An arm support welding support tool

Abstract

The application provides an arm frame welding support tool, and belongs to the technical field of welding tools, which comprises a support frame and an actuating mechanism mounted on the support frame, the actuating mechanism comprises two support pieces, the two support pieces are movably mounted on the front and back sides of the support frame respectively, and the two support pieces can move relatively in the direction of moving away from or approaching each other; when in use, the arm welding to be welded has an upper groove plate and a lower groove plate which are buckled with each other, the support frame is placed into the arm welding, and under the driving of the actuating mechanism, the two support pieces move in the direction of moving away from each other, so that the two support pieces abut on the front and back side walls where the upper groove plate and the lower groove plate meet each other to form support. At this time, when the upper groove plate and the lower groove plate are welded, the side walls are supported, so that the welding seam will not be recessed inward due to welding deformation, the deformation amount of the arm welding after welding is small, and the arm weldings are more easily installed and slide smoothly.

Description

Technical Field

[0001] This application belongs to the technical field of welding tooling, and more specifically, relates to a boom welding support tooling. Background Technology

[0002] The boom of a fire truck or de-icing truck is composed of multiple welded boom sections, with one section sliding between other sections to achieve boom extension and retraction. The boom section is typically welded together from an upper slotted plate, a lower slotted plate, and a liner plate. Figure 1 As shown, the upper and lower slot plates interlock, and welding is performed at the edges where they meet on both sides. However, in actual production, weld 30 may deform and indent inwards, causing the arms that slide inside to be unable to be assembled or to slide unevenly, affecting production efficiency. Furthermore, due to the narrow internal space of each arm weld, it is difficult to effectively support its sidewalls during welding. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this application provides a boom welding support fixture that provides internal support during the welding of the upper and lower slotted plates of the boom, preventing deformation at the weld seam and ensuring smooth boom welding assembly.

[0004] To achieve the above objectives, the technical solution of this application provides a boom welding support fixture, including a support frame and an actuator mounted on the support frame. The actuator includes two support members, which are movably mounted on the front and rear sides of the support frame, respectively. The two support members can move relative to each other in directions that are away from or close to each other. In use, the arm to be welded has an upper groove plate and a lower groove plate that interlock with each other. The support frame is placed inside the arm to be welded. Under the drive of the actuator, the two support members move in a direction away from each other, so that the two support members abut against the front and rear side walls of the upper and lower groove plates that are connected to each other to form support.

[0005] Optionally, the support frame is a linearly extending strip, and the actuators are arranged in several groups along the extension direction of the support frame. In actual use, the number of actuators can be reasonably set according to the required welding length of the upper and lower slot plates to accommodate welding arms of different lengths.

[0006] Optionally, it also includes a power source. The support frame has an internal mounting cavity. The actuator includes a telescopic cylinder and two sets of sliding support assemblies. The front and rear side walls of the mounting cavity are provided with through holes corresponding to the actuator. The telescopic cylinder is located inside the mounting cavity and is connected to the power source. The two sets of sliding support assemblies are respectively installed at the through holes on the front and rear side walls of the mounting cavity. The telescopic cylinder has a cylinder barrel and a cylinder rod. The telescopic cylinder is slidably installed on the support frame in the front-rear direction. One support member abuts against the cylinder rod through the sliding support assembly at one of the through holes, and the other support member abuts against the cylinder barrel through the sliding support assembly at the other through hole.

[0007] In actual use, the power source is located outside the arm weld, while the support frame and actuator are inserted into the arm weld from the end. After the support frame is in position, the cylinder rod in the telescopic cylinder extends and abuts against the opposite sliding support assembly, causing the corresponding support block to move away from the support frame. When the support block abuts against the inner wall of the arm weld, the cylinder rod continues to extend. Since the cylinder can also slide relative to the support frame, it can then move in the opposite direction relative to the support frame. The cylinder moves away from the support frame by abutting against another support block of the opposite sliding support assembly, and this support block abuts against another inner wall of the arm weld, thus achieving simultaneous support for the front and rear side walls of the arm weld. Because the telescopic cylinder can slide along the support frame, even if the support frame is not aligned when inserted into the arm weld, it ensures that both support blocks abut against the front and rear side walls of the arm weld.

