Trolley frame main beam ship-shaped welding device

Abstract

The utility model provides a trolley frame main beam ship-shaped welding device which comprises a roller carrier, a main beam welding device and a beam welding device. The turntable mechanism comprises at least one disc, the outer edge of the disc is in contact with the outer edge of the roller, and the disc is matched with the roller to drive the turntable mechanism to rotate; the carrier roller mechanism is fixedly connected with the rotary table mechanism and rotates along with the rotary table mechanism, and a trolley frame main beam to be welded is arranged on the carrier roller mechanism; the locking mechanism is fixed to the carrier roller mechanism, the locking mechanism is movably connected with locking blocks, the locking blocks are arranged on the two sides of the locking mechanism, and the locking blocks fix the trolley frame main beam from the two sides. The multi-angle welding deflection device can meet the functional requirement of multi-angle welding deflection when the trolley frame main beam is welded, can better adapt to the welding requirement of a box beam, improves the labor productivity of workers, and meanwhile guarantees the welding quality of welding seams.

Description

Technical Field

[0001] The utility model relates to the technical field of ship-shaped welding, in particular to a ship-shaped welding device for a main beam of a trolley frame. Background Art

[0002] As the main component of the quay crane product, the trolley frame has a main beam structure in the form of a box, with specifications concentrated at 6550mm*600mm*450mm. In the past processing, workers needed to flat weld the box beam on the ordinary tire frame. This method was limited by the welding position and angle, resulting in low work efficiency and unstable welding quality.

[0003] In view of this, the inventor of the present application has designed a boat-shaped welding device for the main beam of a small vehicle frame in order to overcome the above-mentioned technical problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects in the prior art that the welding operation of the main beam of a small vehicle frame is limited by the welding position and angle, resulting in low work efficiency and unstable welding quality, and to provide a boat-shaped welding device for the main beam of a small vehicle frame.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] The utility model provides a boat-shaped welding device for a main beam of a trolley frame, which is characterized in that the boat-shaped welding device comprises: a roller frame, on which a roller is arranged; a turntable mechanism, the turntable mechanism comprises at least one circular disk, the outer edge of the circular disk contacts the outer edge of the roller, and the circular disk cooperates with the roller to drive the turntable mechanism to rotate; a roller mechanism, the roller mechanism is fixedly connected to the turntable mechanism and rotates with the turntable mechanism, and the main beam of the trolley frame to be welded is placed on the roller mechanism; a locking mechanism, the locking mechanism is fixed to the roller mechanism, and a locking block is movably connected to the locking mechanism, the locking blocks are arranged on both sides of the locking mechanism, and the locking blocks fix the main beam of the trolley frame from both sides.

[0007] According to one embodiment of the utility model, the roller includes a driving roller and a driven roller, and the roller frame includes: a base; a driving roller frame, the driving roller frame is arranged on the base, and the driving roller is installed on the driving roller frame; a control mechanism, the control mechanism is connected to the driving roller and is used to control the rotation of the driving roller; and a driven roller frame, the driven roller frame is arranged on the base, and the driven roller is installed on the driven roller frame.

[0008] According to an embodiment of the utility model, a cycloid pinwheel reducer is further provided on the active roller frame, and the active roller is driven by the cycloid pinwheel reducer to achieve rotation.

[0009] According to an embodiment of the utility model, the turntable mechanism includes a connecting beam and at least two discs, two ends of the connecting beam are respectively connected to the corresponding discs, and the two ends of the connecting beam are located close to the outer edges of the discs.

[0010] According to one embodiment of the utility model, a braking mechanism is also provided on the roller frame, and the braking mechanism includes a brake base and a brake head, one end of the brake base is fixed on the base, and the brake head is fixedly connected to the other end of the brake base; an arc-shaped brake groove is also provided on the disc for accommodating the brake head.

[0011] According to an embodiment of the utility model, a main beam limiting hole is arranged on the disc, and the braking groove and the main beam limiting hole are respectively located on both sides of the connecting cross beam.

[0012] According to an embodiment of the utility model, the roller mechanism includes a main frame and a plurality of rollers, and the rollers are rotatably connected within the main frame.

