Flexible point assembly tool for forklift mast and point assembly fixing method for mast

Abstract

The application discloses a flexible assembly jig for a forklift mast and a mast assembly fixing method. When the flexible assembly jig is used, a pin hole positioning shaft is used in cooperation with a low positioning seat to fix a mast roller installation hole; the pin hole positioning shaft is used in cooperation with a high positioning seat and a spacer to fix an outer mast frame installation hole; a positioning block and a limiting block are used to form a mast slide way fixing assembly to position a mast roller slide way; a threaded hole positioning shaft, a positioning shaft installation block and a positioning angle ruler are used to form a threaded hole positioning assembly to fix an outer mast oil cylinder installation hole and a chain installation hole; a limiting block and a positioning angle ruler are used to form a mast lower cross beam fixing block to support a mast lower cross beam; and the limiting block is used to limit the mast end portion. The application has high flexibility and strong universality, can improve the positioning accuracy and positioning efficiency of the mast workpiece, and ensures that the workpiece is firmly positioned during welding.

Description

TECHNICAL FIELD

[0001] The present application relates to the auxiliary equipment for engineering machinery manufacturing, and particularly relates to a flexible assembly jig for a forklift mast and a mast assembly fixing method. BACKGROUND

[0002] The mast of a forklift is used for mounting a fork and is a key component for lifting goods, and thus the welding quality of the mast structure is related to the stability and safety of the forklift. The structure of the forklift mast is relatively complex and is generally composed of two layers, i.e., an inner layer and an outer layer. The parallelism, perpendicularity and distance between the structural components need to be strictly controlled during the welding process of the mast, otherwise problems such as jamming and tilting will occur during the operation of the forklift. Since the forklift models and the mast sizes are diverse, it is difficult to provide special jigs for controlling the accuracy of the welding process in actual production.

[0003] At present, when welding the mast of a forklift, a manual line marking positioning method is generally used to assemble and assemble various plates. Specifically, the welding position is first marked on the surface of a steel plate, and then the structural components to be welded are aligned with the marked line during the welding process, and a clamp is used for fixation to ensure the relative positions between the structural components. However, the manual line marking positioning method for positioning the structural components of the forklift mast has the following problems. Since the line marking position is determined by manual measurement during the process, the line marking speed is slow and the accuracy cannot be guaranteed, resulting in difficulty in placing the structural components. In addition, since a general clamp is used instead of a special jig during the welding process, the welding quality cannot be guaranteed and the production efficiency is low.

[0004] Therefore, it is necessary to design a special assembly jig with universality for the mast of a forklift to solve the problems of difficult positioning and fixation of the structural components, low welding efficiency and poor welding quality during the welding process of the mast of a forklift. SUMMARY

[0005] The first object of the present application is to provide a flexible assembly jig for a forklift mast with strong universality to solve the problems of difficulty in determining the welding position of the structural components, low positioning accuracy and efficiency, difficulty in clamping and fixing the structural components and easy loosening during the assembly and welding process of the mast of a forklift. The second object of the present application is to provide a mast assembly fixing method based on the flexible assembly jig for a forklift mast.

[0006] Technical scheme: The first aspect of the present application provides a flexible assembly jig for a forklift mast, which comprises a jig platform, a limiting block, a high positioning seat, a low positioning seat, a positioning angle ruler, a pin shaft hole positioning shaft, a threaded hole positioning shaft, a spacer, a positioning block and a positioning shaft mounting block.

[0007] The limiting block, the high positioning seat, the low positioning seat and the positioning angle ruler can be detachably fixed on the jig platform.

[0008] The pin hole positioning shaft is used for fixing the portal roller mounting hole or the outer portal frame mounting hole. When the portal roller mounting hole is fixed, the pin hole positioning shaft is inserted into the low positioning seat. When the outer portal frame mounting hole is fixed, the pin hole positioning shaft is inserted into the high positioning seat. The spacer sleeve is sleeved on the pin hole positioning shaft and is used for positioning the distance between the inner and outer support plates of the frame hole.

