A welding deformation control clamp for forklift mast section steel

Abstract

The application discloses a welding deformation control clamp for a forklift mast profile steel and belongs to the technical field of forklift mast profile steel processing, which comprises a machine body, a ratchet wheel rotatably connected to the machine body, a double-station unit slidably connected to the machine body, a clamp unit installed at the end of the double-station unit, and an automatic clamping unit rotatably connected to the machine body and connected with the ratchet wheel. In the application, the forklift mast profile steel is slid into the machine body along the direction of the ratchet wheel during welding, and the structure of the ratchet wheel can limit the reverse sliding of the forklift mast profile steel to realize basic dead positioning. During welding, on the one hand, the ratchet wheel deadens and limits the movement of the forklift mast profile steel, and on the other hand, if the forklift mast profile steel has a slight reverse displacement trend, the flow resistance of hydraulic oil in the flow channel is large to form a transient hydraulic lock. The double effects of the ratchet wheel deadening and the hydraulic damping locking can not only fix the forklift mast profile steel through structural limiting and dynamic buffering, but also can absorb slight vibration and consume vibration energy, so that the quality and strength of a welding joint are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of forklift mast section steel processing, in particular to a welding deformation control clamp for forklift mast section steel. BACKGROUND

[0002] The forklift mast section steel welding clamp is a tooling device specially used for precise assembly and welding of forklift masts. The clamp usually includes a solid base frame and multiple sets of quick pressing clamps, which can reliably fix the mast channel steel and internal lining plate at the preset ideal position, thereby ensuring the welding quality and dimensional accuracy.

[0003] However, the overall or local shaking of the clamp caused by arc impact, welding machine high-frequency vibration and component thermal stress during welding can cause the positioning of the welded part to deviate, the weld forming to be poor, and even irreversible welding deformation to occur. Therefore, a damping and buffering module and a multi-point rigid support structure need to be added to the clamp design to solve the problems caused by clamp vibration and ensure the position stability and deformation controllability of the components during welding. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the embodiments of the present application is to provide a welding deformation control clamp for forklift mast section steel to solve the uneven clamping problem caused by structural differences and ensure the position stability and deformation controllability of the components during welding.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A welding deformation control clamp for forklift mast section steel comprises:

[0007] A machine body, a pawl wheel rotatably connected to the machine body, the pawl wheel being slidably connected to the surface of the forklift mast section steel;

[0008] A double-station unit slidably connected to the machine body, the end of the double-station unit being provided with a clamp unit, the double-station unit being used to alternately clamp and fix the upper surface of the forklift mast section steel through the clamp unit;

[0009] An automatic clamping unit rotatably connected to the machine body and connected to the pawl wheel, used to automatically clamp and fix both sides of the forklift mast section steel in cooperation with the pawl wheel.

[0010] As a preferred technical scheme of the present application, the double-station unit comprises: a support fixed on the machine body, a support plate fixed at the middle part of the support, a sliding rod slidingly connected to the support plate, a rolling wheel installed at the upper end of the sliding rod, a gas cylinder installed at the top of the support, a sliding groove opened at the top of the support, a sliding piece slidingly connected inside the sliding groove, the sliding piece fixed on one side of the output end of the gas cylinder, a sliding frame slidingly connected to the inner wall of the top of the support, and the sliding frame and the sliding piece fixedly connected, an arc-shaped groove opened on the sliding frame, the rolling wheel slidingly connected at one end of the arc-shaped groove, and the other end of the rolling wheel connected to the support plate through an elastic piece.

[0011] As a preferred technical scheme of the present application, the upper end of the sliding frame is fixed with a limiting unit, the limiting unit is used for guiding and limiting the sliding frame, and the limiting unit comprises: a sliding rail fixed on the inner wall of the top of the support, and a sliding block fixed on the sliding frame and slidingly connected to the sliding rail.

[0012] As a preferred technical scheme of the present application, the clamp unit comprises: a fixed frame connected to the lower end of the sliding rod, four groups of spring columns slidingly connected to the fixed frame, a fixed wheel fixed at the end of the spring column and connected between the fixed frame through a compression spring, an extension rod fixedly connected to the lower side of the fixed frame and connected at the end with a limiting frame, and a fixed plate slidingly connected to the middle part of the extension rod and connected at the lower side with a clamping block through a support column.

