CN213438034U

CN213438034U - Welding tool for automobile middle lower well frame

Info

Publication number: CN213438034U
Application number: CN202022306720.4U
Authority: CN
Inventors: 马凯; 李庆; 李浩南; 周成功; 王科翔
Original assignee: Anhui Technical College of Mechanical and Electrical Engineering
Current assignee: Anhui Technical College of Mechanical and Electrical Engineering
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-06-15
Anticipated expiration: 2030-10-14

Abstract

The utility model relates to the field of automobile parts, in particular to a welding tool for a well descending frame in an automobile, which comprises a welding table, a clamping mechanism and a turnover mechanism, wherein the clamping mechanism comprises a first clamping mechanism for clamping a first supporting rod, a second clamping mechanism for clamping a second supporting rod and two third clamping mechanisms for clamping an inclined supporting rod, the turnover mechanism is arranged on the first clamping mechanism, each third clamping mechanism consists of a rotary pressing mechanism and a third pressing plate, the third pressing plate is fixedly arranged at the output end of the rotary pressing mechanism, and an interval adjusting mechanism is arranged on the third pressing plate, the welding tool has simple structure and convenient operation, the well head frame can not be deviated in the fixed position during the welding of the centering lower well head frame, so that the high efficiency and the high workload are achieved, and the welding of the well head frame connecting part in the automobile part is facilitated.

Description

Welding tool for automobile middle lower well frame

Technical Field

The utility model relates to an automobile parts field, concretely relates to welding frock that is arranged in car to descend well frame.

Background

The automobile modification means that the original automobile produced by an automobile manufacturer is subjected to external modeling, internal modeling and mechanical property modification according to the requirements of an automobile owner, and mainly comprises automobile body modification and power modification. The refitting of the automobile body comprises a suspension system, a brake system, an automobile body reinforcing member and the like, wherein in the automobile body reinforcing member, the automobile body reinforcing member is divided into a top bar (commonly called a balance bar), a rear stabilizing bar, a middle well frame and the like for reinforcing a chassis, the middle well frame and the lower well frame need to be welded most in the production process, the matching of all parts cannot deviate in the welding process, the precision requirement is higher, the high strength after welding is guaranteed, and therefore a welding tool for the middle well frame and the lower well frame of the automobile needs to be designed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a welding frock for well frame in car to in the convenience well frame assembles the welding fast, thereby improves the welding efficiency of well frame in the welding.

To achieve the purpose, the utility model adopts the following technical proposal: the utility model provides a welding frock for well frame in car, including the welding bench with set up fixture and tilting mechanism on the welding bench, fixture is including the first clamping mechanism who is used for pressing from both sides tight first bracing piece, the second clamping mechanism who is used for pressing from both sides tight second bracing piece and two third clamping mechanisms who are used for pressing from both sides tight diagonal bracing piece, tilting mechanism sets up on first clamping mechanism, every third clamping mechanism comprises rotatory pushing down mechanism and third clamp plate, the fixed output that sets up in rotatory pushing down mechanism of third clamp plate, be equipped with interval guiding mechanism on the third clamp plate.

As an optimal scheme for a welding frock of lower well frame in car, first clamping mechanism includes that first supporting seat and two sets of symmetries set up the mechanism that pushes down on first supporting seat, every group pushes down the mechanism and all includes the carrier, first cylinder and first clamp plate, the cross sectional shape of first supporting seat is the L type and the level sets up the top at the welding bench, the carrier is by the roof, bottom plate and riser are constituteed, the riser setting is between bottom plate and roof and its upper and lower extreme respectively with the two fixed connection, the carrier is fixed to be set up in the reentrant corner side of first supporting seat, first clamp plate is under the roof, first cylinder is vertical state fixed the setting in the top of roof, the output of first cylinder passes the roof downwards and with first clamp plate fixed connection.

As an optimal scheme for a welding frock of well frame in car, tilting mechanism includes manual stick up pole and two hinges, and two hinges are the fixed top that sets up at first supporting seat of symmetrical state, and the free end of every hinge all is connected with the roof that corresponds, and manual stick up the pole and constitute by two connecting plates and a pull rod, on the lower extreme of two connecting plates respectively fixed mounting two roofs, the pull rod setting is between two connecting plates and the fixed connection two.

