertically between the two welding heads. The cylinder pushes the upper welding head downward, closing it with the lower welding head and clamping the intersection of the two wires 9. Then, current is passed through the welding heads. The current flows through the workpiece, generating a resistance heating effect, causing the intersection of the wires 9 to fuse, thus achieving welding.

[0004] This welding method has the following problems: First, since the surfaces of the upper and lower welding heads are generally flat, the welding offset problem may occur due to inaccurate positioning of the intersection of the iron wire 9; second, the iron wire 9 is easy to slide when under pressure, resulting in a large deviation in the actual welding point position; third, both welding heads are exposed, which can easily cause burns or electric shocks to the staff; fourth, the heights of different intersections of the iron wire 9 are inconsistent, which can easily lead to cold welding or pressure injuries. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a resistance spot welding machine that can be used to weld refrigerator shelves to solve at least one of the above problems.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] A resistance spot welding machine for welding refrigerator shelves comprises a 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 includes a first mounting rod, a first electrode plate, and a first insulating rod disposed on the first mounting rod. The lower end of the first insulating rod is provided with a transverse groove. The first electrode plate is received in the transverse groove. The lower end surface of the first electrode plate is used to press against a metal wire embedded in the transverse groove. The first insulating rod is sleeved with a first floating insulating sleeve that can move up and down relative to the first insulating rod. The upper portion of the first electrode plate extends out of the first insulating rod and is fixed inside the first floating insulating sleeve. The first floating insulating sleeve is connected to a first elastic member that enables it to maintain its lowest position on the first insulating rod.

[0009] The lower welding head assembly includes 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. The upper end surface of the second electrode plate is used to press the metal wire embedded in the longitudinal groove.

[0010] In a preferred embodiment of the present invention, a second floating insulating sleeve is sleeved on the second insulating rod and can move up and down relative to the second insulating rod. The lower part of the second electrode plate extends out of the second insulating rod and is fixed inside the second floating insulating sleeve. The second floating insulating sleeve is connected to a second elastic member that can enable it to maintain the highest position on the second insulating rod.

[0011] The cam is configured to move the first end of the second support frame upwardly and downwardly, wherein the first end of the second support frame is configured to move the first end of the second support frame upwardly and downwardly, wherein the cam is configured to move the first end of the second support frame upwardly and downwardly, wherein the cam is configured to move the first end of the second support frame upwardly and downwardly,

[0012] In a preferred embodiment of the present invention, a plurality of positioning grooves are arranged at intervals on the inner side wall of the upper end of the first mounting rod, and a blocking block is provided on the first vertical rod to be stuck in the corresponding positioning groove. When the first vertical rod carries the blocking block upward out of the corresponding positioning groove, the first vertical rod can rotate relative to the first mounting rod, and the first locking structure includes a first magnetic member provided on the first mounting rod and a second magnetic member provided on the first vertical rod, and the first magnetic member and the second magnetic member attract each other to limit the blocking block from being disengaged from the corresponding positioning groove.

[0013] In a preferred embodiment of the present invention, all positioning grooves include 4 reference positioning grooves and several special positioning grooves. The 4 reference positioning grooves are evenly distributed along the circumference of the inner wall of the first mounting rod. An indicator dial is provided at the upper end of the first mounting rod. The upper surface of the indicator dial is provided with a scale for indicating the angle. A pointer is provided on the first vertical rod.

[0014] In a preferred embodiment of the present invention, 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, a first limit platform is provided in the middle of the first connecting rod, 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 limit platform, the lower end of the first elastic member abuts against the first floating insulating sleeve, a first step with the step surface facing upward is provided on the first insulating rod, and a limit step abutting against the first step is provided inside the first floating insulating sleeve.

[0015] In a preferred embodiment of the present invention, a plurality of positioning grooves are arranged at intervals on the lower inner side wall of the lower end of the second mounting rod, and a blocking block is provided on the second vertical rod to be stuck in the corresponding positioning groove. When the second vertical rod moves downward out of the corresponding positioning groove with the blocking block, the second vertical rod can rotate relative to the second mounting rod, and the second locking structure includes a third magnetic member provided on the second mounting rod and a fourth magnetic member provided on the second vertical rod, and the third magnetic member and the fourth magnetic member attract each other to limit the blocking block from being disengaged from the corresponding positioning groove.

