Welded frame overturning seat positioning mechanism and positioning method

Abstract

The invention provides a welding type frame overturning seat positioning mechanism and a positioning method. The welding type frame overturning seat positioning mechanism comprises a bottom plate, a transverse feeding mechanism, a multi-degree-of-freedom adjusting mechanism and an expansion pin self-centering mechanism. The expansion pin self-centering mechanism is used for being connected with an inner sleeve of the welding type frame overturning seat assembly; the multi-degree-of-freedom adjusting mechanisms are respectively arranged below the expansion pin self-centering mechanisms and are used for adjusting the angles of the expansion pin self-centering mechanisms in a multi-degree-of-freedom manner; the transverse feeding mechanism is arranged below the multi-degree-of-freedom adjusting mechanism and is used for transversely adjusting the position of the expansion pin self-centering mechanism; the bottom plate is arranged below the transverse feeding mechanism and used for supporting the transverse feeding mechanism. According to the mechanism and the method, the positioning precision of the frame overturning seat can be improved, and parts can be efficiently and accurately positioned.

Description

Technical Field

[0001] The present invention belongs to the technical field of the production of dump truck frames, and particularly relates to a positioning mechanism and a positioning method for a welding type frame turnover seat. Background Art

[0002] In a welded frame, especially in the frame of a dump truck, as Figure 1 shown, the turnover seat assembly belongs to a key part, which bears the cargo box and is responsible for the actions related to the lifting of the cargo box. The welding quality and dimensional accuracy requirements are extremely high. The current production process is as follows: Spot welding process: As Figure 2 shown, the turnover seat is placed on a tooling (positioning mechanism), and the position of the part is adjusted manually in an indefinite quantity to ensure the relevant dimensions and assembly gaps after spot welding. The accuracy can be guaranteed within ±1 mm.

[0003] Welding process: The production uses a robot to perform multi-layer and multi-pass welding on this area. The welding sequence and welding parameters are controllable, and the post-welding deformation law is stable. The dimensional shrinkage error is 1 mm.

[0004] After a large number of production verifications, there is a 3 mm error band (the inspection result is A±1.5 mm) in the dimensions at the turnover seat after the overall welding of the frame, which does not meet the design requirements (A±1 mm). The unqualified rate is about 30%. The repair process is relatively difficult and the production difficulty is high.

[0005] Since the welded frame is less used in the industry, there is no relevant experience to draw on. There is no corresponding device or equipment to solve this problem. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a positioning mechanism and a positioning method for a welding type frame turnover seat, which are used to improve the positioning accuracy of the frame turnover seat and can accurately position the parts efficiently.

[0007] To achieve the above object / to solve the above technical problems, the present invention is implemented by the following technical solutions: The present invention provides a positioning mechanism for a welding type frame turnover seat, which includes a bottom plate, a transverse feeding mechanism, a multi-degree-of-freedom adjustment mechanism, and a expandable pin self-centering mechanism.

[0008] The expandable pin self-centering mechanism is used to connect with the inner sleeve of the welding type frame turnover seat assembly.

[0009] The multi-degree-of-freedom adjustment mechanism is respectively arranged below the expandable pin self-centering mechanism and is used to adjust the angle of the expandable pin self-centering mechanism in multiple degrees of freedom.

[0010] The transverse feeding mechanism is arranged below the multi-degree-of-freedom adjustment mechanism and is used to adjust the position of the expandable pin self-centering mechanism transversely.

[0011] The bottom plate is arranged below the transverse feeding mechanism and is used to provide support for the transverse feeding mechanism.

[0012] Furthermore, the transverse feeding mechanism includes a guide rail, a slider, a limit block, and a sliding plate.

[0013] The guide rail is arranged on the bottom plate.

[0014] The sliding plate is slidably connected to the guide rail through the slider.

[0015] The sliding plate can be fixedly connected to the multi-degree-of-freedom adjustment mechanism.

[0016] The limit block is arranged at the end of the guide rail and is used to limit the traveling range of the sliding plate.

[0017] The technical effects achieved by the above settings are as follows: The bottom plate is located at the bottom of the fixture assembly and is connected to the guide rail of the transverse feeding mechanism by means of pins, serving as the foundation of the overall mechanism. The transverse feeding mechanism consists of a guide rail, a slider, a limit block, and a sliding plate, and the whole is connected by pins, serving as the execution structure for the transverse movement.

[0018] Furthermore, the guide rail is fixedly connected to the bottom plate by pins.