[0008] Optionally, each set of sliding support components includes a fixed flange and a movable flange; the fixed flange includes a flange plate and a boss plate coaxially connected to the flange plate, the outer diameter of the boss plate is smaller than the outer diameter of the flange plate, the flange plate has mounting holes distributed around the boss plate, and several threaded holes corresponding to the mounting holes are opened circumferentially around the through holes, a sliding hole is opened through the axis of the flange plate and the boss plate, the boss plate passes through the corresponding through hole, the flange plate is fitted to the outer side wall of the support frame, and the flange plate is fixedly connected by bolts passing through the mounting holes and the threaded holes; the movable flange has a flange plate and a boss plate coaxially connected to the flange plate. The second boss is coaxially connected to the second flange. The outer diameter of the second boss is smaller than that of the second flange. The end of the second boss away from the second flange has a threaded hole. The axial length of the second boss is greater than the axial length of the sliding hole. The second boss slides through the sliding hole axially. The second flange can slide and abut against the end of the first boss away from the first flange. The support member is fixedly connected to the end of the second boss away from the second flange. In one set of sliding support assemblies, the end of the second flange away from the second boss is in movable contact with the end of the cylinder rod. In another set of sliding support assemblies, the end of the second flange away from the second boss is in movable contact with the cylinder barrel.

[0009] Boss one is inserted into the through hole from the outside of the support frame, and flange one is fitted against the outer wall of the support frame. Then, flange one is fixedly connected by bolts passing through mounting hole one and threaded hole, thus installing the fixed flange. The movable flange is placed inside the mounting frame, and boss two is inserted into the sliding hole from the inside, thus assembling the movable flange. When the cylinder rod retracts, the movable flange and support are in a free axial movement state. When the movable flange moves the maximum distance towards the corresponding support, flange two can abut against the end of the corresponding boss one, limiting the movement distance of the movable flange to one side. Simultaneously, the support is larger than the sliding hole; when the movable flange moves the maximum distance towards the telescopic cylinder, the support abuts against flange one, limiting the movement distance of the movable flange to the other side and preventing the movable flange from falling off.

[0010] Optionally, it also includes a mounting pin. The fixed flange has a pin hole one, which passes through the flange and the boss. A second pin hole passes through the side wall of the cylinder barrel. The second pin hole and the pin holes in the two sets of sliding support assemblies are coaxially aligned. The mounting pin passes through both the second pin hole and the pin holes one in both sets of fixed flanges. Two support members respectively cover both ends of the mounting pin. The telescopic cylinder can slide along the mounting pin, achieving a sliding connection between the telescopic cylinder and the support frame. The two support members respectively cover both ends of the mounting pin, preventing the mounting pin from sliding out axially.

[0011] Optionally, a clearance groove is provided at the end of the support member away from the support frame, and the clearance groove is arranged horizontally. In use, the clearance groove is used to avoid the weld seam where the upper and lower groove plates meet. The second flange has a slot hole coaxial with the first and second pin holes, through which the mounting pin passes. The clearance groove is used to avoid the weld seam where the upper and lower groove plates meet, preventing any impact on the welding. Under the limiting action of the mounting pin, the movable flange will not rotate during use. Since the support member is fixedly connected to the movable flange, the support member will also not rotate. This design ensures that the clearance groove on the support member will not become misaligned with the weld seam due to the rotation of the support member.

[0012] Optionally, the end of the boss away from the flange is provided with a threaded hole, and the bottom wall of the clearance groove is provided with a mounting hole 2 aligned with the threaded hole. The support is fixedly connected to the movable flange by bolts that pass through the mounting hole 2 and are screwed into the threaded hole.

