Welding jig for ladder outer frame

Abstract

The invention relates to the field of automatic welding equipment, in particular to a ladder outer frame welding jig which comprises a base plate, and a cross beam jig is used for fixing a cross beam on the base plate; the left ladder column jig is used for placing a left ladder column on the base plate in the Y direction, and the bottom wall of the left ladder column abuts against the top wall of one end of the cross beam. The right ladder column jig is used for placing a right ladder column on the base plate in the Y direction, and the bottom wall of the right ladder column abuts against the top wall of the other end of the cross beam. The ladder stop jig is used for fixing a plurality of ladder stops on the base plate in the Y direction, and the bottom walls of the two ends of each ladder stop abut against the top walls of the left ladder column and the right ladder column correspondingly; the two inclined strut jigs are used for symmetrically fixing the two inclined struts to the base plate in the X direction, one ends of the two inclined struts abut against the inner side of the left ladder column and the inner side of the right ladder column respectively, and the other ends of the two inclined struts abut against the bottom wall of the same ladder stop. The embodiment of the invention can be applied to the laser welding robot with the rotary disk, so that automatic welding of the ladder outer frame can be realized.

Description

Technical Field

[0001] The invention relates to the field of automatic welding equipment, and in particular to a welding jig for a ladder outer frame. Background Art

[0002] The ladder frame is welded in one piece, and the operator needs to fix the left ladder column, right ladder column, ladder rungs, diagonal braces and crossbeam of the ladder frame in the fixture in turn, and then weld them into shape. Since the weld of the ladder frame is long, the cost of manual welding is extremely high. Therefore, people are in urgent need of equipment that can automatically weld the ladder frame. Summary of the invention

[0003] The purpose of the present invention is to provide a welding fixture for a ladder outer frame to solve the problem of how to fix the left ladder column, the right ladder column, the ladder steps, the diagonal brace and the crossbeam of the ladder outer frame, so as to provide a suitable welding environment for the automated welding of the ladder outer frame.

[0004] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: A welding jig for a ladder outer frame comprises a base plate, and a beam jig, a left ladder column jig, a right ladder column jig, a plurality of ladder rung jigs and two diagonal brace jigs installed on the base plate; the base plate has a top wall extending along the X direction and the Y direction, the X direction and the Y direction are both horizontal and perpendicular to each other, and the Z direction is perpendicular to the X direction and the Y direction; the beam jig is used to fix the beam on the base plate; the left ladder column jig is arranged on one side of the beam jig along the X direction, and is used to place the left ladder column on the base plate along the Y direction, and the bottom wall of the left ladder column rests on the top wall of one end of the beam; the right ladder column jig is arranged on the other side of the beam jig along the X direction, and is used to place the right ladder column on the base plate along the Y direction, and The bottom wall of the right ladder column rests on the top wall of the other end of the beam; the ladder step fixture is arranged between the left ladder column fixture and the right ladder column fixture, and multiple ladder step fixtures are arranged along the Y direction, used to fix multiple ladder steps on the base plate along the Y direction, and the bottom walls at both ends of each ladder step respectively abut against the top walls of the left ladder column and the right ladder column; the two diagonal brace fixtures are respectively arranged between the left ladder column fixture and one ladder step fixture, and between the right ladder column fixture and the same ladder step fixture, used to fix two diagonal braces symmetrically on the base plate along the X direction, and one end of the two diagonal braces rests on the inner side of the left ladder column and the right ladder column respectively, and the other ends of the two diagonal braces rest on the bottom wall of the same ladder step.

[0005] Furthermore, it also includes a left ladder column top rod and a right ladder column top rod installed on the base plate, a plurality of the left ladder column top rods are arranged along the length direction of the left ladder column, and are used to lift the two ends and the middle part of the left ladder column upward, and a plurality of the right ladder column top rods are arranged along the length direction of the right ladder column, and are used to lift the two ends and the middle part of the right ladder column upward; the left ladder column top rod is moved by a third linear drive, and the third linear drive is fixedly connected to the base plate, the left ladder column top rod is fixedly connected to the actuator of the third linear drive, and the left ladder column top rod is against a side of the left ladder column facing the base plate; the right ladder column top rod is moved by a fourth linear drive, and the fourth linear drive is fixedly connected to the base plate, the right ladder column top rod is fixedly connected to the actuator of the fourth linear drive, and the right ladder column top rod is against a side of the right ladder column facing the base plate.

[0006] Furthermore, the beam fixture includes: a beam positioning member, fixedly connected to the base plate, and used to place the beam on the base plate along the X direction; a beam pressure rod, movably connected to the base plate and arranged opposite to the beam positioning member along the Z direction, and used to push the beam along the Z direction so that it is pressed against the beam positioning member; a second rotary pressing driver, fixedly connected to the base plate and transmission-connected to the beam pressure rod, the second rotary pressing driver drives the beam pressure rod to press the top wall of the beam when it is necessary to constrain the beam, and drives the beam pressure rod to avoid the top of the beam when it is not necessary to constrain the beam.

[0007] Furthermore, the beam positioning member includes a beam support and a beam positioning pin, the beam support is used to support the bottom wall of the beam, the end of the beam positioning pin passes through the beam support from bottom to top and is located above the beam support, and the beam positioning pin is used to be inserted into the positioning hole on the beam.

