Cooling device and method for universal electrode tip of suspension spot welding machine

Abstract

The invention discloses a cooling device and method for a universal electrode tip of a suspension spot welding machine, and the cooling device comprises an upper electrode arm and a lower electrode arm which are respectively connected with the suspension spot welding machine, an upper electrode tip fixedly connected to the end part of the upper electrode arm, a lower electrode tip fixedly connected to the end part of the lower electrode arm, and a universal movable electrode tip arranged at the end part of the lower electrode tip, the water cooling device further comprises an upper water channel formed in the upper electrode arm, a lower water channel formed in the lower electrode arm and a movable water cooling mechanism arranged on the universal movable electrode tip. The upper electrode tip, the lower electrode tip and the universal movable electrode tip can be fully cooled, the temperature of the electrode tips is reduced by 50% or above, oxidation and deformation of welding spots are reduced, the welding consistency is improved, the reject ratio is reduced by 30%, the service life of the electrode tips can be prolonged by 2-3 times through continuous cooling treatment, the annual maintenance cost is reduced by 40%, and the production efficiency is improved. The shutdown replacement time is shortened, the production efficiency is improved by 15%, the cooling medium can be recycled by the water cooling system, and no extra energy consumption is generated.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, in particular to a cooling device and method for a universal electrode head of a suspension spot welding machine. Background Art

[0002] The universal electrode head of the suspended spot welding machine is a multi-directional adjustable electrode device designed specifically for suspended spot welding machines. Its core function is to ensure that the electrode end face always fits the workpiece surface through flexible angle adjustment, thereby improving welding quality and efficiency. The universal electrode head consists of an electrode rod and an electrode cap, which are connected by a ball head or a universal joint, allowing the electrode cap to rotate freely within a certain range. It is suitable for welding needs at complex angles. During high-frequency welding, the universal electrode head generates a lot of heat due to continuous power contact with the workpiece.

[0003] The existing universal electrode head uses natural heat dissipation or air cooling to dissipate heat, which is inefficient and leads to temperature accumulation in the electrode head, oxidation of the welding part, poor surface quality (such as blackening and deformation of the weld), softening or burning of the electrode head material, significantly reduced service life (frequent replacement is required), poor welding stability, and the need for manual intervention and adjustment, which increases production costs.

[0004] An electrode cooling mechanism is disclosed in the patent document with the announcement number CN219805520U. The electrode cooling mechanism aims to solve the problem that the existing welding of parts in special parts cannot pass water due to space problems, which greatly reduces their service life and makes it impossible to use conventional materials such as chromium-copper as materials, which increases costs. The following solution is proposed, which includes an electrode head body and an electrode rod body, and also includes a matching groove, the matching groove is opened in the electrode head body, and the electrode rod body is arranged in the matching groove; a connecting component, the connecting component is arranged between the electrode head body and the electrode rod body to fix the electrode rod body in the matching groove; a water-cooling circulation part, the water-cooling circulation part is arranged between the electrode head body and the electrode rod body to cool the electrode rod body; it greatly increases the service life of the electrode rod body and reduces the cost, and also improves the quality of resistance welding, but the electrode cooling mechanism mainly performs water cooling on the electrode arm, and has a poor heat dissipation effect on the movable universal electrode head.

[0005] In order to solve the above-mentioned deficiencies in the prior art, it is a problem worthy of study to provide a cooling device and method for a universal electrode head of a suspension spot welding machine. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the existing universal electrode head that uses natural heat dissipation or air cooling to dissipate heat, which is inefficient and causes temperature accumulation in the electrode head. A cooling device and method for the universal electrode head of a suspension spot welding machine are provided to achieve the technical effect of rapid heat dissipation.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A cooling device for a universal electrode head of a suspension spot welding machine includes an upper electrode arm and a lower electrode arm respectively connected to the suspension spot welding machine, an upper electrode head fixedly connected to the end of the upper electrode arm, a lower electrode head fixedly connected to the end of the lower electrode arm, and a universal movable electrode head arranged at the end of the lower electrode head. The device also includes an upper water channel opened in the upper electrode arm, a lower water channel opened in the lower electrode arm, and a movable water cooling mechanism arranged on the universal movable electrode head.

