Positioning welding device for desk frame supporting legs

Abstract

The invention discloses a positioning and welding device for desk frame supporting legs, and belongs to the technical field of welding. Comprising a positioning welding unit and a welding clamp unit, a pressing plate is strictly restrained to reciprocate along a vertical path through a precise sliding pair formed by a guide sleeve and a guide column, it is ensured that pressing force completely and vertically acts on supporting legs, interference of component force in the horizontal direction on a workpiece is completely eliminated, and the supporting legs placed on a supporting leg positioning seat are prevented from transversely sliding; according to the pressing mechanism, the toggle type lever principle is adopted, a worker holds a connecting rod by hand to conduct simple upward pulling or downward pressing action, then a pressing rod and a pressing plate can be driven to complete rapid lifting, single-hand rapid assembling and disassembling of one-hand releasing and one-hand pressing are achieved, and the clamping time is greatly shortened; when the handle is pressed downwards to cross a dead point position, the mechanism forms reliable mechanical self-locking, even if the handheld part is loosened, the pressing plate can still keep constant pressing force, and an operator can carry out welding operation without continuously applying force.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a positioning welding device for desk frame legs. Background Technology

[0002] The desk frame is a core component of educational furniture, and the welding quality of its legs and crossbeams directly determines the overall structure's load-bearing capacity and lifespan. In current desk frame manufacturing processes, leg welding typically employs simple clamps or manual positioning. Operators must connect the legs to the crossbeams and then tighten them with bolts or hold them in place by hand during welding. This method is not only inefficient but also makes it difficult to ensure consistency in mass production. With the increasing demands for precision and production capacity in the educational equipment industry, there is an urgent need to develop specialized welding equipment that combines positioning accuracy with ease of operation.

[0003] Existing support leg welding devices have significant drawbacks in practical applications: traditional clamps lack effective vertical guiding mechanisms, easily generating horizontal forces during clamping, causing the support legs to shift under welding thermal stress, affecting assembly accuracy; simultaneously, most devices use screw clamping or continuous force application, resulting in time-consuming and labor-intensive clamping processes, failing to meet the demands of rapid production cycles. Furthermore, the high temperatures generated during welding are concentrated locally on the component, and existing devices have insufficient heat dissipation performance, easily causing metal thermal deformation; moreover, the welding station is separated from the finished product storage area, occupying additional space and affecting workshop logistics efficiency. Therefore, a positioning welding device for desk frame support legs is proposed. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a positioning and welding device for desk frame legs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a positioning and welding device for a desk frame leg, comprising a positioning and welding unit and a welding fixture unit, wherein the welding fixture unit is installed on the top of the positioning and welding unit, the positioning and welding unit includes a base frame and a pressing mechanism installed on the front end face of the base frame, and a leg positioning seat is installed on the upper end face of the base frame.

[0006] Preferably, the base frame includes a base plate and an upright plate vertically installed at the center of the base plate. Support blocks are installed at the two edges of the front end face of the upright plate, and guide columns are vertically installed on the bottom end face of the support blocks. The other end of the guide columns is attached to the upper end face of the base plate.

[0007] Preferably, the clamping mechanism includes a mounting base and a handle mounted on the front end face of the mounting base. A connecting rod is movably mounted at the middle position of the handle. A pressure rod is movably connected to the lower end face of the connecting rod. The bottom of the pressure rod is fixedly connected to the upper end face of the pressure plate.

[0008] The clamping mechanism is a manual clamping device that uses the lever principle to achieve mechanical self-locking. Through the coordinated operation of its various substructures, this mechanism achieves efficient and precise clamping and positioning of the desk frame legs.

[0009] The mounting base serves as the load-bearing foundation for the entire clamping mechanism. It is fixedly installed on the front end of the vertical plate, providing stable rigid support for the mechanism so that it can withstand the reverse force generated during the clamping process without displacement or deformation.

[0010] The handle forms the lever arm of the lever system. Its length design amplifies the operator's hand strength, converting a smaller input force into a larger output clamping force. At the same time, its swing trajectory determines the lifting and lowering stroke of the pressure plate.

[0011] The linkage is the operating component that the operator holds directly, and it is also the middle hinge point of the toggle mechanism. Its core function is to convert the motion form—to convert the arc swing of the handle into the linear lifting and lowering motion of the lever, and to form a mechanical self-locking state after pressing down past the dead point.

[0012] As a force transmission component, the pressure bar is hinged to the connecting rod at the upper end and fixed to the pressure plate at the lower end. It converts the oblique force from the connecting rod into a vertically downward normal force, driving the pressure plate to perform lifting and lowering actions.