[0008] Further, the left ladder column fixture includes: a plurality of left ladder column middle positioning members, fixedly connected to the base plate and arranged along the length direction of the left ladder column, the left ladder column middle positioning member having a shape that matches the concave surface of the left ladder column; a plurality of left ladder column middle pressure rods, movably connected to the base plate and arranged opposite to each of the left ladder column middle positioning members along the X direction, the left ladder column middle pressure rod is moved by a first linear drive, the first linear drive is fixedly connected to the base plate, the left ladder column middle pressure rod is fixedly connected to the actuator of the first linear drive, the first linear drive is used to push the left ladder column middle pressure rod along the X direction so that the left ladder column is pressed against the left ladder column middle positioning member; a left ladder column end positioning member, fixedly connected to the base plate and arranged at one end of the left ladder column, used to abut against one end of the left ladder column along the Y direction.

[0009] Further, the right ladder column fixture includes: a plurality of right ladder column middle positioning members, fixedly connected to the base plate and arranged along the length direction of the right ladder column; a plurality of right ladder column middle pressure rods, movably connected to the base plate and arranged opposite to each of the right ladder column middle positioning members along the X direction, the right ladder column middle pressure rod has a shape that matches the concave surface of the right ladder column, the right ladder column middle pressure rod is moved by a second linear drive, the second linear drive is fixedly connected to the base plate, the right ladder column middle pressure rod is fixedly connected to the actuator of the second linear drive, the second linear drive is used to push the right ladder column middle pressure rod along the X direction so that the right ladder column is pressed against the right ladder column middle positioning member; a right ladder column end positioning member, fixedly connected to the base plate and arranged at one end of the right ladder column, used to abut against one end of the right ladder column along the Y direction.

[0010] Furthermore, the diagonal brace fixture includes: two diagonal brace positioning members, fixedly connected to the base plate, and respectively close to the middle positioning member of the left ladder column farthest from the end positioning member of the left ladder column and the middle positioning member of the right ladder column farthest from the end positioning member of the right ladder column; two diagonal brace pressure rods, movably connected to the base plate, and arranged opposite to each of the diagonal brace positioning members along the Z direction, for pushing the diagonal brace pressure rods along the Z direction so that they are pressed tightly on the diagonal brace positioning members; two first rotary downward pressing drivers, fixedly connected to the base plate, and respectively transmission-connected to the two diagonal brace pressure rods, the first rotary downward pressing drivers drive the diagonal brace pressure rods to press the top wall of the diagonal brace when it is necessary to constrain the diagonal brace, and drive the diagonal brace pressure rods to avoid the top of the diagonal brace when it is not necessary to constrain the diagonal brace.

[0011] Furthermore, the diagonal brace positioning member includes a diagonal brace support, a diagonal brace clamp and a diagonal brace push rod, the diagonal brace support is fixedly connected to the base plate, the diagonal brace support has an inclined top wall for supporting the bottom wall of the diagonal brace, so that the diagonal brace can slide down under the action of gravity and one end of the diagonal brace rests against the concave surfaces of the left ladder column and the right ladder column; the two diagonal brace clamps are respectively connected to the two sides of the diagonal brace support, for constraining the two side walls of the diagonal brace; the diagonal brace push rod is connected to the relatively higher end of the two ends of the diagonal brace support, for lifting the top end of the diagonal brace.

[0012] Further, the ladder step fixture includes: a plurality of ladder step middle positioning members, fixedly connected to the base plate and arranged along the Y direction; a plurality of ladder step middle pressure rods, movably connected to the base plate and arranged opposite to each of the ladder step middle positioning members along the Z direction, for pushing the ladder step along the Z direction so that it is pressed against the ladder step middle positioning member; a plurality of ladder step end positioning members, movably connected to the base plate and arranged beside each of the ladder step middle positioning members along the X direction, for abutting against the end of the ladder step along the X direction so that it is positioned; a plurality of third rotary downward pressing drivers, fixedly connected to the base plate and transmission-connected to each of the ladder step middle pressure rods, the third rotary downward pressing drivers drive the ladder step middle pressure rod to press the top wall of the ladder step middle when the middle of the ladder step needs to be constrained, and drive the ladder step middle pressure rod to avoid the top of the ladder step when the middle of the ladder step does not need to be constrained.

[0013] Furthermore, the ladder step end positioning member includes a ladder step end top plate, a ladder step end pressure plate and a hinged support; the ladder step end top plate and the ladder step end pressure plate are an integral part, the ladder step end top plate and the ladder step end pressure plate are connected to the base plate through the hinged support, and the hinged support allows the ladder step end top plate and the ladder step end pressure plate to flip downward to press down the end of the ladder step, or flip upward to avoid the top of the ladder step, the ladder step end top plate is inclined toward one side of the ladder step, and the top edge of the ladder step end top plate is close to the ladder step, while the bottom edge of the ladder step end top plate is away from the ladder step, so that when the ladder step end top plate is flipped downward, the ladder step can be pushed in a direction away from itself, and when the ladder step end pressure plate presses the top wall of the ladder step, the ladder step is pushed to a specified position.