[0019] Furthermore, there are at least two expanding pin self-centering mechanisms.

[0020] The numbers of the multi-degree-of-freedom adjustment mechanism, the slider, and the sliding plate are the same as the number of the expanding pin self-centering mechanisms.

[0021] A multi-degree-of-freedom adjustment mechanism is connected to the bottom of each expanding pin self-centering mechanism. Each multi-degree-of-freedom adjustment mechanism is slidably connected to the guide rail through the sliding plate and the slider, so as to horizontally adjust the distance between the expanding pin self-centering mechanisms.

[0022] Furthermore, the multi-degree-of-freedom adjustment mechanism includes a Y-direction position connecting block, a Y-direction position adjusting block, a Z-direction position connecting block, a Z-direction position adjusting block, a Z-direction angle adjusting block, a Y-direction angle adjusting block, and a cylinder connecting plate; the Y-direction refers to the direction perpendicular to the movement of the transverse feeding mechanism within the plane of the bottom plate; the Z-direction refers to the direction perpendicular to the plane of the bottom plate. The Y-direction position connecting block is connected to the sliding plate, and a Z-direction angle rotation center with an axis direction of the Z-direction is arranged on its top surface.

[0023] The Y-direction position adjustment block is fixedly arranged on the sliding plate, and an installation hole arranged in the Y direction is formed on its side surface. A fixing hole matching the installation hole is formed on the side surface of the Y-direction position connection block. The Y-direction position adjustment block is fixedly connected to the Y-direction position connection block through a pin shaft penetrating through the installation hole and the fixing hole. A Y-direction position adjustment gasket is arranged between the installation hole and the fixing hole. The Y-direction position of the expansion pin self-centering mechanism is adjusted by adjusting the thickness and quantity of the Y-direction position adjustment gasket.

[0024] The Z-direction position adjustment block is rotationally connected to the Y-direction position connection block through the Z-direction angle rotation center. A Z-direction position adjustment gasket is arranged between the Z-direction position adjustment block and the Y-direction position connection block. The vertical distance between the Z-direction position adjustment block and the Y-direction position connection block is adjusted by adjusting the thickness and quantity of the Z-direction position adjustment gasket, and further the Z-direction position of the expansion pin self-centering mechanism is adjusted.

[0025] The Z-direction angle adjustment block is arranged on the top surface of the Y-direction position connection block and abuts against the Z-direction position adjustment block through a Z-direction angle adjustment gasket. Thus, the Z-direction position adjustment block is rotated by adjusting the thickness and quantity of the Z-direction angle adjustment gasket, and further the Z-direction angle of the expansion pin self-centering mechanism is adjusted.

[0026] The Z-direction position connection block is fixedly connected to the Z-direction angle adjustment block, and a Y-direction angle rotation center with the axis direction in the Y direction is arranged thereon.

[0027] The cylinder connection plate is rotationally arranged on the Z-direction angle connection block through the Y-direction angle rotation center. A Y-direction angle adjustment block is fixedly arranged thereon. The Y-direction angle adjustment block abuts against the cylinder connection plate through a Y-direction angle adjustment gasket. Thus, the cylinder connection plate is rotated by adjusting the thickness and quantity of the Y-direction angle adjustment gasket. The cylinder connection plate is used for fixedly connecting the expansion pin self-centering mechanism, and the rotation of the cylinder connection plate further drives the change of the Y-direction angle of the expansion pin self-centering mechanism.

[0028] Furthermore, a long circular hole in the Y direction is formed on the Y-direction position connection block and is connected to the sliding plate through the long circular hole and a fixing pin.

[0029] An annular through hole is formed on the Z-direction position adjustment block and is connected to the Y-direction position connection block through the annular through hole and a fixing pin.

[0030] The technical effects achieved by the above settings: A long circular hole in the Y direction is formed on the Y-direction position connection block and is connected to the sliding plate through the long circular hole and a fixing pin, so that the Y-direction position connection block can move in the Y direction within a short distance. Similarly, a short annular through hole is formed on the Z-direction position adjustment block and is connected to the Y-direction position connection block through the short annular through hole and a fixing pin, so that the Z-direction position adjustment block rotates by a certain angle.

[0031] Furthermore, the expanding pin self-centering mechanism includes a cylinder, a connecting seat, a guiding seat, and a positioning wedge block.

[0032] The connecting seat is used to connect the multi-degree-of-freedom adjustment mechanism.

