Plate welding tool and use method thereof

Abstract

The invention relates to the technical field of intelligent workshops, and more specifically to a tool for assembling a crane before welding, comprising a rotary platform and an assembling machine; two identical assembling machines are centrally symmetrically distributed on the rotary platform; the assembling machine comprises a flip driving device, a pneumatic clamping and positioning device, and a manually adjustable clamping device; the pneumatic clamping and positioning device is installed at the output end of the flip driving device, and is the flip active end; the manually adjustable clamping device and the pneumatic clamping and positioning device are coaxially arranged, and are the flip driven end; the active end can be used alone or together with the driven end according to the type or size of the workpiece; the tool can realize the pre-welding assembly of various types of cranes, and only one person is required to operate the whole process, with high assembly accuracy and high assembly efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of intelligent workshops, in particular to a tooling and an assembly method for assembling before welding of hanging horses. Background Art

[0002] At present, the pre-welding assembly process of various types of hoisting horses is mostly completed by manual marking and then assembly and splicing. The assembly precision is low and it requires the collaboration of multiple people, which has high labor costs and low assembly efficiency. There are also special tooling for assembly. For example, patent CN110900193A, application number 201911331421.1, applicant: Xuzhou Zhichang Robot System Co., Ltd., discloses "a flexible automatic assembly tool suitable for type A hoisting horses". The technical solution of this patent is: including a frame and a side tightening mechanism installed on the frame, a rear end tightening mechanism, a side plate support lifting mechanism, a center hole positioning mechanism and a workpiece. The side tightening mechanism is symmetrically distributed on the frame on both sides of the rear end tightening mechanism. A side plate support lifting mechanism is correspondingly arranged below each group of side tightening mechanisms. The center hole positioning mechanism is installed in the middle through hole of the workpiece. The center hole positioning mechanism is used for the multi-layer plate of the workpiece to position the hole as the center. The side tightening mechanism and the rear end tightening mechanism perform side positioning on the workpiece, and the accuracy of workpiece assembly is ensured through multiple positioning.

[0003] The technical deficiency involved in this patent is that it is limited to the assembly of type A hanging horses and cannot be applied to the assembly of all types of hanging horses at the same time. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides a tooling and assembly method for assembling a lifting horse before welding, which is used to realize the pre-welding assembly of various types of lifting horses, reduce labor costs, and improve assembly efficiency and assembly accuracy.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A tool for assembling before welding, comprising a rotary platform and two assembling machines symmetrically distributed on the rotary platform; the rotary platform drives the two assembling machines to rotate and switch, and assemble alternately; the assembling machines include a turning drive device, a pneumatic clamping and positioning device, and a manually adjustable clamping device;

[0007] The flip driving device is driven by a servo motor and chain transmission, and is used to realize the necessary flipping of the workpiece during assembly and spot welding; the pneumatic clamping and positioning device and the manually adjustable clamping device are both used for positioning and clamping when the workpiece is assembled; the pneumatic clamping and positioning device is installed at the output end of the flip driving device, and is the flip active end; the manually adjustable clamping device and the pneumatic clamping and positioning device are coaxially arranged, and are the flip driven end; according to the different types or sizes of the workpieces, the active end can be used alone or together with the driven end, which improves the versatility of this tooling;

[0008] The pneumatic clamping and positioning device comprises a flip bracket, a telescopic cylinder, a support seat, a clamping shaft, a swing cylinder seat, a swing cylinder, a rocker arm, a connecting rod, a tongue depressor, a support plate, a straight edge positioning block, a handle 1, an arc edge positioning block and a handle 2;

