Adjustable welding clamping and positioning device

Abstract

The invention provides an adjustable welding clamping and positioning device. The adjustable welding clamping and positioning device comprises a mounting table; the workpiece positioning assembly comprises clamping mechanisms symmetrically arranged on the end face of the mounting table; the height adjusting assembly is mounted at the bottom of the mounting table and comprises two lifting mechanisms; the position calibration assembly is arranged on the upper surface of the mounting table in a sliding mode to assist all the workpieces in alignment; the two lifting mechanisms of the height adjusting assembly are in linkage and drive the mounting table to ascend and descend horizontally. According to the scheme, the linked front-back lifting mechanism is arranged at the bottom of the mounting table to drive the whole device to ascend and descend horizontally, so that the height of the device adapts to operators with different heights, and alignment errors caused by unstable postures are eliminated.

Description

Technical Field

[0001] This invention relates to the field of welding tooling technology, and in particular to an adjustable welding clamping and positioning device. Background Technology

[0002] In the field of mechanical manufacturing, welding, as a fundamental process for connecting metal components, directly depends on the workpiece positioning accuracy. The production of complex structural parts often involves welding multiple workpieces together, requiring precise alignment of each component during welding to ensure the structural stability of the final product. Traditional welding operations often rely on manual hand-held positioning, which is not only inefficient but also prone to positional deviations due to operator fatigue. To improve positioning accuracy, existing technologies have developed specialized welding clamping devices that use rigid clamps to fix the workpiece, replacing manual gripping. For example, the workpiece welding positioning clamping device disclosed in Chinese Patent Publication No. CN222492798U uses a combination structure of a support frame and a pressure plate, which can simultaneously fix two sets of workpieces and improve alignment accuracy. While such devices solve the basic positioning problem, they still have significant limitations in practical applications.

[0003] Specifically, most current mainstream welding clamping devices adopt a fixed height design. Since welding operations require operators to maintain a specific posture for extended periods, and people of different heights have varying needs for workbench height, fixed-height devices force operators to passively adapt to the equipment. When the operator's height does not match the device height, the operator must maintain unnatural postures such as bending over or tiptoeing, which not only accelerates physical exertion but also easily leads to welding torch vibration due to postural instability. This decrease in operational accuracy caused by a lack of ergonomics is particularly evident in long-cycle welding operations involving large workpieces. Furthermore, the single-height design also limits the device's adaptability to different working conditions. For example, when a workpiece needs to be welded at multiple angles, a fixed height hinders the operator from flexibly adjusting their stance angle.

[0004] The fundamental flaw in existing technology lies in the lack of an adjustable mechanism. While the fixed-height design simplifies the structure, it sacrifices ergonomics, leading to two major technical problems: First, the working height cannot be adjusted in real time according to the operator's height, forcing personnel to work in unnatural postures and indirectly reducing welding accuracy; second, the device cannot adapt to the dynamic requirements of different workpiece welding angles on the operating space, reducing equipment reuse rate. This directly causes fluctuations in welding quality and losses in production efficiency, becoming a key bottleneck restricting the upgrading of welding processes. Summary of the Invention

[0005] To address the core issue of welding accuracy indirectly caused by unsuitable operating postures due to the fixed height of the welding clamping device, this solution uses a linked front and rear lifting mechanism at the bottom of the mounting platform to drive the overall horizontal lifting, making the device height adaptable to operators of different heights and eliminating alignment errors caused by unstable postures.

[0006] The second objective of this invention is to solve the problem of platform tilting caused by asynchronous operation of multiple lifting mechanisms. The horizontal lifting accuracy is ensured by synchronously driving two sets of front lifting screws through chains.

[0007] The third objective of this invention is to solve the problem of horizontal offset during the pressing process of the pressure plate by using the sliding fit between the connecting plate and the limiting groove to constrain the vertical movement trajectory of the pressure plate.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: An adjustable welding clamping and positioning device includes: Installation platform; A workpiece positioning assembly, comprising clamping mechanisms symmetrically arranged on the end face of the mounting table; The height adjustment assembly is installed at the bottom of the mounting platform and includes two sets of lifting mechanisms; A position calibration component, which is slidably mounted on the upper surface of the mounting platform to assist in the alignment of each workpiece; The height adjustment component consists of two sets of lifting mechanisms that work together to drive the mounting platform to move horizontally up and down.

