Shaft sleeve riveting and welding positioning mechanism and fork arm shaft sleeve riveting tool

Abstract

The application discloses a shaft sleeve riveting and welding positioning mechanism and a scissors arm shaft sleeve riveting and welding tool. The shaft sleeve riveting and welding positioning mechanism comprises a flange plate and a support plate. An extension positioning pin shaft is arranged in the flange plate. The support plate is used for being mounted on a reinforcing plate of the shaft sleeve riveting and welding tool. The support plate is sleeved on the extension positioning pin shaft. The front plate surface of the support plate is tightly and axially fastened to the axial tail end surface of the flange plate. The scissors arm shaft sleeve riveting and welding tool comprises a tool frame and a plurality of shaft sleeve riveting and welding positioning mechanisms. The tool frame comprises a plurality of reinforcing plates on both sides. The shaft sleeve riveting and welding positioning mechanisms are used for welding and positioning the two ends of a shaft sleeve workpiece. The support plate is tightly and fastened to the reinforcing plate. The extension positioning pin shaft extends through the reinforcing plate to the end of the shaft sleeve workpiece to realize positioning. In the tool, the flange plate is connected to the support plate and has no interference fit requirement with the shaft hole on the reinforcing plate. The machining precision requirement of the outer surface of the tool frame and the flange plate is reduced, and the tool maintenance cost is low.

Description

Technical Field

[0001] This application belongs to the field of engineering machinery processing, specifically, it relates to a scissor arm bushing riveting and welding fixture and a bushing riveting and welding positioning mechanism. Background Technology

[0002] In the scissor lift aerial work platform, the parallelism and center hole distance between the various bushing components require high precision. For example... Figure 1 , Figure 2 As shown, in the existing scissor lift bushing riveting fixture, after the rectangular tube workpiece 104 is fixed by the fixture frame 200, multiple reinforcing plates 100 are arranged on both sides of the frame, and multiple sets of bushing riveting positioning mechanisms 10 are installed in the positioning shaft holes of the reinforcing plates 100 through flanges. The flanges are interference-fitted with the positioning shaft holes, and the flanges contain copper bushings and telescopic positioning pins. The positioning pins and the front positioning pins are pushed and extended by a tail-end cylinder, thereby achieving the positioning of the scissor lift bushing workpiece.

[0003] To ensure accuracy, the existing scissor lift bushing riveting fixture requires machining the entire fixture frame as a single unit on a machine tool, resulting in high manufacturing costs. The flange and fixture frame's positioning shaft holes use an interference fit, meaning the position of the telescopic positioning pin installed inside the flange can only be adjusted axially; the radial position can only be guaranteed by the fixture's machining accuracy. If machining accuracy becomes abnormal, it is difficult to adjust and optimize the fixture's accuracy according to actual production conditions, affecting the fixture's effective usability. Summary of the Invention

[0004] The purpose of this application is to provide a bushing riveting and welding positioning mechanism and a scissor arm bushing riveting and welding fixture, so as to reduce the manufacturing cost of the fixture and make it more conducive to the adjustment and optimization of the fixture accuracy.

[0005] According to a first aspect of this application, a bushing riveting and welding positioning mechanism is provided, comprising:

[0006] A flange, wherein a telescopic positioning pin is inserted inside the flange;

[0007] A support plate is used to be installed on the reinforcing plate of the bushing riveting fixture. The support plate is fitted onto the telescopic positioning pin, and the front surface of the support plate is axially fitted and fastened to the axial tail end face of the flange.

[0008] In some embodiments, the flange includes:

[0009] The central sleeve is coaxially fitted onto the telescopic positioning pin.

[0010] The flange portion is located at the tail end of the central sleeve portion and expands radially outward;

[0011] Multiple flange fasteners are arranged at circumferential intervals along the flange portion and pass through the flange portion and the support plate.

[0012] In some embodiments, the flange fasteners include flange fixing bolts and flange fixing pins; and / or, the outer peripheral surface of the flange is perpendicular to the front surface of the support plate.