[0009] The flip bracket is an L-shaped structure, with its vertical end connected to the output end of the flip drive device, a telescopic cylinder is inverted on the lower side of the horizontal end, and a support seat is installed on the upper side; the support seat is cylindrical and coaxial with the piston rod of the telescopic cylinder; the lower end of the clamping shaft is fixedly sleeved on the piston rod of the telescopic cylinder; the clamping shaft is located in the support seat, and the telescopic guidance of the piston rod is achieved through key cooperation between the two; the lower end of the swing cylinder seat is fixedly connected to the upper end of the clamping shaft, and the outer shaft surfaces of the two together form the hole positioning surface of the hoist when assembled; the swing cylinder is installed in the cavity of the swing cylinder seat, the lower end is fixedly connected to the piston rod of the telescopic cylinder, and the upper end is fixed to the rocker arm Fixed connection; a connecting rod is hinged on each side of the rocker arm; a pressing tongue is hinged on each of the two connecting rods; the lower end surfaces of the two pressing tongues are aligned and exceed the upper end surface of the swing cylinder seat; the support plate is installed on the support seat and is used as a horizontal mounting surface when the lifting horse is assembled; the straight edge positioning block and the arc edge positioning block are respectively paired with handle one and handle two and installed on the support plate, which are used for side positioning when the lifting horse is assembled to prevent the workpiece from moving when it is assembled; the telescopic cylinder and the swing cylinder are linked to realize the distance adjustment of the pressing tongue relative to the support plate and the extension and retraction of the pressing tongue, thereby realizing the automatic clamping and release of lifting horse assemblies of various thicknesses.

[0010] Furthermore, the support plate is provided with a strip through hole 1 and a strip through hole 2, and the straight edge positioning block and the arc edge positioning block are installed on the support plate by respectively passing through the strip through hole 1 and the strip through hole 2 via handle 1 and handle 2.

[0011] Further, the manually adjustable clamping device comprises a driven mounting seat, a driven rotating shaft, a driven flip bracket, an extension plate, a screw rod, a nut, an adjusting screw sleeve, a locking nut, a self-locking rod, a self-locking pressure plate and a screw;

[0012] The driven mounting seat is fixedly mounted on the rotating platform; the driven flip bracket is L-shaped, and its vertical end is rotatably connected to the driven mounting seat through a driven rotating shaft, and an extension plate is provided on the upper side of its horizontal end; the screw rod vertically passes through the extension plate and the driven flip bracket, and the lower end is locked with a nut; the adjusting screw sleeve and the locking nut are matched and installed on the screw rod. When assembled, the round hole on the workpiece is inserted into the adjusting screw sleeve, and the adjusting screw sleeve and the locking nut are used in combination to manually adjust the support height of the workpiece to adapt to changes in the thickness of different workpieces and ensure the horizontal placement of the workpiece; the self-locking rod is coaxially mounted on the upper end of the screw rod; the self-locking pressure plate is sleeved on the self-locking rod, and is used in combination with the self-locking rod to manually self-lock, press and release the adjusted workpiece.

[0013] Furthermore, the driven flip bracket and the extension plate are both provided with a strip through hole three, and the installation position of the screw relative to the driven flip bracket and the extension plate can be changed by loosening and tightening the nut, thereby changing the wheelbase between the driven end and the driving end.

[0014] Furthermore, a strip-shaped through hole four is provided on the extension plate, and the installation position of the extension plate relative to the driven flip bracket can be changed by loosening and tightening the screws, thereby further changing the wheelbase between the driven end and the driving end.

[0015] Furthermore, the rotary platform is an automatic rotary platform, which improves the assembly efficiency.

[0016] Furthermore, an isolation fence is provided between the two assembling machines to isolate the assembling personnel from the subsequent welding operation area and protect the safety of the assembling personnel.

[0017] A method for assembling a crane before welding, the process is as follows:

[0018] (1) Open the tooling: control the telescopic cylinder to move the piston rod to the extended state, and control the swing cylinder to move the tongue depressor to the retracted state;

[0019] (2) Clamping and positioning of the lower membrane plate: The lower membrane plate of the lifting horse is placed on the support plate according to the hole positioning by manual or robot, and the handle 1 or handle 2 is manually loosened, and the straight edge positioning block or the arc edge positioning block is adjusted to position the side of the membrane plate and then the handle 1 or handle 2 is locked;