[0009] This solution incorporates two interconnected lifting mechanisms at the bottom of the mounting platform to drive overall horizontal movement. Mechanical linkage ensures synchronized movement of the two lifting mechanisms, enabling height adjustment of the mounting platform and allowing the operator to adjust its position according to their height. This solution eliminates upper limb tremors caused by improper posture, improving weld seam positioning accuracy. The lifting mechanisms employ a symmetrical layout, with the front active lifting mechanism and the rear driven unit working in tandem, avoiding structural redundancy in traditional lifting systems and overcoming the tipping risk of single-point drive devices. The linkage mechanism transmits power through rigid connectors, ensuring smooth and synchronized lifting.

[0010] Preferably, the height adjustment assembly includes: two sets of first lifting frames symmetrically installed on the front side of the bottom of the mounting platform; two sets of second lifting frames symmetrically installed on the rear side of the bottom of the mounting platform; the first lifting frames are slidably nested within a first support shell; and the second lifting frames are slidably nested within a second support shell. The first lifting frames and the first support shell constitute an active lifting mechanism, and the second lifting frames and the second support shell form a driven support mechanism. This layout provides stable support at the four corners of the mounting platform, and the lifting frames move along a straight trajectory within the inner cavity of the support shell. The nested structure provides resistance to lateral forces, preventing the platform from tilting due to workpiece eccentricity. Compared to an independent lifting column design, this solution reduces the number of moving parts, simplifies the structure, and reduces the risk of wear.

[0011] Preferably, a first screw is rotatably mounted on the bottom of the inner cavity of the first support shell via a bearing. This first screw forms a threaded engagement with the lower side of the first lifting frame, and the two sets of first screws achieve synchronous transmission through sprockets and chains. The mounting platform is rigidly connected to the first and second lifting frames, ensuring that when the first lifting frame is used as the active drive unit for height adjustment, the second lifting frame can rise and fall synchronously, avoiding bending moments. The two sets of first screws are mechanically rigidly connected through sprockets and chains, ensuring absolutely synchronous rotation. When the left screw is driven, the right screw obtains the same speed and direction of rotation through chain transmission. This mechanical synchronization method avoids signal delays or errors that may occur in the electronic control system. The chain transmission mechanism is enclosed in a protective shell to prevent welding spatter from entering the transmission system. The threaded engagement between the screw and the bottom of the lifting frame converts rotational motion into linear displacement.

[0012] Preferably, a vertical rod is fixedly installed inside the second support shell, forming a sliding fit with the lower side of the second lifting frame. This structure provides vertical guidance and constraint for the rear lifting mechanism, limiting the horizontal freedom of the lifting frame. The surface of the vertical rod is hardened to reduce the coefficient of friction, ensuring smooth movement of the lifting frame. The guide structure withstands the bending moment generated by the workpiece load, preventing direct friction between the lifting frame and the inner wall of the support shell. The driven support mechanism requires no additional drive device, relying on the gravity of the mounting platform for follow-up movement.

[0013] Preferably, the system also includes a first motor that drives the left-side first screw to rotate. This first motor is fixedly mounted on the top of the left-side first support housing. The motor is fixed to the top of the left-side first support housing, and its output shaft is coaxially connected to the first screw. This arrangement keeps the motor away from the welding operation area, reducing the impact of high-temperature metal spatter on the motor. The motor matches the screw speed requirements through a reduction mechanism, providing sufficient torque to drive the lifting frame. The motor protective cover is equipped with heat dissipation channels to ensure that it does not overheat during prolonged continuous operation.

[0014] Preferably, the position calibration component includes: a bidirectional lead screw arranged along the length of the mounting platform; two sets of movable plates symmetrically mounted on both sides of the bidirectional lead screw via threads; and an alignment plate vertically fixed to the end of each movable plate. The bidirectional lead screw is arranged along the length of the mounting platform, and the two sets of movable plates are symmetrically mounted on both sides of the lead screw via threads. When the lead screw rotates, the left and right threads drive the movable plates to move in opposite directions. The alignment plate is vertically fixed to the end of each movable plate, allowing the alignment plate to move synchronously with the movable plates. This structure achieves single-input drive with dual outputs, ensuring the symmetry of the movement of the alignment plates on both sides. The lead screw lead is optimized to meet the requirements for fine-tuning accuracy.

[0015] Preferably, a second motor is connected to the end of the bidirectional lead screw to drive its rotation, and the second motor is fixed to the end face of the mounting platform. The motor is fixed to the end face of the mounting platform, and its output shaft is directly connected to the end of the bidirectional lead screw via a coupling. The motor is a reversible type, and the opening and closing movement of the alignment plate is achieved through a control circuit. The motor's installation position avoids the workpiece operating space, and its outer casing is electromagnetically shielded.