[0016] In a preferred embodiment of the present invention, the positioning grooves on the second mounting rod are evenly distributed along the circumference of the inner side wall of the first mounting rod, all the positioning grooves on the second mounting rod include 4 reference positioning grooves and several special positioning grooves, the 4 reference positioning grooves are evenly distributed along the circumference of the inner side wall of the first mounting rod, the number of special positioning grooves on the second mounting rod is different from the number of special positioning grooves on the first mounting rod, an indicator dial is fixedly provided on the second vertical rod, the upper surface of the indicator dial is provided with a scale for indicating an angle, and a pointer is provided on the lower end of the second mounting rod.

[0017] In a preferred embodiment of the present invention, 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 embodiment of the present invention, 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 embodiment of the present invention, 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 embodiment of the present invention, 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, a second limit platform is provided in the middle of the second connecting rod, 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 limit platform, the upper end of the second elastic member abuts against the second floating insulating sleeve, a second step with the step surface facing downward is provided on the second insulating rod, and a limit step abutting against the second step is provided inside the second floating insulating sleeve.

[0021] In a preferred embodiment of the present invention, an upper fixing device for fixing the first mounting rod is provided on the lifting seat, and a lower fixing device for fixing the second mounting rod is provided on the lower mounting seat, the upper fixing device includes 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 to 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 that cooperates with the first mounting rod, the lower fixing device includes 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 to 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 that cooperates with the second mounting rod.

[0022] The beneficial effects of the present invention are: first, since the transverse grooves and the longitudinal grooves can respectively position the iron wire, the final actual welding point position deviates slightly from the preset position; second, the first electrode plate and the second electrode plate are both floating designs, which can adapt to the sizes of different iron wires and are not prone to cold welding or crushing. The floating compression spring adapts to the wire diameter tolerance of ±0.5mm; third, the first insulating rod, the second insulating rod, the first floating insulating sleeve, and the second floating insulating sleeve are all insulated, and the first electrode plate and the second electrode plate are not exposed, so the staff will not touch the first electrode plate and the second electrode plate and cause electric shock. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a three-dimensional picture of four metal wires welded together to form the outer frame of the shelf;

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

[0025] Figure 3 yes Figure 2 Enlarged view of part A;

[0026] Figure 4 is a three-dimensional diagram of the upper welding head assembly in Example 1;

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

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

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

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

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

[0032] Figure 10 yes Figure 9 Enlarged view of part B;

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

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

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

[0036] It should be noted that all directional indications in the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the descriptions of "preferred", "sub-preferred", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "preferred" or "sub-preferred" may explicitly or implicitly include at least one such feature.

[0037] Reference Figures 1 to 12The present invention proposes a resistance spot welding machine that can be used to weld refrigerator shelves, including 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] Example 1

[0039] Figures 1 to 8 The embodiment 1 of the present invention is shown. In this embodiment, the spot welding machine further comprises a lifting seat 4 and a lower mounting seat 5. The driving device is used to drive the lifting seat 4 to move up and down.

[0040] The upper welding head assembly 2 and the lower welding head assembly 3 have the same structure, and the difference between them is only in the different installation positions and directions.

[0041] The upper welding head assembly 2 includes a first mounting rod 21 fixedly mounted 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 to press the 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. The first insulating rod 23 is provided with a first floating insulating sleeve 24 that can move up and down relative to it. The upper part of the first electrode plate 22 extends outward from the first insulating rod 23 and is fixed to the inside of the first floating insulating sleeve 24. The first floating insulating sleeve 24 is provided with a wiring terminal 25 electrically connected to the first electrode plate 22 for supplying power to the first electrode plate 22. The first floating insulating sleeve 24 is connected to a first elastic member 26 that enables it to maintain the lowest position on the first insulating rod 23.

[0042] The lower welding head assembly 3 includes a second mounting rod 31, a second electrode plate 32, and a second insulating rod 33 mounted on the second mounting rod 31. A longitudinal groove 331 is provided at the upper end of the second insulating rod 33. The second electrode plate 32 is received in the longitudinal groove 331. The upper end surface of the second electrode plate 32 is used to press against 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 is sleeved on the second insulating rod 33, which is movable up and down relative to the second insulating rod 33. The lower portion of the second electrode plate 32 extends outward from the second insulating rod 33 and is fixed within the second floating insulating sleeve 34. The second floating insulating sleeve 34 is provided with a terminal 25 electrically connected to the second electrode plate 32 for supplying power to the second electrode plate 32. The second floating insulating sleeve 34 is connected to a second elastic member 36, which enables it to maintain its highest position on the second insulating rod 33.