[0020] (3) Clamping and positioning of the panel and the upper diaphragm: The panel and the upper diaphragm of the lifting horse are installed coaxially and orientated on the lower diaphragm manually or by a robot, and the swing cylinder is controlled to make the tongue pressing extend, and the telescopic cylinder is controlled to make the tongue pressing the upper diaphragm of the workpiece; if it is a long workpiece, the driven end needs to be adjusted before installation to make it fit the installation hole distance of the panel and meet the requirements of the panel placement level. When clamping, the self-locking pressure plate needs to be manually put on the self-locking rod, and the end of the self-locking pressure plate is hit with a hammer to press the other end of the panel, so that the workpiece is completely positioned and clamped;

[0021] (4) Spot welding: Use a robot or manual to spot weld the upper membrane plate and the panel together, then start the flip drive device to flip the workpiece 180°, and spot weld the lower membrane plate and the panel together;

[0022] (5) Installation and spot welding of web and bracket: Use robots or manual labor to install web and bracket on the panel according to the design requirements of the drawings, then perform spot welding, and the hoisting assembly is completed;

[0023] (6) Loosen the assembled parts: Start the rotary platform and rotate it 180° to send the assembled parts to the working area of ​​the next process, and control the telescopic cylinder and the swing cylinder to loosen the assembled parts; if it is a long workpiece, use a hammer to hit the end of the self-locking pressure plate at the driven end in the opposite direction before starting the rotary platform, remove the self-locking pressure plate, and loosen the other end of the panel;

[0024] (7) Unloading: The assembled parts are taken down by the handling robot and enter the next process. At the same time, the assembly of the next hanging workpiece is continued on another assembly machine, and the above process is repeated in sequence.

[0025] Compared with the prior art, the present invention has the following significant advantages:

[0026] 1. The tooling and method for assembling the pairing of the lifting horse before welding of the present invention can select the active end to be used alone or together with the driven end according to the different types or sizes of the workpieces, so as to adapt to the assembly of the lifting horse workpieces of different types or sizes, so that the tooling has universality;

[0027] 2. The tooling and assembly method for pre-welding of the present invention can accurately position the assembled workpieces through a pneumatic clamping and positioning device and a manually adjustable clamping device, thereby improving the assembly accuracy;

[0028] 3. The rotary platform of the present invention can realize the alternating assembly of two assembling machines. One assembling machine unloads materials for welding while the other assembling machine loads materials for assembly, thereby improving the assembly and subsequent welding efficiency of the crane.

[0029] 4. The tooling and assembly method for assembling the hoisting horse before welding of the present invention only require one person to operate the whole process, thus reducing the labor cost;

[0030] 5. The present invention provides a tooling and assembly method for assembling before hoisting welding. An isolation fence is provided between two assembling machines to isolate the assembling personnel from the subsequent welding operation area, thereby protecting the safety of the assembling personnel.

[0031] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0033] Figure 2It is a schematic diagram of clamping a short workpiece 4 according to the present invention.

[0034] Figure 3 It is a schematic diagram of clamping a long workpiece 5 according to the present invention.

[0035] Figure 4 It is a front view of the pneumatic clamping and positioning device 22 of the present invention.

[0036] Figure 5 It is a top view of the pneumatic clamping and positioning device 22 of the present invention.

[0037] Figure 6 It is a front view of the manual adjustment device 23 of the present invention.

[0038] Figure 7 It is a top view of the manual adjustment device 23 of the present invention.

[0039] In the figure:

[0040] 1. Rotating platform, 2. Assembly machine, 3. Isolation fence, 4. Short workpiece, 5. Long workpiece;

[0041] 21. Flip driving device, 22. Pneumatic clamping and positioning device, 23. Manual adjustment device;

[0042] 201, flip bracket, 202, telescopic cylinder, 203, support seat, 204, clamping shaft, 205, swing cylinder seat, 206, swing cylinder, 207, rocker arm, 208, connecting rod, 209, tongue depressor, 210, support plate, 211, straight edge positioning block, 212, handle one, 213, arc edge positioning block, 214, handle two;

[0043] 2101. Strip through hole one, 2102. Strip through hole two;

