Supercharged welding pliers

Abstract

The invention relates to the field of welding equipment, in particular to supercharged welding tongs which comprise a shell, a main air cylinder, an electrode, a limiting clamping column, an auxiliary air cylinder, a floating clamping column and a locking block, a main push rod is inserted into the main air cylinder, the limiting clamping column is connected to the left end of the main push rod, the auxiliary air cylinder is installed below the main air cylinder, an auxiliary push rod is inserted into the auxiliary air cylinder, and the floating clamping column is connected to the left end of the auxiliary push rod. The floating clamping column is connected to the left end of the auxiliary push rod, the two electrodes are installed on the left side of the limiting clamping column and the right side of the floating clamping column correspondingly, and the locking block is slidably connected to the interior of the shell and located between the limiting clamping column and the floating clamping column. And the floating clamping column is provided with a driving surface which is in contact with the locking block and has a non-uniform height profile. Pressurizing power is provided through the auxiliary air cylinder, the locking mechanism is driven to indirectly limit displacement of the main air cylinder, meanwhile, the power is amplified through the lever structure, and therefore the purpose of stably clamping a welded object at high pressure is achieved.

Description

Technical Field

[0001] This invention relates to the field of welding equipment, specifically a pressure-boosting welding clamp. Background Technology

[0002] Traditional welding clamps have one fixed electrode and the other movable electrode. The workpiece (which is pre-fixed by the clamp) is clamped by the movable electrode moving towards the fixed electrode. During clamping, to ensure sufficient contact between the fixed electrode and the workpiece surface, the overall position parameters of the welding clamp need to be adjusted. However, pressurized welding clamps are usually equipped with high-pressure or multi-stage cylinders, which are heavy and have a large inertia. Therefore, the adjustment process often applies a high-intensity impact to the workpiece, causing structural damage. To avoid this, existing technology improves the original fixed electrode to a floating one. The floating electrode and the movable electrode are driven by short-stroke cylinders and long-stroke cylinders, respectively. During clamping, the floating electrode first contacts the surface of the workpiece (without requiring overall clamp adjustment to make contact), and the movable electrode then contacts the other surface of the workpiece, applying a set pressure. This avoids damage to the workpiece structure caused by the overall clamp position adjustment.

[0003] The use of floating electrodes in existing technologies can reduce structural damage to the weldment caused by the welding clamp, but it cannot completely prevent it. This is especially true when welding thin materials with low structural strength, where the effectiveness of this protective measure is extremely limited. The reasons are as follows: After the moving electrode contacts the surface of the weldment, it continues to apply pressure to the weldment, while the floating electrode will retract under pressure. Although the floating electrode can be reset in time through the control system, the reset process is accompanied by dynamic adjustment, and the repeated repetition during the dynamic adjustment process will still damage the structural strength of the weldment.

[0004] To address this, a pressure-boosting welding clamp is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a pressure-boosting welding clamp that solves the problem of clamping imbalance caused by overflow valve fluctuations during pressure boosting. The auxiliary cylinder provides boosting power and drives the locking mechanism to indirectly limit the displacement of the main cylinder. At the same time, the lever structure amplifies the power, thereby achieving the purpose of high-pressure and stable clamping of the workpiece.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A pressure-boosting welding clamp for clamping and conducting electrical welding workpieces includes a housing, a main cylinder, and electrodes. The main cylinder is installed inside the housing, and a main push rod is inserted inside the main cylinder. The clamp also includes a limiting clamp, a secondary cylinder, a floating clamp, and a locking block. The limiting clamp is connected to the left end of the main push rod. The secondary cylinder is installed below the main cylinder, and a secondary push rod is inserted inside the secondary cylinder. The floating clamp is connected to the left end of the secondary push rod. Two electrodes are respectively installed on the left side of the limiting clamp and the right side of the floating clamp. The locking block is slidably connected inside the housing and is located between the limiting clamp and the floating clamp. The floating clamp has a driving surface with a non-uniform height profile that contacts the locking block.

