A welding jig for a ladder frame

Abstract

The present application relates to the field of automatic welding equipment, and particularly relates to a welding jig for a ladder frame, comprising a base plate, a cross beam jig for fixing a cross beam on the base plate; a left ladder column jig for placing a left ladder column on the base plate along the Y direction, and the bottom wall of the left ladder column is placed on the top wall of one end of the cross beam; a right ladder column jig for placing a right ladder column on the base plate along the Y direction, and the bottom wall of the right ladder column is placed on the top wall of the other end of the cross beam; a ladder step jig for fixing a plurality of ladder steps on the base plate along the Y direction, and the bottom walls of both ends of each ladder step are respectively placed against the top walls of the left and right ladder columns; two diagonal bracing jigs are respectively used for fixing two diagonal braces on the base plate along the X direction symmetrically, and one end of each of the two diagonal braces is placed against the inner side of the left and right ladder columns, and the other end of each of the two diagonal braces is placed against the bottom wall of the same ladder step. The embodiment of the present application can be applied to a laser welding robot with a rotary disc, so that automatic welding of the ladder frame can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automatic welding equipment, in particular to a welding jig for a ladder frame. BACKGROUND

[0002] The ladder frame is integrally welded and formed, and an operator needs to sequentially fix the left ladder column, the right ladder column, the ladder rung, the diagonal brace and the cross beam of the ladder frame in the jig, and then weld and form, since the length of the welding seam of the ladder frame is relatively long, the cost of manual welding is extremely high, therefore, people urgently need equipment capable of automatically welding the ladder frame. SUMMARY

[0003] The present application aims to provide a welding jig for a ladder frame, to solve the problem of how to fix the left ladder column, the right ladder column, the ladder rung, the diagonal brace and the cross beam of the ladder frame, thereby providing a suitable welding environment for automatic welding of the ladder frame.

[0004] To solve the above technical problems, the present application specifically provides the following technical solutions:

[0005] A welding jig for a ladder frame, comprising a base plate, and a cross 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 cross beam jig is used to fix the cross beam on the base plate; the left ladder column jig is arranged on one side of the cross beam jig along the X direction, and is used to place the left ladder column on the base plate along the Y direction, with the bottom wall of the left ladder column resting on the top wall of one end of the cross beam; the right ladder column jig is arranged on the other side of the cross beam jig along the X direction, and is used to place the right ladder column on the base plate along the Y direction, with the bottom wall of the right ladder column resting on the top wall of the other end of the cross beam; the ladder rung jigs are arranged between the left ladder column jig and the right ladder column jig, and a plurality of the ladder rung jigs are arranged along the Y direction, and are used to fix a plurality of ladder rungs on the base plate along the Y direction, with the bottom walls of both ends of each ladder rung respectively abutting against the top walls of the left ladder column and the right ladder column; two diagonal brace jigs are respectively arranged between the left ladder column jig and one ladder rung jig, and between the right ladder column jig and the same ladder rung jig, and are used to symmetrically fix two diagonal braces on the base plate along the X direction, with one end of each of the two diagonal braces resting on the inner side of the left ladder column and the right ladder column, and the other end of each of the two diagonal braces resting on the bottom wall of the same ladder rung.

[0006] Further, a left ladder post top rod and a right ladder post top rod are installed on the base plate, a plurality of the left ladder post top rods are arranged along the length direction of the left ladder post for lifting the two ends and the middle part of the left ladder post upward, and a plurality of the right ladder post top rods are arranged along the length direction of the right ladder post for lifting the two ends and the middle part of the right ladder post upward; the left ladder post top rod moves through a third linear actuator, the third linear actuator is fixedly connected to the base plate, the left ladder post top rod is fixedly connected to the execution part of the third linear actuator, and the left ladder post top rod abuts against the side of the left ladder post facing the base plate; the right ladder post top rod moves through a fourth linear actuator, the fourth linear actuator is fixedly connected to the base plate, the right ladder post top rod is fixedly connected to the execution part of the fourth linear actuator, and the right ladder post top rod abuts against the side of the right ladder post facing the base plate.

[0007] Further, the cross beam jig comprises: a cross beam positioning member fixedly connected to the base plate for placing the cross beam on the base plate along the X direction; a cross beam pressing rod movably connected to the base plate and arranged opposite to the cross beam positioning member along the Z direction for pushing the cross beam along the Z direction to press it on the cross beam positioning member; and a second rotary pressing-down actuator fixedly connected to the base plate and transmissionally connected to the cross beam pressing rod, the second rotary pressing-down actuator drives the cross beam pressing rod to press the top wall of the cross beam when the cross beam needs to be constrained, and drives the cross beam pressing rod to avoid the top of the cross beam when the cross beam does not need to be constrained.

[0008] Further, the cross beam positioning member comprises a cross beam supporting table for supporting the bottom wall of the cross beam and a cross beam positioning pin, the end of the cross beam positioning pin penetrates through the cross beam supporting table from bottom to top and is located above the cross beam supporting table, and the cross beam positioning pin is used for inserting into the positioning hole on the cross beam.

