Automobile crane boom cylinder welding device and method

Abstract

The application discloses a kind of automobile crane boom cylinder welding device and method, it is related to welding tooling technical field, comprising: moving guide rail;Cylinder positioning group pair tooling is provided with several groups, and each group cylinder positioning group pair tooling includes two cylinder positioning components, oppositely set in the two sides of moving guide rail;The side of two cylinder positioning components in each group cylinder positioning group pair tooling is set with lower cover plate centering mechanism, upper cover plate centering mechanism and upper cover plate lifting and pressing mechanism.This application carries out the positioning of width direction to workpiece by cylinder positioning group pair tooling, carries out the positioning of length direction to workpiece by end positioning tooling and cylinder pushing tooling, guarantees the position stability of workpiece, also can guarantee the clearance between cylinder upper cover plate and cylinder lower cover plate by upper cover plate lifting and pressing mechanism to meet preset requirement, realizes the intelligent, automation, high-precision positioning of boom cylinder, guarantees the precision of welding operation.

Description

Technical Field

[0001] This invention relates to the field of welding tooling technology, and in particular to a welding device and method for the boom cylinder of a truck crane. Background Technology

[0002] Taking the assembly and manufacturing of crane boom cylinders for construction machinery as an example, the existing assembly process is usually manual. First, the lower cover plate is hoisted onto the assembly platform and clamped using wedges or simple tooling. Positioning is then determined visually or with measuring tools. Next, the upper cover plate is hoisted onto the lower cover plate and fixed in place using clamps or other simple tooling. End positioning is achieved using guide plates or other tools. During spot welding, to address misalignment issues between the upper and lower cover plates, manual correction using pry bars is employed. This process is labor-intensive and cumbersome, resulting in low efficiency and unreliable assembly accuracy, increasing the difficulty of subsequent cylinder manufacturing processes. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a welding device and method for the boom cylinder of a truck crane.

[0004] To solve the above technical problems, the technical solution of the present invention is as follows:

[0005] A welding device for the boom cylinder of a truck crane, comprising:

[0006] Moving guide rail;

[0007] The cylinder positioning assembly tooling is provided in several sets. Each set of the cylinder positioning assembly tooling includes two cylinder positioning components that slide along the length direction of the moving guide rail, and the two cylinder positioning components are arranged opposite to each other on both sides of the moving guide rail.

[0008] Each set of cylinder positioning assembly is provided with a lower cover plate centering mechanism, an upper cover plate centering mechanism, and an upper cover plate lifting and pressing mechanism on the opposite side of the two cylinder positioning components in the tooling. The lower cover plate centering mechanism includes a first clamping plate that moves along the width direction of the moving guide rail. The upper cover plate centering mechanism includes a second clamping plate that moves along the width direction of the moving guide rail. The upper cover plate lifting and pressing mechanism includes a lifting seat that moves vertically. The lifting seat is located above the second clamping plate. An electromagnet for attracting the upper cover plate is fixedly installed on the lifting seat.

[0009] As a preferred embodiment of the crane boom cylinder welding device of the present invention, each cylinder positioning group is further provided with a lower cover plate flattening mechanism on the opposite side of the two cylinder positioning components in the tooling. The lower cover plate flattening mechanism includes a pressure plate that moves up and down in the vertical direction, and the pressure plate is located between the first clamping plate and the second clamping plate.

[0010] As a preferred embodiment of the welding device for the boom cylinder of the truck crane according to the present invention, the lower cover plate flattening mechanism further includes a movable seat that moves along the width direction of the movable guide rail. The movable seat is located between the first clamping plate and the second clamping plate, and the movable seat is provided with a lifting drive device for driving the pressure plate to rise and fall.

[0011] In a preferred embodiment of the welding device for the boom cylinder of the truck crane described in this invention, an electromagnet for attracting the lower cover plate is fixedly provided on the side of the first clamping plate facing the lower cover plate, and an electromagnet for attracting the upper cover plate is fixedly provided on the side of the second clamping plate facing the upper cover plate.