[0008] The limiting clamp and the floating clamp are pushed to the left and right by the main push rod and the auxiliary push rod, respectively. The left-moving limiting clamp and the right-moving floating clamp cause the electrodes fixed by themselves to contact the two opposite surfaces of the weldment in turn. The left-moving floating clamp pushes the locking block to contact the limiting clamp.

[0009] In the existing technology, the movable electrode is used as the pressure end of the welding clamp, that is, the pressure is applied by the power of the main cylinder. Therefore, the main cylinder, which is already long-stroke, also needs to have a high-pressure function, which leads to a further increase in the weight of the main cylinder. This not only increases the manufacturing cost of the welding clamp, but also makes the welding clamp have a larger inertia, thereby increasing the control difficulty and energy consumption.

[0010] Preferably, the floating clamping column includes an extension column, a lever, and a sliding column. The extension column is connected to the left side of the auxiliary push rod. The lever is hinged to the housing, and the upper end of the lever is in contact with the left end of the extension column. The sliding column is slidably connected to the housing, and the right end of the sliding column is in contact with the lower end of the lever. The electrode is mounted on the sliding column. The distance from the hinge point of the lever and the housing to the upper end of the lever is greater than the distance to the lower end of the lever.

[0011] In the above scheme, the electrode on the floating clamp is used as the pressure end of the welding clamp. That is, the power of the short-stroke auxiliary cylinder is used to apply pressure, so that the long-stroke main cylinder does not need to be designed with high pressure, thereby reducing the overall weight of the welding clamp, improving the flexibility of the welding clamp operation and reducing the controlled energy consumption of the welding clamp. Furthermore, the original one-piece structure of the floating clamp is improved into a lever group (i.e., "extension column-lever-sliding column"). By setting a longer power arm at the force application end (i.e., the left end of the extension column), the power provided by the auxiliary cylinder to the electrode is further increased.

[0012] Preferably, the lever includes an upper column, a middle column, and a lower column. The upper end of the upper column is hinged to the left end of the extension column, and the hinge point between the upper column and the extension column is denoted as point A. The upper end of the middle column is hinged to the lower end of the upper column, and the hinge point between the middle column and the upper column is denoted as point B. The upper end of the lower column is hinged to the lower end of the middle column, and the hinge point between the lower column and the middle column is denoted as point C. The lower end of the lower column is hinged to the sliding column, and the hinge point between the lower column and the sliding column is denoted as point D. The hinge point between the middle column and the housing is denoted as point E.

[0013] In the above scheme, the lever assembly (i.e. "extension column-lever-sliding column") is further optimized by hinged to the upper column and extension column, hinged to the middle column, hinged to the middle column and the housing, hinged to the lower column and the middle column, and hinged to the lower column and the sliding column. This allows for the replacement of the original rigid surface contact with low-friction hinges, thereby reducing wear between structures and maintaining the accuracy of the control of the upper electrode of the sliding column for a long time.

[0014] Preferably, the distance between point B and point E is greater than the distance between point C and point E.

[0015] Preferably, in the right limit state of the auxiliary push rod, point A is located to the upper left of point B, and in the right limit state of the auxiliary push rod, point C is located to the upper right of point D;

[0016] In the above scheme, the positional relationships between points A and B, and between points C and D, ensure that the upper, middle, and lower columns are always under tension during the push stroke (i.e., the leftward movement of the auxiliary push rod). Compared to compression, the upper, middle, and lower columns will not buckle but tend to straighten and stabilize, thus better maintaining the accuracy and stability during the clamping and pressure application of the welded object, thereby avoiding structural damage to the welded object. Furthermore, the above point arrangement not only avoids parallelism between the upper column and the extension column but also avoids parallelism between the upper column and the middle column. When the former parallel relationship occurs, the force applied by the extension column cannot be effectively converted into a torque to drive the upper column to rotate, which will cause a high-intensity axial impact on the upper column and damage its structural strength. When the latter parallel relationship occurs, the mechanism is in a dead position, at which point the driving force cannot generate an effective driving torque, resulting in the mechanism being in a dead position and prone to motion jamming.

[0017] Preferably, the locking block is configured as a trapezoidal structure when viewed from the front, with the bottom of the locking block facing up. The front and rear sides of the locking block are slidably connected to the housing. A limiting groove is provided on the top of the locking block, and the diameter of the limiting groove is equal to the diameter of the limiting clamping post.