[0009] Further, the left ladder post jig comprises: a plurality of left ladder post middle part positioning members fixedly connected to the base plate and arranged along the length direction of the left ladder post, the left ladder post middle part positioning members have shapes matching the concave surface of the left ladder post; a plurality of left ladder post middle part pressing rods movably connected to the base plate and arranged opposite to each of the left ladder post middle part positioning members along the X direction, the left ladder post middle part pressing rods move through a first linear actuator, the first linear actuator is fixedly connected to the base plate, the left ladder post middle part pressing rods are fixedly connected to the execution part of the first linear actuator, and the first linear actuator is used for pushing the left ladder post middle part pressing rods along the X direction to press the left ladder post on the left ladder post middle part positioning members; and a left ladder post end part positioning member fixedly connected to the base plate and arranged at one end of the left ladder post for abutting against one end of the left ladder post along the Y direction.

[0010] Further, the right ladder post jig comprises: a plurality of right ladder post middle positioning members fixedly connected to the base plate and arranged along the length direction of the right ladder post; a plurality of right ladder post middle pressing rods movably connected to the base plate and arranged opposite to each of the right ladder post middle positioning members along the X direction, the right ladder post middle pressing rod has a shape matching the concave surface of the right ladder post, the right ladder post middle pressing rod is moved by a second linear actuator fixedly connected to the base plate, the right ladder post middle pressing rod is fixedly connected to the execution part of the second linear actuator, and the second linear actuator is used to push the right ladder post middle pressing rod along the X direction so that the right ladder post is pressed on the right ladder post middle positioning member; and a right ladder post end positioning member fixedly connected to the base plate and arranged at one end of the right ladder post for abutting against one end of the right ladder post along the Y direction.

[0011] Further, the diagonal brace jig comprises: two diagonal brace positioning members fixedly connected to the base plate and respectively close to the left ladder post middle positioning member farthest from the left ladder post end positioning member and the right ladder post middle positioning member farthest from the right ladder post end positioning member; two diagonal brace pressing 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 pressing rod along the Z direction so that it is pressed on the diagonal brace positioning member; and two first rotary pressing-down actuators fixedly connected to the base plate and respectively drivingly connected to the two diagonal brace pressing rods, the first rotary pressing-down actuator drives the diagonal brace pressing rod to press the top wall of the diagonal brace when the diagonal brace needs to be constrained, and drives the diagonal brace pressing rod to avoid the top of the diagonal brace when the diagonal brace does not need to be constrained.

[0012] Further, the diagonal brace positioning member comprises a diagonal brace support, a diagonal brace clamping plate and a diagonal brace top 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 under the action of gravity and so that one end of the diagonal brace abuts against the concave surface of the left ladder post and the right ladder post; the two diagonal brace clamping plates are respectively connected to the two sides of the diagonal brace support for constraining the two side walls of the diagonal brace; and the diagonal brace top rod is connected to the relatively higher one of the two ends of the diagonal brace support for lifting the top end of the diagonal brace.

[0013] Further, the ladder step tool comprises: a plurality of middle ladder step positioning members fixedly connected to the base plate and arranged along the Y direction; a plurality of middle ladder step pressing rods movably connected to the base plate and arranged along the Z direction opposite to each of the middle ladder step positioning members, used for pushing the ladder step along the Z direction to press it on the middle ladder step positioning member; a plurality of end ladder step positioning members movably connected to the base plate and arranged along the X direction on the side of each of the middle ladder step positioning members, used for abutting against the end of the ladder step along the X direction to position it; and a plurality of third rotary pressing drivers fixedly connected to the base plate and drivingly connected to each of the middle ladder step pressing rods, the third rotary pressing driver drives the middle ladder step pressing rod to press the top wall of the middle of the ladder step when the middle of the ladder step needs to be constrained, and drives the middle ladder step pressing rod to avoid the above of the ladder step when the middle of the ladder step does not need to be constrained.

[0014] Further, the end ladder step positioning member comprises an end ladder step top plate, an end ladder step pressing plate and a hinged support, the end ladder step top plate and the end ladder step pressing plate are an integral piece, the end ladder step top plate is connected to the base plate through the hinged support, the hinged support allows the end ladder step top plate and the end ladder step pressing plate to be flipped downward to press the end of the ladder step, or to be flipped upward to avoid the above of the ladder step, one side of the end ladder step top plate is arranged obliquely towards the ladder step, and the top edge of the end ladder step top plate is close to the ladder step, and the bottom edge of the end ladder step top plate is away from the ladder step, so that when the end ladder step top plate is flipped downward, the ladder step can be pushed towards the direction away from itself, and when the end ladder step pressing plate presses the top wall of the ladder step, the ladder step is pushed to the specified position.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] The welding tool for the ladder frame can be applied to a laser welding robot with a rotary disc, so that automatic welding of the ladder frame can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and other drawings can also be obtained according to the provided drawings without creative labor for those skilled in the art.

