Welding protection device

Abstract

The utility model provides a welding protection device which comprises a water tank and a mounting table. The water tank defines a water containing space with an open upper side. The mounting table is arranged in the water tank and used for mounting a to-be-welded part, so that the to-be-welded part is soaked in water of the water tank to be welded, and cooling during welding is achieved. The mounting table is further configured to be mounted in the water tank in an up-down moving mode so that the height position of the mounting table can be adjusted, and then the depth of the to-be-welded part immersed in water is changed. According to the welding protection device, accurate adjustment of relevant protection parameters of the welding protection device is achieved, and targeted adjustment can be conducted on different parts to be welded.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a welding protection device. Background Art

[0002] Welding is a common production process. Many parts need to be assembled by welding, so the quality of welding has a great impact on product quality. High temperatures are inevitable during the welding process. Some parts have non-heat-resistant parts inside that cannot withstand high temperatures. Under high temperature conditions, they will deform adversely, affecting the normal use of the parts.

[0003] For example, a four-way valve is a common part of air conditioners. The four-way valve switches between the cooling and heating circuits in air conditioners. The sliding parts inside the four-way valve are made of PP. Therefore, the high temperature generated when the four-way valve is welded will cause the slider of the four-way valve to deform, affecting normal sliding and causing the four-way valve to malfunction.

[0004] To avoid the above problems, the traditional welding method is to directly put the welded parts into water to cool them down and then perform the welding process in water. However, technicians have found that although this method is relatively effective, it still has a certain defect rate. Utility Model Content

[0005] The purpose of the utility model is to provide a welding protection device which overcomes the above problems or at least partially solves the above problems, so as to reduce the defect rate in the welding process.

[0006] A further purpose of the utility model is to achieve accurate adjustment of relevant protection parameters of the welding protection device, so as to be able to carry out targeted adjustment for different parts to be welded.

[0007] In particular, the utility model provides a welding protection device, which comprises:

[0008] a water tank defining a water containing space with an upper side open; and

[0009] A mounting platform is arranged inside the water tank, and is used to mount the parts to be welded, so that the parts to be welded are immersed in the water of the water tank to be welded, thereby achieving temperature reduction during welding; and

[0010] The mounting platform is also configured to be mounted on the water tank in a manner that it can be moved up and down, so as to adjust the height position of the mounting platform and thereby change the depth of the workpiece to be welded immersed in water.

[0011] Optionally, the mounting platform can be mounted on the side wall of the water tank so as to be movably moved up and down.

[0012] Optionally, a track extending in an up-down direction is provided on the side wall of the water tank, and the mounting platform is mounted on the track so as to be movable up and down.

[0013] Optionally, a surface of the mounting platform facing the side wall is provided with a slide groove extending in an up-down direction; and

[0014] The track is a convex strip arranged on the side wall, which is inserted into the slide groove to allow the mounting platform to slide up and down along the track.

[0015] Optionally, the welding protection device further includes: a driving device, installed on the water tank, for driving the mounting platform to move up and down.

[0016] Optionally, the welding protection device further comprises:

[0017] A position sensor for detecting the current height of the mounting table;

[0018] A water level sensor, used to detect the height of the water surface in the water tank; and

[0019] The controller is electrically connected to the position sensor, the water level sensor and the driving device, and is used to control the operation of the driving device and adjust the height of the mounting table according to the position information detected by the position sensor and the water surface height, thereby changing the depth of the welded parts immersed in water.

[0020] Optionally, the welding protection device further comprises:

[0021] The temperature sensor is used to detect the water temperature in the water tank so that the operator can adjust the water temperature to keep it within a preset temperature range.

[0022] Optionally, the welding protection device further comprises:

[0023] A water inlet pipe, the water outlet end of which is connected to the inside of the water tank;

[0024] a water pump connected to the water inlet pipe and used to supply water to the inside of the water tank through the water inlet pipe; and

[0025] a drain portion, used to drain the water in the water tank in a controlled manner; and

[0026] The controller is also used to control the water pump and the drainage part in real time according to the water level, so as to keep the water level within a preset range, and adjust the water temperature in the water tank through the water supply and drainage of the water pump and the drainage part.