As an optimal scheme for a welding frock for a well frame in an automobile, a second clamping mechanism comprises a second supporting seat, two second cylinders and four positioning pins, the shape of the second supporting seat is matched with that of a second supporting rod, a containing groove for containing the second supporting rod is formed in the second supporting seat, the two second cylinders are symmetrically arranged at two ends of one side of the second supporting seat, which is far away from the first supporting rod, four positioning pins which are matched with the positioning holes in the second supporting rod are arranged at the bottom of the inner side of the second supporting seat, the upper half part of each positioning pin is of a conical structure, and the output end of each second cylinder is arranged in a push plate for clamping the inclined rod.

As an optimal scheme for a welding frock of well frame in car, third clamping mechanism still includes the third supporting seat, rotatory pushing mechanism includes revolving cylinder, third cylinder and roof support, the transversal U type that personally submits of third supporting seat, revolving cylinder is fixed to be set up at the top of welding bench and is located one side of third supporting seat, the third cylinder is the fixed top output that sets up at revolving cylinder of vertical state, the output of third cylinder is vertical upwards to extend, the output fixed connection of roof support and third cylinder, the free end and the interval guiding mechanism of roof support are connected.

The interval guiding mechanism comprises a hand-operated bidirectional threaded rod, a bearing seat and two clamping plates, limit grooves for avoiding the two clamping plates are formed in two long-edge sides of a third pressing plate, the bearing seat is fixedly arranged at the top center of the third pressing plate and corresponds to the long-edge direction of the first pressing plate in the axial direction, the middle of the hand-operated bidirectional threaded rod is fixedly arranged in the bearing seat, the axial direction of the hand-operated bidirectional threaded rod is the same as the axial direction of the bearing seat, the clamping plates are vertically arranged on two sides of the bottom of the third pressing plate, the upper end of each clamping plate is provided with a threaded seat matched with the hand-operated bidirectional threaded rod, a limit strip is arranged below the threaded seat, the limit strip is attached to the bottom of the third pressing plate, and the outer end of each limit groove is fixedly provided with a.

As an optimal scheme of a welding tool for a well frame in an automobile, a rectangular through hole for avoiding a push plate is formed in the side wall of the second supporting seat, and a transverse plate for longitudinally pressing an inclined rod is fixedly arranged on one side, away from the second cylinder, of the push plate.

As an optimal scheme of a welding tool for a well frame in an automobile, rectangular grooves for avoiding carriers are symmetrically formed in the bottom of the inner side of a first supporting seat, and sinking grooves for placing first supporting rods are formed in a bottom plate.

Well lower well frame is by first bracing piece, second bracing piece and two bearing diagonal pole are constituteed, two bearing diagonal pole are the symmetry and set up between first bracing piece and second bracing piece, the both ends of every bearing diagonal pole are equallyd divide and do not are connected with first bracing piece and second bracing piece, the second bracing piece comprises a straight-bar and two down tube, the straight-bar is parallel with first bracing piece, two down tube are the symmetry and set up in the both ends of straight-bar, and two down tube are located one side that the straight-bar kept away from first bracing piece, the both ends of every down tube all are equipped with the locating hole.

The utility model has the advantages that: when the welding tool is used, the first supporting rod of the middle and lower headframes is placed below the first clamping mechanism and tightly presses the first supporting rod, the second supporting rod is placed below the second clamping mechanism and tightly presses the second supporting rod, the two inclined supporting rods are respectively placed below the third clamping mechanism, the third pressing plate rotates to the upper part of the inclined supporting rod through the rotating pressing mechanism, the rotating pressing mechanism continuously drives the third pressing plate to press and tightly press the two inclined supporting rods, the interval adjusting mechanism arranged on the third pressing plate is used for adjusting the widths of the inclined supporting rods in different batches, the inclined supporting rods are better clamped, when the joint of the two ends of the two inclined supporting rods and the first supporting rod and the second supporting rod is welded, the joint of the middle and lower headframes which are turned over through the turnover mechanism and continuously welded is finished, the welding tool has simple structure and convenient operation, the position of the middle and lower headframes cannot deviate during welding, therefore, the high-efficiency and high-workload welding machine is convenient for welding the junction of the middle and lower well frames of the automobile parts.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic view of the structure of the well frame of the present invention.

