A nut spot welding machine

Abstract

The utility model discloses a nut spot welding machine, including: a main box and a round box, an electric telescopic rod is fixedly installed on the upper side of the main box near one side of the round box through a bracket, a moving electrode is fixedly installed on the electric telescopic rod through a mounting plate arranged at its movable end, a spot welding head is fixedly installed at the welding head of the moving electrode, a static electrode is fixedly installed on one side of the main box near the round box and below the spot welding head, a rotating disk is rotatably installed on the top of the round box, and four workpiece clamping assemblies are fixedly arranged in a circular shape at equal intervals on the top of the rotating disk. This nut spot welding machine mechanically pushes the square tube to move to one side of the static electrode, and the distance of each advancement is controllable and accurate, thereby ensuring the accuracy of the welding point between the square tube and the nut each time, and there is no fatigue of manual repetitive work in mechanical operation, thereby ensuring the accuracy of the welding point, improving product quality and work efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of spot welding machines, in particular to a nut spot welding machine. Background Art

[0002] The nut spot welder is a welding device specially used for nut spot welding. It connects the nut to the metal parts by resistance welding. This equipment can improve the efficiency of nut spot welding, and can ensure the welding strength of the nut while keeping the welding appearance and thread of the nut from deformation, achieving high-quality, high-performance and high-standard welding effects.

[0003] The nut spot welding machine has a variety of application fields. One of them is used to weld nuts in the inner cavity of square tubes. At present, when welding, the square tube is manually held and inserted into the electrolytic electrode. The welding points of the nut and the square tube are aligned by workers' visual inspection. The workers repeat the operation, are prone to fatigue and have low work efficiency. At the same time, the accuracy of the welding points cannot be guaranteed and the product quality is not high. Utility Model Content

[0004] The purpose of the utility model is to provide a nut spot welding machine to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A nut spot welding machine comprises: a main box and a round box, an electric telescopic rod is fixedly installed on the upper side of the main box near the round box through a bracket, a moving electrode is fixedly installed on the electric telescopic rod through a mounting connecting plate arranged at the movable end, a spot welding head is fixedly installed at the welding head of the moving electrode, a static electrode is fixedly installed on the side of the main box near the round box and below the spot welding head, and a nut placement groove for placing nuts is provided at the top of the static electrode and directly below the spot welding head;

[0007] A rotating disk is rotatably installed on the top of the round box, and four workpiece clamping assemblies are fixedly arranged in a ring shape at equal intervals on the top of the rotating disk. A through cavity is penetrated through the top of the rotating disk and directly below each workpiece clamping assembly, and a driving displacement assembly for driving the movable end of the workpiece clamping assembly to move is fixedly installed on the top of the round box.

[0008] As an improved technical solution, a vertical shaft is rotatably installed at the center of the top of the round box through a bearing, and the top end of the vertical shaft is welded to the center of the bottom of the rotating disk. A servo motor for driving the vertical shaft to rotate is fixedly installed inside the round box, and a supporting slide column is fixedly installed on the outer edge of the bottom of the rotating disk, and a universal ball is fixedly installed on the bottom of the supporting slide column.

[0009] As an improved technical solution, the workpiece clamping assembly includes two dovetail slides fixed on the top of the rotating disk, a dovetail slide bar with the same length as the dovetail slide bar is slidably installed in the sliding cavity of the dovetail slide bar, a supporting plate is fixedly connected between the tops of the two dovetail slide bars, and a limiting groove is opened on the top of the supporting plate.

[0010] As an improved technical solution, a fixed baffle and a threaded hole plate are welded on the top of the supporting plate and on both sides of the limiting groove. The threaded hole plate is threadedly installed with a threaded rod through the threaded hole opened thereon. A clamping plate is welded on one end of the threaded rod close to the fixed baffle, and a rubber sheet is bonded to the end of the clamping plate away from the threaded rod.