[0009] The positioning block is used for positioning the portal roller slide. When positioned, the positioning block is detachably fixed on the limiting block to form a portal slide fixing assembly.

[0010] The threaded hole positioning shaft is used for fixing the outer portal oil cylinder mounting hole and the chain mounting hole. When fixed, the threaded hole positioning shaft is mounted on the positioning shaft mounting block, the positioning shaft mounting block is detachably fixed on the positioning angle ruler, and a threaded hole positioning assembly is formed.

[0011] The limiting block and the positioning angle ruler can be combined into a portal lower cross beam fixing block for supporting the portal lower cross beam.

[0012] The limiting block is also used for limiting the portal end.

[0013] Further, the upper end surface and the peripheral side surface of the tool platform are distributed with a series of bolt holes.

[0014] The limiting block comprises an L-shaped main plate, a long slot hole plate, a long circular hole plate and a short circular hole plate which are respectively and perpendicularly connected to the three side edges of the L-shaped main plate. The two ends of the long circular hole plate are respectively and perpendicularly connected to the long slot hole plate and the short circular hole plate. The L-shaped main plate, the long circular hole plate and the short circular hole plate are distributed with bolt holes. The long slot hole plate is provided with a slot hole along the long edge thereof.

[0015] The high positioning seat and the low positioning seat are both square frame structures, the lower surfaces thereof are distributed with bolt holes, and the left and right side surfaces thereof are provided with pin shaft through holes for mounting the pin hole positioning shaft.

[0016] The positioning angle ruler comprises a ruler hole plate and a ruler slot plate which are perpendicularly connected. The ruler hole plate is distributed with bolt holes, and the ruler slot plate is provided with a slot hole along the long edge thereof.

[0017] The limiting block and the positioning shaft mounting block are both provided with bolt holes.

[0018] The limiting block, the high positioning seat, the low positioning seat and the positioning angle ruler are connected and fixed with the tool platform through locking pins. The limiting block, the positioning angle ruler, the limiting block and the positioning shaft mounting block are also connected with each other through locking pins.

[0019] Further, the diameter of the pin hole on the tooling platform is d; the position of the pin hole on the upper working surface is determined by the cross grid lines, and the distance between adjacent pin holes is l; the position of the pin hole on the front, rear, left and right working surfaces is determined by two groups of cross grid lines, and the distance between the two groups of grid lines in the horizontal direction is 0.5l; the grid lines on adjacent working surfaces are perpendicular to each other, and the grid lines on opposite working surfaces are parallel to each other;

[0020] The diameter of the pin hole on the L-shaped main plate, the long circular hole plate and the short circular hole plate is d, and the distance between the pin holes is 0.5l; the width of the slot hole on the long slot hole plate is d, and the length is 2l;

[0021] The lower surface of each of the high positioning seat and the low positioning seat is distributed with pin holes with a diameter of d along the four sides, and the distance between the pin holes is an integer multiple of l;

[0022] The diameter of the pin hole on the angle ruler hole plate is d, and the distance between the pin holes is 0.5l; the width of the slot hole on the angle ruler slot plate is d, and the length is l;

[0023] The positioning block and the positioning shaft mounting block are provided with pin holes with a diameter of d and a distance of 0.5l.

[0024] In the technical solution, the pin holes provided on the tooling platform and the pin holes on each component not only serve to be fixedly connected with each other, but also have a positioning function, so that the positioning accuracy and the positioning assembly efficiency of the portal frame component can be further improved.

[0025] Further, the forklift portal flexible assembly tooling further comprises a side limit block provided with pin holes with a diameter of d and a distance of 0.5l, and is fixed on the side surface of the tooling platform by a locking pin, and is used for limiting the portal.

[0026] Further, the forklift portal flexible assembly tooling further comprises a pad for adjusting the fixed height of the portal.

[0027] Further, the front and rear surfaces of the high positioning seat are provided with reinforcing plates.

