A welding device for centrifugal pump production

Abstract

The present invention relates to the technical field of centrifugal pump production, and specifically to a welding device for centrifugal pump production, comprising a welding table, on which a plasma arc welding gun is installed through a mechanical arm, and further comprising a heat-conducting airbag, a knocking assembly and an auxiliary feeding assembly. The heat-conducting airbag is provided with carbon dioxide gas that expands when heated, and the side walls of the blade insertion groove are provided with airbag grooves, and heating plates are provided at the bottom end and inner side walls of the airbag grooves. The knocking assembly is used to hammer the welds when the plasma arc welding gun moves along the auxiliary grooves to weld blades and blade disks. The present invention provides a heat-conducting airbag, etc., wherein carbon dioxide that expands when heated is provided in the heat-conducting airbag. After the carbon dioxide is heated, its volume expands, and the heat-conducting airbag can fit the blades to be welded. The carbon dioxide with temperature conducts heat to the blades through the heat-conducting airbag, which can preheat the blades, improve the weldability of the blades, and reduce the generation of cracks.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pump production, in particular to a welding device for centrifugal pump production. Background Art

[0002] A centrifugal pump is a common fluid conveying equipment. It converts mechanical energy into pressure energy and kinetic energy of the fluid through a rotating impeller, thereby achieving liquid transportation. Among them, the centrifugal pump impeller is an important component of the centrifugal pump and plays a key role. As one of the core components of the centrifugal pump, the impeller needs to weld the blades and impeller discs together during the processing.

[0003] At present, during the welding process of the impeller, due to the uneven shrinkage of the weld, the impeller is easily deformed as a whole or in part, affecting the dynamic balance and assembly accuracy of the impeller. For example, when the blades of the impeller are welded to the impeller disk, the deformation of the weld angle will cause the blades to be skewed or even eccentric. To address this, the impeller is currently rigidly fixed during the welding process to limit its deformation, but rigid fixation will lead to an increase in residual stress. The residual stress generated during the welding process will reduce the fatigue strength and service life of the impeller, and may also cause cracks in the weld, as well as cracks and deformation of the impeller during operation. Secondly, before the current impeller impeller disk is welded, the pre-welding preparation work used mainly relies on manual operation. Specifically, the staff needs to insert the blades to be welded into the blade positioning grooves one by one, and ensure that the blades are in the correct position and then press and fix them to ensure the accuracy of the subsequent welding process. This operation method has many inconveniences. First, the manual insertion of blades one by one is extremely tedious, not only consuming a significant amount of time and labor costs, but also prone to fatigue and operational errors during repeated operations, which in turn affects product quality and production efficiency. Second, the consistency of manual operation is difficult to ensure, as different workers may have different operating techniques and strength, which will also have a certain impact on the installation accuracy of the blades, and ultimately lead to unstable overall performance of the impeller disk. To this end, we propose a welding device for centrifugal pump production. Summary of the Invention

[0004] To solve the above technical problems, an embodiment of the present application provides a welding device for centrifugal pump production, comprising a welding table, on which a plasma arc welding gun is mounted via a robotic arm, and a welding seat is fixed near the middle of the upper end surface of the welding table, wherein the welding seat is provided with a plurality of blade insertion slots in an annular array, and a movable welding auxiliary plate is provided above the welding seat, wherein the welding auxiliary plate is provided with auxiliary slots corresponding to the blade insertion slots, and further comprising:

[0005] Multiple heat-conducting airbags, each of which contains carbon dioxide gas that expands when heated. The side walls of the blade insertion slots are provided with airbag slots, each of which corresponds to a heat-conducting airbag, and heating plates are provided at the bottom and inner side walls of the airbag slots;

[0006] A striking assembly is mounted at the end of the robot arm and is located behind the plasma arc welding gun in the welding direction, and is used to hammer the weld seam when the plasma arc welding gun moves along the auxiliary slot to weld the blades and blisks;

[0007] The auxiliary loading assembly includes a fixed placement column and a movable placement column arranged up and down and provided with a plurality of blade storage slots in an annular array. A blade adjustment member is provided in the fixed placement column, and the blade adjustment member is used to gradually release the blades in the fixed placement column so that multiple blades can be fed into the movable placement column at the same time. A blade movable support is provided in the movable placement column.