[0013] The pressure plate is an actuator that acts directly on the processed components. Its large bottom surface contacts the surface of the desk frame legs, which evenly distributes the concentrated load and prevents indentations or local deformation on the workpiece surface caused by point contact.

[0014] Preferably, the clamping mechanism further includes guide sleeves disposed on both sides of the upper end face edge block of the pressure plate, and a connecting block is installed at the bottom of the pressure plate;

[0015] Guide sleeves are located on both sides of the pressure plate edge and slide precisely with the guide posts on the base frame to form a vertical guide pair. This structure ensures that the pressure plate can only move back and forth along a strictly vertical path. When the operator presses it down, the horizontal component force is completely eliminated, preventing the outriggers placed on the outrigger positioning seats from sliding laterally.

[0016] The connecting block serves as a transitional connection and height adjustment, enhancing the connection strength between the pressure bar and the pressure plate, and can be adapted to processed components of different thicknesses.

[0017] In terms of operability, operators can quickly raise and lower the pressure rod and pressure plate by simply pulling up or pressing down on the lever, achieving quick one-handed installation and removal with a simple "release and press" motion. This significantly reduces clamping time and improves welding efficiency. Regarding mechanical performance, once the handle is pressed past the toggle dead point, the mechanism forms a reliable mechanical self-lock. Even when the handle is released, the pressure plate maintains a constant clamping force on the workpiece. Operators can perform welding operations without continuous force, effectively reducing labor intensity and avoiding the risk of loosening caused by welding heat deformation.

[0018] In terms of positioning accuracy, the precision guiding system composed of the guide sleeve and guide column strictly constrains the movement trajectory of the pressure plate, ensuring that the clamping force acts completely perpendicularly on the processed component placed on the upper end face of the support leg positioning seat, without generating any horizontal force interference, thereby ensuring the consistency of assembly accuracy and welding quality between the desk frame support leg and the crossbeam.

[0019] In addition, the design of the large-area pressure plate effectively protects the surface of the workpiece, while the modular substructure configuration allows the device to adapt to the welding requirements of different specifications of desk frame legs, and has good versatility and practicality.

[0020] Preferably, the guide post passes through the inner cavity of the guide sleeve, and the pressure plate can move vertically back and forth along the guide post.

[0021] Preferably, the support leg positioning seat includes a base body and a ring array of slots installed on the inner end wall of the base body. A front positioning block is installed on the front end face of the base body, and side wings are installed on both end faces of the base body. The other end of the side wings is fixedly connected to the connecting plate.

[0022] The support leg positioning seat is the core load-bearing unit for placing and positioning the support legs of the desk frame. Through the coordinated configuration of its main platform and surrounding accessories, a three-dimensional stable support system is constructed to ensure that the components to be welded maintain a precise spatial position during the welding process.

[0023] The upper surface of the base body directly contacts and supports the desk frame legs to be welded, providing a horizontal reference surface; the grooves installed in a ring array on the inner end wall are precisely matched with the outline of the legs, which is usually U-shaped or tubular, to achieve precise positioning and circumferential limiting of the horizontal position of the legs through cavity fitting, preventing rotational displacement during welding.

[0024] The front positioning block is vertically set on the front face of the base body, serving as a rigid stop at the end of the support leg. It longitudinally prevents the support leg from sliding forward, forming the first limiting barrier to ensure that the end face of the support leg is flush. The side wings are installed on both sides of the base body, expanding the support area laterally. They are fixedly connected to the connecting plate, which is ultimately installed and fixed to the upper surface of the bottom plate of the base frame, forming a continuous rigid connection structure of "positioning seat-side wing-connecting plate-base".

[0025] The front positioning block, side wings, and connecting plate constitute a three-dimensional stability constraint system: the front positioning block restricts the displacement of the outrigger from the longitudinal front end, preventing forward movement due to thrust or vibration during welding; the side wings enhance the structural rigidity from both sides laterally, resisting lateral moments during welding; the connecting plate, through a large-area fixed connection with the base frame, evenly transfers the overall load of the outrigger positioning seat to the device foundation, preventing local overturning. This composite support mode of "front stop-side support-base fixation" significantly improves the overall stability of the positioning seat when subjected to the pressure of the clamping mechanism and welding thermal stress, ensuring that the positional accuracy of the outrigger in three-dimensional space is not lost due to external forces.