[0043] The driving device can use a cylinder 8 as a power source, or a servo motor as a power source, wherein the cylinder is the best. Taking the cylinder 8 as an example, the welding operation process of the present embodiment for the production process of the refrigerator shelf is as follows: first, the iron wire 9 is placed on the mold for positioning, so that the longitudinal iron wire 9 is at the bottom and the transverse iron wire 9 is at the top; 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, and the cylinder 8 pushes the upper welding head assembly 2 downward. After the upper welding head assembly 2 moves a certain distance, the transverse iron wire 9 is embedded in the transverse groove 231 of the first insulating rod 23 and is compressed by the first electrode plate 22. Then, current is passed through 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 heating effect to fuse the intersection of the iron wires 9 and achieve welding.

[0044] The advantages of this design are: first, since the transverse groove 231 and the longitudinal groove 331 can respectively position the iron wire 9, the final 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 the sizes of different iron wires 9 and are not prone to cold welding or crushing; 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 and 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 or other materials such as Bakelite. A slight gap can be left between the first electrode plate 22 and the inner sidewall of the transverse groove, and between the second electrode plate 32 and the inner sidewall of the longitudinal groove, to compensate for the difference in material expansion between the metal and insulating materials after heating. Both the transverse and longitudinal grooves are through-grooves, which can also compensate to a certain extent for the difference in material expansion between the metal and insulating materials after heating.

[0046] When a servo motor is used as the power source, a pressure sensor can be used to measure the pressure between the second electrode plate 32 and the metal wire. 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 compressed. At this time, the lifting seat 4 remains at this height position, and the two metal wires are spot welded. After welding for a short period of 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 to this embodiment, the first mounting rod 21 is hollow and tubular, and the upper end of the first insulating rod 23 is fixedly connected to a first vertical rod 27 that extends through 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 position. A first locking structure capable of locking the first mounting rod 21 and the first vertical rod 27 is provided between the first mounting rod 21 and the first vertical rod 27. The second mounting rod 31 is hollow and tubular, and the lower end of the second insulating rod 33 is fixedly connected to a second vertical rod 37 that extends through 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 position. A second locking structure capable of locking the second mounting rod 31 and the second vertical rod 37 is provided between the second mounting rod 31 and the second vertical rod 37.

[0048] Specifically, four positioning slots 211 are spaced apart on the inner sidewall of the upper end of the first mounting rod 21. The four positioning slots 211 are evenly distributed along the circumference of the inner sidewall of the first mounting rod 21. A latching block 271 is provided on the first vertical rod 27, which is engaged with the corresponding positioning slot 211. When the first vertical rod 27 moves upward out of the corresponding positioning slot 211 with the latching block 271, the first vertical rod 27 can rotate relative to the first mounting rod 21. The first locking structure includes a first magnetic member 61 provided on the first mounting rod 21 and a second magnetic member 62 provided on the first vertical rod 27. The first magnetic member 61 and the second magnetic member 62 attract each other to prevent the latching block 271 from being disengaged from the corresponding positioning slot 211. The lower end of the first vertical rod 27 is screwed with the first connecting rod 28, and the lower end of the first connecting rod 28 is screwed with the first insulating rod 23. A first limit platform 281 is provided in the middle of the first connecting rod 28. 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 limit platform 281, and the lower end of the first elastic member 26 abuts against the first floating insulating sleeve 24. A first step 232 with the step surface facing upward is provided on the first insulating rod 23, and a limit step abutting against the first step 232 is provided inside the first floating insulating sleeve 24.

[0049] A plurality of positioning grooves 211 are arranged at intervals on the lower inner side wall of the lower end of the second mounting rod 31, and a blocking block 271 is provided on the second vertical rod 37 to be stuck in the corresponding positioning groove 211. When the second vertical rod 37 moves downward out of the corresponding positioning groove 211 with the blocking block 271, the second vertical rod 37 can rotate relative to the second mounting rod 31. The second locking structure includes a third magnetic component 63 provided on the second mounting rod 31 and a fourth magnetic component 64 provided on the second vertical rod 37. The third magnetic component 63 and the fourth magnetic component 64 attract each other to prevent the blocking block 271 from escaping from the corresponding positioning groove 211. The upper end of the second vertical rod 37 is screwed with the 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 limit platform 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 limit platform 381, and the upper end of the second elastic member 36 abuts against the second floating insulating sleeve 34. A second step 332 with the step surface facing downward is provided on the second insulating rod 33, and a limit step abutting against the second step 332 is provided inside the second floating insulating sleeve 34.