[0014] Compared with the prior art, this application has the following beneficial effects: Provided is a welding jig for a ladder outer frame. The welding jig can be applied to a laser welding robot with a rotating disk, thereby realizing automatic welding of the ladder outer frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] Figure 1 A three-dimensional diagram of a relatively long ladder frame; Figure 2 A three-dimensional diagram of a relatively short ladder frame; Figure 3A top view of an embodiment of the present invention; Figure 4 A top view of a working condition of machining a relatively short ladder frame according to an embodiment of the present invention; Figure 5 A three-dimensional view of a left ladder column fixture at one angle according to an embodiment of the present invention; Figure 6 A three-dimensional view of the left ladder column fixture from another angle according to an embodiment of the present invention; Figure 7 A three-dimensional view of a right ladder post fixture at one angle according to an embodiment of the present invention; Figure 8 is a three-dimensional diagram of a beam fixture according to an embodiment of the present invention; Fig. 9 A three-dimensional diagram of the beam fixture of an embodiment of the present invention from another angle; Fig.10 A three-dimensional diagram of a ladder step fixture according to an embodiment of the present invention; Fig.11 A three-dimensional diagram of a ladder step end positioning member according to an embodiment of the present invention; The numbers in the figure represent the following: 1-ladder frame; 11-left ladder column; 12-right ladder column; 13-ladder rung; 14-diagonal brace; 15-crossbeam; 2-base plate; 3-crossbeam fixture; 31-crossbeam positioning piece; 32-crossbeam support platform; 33-crossbeam positioning pin; 34-crossbeam pressure rod; 35-second rotary downward actuator; 4-left ladder column fixture; 41-left ladder column end positioning piece; 42-left ladder column middle positioning piece; 43-left ladder column middle pressure rod; 44-first linear actuator; 45-left ladder column top rod; 46-third linear actuator; 5-right ladder column fixture; 51-right ladder column end positioning piece; 52-right ladder column middle positioning piece; 53- The middle pressure rod of the right ladder column; 54-the second linear drive; 55-the top rod of the right ladder column; 56-the fourth linear drive; 6-the ladder step fixture; 61-the ladder step end positioning piece; 611-the ladder step end top plate; 612-the ladder step end pressure plate; 613-the hinged support; 62-the middle positioning piece of the ladder step; 621-the middle support platform of the ladder step; 622-the middle clamping plate of the ladder step; 63-the middle pressure rod of the ladder step; 64-the third rotary downward pressure drive; 7-the diagonal support fixture; 71-the diagonal support positioning piece; 711-the diagonal support platform; 712-the diagonal support clamping plate; 713-the diagonal support top rod; 72-the diagonal support pressure rod; 73-the first rotary downward pressure drive. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Hereinafter, the X direction is a horizontal direction, the Y direction is a horizontal direction and perpendicular to the X direction, and the Z direction is a vertical direction.

[0019] Figure 1 and Figure 2 Two ladder frames 1 of different lengths are shown respectively, each ladder frame 1 comprises a left ladder column 11, a right ladder column 12, a plurality of ladder steps 13, two diagonal braces 14 and a cross beam 15, wherein the length direction of the left ladder column 11 and the right ladder column 12 is substantially parallel to the Y direction, and the left ladder column 11 and the right ladder column 12 are bilaterally symmetrical along the X direction, a plurality of ladder steps 13 are welded to one side of the left ladder column 11 and the right ladder column 12 side by side along the Y direction, the cross beam 15 is welded to the other side of the left ladder column 11 and the right ladder column 12, the ladder steps 13 and the cross beam 15 are parallel to the X direction, there are two diagonal braces 14, one end of the two diagonal braces 14 is welded to the same ladder step 13, and the ladder step 13 is located at the lowest point of the left ladder column 11 and the right ladder column 12, and the other ends of the two diagonal braces 14 are respectively welded to the left ladder column 11 and the right ladder column 12.

[0020] The ladder outer frame 1 is welded in one piece, and an operator is required to fix the left ladder column 11, the right ladder column 12, the ladder rungs 13, the diagonal brace 14 and the crossbeam 15 of the ladder outer frame 1 in sequence in a fixture, and then weld them into shape. Since the weld of the ladder outer frame 1 is relatively long, the cost of manual welding is extremely high.

[0021] The existing welding robot can automatically weld parts, and only needs to manually fix the parts in the corresponding jigs. Usually, the automatic welding system includes two jigs, which are installed on a turntable so that the two jigs can exchange each other's workstations. One of the workstations is the loading and unloading workstation, where the operator removes the welded ladder frame 1 and then stacks the parts of the ladder frame 1. The other workstation is the welding workstation, where the robot welds the gaps between the parts.

[0022] Figure 3 A welding jig capable of fixing ladder frames 1 of different lengths is shown, wherein the welding jig comprises a base plate 2 having a top wall extending along the X direction and the Y direction, and mounted on the base plate 2: a crossbeam jig 3, a left ladder column jig 4, a right ladder column jig 5, a plurality of ladder rung jigs 6 and two diagonal brace jigs 7.