[0026] Preferably, the support leg positioning seat further includes a pad block installed on the bottom end surface of the base body, wherein the bottom end surface of the pad block and the bottom end surface of the connecting plate are not on the same plane;

[0027] The pad is placed on the bottom surface of the base body, and its bottom surface is intentionally designed with a height difference from the bottom surface of the connecting plate. This creates a specific tilt angle or lifting height on the upper surface of the base body, thereby controlling the spatial posture of the support legs during welding and further improving the consistency of welding quality. The design of the annular array slots allows for the simultaneous positioning of multiple support legs or adaptability to different pipe diameters, enhancing the versatility of the device.

[0028] Preferably, the welding fixture unit includes a fixture base and a fence installed at the perimeter of the upper surface of the fixture base. The other end of the fence is connected to a heat dissipation top plate. A transverse positioning groove is opened in the middle of the lower surface of the heat dissipation top plate. A longitudinal groove is opened in the upper surface of the heat dissipation top plate. Lateral process holes are arranged on both sides of the heat dissipation top plate. The transverse positioning groove and the longitudinal groove are interconnected.

[0029] The fixture base bears the mechanical and thermal loads generated during the welding process and all the upper structure. A fence is installed around the perimeter of the upper surface of the base, extending upwards to form a lateral enclosure, which, together with the base, encloses an upward-opening internal cavity. This structural design allows the cavity to be directly used to place the finished desk frame components after welding, achieving spatial overlap between the welding station and the temporary buffer area. This reduces the footprint of dedicated material racks, facilitates easy access and batch transfer by workers, and optimizes the workshop material flow.

[0030] The heat dissipation top plate is installed at the top of the fence, forming the direct load-bearing surface for welding operations. The longitudinal grooves on its upper surface and the transverse positioning grooves in the middle of its lower surface are interconnected, forming a three-dimensional, interwoven airflow network. This interconnected channel structure, combined with the grid texture on the top plate surface, constitutes a highly efficient passive heat dissipation system: the high temperature of welding can be quickly conducted to the channel surface through the metal top plate, while the air convection formed within the interconnected channels continuously carries away heat, significantly reducing the cooling time of the components after welding, preventing metal thermal deformation or stress concentration caused by heat accumulation, and ensuring the dimensional accuracy of the welding between the desk frame legs and beams.

[0031] The side process holes are arranged on both sides of the heat dissipation top plate, which not only further enhances the ventilation and heat dissipation capacity of the inner cavity, but also provides an operating channel for welding electrodes or welding guns to extend from the side, realizing the accessibility of multi-angle welding.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] 1. Through the precision sliding pair formed by the guide sleeve and guide column, the pressure plate is strictly constrained to move back and forth along the vertical path, ensuring that the clamping force is completely perpendicular to the support leg, completely eliminating the interference of the horizontal component force on the workpiece, and avoiding the lateral slippage of the support leg placed on the support leg positioning seat; in conjunction with the "front stop-side support-bottom fixation" three-dimensional stability constraint system of the positioning seat (longitudinal limit of the front positioning block, lateral stiffness enhancement of the side wings, and large-area fixation of the connecting plate to prevent overturning), the positional accuracy of the support leg in three-dimensional space is ensured not to be lost due to external force, effectively guaranteeing the consistency of assembly accuracy and welding quality between the desk frame support leg and the crossbeam.

[0034] 2. The clamping mechanism adopts the toggle lever principle. The operator can quickly raise and lower the pressure rod and pressure plate by simply pulling up or pressing down the lever with the hand. This allows for quick one-handed installation and removal with a simple "release and press" action, greatly shortening the clamping time. When the handle is pressed down past the dead point, the mechanism forms a reliable mechanical self-lock. Even if the hand is released, the pressure plate can still maintain a constant clamping force. The operator can perform welding operations without continuous force, effectively reducing labor intensity and avoiding the risk of loosening caused by welding heat deformation.

