Automatic transmission safety device for preventing mechanical damage to welding nuts of projection welding machine

Abstract

The utility model relates to an automatic transmission safety device for preventing mechanical damage to welding nuts of a projection welding machine, which comprises an upper support and a lower support which are arranged on the front portion of a machine body, an air cylinder pressurizing mechanism is arranged on the upper support, an upper electrode seat is arranged at the lower end of a piston rod of the air cylinder pressurizing mechanism, and a lower electrode seat is arranged on the lower support. An upper electrode tip is vertically arranged in the middle of the upper electrode base, the lower portion of the upper electrode tip is bent outwards to form an L-shaped electrode tip, and a lower electrode tip right opposite to the L-shaped electrode tip is arranged at the outer end of the lower electrode base. A nut conveying mechanism is obliquely installed on one side of the upper electrode base through a supporting rod. The L-shaped electrode tip transfers a welding point to the outer side from the position under the upper electrode base, sight is prevented from being blocked when a nut is welded to a workpiece, the nut is ejected out through a telescopic rod in the nut conveying mechanism and accurately placed on the lower electrode tip, the nut does not need to be placed to the welding position with hands, and the welding efficiency is improved. The phenomenon that fingers are pinched due to the fact that hands and feet are not well coordinated is avoided, and serious safety accidents are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of bodywork parts projection welding, especially relates to a safety device for preventing automatic transmission of mechanical damage of projection welding machine welding nut. BACKGROUND

[0002] The nut projection welding machine is a device for welding nuts, which is widely used in the field of automobile manufacturing and is specially used for welding nuts on bodywork parts.

[0003] The nut projection welding machine is suitable for welding low-carbon steel and low-alloy steel stamping parts due to the concentration of current, which overcomes the defect of fusion core deviation during spot welding, can realize consistent welding position of all nuts, uniform, beautiful and firm welding strength, and does not damage the thread and reduce the thread accuracy, has the characteristics of short welding time, small heat-affected zone and high efficiency.

[0004] When welding the bodywork parts, the worker usually holds the bodywork parts and places them between the upper electrode head and the lower electrode head of the nut projection welding machine, places the nut on the welding position of the bodywork parts by hand, then steps on the switch to start the cylinder pressure mechanism, and drives the upper electrode head to move downward to pressurize the nut to realize welding. This manual nut placement method is prone to the phenomenon that the upper electrode head is pressed downward to pinch the fingers due to uncoordinated hands and feet, which has serious safety hazards and needs to be improved. UTILITY MODEL CONTENTS

[0005] In order to solve the above problems, the utility model provides a safety device for preventing automatic transmission of mechanical damage of projection welding machine welding nut.

[0006] The technical scheme of the utility model is: a safety device for preventing automatic transmission of mechanical damage of projection welding machine welding nut, which comprises an upper support and a lower support arranged at the front part of the machine body, the upper support is a lifting support, the lower support is a fixed seat, a cylinder pressure mechanism is arranged on the upper support, the cylinder pressure mechanism drives the upper support to move up and down, a piston rod of the cylinder pressure mechanism is provided with an upper electrode seat at the lower end, a lower electrode seat is arranged on the lower support, an upper electrode head is vertically arranged in the middle of the upper electrode seat, the lower part of the upper electrode head is bent outward to form an L-shaped electrode head, a lower electrode head opposite to the L-shaped electrode head is arranged at the outer end of the lower electrode seat, the lower electrode head is a cylindrical head, and a positioning boss is arranged at the center of the upper end face; a nut conveying mechanism is obliquely arranged on one side of the upper electrode seat through a support rod, the end part of the support rod is provided with a movable lock buckle, the nut conveying mechanism is connected with the movable lock buckle, and the height and the inclination angle of the nut conveying mechanism are adjusted through the movable lock buckle.

[0007] Preferably, the nut conveying mechanism comprises a cylindrical guide rail and a feeding support, a telescopic rod is slidably connected in the cylindrical guide rail, a limiting step is arranged at the lower end of the telescopic rod, the nut can be sleeved on the lower end of the telescopic rod, the size of the limiting step is larger than the inner diameter size of the nut, a feeding pipe is arranged at the upper end of the internal slide of the feeding support, the feeding pipe is a flexible plastic pipe, a square slot is arranged at the lower end of the internal slide, and the lower end of the telescopic rod is opposite to the center of the square slot.

[0008] Preferably, the square slot is provided with a baffle, the lower end of the baffle is hingedly connected to the lower part of the feeding support, a torsional spring for driving the baffle to rotate upward is arranged on the hinged shaft, the upper part of the baffle is provided with a U-shaped notch opposite to the square slot, the telescopic rod can be extended from the U-shaped notch, and the size of the U-shaped notch is smaller than the size of the square slot.

[0009] Preferably, the side of the piston rod of the air cylinder pressurizing mechanism is provided with a guide rod, the lower end of the guide rod and the piston rod are fixedly connected with the upper electrode base, the guide rod is located on the inner side of the piston rod, and the size of the guide rod is smaller than the size of the piston rod.