[0013] In some embodiments, the support plate has a plurality of Y-direction connecting holes that are fastened to the reinforcing plate along the Y direction, and a Y-direction support plate connector that passes through the Y-direction connecting holes one by one. The diameter of the Y-direction connecting hole is the sum of the outer diameter of the Y-direction support plate connector and the radial adjustment allowance of the flange.

[0014] In some embodiments, the radial adjustment margin of the flange is not less than 3 mm.

[0015] In some embodiments, the support plate is a rectangular plate and includes a first rectangular side extending along the X direction and a second rectangular side extending along the Z direction; the bushing riveting and positioning mechanism further includes:

[0016] An X-axis support block is installed on the second rectangular side of the support plate, and its installation position along the X direction is adjustable.

[0017] The Z-axis support block is installed on the first rectangular side of the support plate and its installation position along the Z direction is adjustable.

[0018] In some embodiments, the X-direction support block is connected to the second rectangular side of the support plate by a plurality of X-direction support block connecting bolts extending along the X direction, and a plurality of X-direction adjusting shims are provided between the X-direction support block and the second rectangular side.

[0019] Furthermore, the Z-direction support block is connected to the first rectangular side of the support plate by a plurality of Z-direction support block connecting bolts extending along the Z direction, and a plurality of Z-direction adjusting shims are provided between the Z-direction support block and the first rectangular side.

[0020] In some embodiments, the rear end face of the X-direction support block and the rear end face of the Z-direction support block are provided with Y-direction support block connecting bolts and Y-direction support block connecting pins for connecting to the reinforcing plate along the Y direction.

[0021] In some embodiments, the bushing riveting and positioning mechanism includes:

[0022] A pin drive mechanism is used to drive the telescopic positioning pin forward or backward;

[0023] A drive mechanism mounting plate is connected between the pin drive mechanism and the support plate;

[0024] A travel self-locking limit mechanism is installed on the side of the drive mechanism mounting plate and is used to limit the forward and backward movement of the telescopic positioning pin.

[0025] In some embodiments, a positioning pin is installed at the front end of the telescopic positioning pin shaft, and a radially protruding flange positioning portion is formed at the rear end; the stroke self-locking limit mechanism includes:

[0026] Limit drive mechanism; and

[0027] The Y-axis limiting block is used to extend into the flange positioning part of the support plate and the telescopic positioning pin under the drive of the limiting drive mechanism to limit the movement.

[0028] The Y-direction limiting block is provided with several limiting adjustment shims for adjusting the position of the limiting block.

[0029] According to a first aspect of this application, a scissor lift arm bushing riveting and welding fixture is also provided. The scissor lift arm includes a rectangular tube workpiece and a plurality of bushing workpieces. The scissor lift arm bushing riveting and welding fixture includes:

[0030] The tooling frame includes a rectangular tube clamping portion for clamping the rectangular tube workpiece and a plurality of reinforcing plates symmetrically arranged on both sides of the rectangular tube clamping portion; and

[0031] Multiple bushing riveting and positioning mechanisms are used to weld and position the two ends of the bushing workpiece.

[0032] The support plate is fastened to the reinforcing plate, and the telescopic positioning pin extends through the reinforcing plate to the end of the bushing workpiece.

[0033] In some embodiments, the flange is fitted into a flange mounting hole on the reinforcing plate with a clearance fit, and the radial position of the flange can be adjusted by the support plate.

[0034] The bushing riveting and positioning mechanism of this application incorporates a support plate. The flange is indirectly connected to the reinforcing plate via the support plate. The original interference fit mounting within the reinforcing plate of the tooling frame is replaced by mounting on the support plate, significantly reducing the machining accuracy requirements of the tooling frame and the requirements for the outer surface machining of the flange. This simplifies the tooling manufacturing process and reduces tooling development costs. The flange can be fitted with a clearance fit into the flange mounting holes on the reinforcing plate, and the radial position of the flange can be easily adjusted via the support plate. Therefore, the scissor arm bushing riveting and welding tooling of this application does not require precision machining of multiple bushing holes using equipment such as boring machines. Furthermore, only the relevant shims need to be adjusted as needed, simplifying the tooling accuracy maintenance process and greatly reducing tooling maintenance costs.