[0027] Optionally, the drainage part includes a drainage pipe connected to the water tank and a solenoid valve for controlling the on / off of the drainage pipe.

[0028] Optionally, a fixing portion for fixing the parts to be welded is provided on the mounting platform.

[0029] The welding protection device of the utility model comprises a water tank and a mounting platform. The water tank is used for holding water. The mounting platform is arranged inside the water tank and is used for mounting parts to be welded so that the parts to be welded are immersed in the water in the water tank for welding, thereby achieving temperature reduction during welding.

[0030] In addition, the inventors have found that different types of welded parts have optimal immersion depths. For example, for valves such as four-way valves, the optimal immersion depths of valves made of different materials are different, and copper four-way valves and steel four-way valves have different optimal immersion depths.

[0031] To this end, in the welding protection device of the present invention, the mounting platform is also configured to be mounted on the water tank in a movable manner up and down, so as to adjust the height of the mounting platform, thereby changing the depth of the welded parts immersed in water, so as to select the best immersion depth according to factors such as the material of the welded parts before welding, and then adjust the height of the mounting platform. It can be seen that the present invention realizes the precise adjustment of the relevant protection parameters of the welding protection device, and can make targeted adjustments to different welded parts.

[0032] Furthermore, the welding protection device of the utility model also includes a position sensor and a drive device, so as to realize accurate detection and accurate and automatic adjustment of the height position of the mounting table, making the user operation easier and providing a better experience.

[0033] Furthermore, the welding protection device of the utility model also includes a temperature sensor for detecting the water temperature in the water tank so that the operator can adjust the water temperature to keep it within a preset temperature range. The amount of water in the water tank can also be adjusted by a water pump and a drainage part, and the water temperature can be adjusted by adding or draining water to realize the automation of water temperature regulation.

[0034] Based on the detailed description of some specific embodiments of the present invention in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0036] Figure 1 It is a structural schematic diagram of a welding protection device according to an embodiment of the utility model;

[0037] Figure 2It is a schematic diagram of the matching structure of the mounting platform and the rail in the welding protection device according to one embodiment of the utility model;

[0038] Figure 3 is a schematic diagram of a driving mechanism in a welding protection device according to an embodiment of the utility model;

[0039] Figure 4 is a schematic diagram of a driving mechanism in a welding protection device according to another embodiment of the utility model;

[0040] Figure 5 It is a schematic block diagram of a welding protection device according to an embodiment of the utility model. DETAILED DESCRIPTION

[0041] Refer to the following Figures 1 to 5 The welding protection device according to the embodiment of the utility model is introduced.

[0042] In the description of this embodiment, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the utility model.

[0043] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, it is defined that the features "first", "second", etc. may explicitly or implicitly include at least one of the features, that is, include one or more of the features.

[0044] In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and other features may be further included.

[0045] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "coupled" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present utility model according to the specific circumstances.

[0046] Furthermore, in the description of this embodiment, a first feature being “above” or “below” a second feature may include the first and second features being in direct contact with each other, or the first and second features not being in direct contact with each other but being in contact with each other via another feature therebetween.

[0047] That is, in the description of this embodiment, the first feature being "above", "above", and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below", or "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] Unless otherwise defined, all terms (including technical terms and scientific terms) used in the description of the embodiments of the present invention have the same meanings as those commonly understood by ordinary technicians in the technical field to which the present application belongs.

[0049] The embodiment of the utility model provides a welding protection device 10. The welding protection device 10 is used to provide temperature reduction protection for the welded part 20 when the welded part 20 is welded.

[0050] Figure 1 1 is a schematic structural diagram of a welding protection device 10 according to an embodiment of the utility model. Figure 1 The dashed lines indicate the contours that cannot be observed from the angle shown.

[0051] like Figure 1 As shown, the welding protection device 10 according to the embodiment of the present invention may generally include a water tank 100 and a mounting platform 300 .

[0052] The water tank 100 defines a water containing space 101 with an open upper side, and the water containing space 101 is used to contain cooling water. The upper side of the water tank 100 is open so that the welded parts 20 can enter the water tank 100 easily.

