Flexible assembly method for crane slewing ring and crane slewing ring assembly method

Abstract

This invention belongs to the field of crane assembly technology and provides a flexible assembly fixture and method for crane turntables. The flexible assembly fixture includes a moving conveying mechanism, a positioning platform, a lifting mechanism, and a side plate positioning mechanism. The moving conveying mechanism includes a guide rail and a moving component. The positioning platform is used to place the turntable onto the moving component and is equipped with a horizontal pad. The lifting mechanism is used to lift the positioning platform from the bottom. The side plate positioning mechanism includes a first positioning pin and a positioning seat. The positioning end of the positioning seat has a first positioning hole, which is used to align with the pin hole on the turntable side plate. The first positioning pin is used to connect the aligned first positioning hole and the pin hole. The position of the pin hole can be adjusted by the lifting mechanism and the moving component, so that the turntable base plate and the turntable side plate only need to be assembled once to ensure the smooth progress of subsequent processes, greatly improving production efficiency and tooling compatibility.

Description

Technical Field

[0001] This invention belongs to the field of crane assembly technology, specifically relating to a flexible assembly tooling for a crane turntable and a method for assembling a crane turntable. Background Technology

[0002] The turntable, one of the three major structural components of a truck crane, serves to connect the chassis and the boom. Existing turntables typically consist of a base plate welded to the chassis and two side plates vertically spaced on the base plate. The pin holes on the side plates are primarily used for pivotal connection with the boom. During turntable assembly, the base plate must be level, and the side plates must have coaxial pin holes. Current assembly methods mainly involve manually assembling the base and side plates, then using a mandrel to connect the positioning holes on the positioning mold and the pin holes on the side plates to achieve coaxial positioning. However, in actual production, due to the large number of crane models and variations in turntable dimensions, and the non-adjustable positioning holes on the positioning mold, the mold must be rearranged every time a product is changed, significantly reducing production efficiency. Summary of the Invention

[0003] To address the aforementioned defects or deficiencies, this invention provides a flexible assembly tooling for crane turntables and a crane turntable assembly method, aiming to solve the technical problem that traditional positioning molds used for turntable assembly are difficult to be compatible with multiple turntable models, resulting in low production efficiency.

[0004] To achieve the above objectives, the present invention provides a flexible assembly fixture for a crane turntable, wherein the flexible assembly fixture for the crane turntable includes a moving conveying mechanism, a positioning platform, a lifting mechanism, and a side plate positioning mechanism. The moving conveying mechanism includes a guide rail extending along a first direction and a moving component slidably disposed on the guide rail. The positioning platform is used to be placed on the moving component and has a horizontal pad on top for placing the turntable base plate. The lifting mechanism is disposed adjacent to the guide rail and is used to lift the positioning platform from the bottom. The side plate positioning mechanism includes a first positioning pin and a positioning seat. The positioning end of the positioning seat extends above the lifting mechanism and has a first positioning hole penetrating along a second direction on the positioning end. The first positioning hole is used to align with the pin hole on the turntable side plate, and the first positioning pin is used to pass through the aligned first positioning hole and the pin hole.

[0005] In an embodiment of the present invention, the positioning platform is provided with a first pressing cylinder and a second pressing cylinder spaced apart along a second direction, and a placement space for placing the turntable base plate is formed between the first pressing cylinder and the second pressing cylinder. The first pressing cylinder and the second pressing cylinder are used to press the edge of the turntable base plate to the reverse deformation position.

[0006] In an embodiment of the present invention, the lifting mechanism includes a first lifting seat and a second lifting seat disposed on both sides of the guide rail. The first lifting seat and the second lifting seat are respectively provided with lifting cylinders, which can extend and retract vertically and are used to lift the positioning platform from the bottom.

[0007] In an embodiment of the present invention, there are multiple lifting cylinders, which are arranged at intervals along a first direction.

[0008] In an embodiment of the present invention, there are two turntable side plates. The positioning seat includes a first positioning part and a second positioning part respectively disposed on both sides of the guide rail. The positioning ends of the first positioning part and the second positioning part are provided with first positioning holes. The first positioning holes on the first positioning part and the second positioning part are aligned in the second direction. The first positioning holes of the first positioning part and the second positioning part are respectively used to align with the pin holes on the two turntable side plates one by one.

[0009] In an embodiment of the present invention, the first positioning pin includes an abutting portion and a through portion that are telescopically connected to each other. A boss is formed between the abutting portion and the through portion. The abutting portion is used to abut against the outer side of the positioning end, and the through portion is used to pass through the first positioning hole and the pin hole for alignment.