[0013] According to one embodiment of the utility model, the locking mechanism includes: a support rod and a screw rod, both ends of the support rod and the screw rod are fixedly connected to the main frame; at least two slider assemblies, the bottom of each slider assembly is movably connected to the support rod, the screw rod is threadedly connected to the bottom of each slider assembly, and the two slider assemblies are symmetrically arranged; at least two locking blocks, one end of each locking block is movably connected to one of the slider assemblies, and the other end extends to the middle of the locking mechanism; the two locking blocks are symmetrically arranged, and there is a clamping space between the two locking blocks.

[0014] According to an embodiment of the utility model, hand wheels are arranged on both sides of the screw rod for controlling the rotation of the screw rod.

[0015] According to an embodiment of the present invention, a rocker is provided on each locking block for controlling the locking block to move toward or away from the clamping space.

[0016] The positive and progressive effects of the utility model are:

[0017] The boat-shaped welding device for the main beam of the trolley frame of the utility model has at least the following advantages:

[0018] The boat-shaped welding device for the main beam of the trolley frame of the utility model can meet the functional requirements of multi-angle welding displacement of the main beam of the trolley frame during welding, and can better adapt to the welding requirements of the box beam, thereby improving the labor productivity of the workers and ensuring the welding quality of the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0020] Figure 1 The utility model is a structural schematic diagram of a boat-shaped welding device for a main beam of a trolley frame.

[0021] Figure 2 The utility model is a structural schematic diagram of a roller frame in a boat-shaped welding device for a main beam of a trolley frame.

[0022] Figure 3 The utility model is a structural schematic diagram of a turntable mechanism in a boat-shaped welding device for a main beam of a trolley frame.

[0023] Figure 4 The utility model is a structural schematic diagram of a roller mechanism in a boat-shaped welding device for a main beam of a trolley frame.

[0024] Figure 5 The utility model is a structural schematic diagram of a locking mechanism in a boat-shaped welding device for a main beam of a trolley frame.

[0025] Fig. 6A The utility model is a schematic diagram of a turntable mechanism of the boat-shaped welding device for the main beam of a trolley frame being locked and fixed when in use.

[0026] Figure 6B yes Fig. 6A Enlarged view of part A.

[0027] Figure 7 It is a schematic diagram of the boat-shaped welding device for the main beam of a trolley frame of the utility model being installed in a working area when in use.

[0028] Fig. 8A The utility model is a schematic diagram of the relative positions of the boat-shaped welding device of the trolley frame main beam and the trolley frame main beam after the two are fixed.

[0029] Figure 8B yes Fig. 8A Enlarged view of part B.

[0030] Fig. 9 It is a schematic diagram of the first working state of the boat-shaped welding device for the main beam of the trolley frame of the utility model.

[0031] Fig.10It is a schematic diagram of the second working state of the boat-shaped welding device for the main beam of the trolley frame of the utility model.

[0032] Fig.11A It is a schematic diagram of the boat-shaped welding device of the main beam of the trolley frame of the utility model after the main beam of the trolley frame is released from fixation.

[0033] Fig. 11B yes Fig.11A Enlarged view of part C.

[0034] Fig.12 It is a schematic diagram of the utility model that the boat-shaped welding device for the main beam of the trolley frame pushes the main beam of the trolley frame to the next storage area when in use.

[0035] [Reference Signs]

[0036] Roller 100

[0037] Base 110

[0038] Active roller frame 120

[0039] Active roller 121

[0040] Cycloid pinwheel reducer 122

[0041] Driven roller frame 130

[0042] Driven roller 131

[0043] Roller 140

[0044] Braking mechanism 150

[0045] Brake base 151

[0046] Brake head 152

[0047] Turntable mechanism 200

[0048] Disc 210

[0049] Main beam limit hole 211

[0050] Brake groove 212

[0051] Connecting beam 220

[0052] Roller mechanism 300

[0053] Main frame 310

[0054] Roller 320

[0055] Roller limit block 330

[0056] Locking mechanism limit hole slot 340

[0057] Locking mechanism 400

[0058] Locking block 410

[0059] Joystick 411

[0060] Support rod 420

[0061] Screw 430

[0062] Handwheel 431

[0063] Slider assembly 440

[0064] Connecting column 441

[0065] Positioning block 450

[0066] Clamping space 460

[0067] Small car frame main beam 500

[0068] First weld 510

[0069] Second weld 520

[0070] Storage Area 610

[0071] Welding Zone 620 DETAILED DESCRIPTION

[0072] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0073] Embodiments of the utility model will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the utility model, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used in all drawings to represent the same or similar parts. In addition, although the terms used in the utility model are selected from well-known and commonly used terms, some of the terms mentioned in the utility model specification may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description herein. In addition, it is required to understand the utility model not only by the actual terms used, but also by the meaning implied by each term.