[0013] Optionally, it also includes a connecting pipe and a docking joint, through which the power source is connected to the telescopic cylinder.

[0014] Optionally, the support frame is made of square tubing, with the interior of the tubing serving as a mounting cavity. The top wall of the support frame has a mounting opening. This mounting opening facilitates the assembly of the actuator. During installation, the telescopic cylinder and the movable flange can be inserted into the mounting cavity through the mounting opening for installation.

[0015] Optionally, a roller assembly is provided at the bottom of the support frame. The roller assembly includes a rotating shaft and two sets of bearings. Shaft holes are provided through the front and rear side walls of the support frame, and the rotating shaft passes through the shaft holes. The bearings are respectively fitted onto the front and rear ends of the rotating shaft that protrude from the support frame. Washers are clamped between the two sets of bearings and the outer side wall of the support frame, and the washers are fitted onto the outside of the rotating shaft. Retaining rings are provided at both ends of the rotating shaft, and the retaining rings cover the side of the bearings away from the support frame. When the support frame is inserted into the arm welding assembly from the end, the roller assembly facilitates the insertion of the support frame.

[0016] The advantages of the technical solution in this application compared to the prior art are as follows: After the upper and lower slotted plates are engaged during boom welding, the boom welding support fixture can extend from the end into the narrow boom weld cavity. Driven by the actuator, the two support members move in a direction away from each other, causing them to abut against the front and rear sidewalls where the upper and lower slotted plates meet, forming supports. At this time, when welding the upper and lower slotted plates, due to the support, the weld will not dent inward due to welding deformation. The welded boom has minimal deformation, making it easier to install and slide between boom sections.

[0017] Meanwhile, the distance between the two support components is adjustable, making the boom welding support fixture adaptable to boom welding of different sizes, thus having strong versatility.

[0018] After welding is completed, the actuator releases the two support components, allowing them to detach from the upper and lower slot plates and avoid getting stuck inside the welded arm, making them easy to remove. The fixture can be reused after removal; it is not a disposable tooling. It has a simple structure and low cost. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the welding structure between the upper and lower slot plates; Figure 2 This is a front view of the overall structure of the boom welding support fixture; Figure 3 Left view of the support frame structure with the actuator installed; Figure 4 This is a schematic diagram of the support frame structure; Figure 5 for Figure 2 Sectional view at point AA; Figure 6This is a schematic diagram of a fixed flange structure; Figure 7 This is a schematic diagram of the movable flange structure; Figure 8 for Figure 2 Sectional view at CC; Figure 9 This is a schematic diagram of the support structure; Figure 10 A front sectional view of the support frame with the actuator installed; Figure 11 for Figure 2 Sectional view at point BB.

[0021] Icons: 10. Upper groove plate; 20. Lower groove plate; 30. Weld seam; 1. Support frame; 11. Mounting cavity; 12. Through hole; 13. Threaded hole; 14. Mounting port; 15. Shaft hole; 2. Actuator; 21. Sliding support assembly; 3. Support component; 31. Clearance groove; 32. Mounting hole two; 4. Power source; 41. Connecting pipe; 42. Butt joint; 5. Telescopic cylinder; 51. Cylinder barrel; 52. Cylinder rod; 53. Pin hole two; 6. Fixed flange; 61. Flange one; 62. Boss one; 63. Mounting hole one; 64. Sliding hole; 65. Pin hole one; 7. Movable flange; 71. Flange two; 72. Boss two; 73. Threaded hole; 74. Slotted hole; 8. Mounting pin; 9. Roller assembly; 91. Rotating shaft; 92. Bearing; 93. Washer; 94. Retaining ring. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0023] Example 1: This embodiment provides a boom welding support fixture. In the accompanying drawings, the positive X-axis represents the right side, the negative X-axis represents the left side, the positive Y-axis represents the front side, the positive Y-axis represents the rear side, the positive Z-axis represents the top side, and the negative Z-axis represents the bottom side. Based on Figure 2 and Figure 3As shown, the boom welding support fixture includes a support frame 1 and an actuator 2 mounted on the support frame 1. The actuator 2 includes two support members 3, which are movably mounted on the front and rear sides of the support frame 1, respectively. The two support members 3 can move relative to each other in directions of distance or proximity. In use, the boom to be welded has an upper groove plate 10 and a lower groove plate 20 that interlock with each other. The support frame 1 is placed inside the boom weld. Driven by the actuator 2, the two support members 3 move in directions of distance from each other, so that the two support members 3 abut against the front and rear side walls of the upper groove plate 10 and the lower groove plate 20 respectively to form support.