[0035] 3. The heat dissipation top plate adopts a structure in which the horizontal positioning grooves and the vertical grooves are interconnected, forming a three-dimensional interlaced air circulation network, which constitutes an efficient passive heat dissipation system. The high temperature of welding can be quickly conducted through the metal top plate and carried away by the air convection in the groove, which significantly reduces the cooling time of the component after welding and effectively prevents metal thermal deformation or stress concentration caused by heat accumulation. The arrangement of the side process holes not only provides an operating channel for the welding torch to be inserted from the side, realizing the accessibility of multi-angle welding, but also further enhances the ventilation and heat dissipation capacity of the inner cavity. Attached Figure Description

[0036] Figure 1 This is a three-dimensional structural schematic diagram of a positioning and welding device for a desk frame leg proposed in this invention;

[0037] Figure 2 This is a schematic diagram of the positioning and welding unit structure of a positioning and welding device for a desk frame leg proposed in this invention;

[0038] Figure 3 This is a schematic diagram of the base frame structure of a positioning and welding device for a desk frame leg proposed in this invention;

[0039] Figure 4 This is a schematic diagram of the pressing mechanism of a positioning and welding device for a desk frame leg proposed in this invention;

[0040] Figure 5 This is a schematic diagram of the bottom structure of the clamping mechanism of the positioning and welding device for the support leg of a desk frame proposed in this invention;

[0041] Figure 6 This is a schematic diagram of the support leg positioning seat structure of a positioning and welding device for a desk frame support leg proposed in this invention;

[0042] Figure 7 This is a schematic diagram of the bottom structure of the support leg positioning seat of the positioning and welding device for the support leg of a desk frame proposed in this invention;

[0043] Figure 8 This is a schematic diagram of the welding fixture unit structure of the positioning and welding device for the support legs of a desk frame proposed in this invention.

[0044] In the diagram: 1. Positioning welding unit; 11. Base frame; 111. Base plate; 112. Vertical plate; 113. Support block; 114. Guide column; 12. Clamping mechanism; 121. Mounting seat; 122. Handle; 123. Connecting rod; 124. Pressure rod; 125. Pressure plate; 126. Guide sleeve; 127. Connecting block; 13. Leg positioning seat; 131. Base body; 132. Slot; 133. Front positioning block; 134. Side wing; 135. Connecting plate; 136. Pad block; 2. Welding fixture unit; 21. Fixture base; 22. Fence; 23. Heat dissipation top plate; 24. Horizontal positioning groove; 25. Longitudinal groove; 26. Lateral process hole. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0046] Reference Figures 1-8Example 1: A positioning and welding device for a desk frame leg includes a positioning and welding unit 1 and a welding fixture unit 2. The welding fixture unit 2 is installed on the top of the positioning and welding unit 1. The positioning and welding unit 1 includes a base frame 11 and a pressing mechanism 12 installed on the front end face of the base frame 11. The leg positioning seat 13 is installed on the upper end face of the base frame 11.

[0047] The base frame 11 includes a base plate 111 and an upright plate 112 vertically installed at the center of the base plate 111. Support blocks 113 are installed at the two edges of the front end face of the upright plate 112. Guide columns 114 are vertically installed on the bottom end face of the support blocks 113. The other end of the guide columns 114 is attached to the upper end face of the base plate 111.

[0048] The clamping mechanism 12 includes a mounting base 121 and a handle 122 mounted on the front end face of the mounting base 121. A connecting rod 123 is movably mounted at the middle position of the handle 122. A pressure rod 124 is movably connected to the lower end face of the connecting rod 123. The bottom of the pressure rod 124 is fixedly connected to the upper end face of the pressure plate 125.

[0049] The clamping mechanism 12 is a manual clamping device that uses the lever principle to achieve mechanical self-locking. Through the coordinated operation of its various substructures, this mechanism achieves efficient and precise clamping and positioning of the desk frame legs.

[0050] Mounting base 121 serves as the bearing foundation of the entire pressing mechanism. It is fixedly installed on the front end face of the upright plate 112, providing stable rigid support for the mechanism so that it can withstand the reverse force generated during the pressing process without displacement or deformation.

[0051] The handle 122 constitutes the lever arm of the lever system. Its length design amplifies the operator's hand strength, converting a small input force into a larger output clamping force. At the same time, its swing trajectory determines the lifting and lowering stroke of the pressure plate.

[0052] Link 123 is the operating component that the operator holds directly, and it is also the middle hinge point of the toggle mechanism. Its core function is to convert the motion form—to convert the arc swing of the handle into the linear lifting and lowering motion of the lever, and to form a mechanical self-locking state after pressing down past the dead point.

[0053] The pressure bar 124, as a force transmission component, is hinged to the connecting rod at its upper end and fixed to the pressure plate at its lower end. It converts the oblique force from the connecting rod into a vertically downward positive force, driving the pressure plate to perform lifting and lowering actions.

[0054] The pressure plate 125 is an actuator that directly acts on the processed components. Its large bottom surface contacts the surface of the desk frame legs, which evenly distributes the concentrated load and prevents indentations or local deformation on the workpiece surface caused by point contact.