[0033] The guiding seat is arranged inside the connecting seat and can reciprocate along the axis of the connecting seat. One end of the guiding seat is connected to the output shaft of the cylinder, and the other end is provided with a wedge block. The positioning wedge block is slidably arranged on the connecting seat in the radial direction. A bevel surface is provided at one end close to the inner diameter of the guiding seat. The bevel surface of the positioning wedge block is in sliding fit with the inclined surface of the wedge block, so as to convert the axial movement of the guiding seat into radial movement.

[0034] The cylinder is installed on the connecting seat. The cylinder drives the positioning wedge block to eject outwards through the guiding seat, so as to realize the function of inner sleeve circle positioning.

[0035] Furthermore, there are multiple groups of the positioning wedge blocks, and the multiple groups of wedge blocks are arranged in an equally divided circle.

[0036] The technical effects achieved by the above settings are as follows: The simultaneous movement of multiple groups of wedge blocks can realize the self-centering circle function, so as to realize the inner sleeve circle positioning function of the flipping seat.

[0037] Furthermore, the outer side of the positioning wedge block is connected with a positioning wedge block gasket through a pin. The positioning wedge block gasket is generally made of silicone material, which can increase the friction with the inner sleeve and prevent wear.

[0038] In the second aspect, the present invention provides a positioning method for a welded frame flipping seat, based on the positioning mechanism of the welded frame flipping seat described in the first aspect, including the following steps: Displace the expanding pin self-centering mechanism to the vicinity of the inner sleeve of the flipping seat assembly through the transverse feeding mechanism.

[0039] Adjust the position of the expanding pin self-centering mechanism through the multi-degree-of-freedom adjustment mechanism, so that the expanding pin self-centering mechanism extends into the inner sleeve of the flipping seat assembly.

[0040] Start the expanding pin self-centering mechanism, make it fit with the inner sleeve of the flipping seat assembly, and complete the positioning work.

[0041] Compared with the prior art, the beneficial effects achieved by the present application include: 1. Displace the expanding pin self-centering mechanism to the vicinity of the inner sleeve of the flipping seat assembly through the transverse feeding mechanism. Adjust the position of the expanding pin self-centering mechanism through the multi-degree-of-freedom adjustment mechanism, so that the expanding pin self-centering mechanism extends into the inner sleeve of the flipping seat assembly. Start the expanding pin self-centering mechanism, make it fit with the inner sleeve, and complete the positioning work. Through the adjustment of multiple degrees of freedom and high-precision adjustment, high-precision part positioning can be realized, meeting the precision requirements.

[0042] 2. After precise positioning through the mechanism, the dotting improves the first-pass production qualification rate of the frame, enhances the production quality and reduces the production cost.

[0043] 3. It can be quickly replaced as a whole. For the turnover seats with different precisions and sizes, the production adjustment time can be reduced, and the post-welding machining process of the welded frame turnover seat can be reduced, realizing production cost reduction. Description of the Drawings

[0044] Figure 1 It is a schematic diagram of the welded frame.

[0045] Figure 2 It is a schematic diagram of the original positioning tooling for the turnover seat.

[0046] Figure 3 It is a schematic diagram of the working of the positioning mechanism.

[0047] Figure 4 It is the overall drawing of the positioning mechanism.

[0048] Figure 5 It is a schematic diagram of the bottom plate.

[0049] Figure 6 It is the overall drawing of the transverse feeding mechanism.

[0050] Figure 7 It is the detailed drawing of the transverse feeding mechanism.

[0051] Figure 8 It is a schematic diagram of multi-degree-of-freedom adjustment.

[0052] Figure 9 It is a schematic diagram of the expanding pin self-centering mechanism.

[0053] Figure 10 It is a sectional view of the expanding pin self-centering mechanism.

[0054] In the figure: 0, turnover seat positioning mechanism; 1, turnover seat assembly.

[0055] 01, bottom plate; 02, transverse feeding mechanism; 03, multi-degree-of-freedom adjustment mechanism; 04, expanding pin self-centering mechanism.

[0056] 0201, guide rail; 0202, slider; 0203, limit block; 0204, sliding plate.

[0057] 0301, Y-direction position connecting block; 0302, Y-direction position adjusting block; 0302-1, Y-direction position adjusting gasket; 0303, Z-direction position adjusting block; 0303-1, Z-direction position adjusting gasket; 0304, Z-direction angle adjusting block; 0304-1, Z-direction angle adjusting gasket; 0305, Z-direction angle rotation center; 0306, Y-direction angle adjusting block; 0306-1, Y-direction angle adjusting gasket; 0307, Y-direction angle rotation center; 0308, cylinder connecting plate; 0309, Z-direction position connecting block.