[0010] In an embodiment of the present invention, the first positioning pin further includes a bushing portion, which is detachably sleeved on the connecting portion.

[0011] In an embodiment of the present invention, the upper end face of the positioning platform is further provided with a second positioning pin, which is used to be paired and inserted with a second positioning hole on the turntable base plate.

[0012] To achieve the above objectives, the present invention also provides a method for assembling a crane turntable, wherein the crane turntable assembly method includes:

[0013] S10: Provide flexible assembly tooling for the crane turntable as described above;

[0014] S20: Place the positioning platform on the moving part;

[0015] S30: Place the pre-marked turntable base plate on the horizontal pad of the positioning platform in the preset posture, and then place the turntable side plate on the turntable base plate according to the marked position.

[0016] S40: Move the moving part and the lifting mechanism to adjust the position of the turntable base plate and the turntable side plate in the first direction and the vertical direction until the pin hole on the turntable side plate is aligned with the first positioning hole on the positioning seat.

[0017] S50: Use the first locating pin to align the first locating hole and the pin hole, and then weld the turntable side plate.

[0018] In an embodiment of the present invention, the positioning platform is provided with a first clamping cylinder and a second clamping cylinder spaced apart along a second direction. After the turntable base plate is placed on the horizontal pad, the platform further includes:

[0019] S31: Control the first and second clamping cylinders to clamp the edge of the turntable base plate according to the preset parameters, so that the edge of the turntable base plate is clamped and deformed to the reverse deformation position.

[0020] Through the above technical solution, the flexible crane turntable assembly provided in this embodiment of the invention has the following beneficial effects on the tooling:

[0021] When using the flexible assembly tooling for the crane turntable of this invention, the turntable base plate and turntable side plate are first positioned on the positioning platform. Then, the positioning platform is moved in the first direction by a moving component to adjust the position of the pin hole in the first direction. The positioning platform is then lifted by a lifting mechanism to adjust the position of the pin hole in the vertical direction. By adjusting the position of the pin hole, regardless of the size of the turntable base plate and turntable side plate, the flexible assembly tooling for the crane turntable of this invention can ensure that the pin hole and the first positioning hole are aligned in the second direction with only one setup. This not only greatly improves production efficiency, but also allows the flexible assembly tooling for the crane turntable of this invention to be used with turntable base plates and turntable side plates of any size and model, greatly improving the compatibility of the assembly tooling.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0023] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a structural schematic diagram of the crane turntable flexible assembly relative to the tooling from a first-view perspective according to an embodiment of the present invention.

[0025] Figure 2 This is a structural schematic diagram of the crane turntable flexible assembly relative to the tooling from a second perspective according to an embodiment of the present invention.

[0026] Figure 3 This is a structural schematic diagram of the positioning seat from one perspective according to an embodiment of the present invention;

[0027] Figure 4 This is a structural schematic diagram of a crane turntable from one perspective according to an embodiment of the present invention;

[0028] Figure 5This is a flowchart of the steps of the crane turntable assembly method according to an embodiment of the present invention;

[0029] Figure 6 This is a specific step diagram following step S30 in an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures

[0031] 1. Mobile conveyor mechanism; 11. Guide rail

[0032] 12 Moving parts 2 Positioning platform

[0033] 21 Horizontal pad block 22 First clamping cylinder

[0034] 23 Second clamping cylinder 24 Second locating pin

[0035] 3 Lifting Mechanism 31 First Lifting Seat

[0036] 32 Second lifting seat 33 Lifting cylinder

[0037] 4 Side plate positioning mechanism 41 First positioning pin

[0038] 411 Contact part 412 Connecting part

[0039] 413 Bushing section 42 Positioning seat

[0040] 421 Positioning end 422 First positioning hole

[0041] 423 First positioning unit 424 Second positioning unit

[0042] 51 Turntable base plate 52 Turntable side plate

[0043] 53 Pin Hole A, First Direction

[0044] B Second Direction Detailed Implementation

[0045] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0046] The flexible assembly tooling for the crane turntable of the present invention is described below with reference to the accompanying drawings.

[0047] This invention provides a flexible assembly fixture for a crane turntable, such as... Figure 1 , Figure 2 and Figure 4 As shown, the flexible assembly tooling for the crane turntable includes:

[0048] The mobile conveying mechanism 1 includes a guide rail 11 extending along a first direction A and a movable component 12 slidably disposed on the guide rail 11.

