Forklift frame welding device

Abstract

The present invention relates to the field of welding positioning, and in particular to a forklift frame welding device. The technical problem of the present invention is that the process of adjusting parts is relatively cumbersome, and when fixing two parts, the two parts are prone to relative displacement, which will lead to poor frame welding effect. A forklift frame welding device includes a cross frame, an oblique frame and a mounting frame, etc.; the cross frame is L-shaped, and an oblique frame is installed on one side of the cross frame, and a mounting frame is installed on the oblique frame. The present invention corrects and fixes the frame plate body through a positioning frame, and drives the arc plate body to move through two ball bearings. The other side of the arc plate body will fit closely with one side of the frame plate body, and the roller will drive the arc plate body to move. In this way, the frame plate body and the arc plate body can be corrected and fixed multiple times, so that the frame plate body and the arc plate body can be more accurately aligned and more firmly fixed, thereby improving the efficiency and quality of welding the frame plate body and the arc plate body.

Description

Technical Field

[0001] The invention relates to the field of welding positioning, and in particular to a forklift frame welding device. Background Art

[0002] The positioning tooling can keep each part in the correct position and angle, ensuring that the dimensions after welding meet the design requirements. The frame is the basic component of the forklift, and its dimensional deviation will affect the assembly quality and performance of the entire vehicle.

[0003] In the current process of welding a vehicle frame, due to the special shape of the frame parts, one of the parts is generally corrected and fixed first, and then the position and angle of the other part are continuously adjusted to make the two parts fit closely, and then a special positioning tool is used to fix the two parts together, and then the two parts are welded; however, the process of adjusting the parts is relatively cumbersome, and when the two parts are fixed, the two parts are prone to relative displacement, which will result in poor frame welding effect and reduce the efficiency of frame welding. Summary of the invention

[0004] In order to overcome the cumbersome process of parts adjustment, when two parts are fixed, the two parts are prone to relative displacement, which will lead to poor frame welding effect. In order to solve the above-mentioned technical problems, a forklift frame welding device is provided, which can correct and fix the two parts multiple times, avoid the relative displacement of the two parts when fixed, and improve the welding effect and efficiency of the frame.

[0005] The technical implementation scheme of the present invention is: a forklift frame welding device, including a cross frame, an oblique frame, a mounting frame, an arc-shaped hollow frame, a lower support plate, a positioning mechanism and a swinging mechanism. The cross frame is L-shaped, and an oblique frame is installed on one side of the cross frame, and a mounting frame is installed on the oblique frame. An arc-shaped hollow frame is installed on the mounting frame, and a lower support plate is installed on the lower part of the arc-shaped hollow frame. A frame plate body is placed on the cross frame, and an arc-shaped plate body is placed on the arc-shaped hollow frame. One side of the frame plate body is tightly fitted with one side of the arc-shaped plate body. A positioning mechanism is provided on the cross frame, and the positioning mechanism is used to position the frame plate body. A swinging mechanism is provided on the oblique frame and the arc-shaped hollow frame, and the swinging mechanism is used to correct and position the arc-shaped plate body.

[0006] Optionally, the positioning mechanism includes a positioning frame and a hydraulic push rod. A positioning frame is slidably provided on the cross frame, two inclined surfaces are provided on one side of the positioning frame, a hydraulic push rod is installed at the bottom of the cross frame, and the telescopic rod on the hydraulic push rod is fixedly connected to the positioning frame.

[0007] Optionally, the swing mechanism includes a hollow rotating shaft, a swing frame, a roller, a servo motor and a transmission assembly. A hollow rotating shaft is rotatably provided on the inclined frame. A swing frame is installed on the side of the hollow rotating shaft close to the arc-shaped hollow frame. The swing frame is slidingly connected to the arc-shaped hollow frame. Two rollers are rotatably provided on the swing frame. The two rollers are in contact with the inner side surface of the arc-shaped plate body. A servo motor is installed on the inclined frame. A transmission assembly is connected between the output shaft of the servo motor and one end of the hollow rotating shaft.