[0018] Figure 1 is a perspective view of a relatively long ladder frame;

[0019] Figure 2A perspective view of a relatively short ladder frame;

[0020] Figure 3 A top view of an embodiment of the present invention;

[0021] Figure 4 A top view of a working condition of processing a relatively short ladder frame of an embodiment of the present invention;

[0022] Figure 5 A perspective view of a left ladder column jig of an embodiment of the present invention from one angle;

[0023] Figure 6 A perspective view of a left ladder column jig of an embodiment of the present invention from another angle;

[0024] Figure 7 A perspective view of a right ladder column jig of an embodiment of the present invention from one angle;

[0025] Figure 8 A perspective view of a crossbeam jig of an embodiment of the present invention;

[0026] Figure 9 A perspective view of a crossbeam jig of an embodiment of the present invention from another angle;

[0027] Figure 10 A perspective view of a ladder step jig of an embodiment of the present invention;

[0028] Figure 11 A perspective view of a ladder step end positioning member of an embodiment of the present invention;

[0029] The reference numerals in the drawings represent the following:

[0030] 1-frame; 11-left ladder leg; 12-right ladder leg; 13-ladder rung; 14-diagonal brace; 15-crossbeam; 2-base plate; 3-crossbeam jig; 31-crossbeam positioning member; 32-crossbeam support; 33-crossbeam positioning pin; 34-crossbeam pressing rod; 35-second rotary pressing driver; 4-left ladder leg jig; 41-left ladder leg end positioning member; 42-left ladder leg middle positioning member; 43-left ladder leg middle pressing rod; 44-first linear driver; 45-left ladder leg ejector pin; 46-third linear driver; 5-right ladder leg jig; 51-right ladder leg end positioning member; 52-right ladder leg middle positioning member; 53-right ladder leg middle pressing rod; 54-second linear driver; 55-right ladder leg ejector pin; 56-fourth linear driver; 6-ladder rung jig; 61-ladder rung end positioning member; 611-ladder rung end top plate; 612-ladder rung end pressing plate; 613-hinge support; 62-ladder rung middle positioning member; 621-ladder rung middle support; 622-ladder rung middle clamping plate; 63-ladder rung middle pressing rod; 64-third rotary pressing driver; 7-diagonal brace jig; 71-diagonal brace positioning member; 711-diagonal brace support; 712-diagonal brace clamping plate; 713-diagonal brace ejector pin; 72-diagonal brace pressing rod; 73-first rotary pressing driver. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0032] In the following, the X direction is the horizontal direction, the Y direction is the horizontal direction and perpendicular to the X direction, and the Z direction is the vertical direction.

[0033] Figure 1 and Figure 2 Two frames 1 of different lengths are shown respectively, each frame 1 comprising a left ladder leg 11, a right ladder leg 12, a plurality of ladder rungs 13, two diagonal braces 14 and a crossbeam 15, wherein the length direction of the left ladder leg 11 and the right ladder leg 12 is substantially parallel to the Y direction, and the left ladder leg 11 and the right ladder leg 12 are left-right symmetrical along the X direction, the plurality of ladder rungs 13 are welded side by side along the Y direction on one side of the left ladder leg 11 and the right ladder leg 12, the crossbeam 15 is welded on the other side of the left ladder leg 11 and the right ladder leg 12, the ladder rungs 13 and the crossbeam 15 are parallel to the X direction, and the two diagonal braces 14 have one end welded to the same ladder rung 13, and the ladder rung 13 is located at the lowest position of the left ladder leg 11 and the right ladder leg 12, and the other end of the two diagonal braces 14 is welded to the left ladder leg 11 and the right ladder leg 12 respectively.

[0034] The ladder frame 1 is integrally welded and molded, and the left ladder column 11, the right ladder column 12, the ladder bar 13, the diagonal brace 14 and the cross beam 15 of the ladder frame 1 need to be fixed in the jig in sequence by the operator, and then welded and molded. Since the length of the weld of the ladder frame 1 is relatively long, the cost of manual welding is extremely high.

[0035] The existing welding robot can automatically weld parts, and only needs to manually fix the parts in the corresponding jig. Usually, two jigs are included in the automatic welding system, and the two jigs are installed on a rotary disc, so that the two jigs can exchange the workstations with each other. One of the workstations is a feeding and discharging workstation, where the operator disassembles the welded ladder frame 1, and then stacks the parts of the ladder frame 1. The other workstation is a welding workstation, where the robot welds the gap between the parts.

[0036] Figure 3 A welding jig capable of fixing ladder frames 1 of different lengths is shown. The welding jig includes a base plate 2, which has a top wall extending in the X direction and the Y direction, and a cross beam jig 3, a left ladder column jig 4, a right ladder column jig 5, a plurality of ladder bar jigs 6 and two diagonal brace jigs 7 installed on the base plate 2.