[0035] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0036] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings:

[0037] Figure 1 , Figure 2 These are three-dimensional views of the existing scissor arm bushing riveting and welding fixture and its bushing riveting and welding positioning mechanism;

[0038] Figure 3 , Figure 4 These are perspective views of the bushing riveting and positioning mechanism according to a specific embodiment of this application, viewed from the front and rear views, respectively.

[0039] Figure 5 A perspective view of a travel self-locking limit mechanism according to a specific embodiment of this application;

[0040] Figure 6 This is a perspective view of a bushing riveting and positioning mechanism according to a specific embodiment of this application, wherein a bushing is installed... Figure 5 The shown is a travel self-locking limit mechanism;

[0041] Figure 7 This is a schematic diagram of the mounting structure of the bushing riveting and positioning mechanism according to a specific embodiment of this application when mounted on a reinforcing plate; and

[0042] Figure 8 This is a perspective view of a scissor arm bushing riveting and welding fixture according to a specific embodiment of this application.

[0043] Explanation of reference numerals in the attached figures

[0044] 1. Flange 2. Telescopic positioning pin

[0045] 3 Support plate 4 X-axis support block

[0046] 5 Z-axis support block 6 Drive mechanism mounting plate

[0047] 7. Pin-shaft drive mechanism; 8. Stroke self-locking limit mechanism

[0048] 9. Locating pin; 10. Shaft sleeve riveting and welding positioning mechanism

[0049] 11. Central sleeve section 12. Flange section

[0050] 13 Flange fixing bolts 14 Flange fixing pins

[0051] 15 Copper bushing 16 Buffer ring

[0052] 21 Flange positioning part; 31 Y-direction support plate connector

[0053] 41 X-direction support block connecting bolt 42 X-direction adjusting shim

[0054] 43 First Y-direction support block connecting bolt 44 First Y-direction support block connecting pin

[0055] 51 Z-direction support block connecting bolt 52 Z-direction adjusting shim

[0056] 53 Second Y-axis support block connecting bolt 54 Second Y-axis support block connecting pin

[0057] 81 Limit drive mechanism 82 Y-direction limit block

[0058] 83 Limit adjustment shim 84 Guide rod

[0059] 85 Limit Block Mounting Plate

[0060] 100 Reinforcing plate 101 First bushing workpiece

[0061] 102 Second bushing workpiece; 103 Third bushing workpiece

[0062] 104 Rectangular tube workpiece 200 Tooling frame Detailed Implementation

[0063] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0064] The following description, with reference to the accompanying drawings, describes the scissor arm bushing riveting and welding fixture and bushing riveting and welding positioning mechanism according to this application.

[0065] The scissor arm bushings (hereinafter referred to as scissor arm bushings) of scissor lift aerial work platforms need to be riveted and welded onto rectangular tube workpieces. For example... Figure 1In the scissor lift structure shown, the first bushing workpiece 101, the second bushing workpiece 102, and the third bushing workpiece 103 need to be completely parallel to each other and their ends are riveted to the shaft holes of the parallel tubes on both sides of the rectangular tube workpiece 104. The tooling frame 200 designed for this purpose is used to fix the rectangular tube workpiece 104. The bushing riveting and positioning mechanism needs to adjust the positioning pin 9 at the end to position the end of the bushing workpiece. However, although the parallelism and center hole distance between the bushings of the scissor lift have high precision requirements, as mentioned earlier, the existing bushing riveting and positioning mechanism is installed on the reinforcing plate 100 by an interference fit of the flange. This results in the inability to adjust the positional accuracy of the bushing riveting and positioning mechanism in the X and Z directions shown in the figure, making it impossible to optimize the precision of the scissor lift according to actual production conditions. The adjustability of the tooling precision is poor. Moreover, the positional accuracy of each bushing of the scissor lift mainly relies on the six flange mounting shaft holes on the reinforcing plate 100 of the integrally machined tooling frame, resulting in high overall tooling manufacturing costs. In addition, the flange and shaft hole have an interference fit requirement, and the outer surface of the flange also has high precision machining requirements.