[0053] In some embodiments, the water tank 100 may also be provided with a tank cover (not shown), which is used to close the upper opening of the water tank 100. When the welding protection device 10 is needed, for example, when it is not in use and needs to be stored, the tank cover can be closed. For example, the tank cover can be mounted on the water tank 100 in a rotating connection manner, or connected to the water tank 100 in a translational connection manner.

[0054] The mounting platform 300 is disposed inside the water tank 100. The mounting platform 300 is used to mount the welded parts 20 so that the welded parts 20 are immersed in the water of the water tank 100 for welding, thereby achieving cooling during welding and preventing the welded parts 20 from malfunctioning under the high temperature of welding. For example, the sliding parts inside the four-way valve are made of PP material, so the high temperature generated when the four-way valve is welded in the pipeline will cause the slider of the four-way valve to deform, affecting normal sliding and causing the four-way valve to malfunction.

[0055] Furthermore, in the embodiment of the present invention, the mounting platform 300 is also configured to be movably mounted on the water tank 100 up and down, so as to adjust the height position of the mounting platform 300 and thereby change the depth of the welded part 20 immersed in water (ie, the immersion depth).

[0056] The welding protection device 10 of the embodiment of the utility model has a water tank 100 and a mounting platform 300. The water tank 100 is used to hold water. The mounting platform 300 is arranged inside the water tank 100 and is used to mount the workpiece 20 to be welded, so that the workpiece 20 to be welded can be immersed in the water in the water tank 100 to be welded, thereby achieving cooling during welding and avoiding failure of the workpiece 20 to be welded under the high temperature of welding.

[0057] In addition, the inventors have found that different types of welded parts 20 have optimal immersion depths. For example, for valves such as four-way valves, valves made of different materials have different optimal immersion depths. Copper four-way valves and steel four-way valves have different optimal immersion depths. However, existing welding protection devices lack designs regarding immersion depth.

[0058] To this end, in the welding protection device 10 of the embodiment of the utility model, the mounting table 300 is also configured to be installed on the water tank 100 so as to be movable up and down, so as to adjust the height position of the mounting table 300, thereby changing the depth of immersion of the workpiece 20 to be welded in water, so as to select the optimal immersion depth according to factors such as the material of the workpiece 20 to be welded before welding, and then adjust the height position of the mounting table 300, and adjust the position of the mounting table 300 (that is, the position of the workpiece 20 to be welded) to the optimal immersion depth, so that the workpiece 20 to be welded can obtain the best welding effect and reduce the defective rate during the welding process.

[0059] In some embodiments of the present invention, Figure 1 As shown, the mounting platform 300 is mounted on the side wall 110 of the water tank 100 so as to be movable up and down.

[0060] In other embodiments of the present invention, an independent mounting structure may be provided in the water tank 100, and the mounting structure may be mounted on the bottom wall or other parts of the water tank. The mounting platform 300 may be mounted on the mounting structure so as to move up and down. The mounting structure may be a column extending upward from the bottom wall of the water tank 100, or a bracket, or other structures, which are all easily expandable by those skilled in the art and will not be described in detail here.

[0061] Further, in some embodiments of the present invention, for the solution that the mounting platform 300 is movably mounted on the side wall 110 of the water tank 100, a track 200 extending in the up-down direction may be further provided on the side wall 110 of the water tank 100, and the mounting platform 300 is movably mounted on the track 200. The function of the track 200 is to constrain the sliding track of the mounting platform 300 so that it can slide along the set direction of the track 200.

[0062] Figure 2 It is a schematic diagram of the matching structure of the mounting platform 300 and the track 200 in the welding protection device 10 according to an embodiment of the utility model.

[0063] For example Figure 2 As shown, the surface of the mounting platform 300 facing the side wall 110 can be provided with a slide groove 310 extending in the up-down direction. The track 200 is a convex strip provided on the side wall 110, and the convex strip is inserted into the slide groove 310 and can slide up and down along the slide groove 310 to allow the mounting platform 300 to slide up and down along the track 200. The convex strip can be installed on the side wall 110 by means of threaded connection, clamping, etc.