[0018] In the above scheme, the inverted trapezoidal structure of the locking block increases the contact area between the upper part of the locking block and the limiting clamping post, thereby increasing the friction between the locking block and the limiting clamping post. Furthermore, a limiting groove with the same diameter as the limiting clamping post is provided on the upper part of the locking block to further increase the contact area between the locking block and the limiting clamping post, thereby enhancing the limiting effect of the locking block on the limiting clamping post. On the other hand, it reduces the contact area between the lower part of the locking block and the extension post, thereby reducing the friction between the locking block and the extension post, and thus reducing the resistance of the auxiliary cylinder in the execution process.

[0019] Preferably, a ball bearing is installed below the locking block, and the ball bearing contacts the extension column. Through the rolling contact between the ball bearing and the extension column, the friction between the locking block and the extension column is further reduced, thereby further reducing the resistance during the execution process of the auxiliary cylinder.

[0020] Preferably, the extension column includes a left column, an inclined column, and a right column from left to right, and both the left column and the right column are horizontally arranged, with the left column below the right column;

[0021] In the above scheme, as the extension column moves to the left with the auxiliary push rod, the left column, the inclined column and the right column contact the ball in sequence, thereby pushing the locking block upward so that the limiting groove is tightly attached to the limiting clamp column. This restricts the movement of the electrode on the limiting clamp column when the electrode on the sliding column applies pressure to the weld, so as to avoid damage to the weld structure.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This invention utilizes the auxiliary cylinder to push the auxiliary push rod, simultaneously controlling the floating clamping column to move to the left and the locking block to move upward. Thus, before the electrode on the floating clamping column contacts the workpiece, the locking block contacts the limiting clamping column first, thereby limiting the electrode on the limiting clamping column. This avoids the retraction of the electrode on the limiting clamping column and the dynamic reciprocating phenomenon caused by the retraction, effectively protecting the structural integrity of thin-walled or low-strength workpieces under the pressure of the welding clamp.

[0024] 2. Building upon the stable clamping described above, this invention amplifies the power of the auxiliary cylinder through a lever structure, achieving highly efficient pressurization with a small footprint, thus optimizing the overall performance and cost of the welding clamp. This invention assigns the pressurization function to the short-stroke auxiliary cylinder and, through a lever structure with a specific lever arm ratio, significantly amplifies the output force of the auxiliary cylinder before applying it to the electrode. This design eliminates the need for the long-stroke main cylinder to have a high-pressure function, significantly reducing the specifications, weight, and cost of the main cylinder, thereby reducing the overall weight and moment of inertia of the welding clamp, improving operational flexibility, and reducing energy consumption.

[0025] 3. This invention further refines the lever into hinged upper, middle, and lower columns. First, hinges replace sliding surface contact between the extension column and the upper column, and between the lower column and the sliding column, significantly reducing motion wear and maintaining the accuracy of force transmission over a long period. Second, through the optimized layout of each hinge point, the upper, middle, and lower columns mainly bear tension rather than pressure during the push stroke, avoiding the risk of buckling of the pressure rod and ensuring the rigidity and stability of the upper, middle, and lower columns during the pressurization process, so as to maintain the control accuracy of the electrodes over a long period. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall isometric structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the overall internal structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the overall front view of the present invention;

[0029] Figure 4 This is a comparative schematic diagram of the lever installation method of the present invention;

[0030] Figure 5 For the present invention Figure 2 Enlarged schematic diagram of section F in the middle;

[0031] Figure 6 For the present invention Figure 3 Enlarged schematic diagram of section G in the middle;

[0032] Figure 7 This is a schematic diagram of the ball contact state with the left column of the present invention;

[0033] Figure 8 This is a schematic diagram of the ball contact oblique column state of the present invention;

[0034] Figure 9 This is a schematic diagram of the ball contact with the right column of the present invention.

