Welding deformation control clamp for forklift portal section steel

Abstract

The invention discloses a welding deformation control clamp for forklift portal section steel, and belongs to the technical field of forklift portal section steel machining. The welding deformation control clamp comprises a machine body, and a pawl wheel is rotationally connected to the machine body; the double-station unit is connected to the machine body in a sliding mode, and a clamp unit is installed at the end of the double-station unit; and the automatic clamping unit is rotationally connected to the machine body and connected with the pawl wheel. Forklift portal frame profile steel slides into the machine body in the direction of the pawl wheel during welding, and the pawl wheel structure can limit reverse sliding of the forklift portal frame profile steel to achieve foundation locking and positioning. During welding, on one hand, the pawl wheel is locked to limit the movement of the profile steel, on the other hand, if the forklift portal profile steel generates a tiny reverse displacement trend, the flowing resistance of hydraulic oil in a flow channel is large, instantaneous hydraulic locking is formed, and due to the dual effects of pawl wheel locking and hydraulic damping locking, the forklift portal profile steel is fixed through structural limiting and dynamic buffering; and tiny vibration can be absorbed, vibration energy is consumed, and the quality and strength of a welding joint are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of forklift mast steel processing technology, specifically to a welding deformation control fixture for forklift mast steel. Background Technology

[0002] Forklift mast steel welding fixtures are tooling devices specifically designed for the precise assembly and welding of forklift masts. These fixtures typically include a robust base frame and multiple sets of quick-clamping clamps, which reliably secure the mast channel steel and internal lining plates in preset, ideal positions, thereby ensuring weld quality and dimensional accuracy.

[0003] However, during the welding process, the impact of electric arc, the high-frequency vibration of the welding machine, and the thermal stress on the components can easily cause the fixture to vibrate in whole or in part, which can lead to the positioning of the weldment, poor weld formation, or even irreversible welding deformation. Therefore, it is necessary to add a shock-absorbing buffer module and a multi-point rigid support structure to the fixture design to solve the problems caused by the fixture vibration and ensure the stability of the component position and controllable deformation during the welding process. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a welding deformation control fixture for forklift mast steel, thereby solving the problem of uneven clamping caused by structural differences and ensuring the stability of the component's position and controllable deformation during the welding process.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A welding deformation control fixture for forklift mast steel, comprising: The machine body has a ratchet wheel rotatably connected to it, and the ratchet wheel is slidably connected to the surface of the forklift mast steel. The dual-station unit is slidably connected to the machine body. A clamping unit is installed at the end of the dual-station unit. The dual-station unit is used to alternately clamp and fix the upper surface of the forklift mast steel through the clamping unit. The automatic clamping unit is rotatably connected to the machine body and connected to the ratchet wheel. It is used to cooperate with the ratchet wheel to achieve automatic clamping and fixing of both sides of the forklift mast steel.

[0006] As a preferred embodiment of the present invention, the dual-station unit includes: a bracket fixed to the machine body, with a support plate fixed in the middle of the bracket; a slide rod slidably connected to the support plate, with a rolling wheel installed at the upper end of the slide rod; a cylinder installed on the top of the bracket; a sliding groove formed on the top of the bracket, with a sliding member slidably connected inside, one side of the sliding member fixed to the output end of the cylinder; a sliding frame slidably connected to the inner wall of the top of the bracket, and the sliding frame and the sliding member are fixedly connected; and an arc-shaped groove formed on the sliding frame, with one end of the rolling wheel slidably connected to the surface of the arc-shaped groove, and the other end of the rolling wheel connected to the support plate through an elastic member.

[0007] As a preferred embodiment of the present invention, a limiting unit is fixed at the upper end of the sliding frame. The limiting unit is used to guide and limit the sliding frame. The limiting unit includes: a slide rail, fixed to the top inner wall of the bracket; and a slider, fixed to the sliding frame, with the slider slidably connected to the slide rail.

