Nut mistake proofing device

Abstract

A nut mistake proofing device comprises a holding rod, an electrode, an electrode cover, a positioning pin, an ejector rod, a spring, a moving rod, a sensor mounting frame, a non-contact displacement sensor and a protective cover, the electrode, the electrode cover, the positioning pin, the ejector rod, the spring and the moving rod are sequentially installed at the upper end of the holding rod, and the sensor mounting frame, the non-contact displacement sensor and the protective cover are sequentially installed at the lower end of the holding rod. The lower end of the moving rod extends into the non-contact displacement sensor, the lower end of the electrode is provided with an air nozzle with a throttle valve, the air nozzle is communicated with an inner cavity of the electrode, the inner cavity of the electrode is internally provided with a separation block which divides the inner cavity into a lower air inlet space and an upper air outlet space, and the separation block provides movement guide for the ejector rod and allows air to pass through. A mounting hole for placing the positioning pin is formed in the electrode cover; and a gap for guiding gas to blow to a nut placed on the positioning pin is formed between the positioning pin and the mounting hole.

Description

Technical Field

[0001] The utility model relates to the technical field of welding equipment, in particular to a nut anti-misalignment device. Background Art

[0002] For nut welding, usually there are convex points on one side. When welding, the side with convex points of the nut should be in contact with the plate. If the side with convex points of the nut faces away from the plate when placing the nut, the welding effect cannot be achieved. Therefore, in this case, that is, when the nut is placed in the reverse direction, the welding equipment should stop welding.

[0003] Publication (Announcement) Number: CN207695899U discloses a nut welding anti-misalignment instrument, which includes a fixed table and a control panel. A connecting wire is arranged on the lower outer surface of the fixed table. A cylinder is fixedly installed on the upper outer surface of the fixed table, and a throttle valve is arranged on one side of the cylinder. A grip rod base is fixedly installed at the upper end of the cylinder, and a cooling water inlet and outlet are arranged on the front outer surface of the grip rod base. An inner water-cooled electrode grip rod is fixedly installed at the upper end of the grip rod base. A lower nut electrode is fixedly installed at the upper end of the inner water-cooled electrode grip rod. A positioning pin penetrates through the inside of the inner water-cooled electrode grip rod. A high-precision displacement sensor and a detection mechanism are fixedly installed inside the fixed table, and the high-precision displacement sensor is located on one side of the detection mechanism. A nut is arranged at the upper end of the positioning pin. A workpiece is arranged on the upper outer surface of the lower nut electrode. An upper electrode is arranged above the nut. The control panel is fixedly connected to the fixed table through the connecting wire. A display screen is arranged at the center of the front outer surface of the control panel, and a switch knob, a power indicator light, an alarm indicator light and a reset button are arranged below the display screen. The switch knob and the power indicator light are located on one side of the alarm indicator light and the reset button. The switch knob is located on one side of the power indicator light, and the alarm indicator light is located on one side of the reset button. The detection mechanism, the power indicator light and the alarm indicator light are electrically connected to the display screen. This nut welding anti-misalignment instrument has a welding counting function, including welding point count, electrode exchange, production station count, positioning pin life count. The welding parameter table and specification number are displayed on the interface, which is convenient for confirming the welding conditions when changing workpieces, and has a selectable function of counting reset, but there are defects, that is, it cannot handle the welding slag generated during welding. The welding slag remaining on the welding surface will affect the surface finish, damage the appearance quality of the product, affect the aesthetics, and the welding slag remaining in the welding structure is likely to cause problems such as welding deformation and cracks, affecting the mechanical properties of the product, such as strength and toughness. Summary of the Utility Model

[0004] The utility model aims to solve the above-mentioned shortcomings of the prior art and provides a nut anti-misalignment device to solve the above problems.