[0035] In the diagram: 1. Housing; 2. Main cylinder; 21. Main push rod; 3. Electrode; 4. Limiting clamp; 5. Auxiliary cylinder; 51. Auxiliary push rod; 6. Floating clamp; 61. Extension column; 611. Left column; 612. Inclined column; 613. Right column; 62. Lever; 621. Upper column; 622. Middle column; 623. Lower column; 63. Sliding column; 64. Point A; 65. Point B; 66. Point C; 67. Point D; 68. Point E; 7. Locking block; 71. Limiting groove; 72. Ball bearing; 8. Welded component. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1 to 9 This invention provides a pressure-boosting welding clamp, the technical solution of which is as follows:

[0038] A pressure-boosting welding clamp for clamping and conducting electrical welding workpiece 8 includes a housing 1, a main cylinder 2, an electrode 3, a limiting clamping post 4, a secondary cylinder 5, a floating clamping post 6, and a locking block 7. The main cylinder 2 is installed inside the housing 1, and a main push rod 21 is inserted inside the main cylinder 2. The main cylinder 2 is equipped with an overflow valve, which serves as a safety device for the welding clamp in this invention. Its working principle is as follows: when the electrode 3 applies excessive pressure to the welding workpiece 8, the locking block 7 cannot completely lock the limiting clamping post 4. When fully limit-positioned, the air pressure inside the main cylinder 2 is maintained by the overflow valve to prevent damage to the main cylinder 2 due to overload. The limit clamp 4 is connected to the left end of the main push rod 21. In this method, the limit clamp 4 and the main push rod 21 are threaded together. When selecting the main cylinder 2, a screw-end type push rod is selected. The housing 1 is equipped with a slide rail for the limit clamp 4 to maintain the stability of the left and right movement of the limit clamp 4. The locking block 7 restricts the movement of the limit clamp 4 through friction. Therefore, the limiting clamp 4 will be made of a material with a high coefficient of friction. Thus, sufficient lubrication must be ensured between the limiting clamp 4 and its slide rail, such as by using a linear bearing. The auxiliary cylinder 5 is installed below the main cylinder 2, and an auxiliary push rod 51 is inserted inside the auxiliary cylinder 5. Compared with the main cylinder 2, the auxiliary cylinder 5 needs to provide the power for the electrode 3 to apply pressure. Therefore, it needs to have stronger output performance, so a larger cylinder diameter is selected. The floating clamp 6 is connected to the left end of the auxiliary push rod 51. The two electrodes 3 are respectively installed on the left side of the limiting clamp 4 and the right side of the floating clamp 6. Sensors are usually installed between the electrode 3 and the limiting clamp 4, and between the electrode 3 and the floating clamp 6, to monitor the contact status between the electrode 3 and the welded object 8 in real time. The locking block 7 is slidably connected inside the housing 1, and the locking block 7 is located between the limiting clamp 4 and the floating clamp 6. The floating clamp 6 is provided with a drive surface with a non-uniform height profile that contacts the locking block 7.

[0039] The limiting clamp 4 and the floating clamp 6 are pushed to the left and right by the main push rod 21 and the auxiliary push rod 51, respectively. The left-moving limiting clamp 4 and the right-moving floating clamp 6 cause the electrode 3, which is fixed to itself, to contact the two opposite surfaces of the weldment 8 in turn. The floating clamp 6 moves to the left and pushes the locking block 7 to contact the limiting clamp 4.

[0040] As one embodiment of the present invention, refer to Figure 1 and Figure 2The floating clamping column 6 includes an extension column 61, a lever 62, and a sliding column 63. The extension column 61 is connected to the left side of the auxiliary push rod 51. The lever 62 is hinged to the housing 1, and the upper end of the lever 62 is in contact with the left end of the extension column 61. The sliding column 63 is slidably connected to the housing 1, and the right end of the sliding column 63 is in contact with the lower end of the lever 62. The electrode 3 is mounted on the sliding column 63. The distance from the hinge point of the lever 62 and the housing 1 to the upper end of the lever 62 is greater than the distance to the lower end of the lever 62.