[0064] In other embodiments, the track 200 may be a slide groove opened on the side wall 110, and a protrusion may be provided on the surface of the mounting platform 300 facing the side wall 110, so that the protrusion can be slidably arranged in the slide groove to allow the mounting platform 300 to slide up and down along the track 200.

[0065] Figure 3 is a schematic diagram of a driving mechanism in a welding protection device 10 according to an embodiment of the utility model, Figure 4 Schematic diagram of a driving mechanism in a welding protection device 10 according to another embodiment of the present invention.

[0066] In some embodiments of the present invention, the welding protection device 10 relies on the operator to manually adjust the height position of the mounting platform 300. Before welding, the optimal immersion depth of the current welded workpiece 20 can be determined according to the welding manual, and then the height position of the mounting platform 300 can be adjusted accordingly. Of course, the mounting platform 300 is provided with a corresponding locking structure, such as a locking screw, so that after the mounting platform 300 is adjusted to a suitable position, the mounting platform 300 is locked to keep it stably in this position.

[0067] In other embodiments of the present invention, Figure 3 and Figure 4 As shown, the welding protection device 10 also includes driving devices 230 and 240. The driving devices 230 and 240 are installed on the water tank 100 to drive the mounting platform 300 to move up and down. The driving devices 230 and 240 drive the mounting platform 300 to move, which can simplify the operation of the operator and make the welding process more automated. At the same time, compared with the manual method, the movement of the driving devices 230 and 240 can also make the displacement of the mounting platform 300 more accurate and can be accurately adjusted to a set height position.

[0068] Specifically, Figure 3 As shown, the driving device 230 may include a rack-and-pinion mechanism, and the rack-and-pinion mechanism is used to convert the rotation of the motor into the translation movement of the mounting platform 300 .

[0069] Specifically, the driving device 230 includes a motor 231, a gear 232 and a rack 233. The motor 231 can rotate forward and reverse in a controlled manner. The gear 232 is mounted on the motor 231 and is used to rotate under the drive of the motor 231. The rack 233 extends in the up and down directions and is connected to the mounting platform 300. In addition, the rack 233 is meshed with the gear 232. When it is necessary to adjust the height position of the mounting platform 300, the motor 231 is turned on, so that the motor 231 drives the gear 232 to rotate, the gear 232 is meshed with the rack 233 to drive the rack 233 to translate up and down, and the rack 233 drives the mounting platform 300 to translate up and down.

[0070] Alternatively, the driving device 240 may include a belt transmission mechanism, which converts the rotation of the motor into the translation of the transmission belt, thereby driving the installation platform 300 to translate.

[0071] Specifically, Figure 4As shown, the driving device 240 may include a motor (not shown), two pulleys 241 spaced apart from each other, and the axes of the two pulleys 241 are parallel. The motor is used to drive one pulley 241 to rotate. The annular transmission belt 242 is stretched on the two pulleys 241. Obviously, the transmission belt 242 is an oblong at this time, with two straight sections and two arc sections. The mounting platform 300 is mounted on the straight section of the transmission belt 242. When the motor rotates forward or reversely, the transmission belt 242 is driven to move up and down, thereby driving the mounting platform 300 to move up and down.

[0072] Alternatively, the driving device may be a linear motor or other structure, and those skilled in the art may design it according to the needs, which will not be described in detail here.

[0073] The driving devices 230 and 240 may be installed on the side wall 110 of the water tank 100 and connected to a surface of the mounting platform 300 facing the side wall 110 or a surface adjacent to the surface.

[0074] Figure 5 It is a schematic block diagram of a welding protection device 10 according to an embodiment of the present utility model.

[0075] In some embodiments of the present invention, Figure 1 and Figure 5 As shown, the welding protection device 10 includes a position sensor 810 , a water level sensor 830 and a controller 900 .