[0023] The beam fixture 3 is used to fix a beam 15 on the substrate 2 along the X direction; The left ladder post fixture 4 is arranged on one side of the beam fixture 3 along the X direction, and is used to place the left ladder post 11 on the substrate 2 along the Y direction, and the bottom wall of the left ladder post 11 rests on the top wall of one end of the beam 15; The right ladder post fixture 5 is arranged on the other side of the beam fixture 3 along the X direction, and is used to place the right ladder post 12 on the substrate 2 along the Y direction, and the bottom wall of the right ladder post 12 rests on the top wall of the other end of the beam 15; The ladder rung fixture 6 is arranged between the left ladder column fixture 4 and the right ladder column fixture 5, and a plurality of ladder rung fixtures 6 are arranged along the Y direction, so as to fix a plurality of ladder rungs 13 on the substrate 2 along the Y direction, and the bottom walls at both ends of each ladder rung 13 respectively abut against the top walls of the left ladder column 11 and the right ladder column 12; The two diagonal brace jigs 7 are respectively arranged between the left ladder column jig 4 and a ladder step jig 6, and between the right ladder column jig 5 and the same ladder step jig 6, and are used to fix the two diagonal braces 14 symmetrically on the base plate 2 along the X direction, and one end of the two diagonal braces 14 rests on the inner side of the left ladder column 11 and the right ladder column 12 respectively, and the other end of the two diagonal braces 14 rests on the bottom wall of the same ladder step 13.

[0024] Crossbeam fixture 3 includes: The crossbeam positioning member 31 is fixedly connected to the base plate 2 and is used to place the crossbeam 15 on the base plate 2 along the X direction; The crossbeam pressing rod 34 is movably connected to the base plate 2 and arranged opposite to the crossbeam positioning member 31 along the Z direction, and is used to push the crossbeam 15 along the Z direction so that the crossbeam 15 is pressed against the crossbeam positioning member 31 .

[0025] Left ladder column fixture 4 includes: A plurality of left ladder column middle positioning members 42, fixedly connected to the base plate 2, and arranged along the length direction of the left ladder column 11; A plurality of left ladder column middle pressure rods 43, movably connected to the base plate 2, and arranged opposite to each left ladder column middle positioning member 42 along the X direction, for pushing the left ladder column 11 along the X direction so that it is pressed against the left ladder column middle positioning member 42; The left ladder post end positioning member 41 is fixedly connected to the base plate 2 and is disposed at one end of the left ladder post 11 for abutting against one end of the left ladder post 11 along the Y direction.

[0026] Right ladder column fixture 5 includes: A plurality of right ladder column middle positioning members 52, fixedly connected to the base plate 2, and arranged along the length direction of the right ladder column 12; A plurality of right ladder column middle pressure rods 53, movably connected to the base plate 2, and arranged opposite to each right ladder column middle positioning member 52 along the X direction, for pushing the right ladder column 12 along the X direction so that it is pressed against the right ladder column middle positioning member 52; The right ladder post end positioning member 51 is fixedly connected to the base plate 2 and is disposed at one end of the right ladder post 12 for abutting against one end of the right ladder post 12 along the Y direction.

[0027] Ladder fixture 6 includes: A plurality of ladder step middle positioning members 62, fixedly connected to the base plate 2, and arranged along the Y direction; A plurality of ladder step middle pressure rods 63 are movably connected to the base plate 2 and are arranged opposite to each ladder step middle positioning member 62 along the Z direction, and are used to push the ladder step 13 along the Z direction so that it is pressed against the ladder step middle positioning member 62; A plurality of step end positioning members 61 are movably connected to the base plate 2 and are disposed beside each step middle positioning member 62 along the X direction, and are used to abut against the end of the step 13 along the X direction to position it.

[0028] The diagonal brace fixture 7 includes: Two diagonal support positioning members 71 are fixedly connected to the base plate 2 and are respectively close to the left ladder column middle positioning member 42 farthest from the left ladder column end positioning member 41 and the right ladder column middle positioning member 52 farthest from the right ladder column end positioning member 51; The two diagonal support pressing rods 72 are movably connected to the base plate 2 and are arranged opposite to each diagonal support positioning member 71 along the Z direction, and are used to push the diagonal support pressing rods 72 along the Z direction so that they are pressed tightly on the diagonal support positioning member 71.

[0029] Since the difference between the welding jigs for fixing different lengths is only the number of each positioning member and the pressure rod, in order to facilitate the display of the details of this embodiment, Figure 4 A welding jig capable of fixing a shorter portion is shown, while other parts of the welding jig are omitted. The jig includes a crossbeam positioning member 31, a crossbeam pressure rod 34, a left ladder column end positioning member 41, a right ladder column end positioning member 51, three left ladder column middle positioning members 42, three left ladder column middle pressure rods 43, three right ladder column middle positioning members 52, three right ladder column middle pressure rods 53, three ladder step middle positioning members 62, three ladder step middle pressure rods 63, three ladder step end positioning members 61, two diagonal brace positioning members 71 and two diagonal brace pressure rods 72.

[0030] Among them, a crossbeam positioning member 31 and a crossbeam pressure rod 34 are used to constrain a crossbeam, a base plate 2, a left ladder column end positioning member 41, three left ladder column middle positioning members 42 and three left ladder column middle pressure rods 43 are used to constrain a left ladder column, a base plate 2, a right ladder column end positioning member 51, three right ladder column middle positioning members 52 and three right ladder column middle pressure rods 53 are used to constrain a right ladder column, three ladder step middle positioning members 62, three ladder step middle pressure rods 63 and three ladder step end positioning members 61 are used to constrain three ladder steps, and two diagonal brace positioning members 71 and two diagonal brace pressure rods 72 are used to constrain two diagonal braces.