[0041] The extension column 61 and the auxiliary push rod 51 are connected by a thread, so the auxiliary cylinder 5 is a screw-end type push rod; the welding clamp is generally fixed on the robotic arm or held by hand. In this method, the welding clamp fixed on the robotic arm is taken as an example (the same below) to describe the relevant movement process; during operation, both the main push rod 21 and the auxiliary push rod 51 are reset (i.e., moved to the right limit position). First, the position of the welding clamp as a whole is adjusted by the robotic arm so that the workpiece 8 is located between the two electrodes 3 (the workpiece 8 is more biased towards the electrode 3 on the sliding column 63, and the distance between the electrode 3 on the sliding column 63 and the workpiece 8 should be kept within a certain range, because for workpieces 8 with different thicknesses, the distance adjustment between the two electrodes 3 is mainly achieved by the long-stroke main cylinder 2, while the auxiliary cylinder 5 is selected To control its weight, the stroke selection should be conservative when using a large cylinder diameter, thus limiting the range of motion of the electrode 3 on the slide column 63. Then, the main cylinder 2 drives the main push rod 21 to the left so that the electrode 3 on the limit clamp 4 contacts the surface of the weldment 8. Then, the auxiliary cylinder 5 drives the auxiliary push rod 51 to the left, and then the extension column 61 causes the upper end of the lever 62 to deflect to the left, thereby causing the lower end of the lever 62 to deflect to the right, which in turn drives the slide column 63 to the right so that the electrode 3 on the slide column 63 contacts the surface of the weldment 8. In this method, the control system of the main cylinder and the auxiliary cylinder is implemented by a programmable logic controller (PLC). The main cylinder 2 and the auxiliary cylinder 5 are connected to the air source through independent solenoid valves, and the solenoid valves are controlled by the output signal of the PLC.

[0042] As one embodiment of the present invention, refer to Figure 3Lever 62 includes an upper column 621, a middle column 622, and a lower column 623. The upper end of the upper column 621 is hinged to the left end of the extension column 61, and the hinge point between the upper column 621 and the extension column 61 is denoted as point A 64. The upper end of the middle column 622 is hinged to the lower end of the upper column 621, and the hinge point between the middle column 622 and the upper column 621 is denoted as point B 65. The upper end of the lower column 623 is hinged to the lower end of the middle column 622, and the hinge point between the lower column 623 and the middle column 622 is denoted as point C. 66. The lower end of the lower column 623 is hinged to the sliding column 63, and the hinge point between the lower column 623 and the sliding column 63 is denoted as point D 67. The hinge point between the middle column 622 and the housing 1 is denoted as point E 68. The distance between point B 65 and point E 68 is greater than the distance between point C 66 and point E 68. In this method, the distance between point B 65 and point E 68 is 150mm, and the distance between point C 66 and point E 68 is 30mm, thereby obtaining approximately 5 times mechanical supercharging.

[0043] In this method, lever 62 is further disassembled into upper column 621, middle column 622, and lower column 623, so as to reduce wear between structures through hinges, thereby maintaining the accuracy of control over electrode 3 for a long time; housing 1 is composed of multiple plates connected by threads, and during installation, it is... Figure 3 Using the housing 1 panel as the base plate, first screw the limiting clamp 4 and the extension column 61 into the main push rod 21 and the auxiliary push rod 51 respectively. Then, use bolts to fix the main cylinder 2 and the auxiliary cylinder 5 in their respective positions. Next, complete the hinge between the upper column 621, the middle column 622 and the lower column 623. Then, hinge the middle column 622 onto the housing 1 (note the installation direction of the middle column 622, and ensure that the distance between point B 65 and point E 68 is greater than the distance between point C 66 and point E 68). Then, complete the hinge between the upper column 621 and the extension column 61. Finally, insert the sliding column 63 into the housing 1 and complete the hinge between the sliding column 63 and the lower column 623.

[0044] As one embodiment of the present invention, refer to Figure 4 In the right extreme state of the auxiliary push rod 51, point A 64 is located to the upper left of point B 65, and in the right extreme state of the auxiliary push rod 51, point C 66 is located to the upper right of point D 67.