[0066] Therefore, in the specific embodiments of this application, such as Figure 3 As shown, a novel bushing riveting and positioning mechanism 10 is disclosed, comprising:

[0067] Flange 1, with a telescopic positioning pin 2 passing through the inside of flange 1;

[0068] Support plate 3 is used to be installed on the reinforcing plate 100 of the bushing riveting fixture. Support plate 3 is fitted onto telescopic positioning pin 2. The front plate surface of support plate 3 is axially fitted and fastened to the axial tail end surface of flange 1.

[0069] In the bushing riveting and positioning mechanism 10 of this application, a support plate 3 is added. The flange 1 is indirectly connected to the reinforcing plate 100 through the support plate 3, thereby adjusting the radial position of the telescopic positioning pin 2. In this way, the original interference fit installation inside the tooling frame 200 is changed to installation on the support plate 3, which can greatly reduce the machining accuracy requirements of the tooling frame 200, and at the same time greatly reduce the requirements for the machining of the outer cylindrical surface of the flange, which can greatly simplify the tooling manufacturing process and reduce the tooling development cost.

[0070] Combination Figure 3 , Figure 7 As shown, the flange 1 in this embodiment may include:

[0071] The central sleeve 11 is coaxially sleeved on the telescopic positioning pin 2;

[0072] Flange 12 is located at the tail end of the central sleeve 11 and expands radially outward;

[0073] Multiple flange fasteners are arranged at intervals along the circumference of the flange portion 12 and pass through the flange portion 12 and the support plate 3.

[0074] from Figure 7 As can be seen, a copper bushing 15 may be provided inside the cavity of the central sleeve portion 11, and the telescopic positioning pin 2 extends through the copper bushing 15. The end of the copper bushing 15 may be provided with a buffer ring 16 for limiting and buffering. The flange 1 itself is fixedly connected to the support plate 3 through the flange portion 12. Specifically, the flange surface and the support plate surface are tightly connected by multiple flange fasteners arranged in a circle. The flange fasteners may include flange fixing bolts 13 and flange fixing pins 14 for positioning and locking connection.

[0075] Regarding machining requirements, it should be ensured that the outer peripheral surface of the flange 12 is perpendicular to the front surface of the support plate 3, so that the two can fit together and be fastened, keeping the flange 1 and the support plate 3 coaxial. That is, the machining of the flange step surface must ensure sufficient perpendicularity accuracy. In this embodiment, the step thickness of the flange 12 is not less than 25mm to ensure the strength of the bolt connection.

[0076] See Figure 3 , Figure 4 In this embodiment, the support plate 3 has a plurality of Y-direction connecting holes that are fastened to the reinforcing plate 100 along the Y direction and a Y-direction support plate connector 31 that passes through the Y-direction connecting holes one by one. The diameter of the Y-direction connecting hole is the sum of the outer diameter of the Y-direction support plate connector 31 and the radial adjustment allowance of the flange.

[0077] Because of the existence of a certain radial adjustment margin for the flange, the radial installation position of the support plate 3 can be finely adjusted, thereby driving the radial position of the flange 1 and the telescopic positioning pin 2 to be finely adjusted. In this embodiment, as an example, the support plate 3 of the bushing riveting and welding positioning mechanism is connected to the reinforcing plate 100 of the riveting and welding fixture by bolts (i.e., Y-direction support plate connector 31). The bolt mounting holes (i.e., Y-direction connection holes) on the support plate 3 are designed to have a radius 3mm larger than the corresponding threaded holes on the reinforcing plate 100, so as to ensure that the support plate 3 has an adjustment margin of at least 3mm on each side in the X and Z directions, which serves as the radial adjustment margin for the flange. The bolt installation adopts a connection method of spring washers and large flat washers to ensure the stability of the support plate position.

[0078] It should be noted that the Y direction defined in this paper is the axial direction of the telescopic positioning pin 2, while the X and Z directions are both radial directions of the telescopic positioning pin 2. The X and Z directions are perpendicular to each other, and they can define the cross-sectional directions of the telescopic positioning pin 2. Of course, as explained below, the X and Z directions are the side length directions of adjacent sides of the support plate 3, respectively.