[0044] 301, driven mounting seat, 302, driven rotating shaft, 303, driven flip bracket, 304, extension plate, 305, screw rod, 306, adjusting screw sleeve, 307, locking nut, 308 self-locking rod, 309 self-locking pressure plate, 310 nut, 311 screw;

[0045] 3041, strip through hole three, 3042, strip through hole four. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not necessarily indicate quantity restrictions. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include typical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0047] Embodiment 1

[0048] like Figure 1 , Figure 2 and Figure 3 As shown, a pre-assembly tooling for welding with a crane designed by the present invention comprises a rotary platform 1 and two assembly machines 2 centrally and symmetrically distributed on the rotary platform 1; the rotary platform 1 drives the two assembly machines 2 to rotate and switch and assemble alternately; the assembly machine 2 comprises a flip driving device 21, a pneumatic clamping and positioning device 22 and a manually adjustable clamping device 23;

[0049] The flipping drive device 21 is driven by a servo motor and chain transmission, and is used to realize the necessary flipping of the workpiece during assembly and spot welding; the pneumatic clamping and positioning device 22 and the manually adjustable clamping device 23 are both used for positioning and clamping when the workpiece is assembled; the pneumatic clamping and positioning device 22 is installed at the output end of the flipping drive device 21, and is the flipping active end; the manually adjustable clamping device 23 and the pneumatic clamping and positioning device 22 are coaxially arranged, and are the flipping driven end; according to the type or size of the workpiece, the active end can be used alone or together with the driven end, which improves the versatility of this tooling: for short workpieces 4, such as A, B, and C type hoists, the assembly process can be realized with only the active end; and for long workpieces 5, such as D and E type hoists, the active end and the driven end need to be used simultaneously when assembling.

[0050] Furthermore, if Figure 4As shown, the pneumatic clamping and positioning device 22 includes a flip bracket 201, a telescopic cylinder 202, a support seat 203, a clamping shaft 204, a swing cylinder seat 205, a swing cylinder 206, a rocker arm 207, a connecting rod 208, a tongue pressing 209, a support plate 210, a straight edge positioning block 211, a handle 1 212, an arc edge positioning block 213 and a handle 2 214;

[0051] The flip bracket 201 is an L-shaped structure, with its vertical end connected to the output end of the flip drive device 21, and a telescopic cylinder 202 is inverted on the lower side of the horizontal end, and a support seat 203 is installed on the upper side; the support seat 203 is cylindrical and coaxial with the piston rod of the telescopic cylinder 202; the lower end of the clamping shaft 204 is fixedly sleeved on the piston rod of the telescopic cylinder 202; the clamping shaft 204 is located in the support seat 203, and the telescopic guidance of the piston rod is realized by key cooperation between the two; the lower end of the swing cylinder seat 205 is fixedly connected to the upper end of the clamping shaft 204, and the outer shaft surfaces of the two together form the hole positioning surface of the hoist when assembled; the swing cylinder 206 is installed in the cavity of the swing cylinder seat 205, the lower end is fixedly connected to the piston rod of the telescopic cylinder 202, and the upper end is fixedly connected to the rocker arm 207; A connecting rod 208 is hinged on each side of the rocker arm 207; a pressing tongue 209 is hinged on each of the two connecting rods 208; the lower end surfaces of the two pressing tongues 209 are aligned and exceed the upper end surface of the swing cylinder seat 205; the support plate 210 is installed on the support seat 203 and is used as a horizontal mounting surface when the hoisting horse is assembled; the straight edge positioning block 211 and the arc edge positioning block 213 are respectively paired with handle 1 212 and handle 2 214 and are installed on the support plate 210 for side positioning when the hoisting horse is assembled to prevent the workpiece from moving when it is assembled; the telescopic cylinder 202 and the swing cylinder 206 are linked to realize the distance adjustment of the pressing tongue 209 relative to the support plate 210 and the extension and retraction of the pressing tongue 209, thereby realizing the automatic clamping and release of hoisting horse assemblies of various thicknesses.