[0016] Preferably, the mounting platform has a sliding groove on its upper surface, and the bottom end of the movable plate slides into the sliding groove. The upper surface of the mounting platform is machined with a through-groove, and the bottom end of the movable plate has a matching guide protrusion. The sliding groove and the protrusion form a sliding pair to constrain the movement trajectory of the movable plate, ensuring that the movable plate moves in a straight line without deflection. The width of the sliding groove is slightly larger than the size of the protrusion to create a reasonable fitting clearance. A wear-resistant pad can be placed at the bottom of the groove to extend its service life.

[0017] Preferably, the clamping mechanism includes: a U-shaped frame fixed to the end face of the mounting table; a placement plate disposed at the bottom of the inner cavity of the U-shaped frame; a second screw threadedly mounted to the top of the U-shaped frame; and a pressure plate rotatably connected to the lower end of the second screw via a bearing. The bottom of the U-shaped frame is fixed to the surface of the mounting table, forming a rigid support frame. The placement plate is horizontally disposed at the bottom of the inner cavity of the U-shaped frame, bearing the weight of the workpiece. The second screw is vertically mounted in a threaded hole at the top of the U-shaped frame, and its lower end is connected to the pressure plate via a bearing. When the screw is rotated, the pressure plate moves in the vertical direction, thereby clamping or releasing the workpiece.

[0018] Preferably, connecting plates extend vertically from both sides of the pressure plate, and these connecting plates slide in conjunction with limiting grooves formed in the sidewalls of the U-shaped frame. The connecting plates are embedded within the limiting grooves to form a sliding fit, constraining the pressure plate to move only in the vertical direction. This structure eliminates the circumferential rotation of the pressure plate that may be caused by the screw's rotation, ensuring that the bottom surface of the pressure plate remains parallel to the placement plate. The depth of the limiting grooves covers the entire stroke of the pressure plate, and the sidewalls are hardened.

[0019] The present invention has the following beneficial effects: The height of the installation platform can be adjusted by a linkage lifting mechanism, allowing the operator to adjust the working position according to their height, avoiding welding torch vibration caused by unnatural postures and improving the alignment accuracy of the weld.

[0020] The chain-driven synchronous twin screw eliminates the difference in lifting stroke, prevents the mounting platform from tilting due to force on one side, and ensures the smoothness of lifting under load.

[0021] The sliding fit between the pressure plate connecting plate and the limiting groove constrains the horizontal degree of freedom, eliminates the pressure plate offset caused by thread clearance, and ensures the consistency of the workpiece clamping position.

[0022] A bidirectional lead screw drives the alignment plate to move symmetrically, and a single motor controls the synchronous opening and closing of the two positioning plates, simplifying the workpiece calibration process and improving positioning efficiency. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0024] Figure 2 This is a cross-sectional schematic diagram of the height adjustment structure in this invention.

[0025] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle.

[0026] Figure 4 This is a partial cross-sectional view of the clamping mechanism in this invention.

[0027] Figure 5 This is a schematic diagram of the U-shaped frame in this invention.