[0076] The position sensor 810 is used to detect the current height of the mounting platform 300. Specifically, the current height is the height of the mounting platform 300 from the bottom wall of the water tank 100. Specifically, the height of the mounting platform 300 from the position sensor 810 can be directly detected, and then the height of the mounting platform 300 from the bottom wall of the water tank 100 can be calculated by combining the height of the position sensor 810 and the bottom wall of the water tank 100.

[0077] The water level sensor 830 is used to detect the water level in the water tank 100. The water level is the distance between the water surface and the bottom wall of the water tank 100.

[0078] The controller 900 is electrically connected to the position sensor 810, the water level sensor 830 and the driving devices 230 and 240, and is used to control the driving devices 230 and 240 to operate according to the position information detected by the position sensor 810 and the water surface height, adjust the height of the mounting table 300, and thus change the depth of the welded part 20 immersed in water. The immersion depth is equal to the water surface height minus the current height of the mounting table 300.

[0079] The embodiment of the utility model realizes accurate detection and accurate and automatic adjustment of the height position of the mounting platform 300 by providing a controller 900, a position sensor 810, a water level sensor 830 and drive devices 230, 240, making the user operation easier and providing a better experience.

[0080] In addition, the inventors have found that different types of welded parts 20 have optimal immersion depths. For example, for valves such as four-way valves, the optimal water temperatures of valves made of different materials are also different. Copper four-way valves and steel four-way valves have different optimal water temperatures.

[0081] To this end, in some embodiments of the present invention, Figure 1 and Figure 5 As shown, the welding protection device 10 further includes a water level sensor 830. The water level sensor 830 is used to detect the water temperature in the water tank 100 so that the operator can adjust the water temperature to keep it within a preset temperature range.

[0082] For example, in some embodiments, Figures 1 to 5 As shown, the welding protection device 10 further includes a water inlet pipe 500 , a water pump 600 and a drainage portion 700 .

[0083] The water inlet pipe 500 has a water outlet end connected to the inside of the water tank 100 and is used to inject water into the water tank 100.

[0084] The water pump 600 is connected to the water inlet pipe 500, and is used to supply water to the inside of the water tank 100 through the water inlet pipe 500. Of course, the water inlet of the water pump 600 is connected to a water source.

[0085] The drain portion 700 is used to drain the water in the water tank 100 in a controlled manner.

[0086] The controller 900 is also used to control the status of the water pump 600 and the drainage part 700 in real time according to the water level, so as to keep the water level within a preset range to prevent the water level from being too high and easily overflowing or too low and insufficient to play a cooling role.

[0087] In addition, another function of the controller 900 is to adjust the water temperature in the water tank 100 by controlling the water supply and drainage process of the water pump 600 and the drainage unit 700. That is, when the water temperature is high, the water temperature can be lowered by draining old water and supplying new water. Thus, the embodiment of the utility model realizes the automation of water temperature regulation, which not only simplifies the operation of the operator, but also avoids the water temperature being too high to affect the cooling effect, resulting in an increase in the welding defect rate.

[0088] In some embodiments of the present invention, Figure 1 As shown, the drainage unit 700 includes a drainage pipe 710 connected to the water tank 100 and a solenoid valve 720 for controlling the on and off of the drainage pipe 710 .

[0089] The drain pipe 710 is used to drain the water in the water tank 100. The solenoid valve 720 is installed on the drain pipe 710, and the solenoid valve 720 is electrically connected to the controller 900. When the solenoid valve 720 is controlled to open, the drain pipe 710 is conducted, allowing the water in the water tank 100 to be drained; when the solenoid valve 720 is controlled to close, the drain pipe 710 is blocked, and the water in the water tank 100 will not be drained. For the convenience of drainage, the drain pipe 710 is preferably installed at a position close to the bottom of the water tank 100.

[0090] In some embodiments of the present invention, as Figure 1 shown, a fixing portion 400 for fixing the workpiece to be welded 20 is provided on the mounting table 300. Under the action of the fixing portion 400, the position of the workpiece to be welded 20 remains stable during the welding process. The fixing portion 400 can fix the workpiece to be welded 20 by means of clamping, and the specific structure of the clamping is easy for those skilled in the art to design and will not be specifically introduced here.