[0045] In this design, the movement of lever 62 (i.e., "upper column 621-middle column 622-lower column 623") is the most complex, and it bears the main stress during the pressurization stroke. Therefore, it is a key part of the structural design. Its movement process is divided into a push stroke and a return stroke. During the push stroke, the extension column 61 moves to the left, and during the return stroke, the extension column 61 moves to the right. In comparison, during the push stroke, the auxiliary cylinder 5 provides the power for the electrode 3 on the sliding column 63 to apply pressure to the weldment 8. Lever 62 (i.e., "upper column 621-middle column 622-lower column 623") will bear a greater force and is more prone to damage. The force on lever 62 The form (tension or compression) changes with the alternation of the push stroke and return stroke. When lever 62 is under compression, there is a risk of buckling. This deformation directly affects the control accuracy of electrode 3. Therefore, in the design of this invention, lever 62 is intentionally placed in tension during the "push stroke" which bears the main working load, and in compression during the "return stroke" where the load is smaller and the accuracy requirement is not high, thereby avoiding the risk of buckling. Specifically, in the right limit state of the auxiliary push rod 51 (i.e., the initial and reset state of the welding clamp), the positions of each point on lever 62 are maintained as shown in the figure (refer to...). Figure 4 (Left image in the middle); As for Figure 4 The right figure shows an installation method completely opposite to this one. In this method, point A64 is located to the upper right of point B65, and point C66 is located to the upper left of point D67. Clearly, in this installation method, when the extension column 61 moves to the left, the upper column 621, middle column 622, and lower column 623 will all be under pressure, thus posing a risk of buckling. To ensure the correct positioning of points A64, B65, C66, and D67, during installation, refer to... Figure 4 The installation is performed as shown in the left figure. In addition, in order to make the lever 62 have a large deflection angle and increase the adjustment range of the electrode 3 on the slide 63, point B 65 is positioned to the right of point E 68 during installation.

[0046] As one embodiment of the present invention, refer to Figure 5 From a frontal view, the locking block 7 is set as a trapezoidal structure, with the bottom of the locking block 7 on top. The rear side of the locking block 7 is slidably connected to the housing 1. A limiting groove 71 is opened on the top of the locking block 7. The diameter of the limiting groove 71 is equal to the diameter of the limiting clamping post 4.

[0047] The locking block 7 is configured as an inverted trapezoidal structure, with a slider installed on its rear side. A slide rail matching the slider of the locking block 7 is installed on the housing 1 in the vertical direction to limit the trajectory of the locking block 7 sliding up and down. The limiting groove 71 restricts the movement of the limiting clamping column 4 through friction. Therefore, the surfaces of the limiting groove 71 and the limiting clamping column 4 are made of a material with a high coefficient of friction, such as a semi-metallic friction material made by hot pressing a mixture of fillers such as iron powder and graphite with a resin binder. This type of material usually has a coefficient of friction as high as 0.35 to 0.45 and good heat resistance.

[0048] As one embodiment of the present invention, refer to Figure 6 A retainer is installed below the locking block 7, and a ball bearing 72 is installed inside the retainer. The ball bearing 72 contacts the extension post 61 to roll on the surface of the extension post 61, thereby reducing the frictional resistance between the locking block 7 and the extension post 61.

[0049] As one embodiment of the present invention, refer to Figures 7 to 9 The extension column 61 includes a left column 611, an inclined column 612 and a right column 613 from left to right. Both the left column 611 and the right column 613 are set horizontally, and the left column 611 is below the right column 613.

[0050] Reference Figure 7 The main push rod 21 moves to the left so that the electrode 3 on the limiting clamp 4 contacts the weldment 8. At this time, the auxiliary push rod 51 is still in the right extreme position, and the ball 72 is in contact with the left column 611, thereby separating the limiting groove 71 from the limiting clamp 4, that is, the limiting groove 71 will not obstruct the leftward movement of the limiting clamp 4; refer to Figure 8 At this time, the auxiliary push rod 51 is in the leftward movement process, and the ball bearing 72 is in contact with the inclined column 612 to continuously lift the locking block 7. To prevent the electrode 3 on the sliding column 63 from contacting the workpiece 8 during this process, when adjusting the overall position of the welding clamp by the robotic arm, a sufficient clearance should be maintained between the electrode 3 on the sliding column 63 and the workpiece 8; refer to Figure 9 As the auxiliary push rod 51 continues to move to the left, the electrode 3 on the slide column 63 contacts the weldment 8, and the ball 72 contacts the right column 613, so that the limiting groove 71 is tightly attached to the limiting clamp 4. Thus, when the auxiliary cylinder 5 provides pressure to the electrode 3 on the slide column 63, it restricts the movement of the limiting clamp 4 to avoid the reciprocating motion of the electrode 3, thereby avoiding structural damage to the weldment 8.