[0011] As an improved technical solution, a linkage block is welded to one side of the bottom of the supporting plate, and two clamping holes are provided on the top of the linkage block. The driving displacement assembly includes a linear motor installed on the top of the round box, and an electric telescopic rod 2 is fixedly installed on the movable end of the linear motor, and a lifting bar is fixedly installed on the movable end of the electric telescopic rod 2, and clamping columns that are clamped with the clamping holes are installed on both sides of the top of the lifting bar.

[0012] As an improved technical solution, a magnet block is fixedly installed on one side of the dovetail slide away from the open end of the limiting groove, and an iron sheet is embedded and installed on one side of the dovetail slide close to the magnet block, and the iron sheet and the magnet block are magnetically attracted.

[0013] As an improved technical solution, a positioning head is fixedly installed at the center of the circle at the bottom of the spot welding head, and the bottom end of the positioning head is semicircular.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model makes the pressing plate move to one side of the fixed baffle plate and abut against the other side of the square tube, and then clamps the square tube between the fixed baffle plate and the pressing plate. After clamping the square tube, it is welded with the nut. During the welding process, the square tube vibrates and moves to ensure the accuracy of the welding point, thereby ensuring the quality of welding.

[0016] 2. In the present invention, the dovetail slide is slidably installed in the slide cavity of the dovetail slide seat. The dovetail slide is completely pulled out of the slide cavity of the dovetail slide seat from the side, and the bearing plate can be disassembled. According to the different sizes of the required welded square tubes, the bearing plate with the corresponding size of the limiting groove is replaced, and the adaptability is high; on the one hand, the magnet block plays a role in blocking the dovetail slide, ensuring the accuracy of the position of the bearing plate after resetting, and avoiding excessive inward movement of the bearing plate. At the same time, the magnetic adsorption of the magnet block and the iron sheet can prevent the bearing plate from sliding after resetting, ensuring that the clamping column can accurately enter the internal clamping hole for clamping.

[0017] 3. In the present invention, the square tube is mechanically pushed to move toward one side of the static electrode, and the distance of each advancement is controllable and accurate, thereby ensuring the accuracy of the welding point between the square tube and the nut each time. Mechanical operation does not cause fatigue caused by manual repetitive work, thereby ensuring the accuracy of the welding point and improving product quality and work efficiency.

[0018] 4. In the present invention, when the spot welding head moves downward, the positioning head first passes through the through hole on the square tube and enters the inner hole of the nut. At this time, it is determined that the nut is accurately located at the welding point of the square tube. If the positioning head cannot be inserted into the inner hole of the nut, it means that the placement is misplaced and welding is not performed, which plays a further positioning role and ensures the quality of welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a nut spot welding machine;

[0020] Figure 2 It is a structural schematic diagram of a main box in a nut spot welding machine;

[0021] Figure 3 It is a structural schematic diagram of a round box in a nut spot welding machine;

[0022] Figure 4 It is a structural schematic diagram of a workpiece clamping assembly in a nut spot welding machine;

[0023] Figure 5 The figure is a schematic diagram of the structure of a driving displacement component in a nut spot welding machine.

[0024] In the figure: 1. main box; 2. electric telescopic rod 1; 3. moving electrode; 4. spot welding head; 5. static electrode; 6. round box; 7. supporting slide column; 8. rotating disk; 9. workpiece clamping assembly; 91. bearing plate; 92. fixed baffle; 93. limiting groove; 94. dovetail slide; 95. threaded hole plate; 96. threaded rod; 97. clamping plate; 98. rubber sheet; 99. iron sheet; 910. magnet block; 911. linkage block; 912. dovetail slide; 10. positioning head; 11. nut placement groove; 12. through cavity; 13. drive displacement assembly; 131. linear motor; 132. electric telescopic rod 2; 133. lifting strip; 134. clamping column; 135. clamping hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example 1