[0037] The cross beam jig 3 is used to fix a cross beam 15 along the X direction on the base plate 2;

[0038] The left ladder column jig 4 is arranged on one side of the cross beam jig 3 along the X direction, and is used to arrange a left ladder column 11 along the Y direction on the base plate 2, and the bottom wall of the left ladder column 11 is arranged on the top wall of one end of the cross beam 15;

[0039] The right ladder column jig 5 is arranged on the other side of the cross beam jig 3 along the X direction, and is used to arrange a right ladder column 12 along the Y direction on the base plate 2, and the bottom wall of the right ladder column 12 is arranged on the top wall of the other end of the cross beam 15;

[0040] The ladder bar jigs 6 are arranged between the left ladder column jig 4 and the right ladder column jig 5, and a plurality of ladder bar jigs 6 are arranged along the Y direction, and are used to fix a plurality of ladder bars 13 along the Y direction on the base plate 2, and the bottom walls of both ends of each ladder bar 13 are arranged on the top walls of the left ladder column 11 and the right ladder column 12, respectively;

[0041] The two diagonal brace jigs 7 are arranged between the left ladder column jig 4 and one of the ladder bar jigs 6, and between the right ladder column jig 5 and the same ladder bar jig 6, respectively, and are used to fix two diagonal braces 14 along the X direction on the base plate 2, and one end of each of the two diagonal braces 14 is arranged on the inner side of the left ladder column 11 and the right ladder column 12, respectively, and the other end of each of the two diagonal braces 14 is arranged on the bottom wall of the same ladder bar 13.

[0042] The cross beam jig 3 includes:

[0043] A crossbeam positioning member 31 is fixedly connected to the base plate 2 and is used to swing the crossbeam 15 along the X direction on the base plate 2;

[0044] A crossbeam pressing rod 34 is movably connected to the base plate 2 and is 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 on the crossbeam positioning member 31.

[0045] The left ladder column jig 4 comprises:

[0046] 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;

[0047] A plurality of left ladder column middle pressing 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, and are used to push the left ladder column 11 along the X direction so that the left ladder column 11 is pressed on the left ladder column middle positioning member 42;

[0048] A left ladder column end positioning member 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.

[0049] The right ladder column jig 5 comprises:

[0050] A plurality of right ladder column middle positioning members 52 are fixedly connected to the base plate 2 and are arranged along the length direction of the right ladder column 12;

[0051] A plurality of right ladder column middle pressing 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, and are used to push the right ladder column 12 along the X direction so that the right ladder column 12 is pressed on the right ladder column middle positioning member 52;

[0052] A right ladder column end positioning member 51 is fixedly connected to the base plate 2 and is arranged at one end of the right ladder column 12, and is used to abut against one end of the right ladder column 12 along the Y direction.

[0053] The ladder step jig 6 comprises:

[0054] A plurality of ladder step middle positioning members 62 are fixedly connected to the base plate 2 and are arranged along the Y direction;

[0055] A plurality of ladder step middle pressing 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 the ladder step 13 is pressed on the ladder step middle positioning member 62;

[0056] 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 so that the ladder step 13 is positioned.

[0057] The diagonal brace jig 7 comprises:

[0058] Two diagonal brace positioning members 71 are fixedly connected to the base plate 2 and are respectively located near 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;

[0059] Two diagonal brace pressing rods 72 are movably connected to the base plate 2 and are arranged opposite to each diagonal brace positioning member 71 in the Z direction, for pushing the diagonal brace pressing rod 72 in the Z direction so that it is pressed against the diagonal brace positioning member 71.

[0060] Since the difference between fixing different lengths of welding fixtures is only in the number of each positioning member and pressing rod, in order to facilitate the display of the details of the present embodiment, Figure 4 a shorter welding fixture is shown, and other parts of the welding fixture are omitted, which includes one cross beam positioning member 31, one cross beam pressing rod 34, one left ladder column end positioning member 41, one right ladder column end positioning member 51, three left ladder column middle positioning members 42, three left ladder column middle pressing rods 43, three right ladder column middle positioning members 52, three right ladder column middle pressing rods 53, three ladder step middle positioning members 62, three ladder step middle pressing rods 63, three ladder step end positioning members 61, two diagonal brace positioning members 71 and two diagonal brace pressing rods 72.

[0061] Among them, one cross beam positioning member 31 and one cross beam pressing rod 34 are used to constrain one cross beam, the base plate 2, one left ladder column end positioning member 41, three left ladder column middle positioning members 42 and three left ladder column middle pressing rods 43 are used to constrain one left ladder column, the base plate 2, one right ladder column end positioning member 51, three right ladder column middle positioning members 52 and three right ladder column middle pressing rods 53 are used to constrain one right ladder column, three ladder step middle positioning members 62, three ladder step middle pressing 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 pressing rods 72 are used to constrain two diagonal braces.