[0050] Specifically, both ends of the first connecting rod 28 and the second connecting rod are screw rods. 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 iron wire 9 corresponding to the upper welding head assembly 2 is arranged longitudinally and the iron wire 9 corresponding to the lower welding head assembly 3 is arranged transversely, and the workpiece is not convenient to rotate 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 the longitudinal state, and the longitudinal groove 331 on the lower welding head assembly 3 is switched to the transverse state. Taking the above welding head assembly 2 as an example, the adjustment method is as follows: the staff overcomes the magnetic attraction and pulls the first vertical rod 27 upward so that the block 271 on the first vertical rod 27 is disengaged from the corresponding positioning groove 211. Then, the first vertical rod 27 is rotated 90 degrees, and the first insulating rod 23 and the first electrode plate 22 are rotated 90 degrees together. Finally, the first vertical rod 27 is inserted downward so that the positioning groove 211 is inserted into the other positioning groove 211. The lower welding head assembly 3 has the same structure as the upper welding head assembly 2, and the adjustment method is basically the same.

[0052] In order to facilitate pulling out the first vertical rod 27 and the second vertical rod 37 , a ball-shaped handle 100 is provided at the upper end of the first vertical rod 27 and the lower end of the second vertical rod 37 .

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

[0054] In this embodiment, an annular platform is provided on the outer wall of the first vertical rod 27, and a magnet groove is provided on the lower end surface of the annular platform. 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 iron block arranged in the blind hole.

[0055] In addition to the magnetic structure, the first locking structure and the second locking structure can also adopt other structural forms, such as locking by screws, locking by radial elastic pins, etc.

[0056] Example 2

[0057] Figures 9 to 12 Example 2 of the present invention is shown. This example has a similar structure to Example 1. The difference is that, based on Example 1, this example increases the angle adjustment range of the transverse groove 231 and the longitudinal groove 331, adds an angle indicating device, and also fine-tunes the installation positions of the first magnetic component 61 and the second magnetic component 62.

[0058] The specific differences are as follows: First, in this embodiment, all positioning grooves 211 on the first mounting rod 21 include four reference positioning grooves 2111 and 20 special positioning grooves 2112. All positioning grooves 211 are evenly distributed along the circumference of the inner side wall of the first mounting rod 21. The four reference positioning grooves 2111 are evenly distributed along the circumference of the inner side wall of the first mounting rod 21, corresponding to 0 degrees, 90 degrees, 180 degrees, and 270 degrees, respectively. The number of special positioning grooves 2112 between every two reference positioning grooves 2111 is five, and the special positioning groove 2112 between the two reference positioning grooves 2111 corresponding to 0 degrees and 90 degrees corresponds to 15 degrees, 30 degrees, 45 degrees, 60 degrees, and 75 degrees, respectively. An indicator disk 701 is provided at the top end of the first mounting rod 21, and the upper surface of the indicator disk 701 is provided with a scale for indicating an angle. A pointer 702 is mounted on the first vertical rod 27.

[0059] All positioning slots 211 on the second mounting rod 31 include four reference positioning slots 2111 and 32 special positioning slots 2112. All positioning slots 211 are evenly distributed along the circumference of the inner sidewall of the first mounting rod 21. The four reference positioning slots 2111 are evenly distributed along the circumference of the inner sidewall of the first mounting rod 21, corresponding to 0 degrees, 90 degrees, 180 degrees, and 270 degrees, respectively. There are eight special positioning slots 2112 between every two reference positioning slots 2111, with the special positioning slots 2112 between the two reference positioning slots 2111 corresponding to 0 degrees and 90 degrees corresponding to 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees, and 80 degrees, respectively. An indicator disk 701 is fixedly mounted on the second vertical rod 37. The upper surface of the indicator disk 701 is provided with a scale for indicating an angle. A pointer 702 is mounted on the lower end of the second mounting rod 31.