[0028] The second aspect of the present application provides a portal assembly fixing method, which adopts the forklift portal flexible assembly tooling, and comprises the following steps of:

[0029] The inner portal roller mounting holes at the four corners of the inner portal of the forklift are fixed, the pin shaft hole positioning shaft is inserted into the low positioning seat and the inner portal roller mounting hole, and the low positioning seat is fixed on the tooling platform by a locking pin;

[0030] The limit block is fixed on the tooling platform by a locking pin, the positioning block and the limit block are fixed by a locking pin to form a portal slide fixing assembly, and the outer side of the inner portal roller slide is fixed by using the portal slide fixing assembly.

[0031] The two limit blocks are fixed on the work platform by locking pins. The long slot hole plate of one limit block and the long round hole plate of the other limit block are opposite and fixed by locking pins. The upper ends of the two limit blocks are flush. The positioning angle ruler is fixed on the outside of the L-shaped main plate of one limit block by locking pins. The angle ruler hole plate of the positioning angle ruler extends out of the upper end of the two limit blocks. Thus, the inner door frame lower cross beam fixing block is combined. The upper ends of the two limit blocks support the inner door frame lower cross beam. The extended angle ruler hole plate positions the inner door frame lower cross beam. The inner door frame lower cross beam fixing block is fixed on the work platform by locking pins.

[0032] The end of the forklift inner door frame is supported by two limit blocks. The two limit blocks are fixed on the work platform by locking pins.

[0033] Further, the door frame assembly fixing method also includes assembling and fixing the outer door frame of the forklift:

[0034] The two outer door frame rack mounting holes of the forklift outer door frame are fixed. The pin shaft hole positioning shaft is inserted into the high positioning seat and the outer door frame rack mounting hole. The distance between the inner and outer support plates of the rack hole is fixed by using a spacer. The high positioning seat is fixed on the work platform by locking pins.

[0035] The two outer door frame roller mounting holes of the forklift outer door frame are fixed. The pin shaft hole positioning shaft is inserted into the low positioning seat and the outer door frame roller mounting hole. The low positioning seat is fixed on the work platform by locking pins.

[0036] The assembled door frame slide fixing assembly is fixed on the work platform by locking pins. The positioning block and the limit block are fixed by locking pins to form the door frame slide fixing assembly. The inner side of the outer door frame roller slide is fixed by using the door frame slide fixing assembly.

[0037] The assembled threaded hole positioning assembly is composed of a positioning angle ruler, a positioning shaft mounting block and a threaded hole positioning shaft. The threaded hole positioning shaft is inserted into the outer door frame cylinder mounting hole and the chain mounting hole. The positioning angle ruler is fixed on the work platform by locking pins. The outer door frame cylinder mounting hole and the chain mounting hole are fixed.

[0038] The assembled outer door frame lower cross beam fixing block is composed of a long round hole plate of one limit block and an angle ruler slot plate of a positioning angle ruler. The long slot hole plate of the limit block supports the outer door frame lower cross beam.

[0039] The end of the forklift outer door frame is supported by two limit blocks. The two limit blocks are fixed on the work platform by locking pins.

[0040] Further, if the size of the forklift door frame is large and cannot be limited by the limit block, the side limit block is installed on the side of the work platform to limit the end of the forklift door frame.

[0041] Further, when the forklift mast size exceeds the tool platform, a positioning angle ruler is installed on the side of the tool platform to expand the working surface of the tool platform.

[0042] Beneficial effects: compared with the prior art, the present application has the following significant advantages:

[0043] The flexible point assembly tool provided by the present application has high flexibility and strong versatility, and the same tool can meet the internal and external mast welding fixing requirements of various models of forklifts. When used, the positioning accuracy of the structural parts during the point assembly welding process of the forklift mast can be improved, and the welding efficiency can be improved; through the fixation of the mast slide and the installation hole and other positions, the clamping stability can be ensured, and the loosening is not easy.