[0010] Preferably, the upper electrode base and the lower electrode base are connected with the welding power source in the machine body through copper plates.

[0011] Preferably, the upper copper plate connected with the upper electrode base is connected by laminating a plurality of thin copper plates and is bent upward to form an inverted U-shaped structure, the thin copper plates are thin enough to meet the requirement of bending deformation of the upper copper plate, and the lower copper plate connected with the lower electrode base is a fixedly connected long plate-shaped copper plate.

[0012] The beneficial technical effects of the utility model are:

[0013] (1) The upper electrode head of the utility model is designed as an L shape, the welding point is transferred from the position directly below the upper electrode base to the outer side, the line of sight is avoided from being blocked when the workpiece is welded with the nut, the safety of operation is improved, the workpiece can be accurately placed between the upper and lower electrode heads for welding, and the welding quality is improved.

[0014] (2) The nut is accurately placed on the lower electrode head by the telescopic rod in the nut conveying mechanism, the nut does not need to be placed at the welding position by hand, the phenomenon that the fingers are pinched by the upper electrode head due to uncoordinated hands and feet is avoided, and serious safety accidents are avoided. DRAWINGS

[0015] Figure 1 is the three-dimensional structure schematic diagram of the utility model;

[0016] Figure 2 is the front view structure schematic diagram of the utility model;

[0017] Figure 3is the schematic diagram of the three-dimensional structure of the nut conveying mechanism (baffle open);

[0018] Figure 4 is the schematic diagram of the three-dimensional structure of the nut conveying mechanism (baffle closed)

[0019] Figure 5 is the schematic diagram of the three-dimensional structure of the nut conveying mechanism (the nut is ejected and the baffle is automatically closed)

[0020] Figure 6 is Figure 5 the schematic diagram of the structure after the nut is removed in

[0021] Figures 7-8 is the actual photograph of the utility model.

[0022] In the figure, 11. body, 12. upper support, 13. lower support, 14. cylinder pressurizing mechanism, 15. piston rod, 16. guide rod, 17. upper electrode seat, 18. lower electrode seat, 19. L-shaped electrode head, 20. lower electrode head, 21. upper copper plate, 22. lower copper plate, 03. nut conveying mechanism, 31. cylindrical guide rail, 32. telescopic rod, 33. limiting step, 34. feeding support, 35. square groove, 36. feeding pipe, 37. baffle, 38. U-shaped notch, 39. torsional spring, 40. nut, 41. support rod. DETAILED DESCRIPTION

[0023] Example one, refer to the attached Figures 1-2 A safety device for preventing mechanical injury of a projection welding machine during welding of nuts, comprising an upper support 12 and a lower support 13 arranged at the front of the body 11, the upper support 12 is provided with a cylinder pressurizing mechanism 14, the lower end of the piston rod 15 of the cylinder pressurizing mechanism is provided with an upper electrode seat 17, the lower support 13 is provided with a lower electrode seat 18, the middle part of the upper electrode seat 17 is vertically provided with an upper electrode head, the lower part of the upper electrode head is outwardly bent to form an L-shaped electrode head 19, and the outer end of the lower electrode seat 18 is provided with a lower electrode head 20 opposite to the L-shaped electrode head 19; the L-shaped electrode head 19 shifts the welding point from the position directly below the upper electrode seat 17 to the outer side, avoids the line of sight from being blocked when the workpiece is welded with the nut 40, improves the safety of operation, and is beneficial to accurately placing the workpiece between the upper and lower electrode heads 20 for welding, thereby improving the welding quality.

[0024] The upper electrode seat 17 is obliquely installed with a nut conveying mechanism 03 on one side through a support rod 41, the piston rod 15 of the cylinder pressurizing mechanism 14 is provided with a guide rod 16 on one side, and the lower end of the guide rod 16 and the piston rod 15 are fixedly connected with the upper electrode seat 17; the guide rod is used to assist the extension and retraction of the piston rod, avoids the phenomenon that the piston rod 15 rotates due to the torsion generated during welding of the upper electrode seat 17, ensures the positional accuracy of the upper electrode head during use, and improves the welding quality.

[0025] The upper electrode base 17 and the lower electrode base 18 are connected to the welding power source inside the machine body 11 through copper plates. The upper copper plate 21 connected to the upper electrode base 17 is made of several thin copper plates stacked together and is bent upwards to form an inverted U-shaped structure. The upper copper plate of the structure can be elastically deformed and keeps the upper electrode head and the power source in the power-on state during the up-and-down movement of the cylinder pressurizing mechanism 14. The lower copper plate 22 connected to the lower electrode base 18 is a long plate-shaped copper plate fixedly connected.