[0009] The movable water cooling mechanism includes a movable water channel opened in the universal movable electrode head, a water inlet pipe arranged on one side of the universal movable electrode head, and a water outlet pipe arranged on the other side of the universal movable electrode head. Relative to the water channel arranged in the electrode arm, the water inlet pipe and the water outlet pipe can bend themselves to adapt to the movement of the universal movable electrode head, so that the universal movable electrode head can continuously adjust its own state to perform spot welding on the workpiece while maintaining water cooling.

[0010] The two sides of the movable water channel are respectively connected to the outside world, and the openings on both sides of the movable water channel are respectively assembled and connected with the water inlet pipe and the water outlet pipe through quick-release joints. The material of the water inlet pipe and the water outlet pipe is soft silicone rubber. The water inlet pipe and the water outlet pipe made of soft silicone rubber have good flexibility. During use, they can adjust their own state as the universal movable electrode head is adjusted, so that the universal movable electrode head can maintain a state of communication with the water inlet pipe and the water outlet pipe during use, so that the universal movable electrode head can maintain a cooling water supply state in any state, thereby cooling the universal movable electrode head.

[0011] A water circulation device is provided between the water inlet pipe and the water outlet pipe, and the water circulation device cools the high-temperature water discharged from the water outlet pipe. The water after absorbing heat through the water channel can be cooled in the water circulation device, so that the high-temperature water can be input into the water channel again from the water inlet pipe after cooling to absorb heat and cool the electrode head, thereby realizing the recycling of cooling water and reducing the waste of water resources.

[0012] The upper water channel and the lower water channel are both connected in parallel with the water inlet and outlet of the water circulation device, and cooling water can circulate in the upper water channel and the lower water channel to achieve cooling treatment for the upper electrode arm and the lower electrode arm.

[0013] The end of the water inlet pipe is externally connected to a filtering device, which filters the cooling water entering the active water channel to prevent water stains, impurities, etc. from accumulating in the water channel and causing blockage of the water channel.

[0014] The interior of the movable water channel is spiral, and the universal movable electrode head is made of copper alloy. The copper alloy electrode head has high thermal conductivity and can quickly conduct the heat generated during welding to the cooling water channel, avoiding local overheating, reducing thermal stress concentration, and preventing the electrode head from cracking due to large temperature gradient.

[0015] The end of the lower electrode head is spherical, and a spherical groove is provided at the bottom of the universal movable electrode head. The end ball of the lower electrode head is rollingly connected to the spherical groove of the universal movable electrode head. The universal movable electrode head can roll relative to the lower electrode head to achieve directional adjustment at various angles.

[0016] A method for cooling a universal electrode head of a suspension spot welding machine comprises the following steps:

[0017] Step 1: The cooling water is drawn from the water tank of the water circulation device by a water pump and filtered by a filter;

[0018] Step 2: The filtered cooling water is diverted by the diverter valve, and the three water flows enter the upper water channel, the lower water channel and the active water channel respectively, and the heat exchange cooling process is carried out on the electrode through these three electrode cooling channels;

[0019] Step 3: The remaining cooling water is used to cool the transformer through the transformer cooler;

[0020] Step 4: The high-temperature cooling water after heat exchange is input into the radiator, and the cooling and heat dissipation process is completed with the assistance of the cooling fan;

[0021] Step 5: During the cooling process, the temperature sensor monitors the cooling water's cooling status.

[0022] Step 6: When the cooling water temperature drops to the rated value, the PLC control unit controls the cooling water in the radiator to be transported back to the water tank, so as to realize the recycling of cooling water and continuously cool down the electrode head efficiently. This cooling method can fully cool down the upper electrode head, the lower electrode head and the universal movable electrode head, reduce the oxidation and deformation of the weld point, and improve the welding consistency.

[0023] Positive and beneficial effects: 1. The cooling device and method of the universal electrode head of the suspended spot welding machine can fully cool the upper electrode head, the lower electrode head and the universal movable electrode head, reducing the temperature of the electrode head by more than 50%, reducing the oxidation and deformation of the weld point, improving the welding consistency, and reducing the defective rate by 30%. Continuous cooling treatment can extend the life of the electrode head by 2-3 times, reduce the annual maintenance cost by 40%, reduce the downtime and replacement time, and improve production efficiency by 15%. The water cooling system can recycle the cooling medium without additional energy consumption.