[0079] Furthermore, in this embodiment, the support plate 3 is a rectangular plate and includes a first rectangular side extending along the X direction and a second rectangular side extending along the Z direction. See also Figure 3 , Figure 4 The bushing riveting and positioning mechanism 10 also includes:

[0080] X-direction support block 4 is installed on the second rectangular side of support plate 3 and its installation position along the X direction can be adjusted.

[0081] Z-direction support block 5 is installed on the first rectangular side of support plate 3 and its installation position along the Z direction is adjustable.

[0082] In the bushing riveting and positioning mechanism 10 of this embodiment, the flange 1 is bolted to the support plate 3, and Z-direction and X-direction support blocks are designed on the bottom and side of the support plate 3, respectively. By adjusting the distance between the support blocks and the side of the support plate 3, the position of the bushing riveting and positioning mechanism 10 in the X and Z directions can be adjusted.

[0083] In this embodiment, specifically, the X-direction support block 4 is connected to the second rectangular side of the support plate 3 via multiple X-direction support block connecting bolts 41 extending along the X direction, and a plurality of X-direction adjusting shims 42 are provided between the X-direction support block 4 and the second rectangular side; similarly, the Z-direction support block 5 is connected to the first rectangular side of the support plate 3 via multiple Z-direction support block connecting bolts 51 extending along the Z direction, and a plurality of Z-direction adjusting shims 52 are provided between the Z-direction support block 5 and the first rectangular side. Thus, by adding or removing adjusting shims, the distance between the support block and the side of the support plate 3 can be adjusted, thereby realizing the adjustment of the X-direction and Z-direction positions of the positioning mechanism.

[0084] Furthermore, both the rear end face of the X-direction support block 4 and the rear end face of the Z-direction support block 5 are provided with Y-direction support block connecting bolts and Y-direction support block connecting pins for connecting to the reinforcing plate 100 in the Y direction, for further positioning and locking connection. In this embodiment, the Z-direction and X-direction support blocks are connected to the reinforcing plate 100 by at least two fixing pins and two bolts. The Y-direction support block connecting bolts include a first Y-direction support block connecting bolt 43 acting on the X-direction support block 4 and a second Y-direction support block connecting bolt 53 acting on the Z-direction support block 5. The Y-direction support block connecting pins include a first Y-direction support block connecting pin 44 acting on the X-direction support block 4 and a second Y-direction support block connecting pin 54 acting on the Z-direction support block 5.

[0085] In addition, the bushing riveting and positioning mechanism 10 of this embodiment includes:

[0086] The pin drive mechanism 7 is used to drive the telescopic positioning pin 2 forward or backward.

[0087] The drive mechanism mounting plate 6 is connected between the pin drive mechanism 7 and the support plate 3;

[0088] The travel self-locking limit mechanism 8 is installed on the side of the drive mechanism mounting plate 6 and is used to limit the forward and backward movement of the telescopic positioning pin 2.

[0089] Specifically, the pin drive mechanism 7 can be a linear drive mechanism such as a cylinder. By setting a stroke self-locking limit mechanism 8, the stroke of the cylinder in the Y direction can be limited, and the positioning mechanism can be adjusted in the Y direction through the stroke self-locking limit mechanism 8. Through the above structural design, the bushing riveting and welding positioning mechanism 10 of this application can simultaneously achieve positional accuracy adjustment in the X, Y, and Z directions.

[0090] The travel self-locking limit mechanism 8 is used to limit the forward and backward movement of the telescopic positioning pin 2 in the Y direction, and can be various types of controllable telescopic stop mechanisms well known to those skilled in the art. In this embodiment, see... Figure 5 , Figure 6 A gasket-adjustable limiting mechanism was designed. The telescopic positioning pin 2 has a positioning pin 9 mounted at its front end and a radially protruding flange positioning part 21 formed at its rear end. The stroke self-locking limiting mechanism 8 of this embodiment includes:

[0091] Limit drive mechanism 81; and

[0092] Y-direction limiting block 82 is used to extend into the support plate 3 and the flange positioning part 21 of the telescopic positioning pin 2 for limiting under the drive of the limiting drive mechanism 81.