[0008] The moving assembly is used to realize the movement of the movable placement column so that the movable placement column moves to above the welding seat and releases multiple blades into the blade insertion slots at the same time through the blade movable support.

[0009] In some embodiments, the knocking assembly includes a vertical bar fixed on the robotic arm, a first motor is installed on the upper end of the vertical bar facing the robotic arm, a first hinge bar on the other side of the vertical bar is installed at the output end of the first motor, the end of the first hinge bar is hinged to the second hinge bar, a guide block is fixed at the bottom end of the vertical bar on one side of the first hinge bar, a vertical knocking rod is passed through the guide block, the top end of the knocking rod is connected to a connecting rod, a universal ball is connected between the connecting rod and the second hinge bar, and a round head is fixed to the bottom end of the knocking rod.

[0010] In some embodiments, the heating plate at the bottom of the airbag groove is a circular structure, and the heating plate on the side wall of the airbag groove is an arc structure.

[0011] In some embodiments, the blade adjustment member includes a fourth motor installed in the middle of the top of the fixed placement column, the output end of the fourth motor is connected to a vertical first connecting shaft, and the outside of the first connecting shaft is installed with three layers of blocking members distributed up and down.

[0012] In some embodiments, three first grooves are vertically and equidistantly provided on the side walls of the blade storage slot in the fixed placement column, each of the first grooves corresponds to a layer of blocking members, and the three first grooves divide the blade storage slot in the fixed placement column into a loading area, an intermediate temporary storage area, and a bottom transfer area from top to bottom. The blocking members of the uppermost and lowermost layers are on the same vertical plane, and the blocking members of the uppermost and middle layers are staggered.

[0013] In some embodiments, each layer of the blocking member includes a connected arc-shaped rod and a first arc-shaped supporting bar, and one end of the arc-shaped rod away from the first arc-shaped supporting bar is fixed to the first connecting shaft.

[0014] In some embodiments, the blade movable support includes a fifth motor installed in the middle of the top inside the movable placement column, the output end of the fifth motor is connected to a second connecting shaft, and the bottom end of the outer wall of the second connecting shaft is installed with a plurality of second arc-shaped support strips in a circular array. A second groove is provided at the bottom end of the side wall of the blade storage slot in the movable placement column, and the second arc-shaped support strip can enter or exit the second groove.

[0015] In some embodiments, a drive assembly connected to the welding auxiliary plate is further included, and the drive assembly includes a mounting hoop and a mounting seat, the mounting hoop is fixed to the outside of the welding auxiliary plate, the mounting seat is arranged in the welding table, and a vertical second motor is installed on the mounting seat, the top of the second motor and the mounting hoop are connected by an axis, and a telescopic rod is installed between the mounting seat and the top of the inside of the welding table.

[0016] In some embodiments, the moving component includes a third motor installed on one side of the upper end surface of the welding table, and a screw is installed at the output end of the third motor. The outside of the screw is connected to the mounting sleeve outside the movable placement column through a screw nut seat.

[0017] In some embodiments, a protrusion is fixed in the middle of the upper end surface of the welding seat, and a positioning groove is provided in the middle of the lower end surface of the welding auxiliary plate.

[0018] The present invention has at least the following beneficial effects:

[0019] 1. Reduce the occurrence of cracks: Set up a thermal conductive airbag, etc., which is equipped with carbon dioxide that expands when heated. When the carbon dioxide is heated, its volume expands, and the thermal conductive airbag can fit the blades to be welded. The heated carbon dioxide transfers heat to the blades through the thermal conductive airbag, which can preheat the blades, improve the weldability of the blades, and reduce the occurrence of cracks; secondly, since the thermal conductive airbag has a certain elasticity, if the impeller is slightly disturbed by external force or thermal deformation during the welding process, the airbag can act as a buffer.