[0027] See also Figures 1 to 5 , the utility model embodiment provides a nut spot welding machine, 1. comprising: a main box 1 and a round box 6, an electric telescopic rod 2 is fixedly installed on the upper side of the main box 1 near the round box 6 through a bracket, the movable end of the electric telescopic rod 2 is located below the bracket, the electric telescopic rod 2 is fixedly installed with a moving electrode 3 through a mounting connecting plate arranged at its movable end, and a spot welding head 4 is fixedly installed at the welding head of the moving electrode 3, a static electrode 5 is fixedly installed on one side of the main box 1 near the round box 6 and located below the spot welding head 4, a nut placement groove 11 for placing nuts is opened at the top of the static electrode 5 and located directly below the spot welding head 4, and a nut automatic feeding component can also be equipped to realize automatic feeding of nuts into the nut placement groove 11. The nut feeding component is an existing mature technology, so it is not described in detail. A spot welding host is installed inside the main box 1, and the electric welding host is connected to the moving electrode 3 and the static electrode 5 respectively through wires. Spot welding is an existing mature technology, so it is not described in detail;

[0028] A rotating disk 8 is rotatably installed on the top of the round box 6, and four workpiece clamping assemblies 9 are fixedly arranged in a ring shape at equal intervals on the top of the rotating disk 8. A through cavity 12 is penetrated through the top of the rotating disk 8 and directly below each workpiece clamping assembly 9, and a driving displacement assembly 13 for driving the movable end of the workpiece clamping assembly 9 to move is fixedly installed on the top of the round box 6.

[0029] The square tube is mechanically pushed to move toward one side of the static electrode 5, and the distance of each advancement is controllable and accurate, thereby ensuring the accuracy of the welding point between the square tube and the nut each time. Mechanical operation does not cause fatigue caused by manual repetitive work, thereby ensuring the accuracy of the welding point and improving product quality and work efficiency.

[0030] A vertical shaft is rotatably installed at the center of the top of the circular box 6 through a bearing, and the top end of the vertical shaft is welded to the center of the bottom of the rotating disk 8. A servo motor for driving the vertical shaft to rotate is fixedly installed inside the circular box 6, and the driving end of the servo motor is connected to the bottom end of the rotating disk 8. A supporting slide column 7 is fixedly installed on the outer edge of the bottom of the rotating disk 8, and a universal ball is fixedly installed on the bottom of the supporting slide column 7, and the universal ball rolls on the top of the circular box 6. The supporting slide column 7 and the universal ball at its bottom play a supporting role for the rotating disk 8, and evenly distributes the force of the rotating disk 8 to the circular box 6, thereby ensuring the stability of the device operation.

[0031] The workpiece clamping assembly 9 includes two dovetail slides 94 fixed on the top of the rotating disk 8, and the two dovetail slides 94 are located on both sides of the through cavity 12. A dovetail slide 912 of the same length as the dovetail slide 94 is slidably installed in the sliding cavity of the dovetail slide 94, and a supporting plate 91 is fixedly connected between the tops of the two dovetail slides 912. A limiting groove 93 is provided on the top of the supporting plate 91. The dovetail slide 912 is slidably installed in the sliding cavity of the dovetail slide 94. The dovetail slide 912 can be completely pulled out of the sliding cavity of the dovetail slide 94 from the side, and the supporting plate 91 can be disassembled. According to the different sizes of the required welded square tubes, the supporting plate 91 with the limiting groove 93 of the corresponding size can be replaced, and the adaptability is high.

[0032] A fixed baffle 92 and a threaded hole plate 95 are welded to the top of the carrying plate 91 and on both sides of the limiting groove 93, respectively. The threaded hole plate 95 is threadedly installed with a threaded rod 96 through the threaded hole opened thereon, and a rotating handle is welded to the end of the threaded rod 96 away from the fixed baffle 92, and a clamping plate 97 is welded to the end of the threaded rod 96 close to the fixed baffle 92, and a rubber sheet 98 is bonded to the end of the clamping plate 97 away from the threaded rod 96, which drives the threaded rod 96 to rotate. Under the threaded transmission action of the threaded rod 96 and the threaded holes on the threaded hole plate 95, the clamping plate 97 moves to one side of the fixed baffle 92 and contacts the other side of the square tube, thereby clamping the square tube between the fixed baffle 92 and the clamping plate 97, and then welds the square tube to the nut after clamping it. The square tube vibrates and moves during the welding process to ensure the accuracy of the welding point and thus the quality of the welding.