[0012] In a preferred embodiment of the crane boom cylinder welding device of the present invention, the lower end of the cylinder positioning component is fixedly provided with a traveling base, and the cylinder positioning component is slidably mounted on the moving guide rail via the traveling base.

[0013] As a preferred embodiment of the crane boom cylinder welding device of the present invention, the moving guide rail is provided with an end positioning fixture for positioning the end of the cylinder. The end positioning fixture includes a limiting plate that slides along the length direction of the moving guide rail and a limiting plate driving device for driving the limiting plate to move. The limiting plate is perpendicular to the plane where the moving guide rail is located, and the limiting plate is located at the middle part of the width direction of the moving guide rail.

[0014] As a preferred embodiment of the crane boom cylinder welding device of the present invention, wherein: a cylinder pushing fixture for pushing the cylinder is provided on the moving guide rail, the cylinder pushing fixture includes a push plate that slides along the length direction of the moving guide rail and a push plate driving device for driving the push plate to move, the push plate is located between two cylinder positioning components in each set of cylinder positioning pair fixtures, and can pass through between the two cylinder positioning components.

[0015] As a preferred embodiment of the crane boom cylinder welding device of the present invention, a line laser sensor for detecting the gap between the upper cover plate and the lower cover plate of the cylinder is provided on the cylinder positioning component located in the middle.

[0016] The present invention also provides a method for welding the boom cylinder of a truck crane, comprising:

[0017] Obtain the dimensional information of the workpiece to be welded;

[0018] Based on the size information of the workpiece to be welded, the end positioning fixture, the cylinder pushing fixture, and several sets of cylinder positioning assembly fixtures are moved to the predetermined positions.

[0019] The lower cover plate of the cylinder is hoisted onto the moving guide rail and positioned between the end positioning fixture, the cylinder pushing fixture, and several sets of cylinder positioning assembly fixtures.

[0020] The cylinder pushing fixture pushes the lower cover plate of the cylinder to the end positioning fixture. Then the cylinder pushing fixture moves backward to avoid it. Then the lower cover plate centering mechanism in the cylinder positioning assembly operates to center and position the lower cover plate of the cylinder. Next, the lower cover plate flattening mechanism presses the lower cover plate of the cylinder down until both sides of the lower cover plate are in the same horizontal plane. Then the electromagnet in the lower cover plate centering mechanism is energized to attract and position the lower cover plate of the cylinder.

[0021] The upper cover plate of the cylinder is hoisted onto the lower cover plate flattening mechanism. The cylinder pushing fixture pushes the upper cover plate to the end positioning fixture. Then the cylinder pushing fixture moves backward to avoid it. Then the cylinder positioning assembly operates the upper cover plate centering mechanism in the fixture to center and position the upper cover plate. At the same time, the upper cover plate lifting and pressing mechanism uses an electromagnet to attract the upper surface of the upper cover plate and lifts the upper cover plate to an appropriate height.

[0022] The lower cover plate flattening mechanism retracts, and then the upper cover plate lifting and pressing mechanism descends synchronously. In conjunction with the line laser sensor, the gap between the upper cover plate and the lower cover plate of the cylinder is detected, so that the gap between the upper cover plate and the lower cover plate of the cylinder reaches the preset value. Then, the electromagnet in the upper cover plate centering mechanism is energized to attract and position the upper cover plate of the cylinder.

[0023] Operators are performing welding work on the cylinder.

[0024] In a preferred embodiment of the welding method for the boom cylinder of a truck crane according to the present invention, after the operator performs welding operations on the cylinder, the method further includes:

[0025] The four cylinder positioning components at both ends of the cylinder are held in place by the adsorption of the cylinder. The electromagnets on several cylinder positioning components in the middle are demagnetized. The cylinder positioning components in the middle move along the moving guide rail and use a line laser sensor to perform a full-length detection of the gap between the upper and lower cover plates of the cylinder to determine if there is an abnormal gap. If there is, a set of cylinder positioning components is controlled to move to that position and perform the lower cover plate centering and upper cover plate centering operations. Then, the upper cover plate lifting and pressing mechanism is used to correct the gap. After the correction is completed, the operator performs welding operations.