[0051] Working principle: The core of this invention is that the power provided by the auxiliary cylinder 5 not only increases the pressure of the welding clamp, but also restricts the displacement of the electrode 3, fundamentally solving the problem that the traditional floating electrode 3 will retract under pressure and damage the welded object 8 when it is pressurized.

[0052] Specifically, in order to achieve initial positioning and gentle clamping of the workpiece 8, firstly, the main cylinder 2 is activated, pushing the main push rod 21 and the limiting clamping column 4 to the left, so that the electrode 3 on the limiting clamping column 4 contacts the surface of the workpiece 8; then, the auxiliary cylinder 5 is activated, pushing the auxiliary push rod 51 to drive the floating clamping column 6 to the right, so that the electrode 3 on the floating clamping column 6 contacts the surface of the workpiece 8.

[0053] After the initial clamping is completed, in order to apply pressure to the weldment 8 without damaging its structure, the main cylinder 2 remains in place, while the auxiliary cylinder 5 continues to push the auxiliary push rod 51 to the left. This action produces two synchronous effects: First, the auxiliary push rod 51 pushes the upper end of the lever 62 through the extension column 61. According to the lever 62 principle (the distance from the hinge point of the lever 62 and the housing 1 to the upper end of the lever 62 is greater than the distance to the lower end of the lever 62), the lower end of the lever 62 pushes the sliding column 63 and its electrode 3 with an amplified force, thus increasing the pressure on the weldment 8; Second, the extension column 61 moves to the left... During the process, its left column 611, inclined column 612 and right column 613 will sequentially contact the locking block 7 to push the locking block 7 upward. When the right column 613 contacts the locking block 7, the limiting groove 71 above the locking block 7 will jam and lock the limiting clamping column 4 through the friction between itself and the limiting clamping column 4. In this way, the pressure applied by the pressurizing side (electrode 3 on the floating clamping column 6) is fully applied to the welded object 8, while the supporting side (electrode 3 on the limiting clamping column 4) is firmly locked, thereby avoiding the dynamic adjustment process of the electrode 3 and effectively protecting the integrity of the welded object 8.

[0054] To ensure the accuracy and stability of the control of electrode 3, the present invention optimizes the structure of lever 62; the lever 62 is designed as an upper column 621, a middle column 622 and a lower column 623 that are hinged together, and the upper column 621 is hinged to the extension column 61 and the lower column 623 is hinged to the sliding column 63. The original high-friction surface contact is replaced by low-friction rotation, thereby reducing the wear of the extension column 61, lever 62 and sliding column 63, thus ensuring the accuracy of power transmission among the three, so as to ensure the accuracy of the control of electrode 3 for a long time.

[0055] To ensure the rigidity and stability of lever 62 (i.e., "upper column 621, middle column 622 and lower column 623"), which is the core component in the pressurization process, during installation, point A 64 is positioned to the upper left of point B 65, and point C 66 is positioned to the upper right of point D 67. This ensures that the upper column 621, middle column 622 and lower column 623 are always under tension during the push stroke. The tension state avoids the risk of buckling of the compression rod, thereby ensuring the smoothness of the movement of the upper column 621, middle column 622 and lower column 623, so as to maintain their accuracy and stability in power transmission.