[0020] 2. Eliminate welding stress and improve weld performance: The robotic arm is equipped with a follow-up striking structure. The bottom end of the striking rod with a round head is fixed into the auxiliary groove, which can hammer the weld to create pits on the weld to eliminate some stress and change tensile stress into compressive stress. Secondly, the vibration stress generated by the striking can also relax and equalize the residual stress of the welding, further improving the dimensional stability and fatigue strength of the impeller.

[0021] 3. Improve production capacity: Through the blade adjustment part, there can always be two layers of blades to be welded on the fixed placement column. Through the cooperation of auxiliary loading components, continuous loading and welding can be achieved. There is no need to wait for the staff to finish loading after one set of welding is completed before welding, which greatly improves the welding efficiency.

[0022] 4. Improve welding quality: The blade disk and the blade inserted into the blade insertion slot can be pressed down synchronously. This downward pressure can make the fit between the blade and the blade disk tighter. The synchronous downward pressure can also help the blade and the blade disk to be accurately positioned before welding, and can ensure that multiple blades can be inserted into place. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 For the present invention Figure 1 Schematic diagram of the structure from another perspective;

[0025] Figure 3 It is a structural schematic diagram of the knocking assembly of the present invention;

[0026] Figure 4 For the present invention Figure 3 A schematic diagram of the structure from another perspective;

[0027] Figure 5 It is a structural schematic diagram of the welding seat of the present invention;

[0028] Figure 6 It is a schematic diagram of the longitudinal cross-sectional structure of the welding seat of the present invention;

[0029] Figure 7 This is a schematic diagram of the cross-sectional structure of the welding seat of the present invention;

[0030] Figure 8 It is a structural schematic diagram of the drive assembly of the present invention;

[0031] Figure 9 This is a schematic cross-sectional view of the auxiliary loading assembly of the present invention;

[0032] Figure 10 This is a schematic diagram of the explosion structure of the auxiliary feeding assembly of the present invention;

[0033] Figure 11 It is a structural schematic diagram of the blade adjustment member of the present invention.

[0034] In the figure: 1- welding table; 2- plasma arc welding gun;

[0035] 3- striking assembly; 31- vertical bar; 32- first motor; 33- first hinge bar; 34- second hinge bar; 35- guide block; 36- striking rod; 37- connecting rod; 38- universal ball joint;

[0036] 4-welding seat; 41-airbag groove; 42-bump;

[0037] 5-Welding auxiliary plate;

[0038] 6-drive assembly; 61-mounting hoop; 62-mounting seat; 63-second motor; 64-telescopic rod;

[0039] 7- auxiliary loading assembly; 71- fixed placement column; 711- first groove; 712- loading area; 713- intermediate temporary storage area; 714- bottom transfer area; 72- movable placement column; 721- second groove;

[0040] 8-moving assembly; 81-third motor; 82-lead screw;

[0041] 9-blade insertion slot; 10-heat-conducting airbag; 11-heating plate; 12-blade storage slot;

[0042] 13-blade adjustment member; 131-fourth motor; 132-first connecting shaft; 133-blocking member; 1331-arc-shaped rod; 1332-first arc-shaped support bar;