[0008] Optionally, the transmission assembly consists of two pulleys and a flat belt, the output shaft of the servo motor and one end of the hollow shaft are respectively equipped with a pulley, and a flat belt is wound between the two pulleys.

[0009] Optionally, a pressing mechanism is also included, which is arranged on the inclined frame and the hollow rotating shaft. The pressing mechanism is used to press the arc plate body. The pressing mechanism includes a sliding shaft, a hollow pressing frame, balls, a slide and an electric push rod. A sliding shaft is slidably provided on the hollow rotating shaft, a hollow pressing frame is installed on the side of the sliding shaft away from the inclined frame, two balls are rollingly provided on the side of the hollow pressing frame close to the arc plate body, a slide is installed on the end of the sliding shaft close to the inclined frame, the slide is slidably connected to the inclined frame, an electric push rod is fixedly installed on the inclined frame, and the telescopic rod on the electric push rod is fixedly connected to the slide.

[0010] Optionally, a correction mechanism is also included, which is arranged on a hollow rotating shaft, a hollow pressing frame and a sliding frame, and the correction mechanism is used to correct the arc plate body. The correction mechanism includes a gear, a correction plate, a rack 1, a correction wheel, a sliding frame, an active rack, a roller and an arc groove frame. A gear is rotatably provided in the hollow pressing frame, and two correction plates are slidably provided on the hollow pressing frame. A rack 1 is installed on the side where the two correction plates are close to each other, and the two racks 1 are staggered. The two racks 1 are respectively meshed with the two sides of the gear. A correction wheel is rotatably provided on the side where the two correction plates are away from each other, and a sliding frame is slidably provided on the sliding frame. An active rack is fixedly installed on the sliding frame, and the active rack slidably passes through the hollow pressing frame, and the active rack is located between the two racks 1, and the active rack is meshed with the middle part of the gear. A roller is rotatably provided on the sliding frame, and an arc groove frame is installed on the side of the hollow rotating shaft close to the hollow pressing frame.

[0011] Optionally, the arc slot frame consists of a large arc slot and a small arc slot, and the hollow rotating shaft is located in the large arc slot of the arc slot frame.

[0012] Optionally, a pressing plate is further included. A pressing plate is installed on each side of the hollow pressing frame that is away from each other. The two pressing plates are slidably connected to the arc-shaped hollow frame.

[0013] Optionally, a push plate and a rubber pad are also included. A push plate is fixedly installed on the hollow rotating shaft, and a rubber pad is installed on one side of the push plate close to the arc-shaped plate body.

[0014] The beneficial effects of the present invention are as follows: 1. The frame plate body is corrected and fixed by the positioning frame, and the arc plate body is driven to move by two ball bearings, so that the other side of the arc plate body will fit closely with one side of the frame plate body, and the roller will drive the arc plate body to move so that the bottom of the arc plate body can fit closely with the lower abutment plate, so that the frame plate body and the arc plate body can be corrected and fixed multiple times, so that the frame plate body and the arc plate body can be more accurately aligned and more firmly fixed, thereby improving the efficiency and quality of welding the frame plate body and the arc plate body.

[0015] 2. The two correction plates and the two correction wheels are driven by the two racks to move toward the direction of the slide, and the two correction wheels can contact the outer side of the arc plate body. The arc plate body can be clamped, limited and fixed by the two rollers and the two correction wheels, so that the arc plate body can be corrected again. At the same time, the arc plate body is also guided, so that the arc plate body moves more smoothly and will not deviate, thereby further improving the efficiency and quality of the welding of the frame plate body and the arc plate body.

[0016] 3. The frame plate body can be pressed by two pressing plates to make the frame plate body fit more closely with the arc-shaped hollow frame, and the position of the frame plate body can be further corrected. The rubber pad will push the bottom of the arc-shaped plate body to contact the lower abutment plate, so that the arc-shaped plate body can be positioned and corrected again, thereby further improving the efficiency and quality of welding the frame plate body and the arc-shaped plate body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the swing mechanism and the pressing mechanism of the present invention.