[0074] like Figure 1 to Figure 5 As shown, the utility model discloses a boat-shaped welding device for a main beam of a small vehicle frame, comprising:

[0075] A roller frame 100, on which a roller 140 is disposed;

[0076] The turntable mechanism 200 includes at least one disk 210. The outer edge of the disk 210 contacts the outer edge of the roller 140. The disk 210 cooperates with the roller 140 to drive the turntable mechanism 200 to rotate.

[0077] The roller mechanism 300 is fixedly connected to the turntable mechanism 200 and rotates together with the turntable mechanism 200. The main beam 500 of the trolley frame to be welded is placed on the roller mechanism 300;

[0078] The locking mechanism 400 is fixed to the roller mechanism 300. The locking mechanism 400 is movably connected with a locking block 410. The locking block 410 is arranged on both sides of the locking mechanism 400. The locking block 410 fixes the trolley frame main beam 500 from both sides.

[0079] The boat-shaped welding device for the main beam of the trolley frame of the utility model provides a rotation driving force for the boat-shaped welding device through the roller frame 100. The main beam 500 of the trolley frame can be easily rotated by the cooperation of the roller frame 100 and the turntable mechanism 200 to adapt to different welding angles and positions.

[0080] The turntable mechanism 200 enables the trolley frame main beam 500 to rotate passively, thereby ensuring the position accuracy of the trolley frame main beam 500.

[0081] The roller mechanism 300 is mainly used to carry the trolley frame main beam 500 and its accessories to ensure that they are stably located in a specified position.

[0082] The design of the locking mechanism 400 ensures that the trolley frame main beam 500 remains stable during the rotation process without displacement or shaking, further improving the safety and reliability of welding.

[0083] The boat-shaped welding device for the main beam of the trolley frame of the utility model can meet the functional requirements of multi-angle welding displacement of the main beam 500 of the trolley frame during welding.

[0084] like Figure 2 As shown, the utility model discloses a boat-shaped welding device for a main beam of a small vehicle frame, wherein the roller 140 includes a driving roller 121 and a driven roller 131, and the roller frame 100 includes:

[0085] Base 110;

[0086] A driving roller frame 120, the driving roller frame 120 is arranged on the base 110, and the driving roller 121 is installed on the driving roller frame 120;

[0087] A control mechanism, which is connected to the active roller 121 and is used to control the rotation of the active roller 121;

[0088] The driven roller frame 130 is disposed on the base 110 , and the driven roller 131 is installed on the driven roller frame 130 .

[0089] Preferably, the base 110 uses a pin to adjust the opening to adapt to the diameter of the disc 210; the active roller 121 of the active roller frame 120 is driven to rotate by a control mechanism; and the driven roller frame 130 rotates passively.

[0090] Preferably, the control mechanism may be a control box, which is a finished product provided by the manufacturer and is mainly located outside the equipment to ensure that the operator can observe and operate the equipment in a safe position.

[0091] The roller frame 100 of the above structure can provide rotational driving force for the boat-shaped welding device of the main beam of the trolley frame.

[0092] like Figure 2 As shown, the utility model discloses a boat-shaped welding device for a main beam of a trolley frame. A cycloid pinwheel reducer 122 is also provided on the active roller frame 120, and the active roller 121 is driven by the cycloid pinwheel reducer 122 to realize rotation.

[0093] Preferably, the active roller 121 of the active roller frame 120 is driven by a control mechanism and rotated via a cycloid pinwheel reducer 122 .

[0094] like Figure 3 As shown, the utility model discloses a boat-shaped welding device for the main beam of a small vehicle frame, and the turntable mechanism 200 includes a connecting beam 220 and at least two discs 210, and the two ends of the connecting beam 220 are respectively connected to the corresponding discs 210, and the two ends of the connecting beam 220 are located near the outer edge of the disc 210.