[0043] 14-blade movable support; 141-fifth motor; 142-second connecting shaft; 143-second arc-shaped support bar. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] Example 1: Please refer to Figure 1-Figure 7As shown, the present invention provides a technical solution: a welding device for centrifugal pump production, comprising a welding table 1, a plasma arc welding gun 2 is mounted on the welding table 1 through a mechanical arm, and a welding seat 4 is fixed near the middle of the upper end surface of the welding table 1, and a plurality of blade insertion slots 9 are arranged in a circular array on the welding seat 4. The number and layout of the blade insertion slots 9 are the same as the number and layout of the blades on the blade disk to be welded, and a movable welding auxiliary plate 5 is provided above the welding seat 4, and the welding auxiliary plate 5 is provided with auxiliary slots corresponding to the blade insertion slots 9. During welding, the plasma The welding end of the arc welding gun 2 moves along the auxiliary groove by the mechanical arm to improve the accuracy of the welding position. It also includes a knocking component 3 and a plurality of heat-conducting airbags 10. Carbon dioxide gas that expands when heated is provided inside the heat-conducting airbag 10. It can also be replaced with other inert gases that are easy to expand when heated and easy to shrink when cooled. The side wall of the blade insertion groove 9 is provided with an airbag groove 41. Each airbag groove 41 corresponds to a heat-conducting airbag 10. The heat-conducting airbag 10 is a device that uses the thermal conductivity of gas to achieve heat transfer. The heat-conducting airbag 10 can be made of polyimide ( PI) or other materials with good sealing performance, high temperature resistance and wear resistance, so that the heat-conducting airbag 10 not only has good sealing performance, but also can maintain stable physical properties in a high temperature environment to prevent gas leakage, and a heating plate 11 is provided at the bottom end and inner wall of the airbag groove 41. The heating plate 11 contains a resistance wire inside. When current passes through the resistance wire, according to Joule's law, the resistance wire will generate heat. Among them, the heating plate 11 at the bottom end of the airbag groove 41 is a circular structure, and the heating plate 11 on the side wall of the airbag groove 41 is an arc structure. The heating of the arc structure The plate 11 can increase the contact area between the side and the thermally conductive airbag 10, so that when the heating plate 11 is heated, the carbon dioxide gas inside the thermally conductive airbag 10 can be quickly heated and expanded, and then the hot thermally conductive airbag 10 is used to press the blades to preheat and clamp the blades. The knocking component 3 is installed at the end of the robot arm and is located on the rear side of the welding direction of the plasma arc welding gun 2. The knocking component 3 is used to hammer the weld during the process of the plasma arc welding gun 2 moving the blades and blade disks according to the auxiliary groove, so that the weld metal undergoes plastic deformation, thereby releasing residual stress.

[0046] Among them, combined Figure 3 and Figure 4 As shown, the knocking assembly 3 includes a vertical bar 31 fixed on the robotic arm, a first motor 32 is installed at the upper end of the vertical bar 31 facing the robotic arm, a first hinge bar 33 on the other side of the vertical bar 31 is installed at the output end of the first motor 32, and the end of the first hinge bar 33 is hinged to the second hinge bar 34, a guide block 35 is fixed at the bottom end of the vertical bar 31 on one side of the first hinge bar 33, a vertical knocking rod 36 is passed through the guide block 35, the top of the knocking rod 36 is connected to a connecting rod 37, a universal ball 38 is connected between the connecting rod 37 and the second hinge bar 34, and a round head is fixed to the bottom end of the knocking rod 36.

[0047] Through the above, during specific use, after the blades of the centrifugal pump impeller are inserted into the blade insertion slots 9, the staff can promptly use the controller (not shown) to start the heating plate 11 for heating. After the carbon dioxide is heated, its volume expands, allowing the heat-conducting airbag 10 to fit the blades to be welded. The heated carbon dioxide transfers heat to the blades through the heat-conducting airbag 10, which can preheat the blades, improve the weldability of the blades, and reduce the generation of cracks; and the heat-conducting airbag 10 has a certain elasticity. If the impeller is subjected to slight external force interference or thermal deformation during the welding process, the heat-conducting airbag 10 can play a role of buffering protection.

[0048] Secondly, when the robot arm drives the plasma arc welding gun 2 to move along the auxiliary groove for welding, the first motor 32 can be started, and the output end of the first motor 32 can be used to drive the first hinge bar 33 to rotate, and then the second hinge bar 34 can be driven to move, so that the knocking rod 36 can be extended and retracted along the guide block 35. When extending downward, the bottom end of the knocking rod 36 with a round head fixed enters the auxiliary groove, and the weld after welding can be hammered to form pits on the weld to eliminate part of the stress and change the tensile stress into compressive stress; secondly, the vibration stress generated by the knocking also relaxes and equalizes the residual stress of the welding, further improving the dimensional stability and fatigue strength of the impeller.