[0044] The present application can ensure the size accuracy of the mast workpiece assembly while realizing rapid positioning and point assembly of the workpiece, thereby improving the production quality and efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application are briefly introduced as follows. Obviously, the drawings described below are only the embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0046] Figure 1 is a structural schematic diagram of the flexible point assembly tool of the forklift mast in the embodiments of the present application;

[0047] Figure 2 is a structural schematic diagram of the tool platform in the embodiments of the present application;

[0048] Figure 3 is a structural schematic diagram of the limiting block in the embodiments of the present application;

[0049] Figure 4 is a structural schematic diagram of the high positioning seat in the embodiments of the present application;

[0050] Figure 5 is a structural schematic diagram of the low positioning seat in the embodiments of the present application;

[0051] Figure 6 is a structural schematic diagram of the positioning angle ruler in the embodiments of the present application;

[0052] Figure 7 is a structural schematic diagram of the inner mast lower cross beam fixing block in the embodiments of the present application;

[0053] Figure 8 is a structural schematic diagram of the outer mast lower cross beam fixing block in the embodiments of the present application;

[0054] Figure 9 is a schematic diagram of the inner mast point fixing of the forklift in the embodiment of the present application;

[0055] Figure 10 is a schematic diagram of the outer mast point fixing of the forklift in the embodiment of the present application;

[0056] The figure marks: 1, tooling platform; 2, limiting block; 201, L-shaped main plate; 202, long slot hole plate; 203, long round hole plate; 204, short round hole plate; 3, high positioning seat; 4, low positioning seat; 5, positioning angle ruler; 6, pin shaft hole positioning shaft; 7, threaded hole positioning shaft; 8, bushing; 9, spacer sleeve; 10, positioning block; 11, positioning shaft mounting block; 12, side limiting block. DETAILED DESCRIPTION

[0057] 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 not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0058] Figure 1 A flexible point fixing tool for the mast of a forklift is provided in the embodiment of the present application, which comprises a tooling platform 1, a limiting block 2, a high positioning seat 3, a low positioning seat 4, a positioning angle ruler 5, a pin shaft hole positioning shaft 6, a threaded hole positioning shaft 7, a bushing 8, a spacer sleeve 9, a positioning block 10, a positioning shaft mounting block 11 and a side limiting block 12.

[0059] Figure 2 The structure schematic diagram of the tooling platform 1 is shown, which has five working surfaces in total, i.e., upper, left, right, front and back, and each working surface is distributed with a series of bolt hole, the diameter of which is d. Specifically, the positions of the bolt holes on the upper working surface are determined by the cross grid lines, and the distance between the adjacent bolt holes is l. The positions of the bolt holes on the front, back, left and right working surfaces are determined by two groups of cross grid lines, and the distance between the two groups of grid lines in the horizontal direction is 0.5l. The grid lines on the adjacent working surfaces are perpendicular to each other, and the grid lines on the opposite working surfaces are parallel to each other.

[0060] Figure 3 The structure schematic diagram of the limiting block 2 is shown, which comprises an L-shaped main plate 201, and a long slot hole plate 202, a long round hole plate 203 and a short round hole plate 204 which are vertically connected to the three sides of the L-shaped main plate 201, respectively. The long round hole plate 203 is vertically connected to the long slot hole plate 202 and the short round hole plate 204 at both ends, respectively. The L-shaped main plate 201, the long round hole plate 203 and the short round hole plate 204 are distributed with bolt holes with a diameter of d, and the distance between the bolt holes is 0.5l. The long slot hole plate 202 is provided with a slot hole along its long edge, and the width and length of the slot hole are d and 2l, respectively.

[0061] Figure 4 and Figure 5 Fig. 1 and Fig. 2 respectively show the structural schematic diagram of high positioning seat 3 and low positioning seat 4, both of which are square frame structures, and the lower surface is provided with pin holes with diameter d along the four sides, the distance between the pin holes is an integer multiple of l, and the left and right sides are provided with pin shaft through holes for inserting and installing pin shaft hole positioning shaft 6. The front and rear surfaces of high positioning seat 3 are provided with reinforcing plates.