[0049] Positioning platform 2 is used to place on the movable component 12 and has a horizontal pad 21 on top for placing the turntable base plate 51.

[0050] Lifting mechanism 3, adjacent to guide rail 11 and used to lift positioning platform 2 from the bottom; and

[0051] The side plate positioning mechanism 4 includes a first positioning pin 41 and a positioning seat 42. The positioning end 421 of the positioning seat 42 extends above the lifting mechanism 3. The positioning end 421 is provided with a first positioning hole 422 that passes through along the second direction B. The first positioning hole 422 is used to align with the pin hole 53 on the turntable side plate 52. The first positioning pin 41 is used to pass through the aligned first positioning hole 422 and the pin hole 53.

[0052] When using the flexible crane turntable assembly tooling of this invention, the positioning platform 2, turntable base plate 51, and turntable side plate 52 are first positioned on the positioning platform 2. Then, the moving component 12 drives the positioning platform 2 to move in the first direction A to adjust the position of the pin hole 53 in the first direction A. The lifting mechanism 3 lifts the positioning platform 2 to adjust the position of the pin hole 53 in the vertical direction. By adjusting the position of the pin hole 53, regardless of the changes in the dimensions of the turntable base plate 51 and the turntable side plate 52, the flexible crane turntable assembly tooling of this invention can achieve alignment of the pin hole 53 with the first positioning hole 422 in the second direction B. After alignment, the pin hole 53 and the first positioning hole 422 only need to be connected by the first positioning pin 41 to complete coaxial positioning.

[0053] Specifically, when a product model is changed, due to the size differences of different turntable models, if the turntable base plate 51 and turntable side plate 52 are directly assembled without changing the assembly tooling, the pin hole 53 may not be able to align with the first positioning hole 422 on the positioning seat 42. Rearranging the assembly tooling would consume a significant amount of production time, leading to reduced production efficiency. This invention, by setting up the moving part 12 and the lifting mechanism 3, can accommodate turntable base plates 51 and turntable side plates 52 of different sizes. That is, when assembling the turntable base plate 51 and turntable side plate 52, there is no need to consider their dimensions; simply align the turntable base plate 51 and turntable side plate 52 correctly on the positioning platform 2, and then move the pin hole 53 on the turntable side plate 52 through the driving of the moving part 12 and the lifting mechanism 3. In summary, the flexible assembly tooling for the crane turntable in this invention only requires one setup for any size turntable base plate 51 and turntable side plate 52 to ensure the smooth progress of subsequent processes, which not only greatly improves production efficiency but also greatly enhances the compatibility of the assembly tooling.

[0054] like Figure 1 and Figure 2 As shown, in this embodiment of the invention, there are two guide rails 11, which are arranged parallel to each other in the second direction B. Each guide rail 11 is provided with at least two moving parts 12. By providing at least four moving parts 12, the positioning platform 2 can be stably supported. Since the moving parts 12 can only move along the first direction A, and the first positioning hole 422 always extends along the second direction B, and the turntable base plate 51 is generally placed with a certain position or a certain reference surface of the positioning platform 2 as a reference, in order to ensure the placement posture of the turntable base plate 51, it is usually necessary to ensure that the positioning platform 2 is placed on the moving parts 12 in the same preset posture each time. There are many ways to ensure the placement posture of the positioning platform 2 each time, such as providing a pin seat on the moving part 12 and then providing a pin hole at the bottom of the positioning platform 2, or providing a stop edge extending along the first direction A on the moving part 12, etc. The aforementioned proper placement specifically refers to the centerline of the turntable base plate 51 being parallel to the first direction A, and the pin hole 53 of the turntable side plate 52 being parallel to the second direction B. This ensures that by adjusting the position of the pin hole 53 in the first direction A and the vertical direction, alignment with the first positioning hole 422 can be achieved. The aforementioned moving component 12 can be an AGV transport vehicle, or a slider pulled by a wire rope, etc.