[0008] As a preferred embodiment of the present invention, the clamping unit includes: a fixed frame connected to the lower end of the slide rod, with four sets of spring columns slidably connected on the fixed frame; a fixed wheel fixed to the end of the spring columns, with the fixed wheel and the fixed frame connected by a compression spring; an extension rod fixedly connected to the lower side of the fixed frame, with a limit frame connected to its end; and a fixed plate slidably connected to the middle of the extension rod, with a clamping block connected to the lower side of the fixed plate via a support column.

[0009] As a preferred embodiment of the present invention, a disc is slidably connected to the surface of the extension rod. The upper surface of the disc is slidably connected to a fixed wheel, and the lower surface of the disc is slidably connected to a fixed plate. A clearance hole is provided on the disc and the fixed plate. The extension rod passes through two sets of clearance holes, and the clearance holes are used for the free movement of the extension rod.

[0010] As a preferred embodiment of the present invention, a cooling unit is installed on the clamping unit. The cooling unit is used to cool the clamping block. The cooling unit includes: a fixed cylinder connected to the lower side of the fixed frame, with a slidable piston component sealed inside; an elastic element connected between the piston component and the inner wall of the fixed cylinder; and a support rod fixed to the lower side of the piston component, with a clamping plate connected to its end.

[0011] As a preferred embodiment of the present invention, an air inlet pipe and an exhaust pipe are respectively connected to both sides of the fixed cylinder, and both the air inlet pipe and the exhaust pipe are connected to the fixed cylinder through a one-way valve.

[0012] As a preferred embodiment of the present invention, the automatic clamping unit includes: an L-shaped frame fixed to the machine body, with at least two sets of rotating shafts rotatably connected inside, and a ratchet wheel fixed to the surface of the rotating shaft; a hydraulic cylinder fixed to the inner wall of the L-shaped frame, with two sets of hydraulic oil grooves inside the hydraulic cylinder, and the two sets of hydraulic oil grooves connected by a flow channel; a sliding plug slidably connected inside the hydraulic oil groove, and the sliding plug and the inner wall of the hydraulic oil groove are connected by a spring; and a rotating frame fixed to the rotating shaft, with arc-shaped frames connected to both ends of the rotating frame, and the ends of both sets of arc-shaped frames being fixedly connected to the sliding plug.

[0013] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: In the present invention, when welding the forklift mast steel, it slides into the machine body along the direction of the ratchet wheel. The ratchet wheel structure can restrict its reverse sliding to achieve basic locking positioning. At the same time, the sliding of the steel will drive the rotating shaft and the arc frame to work together, causing the sliding plug to squeeze the hydraulic oil in the hydraulic oil groove and compress the spring. After the forklift mast steel is in place, the spring returns to its original position, allowing the ratchet wheel to fit tightly against the surface of the steel. During welding, on the one hand, the ratchet wheel locks and restricts the movement of the steel; on the other hand, if the forklift mast steel has a slight tendency to reverse displacement, the hydraulic oil has a large flow resistance in the flow channel, forming an instantaneous hydraulic lock, which hinders the movement of the components. This dual effect of ratchet wheel locking and hydraulic damping lock not only fixes the forklift mast steel through structural limitation and dynamic buffering, but also absorbs small vibrations, consumes vibration energy, avoids hard contact wear, improves welding positioning accuracy, reduces the risk of welding defects, and ensures the quality and strength of the welded joint.

[0014] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a welding deformation control fixture for forklift mast steel provided as an embodiment of the present invention.

[0016] Figure 2 This is a front view of a welding deformation control fixture for forklift mast steel provided by the present invention.

[0017] Figure 3 for Figure 1 A magnified view of part A in the middle.

[0018] Figure 4 for Figure 2 A magnified view of part B in the middle section.

[0019] Figure 5 This is a cross-sectional schematic diagram of a cooling unit for a welding deformation control fixture for forklift mast steel provided by the present invention.

[0020] Figure 6This invention provides a schematic diagram of the structure of a hydraulic cylinder for a welding deformation control fixture for forklift mast steel.

[0021] Figure 7 This invention provides a schematic diagram of the pawl wheel of a welding deformation control fixture for forklift mast steel.