[0060] Second, in this 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 this embodiment and Example 1. In the upper welding head assembly 2, an annular platform is provided on the outer wall of the first vertical rod 27, and a magnet groove is provided on the lower end face of the annular platform. The second magnetic member 62 is a magnet provided in the magnet groove, and a blind hole directly opposite to the magnet groove is provided on the indicator disk 701. The first magnetic member 61 is a magnet or an iron block provided in the blind hole. In the lower welding head assembly 3, an annular groove is provided on the indicator disk 701, and the third magnetic member 63 is a magnet provided in the annular groove. A blind hole directly opposite to the annular groove is provided on the lower end face of the second vertical rod 37, and the third magnetic member 63 is a magnet or an iron block provided in the magnet groove.

[0061] Compared to Example 1, this embodiment has the advantage that it is not only suitable for welding the perpendicular intersection of two wires 9, but can also weld the oblique intersection of two wires 9 as needed. Furthermore, by only providing a positioning slot 211 every 15 degrees on the first mounting rod 21 and a positioning slot 211 every 10 degrees on the second mounting rod 31, the minimum adjustment range reaches 5 degrees. As long as the angle between the two wires 9 is a multiple of 5 degrees, welding can be performed. For example, if the angle between the two wires 9 is 5 degrees, the 0 o'clock scales 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 15 degrees and the pointer 702 on the lower welding head assembly 3 indicates 10 degrees, the angle between the two is 5 degrees. When the pointer 702 on the upper welding head assembly 2 indicates 15 degrees and the pointer 702 on the lower welding head assembly 3 indicates 50 degrees, the angle between the two is 35 degrees. This wide adjustment range and wide applicability.

[0062] Example 3

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

[0064] In this embodiment, 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.

[0065] That is, the first mounting rod has 12 locating slots, and the angle between two adjacent locating slots spans 30 degrees. The second mounting rod has 16 locating slots, and the angle between two adjacent locating slots spans 22.5 degrees, resulting in an angle difference of 7.5 degrees. When the pointer 702 on the upper welding head assembly 2 indicates 30 degrees and the pointer 702 on the lower welding head assembly 3 indicates 22.5 degrees, the angle between the two is 7.5 degrees, bringing the minimum adjustment range to 7.5 degrees. As long as the angle between the two wires 9 is a multiple of 7.5 degrees, welding can be performed.

[0066] Example 4

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

[0068] In this embodiment, 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.

[0069] That is, the first mounting rod has 16 locating slots, and the angle between two adjacent locating slots spans 22.5 degrees. The second mounting rod has 24 locating slots, and the angle between two adjacent locating slots spans 15 degrees, resulting in an angle difference of 7.5 degrees. When the pointer 702 on the upper welding head assembly 2 indicates 22.5 degrees and the pointer 702 on the lower welding head assembly 3 indicates 15 degrees, the angle between the two is 7.5 degrees, bringing the minimum adjustment range to 7.5 degrees. As long as the angle between the two wires 9 is a multiple of 7.5 degrees, welding can be performed.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A resistance spot welding machine for welding refrigerator shelves, comprising a frame (1), an upper welding head assembly (2), a lower welding head assembly (3), 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, characterized in that: The upper welding head assembly (2) includes a first mounting rod (21), a first electrode plate (22), and a first insulating rod (23) arranged on the first mounting rod (21); a transverse groove (231) is provided at the lower end of the first insulating rod (23); 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 metal wire embedded in the transverse groove (231); a first floating insulating sleeve (24) is sleeved on the first insulating rod (23) and can move up and down relative to 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); the first floating insulating sleeve (24) is connected to a first elastic member (26) capable of maintaining the first floating insulating sleeve at the lowest position on the first insulating rod (23); 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); a longitudinal groove (331) is provided at the upper end of the second insulating rod (33); 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 a metal wire embedded in the longitudinal groove (331).

2. A resistance spot welding machine for welding refrigerator shelves according to claim 1, characterized in that: The second insulating rod (33) is sleeved with a second floating insulating sleeve (34) that can move 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); the second floating insulating sleeve (34) is connected to a second elastic member (36) that can keep it at the highest position on the second insulating rod (33).