[0052] Furthermore, if Figure 5 As shown, the support plate 210 is provided with a strip through hole 1 2101 and a strip through hole 2102, and the straight edge positioning block 211 and the arc edge positioning block 213 are installed on the support plate 210 through the handle 1 212 and the handle 2 214 passing through the strip through hole 1 2101 and the strip through hole 2 2102 respectively.

[0053] Furthermore, if Figure 6 As shown, the manually adjustable clamping device 23 includes a driven mounting seat 301, a driven rotating shaft 302, a driven flip bracket 303, an extension plate 304, a screw 305, a nut 306, an adjusting screw sleeve 307, a locking nut 308, a self-locking rod 309, a self-locking pressure plate 310 and a screw 311;

[0054] The driven mounting seat 301 is fixedly mounted on the rotary platform 1; the driven flip bracket 303 is L-shaped, and its vertical end is rotatably connected to the driven mounting seat 301 through a driven rotating shaft 302, and an extension plate 304 is provided on the upper side of its horizontal end; the screw rod 305 vertically passes through the extension plate 304 and the driven flip bracket 303, and the lower end is locked with a nut 306; the adjusting screw sleeve 307 and the locking nut 308 are matched and installed on the screw rod 305. When assembled, the round hole on the workpiece is inserted into the adjusting screw sleeve 307, and the adjusting screw sleeve 307 and the locking nut 308 are used in combination to manually adjust the workpiece support height to adapt to the changes in the thickness of different workpieces and ensure the horizontal placement of the workpiece; the self-locking rod 309 is coaxially mounted on the upper end of the screw rod 305; the self-locking pressure plate 310 is sleeved on the self-locking rod 309, and is used in combination with the self-locking rod 309 to manually self-lock and release the adjusted workpiece.

[0055] Furthermore, if Figure 7 As shown, the driven flip bracket and the extension plate 304 are both provided with a strip through hole 3041, and the installation position of the screw 305 relative to the driven flip bracket 303 and the extension plate 304 can be changed by loosening and tightening the nut 306, thereby changing the wheelbase between the driven end and the driving end.

[0056] Furthermore, if Figure 7 As shown, the extension plate 304 is provided with a strip through hole 3042, and the installation position of the extension plate 304 relative to the driven flip bracket 303 can be changed by loosening and tightening the screw 311, thereby further changing the wheelbase between the driven end and the driving end.

[0057] Furthermore, the rotary platform 1 is an automatic rotary platform, which improves the assembly efficiency.

[0058] Furthermore, if Figure 1 As shown, an isolation fence 3 is provided between the two assembling machines to isolate the assembling personnel from the subsequent welding operation area and protect the safety of the assembling personnel.

[0059] A method for assembling a crane before welding, the process is as follows:

[0060] (1) Opening the tooling: controlling the telescopic cylinder 202 to move the piston rod to an extended state, and controlling the swing cylinder 206 to move the tongue pressing 209 to a retracted state;

[0061] (2) Clamping and positioning of the lower membrane plate: The lower membrane plate of the hanging horse is placed on the support plate 210 according to the hole positioning by manual or robot, and the handle 1 212 or the handle 2 214 is manually loosened, and the straight edge positioning block 211 or the arc edge positioning block 213 is adjusted to position the side of the membrane plate and then the handle 1 212 or the handle 2 214 is locked;

[0062] (3) Clamping and positioning of the panel and the upper diaphragm: The panel and the upper diaphragm of the hanging horse are coaxially and directionally installed on the lower diaphragm manually or by a robot, and the swing cylinder 206 is controlled to move so that the pressing tongue 209 is in an extended state, and the telescopic cylinder 202 is controlled to move so that the pressing tongue 209 presses the upper diaphragm of the workpiece; if it is a long workpiece 5, before installation, it is also necessary to adjust the driven end to make it suitable for the installation hole spacing of the panel and meet the requirements of the panel being placed horizontally. When clamping, it is also necessary to manually cover the self-locking pressure plate 310 on the self-locking rod 309, and use a hammer to hit the end of the self-locking pressure plate 310 to press the other end of the panel, so that the workpiece is completely positioned and clamped;