[0019] Figure 3 It is a three-dimensional structural schematic diagram of the frame plate body, the arc-shaped plate body, the pressing mechanism and the correcting mechanism of the present invention.

[0020] Figure 4 It is a three-dimensional structural schematic diagram of the horizontal frame, the oblique frame, the mounting frame and the arc-shaped hollow frame of the present invention.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the frame plate body and the arc-shaped plate body of the present invention.

[0022] Figure 6It is a schematic diagram of the disassembled three-dimensional structure of some parts of the swing mechanism and the pressing mechanism of the present invention.

[0023] Figure 7 It is a three-dimensional structural schematic diagram of the positioning mechanism, the swing mechanism and the pressing mechanism of the present invention.

[0024] Figure 8 It is a three-dimensional structural schematic diagram of the cross frame, the positioning frame and the hydraulic push rod of the present invention.

[0025] Fig. 9 It is a schematic diagram of the three-dimensional structure of the correction mechanism of the present invention.

[0026] Fig.10 It is a schematic diagram of the three-dimensional structure of the pressing mechanism of the present invention.

[0027] Fig.11 It is a schematic diagram of the cross-sectional three-dimensional structure of the correction mechanism of the present invention.

[0028] Fig.12 It is a schematic diagram of the disassembled three-dimensional structure of some parts of the correction mechanism, the pressing plate and the pushing plate of the present invention.

[0029] The markings of the components in the accompanying drawings are as follows: 1: horizontal frame, 2: oblique frame, 3: mounting frame, 4: arc-shaped hollow frame, 5: lower support plate, 61: frame plate body, 62: arc-shaped plate body, 71: positioning frame, 72: hydraulic push rod, 83: hollow rotating shaft, 84: swing frame, 85: roller, 86: servo motor, 87: transmission assembly, 91: sliding shaft, 92: hollow pressing frame, 93: ball bearing, 94: slide frame, 95: electric push rod, 101: gear, 102: correction plate, 103: rack 1, 104: correction wheel, 105: sliding frame, 106: active rack, 107: roller, 108: arc slot frame, 11: pressing plate, 12: pushing plate, 13: rubber pad. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0031] Embodiment 1: A forklift frame welding device, such as Figure 1-Figure 10As shown, it includes a cross frame 1, an oblique frame 2, a mounting frame 3, an arc-shaped hollow frame 4, a lower support plate 5, a positioning mechanism and a swinging mechanism. The cross frame 1 is L-shaped, and an oblique frame 2 is installed on one side of the cross frame 1 by bolts. A mounting frame 3 is installed on the oblique frame 2 by bolts, and an arc-shaped hollow frame 4 is installed on the mounting frame 3. A lower support plate 5 is installed on the lower part of the arc-shaped hollow frame 4. A frame plate body 61 is placed on the cross frame 1, and an arc-shaped plate body 62 is placed on the arc-shaped hollow frame 4. One side of the frame plate body 61 is tightly fitted with one side of the arc-shaped plate body 62. A positioning mechanism is provided on the cross frame 1, and the positioning mechanism is used to position the frame plate body 61. The oblique frame 2 and the arc-shaped hollow frame 4 are provided with a swinging mechanism, and the swinging mechanism is used to correct and position the arc-shaped plate body 62.

[0032] The positioning mechanism includes a positioning frame 71 and a hydraulic push rod 72. A positioning frame 71 is slidably provided on the cross frame 1 for correcting and positioning the frame plate body 61. Two inclined surfaces are provided on one side of the positioning frame 71. A hydraulic push rod 72 is installed at the bottom of the cross frame 1 by bolts, and the telescopic rod on the hydraulic push rod 72 is fixedly connected to the positioning frame 71.