[0013] As a preferred technical scheme of the present application, the surface of the extension rod is slidingly connected with a disc, the upper surface of the disc is slidingly connected with the fixed wheel, the lower surface of the disc is slidingly connected with the fixed plate, an avoiding hole is opened on the disc and the fixed plate, the extension rod penetrates through the two groups of avoiding holes, and the avoiding hole is used for free movement of the extension rod.

[0014] As a preferred technical scheme of the present application, a cooling unit is installed on the clamp unit, the cooling unit is used for cooling the clamping block, and the cooling unit comprises: a fixed cylinder connected to the lower side of the fixed frame, a slidable piston piece sealingly connected inside the fixed cylinder, an elastic piece connected between the piston piece and the inner wall of the fixed cylinder, a support rod fixed at the lower side of the piston piece and connected at the end with a clamping plate.

[0015] As a preferred technical scheme of the present application, the two sides of the fixed cylinder are respectively communicated with an air inlet pipe and an air outlet pipe, and the air inlet pipe and the air outlet pipe are connected to the fixed cylinder through a one-way valve.

[0016] As a preferred technical scheme of the present application, the automatic clamping unit comprises: an L-shaped frame fixed on the machine body, at least two groups of rotating shafts rotatably connected inside the L-shaped frame, and a pawl wheel fixed on the surface of the rotating shaft; a hydraulic oil cylinder fixed on the inner wall of the L-shaped frame, two groups of hydraulic oil grooves being formed inside the hydraulic oil cylinder and communicated through a flow channel; a sliding plug slidably connected inside the hydraulic oil groove, the sliding plug and the inner wall of the hydraulic oil groove being connected by a spring; and a rotating frame fixed on the rotating shaft, two ends of the rotating frame being respectively connected with arc-shaped frames, and the ends of the two groups of arc-shaped frames being fixedly connected with the sliding plug.

[0017] Compared with the prior art, the embodiment of the present application has the following beneficial effects: in the present application, the forklift mast section steel is slid into the machine body along the direction of the pawl wheel during welding, the pawl wheel structure can limit the reverse sliding to achieve basic dead positioning, and the sliding of the section steel will drive the rotating shaft and the arc-shaped frame to link, so that the sliding plug extrudes the hydraulic oil in the hydraulic oil groove and compresses the spring; after the forklift mast section steel is positioned, the spring is reset to make the pawl wheel closely adhere to the surface of the section steel. During welding, on the one hand, the pawl wheel deadlocks to limit the movement of the section steel, and on the other hand, if the forklift mast section steel has a slight reverse displacement trend, the hydraulic oil will form a temporary hydraulic lock due to the large flow resistance in the flow channel, thereby hindering the movement of the components. The double effects of the pawl wheel deadlocking and the hydraulic damping locking not only fix the forklift mast section steel through structural limiting and dynamic buffering, but also can absorb slight vibration, consume vibration energy and avoid hard contact and wear, thereby improving the welding positioning accuracy, reducing the welding defect risk, guaranteeing the quality and strength of the welded joint.

[0018] To make the structural features and effects of the present application clearer, the present application will be described in detail below with reference to the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A schematic diagram of the overall structure of a welding deformation control clamp for a forklift mast section steel is provided for the embodiment of the present application.

[0020] Figure 2 A front view of a welding deformation control clamp for a forklift mast section steel is provided for the present application.

[0021] Figure 3 A Figure 1 A partial enlarged view of part A.

[0022] Figure 4 A Figure 2 A partial enlarged view of part B.

[0023] Figure 5 A sectional view of a cooling unit of a welding deformation control clamp for a forklift mast section steel is provided for the present application.

[0024] Figure 6This invention provides a schematic diagram of the structure of a hydraulic cylinder for a welding deformation control fixture for forklift mast steel.

[0025] Figure 7 This invention provides a schematic diagram of the pawl wheel of a welding deformation control fixture for forklift mast steel.

[0026] 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.

[0027] 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

[0028] 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.

[0029] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0030] See Figures 1-8 A welding deformation control fixture for forklift mast steel, comprising:

[0031] 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.

[0032] 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.

[0033] 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.