[0024] 2. The cooling device and method of the universal electrode head of the suspended spot welding machine adopts a universal movable electrode head made of copper alloy. The copper alloy electrode head has high thermal conductivity and can quickly conduct the heat generated during welding to the cooling water channel, avoiding local overheating, reducing thermal stress concentration, and preventing the electrode head from cracking due to large temperature gradients. In addition, the copper alloy has high electrical conductivity, which can reduce resistance heat loss and improve welding efficiency. The uniform conductivity of the copper alloy can avoid local concentration of current on the surface of the electrode head, reducing weld spatter and cold welds.

[0025] 3. The cooling device and method of the universal electrode head of the suspended spot welding machine are characterized by opening a movable water channel inside the universal movable electrode head, and setting a water inlet pipe and a water outlet pipe to form a closed-loop cooling circuit. The cooling water flows through the core heating area of ​​the electrode head (such as the contact surface between the electrode cap and the workpiece) to achieve directional heat exchange. Compared with traditional external cooling or integral electrode arm cooling, this design can reduce the electrode head temperature by 50%-60%, significantly reducing the risk of softening or oxidation of the electrode head material. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the front structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0029] Figure 4 Flow chart of the method of the present invention.

[0030] In the figure: 1-upper electrode arm, 2-lower electrode arm, 3-upper electrode head, 4-lower electrode head, 5-universal movable electrode head, 6-upper water channel, 7-lower water channel, 8-movable water channel, 9-water inlet pipe, 10-water outlet pipe. DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0032] Example 1

[0033] like Figures 1 to 3As shown, a cooling device for a universal electrode head of a suspension spot welding machine includes an upper electrode arm 1 and a lower electrode arm 2 respectively connected to the suspension spot welding machines, an upper electrode head 3 fixedly connected to the end of the upper electrode arm 1, a lower electrode head 4 fixedly connected to the end of the lower electrode arm 2, and a universal movable electrode head 5 arranged at the end of the lower electrode head 4, and also includes an upper water channel 6 opened in the upper electrode arm 1, a lower water channel 7 opened in the lower electrode arm 2, and a movable water cooling mechanism arranged on the universal movable electrode head 5.

[0034] like Figures 1 to 2 As shown, the movable water cooling mechanism includes a movable water channel 8 opened in the universal movable electrode head 5, a water inlet pipe 9 arranged on one side of the universal movable electrode head 5, and a water outlet pipe 10 arranged on the other side of the universal movable electrode head 5. By opening the movable water channel 8 inside the universal movable electrode head 5 and arranging the water inlet pipe 9 and the water outlet pipe 10 to form a closed-loop cooling circuit, the cooling water flows through the core heating area of ​​the electrode head (such as the contact surface between the electrode cap and the workpiece) to achieve directional heat exchange. Compared with traditional external cooling or integral electrode arm cooling, this design can reduce the electrode head temperature by 50%-60%, significantly reducing the risk of softening or oxidation of the electrode head material, and relative to the water channel arranged in the electrode arm, the water inlet pipe 9 and the water outlet pipe 10 can bend themselves to adapt to the movement of the universal movable electrode head 5, so that the universal movable electrode head 5 can continuously adjust its own state to perform spot welding on the workpiece while maintaining water cooling.

[0035] like Figures 1 to 2 As shown, both sides of the movable water channel 8 are respectively connected to the outside world, and the openings on both sides of the movable water channel 8 are respectively connected to the water inlet pipe 9 and the water outlet pipe 10 through quick-release joints. The material of the water inlet pipe 9 and the water outlet pipe 10 is soft silicone rubber. By setting the material of the water inlet pipe 9 and the water outlet pipe 10 to soft silicone rubber, the temperature resistance range of silicone rubber is -60°C to 250°C, which can withstand the high temperature environment around the electrode head for a long time, and the water inlet pipe 9 and the water outlet pipe 10 made of soft silicone rubber have good flexibility. During use, they can adjust their own state as the universal movable electrode head 5 is adjusted, so that the universal movable electrode head 5 can maintain a state of communication with the water inlet pipe 9 and the water outlet pipe 10 during use, so that the universal movable electrode head 5 can maintain a cooling water supply state in any state, thereby cooling the universal movable electrode head 5;

[0036] Furthermore, the quick-release joints between the ends of the water inlet pipe 9 and the water outlet pipe 10 and the openings on both sides of the movable water channel 8 are steel ball locking joints or threaded interfaces. The steel ball locking joints achieve self-locking by pushing the steel balls through springs. When the male head is inserted into the female head, the steel balls roll to the grooves to complete the locking. It has the advantages of good sealing and fast and convenient assembly and disassembly, which makes it convenient to disassemble and replace the water inlet pipe 9 and the water outlet pipe 10, thereby cleaning the interior of the movable water pipe 8, the water inlet pipe 9 and the water outlet pipe 10, and avoiding water stains, particulate impurities, etc. that block the water channel and affect the cooling effect of the electrode head.