[0031] The longer ladder frame 1 has longer left ladder column 11 and right ladder column 12, and more ladder steps 13, so the welding fixture only needs to increase the number of left ladder column middle positioning piece 42, left ladder column middle pressure rod 43, right ladder column middle positioning piece 52, right ladder column middle pressure rod 53, ladder step middle positioning piece 62, ladder step middle pressure rod 63 and ladder step end positioning piece 61 accordingly.

[0032] In summary, the operator places the left ladder column 11, the right ladder column 12, the ladder rungs 13, the diagonal braces 14 and the crossbeam 15 of the specified number and specifications in the jig to fix them, and then moves the jig from the loading and unloading station to the welding station, and the ladder frame 1 can be automatically welded by the robot.

[0033] The specific structure of the fixture for each part is described below.

[0034] refer to Figure 5 and Figure 6 The left ladder column middle positioning piece 42 is used to abut against the inner side of the left ladder column. The left ladder column middle positioning piece 42 has a shape that matches the inner side of the left ladder column 11. The left ladder column middle pressure rod 43 is used to abut against the outer side of the left ladder column 11. The left ladder column middle pressure rod 43 is moved by the first linear drive 44. The first linear drive 44 is fixedly connected to the base plate 2. The left ladder column middle pressure rod 43 is fixedly connected to the actuator of the first linear drive 44, and the left ladder column middle pressure rod 43 abuts against the outer side of the left ladder column 11.

[0035] refer to Figure 5 and Figure 7 The left ladder column fixture 4 and the right ladder column fixture 5 are not symmetrical on the left and right. The middle positioning piece 52 of the right ladder column is used to abut against the outer side of the right ladder column 12, and the middle pressure rod 53 of the right ladder column is used to abut against the inner side of the right ladder column 12. The middle pressure rod 53 of the right ladder column is moved by the second linear drive 54. The middle pressure rod 53 of the right ladder column has a shape that matches the inner side of the right ladder column 12. The second linear drive 54 is fixedly connected to the base plate 2, and the middle pressure rod 53 of the right ladder column is fixedly connected to the actuator of the second linear drive 54, and the middle pressure rod 53 of the right ladder column abuts against the inner side of the right ladder column 12.

[0036] The advantage of this design is that the gap between the left ladder post 11 and the right ladder post 12 is not enough to place the left ladder post jig 4 and the right ladder post jig 5 at the same time. If the left ladder post jig 4 and the right ladder post jig 5 are placed on the outside of the left ladder post 11 and the right ladder post 12, the volume of the welding jig will be too large. Therefore, the preferred solution is to place one of the left ladder post jig 4 and the right ladder post jig 5 on the outside of the left ladder post 11 and the right ladder post 12, and the other one between the left ladder post 11 and the right ladder post 12.

[0037] Since the left ladder column 11 and the right ladder column 12 have a certain curvature, when one end and both sides of the two are fixed, the other ends of the two cannot move, so that the movement of the left ladder column 11 and the right ladder column 12 in the X direction and the Y direction is constrained.

[0038] Among them, the cross-sections of the left ladder column 11 and the right ladder column 12 are both C-shaped, the inner sides of the left ladder column 11 and the right ladder column 12 refer to the concave surfaces of the two, and the outer sides of the left ladder column 11 and the right ladder column 12 refer to the convex surfaces of the two. Since the middle positioning piece 42 of the left ladder column protrudes outward and is used to insert and match the concave surface of the left ladder column 11, and the middle pressure rod 53 of the right ladder column protrudes outward and is used to insert and match the concave surface of the right ladder column 12, the movement of the left ladder column 11 and the right ladder column 12 in the Z direction is constrained.

[0039] Furthermore, since the ladder outer frame 1 will be deformed to a certain extent after being welded, the friction between the ladder outer frame 1 and the left ladder column middle positioning piece 42 and the right ladder column middle positioning piece 52 will increase, making it difficult to remove the ladder outer frame 1. In order to facilitate the operator to remove the welded ladder outer frame 1 from the fixture, refer to Figure 5 , Figure 6 and Figure 7 The welding fixture also includes a left ladder column top rod 45 and a right ladder column top rod 55 installed on the base plate 2. Multiple left ladder column top rods 45 are arranged along the length direction of the left ladder column, and are used to lift the two ends and the middle part of the left ladder column 11 upward. Multiple right ladder column top rods 55 are arranged along the length direction of the right ladder column, and are used to lift the two ends and the middle part of the right ladder column 12 upward.

[0040] refer to Figure 5 The left ladder column top rod 45 is moved by the third linear drive 46, the third linear drive 46 is fixedly connected to the base plate 2, the left ladder column top rod 45 is fixedly connected to the actuator of the third linear drive 46, and the left ladder column top rod 45 is against the side of the left ladder column facing the base plate 2.