[0033] A linkage block 911 is welded to one side of the bottom of the carrier plate 91, and two clamping holes 135 are provided on the top of the linkage block 911. The driving displacement assembly 13 includes a linear motor 131 installed on the top of the round box 6. An electric telescopic rod 132 is fixedly installed on the movable end of the linear motor 131, and a lifting bar 133 is fixedly installed on the movable end of the electric telescopic rod 132. A clamping column 134 clamped with the clamping hole 135 is installed on both sides of the top of the lifting bar 133. The electric telescopic rod 132 telescopically drives the clamping column 134 to enter the interior of the clamping hole 135, so that the linear motor 131 can directly drive the linkage block 911 to move, so that one driving source can drive multiple workpiece clamping assemblies 9 to move, thereby reducing the manufacturing and use costs.

[0034] A magnet block 910 is fixedly installed on one side of the dovetail slide 94 away from the open end of the limiting groove 93, and an iron sheet 99 is inlaid and installed on the side of the dovetail slide 912 close to the magnet block 910, and the iron sheet 99 is magnetically attracted to the magnet block 910. On the one hand, the magnet block 910 blocks the dovetail slide 912 to ensure the accuracy of the position of the supporting plate 91 after the reset and prevent the supporting plate 91 from moving excessively inward. At the same time, the magnetic adsorption of the magnet block 910 and the iron sheet 99 prevents the supporting plate 91 from sliding after the reset, ensuring that the clamping column 134 can accurately enter the internal clamping hole 135 for clamping.

[0035] A positioning head 10 is fixedly installed at the center of the bottom of the spot welding head 4, and the bottom end of the positioning head 10 is semicircular. When the spot welding head 4 moves downward, the positioning head 10 first passes through the through hole on the square tube and enters the inner hole of the nut. At this time, it is determined that the nut is accurately located at the welding point of the square tube. If the positioning head 10 cannot be inserted into the inner hole of the nut, it means that the placement is misplaced and welding is not performed, which plays a further positioning role to ensure the quality of welding.

[0036] The working principle of the utility model is:

[0037] When in use, the process of fixing the square tube on the workpiece clamping assembly 9 is as follows: the square tube is placed inside the limiting groove 93, the size of the limiting groove 93 is adapted to the size of the corresponding square tube, and at this time one side of the square tube is in conflict with the fixed baffle 92;

[0038] After the square tube is fixed, the nut is conveyed to the inside of the nut placement groove 11 by manual or automatic nut feeding assembly, and the servo motor drives the rotating disk 8 to rotate, and the square tube rotates to one side of the static electrode 5. At this time, the electric telescopic rod 132 is extended to drive the clamping column 134 to move upward, so that the clamping column 134 enters the internal clamping hole 135, and then the linear motor 131 drives the electric telescopic rod 132 to move to one side of the static electrode 5, and then pushes the square tube to one side of the static electrode 5, so that the static electrode 5 is inserted into the inside of the square tube. When it reaches the preset welding position, The driving displacement assembly 13 stops, and the electric telescopic rod 1 drives the spot welding head 4 to move downward, so that the spot welding head 4 is pressed on the upper surface of the square tube, and the upper surface of the nut contacts the inner wall of the square tube, and the nut is spot welded to the inner wall of the square tube. After the welding is completed, the linear motor 131 drives the square tube to move to the opposite side of the static electrode 5, so that the static electrode 5 is separated from the inside of the square tube, and the nut placement groove 11 is refilled with the nut, and then welding is performed again. When the nut on the square tube is completely welded, the electric telescopic rod 2 132 is shortened to separate the clamping column 134 from the inside of the clamping hole 135;

[0039] The servo motor drives the square tube to rotate again, and the above steps are repeated to continuously weld the square tube, and the assembly line welding work is continued.