Fig. 2 is a schematic perspective view of the present invention.

Fig. 3 is a perspective view of the third clamping mechanism.

Fig. 4 is a schematic perspective view of the spacing adjustment mechanism.

Fig. 5 is a perspective view of the first clamping mechanism and the turnover mechanism.

Fig. 6 is a schematic perspective view of the second support seat.

In the figure:

1. a first support bar; 2. a second support bar; 3. an inclined support rod; 4. a straight rod; 5. a diagonal bar; 6. positioning holes; 7. a welding table; 8. a turnover mechanism; 9. a first clamping mechanism; 10. a second clamping mechanism; 11. a third clamping mechanism; 12. rotating the pressing mechanism; 13. a third press plate; 14. a spacing adjustment mechanism; 15. a first support base; 16. a pressing mechanism; 17. a carrier; 18. a first cylinder; 19. a first platen; 20. a top plate; 21. a base plate; 22. pushing the plate; 23. a vertical plate; 24. a manual lever is tilted; 25. a hinge; 26. a connecting plate; 27. a pull rod; 28. a second support seat; 29. a second cylinder; 30. positioning pins; 31. a third support seat; 32. a rotating cylinder; 33. a third cylinder; 34. supporting a top plate; 35. a hand-operated bidirectional threaded rod; 36. a bearing seat; 37. a splint; 38. a limiting groove; 39. a threaded seat; 40. a limiting strip; 41. a baffle plate; 42. a rectangular channel; 43. a transverse plate; 44. a rectangular groove; 45. and (5) sinking the tank.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are used only for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms will be understood by those skilled in the art according to the specific circumstances.

In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between the components, is to be understood broadly, for example, as being either a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 well frame down in by first bracing piece 1, second bracing piece 2 and two bracing piece 3 are constituteed, two bracing piece 3 are the symmetry and set up between first bracing piece 1 and second bracing piece 2, the both ends of every bracing piece 3 are equallyd divide and are do not connected with first bracing piece 1 and second bracing piece 2, second bracing piece 2 comprises a straight-bar 4 and two bracing pieces 5, straight-bar 4 is parallel with first bracing piece 1, two bracing pieces 5 are the symmetry and set up in the both ends of straight-bar 4, and two bracing pieces 5 are located one side that first bracing piece 1 was kept away from to straight-bar 4, the both ends of every bracing piece 5 all are equipped with locating hole 6.

Referring to fig. 2 to 6, the welding tool for the automobile middle well descending frame comprises a welding table 7, and a clamping mechanism and a turnover mechanism 8 which are arranged on the welding table 7, wherein the clamping mechanism comprises a first clamping mechanism 9 for clamping a first supporting rod 1, a second clamping mechanism 10 for clamping a second supporting rod 2, and two third clamping mechanisms 11 for clamping an inclined supporting rod 3, the turnover mechanism 8 is arranged on the first clamping mechanism 9, each third clamping mechanism 11 is composed of a rotary pressing mechanism 12 and a third pressing plate 13, the third pressing plate 13 is fixedly arranged at the output end of the rotary pressing mechanism 12, and a distance adjusting mechanism is arranged on the third pressing plate 13. When the device is used, the first supporting rod 1 of the middle and lower derrick is placed below the first clamping mechanism 9 and tightly presses the first supporting rod 1, the second supporting rod 2 is placed below the second clamping mechanism 10 and tightly presses the second supporting rod 2, the two inclined supporting rods 3 are respectively placed below a third clamping mechanism, the third pressing plate 13 rotates to the upper side of the inclined supporting rods 3 through the rotating pressing mechanism 12, the rotating pressing mechanism 12 continuously drives the third pressing plate 13 to press and tightly clamp the two inclined supporting rods 3, the distance adjusting mechanism arranged on the third pressing plate 13 is used for adjusting the widths of the inclined supporting rods 3 in different batches, the inclined supporting rods 3 are better clamped, and when the joints of the two ends of the two inclined supporting rods 3 and the first supporting rod 1 and the second supporting rod 2 are welded, the joints of the reverse side of the middle and lower derrick are turned through the turning mechanism 8 and continuously welded.