[0091] Taking the four-way valves of two materials as an example, the usage method of the welding protection device 10 used for the four-way valves will be introduced below.

[0092] The two commonly used four-way valves are the Sv1 - copper four-way valve and the Sv2 - steel four-way valve respectively.

[0093] The corresponding sizes of the Sv1 - copper four-way valve and the Sv2 - steel four-way valve are Sm1 and Sm2 respectively;

[0094] The optimal immersion depths of the Sv1 - copper four-way valve and the Sv2 - steel four-way valve are h1 and h2 respectively;

[0095] The optimal water temperatures of the Sv1 - copper four-way valve and the Sv2 - steel four-way valve are that the water temperature of the Sv1 - copper four-way valve needs <t1, and the water temperature of the Sv2 - steel four-way valve needs <t2.

[0096] During welding, first fix the four-way valve on the fixing portion 400.

[0097] According to the model of the four-way valve, determine its optimal immersion depth.

[0098] According to the current height of the mounting table 300 detected by the position sensor 810, use the water level sensor 830 to detect the water surface height in the water tank 100.

[0099] Adjust the driving device to adjust the position of the four-way valve to the optimal immersion depth.

[0100] Obtain the real-time water temperature detected by the temperature sensor 820. When the water temperature is greater than or equal to the optimal water temperature (t1 or t2) of the current four-way valve, control the water pump 600 and the drainage portion 700 to perform water circulation to reduce the water temperature until the water temperature is less than t1 or t2.

[0101] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the contents disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

[0102] In the description of the present embodiment, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A welding protection device, characterized in that include: A water tank, which defines a water-containing space with an open upper side; as well as A mounting platform is arranged inside the water tank, and is used to mount the parts to be welded, so that the parts to be welded are immersed in the water of the water tank to be welded, thereby achieving temperature reduction during welding; and The mounting platform is also configured to be mounted on the water tank in a manner that it can be moved up and down, so as to adjust the height position of the mounting platform and thereby change the depth of the workpiece to be welded immersed in water.

2. The welding protection device according to claim 1, characterized in that: The mounting platform is mounted on the side wall of the water tank so as to be movable up and down.

3. The welding protection device according to claim 2, characterized in that: A track extending in an up-down direction is arranged on the side wall of the water tank, and the mounting platform is mounted on the track so as to be movable up and down.

4. The welding protection device according to claim 3, characterized in that: The surface of the mounting platform facing the side wall is provided with a slide groove extending in the up-down direction; and The track is a convex strip arranged on the side wall, which is inserted into the slide groove to allow the mounting platform to slide up and down along the track.

5. The welding protection device according to claim 1, characterized in that Also includes: A driving device is installed on the water tank to drive the mounting platform to move up and down.

6. The welding protection device according to claim 5, characterized in that Also includes: A position sensor for detecting the current height of the mounting table; A water level sensor, used for detecting the water level in the water tank; and The controller is electrically connected to the position sensor, the water level sensor and the driving device, and is used to control the operation of the driving device and adjust the height of the mounting table according to the position information detected by the position sensor and the water surface height, thereby changing the depth of the welded parts immersed in water.

7. The welding protection device according to claim 6, characterized in that Also includes: The temperature sensor is used to detect the water temperature in the water tank so that the operator can adjust the water temperature to keep it within a preset temperature range.

8. The welding protection device according to claim 7, characterized in that Also includes: A water inlet pipe, the water outlet end of which is connected to the inside of the water tank; A water pump connected to the water inlet pipe and used to supply water to the inside of the water tank through the water inlet pipe; and a drain portion, used to drain the water in the water tank in a controlled manner; and The controller is also used to control the water pump and the drainage part in real time according to the water level, so as to keep the water level within a preset range, and adjust the water temperature in the water tank through the water supply and drainage of the water pump and the drainage part.

9. The welding protection device according to claim 8, characterized in that: The drainage part includes a drainage pipe connected to the water tank and a solenoid valve for controlling the on and off of the drainage pipe.

10. The welding protection device according to claim 1, characterized in that: The mounting platform is provided with a fixing portion for fixing the parts to be welded.

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