[0062] The longer ladder frame 1 has longer left and right ladder columns 11 and 12 and more ladder steps 13, so the welding fixture only needs to increase the number of left ladder column middle positioning members 42, left ladder column middle pressing rods 43, right ladder column middle positioning members 52, right ladder column middle pressing rods 53, ladder step middle positioning members 62, ladder step middle pressing rods 63 and ladder step end positioning members 61.

[0063] In summary, the operator places the specified number and specifications of left and right ladder columns 11 and 12, ladder steps 13, diagonal braces 14 and cross beams 15 in the fixture, which are fixed, and then the fixture moves from the feeding and discharging station to the welding station, so that the ladder frame 1 can be automatically welded by the robot.

[0064] The specific structure of the jig of each part is described below.

[0065] Reference is made to Figure 5 and Figure 6 The left ladder post middle part positioning member 42 is used to abut against the inner side of the left ladder post, and has a shape that matches the inner side of the left ladder post 11. The left ladder post middle part pressing rod 43 is used to abut against the outer side of the left ladder post 11, and is moved by the first linear actuator 44. The first linear actuator 44 is fixedly connected to the base plate 2, and the left ladder post middle part pressing rod 43 is fixedly connected to the execution part of the first linear actuator 44, and abuts against the outer side of the left ladder post 11.

[0066] Reference is made to Figure 5 and Figure 7 The left ladder post jig 4 and the right ladder post jig 5 are not left-right symmetrical. The right ladder post middle part positioning member 52 is used to abut against the outer side of the right ladder post 12. The right ladder post middle part pressing rod 53 is used to abut against the inner side of the right ladder post 12, and is moved by the second linear actuator 54. The right ladder post middle part pressing rod 53 has a shape that matches the inner side of the right ladder post 12. The second linear actuator 54 is fixedly connected to the base plate 2, and the right ladder post middle part pressing rod 53 is fixedly connected to the execution part of the second linear actuator 54, and abuts against the inner side of the right ladder post 12.

[0067] 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 simultaneously place the left ladder post jig 4 and the right ladder post jig 5. If the left ladder post jig 4 and the right ladder post jig 5 are placed on the outer sides of the left ladder post 11 and the right ladder post 12, it will result in an excessively large welding jig. Therefore, the preferred solution is that one of the left ladder post jig 4 and the right ladder post jig 5 is placed on the outer side of the left ladder post 11 and the right ladder post 12, and the other is placed between the left ladder post 11 and the right ladder post 12.

[0068] Since the left ladder post 11 and the right ladder post 12 each have a certain curvature, when one end and both sides of each are fixed, the other end of each cannot move, thereby constraining the movement of the left ladder post 11 and the right ladder post 12 in the X direction and the Y direction.

[0069] The cross sections of the left ladder post 11 and the right ladder post 12 are each C-shaped. The inner sides of the left ladder post 11 and the right ladder post 12 refer to the concave surfaces thereof. The outer sides of the left ladder post 11 and the right ladder post 12 refer to the convex surfaces thereof. Since the left ladder post middle part positioning member 42 protrudes outward to be inserted into and match the concave surface of the left ladder post 11, and the right ladder post middle part pressing rod 53 protrudes outward to be inserted into and match the concave surface of the right ladder post 12, the movement of the left ladder post 11 and the right ladder post 12 in the Z direction is constrained.

[0070] Further, since the ladder frame 1 will be deformed after welding, the friction between the ladder frame 1 and the left ladder column middle positioning member 42 and the right ladder column middle positioning member 52 will increase, which makes it difficult to take out the ladder frame 1. In order to facilitate the operator to take out the welded ladder frame 1 from the jig, referring to Figure 5 、 Figure 6 and Figure 7 , the welding jig further comprises a left ladder column top rod 45 and a right ladder column top rod 55 installed on the base plate 2. The plurality of left ladder column top rods 45 are arranged along the length direction of the left ladder column, for lifting the two ends and the middle of the left ladder column 11 upward. The plurality of right ladder column top rods 55 are arranged along the length direction of the right ladder column, for lifting the two ends and the middle of the right ladder column 12 upward.

[0071] Referring to Figure 5 , the left ladder column top rod 45 moves through a third linear actuator 46 fixedly connected to the base plate 2. The left ladder column top rod 45 is fixedly connected to the execution part of the third linear actuator 46, and abuts against the side of the left ladder column facing the base plate 2.

[0072] Referring to Figure 7 , the right ladder column top rod 55 moves through a fourth linear actuator 56 fixedly connected to the base plate 2. The right ladder column top rod 55 is fixedly connected to the execution part of the fourth linear actuator 56, and abuts against the side of the right ladder column facing the base plate 2.

[0073] The above-mentioned first linear actuator 44, the second linear actuator 54, the third linear actuator 46 and the fourth linear actuator 56 can all adopt a guide rod cylinder.