[0058] 0401, cylinder; 0402, connecting seat; 0403, guiding seat; 0404, positioning wedge block; 0405, positioning wedge block gasket. Detailed implementation mode

[0059] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention.

[0060] In the description of this embodiment, it should be noted that when terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this embodiment. Embodiment 1

[0061] This embodiment provides a positioning mechanism 0 for a welded frame flipping seat, as Figure 3 and Figure 4 shown, which includes a bottom plate 01, a transverse feeding mechanism 02, a multi-degree-of-freedom adjustment mechanism 03, and a pin expanding self-centering mechanism 04.

[0062] The pin expanding self-centering mechanism 04 is used to connect with the inner sleeve of the welded frame flipping seat assembly 1.

[0063] The multi-degree-of-freedom adjustment mechanism 03 is respectively arranged below the pin expanding self-centering mechanism 04 and is used to adjust the angle of the pin expanding self-centering mechanism 04 in multiple degrees of freedom.

[0064] The transverse feeding mechanism 02 is arranged below the multi-degree-of-freedom adjustment mechanism 03 and is used to transversely adjust the position of the pin expanding self-centering mechanism 04.

[0065] The bottom plate 01 is arranged below the transverse feeding mechanism 02 and is used to provide support for the transverse feeding mechanism 02.

[0066] During use, the expansion pin self-centering mechanism 04 is displaced to the vicinity of the inner sleeve of the flipping seat assembly 1 by the lateral feeding mechanism 02. The position of the expansion pin self-centering mechanism 04 is adjusted by the multi-degree-of-freedom adjustment mechanism 03 so that the expansion pin self-centering mechanism 04 extends into the inner sleeve of the flipping seat assembly 1. The expansion pin self-centering mechanism 04 is started to fit with the inner sleeve to complete the positioning work.

[0067] Through this mechanism, high-precision part positioning can be achieved to meet the accuracy requirements. Embodiment 2

[0068] Based on the same principle as Embodiment 1, this embodiment provides a positioning mechanism 0 for a welded frame flipping seat, which is used to improve the positioning accuracy of the frame flipping seat, can position parts efficiently and accurately, and meet the dimensional adjustment at the 0.1 mm level.

[0069] As Figure 3 shown, a positioning mechanism 0 for a welded frame flipping seat provided by the present invention includes a base plate 01, a lateral feeding mechanism 02, a multi-degree-of-freedom adjustment mechanism 03, and an expansion pin self-centering mechanism 04 (at least two).

[0070] The expansion pin self-centering mechanism 04 is used to connect with the pin hole of the welded frame flipping seat assembly 1.

[0071] A plurality of multi-degree-of-freedom adjustment mechanisms 03 are respectively arranged below each expansion pin self-centering mechanism 04 for adjusting the angles of the respective expansion pin self-centering mechanisms 04 in multiple degrees of freedom.

[0072] The lateral feeding mechanism 02 is arranged below the multi-degree-of-freedom adjustment mechanism 03 for laterally adjusting the distance between the two expansion pin self-centering mechanisms 04.

[0073] The base plate 01 is arranged below the lateral feeding mechanism 02 for providing support for the lateral feeding mechanism 02.

[0074] As Figure 5 shown, the base plate 01: is located at the bottom of the fixture assembly and is connected to the guide rail 0201 of the lateral feeding mechanism 02 by pinning, serving as the basis of the overall mechanism.

[0075] As Figure 6 and Figure 7 shown, the lateral feeding mechanism 02 is composed of a guide rail 0201, a slider 0202, a limit block 0203, and a sliding plate 0204, and is integrally connected by pins, serving as the execution structure for lateral movement.

[0076] The guide rail 0201 is fixedly connected to the base plate 01 by pins. The sliding plate 0204 is slidably connected to the guide rail 0201 through the slider 0202. The sliding plate 0204 can be fixedly connected to the multi-degree-of-freedom adjustment mechanism 03. The limit block 0203 is arranged at the end of the guide rail 0201 to limit the travel range of the slide.

[0077] As Figure 8 shown, the multi-degree-of-freedom adjustment mechanism 03: consists of a Y-direction position adjustment block 0302, a Z-direction position adjustment block 0303, a Z-direction angle adjustment block 0304, and a Y-direction angle adjustment block 0306, and is integrally connected by pins and adjusted by gaskets.