[0049] Among them, pits are arranged on the surface of the weld after hammering. This process actually converts the tensile stress on the weld surface into compressive stress. When the impeller is working, the compressive stress on the surface can partially offset the tensile stress applied externally, thereby improving the fatigue resistance of the weld.

[0050] In addition, it should be noted that since the knocking rod 36 is at a certain distance from the welding end of the plasma arc welding gun 2, when the welding end of the plasma arc welding gun 2 is just in the auxiliary groove for welding, the knocking rod 36 cannot enter the auxiliary groove. This requires the use of a controller to control the delayed start of the knocking component 3, which can be specifically set according to the welding movement speed of the plasma arc welding gun 2. It can be started one second or two seconds or other time after the plasma arc welding gun 2 starts welding to ensure that the knocking rod 36 can be extended and retracted to enter the auxiliary groove; secondly, in the process of the welding end of the plasma arc welding gun 2 moving from one auxiliary groove to another, no welding is performed during this process, so that the knocking component 3 is stopped one second or two seconds or other time after the plasma arc welding gun 2 stops welding (also controlled by the controller) to avoid the knocking component 3 hammering the upper end surface of the welding auxiliary plate 5.

[0051] The following description can be made for the controller controlling the delayed start or stop of the knocking component 3: Specific control method (taking PLC as an example):

[0052] Hardware connection: Connect the start / stop signal of the welding gun to the input port of the PLC, and connect the start / stop signal of the knocking component 3 to the output port of the PLC. In this way, the PLC can monitor the status of the welding gun and control the action of the knocking component 3.

[0053] Programming: When the welding gun is started, the PLC input port receives the start signal, and a timer is set in the program to start timing. The timer is set to the required delay time, such as 2 seconds (determined according to the actual welding process requirements);

[0054] When the timer ends, the output port of the PLC outputs a signal to start the knocking component 3;

[0055] When the welding gun stops, another timer is set in the PLC program (or the same timer is used and the program logic is adjusted according to the specific situation). This timer starts timing when the welding gun stop signal arrives, and stops tapping component 3 after a delay of a period of time, such as 2 seconds.

[0056] Debugging and optimization: During the actual welding process, it is necessary to debug the set delay time and observe the effect after welding, such as the quality of the welded joint. According to the observation results, the delay time should be appropriately adjusted to achieve the best welding quality and work efficiency.

[0057] Also, see Figure 1-Figure 2 as well as Figure 9-10 As shown, the welding device for centrifugal pump production also includes an auxiliary loading component 7 and a moving component 8. The auxiliary loading component 7 includes a fixed placement column 71 and a movable placement column 72 arranged upper and lower. The fixed placement column 71 and the movable placement column 72 are both provided with a plurality of blade storage slots 12 in a circular array. The number and layout of the blade storage slots 12 on the same layer are the same as the number and layout of the blade insertion slots 9. A blade adjustment member 13 is provided in the fixed placement column 71. The blades in the fixed placement column 71 are gradually released through the blade adjustment member 13 to simultaneously feed multiple blades into the movable placement column 72. A blade movable support 14 is provided in the movable placement column 72. The moving component 8 is used to realize the movement of the movable placement column 72, so that the movable placement column 72 moves to above the welding seat 4, and simultaneously releases multiple blades into the blade insertion slots 9 through the blade movable support 14.

[0058] Among them, see Figures 9-11As shown, the blade adjustment member 13 includes a fourth motor 131 installed in the middle of the top of the fixed placement column 71. The fourth motor 131 is a deflection motor. The output end of the fourth motor 131 is connected to the vertical first connecting shaft 132. The outside of the first connecting shaft 132 is equipped with three layers of blocking members 133 distributed up and down. Each layer of blocking members 133 includes a connected arc rod 1331 and a first arc support bar 1332. The end of the arc rod 1331 away from the first arc support bar 1332 is fixed to the first connecting shaft 132. By starting the fourth motor 131, the output end of the fourth motor 131 can be used to drive the first connecting shaft 132 to rotate, thereby realizing the synchronous deflection of the three layers of blocking members 133.