[0074] Referring to Figure 6 , the diagonal brace positioning member 71 comprises a diagonal brace support 711, a diagonal brace clamping plate 712 and a diagonal brace top rod 713.

[0075] The diagonal brace support 711 is fixedly connected to the base plate 2, and has an inclined top wall for supporting the bottom wall of the diagonal brace 14, so that the diagonal brace 14 can slide downward under the action of gravity, so that one end of the diagonal brace 14 abuts against the inner side of the left ladder column 11 and the right ladder column 12.

[0076] Two diagonal brace clamping plates 712 are respectively connected to the two sides of the diagonal brace support 711, for constraining the two side walls of the diagonal brace 14.

[0077] The diagonal brace top rod 713 is connected to the relatively higher one of the two ends of the diagonal brace support 711, for lifting the top end of the diagonal brace 14. The diagonal brace top rod 713 is preferably a bolt, and the bolt is screw-connected with the diagonal brace support 711, so as to facilitate adjustment of the inclination angle of the diagonal brace 14.

[0078] The diagonal brace pressing rod 72 is moved by the first rotating downward pressing driver 73, which drives the diagonal brace pressing rod 72 to press against the top wall of the diagonal brace 14 when the diagonal brace 14 needs to be constrained, and drives the diagonal brace pressing rod 72 to avoid the upper part of the ladder frame 1 when the diagonal brace 14 does not need to be constrained, so that the ladder frame 1 is easily taken out.

[0079] With reference to Figure 8 and Figure 9 , the cross beam positioning member 31 comprises a cross beam supporting table 32 and a cross beam positioning pin 33.

[0080] The cross beam supporting table 32 is used to support the bottom wall of the cross beam 15, and the end of the cross beam positioning pin 33 penetrates the cross beam supporting table 32 from bottom to top and is located above the cross beam supporting table 32, and the cross beam positioning pin 33 is used to be inserted into the positioning hole on the cross beam 15.

[0081] The cross beam pressing rod 34 is moved by the second rotating downward pressing driver 35, which drives the cross beam pressing rod 34 to press against the top wall of the cross beam 15 when the cross beam 15 needs to be constrained, and drives the cross beam pressing rod 34 to avoid the upper part of the ladder frame 1 when the cross beam 15 does not need to be constrained, so that the ladder frame 1 is easily taken out.

[0082] With reference to Figure 10 , the middle part of the ladder step positioning member 62 comprises a middle part of the ladder step supporting table 621 and a middle part of the ladder step clamping plate 622.

[0083] The middle part of the ladder step supporting table 621 is fixedly connected to the base plate 2, and the middle part of the ladder step supporting table 621 is used to support the bottom wall of the ladder step 13.

[0084] Two middle part of the ladder step clamping plates 622 are connected to the middle part of the ladder step supporting table 621, and the two middle part of the ladder step clamping plates 622 are respectively used to constrain the two side walls of the ladder step 13.

[0085] The middle part of the ladder step pressing rod 63 is moved by the third rotating downward pressing driver 64, which drives the middle part of the ladder step pressing rod 63 to press against the top wall of the middle part of the ladder step 13 when the middle part of the ladder step 13 needs to be constrained, and drives the middle part of the ladder step pressing rod 63 to avoid the upper part of the ladder frame 1 when the middle part of the ladder step 13 does not need to be constrained.

[0086] The above-mentioned first rotating downward pressing driver 73, the second rotating downward pressing driver 35 and the third rotating downward pressing driver 64 can all adopt a rotating downward pressing cylinder.

[0087] With reference to Figure 10 , Figure 11 , the end part of the ladder step positioning member 61 comprises an end part of the ladder step top plate 611 and an end part of the ladder step pressing plate 612, and the end part of the ladder step top plate 611 and the end part of the ladder step pressing plate 612 are an integral piece.

[0088] The ladder end top plate 611 is installed on the base plate 2, and is arranged at one end of the ladder 13 and used to abut against the end face of the ladder.

[0089] The ladder end pressing plate 612 is fixedly connected to the top edge of the ladder end top plate 611, and is used to constrain the top wall of the ladder 13.

[0090] The ladder end positioning member 61 is connected to the base plate 2 through the hinged support 613, and the hinged support 613 allows the ladder end positioning member 61 to be flipped downward to press and clamp the end of the ladder 13, or to be flipped upward to avoid the upper part of the ladder outer frame 1.

[0091] One side of the ladder end top plate 611 is arranged to be inclined towards the ladder 13, and the top edge of the ladder end top plate 611 is close to the ladder 13, while the bottom edge of the ladder end top plate 611 is away from the ladder 13, so that when the ladder end positioning member 61 is flipped downward, the ladder 13 can be pushed away from the ladder end positioning member 61, and finally when the ladder end pressing plate 612 presses the top wall of the ladder 13, the ladder 13 is pushed to the specified position.