[0078] The multi-degree-of-freedom adjustment mechanism 03 specifically includes a Y-direction position adjustment block 0302, a Y-direction position connection block 0301, a Z-direction position adjustment block 0303, a Z-direction angle adjustment block 0304, a Y-direction position adjustment block 0302, a Y-direction angle adjustment block 0306, and a cylinder connection plate 0308. The Y direction refers to the direction perpendicular to the movement of the transverse feeding mechanism 02 within the plane of the base plate 01. The Z direction refers to the direction perpendicular to the plane of the base plate 01.

[0079] The Y-direction position connection block 0301 can be optionally connected to the sliding plate 0204 by pins or shaft pins to maintain a certain degree of mobility.

[0080] The Y-direction position adjustment block 0302 is fixedly connected to the sliding plate 0204 by pins or shaft pins. The Y-direction position adjustment block 0302 is fixedly connected to the Y-direction position connection block 0301. There are mounting holes arranged along the Y direction on its side surface, and fixing holes matching the mounting holes are arranged on the side surface of the Y-direction position connection block 0301. The Y-direction position adjustment block 0302 is fixedly connected to the Y-direction position connection block 0301 by shaft pins passing through the mounting holes and the fixing holes. A Y-direction position adjustment gasket 0302-1 is arranged between the mounting hole and the fixing hole. The Y-direction position adjustment block 0302 moves the Y-direction position connection block 0301 by adjusting the thickness and quantity of the Y-direction position adjustment gasket 0302-1, and further adjusts the Y-direction position of the expansion pin self-centering mechanism 04.

[0081] The Y-direction position connection block 0301 is integrally in a dish shape, and there is a convex platform arranged thereon through two vertical plates. The upper top surface of the convex platform is provided with a Z-direction angle rotation center 0305 with the axis direction in the Z direction.

[0082] The Z - direction position adjustment block 0303 is rotationally connected to the Y - direction position connection block 0301 through the Z - direction angle rotation center 0305. A Z - direction position adjustment gasket 0303 - 1 is provided between the Z - direction position adjustment block 0303 and the Y - direction position connection block 0301. By adjusting the thickness and quantity of the Z - direction position adjustment gasket 0303 - 1, the vertical distance between the Z - direction position adjustment block 0303 and the Y - direction position connection block 0301 is adjusted, and further the Z - direction position of the expanding pin self - centering mechanism 04 is adjusted.

[0083] The Z - direction angle adjustment block 0304 is arranged on the convex platform on the top surface of the Y - direction position connection block 0301 and abuts against the Z - direction position adjustment block 0303 through the Z - direction angle adjustment gasket 0304 - 1. Thus, by adjusting the thickness and quantity of the Z - direction angle adjustment gasket 0304 - 1, the Z - direction position adjustment block 0303 is rotated, and further the Z - direction angle of the expanding pin self - centering mechanism 04 is adjusted.

[0084] The Z - direction position connection block 0309 is in the shape of a strip board and is fixedly connected to the Z - direction angle adjustment block 0304 with its normal direction being the Y - direction. It is provided with a Y - direction angle rotation center 0307 with the axis direction being the Y - direction.

[0085] The cylinder connection plate 0308 is rotationally arranged on the Z - direction angle connection block through the Y - direction angle rotation center 0307. A Y - direction angle adjustment block 0306 is fixedly arranged thereon. The Y - direction angle adjustment block 0306 abuts against the cylinder connection plate 0308 through the Y - direction angle adjustment gasket 0306 - 1. Thus, by adjusting the thickness and quantity of the Y - direction angle adjustment gasket 0306 - 1, the cylinder connection plate 0308 is rotated. The cylinder connection plate 0308 is used for fixedly connecting the expanding pin self - centering mechanism 04, and the rotation of the cylinder connection plate 0308 drives the Y - direction angle of the expanding pin self - centering mechanism 04.

[0086] The Y - direction angle adjustment method can also be the same as the Z - direction angle adjustment method. The Y - direction angle adjustment block 0306 is fixed on the Z - direction position connection block 0309, and the rotatable cylinder connection plate 0308 is abutted through a gasket, thereby pushing the cylinder connection plate 0308 to drive the expanding pin self - centering mechanism 04 to rotate.