[0022] Figure 8 This is a schematic diagram of the structure of an automatic clamping unit for a welding deformation control fixture for forklift mast steel provided by the present invention.

[0023] Reference numerals: 1. Machine body; 11. Pawl wheel; 2. Dual-station unit; 21. Bracket; 22. Support plate; 23. Slide bar; 231. Rolling wheel; 24. Cylinder; 25. Sliding component; 26. Slide groove; 27. Sliding frame; 271. Arc groove; 3. Limiting unit; 31. Slide rail; 32. Slider; 4. Clamping unit; 41. Fixing frame; 42. Extension rod; 421. Limiting frame; 43. Fixing plate; 44. Support column; 45. Clamping block; 46. Spring 47. Spring post; 48. Fixed wheel; 5. Compression spring; 69. Cooling unit; 50. Fixed cylinder; 511. Air inlet pipe; 512. Exhaust pipe; 513. Piston; 52. Elastic element; 53. Support rod; 54. Clamping plate; 65. Disc; 66. Clearance hole; 77. Automatic clamping unit; 78. L-shaped frame; 79. Rotating shaft; 70. Hydraulic cylinder; 71. Hydraulic oil tank; 72. Flow channel; 73. Rotating frame; 74. Arc frame; 75. Sliding plug; 76. Spring. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0026] See Figures 1 to 8 A welding deformation control fixture for forklift mast steel, comprising: The machine body 1 has a ratchet wheel 11 rotatably connected to the machine body 1, and the ratchet wheel 11 is slidably connected to the surface of the forklift mast steel. The dual-station unit 2 is slidably connected to the machine body 1. A clamping unit 4 is installed at the end of the dual-station unit 2. The dual-station unit 2 is used to alternately clamp and fix the upper surface of the forklift mast steel through the clamping unit 4. The automatic clamping unit 7 is rotatably connected to the machine body 1 and connected to the ratchet wheel 11. It is used to cooperate with the ratchet wheel 11 to achieve automatic clamping and fixing of both sides of the forklift mast steel.

[0027] In one embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the dual-station unit 2 includes: The bracket 21 is fixed to the body 1, and a support plate 22 is fixed in the middle of the bracket 21; The slide rod 23 is slidably connected to the support plate 22, and a roller 231 is installed at the upper end of the slide rod 23; Cylinder 24 is mounted on top of bracket 21; The slide groove 26 is opened on the top of the bracket 21, and a sliding member 25 is slidably connected inside it. One side of the sliding member 25 is fixed to the output end of the cylinder 24. The sliding frame 27 is slidably connected to the top inner wall of the bracket 21, and the sliding frame 27 and the sliding member 25 are fixedly connected. An arc-shaped groove 271 is formed on the sliding frame 27. One end of the rolling wheel 231 is slidably connected to the surface of the arc-shaped groove 271, and the other end of the rolling wheel 231 is connected to the support plate 22 through an elastic element.

[0028] When welding the forklift mast steel, first place the C-shaped or J-shaped steel between the two sets of ratchet wheels 11, then activate the cylinder 24. The output end of the cylinder 24 will drive the sliding member 25 to slide within the slide groove 26. The sliding member 25 will drive the sliding frame 27 to slide on the inner wall of the machine body 1. The sliding frame 27 will drive the arc-shaped groove 271 to slide synchronously. Since the arc-shaped groove 271 and the rolling wheel 231 are connected by rolling, as the sliding frame 27 slides from the leftmost to the rightmost position, the left sliding rod 23... The end roller 231 slides to the protrusion of the arc groove 271, and the end roller 231 of the right slide rod 23 slides to the concave part of the arc groove 271. Thus, the left slide rod 23 slides downward in the support plate 22 under the action of the roller 231 and the protrusion of the arc groove 271. When the roller 231 slides, it compresses the elastic element (specifically a spring). The right roller 231 drives the right slide rod 23 to move upward under the action of the corresponding elastic element.

[0029] Therefore, when the sliding frame 27 slides to the right, the left sliding rod 23 will drive the clamping unit 4 at its end to slide upward, and the right sliding rod 23 will drive the clamping unit 4 at its end to slide downward. Thus, the two sets of clamping units 4 can alternately clamp the forklift mast steel. When one set of clamping units 4 is clamping the forklift mast steel, the forklift mast steel can be welded.