[0028] In the diagram: 1. Mounting platform; 11. Slide groove; 2. Height adjustment assembly; 21. First lifting frame; 22. Second lifting frame; 23. First support shell; 231. Top plate; 232. Opening; 24. First screw; 25. Sprocket; 26. Chain; 27. Second support shell; 271. Fixing plate; 28. Vertical rod; 29. ​​First motor; 210. Chain box; 211. First connecting plate; 212. Second connecting plate; 3. Clamping mechanism; 31. U-shaped frame; 311. Limiting groove; 32. Second screw; 33. Placement plate; 34. Pressure plate; 341. Connecting plate; 4. Position calibration assembly; 41. Second motor; 42. Bidirectional lead screw; 43. Moving plate; 44. Alignment plate. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0030] Example 1 like Figure 1As shown, an adjustable welding clamping and positioning device includes: a mounting platform 1; a workpiece positioning assembly, which includes clamping mechanisms 3 symmetrically arranged on the end face of the mounting platform 1; a height adjustment assembly 2, which is installed on the bottom of the mounting platform 1 and includes two sets of lifting mechanisms; and a position calibration assembly 4, which is slidably arranged on the upper surface of the mounting platform 1 to assist in the alignment of workpieces; wherein, the two sets of lifting mechanisms of the height adjustment assembly 2 are linked and drive the mounting platform 1 to move horizontally. The height adjustment assembly 2 includes: two sets of first lifting frames 21 symmetrically installed on the front side of the bottom of the mounting platform 1; and two sets of second lifting frames 22 symmetrically installed on the rear side of the bottom of the mounting platform 1; the first lifting frames 21 are slidably nested in a first support shell 23; and the second lifting frames 22 are slidably nested in a second support shell 27. A first screw 24 is rotatably installed at the bottom of the inner cavity of the first support shell 23 through a bearing, the first screw 24 forming a threaded engagement with the lower side of the first lifting frame 21, and the two sets of first screws 24 are synchronously driven by a sprocket 25 and a chain 26. A vertical rod 28 is fixedly installed inside the second support shell 27, and the vertical rod 28 forms a sliding engagement with the lower side of the second lifting frame 22. The vertical rod 28 is fixed inside the second support shell 27 and forms a sliding engagement with the second lifting frame 22. It also includes a first motor 29 that drives the left first screw 24 to rotate, and the first motor 29 is fixedly installed on the top of the left first support shell 23. The motor is fixed to the top of the left first support shell 23, and its output shaft is coaxially connected to the first screw 24.

[0031] This design incorporates two interconnected lifting mechanisms at the bottom of the mounting platform 1 to drive overall horizontal lifting. Mechanical linkage ensures synchronized movement of the two lifting mechanisms, enabling height adjustment of the mounting platform 1, allowing the operator to adjust the worktable position according to their height. This design eliminates upper limb tremors caused by improper posture and improves weld positioning accuracy. The lifting mechanisms employ a symmetrical layout, with the front active lifting mechanism and the rear driven unit working in tandem, avoiding structural redundancy in traditional lifting systems and overcoming the tipping risk of single-point drive devices. The linkage mechanism transmits power through rigid connectors, ensuring smooth and synchronized lifting. The first lifting frame 21 and the first support shell 23 constitute the active lifting mechanism, while the second lifting frame 22 and the second support shell 27 form the driven support mechanism. This layout provides stable support at the four corners of the mounting platform 1, and the lifting frames move along a straight trajectory within the support shell cavity. The nested structure provides resistance to lateral forces, preventing platform tilting caused by workpiece eccentricity. Compared to independent lifting column designs, this design reduces the number of moving parts, simplifies the structure, and lowers the risk of wear. Mounting platform 1 is rigidly connected to the first lifting frame 21 and the second lifting frame 22, ensuring that when the first lifting frame 21 is used as the active drive unit for height adjustment, the second lifting frame 22 can rise and fall synchronously, avoiding bending moment. An opening 232 is provided on the first support shell 23, corresponding to the chain 26. The two sets of first screws 24 are mechanically rigidly connected through sprockets and chains, ensuring absolutely synchronous rotation. When the left screw is driven, the right screw obtains the same speed and direction through chain 26 transmission. This mechanical synchronization scheme avoids signal delays or errors that may occur in the electronic control system. The chain drive mechanism is enclosed in a protective shell to prevent welding spatter from entering the transmission system. The threaded engagement between the screw and the bottom of the lifting frame converts rotational motion into linear displacement. The second lifting frame 22 is sleeved with the second support shell 27 to provide vertical guidance constraint for the rear lifting mechanism, limiting the horizontal degree of freedom of the lifting frame. The surface of the vertical rod 28 is hardened to reduce the coefficient of friction, ensuring smooth movement of the lifting frame. The guide structure bears the bending moment generated by the workpiece load, preventing direct friction between the lifting frame and the inner wall of the support shell. The driven support mechanism requires no additional drive unit, relying on the gravity of the mounting platform 1 for follow-up movement. The motor matches the screw speed requirements through a reduction mechanism, providing sufficient torque to drive the lifting frame. The motor protective cover has heat dissipation channels to ensure that it does not overheat during long-term continuous operation.

[0032] Furthermore, the position calibration component 4 includes: a bidirectional lead screw 42 arranged along the length of the mounting platform 1; two sets of movable plates 43 symmetrically installed on both sides of the bidirectional lead screw 42 via threads; and an alignment plate 44 vertically fixed to the end of each movable plate 43. A second motor 41 driving the rotation of the bidirectional lead screw 42 is connected to the end of the bidirectional lead screw 42, and the second motor 41 is fixed to the end face of the mounting platform 1.