[0033] The swing mechanism includes a hollow rotating shaft 83, a swing frame 84, a roller 85, a servo motor 86 and a transmission assembly 87. A hollow rotating shaft 83 is rotatably provided on the inclined frame 2 through a bearing. A swing frame 84 is installed on the side of the hollow rotating shaft 83 close to the arc hollow frame 4. The swing frame 84 is slidingly connected to the arc hollow frame 4. Two rollers 85 for correcting the arc plate body 62 are rotatably provided on the swing frame 84. The two rollers 85 are in contact with the inner side surface of the arc plate body 62. A servo motor 86 is installed on the inclined frame 2. A transmission assembly 87 is connected between the output shaft of the servo motor 86 and one end of the hollow rotating shaft 83.

[0034] The transmission assembly 87 is composed of two pulleys and a flat belt. The output shaft of the servo motor 86 and one end of the hollow shaft 83 are respectively equipped with a pulley, and a flat belt is wound between the two pulleys.

[0035] It also includes a pressing mechanism, which is arranged on the inclined frame 2 and the hollow rotating shaft 83. The pressing mechanism is used to press the arc plate body 62. The pressing mechanism includes a sliding shaft 91, a hollow pressing frame 92, a ball 93, a slide 94 and an electric push rod 95. A sliding shaft 91 is slidably provided on the hollow rotating shaft 83, and the sliding shaft 91 will slide along the hollow rotating shaft 83. A hollow pressing frame 92 is installed on the side of the sliding shaft 91 away from the inclined frame 2. Two balls 93 are rollingly provided on the side of the hollow pressing frame 92 close to the arc plate body 62. A slide 94 is installed on the end of the sliding shaft 91 close to the inclined frame 2. The slide 94 is slidably connected to the inclined frame 2, and the slide 94 will slide along the inclined frame 2. An electric push rod 95 is fixedly installed on the inclined frame 2 by bolts, and the telescopic rod on the electric push rod 95 is fixedly connected to the slide 94.

[0036] When welding the frame plate body 61 and the arc plate body 62, the operator first places the frame plate body 61 on the cross frame 1, and then controls the telescopic rod of the hydraulic push rod 72 to shorten, and the telescopic rod of the hydraulic push rod 72 drives the positioning frame 71 to move in the direction close to the inclined frame 2. Under the action of the two inclined surfaces on the positioning frame 71, the frame plate body 61 can be corrected, and the positioning frame 71 pushes the frame plate body 61 to move in the direction close to the inclined frame 2. After the frame plate body 61 contacts the arc hollow frame 4 and the lower support plate 5, the hydraulic The telescopic rod of the push rod 72 stops shortening, and then the arc plate body 62 is placed on the two rollers 85, the lower part of the arc plate body 62 contacts the lower abutment plate 5, and then the operator controls the telescopic rod of the electric push rod 95 to extend, and the telescopic rod of the electric push rod 95 drives the slide 94, the sliding shaft 91, the hollow pressing frame 92 and the two balls 93 to move in the direction close to the arc plate body 62, and the two balls 93 will drive the arc plate body 62 to move, and the other side of the arc plate body 62 will be closely fitted with one side of the frame plate body 61, and the electric push rod 95 will extend. The telescopic rod of the rod 95 stops extending, and then the operator controls the output shaft of the servo motor 86 to rotate 20 degrees and then stop. The output shaft of the servo motor 86 drives the hollow shaft 83, the swing frame 84 and the roller 85 to rotate 20 degrees and then stop through the transmission assembly 87. Since the roller 85 is in close contact with the inner side of the arc-shaped plate body 62, the roller 85 will drive the arc-shaped plate body 62 to move, so that the bottom of the arc-shaped plate body 62 can fit closely with the lower plate 5. The frame plate body 61 is corrected and fixed by the positioning frame 71. The bead 93 drives the arc plate body 62 to move, and the other side of the arc plate body 62 will fit closely with one side of the frame plate body 61. The roller 85 drives the arc plate body 62 to move, so that the bottom of the arc plate body 62 can fit closely with the lower abutment plate 5. In this way, the frame plate body 61 and the arc plate body 62 can be corrected and fixed multiple times, so that the frame plate body 61 and the arc plate body 62 can be more accurately aligned and more firmly fixed, thereby improving the efficiency and quality of welding the frame plate body 61 and the arc plate body 62.After the frame plate body 61 and the arc plate body 62 are welded, the operator controls the telescopic rod of the hydraulic push rod 72 to extend, and the telescopic rod of the hydraulic push rod 72 drives the positioning frame 71 to move away from the oblique frame 2, and the positioning frame 71 will be separated from the frame plate body 61. After the positioning frame 71 is reset, the telescopic rod of the hydraulic push rod 72 stops extending, and then the operator controls the telescopic rod of the electric push rod 95 to shorten, and the telescopic rod of the electric push rod 95 drives the slide frame 94, the sliding shaft 91, the hollow pressing frame 92 and the two ball bearings 93. Move in the direction away from the arc plate body 62. When the slide 94, the sliding shaft 91, the hollow pressing frame 92 and the two balls 93 are reset, the telescopic rod of the electric push rod 95 stops shortening. Then the operator controls the output shaft of the servo motor 86 to rotate 20 degrees in the opposite direction and then stop. The output shaft of the servo motor 86 drives the hollow rotating shaft 83, the swing frame 84 and the roller 85 to rotate 20 degrees in the opposite direction through the transmission assembly 87 and then stop. Then the operator can take out the welded frame plate body 61 and the arc plate body 62. ;