[0026] The beneficial effects of this invention are:

[0027] (1) The present invention uses a cylinder positioning assembly to center and stably clamp the upper and lower cover plates of the cylinder using a tooling assembly. It can also ensure that the gap between the upper and lower cover plates of the cylinder meets the preset requirements, which facilitates the subsequent welding operations of the operator. This invention realizes intelligent, automated and high-precision positioning assembly of the boom cylinder, which greatly reduces the workload and intensity of the operator, effectively improves work efficiency and ensures the accuracy of the welding operation.

[0028] (2) The present invention uses the end positioning fixture and the cylinder pushing fixture to position the workpiece in the length direction, and the cylinder positioning group to position the workpiece in the width direction, effectively ensuring the positional stability of the workpiece during welding operations.

[0029] (3) The present invention first centers and positions the lower cover plate of the cylinder, then centers and positions the upper cover plate of the cylinder, and then adjusts the height of the upper cover plate of the cylinder through the upper cover plate lifting and pressing mechanism so that the gap between the lower cover plate and the upper cover plate of the cylinder meets the preset requirements. The overall operation is simple and convenient.

[0030] (4) After the cylinder is spot welded and fixed, the present invention will also use a line laser sensor to detect the gap between the upper cover plate and the lower cover plate of the cylinder, and use software to identify the position that needs to be corrected. Then, the gap is corrected for the abnormal position, and finally, it is fixed by manual spot welding, which further improves the accuracy of the welding operation. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the structure of the welding device for the boom cylinder of a truck crane provided by the present invention;

[0033] Figure 2 A schematic diagram of the cylinder positioning component in the truck crane boom cylinder welding device provided by the present invention;

[0034] Figure 3 A schematic diagram of the structure of the boom cylinder of a truck crane;

[0035] Figure 4 A schematic flowchart of the welding method for the boom cylinder of a truck crane provided by the present invention;

[0036] Among them: 100, moving guide rail; 200, cylinder positioning assembly tooling; 210, cylinder positioning component; 211, first clamping plate; 212, second clamping plate; 213, lifting seat; 214, electromagnet; 215, pressure plate; 216, walking base; 300, end positioning tooling; 310, limit plate; 400, cylinder pushing tooling; 410, push plate; 500, workpiece; 510, cylinder upper cover plate; 520, cylinder lower cover plate. Detailed Implementation

[0037] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0038] Figure 1 This is a schematic diagram of the structure of a truck crane boom cylinder welding device provided in an embodiment of this application. The device includes a moving guide rail 100, a cylinder positioning assembly fixture 200, an end positioning fixture 300, and a cylinder pushing fixture 400. The cylinder positioning assembly fixture 200, the end positioning fixture 300, and the cylinder pushing fixture 400 can all move along the length direction of the moving guide rail 100. The end positioning fixture 300 and the cylinder pushing fixture 400 can position the workpiece 500 to be welded in the length direction, while the cylinder positioning assembly fixture 200 can position the workpiece 500 to be welded in the width direction, facilitating welding of the workpiece 500 by the operator.

[0039] For details, see Figure 1 Two transmission racks are provided on the upper end face of the movable guide rail 100. These two transmission racks are arranged sequentially along the width direction of the movable guide rail 100, and the length direction of each transmission rack extends along the length direction of the movable guide rail 100.

[0040] The cylinder positioning assembly has three sets of fixture 200. See [link / reference] Figure 1 Three sets of cylinder positioning fixtures 200 are arranged sequentially along the length of the moving guide rail 100. Each set of cylinder positioning fixtures 200 includes two cylinder positioning components 210. These two cylinder positioning components 210 are slidably mounted on two transmission racks, allowing the cylinder positioning components 210 to move along the length of the moving guide rail 100. The two cylinder positioning components 210 are arranged opposite each other on both sides of the moving guide rail 100.