[0095] The function of the turntable mechanism 200 is to cooperate with the roller frame 100 to drive the trolley frame main beam 500 to flip, so as to realize the ship-shaped welding displacement.

[0096] like Figure 2 and Figure 3 As shown, the utility model discloses a boat-shaped welding device for the main beam of a trolley frame. A braking mechanism 150 is also provided on the roller frame 100. The braking mechanism 150 includes a braking base 151 and a braking head 152. One end of the braking base 151 is fixed on the base 110, and the braking head 152 is fixedly connected to the other end of the braking base 151; an arc-shaped braking groove 212 is also provided on the disc 210 for accommodating the braking head 152.

[0097] When the turntable mechanism 200 rotates, the brake head 152 can slide in the arc-shaped brake groove 212 , and at the same time, the brake head 152 can fix the disk 210 so that it cannot rotate, thereby locking the turntable mechanism 200 .

[0098] Preferably, the channel steel and the matching bolts and nuts form the brake mechanism 150, which can limit the rotation of the turntable mechanism 200. Specifically, the brake base 151 is a channel steel, and the bolts and nuts form the brake head 152. The channel steel is connected to one end of the bolt, and the bolt is inserted into the arc-shaped brake groove 212 with one side, and the nut is screwed into the bolt from the other side. By tightening the nut, the disc 210 can be locked, thereby locking the turntable mechanism 200.

[0099] The brake groove 212 cooperates with the brake mechanism 150 to limit the rotation angle of the trolley frame main beam 500, and also avoids the risk of collision caused by rotation.

[0100] like Figure 3 As shown, the utility model discloses a boat-shaped welding device for the main beam of a small vehicle frame, a main beam limiting hole 211 is arranged on a disc 210, and a brake groove 212 and the main beam limiting hole 211 are respectively located on both sides of a connecting cross beam 220.

[0101] Preferably, the main beam limiting hole 211 is located at the upper side of the connection between the disc 210 and the connecting beam 220 , and the brake groove 212 is located at the lower side of the connection between the disc 210 and the connecting beam 220 .

[0102] like Figure 4 As shown, the utility model discloses a boat-shaped welding device for a main beam of a small vehicle frame, wherein a roller mechanism 300 comprises a main frame 310 and a plurality of rollers 320 , and the rollers 320 are rotatably connected in the main frame 310 .

[0103] The roller mechanism 300 is mainly used to carry the trolley frame main beam 500 and its accessories to ensure that they are stably in the specified position. At the same time, through the transmission of multiple rollers 320, the relative position between the trolley frame main beam 500 and the ship-shaped welding equipment can be accurately controlled, thereby improving the accuracy and effect of welding.

[0104] Preferably, a roller limiting block 330 is further provided at the connection between the main frame 310 and the roller 320 ; a locking mechanism limiting hole groove 340 is also provided in the main frame 310 for installing the locking mechanism 400 .

[0105] like Figure 5 As shown, the utility model discloses a boat-shaped welding device for a main beam of a small vehicle frame, and the locking mechanism 400 includes:

[0106] A support rod 420 and a screw rod 430, both ends of which are fixedly connected to the main frame 310;

[0107] At least two slider assemblies 440, the bottom of each slider assembly 440 is movably connected to the support rod 420, the screw rod 430 is threadedly connected to the bottom of each slider assembly 440, and the two slider assemblies 440 are symmetrically arranged;

[0108] At least two locking blocks 410, one end of each locking block 410 is movably connected to one of the slider assemblies 440, and the other end extends to the middle of the locking mechanism 400; the two locking blocks 410 are symmetrically arranged, and there is a clamping space 460 between the two locking blocks 410, which can clamp and fix the trolley frame main beam 500 from both sides.

[0109] The locking mechanism 400 locks the main beam 500 of the trolley frame to ensure that the main beam 500 of the trolley frame is safe and reliable during the displacement process.

[0110] Preferably, positioning blocks 450 are provided on both sides of the support rod 420 and the screw rod 430, so as to fix the locking mechanism 400 on the main frame 310 of the roller mechanism 300.

[0111] like Figure 5 As shown, the utility model discloses a boat-shaped welding device for a main beam of a small vehicle frame, and hand wheels 431 are arranged on both sides of a screw rod 430 for controlling the rotation of the screw rod 430 .