[0037] Embodiment 2: Based on embodiment 1, Figure 10-12 As shown, it also includes a correction mechanism, which is arranged on the hollow rotating shaft 83, the hollow pressing frame 92 and the sliding frame 94. The correction mechanism is used to correct the arc plate body 62. The correction mechanism includes a gear 101, a correction plate 102, a rack 103, a correction wheel 104, a sliding frame 105, an active rack 106, a roller 107 and an arc slot frame 108. A gear 101 is rotatably provided in the hollow pressing frame 92 through a bearing, and two correction plates 102 are slidably provided on the hollow pressing frame 92. A rack 103 is installed on one side of the two correction plates 102 that are close to each other. The two racks 103 are staggered. A 103 is respectively meshed with both sides of the gear 101, and a correction wheel 104 for correcting the arc plate body 62 is rotatably provided on the side of the two correction plates 102 away from each other. A sliding frame 105 is slidably provided on the slide 94, and an active rack 106 is fixedly installed on the sliding frame 105. The active rack 106 slides through the hollow pressing frame 92. The active rack 106 is located between the two racks 103. The active rack 106 is meshed with the middle part of the gear 101. A roller 107 is rotatably provided on the sliding frame 105, and an arc groove frame 108 is installed on the side of the hollow rotating shaft 83 close to the hollow pressing frame 92.

[0038] The arc slot frame 108 is composed of a large arc slot and a small arc slot, and the hollow rotating shaft 83 is located in the large arc slot of the arc slot frame 108 .

[0039] When the slide 94 moves, it drives the sliding shaft 91, the hollow pressing frame 92, the ball bearing 93, the gear 101, the correction plate 102, the rack 103, the correction wheel 104, the slide frame 105, the active rack 106 and the roller 107 to move. The roller 107 slides in the large arc groove of the arc groove frame 108. The two correction wheels 104 are located above the outer side of the arc plate body 62 at this time. When the hollow shaft 83 rotates, it drives the arc groove frame 108 to rotate. When the small arc groove on the arc groove frame 108 moves to the roller 107, the roller 107 slides in the large arc groove of the arc groove frame 108. 07 will move towards the direction close to the hollow pressing frame 92, the roller 107 drives the sliding frame 105 and the active rack 106 to move towards the direction close to the hollow pressing frame 92, the active rack 106 drives the gear 101 to rotate, the gear 101 drives the two racks 103 to move towards the direction close to the sliding frame 94, the two racks 103 drive the two correction plates 102 and the two correction wheels 104 to move towards the direction close to the sliding frame 94, and the two correction wheels 104 can contact the outer side of the arc plate body 62 through the two rollers. The wheel 85 and the two correction wheels 104 can clamp, limit and fix the arc plate body 62, so that the arc plate body 62 can be corrected again, and the arc plate body 62 can be guided at the same time, so that the arc plate body 62 moves more smoothly and will not deviate, thereby further improving the efficiency and quality of welding between the frame plate body 61 and the arc plate body 62; when the hollow shaft 83 rotates in the opposite direction, it drives the arc slot frame 108 to rotate in the opposite direction. When the large arc slot on the arc slot frame 108 moves to the roller 107, The roller 107 will move in the direction away from the hollow pressing frame 92, and the roller 107 drives the sliding frame 105 and the active rack 106 to move in the direction away from the hollow pressing frame 92. The active rack 106 drives the gear 101 to rotate in the opposite direction. The gear 101 drives the two racks 103 to move in the direction away from the sliding frame 94. The two racks 103 drive the two correction plates 102 and the two correction wheels 104 to move in the direction away from the sliding frame 94, and the two correction wheels 104 can be separated from the outer side of the arc plate body 62.