[0037] Example 2

[0038] A water circulation device is provided between the water inlet pipe 9 and the water outlet pipe 10. The water circulation device cools the high-temperature water discharged from the water outlet pipe 10. By providing the water circulation device between the water inlet pipe 9 and the water outlet pipe 10, the water after absorbing heat through the water channel can be cooled by the water circulation device. Thus, the high-temperature water can be fed back into the water channel from the water inlet pipe 9 to absorb heat and cool the electrode head after cooling, thereby realizing the recycling of cooling water and reducing the waste of water resources.

[0039] Furthermore, the water circulation device is equipped with a constant temperature device to keep the temperature of the treated cooling water at 20-30°C. The constant water temperature can ensure a consistent heat exchange rate and avoid sudden changes in heat load due to temperature fluctuations. The thermal expansion and contraction effects of components such as electrode heads and pipelines due to temperature fluctuations are significantly reduced, and the fatigue life of the material is extended. In the welding process, the temperature of the electrode head directly affects the formation of the molten core. The constant temperature cooling water ensures that the electrode head is always at the optimal working temperature (such as 120-150°C), and the defective solder joint rate is reduced from 5% to below 1%.

[0040] The upper water channel 6 and the lower water channel 8 are both connected in parallel with the water inlet and outlet of the water circulation device. By connecting the upper water channel 6 and the lower water channel 8 to the water circulation device respectively, the cooling water can circulate in the upper water channel 6 and the lower water channel 8 to achieve cooling treatment of the upper electrode arm 1 and the lower electrode arm 2.

[0041] like Figure 4 As shown, the end of the water inlet pipe 9 is externally connected to a filter device. The filter device is provided on the water inlet pipe 9 to filter the cooling water entering the active water channel 9 to prevent water stains, impurities, etc. from accumulating in the water channel and causing blockage of the water channel.

[0042] Furthermore, a filtering device is also provided at the water inlet of the upper water channel 6 and the lower water channel 8, or a filtering device is directly provided at the water outlet of the water circulation device to comprehensively filter the cooling water flowing into the water channel to avoid the accumulation of impurities inside the water channel and pipeline affecting the water circulation.

[0043] Example 3

[0044] The interior of the movable water channel 8 is spiral, and the material of the universal movable electrode head 5 is copper alloy. By adopting the universal movable electrode head 5 made of copper alloy, the copper alloy electrode head has high thermal conductivity and can quickly conduct the heat generated during welding to the cooling water channel, avoiding local overheating, reducing thermal stress concentration, and avoiding cracking of the electrode head due to large temperature gradient. In addition, copper alloy has high conductivity, which can reduce resistance heat loss and improve welding efficiency. The uniformity of copper alloy conductivity can avoid local concentration of current on the surface of the electrode head, reducing weld spatter and cold welding.

[0045] Example 4

[0046] like Figure 3 As shown, the end of the lower electrode head 4 is spherical, and a spherical groove is provided at the bottom of the universal movable electrode head 5. The end ball of the lower electrode head 4 is rollingly connected to the spherical groove of the universal movable electrode head 5. By providing a mutually rolling spherical assembly structure between the lower electrode head 4 and the universal movable electrode head 5, the universal movable electrode head 5 can roll relative to the lower electrode head 4 to achieve directional adjustment at various angles.

[0047] like Figure 4 As shown, a cooling method for a universal electrode head of a suspension spot welding machine includes the following steps:

[0048] Step 1: The water pump draws cooling water from the water tank of the water circulation device and filters the cooling water through the filter:

[0049] Step 2: The filtered cooling water is diverted by the diverter valve, and the three water flows enter the upper water channel 6, the lower water channel 7 and the movable water channel 8 respectively, and the heat exchange cooling process of the electrode is carried out through these three electrode cooling channels;

[0050] Step 3: The remaining cooling water is used to cool the transformer through the transformer cooler;

[0051] Step 4: The high-temperature cooling water after heat exchange is input into the radiator, and the cooling and heat dissipation process is completed with the assistance of the cooling fan;

[0052] Step 5: During the cooling process, the temperature sensor monitors the cooling water's cooling status.