[0092] The above embodiments are only exemplary embodiments of the present application, and are not used to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements are also regarded as falling within the protection scope of the embodiments of the present application.

Claims

1. A welding jig for a ladder frame, characterized in that, it comprises a base plate (2), and a cross beam jig (3), a left stave jig (4), a right stave jig (5), a plurality of rung jigs (6) and two diagonal brace jigs (7) installed on the base plate (2); the base plate (2) is provided with a top wall extending along the X direction and the Y direction, both of which are horizontal and perpendicular to each other, and the Z direction is perpendicular to the X direction and the Y direction; the cross beam jig (3) is used to fix the cross beam (15) on the base plate (2); the left stave jig (4) is arranged on one side of the cross beam jig (3) along the X direction, used to place the left stave (11) on the base plate (2) along the Y direction, and the bottom wall of the left stave (11) is placed on the top wall of one end of the cross beam (15); the right stave jig (5) is arranged on the other side of the cross beam jig (3) along the X direction, used to place the right stave (12) on the base plate (2) along the Y direction, and the bottom wall of the right stave (12) is placed on the top wall of the other end of the cross beam (15); the rung jig (6) is arranged between the left stave jig (4) and the right stave jig (5), and a plurality of rung jigs (6) are arranged along the Y direction, used to fix a plurality of rungs (13) on the base plate (2) along the Y direction, and the bottom walls of both ends of each rung (13) are respectively placed on the top walls of the left stave (11) and the right stave (12); two diagonal brace jigs (7) are respectively arranged between the left stave jig (4) and a rung jig (6), and between the right stave jig (5) and the same rung jig (6), used to fix two diagonal braces (14) on the base plate (2) along the X direction symmetrically, and one end of each of the two diagonal braces (14) is placed on the inner side of the left stave (11) and the right stave (12), and the other end of each of the two diagonal braces (14) is placed on the bottom wall of the same rung (13); it further comprises a left stave top rod (45) and a right stave top rod (55) installed on the base plate (2), a plurality of left stave top rods (45) are arranged along the length direction of the left stave, used to lift the two ends and the middle part of the left stave (11) upward, and a plurality of right stave top rods (55) are arranged along the length direction of the right stave, used to lift the two ends and the middle part of the right stave (12) upward; the left stave top rod (45) is moved by a third linear actuator (46), the third linear actuator (46) is fixedly connected to the base plate (2), the left stave top rod (45) is fixedly connected to the execution part of the third linear actuator (46), and the left stave top rod (45) is placed against the side of the left stave facing the base plate (2); The right ladder post top rod (55) is moved by a fourth linear driver (56) fixedly connected to the base plate (2), the right ladder post top rod (55) is fixedly connected to the execution part of the fourth linear driver (56), and the right ladder post top rod (55) abuts against one side of the right ladder post facing the base plate (2); The left ladder post jig (4) comprises: A plurality of left ladder post middle part positioning members (42) are fixedly connected to the base plate (2) and arranged along the length direction of the left ladder post (11), and the left ladder post middle part positioning member (42) has a shape matching the concave surface of the left ladder post (11); A plurality of left ladder post middle part pressing rods (43) are movably connected to the base plate (2) and arranged opposite to each left ladder post middle part positioning member (42) along the X direction, the left ladder post middle part pressing rod (43) is moved by a first linear driver (44) fixedly connected to the base plate (2), the left ladder post middle part pressing rod (43) is fixedly connected to the execution part of the first linear driver (44), and the first linear driver (44) is used to push the left ladder post middle part pressing rod (43) along the X direction so that the left ladder post (11) is pressed on the left ladder post middle part positioning member (42); A left ladder post end part positioning member (41) is fixedly connected to the base plate (2) and arranged at one end of the left ladder post (11) for abutting against one end of the left ladder post (11) along the Y direction; The right ladder post jig (5) comprises: A plurality of right ladder post middle part positioning members (52) are fixedly connected to the base plate (2) and arranged along the length direction of the right ladder post (12); A plurality of right ladder post middle part pressing rods (53) are movably connected to the base plate (2) and arranged opposite to each right ladder post middle part positioning member (52) along the X direction, the right ladder post middle part pressing rod (53) has a shape matching the concave surface of the right ladder post (12), the right ladder post middle part pressing rod (53) is moved by a second linear driver (54) fixedly connected to the base plate (2), the right ladder post middle part pressing rod (53) is fixedly connected to the execution part of the second linear driver (54), and the second linear driver (54) is used to push the right ladder post middle part pressing rod (53) along the X direction so that the right ladder post (12) is pressed on the right ladder post middle part positioning member (52); A right ladder post end part positioning member (51) is fixedly connected to the base plate (2) and arranged at one end of the right ladder post (12) for abutting against one end of the right ladder post (12) along the Y direction.