[0041] In each set of cylinder positioning assembly fixtures 200, each of the two cylinder positioning components 210 facing each other is equipped with a lower cover plate centering mechanism, a lower cover plate flattening mechanism, an upper cover plate centering mechanism, and an upper cover plate lifting and pressing mechanism. (See also...) Figure 2 On each cylinder positioning assembly 210, the lower cover plate centering mechanism, the lower cover plate flattening mechanism, the upper cover plate centering mechanism, and the upper cover plate lifting and pressing mechanism are arranged sequentially from bottom to top.

[0042] The lower cover plate centering mechanism includes a first clamping plate 211 mounted on the cylinder positioning assembly 210. The first clamping plate 211 moves along the width direction of the moving guide rail 100, meaning it can extend or retract along the width direction of the moving guide rail 100. Thus, when both first clamping plates 211 extend outward from the two opposing cylinder positioning assemblies 210, they can clamp the lower cover plate 520 of the cylinder between the two opposing cylinder positioning assemblies 210.

[0043] Understandably, a drive device for moving the first clamping plate 211 is fixedly installed in the cylinder positioning assembly 210. This drive device can be an electric cylinder or a hydraulic cylinder, etc.

[0044] It should be noted that in each set of cylinder positioning fixtures 200, the first clamping plates 211 on the two cylinder positioning components 210 always move synchronously and at the same speed. This ensures the alignment of the lower cover plate 520 of the cylinder when each set of cylinder positioning fixtures 200 clamps the lower cover plate 520 of the cylinder.

[0045] Preferably, an electromagnet 214 is fixedly installed on the side of the first clamping plate 211 facing the lower cover plate 520 of the cylinder. The electromagnet 214 can generate magnetism after being energized, attracting the lower cover plate 520 of the cylinder, thereby positioning the lower cover plate 520 of the cylinder and ensuring the positional stability of the lower cover plate 520 of the cylinder.

[0046] The lower cover plate flattening mechanism includes a movable seat mounted on the cylinder positioning assembly 210. This movable seat moves along the width direction of the moving guide rail 100, meaning it can extend or retract along the width direction of the moving guide rail 100. A pressure plate 215 and a lifting drive device for driving the pressure plate 215 to move vertically are mounted on the movable seat. When the lifting drive device is running, it can drive the pressure plate 215 to descend and press against the side of the lower cover plate 520 of the cylinder.

[0047] The aforementioned lifting drive device can be an electric cylinder or a hydraulic cylinder.

[0048] It should be noted that in each set of cylinder positioning assembly tooling 200, the upper pressure plates 215 of the two cylinder positioning components 210 always move synchronously and at the same speed. In this way, the lower cover plate flattening mechanism on the two cylinder positioning components 210 can ensure that both sides of the lower cover plate 520 of the cylinder are in the same horizontal plane.

[0049] The upper cover plate centering mechanism includes a second clamping plate 212 mounted on the cylinder positioning assembly 210. This second clamping plate 212 also moves along the width direction of the moving guide rail 100, meaning it can extend or retract along the width direction of the moving guide rail 100. Thus, when both second clamping plates 212 extend outward from the two opposing cylinder positioning assemblies 210, the upper cover plate 510 of the cylinder between the two opposing cylinder positioning assemblies 210 can be clamped.

[0050] Understandably, a drive device for moving the second clamping plate 212 is fixedly installed in the cylinder positioning assembly 210. This drive device can be an electric cylinder or a hydraulic cylinder, etc.

[0051] It should be noted that in each set of cylinder positioning fixtures 200, the second clamping plates 212 on the two cylinder positioning components 210 always move synchronously and at the same speed. This ensures the alignment of the cylinder top cover plate 510 when each set of cylinder positioning fixtures 200 clamps the cylinder top cover plate 510.

[0052] Preferably, an electromagnet 214 is also fixedly installed on the side of the second clamping plate 212 facing the lower cover plate 520 of the cylinder. The electromagnet 214 can generate magnetism after being energized, attracting the upper cover plate 510 of the cylinder, thereby positioning the upper cover plate 510 of the cylinder and ensuring the positional stability of the upper cover plate 510 of the cylinder.