[0093] The Y-direction limiting block 82 is provided with several limiting adjustment shims 83 for adjusting the position of the limiting block.

[0094] In this embodiment, such as Figure 5 , Figure 6 As shown, the limit drive mechanism 81 adopts a linear drive mechanism such as a cylinder. The cylinder is mounted on the mounting plate, and the cylinder piston rod passes through the mounting plate and connects to the limit block mounting plate 85. A Y-axis limit block 82 is mounted on the limit block mounting plate 85. (See also...) Figure 6 Driven by the cylinder, the cylinder piston rod can drive the Y-axis limiting block 82 to translate in the X-axis, thereby stopping the flange positioning part 21 of the telescopic positioning pin 2 or disengaging the two from interference. To maintain the smoothness of the cylinder piston rod drive, a guide rod 84 is also installed between the limiting block mounting plate 85 and the cylinder mounting plate. The position of the limiting block can be adjusted according to the specific application environment by adding or removing the limiting adjustment shims 83.

[0095] This embodiment incorporates a travel self-locking limit mechanism 8 between the tail end step of the telescopic positioning pin 2 and the support plate 3, which is mounted on the drive mechanism mounting plate 6. Figure 6As shown, the extension and retraction of the limit block driven by the cylinder restricts the stroke of the tail cylinder, thereby limiting the Y-axis position of the tooling. In actual production, the positional accuracy of the tooling in the Y-axis can be optimized by adjusting the number of shims and the position of the limit block.

[0096] In summary, in the bushing riveting and positioning mechanism 10 of this application, the bottom and sides of the support plate are respectively designed with Z-axis and X-axis support blocks. Adjusting shims are installed between the support plate and the support blocks. The tooling can be adjusted in both the X and Z directions by increasing or decreasing the number of adjusting shims between the support plate and the support blocks. A stroke self-locking limit mechanism 8 is set between the tail end of the telescopic positioning pin shaft and the support plate, which can limit the stroke of the cylinder in the Y direction. The tooling can be adjusted in the Y direction by adjusting the number of shims. Moreover, the bolt mounting holes on the support plate are designed to be several mm larger in radius than the threaded holes on the corresponding reinforcing plate 1, which can ensure that the support plate has a certain adjustment margin on one side in the X and Z directions. The bolt installation adopts a connection method of spring washers and large flat washers, which can ensure the stability of the support plate position.

[0097] Based on the aforementioned bushing riveting and positioning mechanism 10, this application also discloses a scissor arm bushing riveting and welding fixture, comprising:

[0098] The tooling frame 200 includes a rectangular tube clamping portion for clamping the rectangular tube workpiece 104 and a plurality of reinforcing plates 100 symmetrically arranged on both sides of the rectangular tube clamping portion; and

[0099] Multiple bushing riveting and positioning mechanisms 10 are used to weld and position the two ends of the bushing workpiece.

[0100] Among them, the support plate 3 is fastened to the reinforcing plate 100, and the telescopic positioning pin 2 extends through the reinforcing plate 100 to the end of the bushing workpiece.

[0101] For scissor lift aerial work platforms, the scissor arm typically consists of a rectangular tube workpiece 104 and several bushing workpieces. Figure 8 As an example, the scissor lift includes three bushing workpieces: a first bushing workpiece 101, a second bushing workpiece 102, and a third bushing workpiece 103. The tooling frame 200 has a rectangular tube clamping part for fixing and clamping a rectangular tube workpiece 104. When riveting and welding the two ends of each of the three bushing workpieces into the shaft holes in the square tubes on both sides of the rectangular tube workpiece 104, it is necessary to ensure the parallelism of the three bushing workpieces. Therefore, the six bushing riveting and positioning mechanisms 10 shown in the figure are used. The positioning pins 9 at the front end of each positioning mechanism are used to support and position the ends of the bushing workpieces. After ensuring parallelism, the riveting operation is then performed.