[0056] To enhance the locking effect while reducing drive energy consumption, the locking block 7 is designed as an inverted trapezoid with a wider top and a narrower bottom, and it contacts the extension post 61 in conjunction with the ball bearing 72. On the one hand, the wider top increases the contact area between the limiting groove 71 and the limiting clamping post 4, providing strong locking friction. On the other hand, the ball bearing 72 at the bottom changes the sliding surface friction into rolling point friction, which greatly reduces the force required for the auxiliary cylinder 5 to push the locking block 7, thus achieving reliable and efficient locking function.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure-boosting welding clamp for clamping and conducting electrical welding workpiece (8), comprising a housing (1), a main cylinder (2), and an electrode (3), wherein the main cylinder (2) is installed inside the housing (1), and a main push rod (21) is inserted inside the main cylinder (2), characterized in that: It also includes a limiting clamp (4), an auxiliary cylinder (5), a floating clamp (6), and a locking block (7). The limiting clamp (4) is connected to the left end of the main push rod (21). The auxiliary cylinder (5) is installed below the main cylinder (2), and an auxiliary push rod (51) is inserted inside the auxiliary cylinder (5). The floating clamp (6) is connected to the left end of the auxiliary push rod (51). The two electrodes (3) are respectively installed on the left side of the limiting clamp (4) and the right side of the floating clamp (6). The locking block (7) is slidably connected inside the housing (1), and the locking block (7) is located between the limiting clamp (4) and the floating clamp (6). The floating clamp (6) is provided with a driving surface with a non-uniform height profile that contacts the locking block (7). The limiting clamp (4) and the floating clamp (6) are pushed to the left and right by the main push rod (21) and the auxiliary push rod (51), respectively. The left-moving limiting clamp (4) and the right-moving floating clamp (6) cause the electrode (3) fixed to itself to contact the two opposite surfaces of the weldment (8) in turn. The left-moving floating clamp (6) pushes the locking block (7) to contact the limiting clamp (4).

2. The pressure-boosting welding clamp according to claim 1, characterized in that: The floating clamp (6) includes an extension column (61), a lever (62), and a sliding column (63). The extension column (61) is connected to the left side of the auxiliary push rod (51). The lever (62) is hinged to the housing (1), and the upper end of the lever (62) is in contact with the left end of the extension column (61). The sliding column (63) is slidably connected to the housing (1), and the right end of the sliding column (63) is in contact with the lower end of the lever (62). The electrode (3) is mounted on the sliding column (63). The distance from the hinge point of the lever (62) to the upper end of the lever (62) is greater than the distance to the lower end of the lever (62).

3. The pressure-boosting welding clamp according to claim 2, characterized in that: The lever (62) includes an upper column (621), a middle column (622), and a lower column (623). The upper end of the upper column (621) is hinged to the left end of the extension column (61), and the hinge point between the upper column (621) and the extension column (61) is denoted as point A (64). The upper end of the middle column (622) is hinged to the lower end of the upper column (621), and the hinge point between the middle column (622) and the upper column (621) is denoted as point B. Point (65), the upper end of the lower column (623) is hinged to the lower end of the middle column (622), and the hinge point between the lower column (623) and the middle column (622) is recorded as point C (66). The lower end of the lower column (623) is hinged to the sliding column (63), and the hinge point between the lower column (623) and the sliding column (63) is recorded as point D (67). The hinge point between the middle column (622) and the shell (1) is recorded as point E (68).

4. A pressure-boosting welding clamp according to claim 3, characterized in that: The distance between point B (65) and point E (68) is greater than the distance between point C (66) and point E (68).

5. A pressure-boosting welding clamp according to claim 3, characterized in that: In the right limit state of the auxiliary push rod (51), point A (64) is located to the upper left of point B (65), and in the right limit state of the auxiliary push rod (51), point C (66) is located to the upper right of point D (67).

6. A pressure-boosting welding clamp according to claim 2, characterized in that: From a frontal view, the locking block (7) is set as a trapezoidal structure with the bottom of the locking block (7) on top. The front and rear sides of the locking block (7) are slidably connected to the housing (1). A limiting groove (71) is opened on the top of the locking block (7). The diameter of the limiting groove (71) is equal to the diameter of the limiting clamp (4).

7. A pressure-boosting welding clamp according to claim 6, characterized in that: A ball bearing (72) is installed below the locking block (7), and the ball bearing (72) contacts the extension post (61).

8. A pressure-boosting welding clamp according to claim 7, characterized in that: The extension column (61) includes a left column (611), an inclined column (612), and a right column (613) from left to right. The left column (611) and the right column (613) are both horizontally arranged, and the left column (611) is below the right column (613).

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