[0024] In practical use, the two support members 3 abut against the upper and lower sides of the joint of the upper slot plate 10 and the lower slot plate 20, respectively, to simultaneously support the front and rear sidewalls of the upper slot plate 10 and the lower slot plate 20 from the inside. Then, welds are made from the outside along the edges where the upper slot plate 10 and the lower slot plate 20 meet to form a weld 30. During welding, due to the support, the weld 30 will not dent inward due to welding deformation, resulting in minimal deformation of the welded arm section. This makes subsequent arm sections easier to install and slide smoothly. Simultaneously, the distance between the two support members 3 is adjustable, allowing this boom welding support fixture to adapt to boom welds of different sizes, offering strong versatility. After welding, the actuator 2 releases the two support members 3, allowing them to detach from the support of the upper slot plate 10 and the lower slot plate 20 without getting stuck inside the arm weld, facilitating removal. The fixture can be reused after removal, making it a non-disposable tooling with a simple structure and low cost.

[0025] Preferably, the support frame 1 is a linearly extending strip, and the actuator 2 has several groups, which are arranged linearly along the extension direction of the support frame 1. Several groups indicate at least one group. In actual use, the number of actuators 2 can be reasonably set according to the required welding length of the upper slot plate 10 and the lower slot plate 20. In this embodiment, the number of actuators 2 is eight groups.

[0026] Furthermore, based on Figures 2 to 5As shown, it also includes a power source 4, and the actuator 2 includes a telescopic cylinder 5 and two sets of sliding support assemblies 21. The telescopic cylinder 5 can be either a hydraulic cylinder or a pneumatic cylinder, and the corresponding power sources 4 are a hydraulic pump station and a pneumatic source, respectively. The support frame 1 has an installation cavity 11 inside, and the front and rear side walls of the installation cavity 11 are provided with through holes 12 corresponding to the actuator 2. The telescopic cylinder 5 is located in the installation cavity 11 and is connected to the power source 4. The two sets of sliding support assemblies 21 are respectively installed at the through holes 12 on the front and rear side walls of the installation cavity 11. The telescopic cylinder 5 has a cylinder barrel 51 and a cylinder rod 52, and the telescopic cylinder 5 is slidably installed on the support frame 1 in the front-rear direction. The cylinder barrel 51 and the cylinder rod 52 can slide back and forth relative to the support frame 1. One support member 3 abuts against the cylinder rod 52 through the sliding support assembly 21 at one of the through holes 12, and the other support member 3 abuts against the cylinder barrel 51 through the sliding support assembly 21 at the other through hole 12. In this embodiment, the cylinder rod 52 is oriented towards the rear, that is, in the negative direction of the Y-axis. Of course, the cylinder rod 52 can also extend and retract in the positive Y-axis direction.