[0053] The upper cover lifting and pressing mechanism includes a lifting seat 213 mounted on the cylinder positioning assembly 210, which moves vertically. An electromagnet 214 is fixedly mounted on the lifting seat 213. When energized, the electromagnet 214 can generate magnetism and adhere to the upper end face of the cylinder upper cover 510, thereby driving the cylinder upper cover 510 to move up and down.

[0054] It is understood that a drive device for driving the lifting seat 213 to rise and fall is fixedly installed in the cylinder positioning assembly 210. This drive device can be an electric cylinder or a hydraulic cylinder, etc.

[0055] Additionally, see Figure 2 A traveling base 216 is fixedly installed at the lower end of each cylinder positioning assembly 210, and the cylinder positioning assembly 210 is slidably mounted on the moving guide rail 100 via the traveling base 216. In this embodiment, a drive gear and a drive motor for driving the drive gear to rotate are rotatably installed inside the traveling base 216. The drive gear meshes with a transmission rack on the moving guide rail 100. When the drive motor is running, it drives the drive gear to rotate, and the meshing between the drive gear and the transmission rack drives the traveling base 216 to move along the length direction of the moving guide rail 100.

[0056] Both the end positioning fixture 300 and the cylinder pushing fixture 400 are slidably mounted on the moving guide rail 100 and move along the length of the moving guide rail 100. The end positioning fixture 300 is used to position the ends of the cylinder, specifically one end of the lower cover plate 520 and the upper cover plate 510. The cylinder pushing fixture 400 is used to push the lower cover plate 520 and the upper cover plate 510 to the end positioning fixture 300, thereby positioning the cylinder along its length.

[0057] The end positioning fixture 300 includes a limiting plate 310 that slides along the length of the moving guide rail 100, and a limiting plate 310 driving device for driving the limiting plate 310 to move along the length of the moving guide rail 100. See also Figure 1 The limiting plate 310 is perpendicular to the plane of the moving guide rail 100 and is located in the middle of the width direction of the moving guide rail 100.

[0058] It should be noted that when the upper cover plate 510 or the lower cover plate 520 of the cylinder is located between the cylinder positioning assembly tooling 200, the aforementioned limiting plate 310 is always located on the moving path of the upper cover plate 510 or the lower cover plate 520 of the cylinder, thereby limiting the upper cover plate 510 or the lower cover plate 520 of the cylinder.

[0059] The cylinder pushing fixture 400 includes a push plate 410 that slides along the length of the moving guide rail 100 and a push plate 410 driving device for driving the push plate 410 to move. The push plate 410 is located between two cylinder positioning components 210 in each set of cylinder positioning assembly fixtures 200 and can pass between the two cylinder positioning components 210. When the upper cylinder cover plate 510 or the lower cylinder cover plate 520 is located between the cylinder positioning assembly fixtures 200, the push plate 410 can push the upper cylinder cover plate 510 or the lower cylinder cover plate 520 to move along the length of the moving guide rail 100 until one end of the upper cylinder cover plate 510 or the lower cylinder cover plate 520 is pushed to abut against the limiting plate 310, thereby achieving positioning of the workpiece 500 in the length direction.

[0060] Preferably, a reinforcing rib is also fixedly installed on the side of the limiting plate 310 away from the push plate 410. The reinforcing rib can improve the supporting strength of the limiting plate 310.

[0061] In addition, each cylinder positioning assembly 210 is provided with a line laser sensor for detecting the gap between the upper cylinder cover plate 510 and the lower cylinder cover plate 520.

[0062] See Figure 4 This embodiment also provides a method for welding the boom cylinder of a truck crane, which includes steps S101 to S108, and the specific steps are described below:

[0063] Step S101: Obtain the dimensional information of the workpiece 500 to be welded.