[0033] A bidirectional lead screw 42 is arranged along the length of the mounting platform 1, and two sets of movable plates 43 are symmetrically installed on both sides of the lead screw via threads. When the lead screw rotates, the left and right threads drive the movable plates 43 to move in opposite directions. An alignment plate 44 is vertically fixed to the end of the movable plate 43, so that the alignment plate 44 moves synchronously with the movable plate 43. This structure realizes single-input drive with dual output, ensuring the symmetrical movement of the alignment plates 44 on both sides. The lead screw lead is optimized to meet the fine-tuning accuracy requirements. The motor is fixed to the end face of the mounting platform 1, and the output shaft is directly connected to the end of the bidirectional lead screw 42 via a coupling. The motor is a reversible type, and the opening and closing movement of the alignment plate 44 is realized through the control circuit. The motor installation position avoids the workpiece operating space, and the outer shell is electromagnetically shielded.

[0034] Furthermore, a sliding groove 11 is formed on the upper surface of the mounting platform 1, and the bottom end of the movable plate 43 slides in fit with the sliding groove 11. The upper surface of the mounting platform 1 is machined with a through sliding groove 11, and a matching guide protrusion is provided at the bottom end of the movable plate 43. The sliding groove 11 and the protrusion form a sliding pair to constrain the movement trajectory of the movable plate 43, ensuring that the movable plate 43 moves in a straight line without deflection. The width of the sliding groove 11 is slightly larger than the size of the protrusion to form a reasonable fitting clearance. A wear-resistant pad can be placed at the bottom of the groove to extend its service life.

[0035] Furthermore, the clamping mechanism 3 includes: a U-shaped frame 31 fixed to the end face of the mounting platform 1; a placement plate 33 disposed at the bottom of the inner cavity of the U-shaped frame 31; a second screw 32 threadedly mounted to the top of the U-shaped frame 31; and a pressure plate 34 rotatably connected to the lower end of the second screw 32 via a bearing. Connecting plates 341 extend vertically from both sides of the pressure plate 34, and the connecting plates 341 slide in conjunction with the limiting grooves 311 formed on the sidewalls of the U-shaped frame 31. The connecting plates 341 extend vertically from both sides of the pressure plate 34, and the vertical limiting grooves 311 are formed on the sidewalls of the U-shaped frame 31.

[0036] The bottom of the U-shaped frame 31 is fixed to the surface of the mounting platform 1, forming a rigid support frame. The placement plate 33 is horizontally set at the bottom of the inner cavity of the U-shaped frame 31 to bear the weight of the workpiece. The second screw 32 is vertically installed in the threaded hole at the top of the U-shaped frame 31, and its lower end is connected to the pressure plate 34 through a bearing. When the screw is rotated, the pressure plate 34 moves in the vertical direction to press or release the workpiece. The connecting plate 341 is embedded in the limiting groove 311 to form a sliding fit, constraining the pressure plate 34 to move only in the vertical direction. This structure eliminates the circumferential rotation of the pressure plate 34 that may be caused by the rotation of the screw, ensuring that the bottom surface of the pressure plate 34 is always parallel to the placement plate 33. The depth of the limiting groove 311 covers the entire stroke of the pressure plate 34, and the sidewalls are hardened.

[0037] Specifically, in this embodiment, the adjustable welding clamping and positioning device uses a mounting platform 1 as its basic support platform. A through-type sliding groove 11 is formed on the upper surface of the rectangular platform, and the groove 11 has a T-shaped cross-section. Two sets of first lifting frames 21 are symmetrically installed on the front side of the bottom of the mounting platform 1, and two sets of second lifting frames 22 are symmetrically installed on the rear side. All lifting frames are square tube welded frames. The first lifting frame 21 is slidably nested within the cavity of the first support shell 23. The first support shell 23 is a cylindrical structure with a closed bottom. A first screw 24 is installed at the bottom of its cavity via a bearing, and the first screw 24 forms a threaded pair with the threaded block at the bottom of the first lifting frame 21. Sprockets 25 are installed at the upper ends of the two sets of first screws 24, and the sprockets 25 are rigidly connected to each other via a chain 26 enclosed in a chain box 210. A first motor 29 is fixed to the top of the left first support shell 23, and the motor output shaft is directly connected to the left first screw 24 via a coupling. The second lifting frame 22 is slidably nested within the inner cavity of the second support shell 27. A vertical rod 28 is vertically fixed within the inner cavity of the second support shell 27, and the vertical rod 28 forms a sliding fit with the linear bearing at the bottom of the second lifting frame 22. The first support shell 23 and the second support shell 27 are rigidly connected by a first connecting plate 211 and a second connecting plate 212 to form an integral frame.