First clamping mechanism 9 includes first supporting seat 15 and two sets of symmetries set up the mechanism 16 that pushes down on first supporting seat 15, every group pushes down the mechanism 16 and all includes carrier 17, first cylinder 18 and first clamp plate 19, the cross sectional shape of first supporting seat 15 is the L type and the level sets up the top at welding bench 7, carrier 17 comprises roof 20, bottom plate 21 and riser 23, riser 23 sets up between bottom plate 21 and roof 20 and its upper and lower extreme respectively with the two fixed connection, carrier 17 is fixed to be set up in the reentrant corner side of first supporting seat 15, first clamp plate 19 is under roof 20, first cylinder 18 is vertical state fixed the setting in the top of roof 20, the output of first cylinder 18 passes roof 20 downwards and with first clamp plate 19 fixed connection. The first supporting rod 1 is horizontally placed on the carrier 17, and the first clamping mechanism 9 pushes the first pressing plate 19 to clamp the first supporting rod 1 placed on the carrier 17 downwards through the first air cylinder 18, so that the first supporting rod is ensured not to be subjected to position deviation in the welding process.

Tilting mechanism 8 includes manual stick of stick 24 and two hinges 25, and two hinges 25 are the fixed top that sets up at first supporting seat 15 of symmetrical state, and the free end of every hinge 25 all is connected with the roof 20 that corresponds, and manual stick of stick 24 comprises two connecting plates 26 and a pull rod 27, and on two roof 20 of lower extreme difference fixed mounting of two connecting plates 26, pull rod 27 set up between two connecting plates 26 and the fixed connection two. After the joint of the first support rod 1 and the second support rod 2 is welded, the middle and lower # -shaped frames on the carrier 17 are driven to tilt by the manual tilting rod 24, then the # -shaped frames are turned over, and the joint of the middle and lower # -shaped frames is continuously welded.

The second clamping mechanism 10 includes a second supporting seat 28, two second cylinders 29 and two push plates 22 and four positioning pins 30, the shape of the second supporting seat 28 matches with the second supporting rod 2, an accommodating groove for accommodating the second supporting rod 2 is provided on the second supporting seat 28, two second cylinders 29 are symmetrically arranged at two ends of one side of the second supporting seat 28 away from the first supporting rod 1, the inner bottom of the second supporting seat 28 is provided with four positioning pins 30 which are matched with the positioning holes 6 on the second supporting rod 2, the upper half of each positioning pin 30 is of a conical structure, and the output end of each second cylinder 29 is arranged on one push plate 22 which is used for clamping the inclined rod 5. The second support rod 2 is placed on four positioning pins 30 matched with the second support seat 28 through four positioning holes 6, so that the second support rod 2 cannot deviate during welding, and the clamping force of the two push plates 22 arranged on one side of the second support seat 28 on the second support rod 2 is greatly increased.

Third clamping mechanism 11 still includes third supporting seat 31, rotatory hold-down mechanism 12 includes revolving cylinder 32, third cylinder 33 and support roof 34, the transversal U type that personally submits of third supporting seat 31, revolving cylinder 32 is fixed to be set up at the top of welding bench 7 and is located one side of third supporting seat 31, third cylinder 33 is the fixed top output that sets up at revolving cylinder 32 of vertical state, the vertical upwards extension of output of third cylinder 33, support roof 34 and the output fixed connection of third cylinder 33, the free end and the interval guiding mechanism of support roof 34 are connected. Two inclined support rods 3 are placed in a third support seat 31, two ends of each inclined support rod are intersected with a first support rod 1 and a second support rod 2, a rotary cylinder 32 drives a third cylinder 33 installed on the output end of the rotary cylinder to rotate, the third cylinder 33 drives a support top plate 34 installed on the output end of the rotary cylinder to move up and down, the support top plate 34 drives an interval adjusting mechanism installed on the support top plate to move up and down, and when the underground character frame is turned over, a rotary pressing mechanism 12 rises and rotates to drive the interval adjusting mechanism to leave the upper portion of the third support seat 31, so that the inclined support rod is convenient to turn over.