[0041] refer to Figure 7 The right ladder column top rod 55 is moved by the fourth linear drive 56, the fourth linear drive 56 is fixedly connected to the base plate 2, the right ladder column top rod 55 is fixedly connected to the actuator of the fourth linear drive 56, and the right ladder column top rod 55 is against the side of the right ladder column facing the base plate 2.

[0042] The first linear drive 44, the second linear drive 54, the third linear drive 46 and the fourth linear drive 56 may all be cylinders with guide rods.

[0043] refer to Figure 6 The diagonal support positioning member 71 includes: a diagonal support platform 711, a diagonal support clamping plate 712 and a diagonal support top rod 713.

[0044] The diagonal support platform 711 is fixedly connected to the base plate 2 and has an inclined top wall for supporting the bottom wall of the diagonal support 14 so that the diagonal support 14 can slide down under the action of gravity, thereby making one end of the diagonal support 14 rest against the inner side of the left ladder column 11 and the right ladder column 12.

[0045] The two diagonal brace clamping plates 712 are respectively connected to two sides of the diagonal brace support 711 to constrain the two side walls of the diagonal brace 14 .

[0046] The diagonal support rod 713 is connected to the relatively higher end of the diagonal support platform 711, and is used to support the top of the diagonal support 14. The diagonal support rod 713 is preferably a bolt, and the bolt is spirally connected to the diagonal support platform 711, so as to facilitate the adjustment of the inclination angle of the diagonal support 14.

[0047] The diagonal brace pressure rod 72 is moved by the first rotating downward pressing driver 73. The first rotating downward pressing driver 73 drives the diagonal brace pressure rod 72 to press the top wall of the diagonal brace when it is necessary to constrain the diagonal brace 14. When it is not necessary to constrain the diagonal brace 14, the diagonal brace pressure rod 72 is driven to avoid the top of the ladder outer frame 1, so that the ladder outer frame 1 is easy to take out.

[0048] refer to Figure 8 and Fig. 9 The beam positioning member 31 includes a beam support 32 and a beam positioning pin 33 .

[0049] The beam support 32 is used to support the bottom wall of the beam 15 . The end of the beam positioning pin 33 passes through the beam support 32 from bottom to top and is located above the beam support 32 . The beam positioning pin 33 is used to be inserted into the positioning hole on the beam 15 .

[0050] The beam pressing rod 34 is moved by the second rotating pressing driver 35. The second rotating pressing driver 35 drives the beam pressing rod 34 to press the top wall of the beam when it is necessary to constrain the beam 15. When it is not necessary to constrain the beam 15, it drives the beam pressing rod 34 to avoid the top of the ladder frame 1, so that the ladder frame 1 is easy to take out.

[0051] refer to Fig.10 The ladder step middle positioning member 62 includes a ladder step middle support platform 621 and a ladder step middle clamping plate 622 .

[0052] The ladder step middle support platform 621 is fixedly connected to the base plate 2 , and the ladder step middle support platform 621 is used to support the bottom wall of the ladder step 13 .

[0053] Two ladder step middle clamping plates 622 are connected to the ladder step middle supporting platform 621 , and the two ladder step middle clamping plates 622 are used to constrain two side walls of the ladder step 13 respectively.

[0054] The ladder step middle pressure rod 63 is moved by the third rotary downward pressure driver 64. The third rotary downward pressure driver 64 drives the ladder step middle pressure rod 63 to press the top wall of the middle of the ladder step 13 when it is necessary to constrain the middle of the ladder step 13, and drives the ladder step middle pressure rod 63 to avoid the top of the ladder outer frame 1 when it is not necessary to constrain the middle of the ladder step 13.

[0055] The first rotary pressing driver 73, the second rotary pressing driver 35 and the third rotary pressing driver 64 may all be rotary pressing cylinders.

[0056] refer to Fig.10 , Fig.11 The step end positioning member 61 includes a step end top plate 611 and a step end pressure plate 612 . The step end top plate 611 and the step end pressure plate 612 are an integral part.

[0057] The ladder step end top plate 611 is mounted on the base plate 2 . The ladder step end top plate 611 is disposed at one end of the ladder step 13 and is used to abut against the end surface of the ladder step.

[0058] The step end pressure plate 612 is fixedly connected to the top edge of the step end top plate 611 to constrain the top wall of the step 13 .

[0059] The step end positioning member 61 is connected to the base plate 2 via an articulated support 613 , which allows the step end positioning member 61 to flip downward to press down and clamp the end of the step 13 , or flip upward to avoid the top of the ladder frame 1 .

[0060] The top plate 611 at the end of the ladder step is inclined toward one side of the ladder step 13, and the top edge of the top plate 611 at the end of the ladder step is close to the ladder step 13, while the bottom edge of the top plate 611 at the end of the ladder step is away from the ladder step 13, so that when the ladder step end positioning piece 61 is flipped downward, the ladder step 13 can be pushed away from itself. Finally, when the ladder step end pressure plate 612 presses the top wall of the ladder step 13, the ladder step 13 is pushed to the specified position.