[0087] In addition, as Figure 8 shown, the Y - direction position connection block 0301 is provided with a long circular hole in the Y - direction and is connected to the sliding plate 0204 through the long circular hole and a fixing pin, so as to realize that the Y - direction position connection block 0301 can move along the Y - direction within a short distance on the sliding plate 0204. Similarly, the Z - direction position adjustment block 0303 is provided with a short annular through - hole, and is connected to the Y - direction position connection block 0301 through the short annular through - hole and a fixing pin, so that the Z - direction position adjustment block 0303 rotates a certain angle.

[0088] The thickness types of shims such as the Y-direction position adjustment shim 0302-1, the Y-direction angle adjustment shim 0306-1, the Z-direction position adjustment shim 0303-1, and the Z-direction angle adjustment shim 0304-1 are 4 types, which are 1 / 0.5 / 0.3 / 0.1 mm respectively, and are matched according to requirements during actual use.

[0089] When adjusting the linear dimension, just increase or decrease the shims as needed.

[0090] When adjusting the angular dimension, the theoretical basis for angle adjustment: △H≈L=(2πRn) / 360, where △H is the adjustment height, L is the arc length, π is the pi, R is the torque (the distance from the center point to the turning point), and n is the adjustment angle. This mechanism can achieve a 0.1 mm increase or decrease of the shim and a 0.1° angle adjustment by setting the rotation radius.

[0091] Through the above settings, the multi-degree-of-freedom adjustment mechanism 03 realizes quantitative adjustment of 4 degrees of freedom, with an adjustment range of 3 mm and a minimum adjustment accuracy of 0.1 mm.

[0092] Such as Figure 9 and Figure 10 shown, the expansion pin self-centering mechanism 04 includes a cylinder 0401, a connecting seat 0402, a guide seat 0403, and a positioning wedge 0404.

[0093] The connecting seat 0402 is used to connect the multi-degree-of-freedom adjustment mechanism 03.

[0094] The guide seat 0403 is arranged inside the connecting seat 0402 and can reciprocate along the axis direction of the connecting seat 0402. One end of it is connected to the output shaft of the cylinder 0401, and the other end is provided with a wedge block. The positioning wedge 0404 is radially slidably arranged on the connecting seat 0402, and a bevel surface is provided at one end close to the inner diameter of the guide seat 0403. The bevel surface of the positioning wedge 0404 and the inclined surface of the wedge block are slidably fitted, so as to convert the axial movement of the guide seat 0403 into radial movement.

[0095] The guide seat 0403 in this embodiment is integrally in the shape of a long rod, and the positioning wedge 0404 is ejected through a wedge-shaped structure. In other feasible ways, other ejection mechanisms can also be used.

[0096] Such as Figure 9 shown, the positioning wedge 0404 is nested and connected in the connecting seat 0402. The positioning wedge 0404 is in multiple groups, preferably 4 groups. The multiple groups of wedges are arranged in an equally divided circle, and the simultaneous movement of the multiple groups of wedges can achieve the self-centering circle function.

[0097] The cylinder 0401 is installed on the connecting seat 0402. The cylinder 0401 drives the positioning wedge 0404 to eject outward through the guide seat 0403, so as to achieve the inner circle positioning function.

[0098] The axial movement of the guide rod of the cylinder 0401 is converted into the normal movement (radial movement) of the positioning wedge 0404 through the guide seat 0403. Four groups of wedges are arranged in an equally divided circle. The simultaneous movement of the four groups of wedges can achieve the self - centering circle function and realize the inner - circle positioning function of the flipping seat.

[0099] Preferably, a positioning wedge gasket 0405 is connected to the outside of the positioning wedge 0404 by a pin. The positioning wedge gasket 0405 is generally made of silicone material, which can increase the friction with the inner sleeve and prevent wear.

[0100] Usage process: 1. Push the unilateral transverse feeding mechanism 02 to displace the expansion pin into the inside of the flipping seat (when feeding, the built - in stop block will position the overall mechanism).

[0101] 2. Start the expansion pin cylinder 0401, and the 4 groups of positioning wedges 0404 eject. The outer positioning surface of the positioning wedge 0404 fits with the inner sleeve of the flipping seat to complete the positioning work. The working processes on the left and right sides are the same. Embodiment 3

[0102] This embodiment provides a positioning method for the welding - type vehicle frame flipping seat, based on the positioning mechanism 0 of the welding - type vehicle frame flipping seat in Embodiment 2, including the following steps: Displace the expansion pin self - centering mechanism 04 to the vicinity of the inner sleeve of the flipping seat assembly 1 through the transverse feeding mechanism 02.