[0038] A U-shaped frame 31 is fixed to the end face of the mounting platform 1 as the main body of the clamping mechanism 3. A horizontal placement plate 33 is set at the bottom of the inner cavity of the U-shaped frame 31 to support the workpiece. A threaded hole is machined at the top center of the U-shaped frame 31, and a second screw 32 is vertically installed in it through the thread. The lower end of the second screw 32 is connected to a pressure plate 34 through a thrust ball bearing. Connecting plates 341 extend vertically on both sides of the pressure plate 34. Vertical limiting grooves 311 are opened on both side walls of the U-shaped frame 31, and the connecting plates 341 are embedded in the limiting grooves 311 to form a clearance fit. A position calibration component 4 is set on the upper surface of the mounting platform 1. A bidirectional lead screw 42 is installed longitudinally along the platform body through a bearing seat. Left-hand and right-hand threads are machined on both sides of the lead screw, respectively. Two sets of moving plates 43 are symmetrically installed on both sides of the lead screw through threaded holes. A T-shaped protrusion is set at the bottom of the moving plates 43 to slide in a sliding fit with the sliding groove 11 of the mounting platform 1. An alignment plate 44 is vertically fixed to the outer end of the moving plates 43. The end of the lead screw is connected to a second motor 41 through a coupling. The second motor 41 is fixed to the end face of the mounting platform 1.

[0039] When the operator starts the first motor 29, the motor drives the left first screw 24 to rotate, which in turn drives the right first screw 24 to rotate in the same direction via a sprocket and chain drive. The two sets of first lifting frames 21 rise and fall synchronously along the inner cavity of the first support shell 23 under the drive of the screws, raising or lowering the front of the mounting platform 1. The rear second lifting frame 22 rises and falls along the vertical rod 28 under the weight of the mounting platform 1, with the vertical rod 28 constraining the lifting frame to only move vertically. The four sets of lifting frames work together to achieve overall horizontal lifting of the mounting platform 1, with a height adjustment range covering conventional operational needs. During the lifting process, the chain 26 ensures that the displacement of the front and rear lifting mechanisms is consistent, preventing the platform from tilting.

[0040] After the workpiece is placed on the placement plate 33 inside the U-shaped frame 31, the second screw 32 is rotated to drive the pressure plate 34 to move downwards. The pressure plate 34 adapts to the workpiece surface angle through the thrust bearing, and the sliding fit between the connecting plate 341 and the limiting groove 311 eliminates the circumferential offset caused by the screw rotation, ensuring that the pressure plate 34 vertically presses the workpiece. When the second motor 41 is started to drive the bidirectional lead screw 42 to rotate, the left and right threads push the two moving plates 43 to move towards or away from each other. The T-shaped protrusion at the bottom of the moving plate 43 moves linearly along the slide groove 11, causing the alignment plate 44 to simultaneously clamp or loosen the side of the workpiece. The slide groove 11 constrains the movement trajectory of the moving plate 43 to avoid horizontal swaying during the positioning process.

[0041] This structural system achieves stepless height adjustment through mechanical linkage, allowing the operator to maintain a natural upright posture and eliminating the impact of postural vibrations on welding accuracy. The synchronous drive of chain 26 overcomes the risks of asynchronous operation in multiple lifting mechanisms, ensuring smooth lifting under load. The pressure plate 34 and limiting groove 311 structure suppress clamping pressure deviation, ensuring repeatable workpiece positioning accuracy. The calibration component driven by the bidirectional lead screw 42 simplifies the operation process, and a single motor controls two positioning plates for efficient centering. Each functional unit is built based on basic industrial components; the chain box 210 protects against welding spatter; and the vertical rod 28 undergoes hardening treatment to improve wear resistance. The overall solution is feasible for industrial transformation.

[0042] Furthermore, based on practical application, in the adjustable welding clamping and positioning device proposed in this solution, the mounting platform 1 is integrally welded from low-alloy steel plate, and its interior is equipped with grid-shaped reinforcing ribs to enhance its resistance to deformation. The slide 11 is milled and then shot-peened, with chip removal holes at the bottom to prevent slag accumulation. Both the first lifting frame 21 and the second lifting frame 22 are made of rectangular hollow cross-section profiles, and the end welded flanges are connected to the mounting platform 1 by high-strength bolts. A linear guide rail is installed inside the first support shell 23, and the guide rail slider is fixed to the side of the first lifting frame 21 to ensure no radial sway during the lifting process. The first screw 24 uses a trapezoidal thread, and the thread helix angle is optimized to achieve a self-locking function.