[0055] In embodiment 2, the pressing mechanism 12 further includes guide sleeves 126 disposed on both sides of the upper end face edge block of the pressure plate 125, and a connecting block 127 installed at the bottom of the pressure plate 125;

[0056] Guide sleeves 126 are located on both sides of the edge of the pressure plate and are precisely slidably engaged with guide posts 114 on the base frame 11 to form a vertical guide pair. This structure ensures that the pressure plate can only move back and forth along a strictly vertical path. When the operator presses it down, the horizontal component force can be completely eliminated, preventing the outriggers placed on the outrigger positioning seats 13 from sliding laterally.

[0057] The connecting block 127 serves as a transitional connection and height adjustment, enhancing the connection strength between the pressure bar and the pressure plate, and can be adapted to processed components of different thicknesses.

[0058] In terms of operability, operators can quickly raise and lower the pressure rod 124 and pressure plate 125 by simply pulling up or pressing down the lever 123, achieving quick one-handed loading and unloading with a "one-release-one-press" action. This significantly shortens clamping time and improves welding efficiency. In terms of mechanical performance, once the handle is pressed down past the dead point of the toggle joint, the mechanism forms a reliable mechanical self-lock. At this point, even if the hand is released, the pressure plate 125 can still maintain a constant clamping force on the processed component. Operators can perform welding operations without continuous force, effectively reducing labor intensity and avoiding the risk of loosening caused by welding thermal deformation.

[0059] In terms of positioning accuracy, the precision guiding system composed of guide sleeve 126 and guide post 114 strictly constrains the movement trajectory of the pressure plate, ensuring that the clamping force acts completely perpendicularly on the processed component placed on the upper surface of the support leg positioning seat 13, without generating any horizontal force interference, thereby ensuring the consistency of assembly accuracy and welding quality between the desk frame support leg and the crossbeam.

[0060] In addition, the design of the large-area pressure plate effectively protects the surface of the workpiece, while the modular substructure configuration allows the device to adapt to the welding requirements of different specifications of desk frame legs, and has good versatility and practicality.

[0061] In Example 3, the guide post 114 passes through the inner cavity of the guide sleeve 126, and the pressure plate 125 can move vertically back and forth along the guide post 114.

[0062] The support leg positioning seat 13 includes a base body 131 and a ring array of slots 132 installed on the inner end wall of the base body 131. A front positioning block 133 is installed on the front end face of the base body 131, and side wings 134 are installed on both end faces of the base body 131. The other end of the side wing 134 is fixedly connected to the connecting plate 135.

[0063] The support leg positioning seat 13 is the core load-bearing unit for placing and positioning the support legs of the desk frame. Through the coordinated configuration of its main platform and surrounding accessories, a three-dimensional stable support system is constructed to ensure that the components to be welded maintain a precise spatial position during the welding process.

[0064] The upper surface of the base body 131 directly contacts and supports the desk frame legs to be welded, providing a horizontal reference surface; the slots 132 installed in a ring array on the inner end wall are usually U-shaped or tubular in shape and precisely match the outline of the legs. The cavity fit achieves precise positioning and circumferential limit of the horizontal position of the legs, preventing rotational displacement during welding.

[0065] The front positioning block 133 is vertically disposed on the front end face of the base body 131, serving as a rigid stop at the end of the support leg. It longitudinally prevents the support leg from sliding forward, forming the first limiting barrier to ensure that the end face of the support leg is flush. The side wings 134 are installed on both end faces of the base body 131, expanding the support area laterally. They are fixedly connected to the connecting plate 135, which is ultimately installed and fixed to the upper end face of the bottom plate 111 of the base frame 11, forming a continuous rigid connection structure of "positioning seat-side wing-connecting plate-base".

[0066] The front positioning block 133, side wings 134, and connecting plate 135 constitute a three-dimensional stability constraint system: the front positioning block 133 restricts the displacement of the outrigger from the longitudinal front end, preventing forward movement due to thrust or vibration during welding; the side wings 134 enhance the structural rigidity from both sides in the lateral direction, resisting lateral moments during welding; the connecting plate 135, through a large-area fixed connection with the base frame 11, evenly transfers the overall load of the outrigger positioning seat 13 to the device foundation, preventing local overturning. This composite support mode of "front stop-side support-base fixation" significantly improves the overall stability of the positioning seat when subjected to the pressure of the clamping mechanism 12 and welding thermal stress, ensuring that the positional accuracy of the outrigger in three-dimensional space is not lost due to external forces.