[0061] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A welding fixture for a ladder frame, characterized in that: It comprises a base plate (2), and a crossbeam jig (3), a left ladder column jig (4), a right ladder column jig (5), a plurality of ladder rung jigs (6) and two diagonal brace jigs (7) mounted on the base plate (2); The substrate (2) has a top wall extending along the X direction and the Y direction, the X direction and the Y direction are both horizontal and perpendicular to each other, and the Z direction is perpendicular to the X direction and the Y direction; The crossbeam fixture (3) is used to fix the crossbeam (15) on the substrate (2); The left ladder post jig (4) is arranged on one side of the crossbeam jig (3) along the X direction, and is used to place the left ladder post (11) on the base plate (2) along the Y direction, with the bottom wall of the left ladder post (11) resting on the top wall of one end of the crossbeam (15); The right ladder post jig (5) is arranged on the other side of the crossbeam jig (3) along the X direction, and is used to place the right ladder post (12) on the base plate (2) along the Y direction, and the bottom wall of the right ladder post (12) rests on the top wall of the other end of the crossbeam (15); The ladder rung fixture (6) is arranged between the left ladder column fixture (4) and the right ladder column fixture (5), and a plurality of the ladder rung fixtures (6) are arranged along the Y direction, and are used to fix a plurality of ladder runs (13) on the substrate (2) along the Y direction, and the bottom walls at both ends of each ladder rung (13) respectively abut against the top walls of the left ladder column (11) and the right ladder column (12); The two diagonal brace jigs (7) are respectively arranged between the left ladder column jig (4) and a ladder step jig (6), and between the right ladder column jig (5) and the same ladder step jig (6), and are used to fix the two diagonal braces (14) symmetrically on the base plate (2) along the X direction, and one end of the two diagonal braces (14) rests on the inner side of the left ladder column (11) and the right ladder column (12), respectively, and the other end of the two diagonal braces (14) rests on the bottom wall of the same ladder step (13).

2. A welding jig for a ladder frame according to claim 1, characterized in that: It also includes a left ladder column top rod (45) and a right ladder column top rod (55) mounted on the base plate (2), wherein a plurality of the left ladder column top rods (45) are arranged along the length direction of the left ladder column and are used to lift the two ends and the middle part of the left ladder column (11) upwards, and a plurality of the right ladder column top rods (55) are arranged along the length direction of the right ladder column and are used to lift the two ends and the middle part of the right ladder column (12) upwards; The left ladder column top rod (45) is moved by a third linear drive (46), the third linear drive (46) is fixedly connected to the base plate (2), the left ladder column top rod (45) is fixedly connected to an actuator of the third linear drive (46), and the left ladder column top rod (45) abuts against a side of the left ladder column facing the base plate (2); The right ladder column top rod (55) is moved by a fourth linear drive (56), the fourth linear drive (56) is fixedly connected to the base plate (2), the right ladder column top rod (55) is fixedly connected to an actuator of the fourth linear drive (56), and the right ladder column top rod (55) abuts against a side of the right ladder column facing the base plate (2).

3. A welding jig for a ladder frame according to claim 1, characterized in that: The crossbeam fixture (3) comprises: A crossbeam positioning member (31) fixedly connected to the base plate (2) and used to place the crossbeam (15) on the base plate (2) along the X direction; A crossbeam pressing rod (34) movably connected to the base plate (2) and arranged opposite to the crossbeam positioning member (31) along the Z direction, and used for pushing the crossbeam (15) along the Z direction so that the crossbeam is pressed against the crossbeam positioning member (31); The second rotary downward pressing driver (35) is fixedly connected to the base plate (2) and is drivingly connected to the beam pressing rod (34). The second rotary downward pressing driver (35) drives the beam pressing rod (34) to press the top wall of the beam when it is necessary to constrain the beam (15), and drives the beam pressing rod (34) to avoid the top of the beam (15) when it is not necessary to constrain the beam (15).

4. A welding jig for a ladder frame according to claim 3, characterized in that: The crossbeam positioning member (31) comprises a crossbeam support platform (32) and a crossbeam positioning pin (33); the crossbeam support platform (32) is used to support the bottom wall of the crossbeam (15); the end of the crossbeam positioning pin (33) passes through the crossbeam support platform (32) from bottom to top and is located above the crossbeam support platform (32); the crossbeam positioning pin (33) is used to be inserted into the positioning hole on the crossbeam (15).

5. The welding jig for the ladder frame according to claim 1, characterized in that: The left ladder column fixture (4) comprises: A plurality of left ladder column middle positioning members (42) are fixedly connected to the base plate (2) and are arranged along the length direction of the left ladder column (11); the left ladder column middle positioning members (42) have a shape that matches the concave surface of the left ladder column (11); A plurality of left ladder column middle pressure rods (43) are movably connected to the base plate (2) and are arranged opposite to each left ladder column middle positioning member (42) along the X direction. The left ladder column middle pressure rods (43) are moved by a first linear drive (44). The first linear drive (44) is fixedly connected to the base plate (2). The left ladder column middle pressure rods (43) are fixedly connected to an actuator of the first linear drive (44). The first linear drive (44) is used to push the left ladder column middle pressure rods (43) along the X direction so that the left ladder column (11) is pressed against the left ladder column middle positioning member (42). A left ladder column end positioning piece (41) is fixedly connected to the base plate (2) and is arranged at one end of the left ladder column (11) and is used to abut against one end of the left ladder column (11) along the Y direction.