[0059] Three first grooves 711 are vertically and equidistantly provided on the side wall of the blade storage slot 12 in the fixed placement column 71, and each first groove 711 corresponds to a layer of blocking member 133. The three first grooves 711 divide the blade storage slot 12 in the fixed placement column 71 into a loading area 712, an intermediate temporary storage area 713 and a bottom transfer area 714 from top to bottom. The uppermost and lowermost blocking members 133 are on the same vertical plane, and the uppermost and middle layer blocking members 133 are staggered. Specifically, when the uppermost and lowermost first arc-shaped support bars 1332 are in the blade storage slot 12 in the fixed placement column 71, the first arc-shaped support bar 1332 of the middle layer enters the first groove 711. When the first arc-shaped support bar 1332 of the middle layer enters the blade storage slot 12, the uppermost and lowermost first arc-shaped support bars 1332 are synchronously deflected into the first groove 711.

[0060] The blade movable support 14 includes a fifth motor 141 installed in the middle of the top inside the movable placement column 72. The fifth motor 141 is a deflection motor. The output end of the fifth motor 141 is connected to the second connecting shaft 142. The bottom end of the outer wall of the second connecting shaft 142 is installed with a plurality of second arc-shaped support strips 143 in a circular array. A second groove 721 is provided at the bottom end of the side wall of the blade storage slot 12 in the movable placement column 72. The second arc-shaped support strip 143 can enter or exit the second groove 721. By starting the fifth motor 141, the output end of the fifth motor 141 can be used to drive the second connecting shaft 142 to rotate, thereby realizing the deflection of the second arc-shaped support strip 143, so that the second arc-shaped support strip 143 enters the bottom end of the blade storage slot 12 in the movable placement column 72 to block it, or deflects into the second groove 721 to release the blockage of the second arc-shaped support strip 143.

[0061] See Figure 1 and Figure 2 As shown, the moving assembly 8 includes a third motor 81 installed on one side of the upper end surface of the welding table 1, and a screw 82 is installed at the output end of the third motor 81. The outside of the screw 82 is connected to the mounting sleeve outside the movable placement column 72 through a screw nut seat.

[0062] Secondly, see Figure 8 As shown, it also includes a driving assembly 6 connected to the welding auxiliary disk 5, the driving assembly 6 includes a mounting hoop 61 and a mounting seat 62, the mounting hoop 61 is fixed to the outside of the welding auxiliary disk 5, the mounting seat 62 is arranged in the welding table 1, and a vertical second motor 63 is installed on the mounting seat 62, the second motor 63 is a deflection motor, the top of the second motor 63 and the mounting hoop 61 are connected by an axis rod, and a telescopic rod 64 is installed between the mounting seat 62 and the top of the welding table 1. The telescopic rod 64 is an electric telescopic rod or a pneumatic telescopic rod. The output end of the second motor 63 can drive the mounting hoop 61 to deflect, so that the welding auxiliary disk 5 is away from the top of the welding seat 4 or is above the welding seat 4. The telescopic rod 64 can be used to realize the lifting and lowering of the welding auxiliary disk 5, and then the blade disk and the blade inserted into the blade insertion slot 9 can be pressed down synchronously. This downward pressure can make the fit between the blade and the blade disk tighter, and the synchronous downward force can also help the blade and the blade disk to be accurately positioned before welding, and can ensure that multiple blades can be inserted in place.