[0067] In embodiment 4, the support leg positioning seat 13 also includes a pad 136 installed on the bottom end face of the base body 131, and the bottom end face of the pad 136 is not on the same plane as the bottom end face of the connecting plate 135.

[0068] A pad 136 is disposed on the bottom end face of the base body 131, and its bottom end face is intentionally designed with a height difference from the bottom end face of the connecting plate 135, so that the upper end face of the base body 131 forms a specific tilt angle or lifting height, thereby controlling the spatial posture of the support legs during welding and further improving the consistency of welding quality. The design of the annular array slot 132 allows for the simultaneous positioning of multiple support legs or adapts to different pipe diameter specifications, enhancing the versatility of the device.

[0069] Example 5: The welding fixture unit 2 includes a fixture base 21 and a fence 22 installed on the periphery of the upper surface of the fixture base 21. The other end of the fence 22 is connected to a heat dissipation top plate 23. A transverse positioning groove 24 is opened in the middle of the lower surface of the heat dissipation top plate 23. A longitudinal groove 25 is opened in the upper surface of the heat dissipation top plate 23. Lateral process holes 26 are arranged on both sides of the heat dissipation top plate 23. The transverse positioning groove 24 and the longitudinal groove 25 are interconnected.

[0070] The fixture base 21 bears the mechanical and thermal loads generated during the welding process and all the upper structure. The enclosure 22 is installed around the perimeter of the upper surface of the base, extending upwards to form a lateral barrier, which, together with the base, encloses an upward-opening inner cavity. After welding, this structural design allows the inner cavity to be directly used to place the finished desk frame components, achieving spatial overlap between the welding station and the temporary buffer area. This reduces the footprint of dedicated material racks, facilitates easy access and batch transfer by workers, and optimizes the workshop material flow.

[0071] A heat dissipation top plate 23 is installed at the top of the fence, forming the direct load-bearing surface for welding operations. The longitudinal groove 25 on its upper surface and the transverse positioning groove 24 in the middle of its lower surface are interconnected, forming a three-dimensional, interwoven airflow network. This interconnected channel structure, combined with the grid texture on the top plate surface, constitutes a highly efficient passive heat dissipation system: the high temperature of welding can be quickly conducted to the channel surface through the metal top plate, while the air convection formed within the interconnected channels can continuously remove heat, significantly reducing the cooling time after welding, preventing metal thermal deformation or stress concentration caused by heat accumulation, and ensuring the dimensional accuracy of the welding between the desk frame legs and beams.

[0072] The side process holes 26 are arranged on both sides of the heat dissipation top plate, which not only further enhances the ventilation and heat dissipation capacity of the inner cavity, but also provides an operating channel for the welding electrode or welding torch to extend from the side, realizing the accessibility of multi-angle welding.

[0073] In summary, the clamping mechanism 12 is a manual clamping device that utilizes the lever principle to achieve mechanical self-locking. Through the coordinated operation of its various substructures, this mechanism achieves efficient and precise clamping and positioning of the desk frame legs.

[0074] Mounting base 121 serves as the bearing foundation of the entire pressing mechanism. It is fixedly installed on the front end face of the upright plate 112, providing stable rigid support for the mechanism so that it can withstand the reverse force generated during the pressing process without displacement or deformation.

[0075] The handle 122 constitutes the lever arm of the lever system. Its length design amplifies the operator's hand strength, converting a small input force into a larger output clamping force. At the same time, its swing trajectory determines the lifting and lowering stroke of the pressure plate.

[0076] Link 123 is the operating component that the operator holds directly, and it is also the middle hinge point of the toggle mechanism. Its core function is to convert the motion form—to convert the arc swing of the handle into the linear lifting and lowering motion of the lever, and to form a mechanical self-locking state after pressing down past the dead point.

[0077] The pressure bar 124, as a force transmission component, is hinged to the connecting rod at its upper end and fixed to the pressure plate at its lower end. It converts the oblique force from the connecting rod into a vertically downward positive force, driving the pressure plate to perform lifting and lowering actions.

[0078] The pressure plate 125 is an actuator that directly acts on the processed components. Its large bottom surface contacts the surface of the desk frame legs, which evenly distributes the concentrated load and prevents indentations or local deformation on the workpiece surface caused by point contact.

[0079] Guide sleeves 126 are located on both sides of the edge of the pressure plate and are precisely slidably engaged with guide posts 114 on the base frame 11 to form a vertical guide pair. This structure ensures that the pressure plate can only move back and forth along a strictly vertical path. When the operator presses it down, the horizontal component force can be completely eliminated, preventing the outriggers placed on the outrigger positioning seats 13 from sliding laterally.