[0027] In actual use, the power source 4 is located outside the arm weld, and the support frame 1 and the actuator 2 are inserted into the arm weld from the end. After the support frame 1 is in position, the cylinder rod 52 in the telescopic cylinder 5 extends and abuts against the sliding support assembly 21 opposite to it, driving the support block in the negative Y-axis direction to move away from the support frame 1. When the support block in the negative Y-axis direction abuts against the inner wall of the arm weld, the cylinder rod 52 continues to extend. Since the cylinder 51 can also slide relative to the support frame 1, the cylinder 51 can move relative to the support frame 1 in the positive Y-axis direction. The cylinder 51 abuts against the sliding support assembly 21 opposite to it, driving the support block in the positive Y-axis direction to move away from the support frame 1, so that the support block in the positive Y-axis direction abuts against the inner wall of the arm weld, achieving simultaneous support of the front and rear side walls of the arm weld. Through the telescopic cylinder 5, which can slide along the support frame 1, even if the support frame 1 is not aligned in the Y-axis direction when inserted into the arm weld, it can be ensured that both support blocks can abut against the front and rear side walls of the arm weld. A pressure sensor can be installed on the surface of the support block that abuts against the inner wall of the welded arm. Both the pressure sensor and the power source 4 are connected to an external PLC controller. When the supporting force reaches the set pressure, the power source 4 can be controlled to stop driving the cylinder rod 52 to continue extending. After welding is completed, the cylinder rod 52 retracts, the supporting force of the support block on the inner wall of the welded arm is eliminated, and the entire device can be pulled out from the end of the welded arm.

[0028] Furthermore, based on Figures 2 to 7As shown, each sliding support assembly 21 includes a fixed flange 6 and a movable flange 7. The fixed flange 6 includes a flange plate 61 and a boss 62 coaxially connected to the flange plate 61. The outer diameter of the boss 62 is smaller than the outer diameter of the flange plate 61. The flange plate 61 has mounting holes 63 distributed around the boss 62. A plurality of threaded holes 13 corresponding to the mounting holes 63 are circumferentially formed around the through holes 12. A sliding hole 64 passes through the axis of the flange plate 61 and the boss 62, with the boss 62 passing through the corresponding through hole 12. During actual installation, the boss 62 is inserted into the through hole 12 from the outside of the support frame 1, causing the flange plate 61 to fit against the outer wall of the support frame 1. Subsequently, the flange plate 61 is fixedly connected by bolts passing through the mounting holes 63 and the threaded holes 13, thus achieving the installation of the fixed flange 6.

[0029] The movable flange 7 has a second flange 71 and a second boss 72 coaxially connected to the second flange 71. The outer diameter of the second boss 72 is smaller than the outer diameter of the second flange 71. A threaded hole 73 is provided at the end of the second boss 72 away from the second flange 71. The axial length of the second boss 72 is greater than the axial length of the sliding hole 64. The second boss 72 slides axially through the sliding hole 64. The second flange 71 can slide and abut against the end of the second boss 72 away from the second flange 61. The support member 3 is fixedly connected to the end of the second boss 72 away from the second flange 71. After the fixed flange 6 is installed, the movable flange 7 is placed inside the mounting bracket, and the second boss 72 is inserted into the sliding hole 64 from the inside.

[0030] In one set of sliding support assemblies 21, the end of flange 71 facing away from boss 72 movably abuts against the end of cylinder rod 52. In the other set of sliding support assemblies 21, the end of flange 71 facing away from boss 72 movably abuts against cylinder 51. In this embodiment, flange 71 located behind telescopic cylinder 5 movably abuts against the end of cylinder rod 52, and flange 71 located in front of telescopic cylinder 5 movably abuts against cylinder 51.

[0031] It should be noted that flange 71 is not fixed to cylinder 51 and cylinder rod 52. When cylinder rod 52 extends, cylinder 51 and cylinder rod 52 abut against the corresponding flange 71, causing the movable flange 7 to slide within the corresponding sliding hole 64, thereby moving the front and rear support members 3 away from the support frame 1 to support the arm welding. When cylinder rod 52 retracts, the movable flange 7 and support members 3 are in a free-moving state in the Y-axis direction. When the movable flange 7 moves the maximum distance towards the corresponding support member 3, its flange 71 can abut against the end of the corresponding boss 62, thus limiting the movement distance of the movable flange 7 to one side. At the same time, the size of the support member 3 is larger than the sliding hole 64. When the movable flange 7 moves the maximum distance towards the telescopic cylinder 5, the support member 3 abuts against flange 61, thus limiting the movement distance of the movable flange 7 to the other side and preventing the movable flange 7 from falling off.