[0005] The technical solution adopted by the utility model to solve its technical problems: This nut anti-misalignment device includes a grip rod, an electrode, an electrode cap, a positioning pin, a push rod, a spring, a moving rod, a sensor mounting bracket, a non-contact displacement sensor, and a shield. The upper end of the grip rod is successively fitted with the electrode, the electrode cap, the positioning pin, the push rod, the spring, and the moving rod. The lower end of the grip rod is successively fitted with the sensor mounting bracket, the non-contact displacement sensor, and the shield. The lower end of the moving rod extends into the non-contact displacement sensor. A nozzle with a throttle valve is provided at the lower end of the electrode, and the nozzle is communicated with the inner cavity of the electrode. A partition block that divides the inner cavity into a lower air inlet space and an upper air outlet space is provided in the inner cavity of the electrode. The partition block provides a moving guide for the push rod and allows gas to pass through. An installation hole for placing the positioning pin is provided in the electrode cap, and there is a gap between the positioning pin and the installation hole to guide the gas to blow on the nut placed on the positioning pin.

[0006] For further improvement, a moving channel that is located at the center position and provides a moving guide for the push rod, and air passage channels that are located outside the moving channel and are annularly arrayed with the center of the moving channel as the center are provided on the partition block. The air passage channels are communicated with the lower air inlet space and the upper air outlet space.

[0007] For further improvement, the installation hole on the electrode cap has a lower inlet and an upper outlet. The lower inlet is for placing the positioning pin that can move along the installation hole, and the upper outlet allows part of the positioning pin to extend outside the installation hole.

[0008] For further improvement, the installation hole has a straight section and a tapered section. The configuration of the positioning pin is consistent with that of the installation hole, so that the gap generated between the tapered section and the positioning pin can be gradually increased or decreased by moving.

[0009] For further improvement, the upper end surface of the positioning pin is set as a tapered surface and has an insertion part that extends upward for the nut to be inserted into. A stepped configuration is formed between the insertion part and the positioning pin by a dimensional difference.

[0010] For further improvement, a cooling water jacket is provided between the nozzle and the electrode cap on the electrode. A water passage cavity located at the center position and seal ring mounting cavities symmetrically distributed on both sides of the water passage cavity are provided in the cooling water jacket. Two water nozzles communicated with the water passage cavity are provided on the outer peripheral surface of the cooling water jacket. The seal ring mounting cavities are for placing the seal rings provided on the outer peripheral surface of the electrode.

[0011] The beneficial effects of the utility model are:

[0012] The utility model uses the nozzle provided on the electrode and connected to an external gas generating device to guide the gas into the inner cavity of the electrode, and a gap allowing gas to flow is formed between the positioning pin and the installation hole, so that the gas is ejected upward to timely blow away the welding slag generated by welding, and thus there will be no impact on aesthetics and mechanical properties. Description of the Drawings

[0013] Figure 1 is the structural schematic diagram of the present utility model;

[0014] Figure 2 is the half-sectional structural schematic diagram of the present utility model;

[0015] Figure 3 is the exploded structural schematic diagram of the electrode cap and the positioning pin of the present utility model;

[0016] Figure 4 is the structural schematic diagram of the cooling water jacket and the sealing ring of the present utility model. Specific embodiments

[0017] The present utility model will be further described below in conjunction with the accompanying drawings:

[0018] Referring to the accompanying drawings: This nut anti-misalignment device includes a grip rod 1, an electrode 2, an electrode cap 3, a positioning pin 4, a push rod 5, a spring 6, a moving rod 7, a sensor mounting bracket 8, a non-contact displacement sensor 9, and a shield 10. The upper end of the grip rod 1 is successively inserted with the electrode 2, the electrode cap 3, the positioning pin 4, the push rod 5, the spring 6, and the moving rod 7. The lower end of the grip rod 1 is successively inserted with the sensor mounting bracket 8, the non-contact displacement sensor 9, and the shield 10. The lower end of the moving rod 7 extends into the non-contact displacement sensor 9. A nozzle 20 with a throttle valve 201 is provided at the lower end of the electrode 2. The nozzle 20 is communicated with the inner cavity of the electrode 2. A partition block 23 that divides the inner cavity into a lower air inlet space 21 and an upper air outlet space 22 is provided in the inner cavity of the electrode 2. The partition block 23 provides a moving guide for the push rod 5 and allows gas to pass through. An installation hole 31 for placing the positioning pin 4 is provided in the electrode cap 3. There is a gap between the positioning pin 4 and the installation hole 31 to guide the gas to blow towards the nut placed on the positioning pin 4. The principle of the present utility model is that the nozzle 20 is used to connect with an external gas generating device to guide the gas into the inner cavity of the electrode 2. The partition block 23 can not only provide a moving guide for the push rod 5 to ensure the stability of the push rod 5 during movement, but also form the lower air inlet space 21 and the upper air outlet space 22 in the inner cavity of the electrode 2, and it also serves as a gas passage component itself, that is, the gas entering the lower air inlet space 21 reaches the upper air outlet space 22 through the partition block 23. The gas placed in the upper air outlet space 22 will enter the gap formed between the positioning pin 4 and the installation hole 31, and the gap guides the gas to move towards the nut placed on the positioning pin 4, thereby realizing timely blowing away of the welding slag generated during welding, so as not to affect the aesthetics and mechanical properties.