[0062] Figure 6 Fig. 3 shows the structural schematic diagram of positioning angle ruler 5, which is composed of angle ruler hole plate and angle ruler slot plate connected vertically. The angle ruler hole plate is provided with pin holes with diameter d, and the distance between the pin holes is 0.5l. The angle ruler slot plate is provided with slot holes along the long side, and the width of the slot holes is d and the length is l.

[0063] The slot holes provided in the above components can realize flexible adjustment of the position of the components during use.

[0064] Pin shaft hole positioning shaft 6 is a metal rod, and the diameter is slightly smaller than the diameter of the pin shaft mounting hole of the fixed structure.

[0065] Threaded hole positioning shaft 7 is also a metal rod, and the diameter is slightly smaller than the diameter of the threaded mounting hole of the fixed structure.

[0066] Bushing 8 and spacer 9 are both stepped cylinders, and the outer diameter is equal to the diameter of the pin shaft mounting hole of the fixed structure, and the inner diameter is equal to the diameter of pin shaft hole positioning shaft 6. Spacer 9 is sleeved on pin shaft hole positioning shaft 6, and can be used to position the distance between the two plates.

[0067] Positioning block 10, positioning shaft mounting block 11 and side limiting block 12 are all provided with pin holes with diameter d and distance 0.5l.

[0068] The above-mentioned limiting block 2, high positioning seat 3, low positioning seat 4, positioning angle ruler 5 and side limiting block 12 are connected and fixed with tooling platform 1 through locking pins during use. Limiting block 2, positioning angle ruler 5, positioning block 10, positioning shaft mounting block 11 and side limiting block 12 can also be connected through locking pins.

[0069] In some embodiments, the forklift mast flexible splicing tool further comprises a pad mounted on the upper working surface of the tooling platform 1 for adjusting the fixed height of the mast.

[0070] The following describes the method of splicing and fixing the inner and outer masts by using the above forklift mast flexible splicing tool.

[0071] (I) Splicing and fixing of forklift inner mast

[0072] As Figure 9As shown, the inner mast roller mounting holes at the four corners of the forklift inner mast are fixed. The pin hole positioning shaft 6 is inserted into the low positioning seat 4 and the inner mast roller mounting holes. The pin hole positioning shaft 6 is fixed in the shaft hole by the bushing 8. The low positioning seat 4 is fixed on the tooling platform 1 by the locking pin.

[0073] Assemble the gantry slide rail fixing assembly, fix the limiting block 2 to the tooling platform 1 with locking pins, and fix the positioning block 10 and the limiting block 2 with locking pins to form the gantry slide rail fixing assembly. Use the gantry slide rail fixing assembly to fix the outer side of the inner gantry roller slide rail.

[0074] Assemble the lower crossbeam fixing block of the inner gantry frame, such as Figure 7 As shown, the long slot plate 202 of one limiting block 2 is placed opposite the long oval plate 203 of another limiting block 2 and fixed by locking pins. The upper ends of the two limiting blocks 2 are flush (i.e., the long oval plate 203 of one limiting block 2 and the short oval plate 204 of the other limiting block 2 are flush). The positioning angle ruler 5 is fixed to the outside of the L-shaped main plate 201 of one limiting block 2 by locking pins. The angle ruler hole plate of the positioning angle ruler 5 extends out of the upper ends of the two limiting blocks 2, thus forming the inner frame lower crossbeam fixing block. The upper ends of the two limiting blocks 2 are flush to support the inner frame lower crossbeam. The extended angle ruler hole plate positions the inner frame lower crossbeam. The inner frame lower crossbeam fixing block is fixed to the tooling platform 1 by locking pins.

[0075] The end of the forklift inner mast is abutted by two limiting blocks 2, which are fixed to the tooling platform 1 by locking pins. If the size of the forklift inner mast is too large to be limited by the limiting blocks 2, side limiting blocks 12 can be installed on the side of the tooling platform 1 to limit the end of the forklift inner mast.