[0032] Furthermore, based on Figure 2 , Figure 6 , Figure 7 and Figure 8 As shown, it also includes a mounting pin 8. The fixed flange 6 has a pin hole 65, which passes through the flange 61 and the boss 62. A second pin hole 53 passes through the side wall of the cylinder 51. The second pin hole 53 and the pin holes 65 in the two sets of sliding support assemblies 21 are coaxially aligned. The mounting pin 8 passes through both the second pin hole 53 and the pin holes 65 in the two sets of fixed flanges 6. Two support members 3 respectively cover both ends of the mounting pin 8. The telescopic cylinder 5 can slide along the mounting pin 8, achieving a sliding connection between the telescopic cylinder 5 and the support frame 1. The two support members 3 respectively cover both ends of the mounting pin 8. In the specific design, when the support member 3 is furthest from the support frame 1, that is, when the flange 71 of the corresponding sliding flange abuts against the boss 62 of the fixed flange 6, the mounting pin 8 cannot axially disengage from either fixed flange 6, thus preventing the mounting pin 8 from sliding out axially.

[0033] In this embodiment, the mounting pin 8 has a circular cross-section. Each fixed flange 6 has at least two pin holes 65, and each cylinder 51 has at least two pin holes 53, corresponding to at least two mounting pins 8, to prevent the cylinder 51 from rotating along the mounting pin 8. In other embodiments, the mounting pin 8 can also have a polygonal cross-section, with pin holes 65 and 53 also being polygonal holes that mate with the mounting pin 8. In this case, only one mounting pin 8 is needed to prevent the cylinder 51 from rotating.

[0034] Furthermore, based on Figure 3 and Figure 9 As shown, the end of the support member 3 furthest from the support frame 1 has a clearance groove 31, which extends through the left and right sides. In use, the clearance groove 31 is used to avoid the weld 30 where the upper groove plate 10 and the lower groove plate 20 meet, preventing any impact on the welding. In actual use, the outer wall of the support member 3 at the top of the weld 30 supports the inner wall of the upper groove plate 10, and the outer wall of the support member 3 at the bottom of the weld 30 supports the inner wall of the lower groove plate 20. Meanwhile, based on... Figure 7 and Figure 8As shown, flange 71 has a slot 74 coaxially arranged with pin hole 65 and pin hole 53, through which mounting pin 8 passes. The slot 74 can be either a groove or a hole. In this embodiment, the slot 74 is a groove, with two slots 74 on each flange, and two mounting pins 8 passing through the two slots 74 respectively. Under the limiting effect of the mounting pins 8, the movable flange 7 will not rotate during use. Since the support member 3 is fixedly connected to the movable flange 7, the support member 3 will also not rotate. This arrangement ensures that the clearance groove 31 on the support member 3 will not become misaligned with the weld 30 due to the rotation of the support member 3.

[0035] Furthermore, based on Figure 7 , Figure 8 and Figure 9 As shown, the end of the boss 72 furthest from the flange 71 has a threaded hole 73, and the bottom wall of the clearance groove 31 has a mounting hole 32 aligned with the threaded hole 73. The support member 3 is fixedly connected to the movable flange 7 by bolts passing through the mounting hole 32 and screwed into the threaded hole 73. After installation, the bolts do not protrude from the surface of the support member 3 that is in contact with the arm, thus avoiding the bolts affecting the support. There are at least two threaded holes 73 and two mounting holes 32 to prevent the support member 3 from rotating relative to the movable flange 7.