6. A welding jig for a ladder frame according to claim 5, characterized in that: The right ladder column fixture (5) includes: A plurality of right ladder column middle positioning members (52) fixedly connected to the base plate (2) and arranged along the length direction of the right ladder column (12); A plurality of right ladder column middle pressure rods (53) are movably connected to the base plate (2) and are arranged opposite to each right ladder column middle positioning member (52) along the X direction. The right ladder column middle pressure rod (53) has a shape that matches the concave surface of the right ladder column (12). The right ladder column middle pressure rod (53) is moved by a second linear drive (54). The second linear drive (54) is fixedly connected to the base plate (2). The right ladder column middle pressure rod (53) is fixedly connected to an actuator of the second linear drive (54). The second linear drive (54) is used to push the right ladder column middle pressure rod (53) along the X direction so that the right ladder column (12) is pressed tightly against the right ladder column middle positioning member (52). A right ladder post end positioning piece (51) is fixedly connected to the base plate (2) and is arranged at one end of the right ladder post (12) and is used to abut against one end of the right ladder post (12) along the Y direction.

7. A welding jig for a ladder frame according to claim 6, characterized in that: The diagonal bracing fixture (7) comprises: Two diagonal support positioning members (71) are fixedly connected to the base plate (2) and are respectively close to the left ladder column middle positioning member (42) farthest from the left ladder column end positioning member (41) and the right ladder column middle positioning member (52) farthest from the right ladder column end positioning member (51); Two diagonal support pressing rods (72) are movably connected to the base plate (2) and are arranged opposite to each diagonal support positioning member (71) along the Z direction, and are used to push the diagonal support pressing rods (72) along the Z direction so that the diagonal support pressing rods (72) are pressed tightly against the diagonal support positioning members (71); Two first rotary downward pressing drivers (73) are fixedly connected to the base plate (2) and are respectively connected to the two diagonal support pressure rods (72) in a transmission manner. The first rotary downward pressing drivers (73) drive the diagonal support pressure rods (72) to press the top wall of the diagonal support when it is necessary to constrain the diagonal support (14), and drive the diagonal support pressure rods (72) to avoid the top of the diagonal support (14) when it is not necessary to constrain the diagonal support (14).

8. A welding jig for a ladder frame according to claim 7, characterized in that: The diagonal support positioning member (71) comprises a diagonal support platform (711), a diagonal support clamping plate (712) and a diagonal support top rod (713); the diagonal support platform (711) is fixedly connected to the base plate (2); the diagonal support platform (711) has an inclined top wall for supporting the bottom wall of the diagonal support (14), so that the diagonal support (14) can slide down under the action of gravity and one end of the diagonal support (14) can abut against the concave surfaces of the left ladder column (11) and the right ladder column (12); The two diagonal brace clamping plates (712) are respectively connected to two sides of the diagonal brace support platform (711) and are used to constrain two side walls of the diagonal brace (14); The diagonal support push rod (713) is connected to a relatively higher end of the two ends of the diagonal support platform (711) and is used to support the top end of the diagonal support (14).

9. The welding jig for the ladder frame according to claim 1, characterized in that: The ladder fixture (6) includes: A plurality of ladder step middle positioning members (62) fixedly connected to the base plate (2) and arranged along the Y direction; A plurality of ladder step middle pressure rods (63) movably connected to the base plate (2) and arranged opposite to each ladder step middle positioning member (62) along the Z direction, and used for pushing the ladder step (13) along the Z direction so that the ladder step (13) is pressed against the ladder step middle positioning member (62); A plurality of ladder step end positioning members (61) are movably connected to the base plate (2) and are arranged beside each ladder step middle positioning member (62) along the X direction, and are used to abut against the end of the ladder step (13) along the X direction to position the ladder step (13); A plurality of third rotary downward pressing drivers (64) are fixedly connected to the base plate (2) and are drivingly connected to each ladder step middle pressure rod (63). The third rotary downward pressing drivers (64) drive the ladder step middle pressure rod (63) to press the top wall of the middle of the ladder step (13) when it is necessary to constrain the middle of the ladder step (13), and drive the ladder step middle pressure rod (63) to avoid the top of the ladder step (13) when it is not necessary to constrain the middle of the ladder step (13).

10. A welding jig for a ladder frame according to claim 9, characterized in that: The step end positioning member (61) comprises a step end top plate (611), a step end pressure plate (612) and a hinged support (613); The ladder step end top plate (611) and the ladder step end pressure plate (612) are an integral part, and the ladder step end top plate (611) is connected to the base plate (2) via the hinged support (613). The hinged support (613) allows the ladder step end top plate (611) and the ladder step end pressure plate (612) to flip downward to press down the end of the ladder step (13), or to flip upward to avoid the top of the ladder step (13). The ladder step end top plate (611) faces The ladder step (13) is tilted toward one side of the ladder step (13), and the top edge of the ladder step end top plate (611) is close to the ladder step (13), while the bottom edge of the ladder step end top plate (611) is away from the ladder step (13), so that when the ladder step end top plate (611) is turned downward, the ladder step (13) can be pushed in a direction away from itself, and when the ladder step end pressure plate (612) presses the top wall of the ladder step (13), the ladder step (13) is pushed to a specified position.

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