[0030] In this embodiment, the slider 25 drives the sliding frame 27 to slide on the inner wall of the body 1, and the sliding frame 27 drives the slider 32 to slide on the slide rail 31. Through the cooperation of the slide rail 31 and the slider 32, the stability of the sliding frame 27 during sliding can be improved.

[0031] In one embodiment of the present invention, such as Figure 3 and Figure 4 As shown, the clamping unit 4 includes: The fixing frame 41 is connected to the lower end of the slide rod 23, and four sets of spring columns 46 are slidably connected on the fixing frame 41; A fixed wheel 47 is fixed to the end of a spring column 46, and the fixed wheel 47 and the fixed frame 41 are connected by a compression spring 48; The extension rod 42 is fixedly connected to the lower side of the fixed frame 41, and the end is connected to the limit frame 421; The fixed plate 43 is slidably connected to the middle of the extension rod 42, and the lower side of the fixed plate 43 is connected to the clamping block 45 through the support column 44.

[0032] like Figure 3 As shown, a disc 61 is slidably connected to the surface of the extension rod 42. The upper surface of the disc 61 is slidably connected to the fixed wheel 47, and the lower surface of the disc 61 is slidably connected to the fixed plate 43. The disc 61 and the fixed plate 43 are provided with clearance holes 62. The extension rod 42 passes through two sets of clearance holes 62, and the clearance holes 62 are used for the free movement of the extension rod 42.

[0033] In this embodiment, when clamping the C-shaped steel, when one set of sliding rods 23 slides downward, the sliding rods 23 will drive the extension rod 42 and the fixing plate 43 to move downward. The fixing plate 43 will drive the clamping blocks 45 to move downward through the support column 44 until the two sets of clamping blocks 45 contact the side of the C-shaped steel, thus achieving initial fixation of the C-shaped steel. As the sliding rods 23 continue to descend, the clamping blocks 45 will push the support column 44 upward under the action of the C-shaped steel. The support column 44 will push the fixing wheel 47 upward through the fixing plate 43 and the disc 61. The fixing wheel 47 will push the spring column 46 to slide upward on the fixing frame 41. When the fixing wheel 47 slides, it will compress the compression spring 48. Thus, under the action of the rebound force of the compression spring 48, the four sets of clamping blocks 45 can tightly fit the surface of the C-shaped steel from both sides, enhancing the clamping force of the C-shaped steel and improving the stability and fixation effect of the C-shaped steel during the welding process.

[0034] When clamping the J-shaped steel, when one set of sliding rods 23 slides downward, the four sets of clamping blocks 45 connected to it will also move downward simultaneously, such as... Figure 1 and Figure 2 As shown. Because the flange ends of the J-shaped steel are bent upward to form a rolled edge structure, during the downward pressing process, two sets of clamping blocks 45 on one side will first contact the rolled edge of the J-shaped steel. At the moment of contact, the rolled edge generates a reaction force on the clamping block 45, pushing the corresponding support column 44 to move upward, thereby causing the fixing plate 43 to tilt.

[0035] The tilting of the fixed plate 43 causes the disc 61 to deflect synchronously. The deflected disc 61 further applies an upward compressive force to the fixed wheel 47 on the same side, causing the fixed wheel 47 to push the spring column 46 to slide upward along the fixed frame 41. During this process, the fixed wheel 47 compresses the corresponding compression spring 48, forming an elastic buffer.

[0036] As the sliding rod 23 continues to move downwards, the two sets of clamping blocks 45 on the other side gradually contact the upper surface of the J-shaped steel, ultimately achieving synchronous clamping at four points. Even with some irregularity in the shape of the J-shaped steel, the four sets of clamping blocks 45 can still fit tightly against its surface under the action of the elastic structure, applying clamping force evenly, thereby significantly enhancing the stability of clamping and the structural fixation effect during welding. This design allows the clamping unit 4 to adapt to different models of forklift mast steel, effectively improving the versatility and applicability of the welding deformation control fixture.