[0040] Embodiment 3: Based on embodiment 2, Figure 11-Figure 12 As shown, a pressing plate 11 is also included. A pressing plate 11 is installed on each side of the hollow pressing frame 92 that is away from each other. The two pressing plates 11 are slidably connected to the arc-shaped hollow frame 4.

[0041] It also includes a push plate 12 and a rubber pad 13 . The push plate 12 is fixedly mounted on the hollow rotating shaft 83 , and a rubber pad 13 is mounted on one side of the push plate 12 close to the arc-shaped plate body 62 .

[0042] When the hollow pressing frame 92 moves toward the arc-shaped plate body 62 , the two pressing plates 11 are driven to move, and the two pressing plates 11 can press the frame plate body 61 , so that the frame plate body 61 and the arc-shaped hollow frame 4 are more closely fitted, and the position of the frame plate body 61 is further corrected.

[0043] When the hollow shaft 83 rotates, it drives the pushing plate 12 and the rubber pad 13 to swing. After the rubber pad 13 contacts the upper side of the arc-shaped plate body 62, the rubber pad 13 will push the arc-shaped plate body 62 to move. Since the two rollers 85 and the two correction wheels 104 can clamp, limit and fix the arc-shaped plate body 62, and also guide the arc-shaped plate body 62, the arc-shaped plate body 62 will move more smoothly, and the rubber pad 13 will push the bottom of the arc-shaped plate body 62 to contact the lower abutment plate 5, so that the arc-shaped plate body 62 can be positioned and corrected again, thereby further improving the efficiency and quality of the welding of the frame plate body 61 and the arc-shaped plate body 62.

[0044] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A forklift frame welding device, characterized in that it includes A cross frame (1), an inclined frame (2), a mounting frame (3), an arc-shaped hollow frame (4), a lower support plate (5), a positioning mechanism and a swing mechanism, wherein the cross frame (1) is L-shaped, an inclined frame (2) is mounted on one side of the cross frame (1), a mounting frame (3) is mounted on the inclined frame (2), an arc-shaped hollow frame (4) is mounted on the mounting frame (3), a lower support plate (5) is mounted on the lower part of the arc-shaped hollow frame (4), a frame plate body (61) is placed on the cross frame (1), an arc-shaped plate body (62) is placed on the arc-shaped hollow frame (4), one side of the frame plate body (61) is tightly fitted with one side of the arc-shaped plate body (62), a positioning mechanism is provided on the cross frame (1), and the positioning mechanism is used to position the frame plate body (61), and a swing mechanism is provided on the inclined frame (2) and the arc-shaped hollow frame (4), and the swing mechanism is used to correct and position the arc-shaped plate body (62); The positioning mechanism comprises a positioning frame (71) and a hydraulic push rod (72); a positioning frame (71) is slidably provided on the cross frame (1); two inclined surfaces are provided on one side of the positioning frame (71); a hydraulic push rod (72) is installed at the bottom of the cross frame (1); and a telescopic rod on the hydraulic push rod (72) is fixedly connected to the positioning frame (71); The swing mechanism comprises a hollow rotating shaft (83), a swing frame (84), a roller (85), a servo motor (86) and a transmission assembly (87). A hollow rotating shaft (83) is rotatably provided on the inclined frame (2). A swing frame (84) is installed on the side of the hollow rotating shaft (83) close to the arc-shaped hollow frame (4). The swing frame (84) is slidably connected to the arc-shaped hollow frame (4). Two rollers (85) are rotatably provided on the swing frame (84). The two rollers (85) are in contact with the inner side surface of the arc-shaped plate body (62). A servo motor (86) is installed on the inclined frame (2). A transmission assembly (87) is connected between the output shaft of the servo motor (86) and one end of the hollow rotating shaft (83).