[0043] The vertical rod 28 inside the second support shell 27 is manufactured using a cold-drawing process, with a surface roughness controlled within Ra0.4μm. A linear bearing with a sealing ring is installed at the bottom of the second lifting frame 22, and an oil injection nozzle is installed on the outer ring of the bearing for periodic lubrication. The first connecting plate 211 and the second connecting plate 212 are channel steel components, with oblong holes machined at both ends to allow for fine adjustment of the support shell spacing. Cross reinforcing ribs are welded in the middle of the connecting plates, significantly improving the torsional stiffness of the frame.

[0044] The U-shaped frame 31 is integrally cast from cast steel, with positioning pin holes machined on its bottom mounting surface for precise alignment with the mounting platform 1. A replaceable wear-resistant liner is inlaid on the surface of the placement plate 33, and the liner has an array of vacuum adsorption holes to assist in fixing thin-walled workpieces. A handwheel is mounted on the top of the second screw 32, with knurled edges to increase friction. The thrust ball bearing housing is equipped with a dust cover and filled with high-temperature grease. A removable polyurethane buffer pad is inlaid on the bottom surface of the pressure plate 34, and the buffer pad has crisscrossing pressure-reducing grooves. The clearance between the connecting plate 341 and the limiting groove 311 is controlled within the standard tolerance range of sliding bearings, and a chamfer is provided at the entrance of the limiting groove 311 for easy assembly.

[0045] The transition zone between the left and right threads of the bidirectional lead screw 42 is equipped with a relief groove, and the thread profile is modified to reduce stress concentration. The moving plate 43 is made of die-cast aluminum alloy, and its T-shaped protrusion has a PTFE wear-resistant strip embedded at the bottom. The inner side of the alignment plate 44 is equipped with a laterally adjustable locating pin assembly, and the end of the locating pin has a tapered structure to facilitate the insertion of the workpiece. The second motor 41 is a waterproof and dustproof stepper motor, and the motor junction box is equipped with a metal flexible hose for protection of the interface. The bearing housing adopts a split structure to facilitate lead screw maintenance, and a labyrinth seal is set inside the housing to prevent contaminants.

[0046] This device ensures its functionality through several detailed design features: four sets of lifting mechanisms at the bottom of the mounting platform 1 form a stable support surface; the front active lifting mechanism ensures consistent displacement through mechanical synchronization; and the rear driven unit utilizes gravity to reduce energy consumption. The limiting mechanism of the inner pressure plate 34 of the U-shaped frame 31 eliminates the eccentric torque during the rotation of the screw, maintaining a vertical pressure trajectory. The bidirectional transmission mechanism of the position calibration component 4 works in conjunction with the guide system of the slide 11 to ensure the symmetrical movement of the two alignment plates 44.

[0047] The height adjustment mechanism's operating interface is centrally located on the front of the equipment, with the handwheel and motor control buttons within easy reach of the operator when standing naturally. Sufficient operating space is maintained in the workpiece clamping area, allowing the welding torch to approach the workpiece from multiple angles. The cable is integrated into the internal cable tray of the mounting platform 1, with no exposed wiring to avoid snagging risks. This structural configuration ensures functional reliability while also considering safety and ease of operation on the production floor, providing a high-precision positioning basis for welding operations.

[0048] In operation, the operator starts the first motor 29 to drive the left first screw 24 to rotate. The first screw 24 rotates in the bearing supported by the top plate 231. The sprocket 25 rotates synchronously with the first screw 24, and the right sprocket 25 is forced to rotate synchronously via the chain 26. The two sets of first lifting frames 21 rise and fall along the inner cavity of the first support shell 23 under the thread drive of the first screw 24. The chain box 210 seals the transmission system to block welding slag. When the front side of the mounting platform 1 rises and falls, the rear second lifting frame 22 slides along the vertical rod 28. The vertical rod 28 is fixed in the inner cavity of the second support shell 27 by the fixing plate 271. The first connecting plate 211 and the second connecting plate 212 connect the front and rear support shells to form a rigid frame, ensuring that the four sets of lifting frames move in coordination.