[0080] The connecting block 127 serves as a transitional connection and height adjustment, enhancing the connection strength between the pressure bar and the pressure plate, and can be adapted to processed components of different thicknesses.

[0081] In terms of operability, operators can quickly raise and lower the pressure rod 124 and pressure plate 125 by simply pulling up or pressing down the lever 123, achieving quick one-handed loading and unloading with a "one-release-one-press" action, significantly shortening clamping time and improving welding efficiency. In terms of mechanical performance, once the handle is pressed past the toggle dead point, the mechanism forms a reliable mechanical self-lock. At this point, even if the handle is released, the pressure plate 125 maintains a constant clamping force on the workpiece. Operators can perform welding operations without continuous force, effectively reducing labor intensity and avoiding the risk of loosening caused by welding heat deformation.

[0082] In terms of positioning accuracy, the precision guiding system composed of guide sleeve 126 and guide post 114 strictly constrains the movement trajectory of the pressure plate, ensuring that the clamping force acts completely perpendicularly on the processed component placed on the upper surface of the support leg positioning seat 13, without generating any horizontal force interference, thereby ensuring the consistency of assembly accuracy and welding quality between the desk frame support leg and the crossbeam.

[0083] In addition, the design of the large-area pressure plate effectively protects the surface of the workpiece, while the modular substructure configuration allows the device to adapt to the welding requirements of different specifications of desk frame legs, and has good versatility and practicality.

[0084] The support leg positioning seat 13 is the core load-bearing unit for placing and positioning the support legs of the desk frame. Through the coordinated configuration of its main platform and surrounding accessories, a three-dimensional stable support system is constructed to ensure that the components to be welded maintain a precise spatial position during the welding process.

[0085] The upper surface of the base body 131 directly contacts and supports the desk frame legs to be welded, providing a horizontal reference surface; the slots 132 installed in a ring array on the inner end wall are usually U-shaped or tubular in shape and precisely match the outline of the legs. The cavity fit achieves precise positioning and circumferential limit of the horizontal position of the legs, preventing rotational displacement during welding.

[0086] The front positioning block 133 is vertically disposed on the front end face of the base body 131, serving as a rigid stop at the end of the support leg. It longitudinally prevents the support leg from sliding forward, forming the first limiting barrier to ensure that the end face of the support leg is flush. The side wings 134 are installed on both end faces of the base body 131, expanding the support area laterally. They are fixedly connected to the connecting plate 135, which is ultimately installed and fixed to the upper end face of the bottom plate 111 of the base frame 11, forming a continuous rigid connection structure of "positioning seat-side wing-connecting plate-base".

[0087] The front positioning block 133, side wings 134, and connecting plate 135 constitute a three-dimensional stability constraint system: the front positioning block 133 restricts the displacement of the outrigger from the longitudinal front end, preventing forward movement due to thrust or vibration during welding; the side wings 134 enhance the structural rigidity from both sides in the lateral direction, resisting lateral moments during welding; the connecting plate 135, through a large-area fixed connection with the base frame 11, evenly transfers the overall load of the outrigger positioning seat 13 to the device foundation, preventing local overturning. This composite support mode of "front stop-side support-base fixation" significantly improves the overall stability of the positioning seat when subjected to the pressure of the clamping mechanism 12 and welding thermal stress, ensuring that the positional accuracy of the outrigger in three-dimensional space is not lost due to external forces.

[0088] A pad 136 is disposed on the bottom end face of the base body 131, and its bottom end face is intentionally designed with a height difference from the bottom end face of the connecting plate 135, so that the upper end face of the base body 131 forms a specific tilt angle or lifting height, thereby controlling the spatial posture of the support legs during welding and further improving the consistency of welding quality. The design of the annular array slot 132 allows for the simultaneous positioning of multiple support legs or adapts to different pipe diameter specifications, enhancing the versatility of the device.

[0089] The fixture base 21 bears the mechanical and thermal loads generated during the welding process and all the upper structure. The enclosure 22 is installed around the perimeter of the upper surface of the base, extending upwards to form a lateral barrier, which, together with the base, encloses an upward-opening inner cavity. After welding, this structural design allows the inner cavity to be directly used to place the finished desk frame components, achieving spatial overlap between the welding station and the temporary buffer area. This reduces the footprint of dedicated material racks, facilitates easy access and batch transfer by workers, and optimizes the workshop material flow.