[0055] like Figure 1As shown, in an embodiment of the present invention, the positioning platform 2 is provided with a first clamping cylinder 22 and a second clamping cylinder 23 spaced apart along the second direction B. A placement space for placing the turntable base plate 51 is formed between the first clamping cylinder 22 and the second clamping cylinder 23. The first clamping cylinder 22 and the second clamping cylinder 23 are used to press the edge of the turntable base plate 51 to the anti-deformation position. After the turntable base plate 51 and the turntable side plate 52 are placed and coaxially positioned, the turntable base plate 51 and the turntable side plate 52 need to be welded. During the welding process, the turntable base plate 51 is easily deformed by heat, making it difficult to ensure the levelness of the turntable base plate 51. The present invention, by setting the first clamping cylinder 22 and the second clamping cylinder 23 to press the edge of the turntable base plate 51 to the anti-deformation position, can ensure the levelness of the turntable base plate 51 after the turntable base plate 51 and the turntable side plate 52 are welded. It should be noted that the purpose of setting the horizontal pad 21 is twofold: firstly, to ensure the horizontality of the turntable base plate 51, and secondly, to facilitate the first clamping cylinder 22 and the second clamping cylinder 23 in clamping the edges of the turntable base plate 51.

[0056] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the lifting mechanism 3 includes a first lifting seat 31 and a second lifting seat 32 respectively disposed on both sides of the guide rail 11. The first lifting seat 31 and the second lifting seat 32 are respectively provided with lifting cylinders 33, which can extend and retract vertically and are used to lift the positioning platform 2 from the bottom. Specifically, there are two guide rails 11. The first lifting seat 31 and the second lifting seat 32 are arranged adjacent to the two guide rails 11 in a one-to-one correspondence, and their centers of symmetry coincide with the centers of symmetry of the two guide rails 11. By providing the first lifting seat 31 and the second lifting seat 32, the positioning platform 2 can be lifted from both sides, thereby increasing the stability of the lifting of the positioning platform 2.

[0057] like Figure 1 As shown, in this embodiment of the invention, there are multiple lifting cylinders 33, which are arranged at intervals along the first direction A. When adjusting the position of the pin hole 53, the positioning platform 2 is first moved along the first direction A by the moving part 12. After the positioning platform 2 moves to a suitable position in the first direction A, the lifting cylinders 33 are then controlled to lift the positioning platform 2; that is, the two movements are performed step-by-step. For different models of turntables, the stopping position of the positioning platform 2 in the first direction A will differ. By arranging multiple cylinders at intervals along the first direction A, the positioning platform 2, regardless of its position, can be lifted by the lifting cylinders 33.

[0058] like Figure 1 , Figure 2 and Figure 4As shown, in this embodiment of the invention, there are two turntable side plates 52. The positioning seat 42 includes a first positioning part 423 and a second positioning part 424 respectively disposed on both sides of the guide rail 11. The positioning ends 421 of the first positioning part 423 and the second positioning part 424 are provided with first positioning holes 422. The first positioning holes 422 on the first positioning part 423 and the second positioning part 424 are aligned in the second direction B. The first positioning holes 422 of the first positioning part 423 and the second positioning part 424 are respectively used to align with the pin holes 53 on the two turntable side plates 52. When the pin holes 53 on the two turntable side plates 52 are coaxially positioned, since the coaxiality positioning is based on the fact that the diameter of the first positioning pin 41 is the same as that of the first positioning hole 422 and the pin hole 53, there will inevitably be machining accuracy errors in the holes or shafts during actual processing. If a single pin is used to continuously connect the first positioning hole 422 and the two pin holes 53, the influence of machining accuracy errors may make it difficult to connect and disassemble the pin. Therefore, in this invention, the first positioning part 423 and the second positioning part 424 are used to coaxially position the pin holes 53 on the two turntable side plates 52, which makes it more convenient for workers to operate. It should be particularly emphasized that the first positioning hole 422 is a precision-machined hole, and the first positioning part 423 and the second positioning part 424 need to be aligned in the second direction B when they are arranged.

[0059] like Figure 1 , Figure 2 and Figure 4 As shown, in an embodiment of the present invention, the first positioning pin 41 includes an abutment portion 411 and a through portion 412 that are telescopically connected to each other. A boss is formed between the abutment portion 411 and the through portion 412. The abutment portion 411 abuts against the outer side of the positioning end 421, and the through portion 412 is used to pass through the first positioning hole 422 and the pin hole 53 for alignment. In existing processes, the pin insertion and removal generally require the worker to strike it. However, in this application, the abutment portion 411 is fixed to the outer side of the positioning end 421 as a force-bearing component. By controlling the extension of the through portion 412 to pass through the first positioning hole 422 and the pin hole 53 on the corresponding side, coaxiality positioning can be easily achieved. After coaxiality positioning is completed, the turntable side plate 52 is welded to the turntable base plate 51, and then the retraction of the through portion 412 is controlled to complete the assembly of the turntable. In summary, by telescopically setting the first positioning pin 41, worker operation is facilitated.