[0040] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A nut spot welding machine, characterized in that: include: A main box (1) and a round box (6), wherein an electric telescopic rod (2) is fixedly mounted on the upper side of the main box (1) close to the round box (6) through a bracket, and a moving electrode (3) is fixedly mounted on the electric telescopic rod (2) through a mounting connecting plate arranged at the movable end thereof, and a spot welding head (4) is fixedly mounted at the welding head of the moving electrode (3), and a static electrode (5) is fixedly mounted on the side of the main box (1) close to the round box (6) and located below the spot welding head (4), and a nut placement groove (11) for placing a nut is provided at the top of the static electrode (5) and located directly below the spot welding head (4); A rotating disk (8) is rotatably mounted on the top of the circular box (6); four workpiece clamping assemblies (9) are fixedly mounted in a circular shape at equal intervals on the top of the rotating disk (8); a through cavity (12) is provided through the top of the rotating disk (8) and directly below each workpiece clamping assembly (9); and a driving displacement assembly (13) for driving the movable end of the workpiece clamping assembly (9) to move is fixedly mounted on the top of the circular box (6).

2. A nut spot welding machine according to claim 1, characterized in that: A vertical shaft is rotatably mounted at the center of the top of the circular box (6) via a bearing, and the top end of the vertical shaft is welded to the center of the bottom of the rotating disk (8). A servo motor for driving the vertical shaft to rotate is fixedly mounted inside the circular box (6). A supporting slide column (7) is fixedly mounted on the outer edge of the bottom of the rotating disk (8), and a universal ball is fixedly mounted on the bottom of the supporting slide column (7).

3. A nut spot welding machine according to claim 2, characterized in that: The workpiece clamping assembly (9) includes two dovetail slides (94) fixed on the top of the rotating disk (8), a dovetail slide bar (912) of the same length as the dovetail slide bar (94) is slidably installed in the slide cavity of the dovetail slide (94), a supporting plate (91) is fixedly connected between the tops of the two dovetail slide bars (912), and a limiting groove (93) is provided on the top of the supporting plate (91).

4. A nut spot welding machine according to claim 3, characterized in that: A fixed baffle (92) and a threaded hole plate (95) are welded to the top of the bearing plate (91) and on both sides of the limiting groove (93), respectively; a threaded rod (96) is threadedly mounted on the threaded hole of the threaded hole plate (95) through a threaded hole provided thereon; a clamping sheet (97) is welded to one end of the threaded rod (96) close to the fixed baffle (92); and a rubber sheet (98) is bonded to one end of the clamping sheet (97) away from the threaded rod (96).

5. A nut spot welding machine according to claim 4, characterized in that: A linkage block (911) is welded to one side of the bottom of the bearing plate (91), and two clamping holes (135) are provided on the top of the linkage block (911). The driving displacement assembly (13) comprises a linear motor (131) mounted on the top of the round box (6), and a second electric telescopic rod (132) is fixedly mounted on the movable end of the linear motor (131), and a lifting bar (133) is fixedly mounted on the movable end of the second electric telescopic rod (132), and clamping columns (134) clamped with the clamping holes (135) are mounted on both sides of the top of the lifting bar (133).

6. A nut spot welding machine according to claim 5, characterized in that: A magnet block (910) is fixedly mounted on one side of the dovetail slide seat (94) away from the open end of the limiting groove (93), and an iron sheet (99) is embedded and mounted on one side of the dovetail slide bar (912) close to the magnet block (910), and the iron sheet (99) and the magnet block (910) are magnetically attracted to each other.

7. A nut spot welding machine according to claim 6, characterized in that: A positioning head (10) is fixedly installed at the center of the bottom of the spot welding head (4), and the bottom end of the positioning head (10) is semicircular.

Images