[0112] like Figure 5 As shown, the utility model discloses a boat-shaped welding device for a main beam of a small vehicle frame, and a rocker 411 is arranged on each locking block 410 for controlling the locking block 410 to move toward or away from the clamping space 460 .

[0113] The arrangement of the hand wheel 431 and the rocker 411 improves the operability of the locking mechanism 400 .

[0114] The hand wheel 431 controls the screw rod 430 to rotate, so that the two slider assemblies 440 move toward the middle of the locking mechanism 400 or move away from the two sides, and the two slider assemblies 440 are adjusted to be located at appropriate positions.

[0115] The rocker 411 controls the locking block 410 to move toward or away from the clamping space 460 , and can clamp or release the trolley frame main beam 500 .

[0116] Preferably, the upper part of the slider assembly 440 has a connecting column 441, the connecting column 441 has an internal threaded hole, the locking block 410 has an external thread, the locking block 410 is connected to the threaded hole by engaging the internal and external threads, and the locking block 410 is controlled to move toward or away from the clamping space 460 by rotating the rocker 411.

[0117] When the boat-shaped welding device for the main beam of the trolley frame of the utility model is used, firstly, a suitable boat-shaped welding device for the main beam of the trolley frame is selected according to the welding operation requirements of the main beam of the trolley frame 500.

[0118] The specific operation of the boat-shaped welding device for the main beam of the small vehicle frame of the utility model when in use is as follows:

[0119] (1) The turntable mechanism 200 of the boat-shaped welding device for the trolley frame main beam is locked and fixed, and the trolley frame main beam 500 that has been spot-welded is moved to the storage area 610 of the welding area to wait for welding. Fig. 6A , Figure 6B and Figure 7 shown.

[0120] (2) Move the trolley frame main beam 500 to the welding area 620, adjust its relative position with the trolley frame main beam boat-shaped welding device, and lock and fix the trolley frame main beam 500, as shown in FIG. Fig. 8A and Figure 8B shown.

[0121] (3) Release the brake mechanism 150 of the boat-shaped welding device of the trolley frame main beam, start the control mechanism of the roller frame 100, and the roller frame 100 cooperates with the turntable mechanism 200 to drive the trolley frame main beam 500 to rotate 35 degrees in the clockwise direction D1, and then lock the brake mechanism 150, and then the welding operation of the first weld 510 of the trolley frame main beam 500 can be carried out. At this time, it is the first working state, such as Fig. 9 shown.

[0122] (4) Release the brake mechanism 150 of the boat-shaped welding device of the trolley frame main beam, start the control mechanism of the roller frame 100, and the roller frame 100 cooperates with the turntable mechanism 200 to drive the trolley frame main beam 500 to rotate 70 degrees in the clockwise direction D2, and then lock the brake mechanism 150, and then the welding operation of the second weld 520 of the trolley frame main beam 500 can be carried out. At this time, it is the second working state, such as Fig.10 As shown;

[0123] (5) After the welding operation is completed, the brake mechanism 150 of the boat-shaped welding device of the trolley frame main beam is released, and the control mechanism of the roller frame 100 is started. The roller frame 100 cooperates with the turntable mechanism 200 to drive the trolley frame main beam 500 to rotate 35 degrees clockwise. The trolley frame main beam 500 rotates to a horizontal position, and the locking mechanism 400 is released, and the trolley frame main beam 500 can be moved to the next storage area 610. Fig.11A , Fig. 11B and Fig.12 shown.

[0124] The utility model relates to a boat-shaped welding device for the main beam of a trolley frame, wherein the roller frame 100 can provide a rotational driving force for the boat-shaped welding device for the main beam of the trolley frame. By using the roller frame 100 in coordination, the main beam 500 of the trolley frame can be easily rotated to adapt to different welding angles and positions.

[0125] The turntable mechanism 200 of the utility model is mainly used to limit the main beam 500 of the trolley frame so that it can rotate passively, which not only ensures the position accuracy of the main beam 500 of the trolley frame, but also avoids the risk of collision caused by rotation.