3. The resistance spot welding machine for welding refrigerator shelves according to claim 2, characterized in that: The invention also includes a lifting seat (4) and a lower mounting seat (5), wherein the driving device is used to drive the lifting seat (4) to move up and down, the first mounting rod (21) is mounted on the lifting seat (4), and the second mounting rod (31) is mounted on the lower mounting seat (5), the first mounting rod (21) is hollow and tubular, and the upper end of the first insulating rod (23) is fixedly connected to a first vertical rod (27) that passes through the inner hole of the first mounting rod (21), and the first vertical rod (27) can move relative to the first mounting rod (21) under the action of an external force so that the transverse groove (231) of the first insulating rod (23) is switched to the longitudinal groove. In a horizontal state, a first locking structure capable of locking the first mounting rod (21) and the first vertical rod (27) is provided between the first mounting rod (21) and the first vertical rod (27), the second mounting rod (31) is hollow and tubular, the lower end of the second insulating rod (33) is fixedly connected to 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 so that the longitudinal groove (331) of the second insulating rod (33) is switched to a horizontal state, and a second locking structure capable of locking the second mounting rod (31) and the second vertical rod (37) is provided between the second mounting rod (31) and the second vertical rod (37).

4. The resistance spot welding machine for welding refrigerator shelves according to claim 3, characterized in that: A plurality of positioning grooves (211) are arranged at intervals on the inner side wall of the upper end of the first mounting rod (21); a clamping block (271) is arranged on the first vertical rod (27) and is clamped in the corresponding positioning groove (211); when the first vertical rod (27) moves upward out of the corresponding positioning groove (211) with the clamping block (271), the first vertical rod (27) can rotate relative to the first mounting rod (21); the first locking structure includes a first magnetic member (61) arranged on the first mounting rod (21) and a second magnetic member (62) arranged on the first vertical rod (27); the first magnetic member (61) and the second magnetic member (62) attract each other to limit the clamping block (271) from being disengaged from the corresponding positioning groove (211).

5. The resistance spot welding machine for welding refrigerator shelves according to claim 4, characterized in that: The positioning grooves (211) are evenly 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) include four reference positioning grooves (2111) and a plurality of special positioning grooves (2112). The four reference positioning grooves (2111) are evenly distributed along the circumference of the inner side wall of the first mounting rod (21). An indicator disk (701) is provided at the upper end of the first mounting rod (21). A scale for indicating an angle is provided on the upper surface of the indicator disk (701). A pointer (702) is sleeved on the first vertical rod (27).

6. The resistance spot welding machine for welding refrigerator shelves according to claim 3, characterized in that: 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 limit platform (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) is in contact with the first limit platform (281), the lower end of the first elastic member (26) is in contact with the first floating insulating sleeve (24), the first insulating rod (23) is provided with a first step (232) with the step surface facing upward, and the interior of the first floating insulating sleeve (24) is provided with a limit step in contact with the first step (232).

7. The resistance spot welding machine for welding refrigerator shelves according to claim 5, characterized in that: A plurality of positioning grooves (211) are arranged at intervals on the lower inner side wall of the lower end of the second mounting rod (31); a block (271) is arranged on the second vertical rod (37) and is clamped in the corresponding positioning groove (211); when the second vertical rod (37) moves downward out of the corresponding positioning groove (211) with the block (271), the second vertical rod (37) can rotate relative to the second mounting rod (31); the second locking structure includes a third magnetic member (63) arranged on the second mounting rod (31) and a fourth magnetic member (64) arranged on the second vertical rod (37); the third magnetic member (63) and the fourth magnetic member (64) attract each other to limit the block (271) from being disengaged from the corresponding positioning groove (211).

8. The resistance spot welding machine for welding refrigerator shelves according to claim 7, characterized in that: 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); an indicator disk (701) is fixedly provided on the second vertical rod (37); a scale for indicating an angle is provided on the upper surface of the indicator disk (701); and a pointer (702) is sleeved on the lower end of the second mounting rod (31).

9. The resistance spot welding machine for welding refrigerator shelves according to claim 8, characterized in that: The number of special positioning slots on the first mounting rod is 20, and the number of special positioning slots on the second mounting rod is 32; Or 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; Alternatively, 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.

10. The resistance spot welding machine for welding refrigerator shelves according to claim 7, characterized in that: 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 a second limiting platform (381) is provided in the middle of the second connecting rod (38). 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 platform (381), and the upper end of the second elastic member (36) abuts against the second floating insulating sleeve (34). A second step (332) with a step surface facing downward is provided on the second insulating rod (33), and a limiting step abutting against the second step (332) is provided inside the second floating insulating sleeve (34).

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