[0049] After the workpiece is placed on the placement plate 33 within the U-shaped frame 31, the second screw 32 is manually rotated to push the pressure plate 34 downwards. The pressure plate 34 adapts to the workpiece surface via bearings, and the connecting plates 341 on both sides slide vertically along the limiting grooves 311 of the U-shaped frame 31 to prevent displacement. The second motor 41 is started to drive the bidirectional lead screw 42 to rotate. The left-hand section of the lead screw drives the left moving plate 43, and the right-hand section drives the right moving plate 43. The T-shaped protrusion at the bottom of the moving plate 43 slides along the slide groove 11 of the mounting table 1, causing the alignment plate 44 to simultaneously clamp the side of the workpiece. When the alignment plate 44 contacts the workpiece, the rubber buffer layer absorbs the impact, and the slide groove 11 constrains the movement trajectory of the moving plate 43.

[0050] During welding, the welding torch approaches the workpiece via the U-shaped frame 31. The side wall of the chain box 210 blocks spatter and protects the internal chain 26. The surface hardened layer of the vertical rod 28 resists wear, and the linear bearing seal prevents dust intrusion. After welding, the operation is reversed: the second motor 41 reverses to reset the alignment plate 44, and the second screw 32 is rotated to raise the pressure plate 34. When adjusting the height, the first motor 29 drives the lifting mechanism, and the trapezoidal thread self-locks to maintain the position. During maintenance, the chain box 210 cover is opened to check the chain tension, and linear bearing grease is added through the grease nipple. This process ensures the stability of the frame through the first connecting plate 211 and the second connecting plate 212, the top plate 231 supports the rotation of the screw, and the fixing plate 271 fixes the vertical rod 28. All components work together to achieve human-machine adapted welding positioning.

Claims

1. An adjustable welding clamping and positioning device, characterized in that, include: Installation platform; A workpiece positioning assembly, comprising clamping mechanisms symmetrically arranged on the end face of the mounting table; The height adjustment assembly is installed at the bottom of the mounting platform and includes two sets of lifting mechanisms; A position calibration component, which is slidably mounted on the upper surface of the mounting platform to assist in the alignment of each workpiece; The height adjustment component consists of two sets of lifting mechanisms that work together to drive the mounting platform to move horizontally up and down.

2. The apparatus according to claim 1, characterized in that: The height adjustment component includes: Two sets of first lifting frames are symmetrically installed on the front side of the bottom of the mounting platform; Two sets of second lifting frames are symmetrically installed at the rear bottom of the mounting platform; The first lifting frame is slidably nested within the first support shell; The second lifting frame is slidably nested within the second support shell.

3. The apparatus according to claim 2, characterized in that: The bottom of the inner cavity of the first support shell is rotatably mounted with a first screw via a bearing. The first screw forms a threaded engagement with the lower side of the first lifting frame, and the two sets of first screws achieve synchronous transmission through sprockets and chains.

4. The apparatus according to claim 3, characterized in that: A vertical rod is fixedly installed inside the second support shell, and the vertical rod forms a sliding fit with the lower side of the second lifting frame.

5. The apparatus according to claim 3, characterized in that: It also includes a first motor that drives the first screw on the left side to rotate, and the first motor is fixedly installed on the top of the first support shell on the left side.

6. The apparatus according to any one of claims 1-5, characterized in that: The position calibration component includes: The bidirectional lead screw is installed along the length of the mounting platform; Two sets of movable plates are symmetrically installed on both sides of the bidirectional lead screw via threads; Alignment plates are vertically fixed at the ends of each movable plate.

7. The apparatus according to claim 6, characterized in that: The end of the bidirectional lead screw is connected to a second motor that drives its rotation, and the second motor is fixed to the end face of the mounting platform.

8. The apparatus according to claim 6, characterized in that: The mounting platform has a sliding groove on its upper surface, and the bottom end of the movable plate slides in conjunction with the sliding groove.

9. The apparatus according to any one of claims 1-5, characterized in that: The clamping mechanism includes: U-shaped bracket, fixed to the end face of the mounting platform; Placement plate, located at the bottom of the inner cavity of the U-shaped frame; The second screw is vertically installed on the top of the U-shaped frame via a thread; The pressure plate is rotatably connected to the lower end of the second screw via a bearing.

10. The apparatus according to claim 9, characterized in that: Connecting plates extend vertically from both sides of the pressure plate, and the connecting plates slide into the limiting grooves opened on the side wall of the U-shaped frame.

Images