[0063] (4) Spot welding: The upper membrane plate and the face plate are spot welded together by a robot or manually, and then the flip drive device 21 is started to flip the workpiece 180°, and the lower membrane plate and the face plate are spot welded together;

[0064] (5) Installation and spot welding of web and bracket: Use robots or manual labor to install web and bracket on the panel according to the design requirements of the drawings, then perform spot welding, and the hoisting assembly is completed;

[0065] (6) Loosening the assembled parts: Start the rotary platform 1 and rotate it 180° to send the assembled parts to the working area of ​​the next process, and control the telescopic cylinder 202 and the swing cylinder 206 to loosen the assembled parts; if it is a long workpiece 5, before starting the rotary platform 1, it is necessary to use a hammer to hit the end of the self-locking pressure plate 310 at the driven end in the opposite direction, remove the self-locking pressure plate 310, and loosen the other end of the panel;

[0066] (7) Unloading: The assembled parts are taken down by the handling robot and enter the next process. At the same time, the assembly of the next hanging workpiece is continued on another assembly machine, and the above process is repeated in sequence.

[0067] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various improvements and changes, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A plate welding tool, characterized in that: Used for assembly before hoisting welding, the plate welding tooling includes a rotary platform and two assembly machines symmetrically distributed on the rotary platform. The rotary platform drives the two assembly machines to rotate and switch and assemble alternately. The assembly machine includes a flip driving device, a pneumatic clamping and positioning device, and a manually adjustable clamping device; The flip driving device is driven by a servo motor and a chain transmission, and is used to realize the necessary flipping of the workpiece during the assembly and spot welding process; the pneumatic clamping and positioning device and the manually adjustable clamping device are both used for positioning and clamping when the workpiece is assembled; the pneumatic clamping and positioning device is installed at the output end of the flip driving device, and is the flip active end; the manually adjustable clamping device and the pneumatic clamping and positioning device are coaxially arranged, and are the flip driven end; according to the type or size of the workpiece, the active end can be used alone or together with the driven end; The pneumatic clamping and positioning device comprises a flip bracket, a telescopic cylinder, a support seat, a clamping shaft, a swing cylinder seat, a swing cylinder, a rocker arm, a connecting rod, a tongue depressor, a support plate, a straight edge positioning block, a handle 1, an arc edge positioning block and a handle 2; The flip bracket is an L-shaped structure, with its vertical end connected to the output end of the flip drive device, a telescopic cylinder is inverted on the lower side of the horizontal end, and a support seat is installed on the upper side; the support seat is cylindrical and coaxial with the piston rod of the telescopic cylinder; the lower end of the clamping shaft is fixedly sleeved on the piston rod of the telescopic cylinder; the clamping shaft is located in the support seat, and the telescopic guidance of the piston rod is achieved through key cooperation between the two; the lower end of the swing cylinder seat is fixedly connected to the upper end of the clamping shaft, and the outer shaft surfaces of the two together form the hole positioning surface of the hoist when assembled; the swing cylinder is installed in the cavity of the swing cylinder seat, and the lower end is connected to the The piston rod of the telescopic cylinder is fixedly connected, and the upper end is fixedly connected to the rocker arm; a connecting rod is hinged on each side of the rocker arm; a tongue is hinged on each of the two connecting rods; the lower end surfaces of the two tongues are aligned and exceed the upper end surface of the swing cylinder seat; the support plate is installed on the support seat and is used as a horizontal mounting surface when the lifting horse is assembled; the straight edge positioning block and the arc edge positioning block are respectively matched with the handle one and the handle two and are installed on the support plate for side positioning when the lifting horse is assembled; the telescopic cylinder and the swing cylinder are linked to realize the distance adjustment of the tongue relative to the support plate and the extension and retraction of the tongue; The manually adjustable clamping device comprises a driven flip bracket, an extension plate, a screw, a nut, an adjusting screw sleeve, a locking nut and a screw; an extension plate is provided on the upper side of the horizontal end of the driven flip bracket; The screw rod vertically passes through the extension plate and the driven flip bracket, and the lower end is locked with a nut; the adjusting screw sleeve and the locking nut are matched and installed on the screw rod. When assembled, the round hole on the workpiece is inserted into the adjusting screw sleeve, and the adjusting screw sleeve and the locking nut are used together to manually adjust the support height of the workpiece.