[0090] A heat dissipation top plate 23 is installed at the top of the fence, forming the direct load-bearing surface for welding operations. The longitudinal groove 25 on its upper surface and the transverse positioning groove 24 in the middle of its lower surface are interconnected, forming a three-dimensional, interwoven airflow network. This interconnected channel structure, combined with the grid texture on the top plate surface, constitutes a highly efficient passive heat dissipation system: the high temperature of welding can be quickly conducted to the channel surface through the metal top plate, while the air convection formed within the interconnected channels can continuously remove heat, significantly reducing the cooling time after welding, preventing metal thermal deformation or stress concentration caused by heat accumulation, and ensuring the dimensional accuracy of the welding between the desk frame legs and beams.

[0091] The side process holes 26 are arranged on both sides of the heat dissipation top plate, which not only further enhances the ventilation and heat dissipation capacity of the inner cavity, but also provides an operating channel for the welding electrode or welding torch to extend from the side, realizing the accessibility of multi-angle welding.

[0092] In this invention, the installation, connection or setting methods of all the above components are common mechanical methods, and the specific structure, model and coefficient index of all components are their own technologies. As long as they can achieve their beneficial effects, they can be implemented, so they will not be described in detail.

[0093] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

[0094] In this invention, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside, and vertical and horizontal" in the terminology only represent the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as limitations on the term. At the same time, numerals such as "first," "second," and "third" do not represent specific quantities or orders, but are merely used to distinguish names. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A positioning and welding device for a desk frame leg, comprising a positioning and welding unit (1) and a welding fixture unit (2), characterized in that, The positioning welding unit (1) is equipped with a welding fixture unit (2) on top. The positioning welding unit (1) includes a base frame (11) and a clamping mechanism (12) installed on the front end face of the base frame (11). The upper end face of the base frame (11) is equipped with a support leg positioning seat (13).

2. The positioning and welding device for a desk frame leg according to claim 1, characterized in that, The base frame (11) includes a base plate (111) and a vertical plate (112) installed vertically at the center of the base plate (111). Support blocks (113) are installed on both sides of the front end face of the vertical plate (112). Guide columns (114) are installed vertically on the bottom end face of the support blocks (113). The other end of the guide columns (114) is attached to the upper end face of the base plate (111).

3. The positioning and welding device for a desk frame leg according to claim 1, characterized in that, The clamping mechanism (12) includes a mounting base (121) and a handle (122) mounted on the front end face of the mounting base (121). A connecting rod (123) is movably mounted at the middle position of the handle (122). A pressure rod (124) is movably connected to the lower end face of the connecting rod (123). The bottom of the pressure rod (124) is fixedly connected to the upper end face of the pressure plate (125).

4. The positioning and welding device for a desk frame leg according to claim 3, characterized in that, The pressing mechanism (12) further includes guide sleeves (126) disposed on both sides of the upper end edge block of the pressure plate (125), and a connecting block (127) is installed at the bottom of the pressure plate (125).

5. The positioning and welding device for a desk frame leg according to claim 2, characterized in that, The guide post (114) passes through the inner cavity of the guide sleeve (126), and the pressure plate (125) can move vertically back and forth along the guide post (114).

6. The positioning and welding device for a desk frame leg according to claim 1, characterized in that, The support leg positioning seat (13) includes a base body (131) and a ring array of slots (132) installed on the inner end wall of the base body (131). A front positioning block (133) is installed on the front end face of the base body (131), and side wings (134) are installed on both end faces of the base body (131). The other end of the side wing (134) is fixedly connected to the connecting plate (135).

7. The positioning and welding device for a desk frame leg according to claim 6, characterized in that, The support leg positioning seat (13) also includes a pad (136) installed on the bottom surface of the base body (131), and the bottom surface of the pad (136) is not on the same plane as the bottom surface of the connecting plate (135).

8. The positioning and welding device for a desk frame leg according to claim 1, characterized in that, The welding fixture unit (2) includes a fixture base (21) and a fence (22) installed on the upper surface of the fixture base (21) around the perimeter. The other end of the fence (22) is connected to a heat dissipation top plate (23). A transverse positioning groove (24) is opened in the middle of the lower surface of the heat dissipation top plate (23). A longitudinal groove (25) is opened on the upper surface of the heat dissipation top plate (23). Lateral process holes (26) are arranged on both sides of the heat dissipation top plate (23).

9. The positioning and welding device for a desk frame leg according to claim 8, characterized in that, The transverse positioning groove (24) and the longitudinal groove (25) are interconnected.

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