[0064] Specifically, when there is no workpiece 500 at the workstation, the operator obtains the dimensional information of the next workpiece 500 to be welded by scanning a barcode. The dimensional information of workpiece 500 mainly includes its length, width, and height.

[0065] Step S102: Based on the size information of the workpiece 500 to be welded, move the end positioning fixture 300, the cylinder pushing fixture 400, and several sets of cylinder positioning assembly fixtures 200 to the predetermined positions.

[0066] Specifically, in this embodiment, based on the length of the workpiece 500 to be welded, the positions of the end positioning fixture 300, the cylinder pushing fixture 400, and the three sets of cylinder positioning fixtures 200 are preset, and then the head positioning fixture, the cylinder pushing fixture 400, and the three sets of cylinder positioning fixtures 200 are controlled to move to the predetermined positions.

[0067] Step S103: Hoist the lower cover plate 520 of the cylinder onto the moving guide rail 100, and position it between the end positioning fixture 300, the cylinder pushing fixture 400, and several sets of cylinder positioning assembly fixtures 200.

[0068] Step S104: The cylinder pushing fixture 400 pushes the lower cover plate 520 of the cylinder to the end positioning fixture 300. Then the cylinder pushing fixture 400 moves backward to avoid it. Then the lower cover plate centering mechanism in the cylinder positioning assembly 200 operates to center and position the lower cover plate 520 of the cylinder. Then the lower cover plate flattening mechanism presses the lower cover plate 520 of the cylinder down until both sides of the lower cover plate 520 are in the same horizontal plane. Then the electromagnet 214 in the lower cover plate centering mechanism is energized to attract and position the lower cover plate 520 of the cylinder.

[0069] Step S105: The upper cover plate 510 of the cylinder is hoisted onto the lower cover plate flattening mechanism. The cylinder pushing fixture 400 pushes the upper cover plate 510 to the end positioning fixture 300. Then the cylinder pushing fixture 400 moves backward to avoid it. Then the upper cover plate centering mechanism in the cylinder positioning assembly 200 operates to center and position the upper cover plate 510. At the same time, the upper cover plate lifting and pressing mechanism uses the electromagnet 214 to attract the upper surface of the upper cover plate 510 and lift the upper cover plate 510 to an appropriate height.

[0070] Step S106: The lower cover plate flattening mechanism retracts, and then the upper cover plate lifting and pressing mechanism descends synchronously. In conjunction with the line laser sensor, the gap between the upper cover plate 510 and the lower cover plate 520 of the cylinder is detected, so that the gap between the upper cover plate 510 and the lower cover plate 520 of the cylinder reaches the preset value. Then, the electromagnet 214 in the upper cover plate centering mechanism is magnetized to attract and position the upper cover plate 510 of the cylinder.

[0071] Step S107: The operator performs welding operations on the cylinder.

[0072] Specifically, in this embodiment, the operator performs spot welding to fix the cylinder on both sides of the six cylinder positioning components 210.

[0073] Step S108: Maintain the adsorption and positioning of the four cylinder positioning components 210 at both ends of the cylinder with the cylinder body, demagnetize the electromagnets 214 on several cylinder positioning components 210 in the middle, move the cylinder positioning components 210 in the middle along the moving guide rail 100, and use the line laser sensor to perform a full-length detection of the gap between the upper cover plate 510 and the lower cover plate 520 of the cylinder body, and determine whether there is a position with abnormal gap. If there is, control a group of cylinder positioning components 210 to move to that position, and perform the lower cover plate centering and positioning operation and the upper cover plate centering operation. Then, use the upper cover plate lifting and pressing mechanism to correct the gap. After the correction is completed, the operator performs welding operation.