2. The welding jig of the outer frame of the ladder according to claim 1, wherein The cross beam jig (3) comprises: A cross beam positioning member (31) is fixedly connected to the base plate (2) for placing the cross beam (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) in the Z direction, used to push the crossbeam (15) in the Z direction so that it is pressed against the crossbeam positioning member (31); A second rotary pressing driver (35) fixedly connected to the base plate (2) and drivingly connected to the crossbeam pressing rod (34), the second rotary pressing driver (35) drives the crossbeam pressing rod (34) to press against the top wall of the crossbeam when the crossbeam (15) needs to be constrained, and drives the crossbeam pressing rod (34) to avoid the top of the crossbeam (15) when the crossbeam (15) does not need to be constrained.

3. The welding jig of the ladder frame according to claim 2, wherein the crossbeam positioning member (31) comprises a crossbeam support (32) and a crossbeam positioning pin (33), the crossbeam support (32) is used to support the bottom wall of the crossbeam (15), and the end of the crossbeam positioning pin (33) penetrates through the crossbeam support (32) from bottom to top and is located above the crossbeam support (32), and the crossbeam positioning pin (33) is used to be inserted into the positioning hole on the crossbeam (15).

4. The welding jig of the ladder frame according to claim 1, wherein the diagonal brace jig (7) comprises: two diagonal brace positioning members (71) fixedly connected to the base plate (2) and 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 brace pressing rods (72) movably connected to the base plate (2) and arranged opposite to each of the diagonal brace positioning members (71) in the Z direction, used to push the diagonal brace pressing rods (72) in the Z direction so that they are pressed against the diagonal brace positioning members (71); two first rotary pressing drivers (73) fixedly connected to the base plate (2) and respectively drivingly connected to the two diagonal brace pressing rods (72), the first rotary pressing drivers (73) drive the diagonal brace pressing rods (72) to press against the top wall of the diagonal brace (14) when the diagonal brace (14) needs to be constrained, and drive the diagonal brace pressing rods (72) to avoid the top of the diagonal brace (14) when the diagonal brace (14) does not need to be constrained.

5. The welding jig of the ladder frame according to claim 4, wherein the diagonal brace positioning member (71) comprises a diagonal brace support (711), a diagonal brace clamping plate (712) and a diagonal brace top rod (713), the diagonal brace support (711) is fixedly connected to the base plate (2), the diagonal brace support (711) has an inclined top wall, used to support the bottom wall of the diagonal brace (14), so that the diagonal brace (14) can slide downward under the action of gravity and so that one end of the diagonal brace (14) abuts against the concave surface of the left ladder column (11) and the right ladder column (12); two diagonal brace clamping plates (712) are respectively connected to the two sides of the diagonal brace support (711), used to constrain the two side walls of the diagonal brace (14); ​ ​ ​ The diagonal brace top rod (713) is connected to the relatively higher end of the two ends of the diagonal brace support base (711), and is used for jacking up the top end of the diagonal brace (14).

6. The welding jig for the outer frame of the ladder according to claim 1, wherein, The ladder step jig (6) comprises: a plurality of middle part positioning members (62) fixedly connected to the base plate (2) and arranged along the Y direction; a plurality of middle part pressing rods (63) movably connected to the base plate (2) and arranged opposite to each of the middle part positioning members (62) along the Z direction, used for pushing the ladder step (13) along the Z direction so that the ladder step (13) is pressed on the middle part positioning members (62); a plurality of end part positioning members (61) movably connected to the base plate (2) and arranged along the X direction on the side of each of the middle part positioning members (62), used for abutting against the end part of the ladder step (13) along the X direction so that the ladder step (13) is positioned; a plurality of third rotary pressing drivers (64) fixedly connected to the base plate (2) and drivingly connected to each of the middle part pressing rods (63), the third rotary pressing driver (64) drives the middle part pressing rod (63) to press the top wall of the middle part of the ladder step (13) when the middle part of the ladder step (13) needs to be constrained, and drives the middle part pressing rod (63) to avoid the top of the ladder step (13) when the middle part of the ladder step (13) does not need to be constrained.

7. The welding jig for the outer frame of the ladder according to claim 6, wherein, The end part positioning member (61) comprises an end part top plate (611), an end part pressing plate (612) and a hinged support (613); The end part top plate (611) and the end part pressing plate (612) are an integral piece, the end part top plate (611) is connected to the base plate (2) through the hinged support (613), the hinged support (613) allows the end part top plate (611) and the end part pressing plate (612) to be flipped downward to press the end part of the ladder step (13), or to be flipped upward to avoid the top of the ladder step (13), one side of the end part top plate (611) facing the ladder step (13) is arranged obliquely, and the top edge of the end part top plate (611) is close to the ladder step (13), while the bottom edge of the end part top plate (611) is away from the ladder step (13), so that when the end part top plate (611) is flipped downward, the ladder step (13) can be pushed in the direction away from the end part top plate (611), and when the end part pressing plate (612) presses the top wall of the ladder step (13), the ladder step (13) is pushed to the specified position.

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