2. The plate welding tool according to claim 1, characterized in that: The support plate is provided with a strip through hole 1 and a strip through hole 2, and the straight edge positioning block and the arc edge positioning block are installed on the support plate by respectively passing through the strip through hole 1 and the strip through hole 2 through the handle 1 and the handle 2.

3. The plate welding tool according to claim 1, characterized in that: The manually adjustable clamping device also includes a driven mounting seat, a driven rotating shaft, a self-locking pressure plate and a self-locking rod. The driven mounting seat is fixedly mounted on the rotating platform, the self-locking rod is coaxially mounted on the upper end of the screw rod, and the driven flip bracket is L-shaped, and its vertical end is rotatably connected to the driven mounting seat through the driven rotating shaft; the self-locking pressure plate is sleeved on the self-locking rod and is used in conjunction with the self-locking rod to manually self-lock and release the adjusted workpiece.

4. The plate welding tool according to claim 3, characterized in that: The driven flip bracket and the extension plate are both provided with a strip through hole three, and the installation position of the screw relative to the driven flip bracket and the extension plate can be changed by loosening and tightening the nut, thereby changing the wheelbase between the driven end and the driving end.

5. The plate welding tool according to claim 4, characterized in that: The extension plate is provided with a strip through hole four, and the installation position of the extension plate relative to the driven flip bracket can be changed by loosening and tightening the screws, thereby further changing the wheelbase between the driven end and the driving end.

6. The plate welding tool according to claim 1, characterized in that: The rotating platform is an automatic rotating platform.

7. The plate welding tool according to claim 1, characterized in that: An isolation fence is provided between the two assembling machines to separate the assembling personnel from the subsequent welding operation area.

8. A method for assembling a crane before welding, characterized in that: The method uses the plate welding tool described in claim 5, and the process is as follows: (1) Open the tooling: control the telescopic cylinder to extend the piston rod, and control the swing cylinder to retract the tongue depressor; (2) Clamping and positioning of the lower diaphragm plate: The lower diaphragm plate of the lifting horse is placed on the support plate according to the hole positioning by manual or robot, and handle 1 or handle 2 is manually loosened, and the straight edge positioning block or arc edge positioning block is adjusted to position the side of the diaphragm plate and then handle 1 or handle 2 is locked; (3) Clamping and positioning of the panel and upper diaphragm: The panel and upper diaphragm of the hoist are installed coaxially and orientably on the lower diaphragm manually or by a robot. The swing cylinder is controlled to make the tongue press out, and the telescopic cylinder is controlled to make the tongue press the upper diaphragm of the workpiece. If the workpiece is long, the driven end needs to be adjusted before installation to make it fit the installation hole distance of the panel and meet the requirements of the panel placement level. When clamping, the self-locking pressure plate needs to be manually put on the self-locking rod, and the end of the self-locking pressure plate is hit with a hammer to press the other end of the panel, so that the workpiece is completely positioned and clamped. (4) Spot welding: Use a robot or manual labor to spot weld the upper membrane plate and the panel together, then start the flip drive device to flip the workpiece 180°, and spot weld the lower membrane plate and the panel together; (5) Installation and spot welding of web and bracket: Use robots or manual labor to install the web and bracket on the panel according to the design requirements of the drawings, and then perform spot welding. The hoisting horse assembly is completed; (6) Loosen the assembled parts: Start the rotary platform and rotate it 180° to send the assembled parts to the working area of ​​the next process, and control the telescopic cylinder and the swing cylinder to loosen the assembled parts; if it is a long workpiece, use a hammer to hit the end of the self-locking pressure plate at the driven end in the opposite direction before starting the rotary platform, remove the self-locking pressure plate, and loosen the other end of the panel; (7) Unloading: The assembled parts are taken down by the handling robot and enter the next process. At the same time, the assembly of the next hanging workpiece is continued on another assembly machine, and the above process is repeated in sequence.

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