[0036] Furthermore, based on Figure 2 and Figure 10 As shown, it also includes a connecting pipe 41 and a docking joint 42. The power source 4 is connected to the telescopic cylinder 5 through the connecting pipe 41 and the docking joint 42. In this embodiment, one end of the connecting pipe 41 is connected to the power source 4, and the same number of docking joints 42 as the actuator 2 are distributed along the extension direction of the connecting pipe 41 into the mounting cavity 11. All docking joints 42 are T-shaped tee joints. The left and right interfaces of the T-shaped tee joint are linearly connected through the connecting pipe 41, and the right port of the rightmost T-shaped tee joint is blocked. The bottom interface of each T-shaped tee joint is connected to the corresponding telescopic cylinder 5.

[0037] Furthermore, based on Figure 4 As shown, the support frame 1 is made of square tubing, with the interior of the tubing serving as a mounting cavity 11. The top wall of the support frame 1 has a mounting opening 14. The mounting opening 14 facilitates the assembly of the actuator 2. During installation, the telescopic cylinder 5 and the movable flange 7 can be inserted into the mounting cavity 11 through the mounting opening 14. In this embodiment, the support frame 1 has mounting openings 14 at the top of the gap between every two adjacent actuators 2. The telescopic cylinder 5 and the movable flange 7 in two adjacent actuators 2 can both be inserted into the mounting cavity 11 through their respective mounting openings 14. In other embodiments, mounting openings 14 can also be provided on the top of each actuator 2.

[0038] Furthermore, based on Figure 1 and Figure 11 As shown, a roller assembly 9 is provided at the bottom of the support frame 1. When the support frame 1 is inserted into the arm welding assembly from the end, the roller assembly 9 facilitates the insertion of the support frame 1. The roller assembly 9 includes a rotating shaft 91 and two sets of bearings 92. A shaft hole 15 is provided through the front and rear side walls of the support frame 1. The rotating shaft 91 passes through the shaft hole 15. The bearings 92 are respectively sleeved on the front and rear ends of the rotating shaft 91 that protrude from the support frame 1. A washer 93 is clamped between each set of bearings 92 and the outer side wall of the support frame 1. The washer 93 is sleeved on the outside of the rotating shaft 91. The washer 93 abuts against the inner ring end of the bearing 92. A retaining ring 94 is provided at both ends of the rotating shaft 91. The retaining ring 94 covers the side of the bearing 92 away from the support frame 1 and abuts against the inner ring end of the bearing 92. The washer 93 can isolate the bearing 92 from the outer side wall of the support frame 1, preventing the bearing 92 from rubbing against the outer side wall of the support frame 1 when rotating. The retaining ring 94 prevents the bearing 92 from detaching from the shaft 91. For a support frame 1 with a long extension distance, multiple sets of roller assemblies 9 can be provided along the extension direction of the support frame 1. In this embodiment, there are three sets of roller assemblies 9.

[0039] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A boom welding support fixture, characterized in that: The device includes a support frame and an actuator mounted on the support frame. The actuator includes two support members, which are movably mounted on the front and rear sides of the support frame, respectively. The two support members can move relative to each other in directions that are away from or close to each other. In use, the arm to be welded has an upper groove plate and a lower groove plate that interlock with each other. The support frame is placed inside the arm to be welded. Under the drive of the actuator, the two support members move in a direction away from each other, so that the two support members abut against the front and rear side walls of the upper and lower groove plates respectively to form support.

2. The boom welding support fixture as described in claim 1, characterized in that: The support frame is a linearly extending strip, and the actuator has several groups, which are arranged linearly along the extension direction of the support frame.