[0063] In summary, in specific use, the blade adjusting member 13 is first used to block the bottom ends of the loading area 712 and the bottom transfer area 714. Then, the staff can put the impeller blades to be welded into the loading area 712 from the top of the fixed placement column 71, and then use the blade adjusting member 13 to block the bottom end of the intermediate temporary storage area 713. At the same time, the bottom end of the loading area 712 is opened, and the blades in the loading area 712 can be moved down to the intermediate temporary storage area 713. Then, the blade adjusting member 13 is used again to block the bottom ends of the loading area 712 and the bottom transfer area 714. At this time, the intermediate temporary storage area 713 is opened, and the blades inside the intermediate temporary storage area 713 enter the bottom transfer area 714. At this time, the staff can continue to put the blades to be welded in the loading area 712. Afterwards, the blade adjusting member 13 is also used to open the bottom transfer area 714. 4 moves down into the blade storage slot 12 in the movable placement column 72, and then the movable placement column 72 is transferred to the top of the welding seat 4 by the moving component 8, and then the blade movable support 14 is used to release the support of the blade, so that the blade enters the blade insertion slot 9 together and the movable placement column 72 returns to its original position, and then the upper blade disk is placed, and then the welding auxiliary disk 5 is moved to the top of the welding seat 4 and moved down by the driving component 6, so that the blade to be welded and the blade disk are synchronously pressed and positioned, and there is no need to manually insert the blades into the blade insertion slot 9 and press them one by one, which greatly improves the accuracy and stability of the operation. Whether in large-scale industrial production or in the high-end manufacturing field with extremely high product precision requirements, it can significantly improve production efficiency and reduce production costs, while ensuring that the quality and performance of the products meet higher standards.

[0064] Through the cooperation of the blade adjustment part 13, the fixed placement column 71 can always have two layers of blades to be welded. Through the cooperation of the auxiliary loading component 7, etc., continuous loading and welding can be achieved. There is no need to wait for the staff to finish loading after a group of welding is completed before welding, which greatly improves the welding efficiency.

[0065] In addition, after the blades and impeller are placed, the robot arm and the plasma arc welding gun 2 are started to perform welding.

[0066] Example 2: Please refer to Figure 5 As shown, this embodiment is an extension of the embodiment 1: a protrusion 42 is fixed in the middle of the upper end surface of the welding seat 4, and a positioning groove is provided in the middle of the lower end surface of the welding auxiliary plate 5.

[0067] Through the above, after the blade is inserted into the blade insertion groove 9, the blade disc to be welded can be placed on the blade, and the protrusion 42 can be matched with the groove on the blade disc. The specific shape of the protrusion 42 can be set according to the shape of the groove on the blade disc. After the blade disc is placed, the welding auxiliary disc 5 can be placed so that the positioning groove on the lower end face of the welding auxiliary disc 5 matches the upper end face of the blade disc, so that the blade disc and the welding auxiliary disc 5 are placed accurately, wherein the shape of the positioning groove is also set according to the shape of the upper end face of the blade disc.

[0068] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0069] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A welding device for producing centrifugal pumps, comprising a welding table (1), a plasma arc welding gun (2) being mounted on the welding table (1) via a robotic arm, a welding seat (4) being fixed near the middle of the upper end surface of the welding table (1), a plurality of blade insertion slots (9) being arranged in an annular array on the welding seat (4), and a movable welding auxiliary disk (5) being provided above the welding seat (4), the welding auxiliary disk (5) being provided with auxiliary slots corresponding to the blade insertion slots (9), and characterized in that: The invention also comprises: a plurality of heat-conducting airbags (10), wherein carbon dioxide gas that expands when heated is provided inside the heat-conducting airbags (10), an airbag groove (41) is provided on the side wall of the blade insertion groove (9), each of the airbag grooves (41) corresponds to a heat-conducting airbag (10), and a heating plate (11) is provided at the bottom end and inner side wall of the airbag groove (41); A striking assembly (3) is mounted on the end of the robot arm and is located at the rear side of the plasma arc welding gun (2) in the welding direction, and the striking assembly (3) is used to hammer the weld when the plasma arc welding gun (2) moves along the auxiliary slot to weld the blades and the blade disk; An auxiliary loading assembly (7) comprises a fixed placement column (71) and a movable placement column (72) which are arranged in an annular array and have a plurality of blade storage slots (12). A blade adjusting member (13) is provided in the fixed placement column (71). The blades in the fixed placement column (71) are gradually released by the blade adjusting member (13) so that a plurality of blades can be simultaneously fed into the movable placement column (72). A blade movable support (14) is provided in the movable placement column (72). A moving assembly (8) is used to realize the movement of the movable placement column (72), so that the movable placement column (72) moves to above the welding seat (4), and releases multiple blades into the blade insertion slot (9) at the same time through the blade movable support (14); The blade adjustment member (13) comprises a fourth motor (131) installed at the middle of the top of the fixed placement column (71); the output end of the fourth motor (131) is connected to a vertical first connecting shaft (132); and the outside of the first connecting shaft (132) is equipped with three layers of blocking members (133) distributed vertically. The side wall of the blade storage slot (12) in the fixed placement column (71) is provided with three first grooves (711) at equal intervals in the vertical direction. Each of the first grooves (711) corresponds to a layer of blocking elements (133). The three first grooves (711) divide the blade storage slot (12) in the fixed placement column (71) into a loading area (712), an intermediate temporary storage area (713) and a bottom transfer area (714) from top to bottom. The blocking elements (133) in the uppermost and lowermost layers are on the same vertical plane, and the blocking elements (133) in the uppermost and intermediate layers are staggered.