[0074] Specifically, after spot welding, the cylinder is positioned by adsorption using four cylinder positioning components 210 at the front and rear ends. The electromagnets 214 on the two middle cylinder positioning components 210 are demagnetized, and other mechanisms are moved to preset positions to avoid scratching the cylinder. Then, the two middle cylinder positioning components 210 move along the length of the moving guide rail 100, while a line laser sensor performs a full-length detection of the gap between the upper cover plate 510 and the lower cover plate 520. The software then identifies the position requiring correction, i.e., the position of abnormal gap. Subsequently, the two middle cylinder positioning components 210 move to this position and execute the aforementioned lower cover plate centering and upper cover plate centering procedures. The upper cover plate lifting and pressing mechanism corrects the gap between the upper and lower cover plates, and finally, manual spot welding is performed to fix the gap.

[0075] Therefore, the technical solution of this application uses the cylinder positioning assembly to center and position the workpiece with the tooling, thus achieving positioning of the workpiece in the width direction. At the same time, the end positioning tooling and the cylinder pushing tooling position the workpiece in the length direction, effectively ensuring the positional stability of the workpiece during welding operations. Furthermore, the height of the cylinder upper cover plate can be adjusted by the upper cover plate lifting and pressing mechanism to ensure that the gap between the cylinder upper cover plate and the cylinder lower cover plate meets the preset requirements, facilitating subsequent welding operations for operators. This achieves intelligent, automated, and high-precision positioning and assembly of the boom cylinder, greatly reducing the workload and intensity of operators, effectively improving work efficiency, and ensuring the accuracy of welding operations.

[0076] In addition to the above embodiments, the present invention may have other implementation methods; all technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A welding device for the boom cylinder of a truck crane, characterized in that: include: Moving guide rail (100); The cylinder positioning assembly tooling (200) is provided in several sets. Each set of the cylinder positioning assembly tooling (200) includes two cylinder positioning components (210) that slide along the length direction of the moving guide rail (100), and the two cylinder positioning components (210) are arranged opposite to each other on both sides of the moving guide rail (100). In each set of cylinder positioning assembly tooling (200), a lower cover plate centering mechanism, an upper cover plate centering mechanism, and an upper cover plate lifting and pressing mechanism are provided on the opposite side of the two cylinder positioning components (210). The lower cover plate centering mechanism includes a first clamping plate (211) that moves along the width direction of the moving guide rail (100). The upper cover plate centering mechanism includes a second clamping plate (212) that moves along the width direction of the moving guide rail (100). The upper cover plate lifting and pressing mechanism includes a lifting seat (213) that moves vertically. The lifting seat (213) is located above the second clamping plate (212). An electromagnet (214) for adsorbing the upper cover plate is fixedly installed on the lifting seat (213).

2. The welding device for the boom cylinder of a truck crane according to claim 1, characterized in that: Each set of cylinder positioning group is also provided with a lower cover plate flattening mechanism on the opposite side of the two cylinder positioning components (210) in the tooling (200). The lower cover plate flattening mechanism includes a pressure plate (215) that moves up and down in the vertical direction. The pressure plate (215) is located between the first clamping plate (211) and the second clamping plate (212).

3. The welding device for the boom cylinder of a truck crane according to claim 2, characterized in that: The lower cover plate flattening mechanism also includes a movable seat that moves along the width direction of the movable guide rail (100). The movable seat is located between the first clamping plate (211) and the second clamping plate (212). The movable seat is provided with a lifting drive device for driving the pressure plate (215) to rise and fall.

4. The welding device for the boom cylinder of a truck crane according to claim 1, characterized in that: An electromagnet (214) for attracting the lower cover plate is fixedly provided on the side of the first clamping plate (211) facing the lower cover plate, and an electromagnet (214) for attracting the upper cover plate is fixedly provided on the side of the second clamping plate (212) facing the upper cover plate.

5. The welding device for the boom cylinder of a truck crane according to claim 1, characterized in that: The lower end of the cylinder positioning component (210) is fixedly provided with a walking base (216), and the cylinder positioning component (210) is slidably mounted on the moving guide rail (100) through the walking base (216).

6. The welding device for the boom cylinder of a truck crane according to claim 1, characterized in that: The movable guide rail (100) is provided with an end positioning fixture (300) for positioning the end of the cylinder. The end positioning fixture (300) includes a limiting plate (310) that slides along the length direction of the movable guide rail (100) and a limiting plate (310) driving device for driving the limiting plate (310) to move. The limiting plate (310) is perpendicular to the plane where the movable guide rail (100) is located, and the limiting plate (310) is located at the middle part of the width direction of the movable guide rail (100).