[0037] In one embodiment of the present invention, such as Figure 6 , 7 As shown in Figures 8 and 9, the automatic clamping unit 7 includes: L-shaped frame 71 is fixed on the body 1, and at least two sets of rotating shafts 72 are rotatably connected inside, with ratchet wheels 11 fixed on the surface of the rotating shafts 72. The hydraulic cylinder 73 is fixed to the inner wall of the L-shaped frame 71. The hydraulic cylinder 73 has two sets of hydraulic oil grooves 74 inside, and the two sets of hydraulic oil grooves 74 are connected by a flow channel 75. A sliding plug 78 is slidably connected inside the hydraulic oil groove 74, and the sliding plug 78 and the inner wall of the hydraulic oil groove 74 are connected by a spring 79. The rotating frame 76 is fixed on the rotating shaft 72. Arc-shaped frames 77 are connected to both ends of the rotating frame 76. The ends of the two sets of arc-shaped frames 77 are fixedly connected to the sliding plugs 78.

[0038] In this embodiment, when welding the forklift mast steel, such as Figure 1 As shown, the forklift mast steel slides along the ratchet wheel 11 into the machine body 1. Due to the structural characteristics of the ratchet wheel 11, the forklift mast steel can slide along the ratchet wheel 11. When the forklift mast steel slides in the opposite direction, the forklift mast steel will be jammed under the action of the two sets of ratchet wheels 11, thereby restricting the movement of the forklift mast steel and improving the stability of the forklift mast steel.

[0039] like Figure 8As shown, when the forklift mast steel slides along the ratchet wheel 11 into the machine body 1, the ratchet wheel 11 will drive the rotating shaft 72 to rotate on the L-shaped frame 71 under the action of both sides of the forklift mast steel. The rotating shaft 72 will drive the arc frame 77 to rotate synchronously through the rotating frame 76. As a result, the arc frame 77 will drive its two sets of sliding plugs 78 to slide inside the hydraulic oil groove 74. When the sliding plugs 78 slide, they will squeeze the hydraulic oil inside one set of hydraulic oil grooves 74 into the other set of hydraulic oil grooves 74 through the flow channel 75. At the same time, the sliding plugs 78 will compress the spring 79.

[0040] When the forklift mast steel slides to the designated position, under the elastic force of spring 79, the sliding plug 78 slides in the opposite direction within the hydraulic oil groove 74. The arc-shaped frame 77 drives the rotating shaft 72 to rotate in the opposite direction via the rotating frame 76. This causes the rotating shaft 72 to reset the ratchet wheel 11, ensuring that the ratchet wheel 11 makes tight contact with the surface of the forklift mast steel. During welding of the forklift mast steel... On the one hand, due to the structural characteristics of the ratchet wheel 11, the forklift mast steel is locked by the ratchet wheel 11, restricting the movement of the forklift mast steel. On the other hand, when the forklift mast steel has a slight tendency to reverse displacement due to thermal stress or external force during the welding process, it will try to push the ratchet wheel 11 to rotate in the opposite direction, thereby driving the rotating shaft 72, rotating frame 76 and arc frame 77 to work together, causing the sliding plug 78 on one side to squeeze the hydraulic oil in the hydraulic oil groove 74. However, due to the large flow resistance of the hydraulic oil in the flow channel 75, the hydraulic oil cannot complete the rapid distribution between the two hydraulic oil grooves 74 in time through the flow channel 75, forming an instantaneous hydraulic locking effect, which hinders the displacement of the sliding plug 78, and thus restricts the reverse rotation of the ratchet wheel 11.

[0041] The ratchet wheel 11, with its dual function of locking and hydraulic damping, secures the forklift mast steel frame through both structural limiting and dynamic buffering. The ratchet wheel 11 ensures basic restriction of reverse displacement, while the hydraulic damping absorbs minor vibrations and displacement impacts generated during welding, preventing localized wear caused by hard contact between the ratchet wheel 11 and the forklift mast steel frame surface, and further suppressing minor vibrations of the forklift mast steel frame.