[0034] In one embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the dual-station unit 2 includes:

[0035] The bracket 21 is fixed to the body 1, and a support plate 22 is fixed in the middle of the bracket 21;

[0036] 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;

[0037] Cylinder 24 is mounted on top of bracket 21;

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] In one embodiment of the present invention, such as Figure 3 and Figure 4 As shown, the clamping unit 4 includes:

[0045] 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;

[0046] 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;

[0047] 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;

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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:

[0055] 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.

[0056] 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.

[0057] A sliding plug 78 is slidably connected inside a 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.

[0058] The rotating frame 76 is fixed on the rotating shaft 72. The two ends of the rotating frame 76 are respectively connected to the arc-shaped frame 77, and the ends of the two sets of arc-shaped frames 77 are fixedly connected to the sliding plug 78.

[0059] 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.

[0060] like Figure 8 As 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.

[0061] 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...

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In one embodiment of the present invention, such as Figure 5 As 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:

[0066] 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.

[0067] 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.

[0068] The support rod 54 is fixed to the lower side of the piston 52, and the end is connected to the clamp 55.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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 fixture for forklift mast steel, characterized in that, include: The machine body (1) is 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). The end of the dual-station unit (2) is equipped with a clamping unit (4). 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) to cooperate with the ratchet wheel (11) to achieve automatic clamping and fixing of the two sides of the forklift mast steel. The dual-station unit (2) includes: A bracket (21) is fixed on the body (1), and a support plate (22) is fixed in the middle of the bracket (21); A slide rod (23) is slidably connected to a support plate (22), and a roller (231) is installed at the upper end of the slide rod (23); Cylinder (24), mounted on top of bracket (21); A slid groove (26) is provided 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 element (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. The automatic clamping unit (7) includes: The L-shaped frame (71) is fixed on the body (1) and has at least two sets of rotating shafts (72) rotatably connected inside. The ratchet wheel (11) is fixed on the surface of the rotating shaft (72). A hydraulic cylinder (73) is fixed to the inner wall of the L-shaped frame (71). Two sets of hydraulic oil grooves (74) are provided inside the hydraulic cylinder (73), 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); A rotating frame (76) is fixed on a rotating shaft (72). Two arc-shaped frames (77) are connected to the two ends of the rotating frame (76). The ends of the two sets of arc-shaped frames (77) are fixedly connected to the sliding plug (78).

2. The welding deformation control fixture for forklift mast steel according to claim 1, characterized in that, A limiting unit (3) is fixed to the upper end of the sliding frame (27). The limiting unit (3) is used to guide and limit the sliding frame (27). The limiting unit (3) includes: The slide rail (31) is connected to the top inner wall of the bracket (21); The slider (32) is fixed on the sliding frame (27) and is slidably connected to the slide rail (31).

3. The welding deformation control fixture for forklift mast steel according to claim 2, characterized in that, The clamping unit (4) includes: A fixed 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 fixed 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); An extension rod (42) is fixedly connected to the lower side of the fixed frame (41), and a limit frame (421) is connected to its end; A fixed plate (43) is slidably connected to the middle of the extension rod (42), and a clamping block (45) is connected to the lower side of the fixed plate (43) via a support column (44).

4. The welding deformation control fixture for forklift mast steel according to claim 3, characterized in that, The extension rod (42) is slidably connected to a disc (61). The upper surface of the disc (61) is slidably connected to a fixed wheel (47), and the lower surface of the disc (61) is slidably connected to a 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). The clearance holes (62) are used for the free movement of the extension rod (42).

5. The welding deformation control fixture for forklift mast steel according to claim 4, characterized in that, A cooling unit (5) is installed on the clamping unit (4), the cooling unit (5) is used to cool the clamping block (45), and 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 elastic element (53) is connected between the piston (52) and the inner wall of the fixed cylinder (51); The support rod (54) is fixed to the lower side of the piston (52) and has a clamp (55) connected to its end.

6. The welding deformation control fixture for forklift mast steel according to claim 5, characterized in that, The fixed cylinder (51) has an air inlet pipe (511) and an exhaust pipe (512) connected to its two sides respectively. Both the air inlet pipe (511) and the exhaust pipe (512) are connected to the fixed cylinder (51) through a one-way valve.

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