[0102] The bushing riveting and positioning mechanism 10 of this application, when installed on the reinforcing plate 100, can adjust the position of the positioning pin 9 in three dimensions, thereby meeting the parallelism requirements of the three bushing workpieces, and does not require higher requirements for the machining accuracy of the shaft holes on the reinforcing plate 100. In comparison, the existing scissor lift bushing riveting and positioning mechanism cannot adjust the positional accuracy in the X and Z directions, and cannot optimize the accuracy of the scissor lift structural components according to actual production conditions, resulting in poor adjustability of tooling accuracy; moreover, the positional accuracy of each bushing of the scissor lift is mainly guaranteed by machining six shaft holes as a whole, resulting in high machining costs; in addition, the flange embedded in the frame has an interference fit requirement with the shaft holes, requiring high machining accuracy for the outer surface of the flange. Furthermore, the tooling accuracy of the existing scissor lift bushing riveting and positioning mechanism is mainly guaranteed by the machined shaft holes on the tooling frame. After the tooling wears out during use, in order to optimize the tooling accuracy, the tooling frame needs to be filled and welded as a whole and then machined, resulting in high tooling repair and maintenance costs.

[0103] The bushing riveting and positioning mechanism 10 of this application effectively solves the aforementioned problems. The flange 1 can be fitted into the flange mounting hole on the reinforcing plate 100 with a clearance fit, and the radial position of the flange 1 can be easily adjusted by the support plate 3. The scissor lift bushing riveting and welding fixture of this application does not require precision machining of multiple bushing holes using equipment such as boring machines, simplifying the fixture manufacturing process, shortening the fixture manufacturing cycle, and reducing the fixture manufacturing cost. The flange outer surface precision requirement of the bushing riveting and welding positioning mechanism is reduced, greatly reducing the fixture manufacturing cost; the scissor lift bushing riveting and welding fixture can adjust the positional accuracy of the fixture in both the X, Y, and Z directions by adjusting shims, enabling faster and more convenient optimization of the fixture accuracy according to actual production conditions, thereby improving the precision of structural components. When the tooling accuracy of the original scissor lift bushing riveting fixture becomes abnormal and cannot be adjusted, the entire fixture frame must be disassembled for machining to optimize the tooling accuracy. The subsequent accuracy maintenance cost of the fixture is high. However, the scissor lift bushing riveting fixture of this application only requires adjustment of the relevant shims as needed, simplifying the tooling accuracy maintenance process and greatly reducing the tooling maintenance cost.

[0104] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0105] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0106] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0107] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A bushing riveting and positioning mechanism, characterized in that, The bushing riveting and positioning mechanism (10) includes: Flange (1), wherein a telescopic positioning pin (2) is inserted inside the flange (1); Support plate (3) is used to be installed on the reinforcing plate (100) of the bushing riveting fixture. The support plate (3) is fitted on the telescopic positioning pin (2). The front plate surface of the support plate (3) is tightly installed in axial fit with the axial tail end surface of the flange (1). The support plate (3) is fastened to the reinforcing plate (100), and the telescopic positioning pin (2) extends through the reinforcing plate (100) to the end of the bushing workpiece so that the front plate surface of the support plate (3) fits against the rear plate surface of the reinforcing plate (100). The flange (1) is fitted into the flange mounting hole on the reinforcing plate (100) with clearance fit. The radial position of the flange (1) can be adjusted by the support plate (3). The telescopic positioning pin (2) is set through the reinforcing plate (100). The telescopic positioning pin (2) has a radially protruding flange positioning part (21) at its tail end. The bushing riveting positioning mechanism (10) includes a stroke self-locking limit mechanism (8). The stroke self-locking limit mechanism (8) includes a Y-direction limit block (82), which is used to extend between the support plate (3) and the flange positioning part (21) of the telescopic positioning pin (2) for limiting the position. The Y-direction limit block (82) is provided with several limit adjustment shims (83) for adjusting the position of the limit block.