[0103] Adjust the position of the expansion pin self - centering mechanism 04 through the multi - degree - of - freedom adjustment mechanism 03 so that the expansion pin self - centering mechanism 04 extends into the inner sleeve of the flipping seat assembly 1.

[0104] Start the expansion pin self - centering mechanism 04 to make the outer positioning surface of the positioning wedge 0404 fit with the inner sleeve to complete the positioning work.

[0105] Spot - welding process: Place the flipping seat on the tooling, adjust the part position in a quantitative manner to ensure the relevant dimensions and assembly gaps after spot - welding, and the accuracy can be guaranteed within ±0.3 mm.

[0106] Welding process: There is no change from the previous stage, still 1 mm.

[0107] After calculation, there is a 1.6 - mm error band (A ± 0.8 mm) at the flipping seat after the overall welding of the vehicle frame, which meets the design requirements (A ± 1 mm).

[0108] Spot - welding improves the first - pass production rate of the vehicle frame, improves the production quality and reduces the production cost.

[0109] Through this positioning mechanism, the following can be achieved: 1. Meet the positioning production of the welding - type vehicle frame flipping seat.

[0110] 2. The mechanism can be extended for the production of inner circle positioning of other shaft sleeves. Components with similar structures and requirements can be used, such as the frame assembly of a wide-body vehicle suspension, or the double-bar abdominal lift assembly of a wide-body vehicle.

[0111] 3. The overall quick change and quantitative adjustment reduce the production adjustment time. Since all mechanisms are built on the base plate 01, if the base plate 01 can be moved as a whole during switching, the switching time can be reduced. And the adjustment of each positioning is set with gaskets, and quantitative adjustment is achieved through gaskets, which is convenient and fast.

[0112] 4. By using this fixture, the machining process after welding of the flipping seat of the welded frame can be reduced, achieving cost reduction in production. Through this tooling, the welding operation accuracy can be improved. With high positioning accuracy in the previous production process, the machining amount can be reduced.

[0113] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0114] In the present invention, unless otherwise clearly specified and defined, the terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0115] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0116] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0117] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A welded frame flip seat positioning mechanism, characterized in that: It includes a bottom plate, a lateral feeding mechanism, a multi-degree-of-freedom adjustment mechanism and a self-centering mechanism for rising and lowering pins; The rising pin self-centering mechanism is used to connect with the inner sleeve of the welded frame flip seat assembly; The multi-degree-of-freedom adjustment mechanism is arranged below the rising pin self-centering mechanism, and is used to adjust the angle of the rising pin self-centering mechanism with multiple degrees of freedom; The lateral feeding mechanism is arranged below the multi-degree-of-freedom adjustment mechanism and is used for lateral adjustment of the position of the rising pin self-centering mechanism; The bottom plate is arranged below the lateral feeding mechanism and is used to provide support for the lateral feeding mechanism.

2. The welded frame flip seat positioning mechanism according to claim 1, characterized in that: The lateral feeding mechanism comprises a guide rail, a slider, a limit block and a sliding plate; The guide rail is arranged on the bottom plate; The sliding plate is slidably connected to the guide rail via the slider; The sliding plate can be fixedly connected to the multi-degree-of-freedom adjustment mechanism; The limit block is arranged at the end of the guide rail and is used to limit the travel range of the sliding plate.

3. The welded frame flip seat positioning mechanism according to claim 2, characterized in that: The guide rail is fixedly connected to the base plate via pins.

4. The welded frame flip seat positioning mechanism according to claim 2, characterized in that: There are at least two self-centering mechanisms for rising sales; The number of the multi-degree-of-freedom adjustment mechanism, the slider and the sliding plate is the same as the number of the rising pin self-centering mechanism; The bottom of each self-centering mechanism for lifting and selling is connected to a multi-degree-of-freedom adjustment mechanism; each multi-degree-of-freedom adjustment mechanism is slidably connected to the guide rail through a sliding plate and a slider, so as to laterally adjust the spacing between each self-centering mechanism for lifting and selling.