3. The boom welding support fixture as described in claim 1 or 2, characterized in that: It also includes a power source. The actuator includes a telescopic cylinder and two sets of sliding support assemblies. The support frame has an internal mounting cavity. The front and rear side walls of the mounting cavity are provided with through holes corresponding to the actuator. The telescopic cylinder is located in the mounting cavity and is connected to the power source. The two sets of sliding support assemblies are respectively installed at the through holes on the front and rear side walls of the mounting cavity. The telescopic cylinder has a cylinder barrel and a cylinder rod. The telescopic cylinder is slidably installed on the support frame in the front-rear direction. One of the support members abuts against the cylinder rod through the sliding support assembly at one of the through holes, and the other support member abuts against the cylinder barrel through the sliding support assembly at the other through hole.

4. The boom welding support fixture as described in claim 3, characterized in that: Each set of sliding support components includes a fixed flange and a movable flange; The fixed flange includes a flange and a boss coaxially connected to the flange. The outer diameter of the boss is smaller than the outer diameter of the flange. The flange has mounting holes distributed around the boss. A plurality of threaded holes corresponding to the mounting holes are opened circumferentially around the through holes. A sliding hole is opened through the axis of the flange and the boss. The boss passes through the corresponding through hole. The flange fits against the outer side wall of the support frame. The flange is fixedly connected by bolts passing through the mounting holes and the threaded holes. The movable flange has a second flange and a second boss coaxially connected to the second flange. The outer diameter of the second boss is smaller than the outer diameter of the second flange. A threaded hole is provided at the end of the second boss away from the second flange. The axial length of the second boss is greater than the axial length of the sliding hole. The second boss slides through the sliding hole axially. The second flange can slide against the end of the first boss away from the first flange. The support member is fixedly connected to the end of the second boss away from the second flange. In one set of the sliding support assemblies, the end of the flange two away from the boss two is in movable contact with the end of the cylinder rod; in the other set of the sliding support assemblies, the end of the flange two away from the boss two is in movable contact with the cylinder barrel.

5. The boom welding support fixture as described in claim 4, characterized in that: It also includes an installation pin. The fixed flange has a pin hole 1, which passes through the flange 1 and the boss 1. The cylinder has a pin hole 2, which passes through the side wall of the cylinder. The pin hole 2 and the pin holes in the two sets of sliding support assemblies are coaxially aligned. The installation pin passes through both the pin hole 2 and the pin holes 1 of the two sets of fixed flanges. The two support members respectively cover the two ends of the installation pin.

6. The boom welding support fixture as described in claim 5, characterized in that: The support member has a clearance groove at its end away from the support frame, and the clearance groove is arranged through the left and right sides; in use, the clearance groove is used to avoid the weld seam where the upper and lower groove plates meet; the flange two has a slot hole that is coaxial with the pin hole one and the pin hole two, and the mounting pin passes through the slot hole.

7. The boom welding support fixture as described in claim 6, characterized in that: The end of the boss two away from the flange two is provided with a threaded hole, and the bottom wall of the clearance groove is provided with a mounting hole two aligned with the threaded hole. The support member is fixedly connected to the movable flange by a bolt passing through the mounting hole two and screwed into the threaded hole.

8. The boom welding support fixture as described in claim 3, characterized in that: It also includes a connecting pipe and a docking joint, through which the power source is connected to the telescopic cylinder.

9. The boom welding support fixture as described in claim 3, characterized in that: The support frame is made of square tubing, with the interior of the square tubing serving as the mounting cavity, and the top wall of the support frame having an mounting opening.

10. The boom welding support fixture as described in claim 1, characterized in that: The bottom of the support frame is provided with a roller assembly, which includes a rotating shaft and two sets of bearings. A shaft hole is opened through the front and rear side walls of the support frame, and the rotating shaft passes through the shaft hole. The bearings are respectively sleeved on the front and rear ends of the rotating shaft that extend out of the support frame. Washers are clamped between the two sets of bearings and the outer side wall of the support frame, and the washers are sleeved on the outside of the rotating shaft. Retaining rings are provided at both ends of the rotating shaft, and the retaining rings cover the side of the bearing that is away from the support frame.

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