[0076] When the dimensions of the forklift mast exceed those of the tooling platform 1, a positioning square 5 can be installed on the side of the tooling platform 1 to expand the working surface of the tooling platform 1.

[0077] (II) Fixing the splice points of the forklift's outer mast

[0078] like Figure 10 As shown, the two outer mast frame mounting holes of the forklift outer mast are fixed. The pin hole positioning shaft 6 is inserted into the high positioning seat 3 and the outer mast frame mounting hole. The pin hole positioning shaft 6 is fixed in the position of the shaft hole by the bushing 8. The spacer 9 is used to fix the distance between the inner and outer support plates of the frame hole. The high positioning seat 3 is fixed on the tooling platform 1 by the locking pin.

[0079] Fix the two outer mast roller mounting holes of the forklift outer mast, insert the pin hole positioning shaft 6 into the low positioning seat 4 and the outer mast roller mounting holes, use the bushing 8 to fix the roller shaft mounting hole pin, and use the locking pin to fix the low positioning seat 4 on the tooling platform 1.

[0080] The assembly type door frame slide fixing assembly fixes the limiting block 2 on the tool platform 1 through the locking pin, and the positioning block 10 and the limiting block 2 are fixed to form the door frame slide fixing assembly through the locking pin, and the inner side of the outer door frame roller slide is fixed by the door frame slide fixing assembly.

[0081] The assembly type threaded hole positioning assembly is composed of the positioning angle ruler 5, the positioning shaft mounting block 11 and the threaded hole positioning shaft 7, the threaded hole positioning shaft 7 is inserted into the outer door frame oil cylinder mounting hole and the chain mounting hole, and the positioning angle ruler 5 is fixed on the tool platform 1 through the locking pin to fix the outer door frame oil cylinder mounting hole and the chain mounting hole.

[0082] The assembly type outer door frame lower cross beam fixing block is composed of the long slot plate 202 of the limiting block 2 and the angle ruler slot plate of the positioning angle ruler 5 through the locking pin, as shown in the figure. Figure 8

[0083] The end of the forklift outer door frame is supported by the two limiting blocks 2 fixed on the tool platform 1 through the locking pin. If the size of the inner door frame of the forklift is large, the end limiting of the limiting block 2 cannot be used, and the side limiting block 12 can be installed on the side of the tool platform 1 to limit the end of the outer door frame of the forklift.

[0084] When the size of the outer door frame of the forklift exceeds the tool platform 1, the positioning angle ruler 5 can be installed on the side of the tool platform 1 to expand the working surface of the tool platform 1.

[0085] In some embodiments, the above-mentioned door frame slide fixing assembly, inner door frame lower cross beam fixing block, threaded hole positioning assembly and outer door frame lower cross beam fixing block can be replaced by an integrated structure instead of an assembly structure.

[0086] In some embodiments, the locking pin used for connection and fixation in the scheme is replaced by a screw, a wedge block and the like.

[0087] The above-mentioned is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any changes or replacement schemes that can be easily thought of by those skilled in the art within the technical range disclosed by the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.​

Claims

1. A flexible splicing tooling for a forklift mast, characterized in that, It includes a tooling platform (1), a limit block (2), a high positioning seat (3), a low positioning seat (4), a positioning angle ruler (5), a pin hole positioning shaft (6), a threaded hole positioning shaft (7), a spacer (9), a positioning block (10), and a positioning shaft mounting block (11); The limiting block (2), the high positioning seat (3), the low positioning seat (4) and the positioning angle ruler (5) can be detachably fixed on the tooling platform (1); The pin hole positioning shaft (6) is used to fix the mast roller mounting hole or the outer mast frame mounting hole. When fixing the mast roller mounting hole, the pin hole positioning shaft (6) is inserted into the low positioning seat (4); when fixing the outer mast frame mounting hole, the pin hole positioning shaft (6) is inserted into the high positioning seat (3); the spacer (9) is fitted on the pin hole positioning shaft (6) and is used to position the distance between the inner and outer support plates of the frame hole. The positioning block (10) is used to position the gantry roller slide. During positioning, the positioning block (10) is detachably fixed on the limiting block (2) to form a gantry slide fixing assembly. The threaded hole positioning shaft (7) is used to fix the external gantry cylinder mounting hole and chain mounting hole. When fixing, the threaded hole positioning shaft (7) is installed on the positioning shaft mounting block (11), and the positioning shaft mounting block (11) is detachably fixed on the positioning angle ruler (5) to form a threaded hole positioning assembly. The limiting block (2) and the positioning angle ruler (5) can be assembled into a fixing block for the lower crossbeam of the gantry, which is used to support the lower crossbeam of the gantry; The limiting block (2) is also used to limit the end of the gantry.