[0019] The separation block 23 is provided with a moving channel 23-1 located at the center position for guiding the movement of the ejector rod 5, and air passage channels 23-2 located outside the moving channel 23-1 and distributed in a circular array with the center of the moving channel 23-1 as the center. The air passage channels 23-2 communicate with the lower air inlet space 21 and the upper air outlet space 22. The moving channel 23-1 provides a guiding function for the movement of the ejector rod 5, and the air passage channels 23-2 enable the separation block 23 to allow gas to pass through. Moreover, the inner diameter of the air passage channels 23-2 is smaller than the inner diameter of the lower air inlet space 21. Then, when the gas enters from the large space into the small space, it will be squeezed, and the squeezing can increase the gas flow rate, so that the gas can quickly reach the upper air outlet space 22.

[0020] The mounting hole 31 on the electrode cap 3 has a lower inlet 31-1 and an upper outlet 31-2. The lower inlet 31-1 is provided with a positioning pin 4 that can move along the mounting hole 31, and the upper outlet 31-2 allows part of the positioning pin 4 to extend outside the mounting hole 31. The lower inlet 31-1 enables the positioning pin 4 to enter the mounting hole 31 from below, which can meet the requirement of its downward movement under pressure. The upper outlet 31-2 allows part of the positioning pin 4 to be exposed outside the electrode cap 3, and the exposed part is used to set the nut.

[0021] The mounting hole 31 has a straight section 31-3 and a tapered section 31-4. The configuration of the positioning pin 4 is consistent with the configuration of the mounting hole 31, so that the gap generated between the tapered section 31-4 and the positioning pin 4 can be gradually increased or decreased by moving. The tapered section 31-4 has a positioning function on the one hand, that is, it can quickly limit the final position of the positioning pin 4 in the mounting hole 31 and also limit the maximum value of the positioning pin 4 exposed outside the mounting hole 31.

[0022] The upper end surface of the positioning pin 4 is set as a tapered surface and has an insertion part 41 extending upward for the nut to be inserted into. The insertion part 41 forms a stepped configuration with the positioning pin 4 through a dimensional difference. The step formed between the insertion part 41 and the positioning pin 4 is obtained through a dimensional difference. In this way, when the nut is pressurized, the positioning pin 4 can move downward together with the nut. At this time, the downward displacement amount will be transmitted to the programmable processor in the control panel through a non-contact displacement sensor. The programmable processor will compare the displacement amount with the set value. When the displacement amount is not equal to the set value, the programmable processor will forcibly disconnect the power supply of the pressurizing cylinder of the welding machine and issue an alarm indication. When the displacement amount is equal to the set value, the instrument will be powered on for welding. The setting of the upper end surface of the positioning pin 4 as a tapered surface can obtain an inclined and guiding working surface. Moreover, after the positioning pin 4 descends, the tapered surface is located at the upper outlet 31-2. In this way, the gas comes out from the upper outlet 31-2 and is around the insertion part 41 and contacts the bottom surface of the nut. Then, the bottom surface of the nut is used to make the gas flow away from the insertion part 41 and clean the welding slag on the gas movement path and the welding slag of the nut itself. In this way, the action range of the gas is maximized.