Spacing adjustment mechanism includes hand formula two-way threaded rod 35, bearing frame 36 and two splint 37, the spacing groove 38 of dodging two splint 37 is seted up to the long limit both sides of third clamp plate 13, the fixed long limit direction that sets up in the top center department of third clamp plate 13 and axial correspondence first clamp plate 19 of bearing frame 36, the fixed setting in bearing frame 36 in middle part of hand formula two-way threaded rod 35, the axial of hand formula two-way threaded rod 35 is the same with the axial of bearing frame 36, the vertical setting in the bottom both sides of third clamp plate 13 of splint 37, the upper end of every splint 37 all is provided with the screw thread seat 39 of the hand formula two-way threaded rod 35 of cooperation, the below of screw thread seat 39 is provided with spacing 40, spacing 40 and the bottom laminating of third clamp plate 13, the outer end of every spacing groove 38 is all fixed and is provided with. The spacing adjusting mechanism rotates the hand-operated bidirectional threaded rod 35 to enable the two clamping plates 37 to approach to each other until the clamping blocks clamp the inclined supporting rod 3.

A rectangular through hole for avoiding the push plate 22 is formed in the side wall of the second support seat 28, and a transverse plate 43 for longitudinally pressing the inclined rod 5 is fixedly arranged on one side of the push plate 22 away from the second cylinder 29. When the push plate 22 compresses the second support rod 2, the second transverse plate 43 arranged on the push plate 22 compresses the second support rod 2 downwards, so that the second support rod 2 is completely fixed and cannot deviate in the welding process.

Rectangular grooves 44 for avoiding the carrier 17 are symmetrically arranged at the bottom of the inner side of the first supporting seat 15, and a sinking groove 45 for placing the first supporting rod 1 is formed in the bottom plate 21. The first supporting rod 1 is placed on the sinking groove 45 of the bottom plate 21, the height of the sinking groove 45 is the same as that of the bottom of the first supporting seat 15, and the first supporting rod 1 is stably placed on the first supporting seat 15.

It should be understood that the above-described embodiments are merely illustrative of the preferred embodiments of the present invention and the technical principles thereof. It will be understood by those skilled in the art that various modifications, equivalents, changes, and the like can be made to the present invention. However, these modifications are within the scope of the present invention as long as they do not depart from the spirit of the present invention. In addition, certain terms used in the specification and claims of the present application are not limiting, but are used merely for convenience of description.

Claims

1. The utility model provides a welding frock for well frame in car, a serial communication port, including welding bench (7) with set up fixture and tilting mechanism (8) on welding bench (7), fixture is including first clamping mechanism (9) that are used for pressing from both sides tight first bracing piece (1), second clamping mechanism (10) that are used for pressing from both sides tight second bracing piece (2) and two third clamping mechanism (11) that are used for pressing from both sides tight bracing piece (3), tilting mechanism (8) set up on first clamping mechanism (9), every third clamping mechanism (11) are by rotatory mechanism (12) and third clamp plate (13) of pushing down and constitute, third clamp plate (13) are fixed to be set up in the output of rotatory mechanism (12) of pushing down, be equipped with interval guiding mechanism on third clamp plate (13).

2. The welding fixture for the middle well frame of the automobile as claimed in claim 1, wherein the first clamping mechanism (9) comprises a first supporting seat (15) and two sets of pressing mechanisms (16) symmetrically arranged on the first supporting seat (15), each set of pressing mechanisms (16) comprises a carrier (17), a first air cylinder (18) and a first pressing plate (19), the cross-sectional shape of the first supporting seat (15) is L-shaped and horizontally arranged on the top of the welding table (7), the carrier (17) comprises a top plate (20), a bottom plate (21) and a vertical plate (23), the vertical plate (23) is arranged between the bottom plate (21) and the top plate (20) and fixedly connected with the top plate (20) at the upper end and the lower end respectively, the carrier (17) is fixedly arranged on the reentrant corner side of the first supporting seat (15), the first pressing plate (19) is arranged right below the top plate (20), the first air cylinder (18) is fixedly arranged on the top of the top plate (20) in a vertical state, the output end of the first air cylinder (18) downwards penetrates through the top plate (20) and is fixedly connected with the first pressing plate (19).