5. The welded frame flip seat positioning mechanism according to claim 2, characterized in that: The multi-degree-of-freedom adjustment mechanism includes a Y-direction position connection block, a Y-direction position adjustment block, a Z-direction position connection block, a Z-direction position adjustment block, a Z-direction angle adjustment block, a Y-direction angle adjustment block and a cylinder connection plate; the Y-direction refers to a direction perpendicular to the movement of the lateral feeding mechanism in the bottom plate plane; the Z-direction refers to a direction perpendicular to the bottom plate plane; The top surface of the Y-direction position connection block is provided with a Z-direction angle rotation center with the axis direction being the Z-direction; The Y-axis position adjustment block is fixedly arranged on the sliding plate, and a mounting hole arranged along the Y-axis is arranged on its side, and a fixing hole matching the mounting hole is arranged on the side of the Y-axis position connection block; the Y-axis position adjustment block is fixedly connected to the Y-axis position connection block by a pin shaft passing through the mounting hole and the fixing hole, and a Y-axis position adjustment gasket is arranged between the mounting hole and the fixing hole, and the Y-axis position adjustment block adjusts the Y-axis position of the rising pin self-centering mechanism by adjusting the thickness and number of the Y-axis position adjustment gasket; The Z-axis position adjustment block is rotatably connected to the Y-axis position connection block via the Z-axis angular rotation center, and a Z-axis position adjustment gasket is provided between the Z-axis position adjustment block and the Y-axis position connection block; the vertical distance between the Z-axis position adjustment block and the Y-axis position connection block is adjusted by adjusting the thickness and quantity of the Z-axis position adjustment gasket, thereby adjusting the Z-axis position of the rising pin self-centering mechanism; The Z-direction angle adjustment block is arranged on the top surface of the Y-direction position connection block, and is abutted against the Z-direction position adjustment block through the Z-direction angle adjustment gasket, so that the Z-direction position adjustment block is rotated by adjusting the thickness and number of the Z-direction angle adjustment gasket, thereby adjusting the Z-direction angle of the rising pin self-centering mechanism; The Z-direction position connection block is fixedly connected to the Z-direction angle adjustment block, and is provided with a Y-direction angle rotation center with an axis direction in the Y direction; The cylinder connecting plate is rotatably arranged on the Z-axis angle connecting block through the Y-axis angle rotation center, and a Y-axis angle adjustment block is fixedly arranged on the Z-axis angle connecting block. The Y-axis angle adjustment block abuts against the cylinder connecting plate through the Y-axis angle adjustment gasket, so that the cylinder connecting plate is rotated by adjusting the thickness and number of the Y-axis angle adjustment gasket. The cylinder connecting plate is used to fix the connection to the self-centering mechanism of the rising pin, and the rotation of the cylinder connecting plate drives the change of the Y-axis angle of the self-centering mechanism of the rising pin.

6. The welded frame flip seat positioning mechanism according to claim 5, characterized in that: The Y-direction position connection block is provided with a Y-direction oblong hole, which is connected to the sliding plate through the oblong hole and the fixing pin; The Z-direction position adjustment block is provided with an annular through hole, and is connected to the Y-direction position connection block via the annular through hole and a fixing pin.

7. The welded frame flip seat positioning mechanism according to claim 1, characterized in that: The self-centering mechanism for the rising pin includes a cylinder, a connecting seat, a guide seat and a positioning wedge; The connecting seat is used to connect the multi-degree-of-freedom adjustment mechanism; The guide seat is arranged in the connecting seat and can reciprocate along the axial direction of the connecting seat. One end of the guide seat is connected to the output shaft of the cylinder, and the other end is provided with a wedge block. The positioning wedge block is radially slidably arranged on the connecting seat, and a bevel surface is arranged near one end of the inner diameter of the guide seat. The bevel surface of the positioning wedge block and the bevel surface of the wedge block are slidably fitted, thereby converting the axial movement of the guide seat into radial movement. The cylinder is installed on the connecting seat, and the cylinder drives the positioning wedge to be ejected outward through the guide seat.

8. The welded frame flip seat positioning mechanism according to claim 7, characterized in that: The positioning wedge blocks are in multiple groups, and the multiple groups of positioning wedge blocks are arranged in an evenly divided circle.

9. The welded frame flip seat positioning mechanism according to claim 8, characterized in that: The outer side of the positioning wedge is connected with a positioning wedge gasket through a pin.

10. A method for positioning a welded frame flip seat, characterized in that: The welded frame flip seat positioning mechanism according to any one of claims 1 to 9 comprises the following steps: The pin self-centering mechanism is moved to the vicinity of the inner sleeve of the flip seat assembly through the lateral feeding mechanism; The position of the pin-raising self-centering mechanism is adjusted through a multi-degree-of-freedom adjustment mechanism so that the pin-raising self-centering mechanism extends into the inner sleeve of the flip seat assembly; Start the self-centering mechanism of the rising pin to fit with the inner sleeve of the flip seat assembly to complete the positioning work.

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