[0023] A cooling water jacket 30 is provided between the gas nozzle 20 and the electrode cover 3 on the electrode 2. The cooling water jacket 30 has a water flow cavity 301 at the central position and sealing ring installation cavities 302 symmetrically distributed on both sides of the water flow cavity 301. Two water nozzles 303 communicating with the water flow cavity 301 are provided on the outer peripheral surface of the cooling water jacket 30. The sealing ring installation cavity 302 is for the sealing ring 40 provided on the outer peripheral surface of the electrode 2 to be placed therein. One water nozzle 303 is used for water inlet, and the other water nozzle 303 is used for water outlet, so that the cooling water in the cooling water jacket 30 can circulate. That is, the cooling effect of the cooling water is ensured by circulation, and the electrode 2 in the working state can be maintained at a normal working temperature, so that the electrode 2 can ensure long-term operation. The cooling water jacket 30 and the electrode 2 are hermetically connected through the sealing ring 40. In this way, while ensuring the setting stability of the cooling water jacket 30 on the electrode 2, water leakage from the cooling water jacket 30 can also be avoided.

[0024] Although the present utility model has been illustrated and described by reference to the preferred embodiments, those of ordinary skill in the art should understand that various changes in form and details may be made within the scope of the claims.

Claims

1. A nut anti-misoperation device, comprising a grip rod (1), an electrode (2), an electrode cover (3), a positioning pin (4), a push rod (5), a spring (6), a moving rod (7), a sensor mounting bracket (8), a non-contact displacement sensor (9), and a shield (10). The upper end of the grip rod (1) is sequentially fitted with the electrode (2), the electrode cover (3), the positioning pin (4), the push rod (5), the spring (6), and the moving rod (7). The lower end of the grip rod (1) is sequentially fitted with the sensor mounting bracket (8), the non-contact displacement sensor (9), and the shield (10). The lower end of the moving rod (7) extends into the non-contact displacement sensor (9). It is characterized in that: A nozzle (20) with a throttle valve (201) is provided at the lower end of the electrode (2). The nozzle (20) is communicated with the inner cavity of the electrode (2). A partition block (23) is arranged in the inner cavity of the electrode (2) to divide the inner cavity into a lower air inlet space (21) and an upper air outlet space (22). The partition block (23) provides moving guidance for the ejector rod (5) and allows gas to pass through. An installation hole (31) for placing the positioning pin (4) is arranged in the electrode cover (3). There is a gap between the positioning pin (4) and the installation hole (31) to guide the gas to blow towards the nut placed on the positioning pin (4).

2. The nut anti-misoperation device according to claim 1, wherein: A moving channel (23-1) located at the central position and providing moving guidance for the ejector rod (5), and air passage channels (23-2) located outside the moving channel (23-1) and distributed in a circular array with the center of the moving channel (23-1) as the center are arranged on the partition block (23). The air passage channels (23-) are communicated with the lower air inlet space (21) and the upper air outlet space (22).

3. The nut anti-misoperation device according to claim 1, characterized in that: The installation hole (31) has a lower inlet (31-1) and an upper outlet (31-2) on the electrode cover (3). The lower inlet (31-1) is for placing the positioning pin (4) that can move along the installation hole (31), and the upper outlet (31-2) allows part of the positioning pin (4) to extend outside the installation hole (31).

4. The nut anti-misoperation device according to claim 3, wherein: The installation hole (31) has a straight section (31-3) and a tapered section (31-4). The configuration of the positioning pin (4) is consistent with that of the installation hole (SO that the gap generated between the tapered section (31-4) and the positioning pin (4) can be gradually increased or decreased by moving.

5. The nut anti-misoperation device according to claim 4, characterized in that: The upper end surface of the positioning pin (4) is set as a tapered surface and has an insertion part (41) extending upward for the nut to be inserted into. A step configuration is formed between the insertion part (41) and the positioning pin (4) due to the dimensional difference.

6. The nut anti-misoperation device according to claim 1, wherein: A cooling water jacket (30) is arranged between the nozzle (20) and the electrode cover (3) on the electrode (2). A water passage cavity (301) is located at the central position and seal ring installation cavities (302) are symmetrically distributed on both sides of the water passage cavity (301) in the cooling water jacket (30). Two water nozzles (303) communicated with the water passage cavity (301) are arranged on the outer peripheral surface of the cooling water jacket (30). The seal ring installation cavities (302) are for placing the seal rings (40) arranged on the outer peripheral surface of the electrode (2).

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