[0026] Embodiment Two, see attached Figure 1 、 3 -6, which is basically the same as Embodiment One. The same parts are not described again. The difference is that the nut conveying mechanism 03 includes a cylindrical guide rail 31 and a feeding support 34. The telescopic rod 32 is slidably connected in the cylindrical guide rail 31. The cylindrical guide rail is provided with an air pipe. The telescopic rod 32 is driven to extend or retract by a pneumatic way. The lower end of the telescopic rod is provided with a limiting step 33. The upper end of the internal slide of the feeding support 34 is provided with a feeding pipe 36. The lower end of the internal slide is provided with a square groove 35. The nut 40 enters the internal slide of the feeding support 34 from the feeding pipe 36 and slides into the square groove 35. The lower end of the telescopic rod 32 is opposite to the center of the square groove 35.

[0027] The end of the square groove 35 is provided with a baffle 37. The lower end of the baffle is hinged to the lower part of the feeding support 34. A torsional spring 39 is arranged on the hinge shaft to drive the baffle 37 to rotate upwards. The baffle is driven by the torsional spring to block the nut 40 in the square groove 35. The upper part of the baffle 37 is provided with a U-shaped notch 38 opposite to the square groove 35. The size of the U-shaped notch 38 is smaller than that of the square groove 35, and the size of the U-shaped notch 38 is larger than the diameter of the telescopic rod 32.

[0028] When the nut conveying mechanism 03 works, the nut 40 enters the internal slide of the feeding support 34 from the feeding pipe 36 and slides into the square groove 35. The baffle 37 blocks the nut 40 in the square groove 35. The telescopic rod 32 in the cylindrical guide rail 31 is driven to extend outward. The outer end of the telescopic rod 32 enters the square groove 35 and is inserted into the middle hole of the nut 40. The limiting step 33 plays a role in limiting the axial position of the nut 40. The telescopic rod 32 takes the nut 40 and pushes the baffle 37 away from the square groove 35. After the nut 40 leaves the square groove 35, the baffle 37 is reset upwards under the action of the torsional spring 39. The U-shaped notch 38 avoids interference with the telescopic rod 32. The lower end of the telescopic rod 32 stops moving after approaching the lower electrode head 20. The nut 40 slides from the telescopic rod 32 and is sleeved onto the lower electrode head 20 by its own inertia. The automatic conveying of the nut 40 is completed. It is not necessary to place the nut 40 at the welding position by hand. The phenomenon that the upper electrode head presses down and injures the fingers due to uncoordinated hands and feet does not occur.

Claims

1. A safety device for preventing the automatic transmission of mechanical damage by a projection welding machine to a threaded cap, comprising an upper support and a lower support arranged at the front of the machine body, the upper support being provided with a cylinder pressurizing mechanism, the lower end of the piston rod of the cylinder pressurizing mechanism being provided with an upper electrode seat, the lower support being provided with a lower electrode seat, characterized in that: The upper electrode seat is vertically provided with an upper electrode head, the lower part of the upper electrode head is outwardly bent to form an L-shaped electrode head, the outer end of the lower electrode seat is provided with a lower electrode head which is opposite to the L-shaped electrode head; a nut conveying mechanism is obliquely installed on one side of the upper electrode seat through a supporting rod.

2. The safety device for preventing mechanical damage of the automatic transmission of the projection welding machine for welding the nut according to claim 1, characterized in that: The nut conveying mechanism comprises a cylindrical guide rail and a feeding support, a telescopic rod is slidably connected in the cylindrical guide rail, a limiting step is arranged at the lower end of the telescopic rod, a feeding pipe is arranged at the upper end of the internal slide of the feeding support, a square groove is arranged at the lower end of the internal slide, and the lower end of the telescopic rod is opposite to the center of the square groove.

3. The safety device for preventing the mechanical damage of the automatic transmission of the projection welding machine for welding the nut according to claim 2, characterized in that: A baffle is arranged at the port of the square groove, the lower end of the baffle is hingedly connected with the lower part of the feeding support, a torsion spring is arranged on the hinged shaft to drive the baffle to rotate upward, the upper part of the baffle is provided with a U-shaped notch which is opposite to the square groove, and the size of the U-shaped notch is smaller than the size of the square groove.

4. The safety device for preventing mechanical damage of the automatic transmission of the projection welding machine for welding the nut according to claim 1, characterized in that: A guide rod is arranged at one side of the piston rod of the air cylinder pressurizing mechanism, and the lower end of the guide rod and the piston rod are fixedly connected with the upper electrode seat.

5. The safety device for preventing mechanical damage of the automatic transmission of the projection welding machine for welding the nut according to claim 1, characterized in that: The upper electrode seat and the lower electrode seat are connected with the welding power source in the machine body through copper plates.

6. The safety device for preventing mechanical damage of the automatic transmission of the projection welding machine for welding the nut according to claim 1, characterized in that: The upper copper plate connected with the upper electrode seat is formed by laminating a plurality of thin copper plates, and is upwardly bent to form an inverted U-shaped structure, and the lower copper plate connected with the lower electrode seat is a fixedly connected long plate-shaped copper plate.

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