2. A forklift frame welding device as claimed in claim 1, characterized in that: The transmission assembly (87) is composed of two pulleys and a flat belt. The output shaft of the servo motor (86) and one end of the hollow shaft (83) are respectively provided with a pulley, and a flat belt is wound between the two pulleys.

3. A forklift frame welding device as claimed in claim 1, characterized in that: The invention also comprises a pressing mechanism, which is arranged on the inclined frame (2) and the hollow rotating shaft (83), and is used to press the arc plate body (62). The pressing mechanism comprises a sliding shaft (91), a hollow pressing frame (92), a ball (93), a slide frame (94) and an electric push rod (95). A sliding shaft (91) is slidably arranged on the hollow rotating shaft (83), a hollow pressing frame (92) is installed on the side of the sliding shaft (91) away from the inclined frame (2), two ball (93) are rollably arranged on the side of the hollow pressing frame (92) close to the arc plate body (62), a slide frame (94) is installed on one end of the sliding shaft (91) close to the inclined frame (2), the slide frame (94) is slidably connected to the inclined frame (2), an electric push rod (95) is fixedly installed on the inclined frame (2), and a telescopic rod on the electric push rod (95) is fixedly connected to the slide frame (94).

4. A forklift frame welding device as claimed in claim 3, characterized in that: The invention also includes a correction mechanism, which is arranged on a hollow rotating shaft (83), a hollow pressing frame (92) and a sliding frame (94). The correction mechanism is used to correct the arc plate body (62). The correction mechanism includes a gear (101), a correction plate (102), a rack (103), a correction wheel (104), a sliding frame (105), an active rack (106), a roller (107) and an arc groove frame (108). A gear (101) is rotatably arranged in the hollow pressing frame (92), two correction plates (102) are slidably arranged on the hollow pressing frame (92), a rack (103) is installed on the side of the two correction plates (102) close to each other, and the two racks (103) are arranged in a staggered manner. The two racks (103) are respectively meshed with the two sides of the gear (101), and a correction wheel (104) is rotatably provided on the side of the two correction plates (102) away from each other. A sliding frame (105) is slidably provided on the sliding frame (94), and an active rack (106) is fixedly installed on the sliding frame (105). The active rack (106) slides through the hollow pressing frame (92), and the active rack (106) is located between the two racks (103). The active rack (106) is meshed with the middle part of the gear (101), and a roller (107) is rotatably provided on the sliding frame (105). An arc slot frame (108) is installed on the side of the hollow rotating shaft (83) close to the hollow pressing frame (92).

5. A forklift frame welding device as claimed in claim 4, characterized in that: The arc slot frame (108) is composed of a large arc slot and a small arc slot, and the hollow rotating shaft (83) is located in the large arc slot of the arc slot frame (108).

6. A forklift frame welding device as claimed in claim 5, characterized in that: It also includes a pressing plate (11), one pressing plate (11) being installed on each side of the hollow pressing frame (92) that is away from each other, and the two pressing plates (11) are slidably connected to the arc-shaped hollow frame (4).

7. A forklift frame welding device as claimed in claim 1, characterized in that: It also includes a push plate (12) and a rubber pad (13). A push plate (12) is fixedly mounted on the hollow rotating shaft (83), and a rubber pad (13) is mounted on one side of the push plate (12) close to the arc-shaped plate body (62).

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