[0053] Step 6: When the cooling water temperature drops to the rated value, the PLC control unit controls the cooling water in the radiator to be transported back to the water tank to realize the recycling of cooling water and continuously cool down the electrode head for efficient treatment. This cooling method can fully cool down the upper electrode head 3, the lower electrode head 4 and the universal movable electrode head 5. The temperature of the electrode head is reduced by more than 50%, the oxidation and deformation of the weld point are reduced, the welding consistency is improved, and the defective rate is reduced by 30%. Continuous cooling treatment can extend the life of the electrode head by 2-3 times, reduce the annual maintenance cost by 40%, reduce the downtime and replacement time, and increase production efficiency by 15%. In addition, the water cooling system can recycle the cooling medium without additional energy consumption.

[0054] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A cooling device for a universal electrode tip of a suspension spot welding machine, comprising an upper electrode arm (1) and a lower electrode arm (2) respectively connected to the suspension spot welding machine, an upper electrode tip (3) fixedly connected to the end of the upper electrode arm (1), a lower electrode tip (4) fixedly connected to the end of the lower electrode arm (2), and a universal movable electrode tip (5) arranged at the end of the lower electrode tip (4), characterized in that: It also includes an upper water channel (6) opened in the upper electrode arm (1), a lower water channel (7) opened in the lower electrode arm (2), and a movable water cooling mechanism arranged on the universal movable electrode head (5).

2. The cooling device for a universal electrode tip of a suspension spot welding machine according to claim 1, characterized in that: The movable water cooling mechanism comprises a movable water channel (8) opened in the universal movable electrode head (5), a water inlet pipe (9) arranged on one side of the universal movable electrode head (5), and a water outlet pipe (10) arranged on the other side of the universal movable electrode head (5).

3. The cooling device for the universal electrode tip of a suspension spot welding machine according to claim 2, characterized in that: Both sides of the movable water channel (8) are respectively connected to the outside world, and the openings on both sides of the movable water channel (8) are respectively assembled and connected to the water inlet pipe (9) and the water outlet pipe (10) through quick-release joints. The material of the water inlet pipe (9) and the water outlet pipe (10) is soft silicone rubber.

4. The cooling device for a universal electrode tip of a suspension spot welding machine according to claim 3, characterized in that: A water circulation device is provided between the water inlet pipe (9) and the water outlet pipe (10), and the water circulation device cools the high-temperature water discharged from the water outlet pipe (10).

5. The cooling device for the universal electrode tip of a suspension spot welding machine according to claim 4, characterized in that: The upper water channel (6) and the lower water channel (8) are both connected in parallel with the water inlet and outlet of the water circulation device.

6. The cooling device for the universal electrode tip of a suspension spot welding machine according to claim 5, characterized in that: The end of the water inlet pipe (9) is externally connected to a filtering device.

7. The cooling device for a universal electrode tip of a suspension spot welding machine according to claim 2, characterized in that: The interior of the movable water channel (8) is spiral-shaped, and the universal movable electrode head (5) is made of copper alloy.

8. The cooling device for a universal electrode tip of a suspension spot welding machine according to claim 1, characterized in that: The end of the lower electrode head (4) is spherical, and a spherical groove is provided at the bottom of the universal movable electrode head (5). The end ball of the lower electrode head (4) is rollingly connected to the spherical groove of the universal movable electrode head (5).

9. A cooling method for a universal electrode tip of a suspension spot welding machine according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: The cooling water is drawn from the water tank of the water circulation device by a water pump and filtered by a filter; Step 2: The filtered cooling water is diverted by the diverter valve, and the three water flows enter the upper water channel (6), the lower water channel (7) and the movable water channel (8) respectively, and the heat exchange cooling process is carried out on the electrode through these three electrode cooling channels; Step 3: The remaining cooling water is used to cool the transformer through the transformer cooler; Step 4: The high-temperature cooling water after heat exchange is input into the radiator, and the cooling and heat dissipation process is completed with the assistance of the cooling fan; Step 5: During the cooling process, the temperature sensor monitors the cooling water's cooling status. Step 6: When the cooling water temperature drops to the rated value, the PLC control unit controls the cooling water in the radiator to be transported back to the water tank, realizing the recycling of cooling water and continuously cooling the electrode head efficiently.

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