[0126] The roller mechanism 300 in the utility model is mainly used to carry the trolley frame main beam 500 and its accessories to ensure that they are stably in the specified position. At the same time, through the transmission of the roller 320, the relative position between the trolley frame main beam 500 and the trolley frame main beam ship-shaped welding device can be accurately controlled, thereby improving the accuracy and effect of welding.

[0127] The locking mechanism 400 of the utility model ensures that the main beam 500 of the trolley frame always remains stable during the rotation process without displacement or shaking, thereby further improving the safety and reliability of welding.

[0128] In summary, the boat-shaped welding device for the main beam of the trolley frame of the utility model can meet the functional requirements of multi-angle welding displacement of the main beam 500 of the trolley frame during welding, and can better adapt to the welding requirements of the box beam, which not only improves the labor productivity of workers, but also ensures the welding quality of the weld.

[0129] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications fall within the protection scope of the present invention.

Claims

1. A boat-shaped welding device for a trolley frame main beam, characterized in that: The ship-shaped welding device comprises: A roller frame, wherein a roller is provided on the roller frame; A turntable mechanism, the turntable mechanism comprising at least one disk, the outer edge of the disk contacts the outer edge of the roller, and the disk cooperates with the roller to drive the turntable mechanism to rotate; A roller mechanism, which is fixedly connected to the turntable mechanism and rotates together with the turntable mechanism, and the main beam of the trolley frame to be welded is placed on the roller mechanism; A locking mechanism, wherein the locking mechanism is fixed to the roller mechanism, and a locking block is movably connected to the locking mechanism, and the locking blocks are arranged on both sides of the locking mechanism, and the locking blocks fix the main beam of the trolley frame from both sides.

2. The boat-shaped welding device for the main beam of the trolley frame according to claim 1, characterized in that: The roller comprises a driving roller and a driven roller, and the roller frame comprises: Base; An active roller frame, wherein the active roller frame is arranged on the base, and the active roller is mounted on the active roller frame; A control mechanism, the control mechanism is connected to the active roller and is used to control the rotation of the active roller; A driven roller frame is arranged on the base, and the driven roller is installed on the driven roller frame.

3. The boat-shaped welding device for the main beam of the trolley frame according to claim 2, characterized in that: The active roller frame is also provided with a cycloid pinwheel reducer, and the active roller is driven by the cycloid pinwheel reducer to achieve rotation.

4. The boat-shaped welding device for the main beam of the trolley frame according to claim 2, characterized in that: The turntable mechanism comprises a connecting crossbeam and at least two discs, two ends of the connecting crossbeam are respectively connected to the corresponding discs, and the two ends of the connecting crossbeam are located close to the outer edges of the discs.

5. The boat-shaped welding device for the main beam of the trolley frame according to claim 4, characterized in that: The roller frame is also provided with a braking mechanism, which includes a braking base and a braking head. One end of the braking base is fixed to the base, and the braking head is fixedly connected to the other end of the braking base. The disc is also provided with an arc-shaped braking groove for accommodating the braking head.

6. The boat-shaped welding device for the main beam of the trolley frame according to claim 5, characterized in that: The disc is provided with a main beam limiting hole, and the brake groove and the main beam limiting hole are respectively located on both sides of the connecting cross beam.

7. The boat-shaped welding device for the main beam of the trolley frame according to claim 1, characterized in that: The roller mechanism comprises a main frame and a plurality of rollers, and the rollers are rotatably connected in the main frame.

8. The boat-shaped welding device for the main beam of the trolley frame according to claim 7, characterized in that: The locking mechanism comprises: A support rod and a screw rod, both ends of which are fixedly connected to the main frame; At least two slider assemblies, the bottom of each slider assembly is movably connected to the support rod, the screw rod is threadedly connected to the bottom of each slider assembly, and the two slider assemblies are symmetrically arranged; At least two locking blocks, one end of each locking block is movably connected to one of the slider assemblies, and the other end extends toward the middle of the locking mechanism; the two locking blocks are symmetrically arranged, and a clamping space is provided between the two locking blocks.

9. The boat-shaped welding device for the main beam of the trolley frame according to claim 8, characterized in that: Hand wheels are arranged on both sides of the screw rod for controlling the rotation of the screw rod.

10. The boat-shaped welding device for the main beam of a small vehicle frame according to claim 8, characterized in that: A rocker is provided on each locking block to control the locking block to move toward or away from the clamping space.

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