[0042] Furthermore, during the flow of hydraulic oil within the flow channel 75, some energy is consumed through friction with the inner wall of the flow channel 75 and internal friction between hydraulic oil molecules. This converts the vibrational kinetic energy of the forklift mast steel into heat energy and dissipates it, further weakening vibration transmission and providing a stable working environment for welding. This dual locking mechanism not only improves the positioning accuracy of the forklift mast steel during the welding process but also reduces the risk of welding defects caused by steel swaying, ensuring the quality and strength of the welded joint.

[0043] In one embodiment of the present invention, such as Figure 5As shown, a cooling unit 5 is installed on the clamping unit 4. The cooling unit 5 is used to cool the clamping block 45. The cooling unit 5 includes: A fixed cylinder 51 is connected to the lower side of the fixed frame 41, and a sliding piston 52 is sealed inside. An air inlet pipe 511 and an exhaust pipe 512 are respectively connected to the two sides of the fixed cylinder 51. Both the air inlet pipe 511 and the exhaust pipe 512 are connected to the fixed cylinder 51 through a one-way valve. An elastic element 53 is connected between the piston 52 and the inner wall of the fixed cylinder 51. The elastic element 53 is a spring. The support rod 54 is fixed to the lower side of the piston 52, and the end is connected to the clamping plate 55.

[0044] In this embodiment, as the fixing frame 41 descends, the fixing cylinder 51 moves downward accordingly, causing the support rod 54 to slide downward via the piston 52 inside. The support rod 54 then causes the clamping plate 55 at its end to descend synchronously until the clamping plate 55 contacts the upper surface of the C-shaped or J-shaped steel. Under the action of the forklift mast steel, the clamping plate 55, through the support rod 54, causes the piston 52 to slide upward inside the fixing cylinder 51. During this sliding motion, the piston 52 compresses the elastic element 53. Under the rebound force of the elastic element 53, the clamping plate 55 can tightly conform to the upper side of the forklift mast steel. As the piston 52 moves upward, the space between its top and the inner wall of the fixing cylinder 51 gradually decreases, and the internal gas is discharged through the exhaust pipe 512. During the exhaust process, the airflow passes over the surface of the clamping block 45, carrying away the accumulated heat and achieving rapid cooling, which helps extend the service life of the clamping block 45.

[0045] The working principle of this invention is as follows: During welding of the forklift mast steel, it slides into the machine body 1 along the direction of the ratchet wheel 11. The ratchet wheel 11 structure restricts its reverse sliding, achieving basic locking and positioning. At the same time, the sliding of the steel will drive the rotating shaft 72 and the arc frame 77 to work together, causing the sliding plug 78 to squeeze the hydraulic oil in the hydraulic oil groove 74 and compress the spring 79. After the forklift mast steel is in place, the spring 79 returns to its original position, allowing the ratchet wheel 11 to tightly fit against the surface of the steel. During welding, on the one hand, the ratchet wheel 11 locks and restricts the movement of the steel; on the other hand, if the forklift mast steel has a slight tendency to reverse displacement, the hydraulic oil has high flow resistance in the flow channel 75, forming an instantaneous hydraulic lock, thus fixing the forklift mast steel. It can also absorb small vibrations and consume vibration energy, improving the welding positioning accuracy.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding deformation control jig for a forklift mast profile, characterized by, Include: The body (1), the pawl wheel (11) is rotatably connected on the body (1), the pawl wheel (11) is slidably connected on the surface of the forklift mast section steel; Double position unit (2), slidably connected on the body (1), the end of double position unit (2) is provided with clamp unit (4), the double position unit (2) is used for alternately clamping and fixing the upper surface of the forklift mast section steel by clamp unit (4); Automatic clamping unit (7), rotatably connected on the body (1), and the pawl wheel (11) is connected, used for cooperating with the pawl wheel (11) to realize the automatic clamping and fixing of both sides of the forklift mast section steel.