2. The bushing riveting and positioning mechanism according to claim 1, characterized in that, The flange (1) includes: The central sleeve (11) is coaxially sleeved on the telescopic positioning pin (2); The flange (12) is located at the tail end of the central sleeve (11) and expands radially outward; Multiple flange fasteners are arranged circumferentially along the flange portion (12) and pass through the flange portion (12) and the support plate (3).

3. The bushing riveting and positioning mechanism according to claim 2, characterized in that, The flange fasteners include flange fixing bolts (13) and flange fixing pins (14); and / or, the outer peripheral surface of the flange (12) is perpendicular to the front plate surface of the support plate (3).

4. The bushing riveting and positioning mechanism according to any one of claims 1 to 3, characterized in that, The support plate (3) has a plurality of Y-direction connecting holes that are fastened to the reinforcing plate (100) along the Y direction and a Y-direction support plate connector (31) that passes through the Y-direction connecting holes one by one. The diameter of the Y-direction connecting hole is the sum of the outer diameter of the Y-direction support plate connector (31) and the radial adjustment allowance of the flange.

5. The bushing riveting and positioning mechanism according to claim 4, characterized in that, The radial adjustment margin of the flange (1) shall not be less than 3mm.

6. The bushing riveting and positioning mechanism according to any one of claims 1 to 3, characterized in that, The support plate (3) is a rectangular plate and includes a first rectangular side extending along the X direction and a second rectangular side extending along the Z direction. The bushing riveting and positioning mechanism (10) further includes: The X-direction support block (4) is installed on the second rectangular side of the support plate (3) and its installation position along the X direction is adjustable. The Z-direction support block (5) is installed on the first rectangular side of the support plate (3) and its installation position along the Z direction is adjustable.

7. The bushing riveting and positioning mechanism according to claim 6, characterized in that, The X-direction support block (4) is connected to the second rectangular side of the support plate (3) by a plurality of X-direction support block connecting bolts (41) extending along the X direction, and a plurality of X-direction adjustment shims (42) are provided between the X-direction support block (4) and the second rectangular side. Furthermore, the Z-direction support block (5) is connected to the first rectangular side of the support plate (3) by a plurality of Z-direction support block connecting bolts (51) extending along the Z direction, and a plurality of Z-direction adjustment shims (52) are provided between the Z-direction support block (5) and the first rectangular side.

8. The bushing riveting and positioning mechanism according to claim 6, characterized in that, The rear end face of the X-direction support block (4) and the rear end face of the Z-direction support block (5) are provided with Y-direction support block connecting bolts and Y-direction support block connecting pins for connecting to the reinforcing plate (100) in the Y direction.

9. The bushing riveting and positioning mechanism according to any one of claims 1 to 3, characterized in that, The bushing riveting and positioning mechanism (10) includes: The pin drive mechanism (7) is used to drive the telescopic positioning pin (2) forward or backward; The drive mechanism mounting plate (6) is connected between the pin drive mechanism (7) and the support plate (3); The stroke self-locking limit mechanism (8) is installed on the side of the drive mechanism mounting plate (6) and is used to limit the forward and backward movement of the telescopic positioning pin (2).

10. The bushing riveting and positioning mechanism according to claim 9, characterized in that, The telescopic positioning pin (2) is equipped with a positioning pin (9) at its front end; the travel self-locking limit mechanism (8) includes: Limit drive mechanism (81); and Y-direction limiting block (82) is used to extend into the support plate (3) and the flange positioning part (21) of the telescopic positioning pin (2) under the drive of the limiting drive mechanism (81) to limit the movement.

11. A scissor lift arm bushing riveting and welding fixture, wherein the scissor lift arm includes a rectangular tube workpiece (104) and several bushing workpieces (101~103), characterized in that, The scissor arm bushing riveting and welding fixture includes: The tooling frame (200) includes a rectangular tube clamping portion for clamping the rectangular tube workpiece (104) and a plurality of reinforcing plates (100) symmetrically arranged on both sides of the rectangular tube clamping portion; and Multiple bushing riveting and positioning mechanisms (10) according to any one of claims 1 to 10 are used to weld and position the two ends of the bushing workpiece (101 to 103).

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