[0060] like Figure 2 , Figure 3 and Figure 4As shown, in an embodiment of the present invention, the first positioning pin 41 further includes a bushing portion 413, which is detachably sleeved on the connecting portion 412. Specifically, there are multiple first positioning holes 422, and the diameters of the different first positioning holes 422 vary. Since the diameter of the pin hole 53 changes with the model of the turntable side plate 52, and the basis for achieving coaxiality positioning is that the diameter of the first positioning pin 41 is the same as the diameters of the first positioning holes 422 and the pin hole 53. Therefore, to solve the compatibility problem of coaxiality positioning, multiple first positioning holes 422 with different diameters can be set and one of them can be aligned with the pin hole 53, and the diameter of the first positioning pin 41 can be adjusted by sleeved with bushing portions 413 of different sizes on the connecting portion 412.

[0061] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the upper end face of the positioning platform 2 is further provided with a second positioning pin 24, which is used to mate and insert with the second positioning hole on the turntable base plate 51. Specifically, the turntable base plate 51 is generally machined with a second positioning hole during processing, and by setting the corresponding second positioning pin 24 on the positioning platform 2, the turntable base plate 51 can be quickly placed into position.

[0062] like Figure 1 , Figure 4 and Figure 5 As shown, to achieve the above objectives, the present invention also provides a method for assembling a crane turntable, wherein the crane turntable assembly method includes:

[0063] S10: Provide flexible assembly tooling for the crane turntable as described above;

[0064] S20: Place the positioning platform 2 on the moving part 12;

[0065] S30: Place the pre-marked turntable base plate 51 on the horizontal pad 21 of the positioning platform 2 in the preset posture, and then place the turntable side plate 52 on the turntable base plate 51 according to the marked position.

[0066] S40: Move the moving part 12 and the lifting mechanism 3 to adjust the position of the turntable base plate 51 and the turntable side plate 52 in the first direction A and the vertical direction, until the pin hole 53 on the turntable side plate 52 is aligned with the first positioning hole 422 on the positioning seat 42.

[0067] S50: Use the first positioning pin 41 to connect the aligned first positioning hole 422 and pin hole 53, and then weld the turntable side plate 52.

[0068] The aforementioned placement of the positioning platform 2 on the moving part 12 specifically refers to placing the positioning platform 2 on the moving part 12 in a preset posture. The method for ensuring the placement posture of the positioning platform 2 has already been described in detail and will not be repeated here. Pre-marking refers to pre-drawing the center line position and the placement position of the turntable side plates 52 on the turntable base plate 51. Since there are two turntable side plates 52, there are also two placement positions on the turntable base plate 51, symmetrically distributed along the center line. The placement posture of the turntable base plate 51 can be ensured using the second positioning pin 24 and the second positioning hole. Alternatively, a reference line can be drawn on the positioning platform 2, and then manually compared and corrected to the center line. After the turntable base plate 51 and turntable side plates 52 are in place, the moving part 12 and the lifting mechanism 3 are moved according to the distance difference between the pin hole 53 and the first positioning hole 422 until the pin hole 53 is aligned with the first positioning hole 422.

[0069] like Figure 1 and Figure 6 As shown, in an embodiment of the present invention, the positioning platform 2 is provided with a first clamping cylinder 22 and a second clamping cylinder 23 spaced apart along the second direction B. After the turntable base plate 51 is placed on the horizontal pad 21, it further includes:

[0070] S31: Control the first clamping cylinder 22 and the second clamping cylinder 23 to clamp the edge of the turntable base plate 51 according to the preset parameters, so that the edge of the turntable base plate 51 is clamped and deformed to the reverse deformation position.

[0071] By adding a reverse deformation pressing process, the welding heat deformation of the turntable base plate 51 can be compensated, thereby ensuring the levelness of the turntable base plate 51 after welding.

[0072] In embodiments of the present invention, the flexible assembly tooling for the crane turntable can also be used in conjunction with other mechanisms to realize a complete automatic turntable assembly production line. For example, the lifting mechanism 3 and the side plate positioning mechanism 4 are arranged downstream of the guide rail 11, and then an automatic hoisting mechanism and an automatic positioning and correction mechanism are arranged upstream of the guide rail 11 to realize the automatic placement and positioning of the positioning platform 2 and the turntable side plate 52. The automatic hoisting mechanism can be a program-controlled mechanical boom, and the automatic positioning and correction mechanism can be a centering and pushing hydraulic cylinder.