3. The welding tool for the middle well frame of the automobile according to claim 2, wherein the turnover mechanism (8) comprises a manual tilting rod (24) and two hinges (25), the two hinges (25) are fixedly arranged at the top of the first supporting seat (15) in a symmetrical state, the free end of each hinge (25) is connected with the corresponding top plate (20), the manual tilting rod (24) is composed of two connecting plates (26) and a pull rod (27), the lower ends of the two connecting plates (26) are fixedly arranged on the two top plates (20) respectively, and the pull rod (27) is arranged between the two connecting plates (26) and fixedly connected with the two connecting plates.

4. The welding tool for the automobile middle well frame is characterized in that the second clamping mechanism (10) comprises a second supporting seat (28), two second air cylinders (29) and four positioning pins (30), the shape of the second supporting seat (28) is matched with that of the second supporting rod (2), an accommodating groove for accommodating the second supporting rod (2) is formed in the second supporting seat (28), the two second air cylinders (29) are symmetrically arranged at two ends of one side, away from the first supporting rod (1), of the second supporting seat (28), the four positioning pins (30) matched with the positioning holes (6) in the second supporting rod (2) are arranged at the bottom of the inner side of the second supporting seat (28), the upper half part of each positioning pin (30) is of a conical structure, and the output end of each second air cylinder (29) is arranged on a push plate (22) used for clamping the inclined rod (5).

5. The welding tool for the automobile middle well frame is characterized in that the third clamping mechanism (11) further comprises a third supporting seat (31), the rotary pressing mechanism (12) comprises a rotary cylinder (32), a third cylinder (33) and a supporting top plate (34), the cross section of the third supporting seat (31) is U-shaped, the rotary cylinder (32) is fixedly arranged at the top of the welding table (7) and located on one side of the third supporting seat (31), the third cylinder (33) is fixedly arranged at the output end of the top of the rotary cylinder (32) in a vertical state, the output end of the third cylinder (33) extends vertically upwards, the supporting top plate (34) is fixedly connected with the output end of the third cylinder (33), and the free end of the supporting top plate (34) is connected with the distance adjusting mechanism.

6. The welding tool for the automobile middle lower well frame is characterized in that the distance adjusting mechanism comprises a hand-operated bidirectional threaded rod (35), a bearing seat (36) and two clamping plates (37), limiting grooves (38) avoiding the two clamping plates (37) are formed in two sides of a long edge of a third pressing plate (13), the bearing seat (36) is fixedly arranged in the center of the top of the third pressing plate (13) and axially corresponds to the direction of the long edge of a first pressing plate (19), the middle of the hand-operated bidirectional threaded rod (35) is fixedly arranged in the bearing seat (36), the axial direction of the hand-operated bidirectional threaded rod (35) is the same as the axial direction of the bearing seat (36), the clamping plates (37) are vertically arranged on two sides of the bottom of the third pressing plate (13), a threaded seat (39) matched with the hand-operated bidirectional threaded rod (35) is arranged at the upper end of each clamping plate (37), and a limiting strip (40) is arranged below the threaded seat (39), the limiting strips (40) are attached to the bottom of the third pressing plate (13), and the outer end of each limiting groove (38) is fixedly provided with a baffle (41).

7. The welding tool for the middle and lower well frame of the automobile as claimed in claim 4, wherein a rectangular through hole for avoiding the push plate (22) is formed in the side wall of the second supporting seat (28), and a transverse plate (43) for longitudinally pressing the inclined rod (5) is fixedly arranged on one side, away from the second cylinder (29), of the push plate (22).

8. The welding tool for the middle and lower well frame of the automobile as claimed in claim 2, wherein the bottom of the inner side of the first supporting seat (15) is symmetrically provided with a rectangular groove (44) avoiding the carrier (17), and the bottom plate (21) is provided with a sinking groove (45) for placing the first supporting rod (1).