2. The flexible splicing tooling for forklift mast according to claim 1, characterized in that, The tooling platform (1) has a series of pin holes distributed on its upper surface and all four sides; The limiting block (2) includes an L-shaped main board (201), and a long slotted plate (202), an oblong hole plate (203), and a short round hole plate (204) that are vertically connected to the three sides of the L-shaped main board (201); the two ends of the oblong hole plate (203) are vertically connected to the long slotted plate (202) and the short round hole plate (204) respectively; pin holes are distributed on the L-shaped main board (201), the oblong hole plate (203), and the short round hole plate (204); the long slotted plate (202) has a slotted hole along its long side; Both the high positioning seat (3) and the low positioning seat (4) are square frame structures with pin holes distributed on the lower surface and pin through holes for installing the pin hole positioning shaft (6) on the left and right sides. The positioning square (5) includes a square hole plate and a square groove plate that are vertically connected. The square hole plate has pin holes distributed on it, and the square groove plate has a groove-shaped hole along its long side. Both the positioning block (10) and the positioning shaft mounting block (11) are provided with pin holes; The limiting block (2), high positioning seat (3), low positioning seat (4), and positioning angle ruler (5) are connected and fixed to the tooling platform (1) by locking pins; the limiting block (2), positioning angle ruler (5), positioning block (10), and positioning shaft mounting block (11) are also connected to each other by locking pins.

3. The flexible splicing tooling for forklift mast according to claim 2, characterized in that, The diameter of the pin hole on the tooling platform (1) is d; the position of the pin hole on the upper working surface is determined by the cross grid lines, and the distance between adjacent pin holes is l; the positions of the pin holes on the front, back, left and right working surfaces are determined by two sets of cross grid lines, and the distance between the two sets of grid lines in the horizontal direction is 0.5l. The grid lines on adjacent working surfaces are perpendicular to each other, and the grid lines on opposite working surfaces are parallel to each other. The diameter of the pin holes on the L-shaped main board (201), the elongated hole plate (203), and the short hole plate (204) is d, and the distance between the pin holes is 0.5l; the width of the slotted hole on the long slotted hole plate (202) is d, and the length is 2l. The lower surfaces of the high positioning seat (3) and the low positioning seat (4) are provided with pin holes of diameter d along the four sides, and the distance between the pin holes is an integer multiple of l; The diameter of the pin holes on the square hole plate is d, and the distance between the pin holes is 0.5l; the width of the slotted hole on the square groove plate is d, and the length is l. Both the positioning block (10) and the positioning shaft mounting block (11) are provided with pin holes with a diameter of d and a distance of 0.5l.

4. The flexible splicing tooling for forklift mast according to claim 3, characterized in that, It also includes a side limiting block (12), which has a pin hole with a diameter of d and a distance of 0.5l. It is fixed to the side of the tooling platform (1) by a locking pin and is used to limit the gantry.

5. The flexible splicing tooling for forklift mast according to claim 2, characterized in that, It also includes pads for adjusting the fixed height of the gantry.

6. The flexible splicing fixture for forklift masts according to claim 1, characterized in that, The front and rear surfaces of the high positioning seat (3) are provided with reinforcing plates.