7. The welding device for the boom cylinder of a truck crane according to claim 6, characterized in that: The movable guide rail (100) is provided with a cylinder pushing fixture (400) for pushing the cylinder to move. The cylinder pushing fixture (400) includes a push plate (410) that slides along the length direction of the movable guide rail (100) and a push plate (410) driving device for driving the push plate (410) to move. The push plate (410) is located between two cylinder positioning components (210) in each set of cylinder positioning pair fixtures (200) and can pass through between the two cylinder positioning components (210).

8. The welding device for the boom cylinder of a truck crane according to claim 1, characterized in that: A line laser sensor is provided on the cylinder positioning assembly (210) located in the middle for detecting the gap between the upper cover plate (510) and the lower cover plate (520) of the cylinder.

9. A method for welding the boom cylinder of a truck crane, characterized in that: include: Obtain the dimensional information of the workpiece (500) to be welded; Based on the size information of the workpiece (500) to be welded, the end positioning fixture (300), the cylinder pushing fixture (400), and several sets of cylinder positioning assembly fixtures (200) are moved to the predetermined positions; The lower cover plate (520) of the cylinder is hoisted onto the moving guide rail (100) and positioned between the end positioning fixture (300), the cylinder pushing fixture (400), and several sets of cylinder positioning assembly fixtures (200). The cylinder pushing fixture (400) pushes the lower cover plate (520) of the cylinder to the end positioning fixture (300). Then the cylinder pushing fixture (400) moves backward to avoid it. Then the lower cover plate centering mechanism in the cylinder positioning assembly (200) operates to center and position the lower cover plate (520). Then the lower cover plate flattening mechanism presses the lower cover plate (520) down until both sides of the lower cover plate (520) are in the same horizontal plane. Then the electromagnet (214) in the lower cover plate centering mechanism is energized to attract and position the lower cover plate (520). The upper cover plate (510) of the cylinder is hoisted onto the lower cover plate flattening mechanism. The cylinder pushing fixture (400) pushes the upper cover plate (510) to the end positioning fixture (300). Then the cylinder pushing fixture (400) moves backward to avoid it. Then the upper cover plate centering mechanism in the cylinder positioning assembly (200) operates to center and position the upper cover plate (510). At the same time, the upper cover plate lifting and pressing mechanism uses an electromagnet (214) to attract the upper surface of the upper cover plate (510) and lifts the upper cover plate (510) to an appropriate height. The lower cover plate flattening mechanism retracts, and then the upper cover plate lifting and pressing mechanism descends synchronously. In conjunction with the line laser sensor, the gap between the upper cover plate (510) and the lower cover plate (520) of the cylinder is detected, so that the gap between the upper cover plate (510) and the lower cover plate (520) of the cylinder reaches the preset value. Then, the electromagnet (214) in the upper cover plate centering mechanism is magnetized, and the upper cover plate (510) of the cylinder is attracted and positioned. Operators are performing welding work on the cylinder.

10. The method for welding the boom cylinder of a truck crane according to claim 9, characterized in that: After the operator performs welding work on the cylinder, the process also includes: The four cylinder positioning components (210) at both ends of the cylinder are held in place by the adsorption positioning of the cylinder. The electromagnets (214) on several cylinder positioning components (210) in the middle are demagnetized. The cylinder positioning components (210) in the middle move along the moving guide rail (100) and use a line laser sensor to detect the gap between the upper cover plate (510) and the lower cover plate (520) of the cylinder. It is determined whether there is a gap abnormality. If there is, a set of cylinder positioning components (210) is controlled to move to that position and the lower cover plate centering and upper cover plate centering operations are performed. Then, the upper cover plate lifting and pressing mechanism is used to correct the gap. After the correction is completed, the operator performs welding operations.

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