2. The welding device for centrifugal pump production according to claim 1, characterized in that: The knocking assembly (3) comprises a vertical bar (31) fixed on the mechanical arm, a first motor (32) is installed on the upper end of the vertical bar (31) facing the mechanical arm, a first hinge bar (33) located on the other side of the vertical bar (31) is installed on the output end of the first motor (32), the end of the first hinge bar (33) is hinged with a second hinge bar (34), a guide block (35) is fixed on the bottom end of the vertical bar (31) on one side of the first hinge bar (33), a vertical knocking rod (36) is passed through the guide block (35), the top end of the knocking rod (36) is connected to a connecting rod (37), a universal ball (38) is connected between the connecting rod (37) and the second hinge bar (34), and a round head is fixed on the bottom end of the knocking rod (36).

3. The welding device for centrifugal pump production according to claim 1, characterized in that: The heating plate (11) at the bottom end of the airbag groove (41) is a circular structure, and the heating plate (11) on the side wall of the airbag groove (41) is an arc structure.

4. The welding device for centrifugal pump production according to claim 1, characterized in that: Each layer of the blocking member (133) comprises a connected arc-shaped rod (1331) and a first arc-shaped support bar (1332), and one end of the arc-shaped rod (1331) away from the first arc-shaped support bar (1332) is fixed to the first connecting shaft (132).

5. The welding device for centrifugal pump production according to claim 4, characterized in that: The blade movable support (14) includes a fifth motor (141) installed at the middle of the top of the movable placement column (72), the output end of the fifth motor (141) is connected to a second connecting shaft (142), and the bottom end of the outer wall of the second connecting shaft (142) is installed with a plurality of second arc-shaped support strips (143) in a circular array. The bottom end of the side wall of the blade storage groove (12) in the movable placement column (72) is provided with a second groove (721), and the second arc-shaped support strip (143) can enter or exit the second groove (721).

6. The welding device for centrifugal pump production according to claim 1, characterized in that: The invention also includes a driving assembly (6) connected to the welding auxiliary plate (5), wherein the driving assembly (6) includes a mounting hoop (61) and a mounting seat (62), wherein the mounting hoop (61) is fixed to the outside of the welding auxiliary plate (5), and the mounting seat (62) is arranged in the welding table (1), and a vertical second motor (63) is installed on the mounting seat (62), the top of the second motor (63) and the mounting hoop (61) are connected by a shaft, and a telescopic rod (64) is installed between the mounting seat (62) and the top of the inside of the welding table (1).

7. The welding device for centrifugal pump production according to claim 1, characterized in that: The moving assembly (8) includes a third motor (81) installed on one side of the upper end surface of the welding table (1), and a lead screw (82) is installed at the output end of the third motor (81). The outside of the lead screw (82) is connected to the mounting sleeve outside the movable placement column (72) through a lead screw nut seat.

8. The welding device for centrifugal pump production according to claim 1, characterized in that: A convex block (42) is fixed in the middle of the upper end surface of the welding seat (4), and a positioning groove is provided in the middle of the lower end surface of the welding auxiliary plate (5).

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