7. A method for fixing mast splice points, employing the flexible splice point tooling of a forklift mast as described in any one of claims 2 to 6, characterized in that, This includes securing the forklift's internal mast with splicing points: Fix the inner mast roller mounting holes at the four corners of the inner mast of the forklift, insert the pin hole positioning shaft (6) into the low positioning seat (4) and the inner mast roller mounting holes, and fix the low positioning seat (4) on the tooling platform (1) by locking pin; Assemble the gantry slide rail fixing assembly, fix the limiting block (2) on the tooling platform (1) with locking pins, and fix the positioning block (10) and the limiting block (2) with locking pins to form the gantry slide rail fixing assembly. Use the gantry slide rail fixing assembly to fix the outer side of the inner gantry roller slide rail. Assemble the inner frame lower crossbeam fixing block by placing the long slot plate (202) of one limiting block (2) opposite to the long oval plate (203) of another limiting block (2) and fixing them with locking pins. The upper ends of the two limiting blocks (2) are flush. Fix the positioning angle ruler (5) to the outside of the L-shaped main plate (201) of one limiting block (2) with locking pins. The angle ruler hole plate of the positioning angle ruler (5) extends out of the upper ends of the two limiting blocks (2), thus forming the inner frame lower crossbeam fixing block. The upper ends of the two limiting blocks (2) are flush to support the inner frame lower crossbeam. The extended angle ruler hole plate positions the inner frame lower crossbeam. The inner frame lower crossbeam fixing block is fixed to the tooling platform (1) with locking pins. The end of the forklift inner mast is abutted by two limit blocks (2), which are fixed to the tooling platform (1) by locking pins.

8. The gantry splice fixing method according to claim 7, characterized in that, This also includes splicing and securing the forklift's outer mast: Fix the two outer mast frame mounting holes of the forklift outer mast, insert the pin hole positioning shaft (6) into the high positioning seat (3) and the outer mast frame mounting hole, use the spacer (9) to fix the distance between the inner and outer support plates of the frame hole, and use the locking pin to fix the high positioning seat (3) on the tooling platform (1); Fix the two outer mast roller mounting holes of the forklift outer mast, insert the pin hole positioning shaft (6) into the low positioning seat (4) and the outer mast roller mounting holes, and use the locking pin to fix the low positioning seat (4) on the tooling platform (1); Assemble the gantry slide rail fixing assembly, fix the limiting block (2) on the tooling platform (1) with locking pins, and fix the positioning block (10) and the limiting block (2) with locking pins to form the gantry slide rail fixing assembly. Use the gantry slide rail fixing assembly to fix the inner side of the outer gantry roller slide rail. Assemble the threaded hole positioning assembly, which consists of a positioning angle ruler (5), a positioning shaft mounting block (11), and a threaded hole positioning shaft (7). The threaded hole positioning shaft (7) is inserted into the outer gantry cylinder mounting hole and the chain mounting hole. The positioning angle ruler (5) is fixed to the tooling platform (1) with a locking pin to fix the outer gantry cylinder mounting hole and the chain mounting hole. Assemble the lower crossbeam fixing block of the outer frame by placing the elongated hole plate (203) of a limiting block (2) opposite to the corner plate of a positioning square (5) and fixing them with locking pins to form the lower crossbeam fixing block of the outer frame. The lower crossbeam of the outer frame is supported by the elongated hole plate (202) of the limiting block (2). The forklift's outer mast end is abutted by two limiting blocks (2), which are fixed to the tooling platform (1) by locking pins.

9. The gantry splice fixing method according to claim 7 or 8, characterized in that, If the forklift mast is too large to be limited by the end of the limit block (2), then the side limit block (12) is installed on the side of the tooling platform (1) to limit the end of the forklift mast.

10. The gantry splice fixing method according to claim 7 or 8, characterized in that, When the size of the forklift mast exceeds that of the tooling platform (1), a positioning square (5) is installed on the side of the tooling platform (1) to expand the working surface of the tooling platform (1).

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