2. The welding distortion control fixture for a forklift mast profile steel according to claim 1, wherein The double position unit (2) comprises: Support (21), fixed on the body (1), the middle part of support (21) is fixed with support plate (22); Slide rod (23), slidably connected on the support plate (22), the upper end of slide rod (23) is provided with rolling wheel (231); Cylinder (24), installed on the top of support (21); Slide groove (26), opened in the top of support (21), slidably connected with sliding piece (25) in the inside, one side of sliding piece (25) is fixed on the output end of cylinder (24); Slide frame (27), slidably connected on the inner wall of the top of support (21), and slide frame (27) and sliding piece (25) are fixedly connected; Arc slot (271), opened on slide frame (27), one end of rolling wheel (231) is slidably connected on the surface of arc slot (271), the other end of rolling wheel (231) is connected on support plate (22) through elastic element.

3. The welding distortion control fixture for a forklift mast profile steel according to claim 2, wherein The upper end of slide frame (27) is fixed with limiting unit (3), the limiting unit (3) is used for guiding and limiting slide frame (27), the limiting unit (3) comprises: Slide rail (31), connected on the top inner wall of support (21); Slide block (32), fixed on slide frame (27), slidably connected on slide rail (31).

4. The welding distortion control fixture for a forklift mast profile steel according to claim 3, characterized by, The clamp unit (4) comprises: Fixed frame (41), connected on the lower end of slide rod (23), four groups of spring columns (46) are slidably connected on fixed frame (41); Fixed wheel (47), fixed on the end of spring column (46), fixed wheel (47) and fixed frame (41) are connected through compression spring (48); Extension rod (42), fixedly connected on the lower side of fixed frame (41), the end is connected with limiting frame (421); Fixed plate (43), slidably connected on the middle part of extension rod (42), the lower side of fixed plate (43) is connected with clamp block (45) through support column (44).

5. The welding distortion control fixture for a forklift mast profile steel according to claim 4, wherein The surface of extension rod (42) is slidably connected with disc (61), the upper surface of disc (61) is slidably connected with fixed wheel (47), the lower surface of disc (61) is slidably connected with fixed plate (43), disc (61) and fixed plate (43) are provided with avoiding hole (62), extension rod (42) penetrates through two groups of avoiding hole (62), the avoiding hole (62) is used for free movement of extension rod (42).

6. The welding distortion control fixture for a forklift mast profile steel according to claim 5, wherein The clamp unit (4) is provided with a cooling unit (5) for cooling the clamp block (45), and the cooling unit (5) comprises: A fixed cylinder (51) is connected to the lower side of the fixed frame (41), and a slidable piston member (52) is sealingly connected in the fixed cylinder (51); An elastic member (53) is connected between the piston member (52) and the inner wall of the fixed cylinder (51); A support rod (54) is fixed to the lower side of the piston member (52), and a clamping plate (55) is connected to the end of the support rod (54).

7. The welding distortion control fixture for a forklift mast profile steel according to claim 6, wherein The fixed cylinder (51) is communicated with an air inlet pipe (511) and an air outlet pipe (512) on both sides, and the air inlet pipe (511) and the air outlet pipe (512) are connected to the fixed cylinder (51) through one-way valves.

8. The welding distortion control fixture for a forklift mast profile steel according to claim 1, wherein The automatic clamping unit (7) comprises: An L-shaped frame (71) is fixed to the machine body (1), at least two groups of rotating shafts (72) are rotatably connected in the L-shaped frame (71), and a pawl wheel (11) is fixed to the surface of the rotating shaft (72); A hydraulic oil cylinder (73) is fixed to the inner wall of the L-shaped frame (71), two groups of hydraulic oil grooves (74) are formed in the hydraulic oil cylinder (73), and the two groups of hydraulic oil grooves (74) are communicated through a flow channel (75); A sliding plug (78) is slidingly connected in the hydraulic oil groove (74), and the sliding plug (78) and the inner wall of the hydraulic oil groove (74) are connected through a spring (79); A rotating frame (76) is fixed to the rotating shaft (72), and arc-shaped frames (77) are connected to both ends of the rotating frame (76), and the ends of the two groups of arc-shaped frames (77) are fixedly connected with the sliding plug (78).

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