[0073] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flexible assembly tooling for a crane turntable, characterized in that, The flexible assembly tooling for the crane turntable includes: The mobile conveying mechanism (1) includes a guide rail (11) extending along a first direction (A) and a movable member (12) slidably disposed on the guide rail (11). The positioning platform (2) is used to be placed on the movable part (12) and has a horizontal pad (21) on top for supporting the turntable base plate (51). A lifting mechanism (3) is disposed adjacent to the guide rail (11) and is used to lift the positioning platform (2) from the bottom; and The side plate positioning mechanism (4) includes a first positioning pin (41) and a positioning seat (42). The positioning end (421) of the positioning seat (42) extends above the lifting mechanism (3). The positioning end (421) is provided with a first positioning hole (422) that passes through along the second direction (B). The first positioning hole (422) is used to align with the pin hole (53) on the turntable side plate (52). The first positioning pin (41) is used to pass through the aligned first positioning hole (422) and the pin hole (53). The positioning platform (2) is provided with a first pressing cylinder (22) and a second pressing cylinder (23) spaced apart along the second direction (B). A placement space for placing the turntable base plate (51) is formed between the first pressing cylinder (22) and the second pressing cylinder (23). The first pressing cylinder (22) and the second pressing cylinder (23) are used to press the edge of the turntable base plate (51) to the reverse deformation position.

2. The flexible assembly tooling for the crane turntable according to claim 1, characterized in that, The lifting mechanism (3) includes a first lifting seat (31) and a second lifting seat (32) respectively disposed on both sides of the guide rail (11). The first lifting seat (31) and the second lifting seat (32) are respectively provided with lifting cylinders (33). The lifting cylinders (33) can extend and retract vertically and are used to lift the positioning platform (2) from the bottom.

3. The flexible assembly tooling for the crane turntable according to claim 2, characterized in that, The number of lifting cylinders (33) is multiple, and the multiple lifting cylinders (33) are arranged at intervals along the first direction (A).

4. The flexible assembly tooling for the crane turntable according to claim 1, characterized in that, The number of turntable side plates (52) is two. The positioning seat (42) includes a first positioning part (423) and a second positioning part (424) respectively disposed on both sides of the guide rail (11). The positioning end (421) of the first positioning part (423) and the second positioning part (424) are provided with the first positioning hole (422). The first positioning hole (422) on the first positioning part (423) and the second positioning part (424) are aligned in the second direction (B). The first positioning hole (422) on the first positioning part (423) and the second positioning part (424) are respectively used to align with the pin hole (53) on the two turntable side plates.

5. The flexible assembly tooling for the crane turntable according to claim 1, characterized in that, The first positioning pin (41) includes an abutment portion (411) and a through portion (412) that are telescopically connected to each other. A boss is formed between the abutment portion (411) and the through portion (412). The abutment portion (411) is used to abut against the outside of the positioning end (421). The through portion (412) is used to pass through the first positioning hole (422) and the pin hole (53) that are aligned.

6. The flexible assembly tooling for the crane turntable according to claim 5, characterized in that, The first positioning pin (41) also includes a bushing (413), which is detachably sleeved on the connecting part (412).

7. The flexible assembly tooling for a crane turntable according to any one of claims 1 to 6, characterized in that, The upper end face of the positioning platform (2) is also provided with a second positioning pin (24), which is used to be paired and inserted with the second positioning hole on the turntable base plate (51).

8. A method for assembling a crane turntable, characterized in that, The crane turntable assembly method includes: Provide a flexible assembly tooling for a crane turntable according to any one of claims 1 to 7; Place the positioning platform (2) on the movable part (12); Place the pre-marked turntable base plate (51) on the horizontal pad (21) of the positioning platform (2) in the preset posture, and then place the turntable side plate (52) on the turntable base plate (51) according to the marked position; Move the moving part (12) and the lifting mechanism (3) to adjust the position of the turntable base plate (51) and the turntable side plate (52) in the first direction (A) and the vertical direction until the pin hole on the turntable side plate (52) is aligned with the first positioning hole (422) on the positioning seat (42); The first positioning pin (41) is used to connect the aligned first positioning hole (422) and the pin hole (53), and then the turntable side plate (52) is welded. The positioning platform (2) is provided with a first clamping cylinder (22) and a second clamping cylinder (23) spaced apart along the second direction (B). After the turntable base plate (51) is placed on the horizontal pad (21), it further includes: According to preset parameters, the first pressing cylinder (22) and the second pressing cylinder (23) are controlled to press the edge of the turntable base plate (51) so that the edge of the turntable base plate (51) is pressed and deformed to the reverse deformation position.

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