Limiting structure for tool turnover unit and tool turnover unit

Abstract

The utility model provides a limit structure for frock turnover unit and frock turnover unit.The limit structure for frock turnover unit comprises a movable part which is installed at the bottom of a connecting arm, the movable part synchronously moves along with the connecting arm, the movable part comprises a first limit block and a second limit block, the first limit block forms a first limit groove, and the second limit block forms a second limit groove. A second limiting groove is formed in the second limiting block; the fixing part is installed on the top of a base of the tool overturning unit, the fixing part comprises a first limiting plate part and a second limiting plate part which are perpendicular to each other, a first limiting protrusion is formed on the first limiting plate part, and a second limiting protrusion is formed on the second limiting plate part; and under the condition that the movable part is jointed with the fixed part, the first limiting bulge is clamped in the first limiting groove, and the second limiting bulge is clamped in the second limiting groove. According to the limiting structure for the tool overturning unit and the tool overturning unit, the problem that the repeated positioning precision cannot be guaranteed due to the fact that the tool overturning unit is prone to shaking can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of large-scale turning units, and in particular to a limiting structure for a tool turning unit and a tool turning unit. Background Art

[0002] At the front longitudinal beam assembly welding station, the secondary loading part of the tooling fixture is the front upper longitudinal beam outer panel assembly, and its main locating pin is the telescopic locating pin on the tooling flip unit.

[0003] Since the tooling flip unit is large in size and has a long vertical extension, the center of gravity of the tooling flip unit is biased upward, and its overall structure is prone to shaking. As a result, the accuracy of repeated positioning of the tooling flip unit cannot be guaranteed, the size of the produced parts is unstable, and there is a risk of producing defective products. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a limit structure for a tooling turning unit and a tooling turning unit, so as to solve the problem that the tooling turning unit is prone to shaking, resulting in the accuracy of repeated positioning not being guaranteed.

[0005] According to the first aspect of the utility model, a limiting structure for a tooling flip unit is provided, wherein the limiting structure for the tooling flip unit comprises: a movable part, which is installed at the bottom of the connecting arm of the tooling flip unit, and the movable part moves synchronously with the connecting arm, and the movable part comprises a first limiting block and a second limiting block, and the first limiting block is formed with a first limiting groove, and the second limiting block is formed with a second limiting groove; and a fixed part, which is installed at the top of the base of the tooling flip unit, and the fixed part comprises a first limiting plate part and a second limiting plate part which are perpendicular to each other, and the first limiting plate part is formed with a first limiting protrusion, and the second limiting plate part is formed with a second limiting protrusion; when the movable part moves to engage with the fixed part, the first limiting protrusion is clamped in the first limiting groove, and the second limiting protrusion is clamped in the second limiting groove.

[0006] Preferably, the first limiting plate portion is horizontally arranged on the top of the base, and the second limiting plate portion is vertically arranged at the end of the first limiting plate portion away from the connecting arm.

[0007] Preferably, the first limiting protrusion and the second limiting protrusion are formed as strip-shaped protrusions, the first limiting protrusion is formed on the side of the first limiting plate portion close to the second limiting plate portion, the second limiting protrusion is formed on the side of the second limiting plate portion close to the first limiting plate portion, and the length direction of the first limiting protrusion is perpendicular to the length direction of the second limiting protrusion.

[0008] Preferably, the first limiting block is connected to the second limiting block, the first limiting groove and the second limiting groove are formed as strip grooves, the length direction of the first limiting groove is perpendicular to the length direction of the second limiting groove, and the first limiting groove is connected to the second limiting groove.

[0009] Preferably, a pressure relief groove is also formed at the connection between the first limiting groove and the second limiting groove, and the pressure relief groove is recessed toward the interior of the movable part, so that when the movable part moves to engage with the fixed part, a cavity for reducing air pressure is formed between the movable part and the fixed part.

[0010] Preferably, the movable portion is chamfered at a connection position corresponding to the first limiting plate portion and the second limiting plate portion.

[0011] According to the second aspect of the utility model, a tooling flip unit is provided, wherein the tooling flip unit includes a base, a connecting arm and a limiting structure for the tooling flip unit as described above, the bottom of the connecting arm and the top of the base are pivotally connected via a hinge, and the limiting structure for the tooling flip unit is arranged between the connecting arm and the base.

[0012] Preferably, a first groove is formed at the bottom of the first limiting plate portion, the top portion of the base is clamped in the first groove, and the first limiting plate portion is connected to the top of the base via a threaded connector.

[0013] Preferably, a second groove is formed on the top of the first limiting block, the bottom portion of the connecting arm is clamped in the second groove, and the first limiting block is connected to the bottom of the connecting arm via a threaded connector.

[0014] Preferably, the tooling flipping unit also includes: a first-level flipping cylinder, connected to the side of the base, the piston rod of the first-level flipping cylinder is hinged to the first end of the bottom of the connecting arm, the movable part is arranged at the second end of the bottom of the connecting arm, and the first-level flipping cylinder is used to drive the connecting arm to pivot around the hinge part; a telescopic cylinder, arranged at the upper part of the connecting arm, the telescopic cylinder is connected to the telescopic positioning pin; and a second-level flipping cylinder, installed on the upper part of the connecting arm.

[0015] The limit structure and the tooling turning unit of the utility model embodiment are installed at the bottom of the connecting arm of the tooling turning unit, and the movable part moves synchronously with the connecting arm. The movable part includes a first limit block and a second limit block, the first limit block is formed with a first limit groove, and the second limit block is formed with a second limit groove. The fixed part is installed on the top of the base of the tooling turning unit, and the fixed part includes a first limit plate part and a second limit plate part perpendicular to each other, the first limit plate part is formed with a first limit protrusion, and the second limit plate part is formed with a second limit protrusion. When the movable part moves to engage with the fixed part, the first limiting protrusion can be clamped in the first limiting groove, and the second limiting protrusion can be clamped in the second limiting groove, so that the connecting arm and the base have limitations in multiple directions at the same time, and the first limiting plate part is perpendicular to the second limiting plate part, so that the connecting arm can be limited by the limiting block and the limiting groove on both side surfaces that are perpendicular to each other, which greatly enhances the stability of the connecting arm and avoids the shaking of the telescopic positioning pin. In this way, the problem that the tooling flip unit is prone to shaking, resulting in the problem that the accuracy of repeated positioning cannot be guaranteed, can be effectively solved.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of a tooling turning unit according to the utility model.

[0019] Figure 2 yes Figure 1 Schematic diagram of part A.

[0020] Figure 3 It is a schematic diagram of a limiting structure for a tooling turning unit according to the utility model.

[0021] Figure 4 It is a schematic diagram of the fixing part of the limiting structure for the tooling turning unit according to the utility model.

[0022] Figure 5 It is a schematic diagram of the movable part of the limiting structure for the tooling turning unit according to the utility model.

[0023] Figure markings: 1-movable part; 11-first limiting block; 110-first limiting groove; 111-second groove; 12-second limiting block; 120-second limiting groove; 130-pressure relief groove; 2-fixed part; 20-chamfer; 21-first limiting plate part; 210-first limiting protrusion; 211-first groove; 22-second limiting plate part; 220-second limiting protrusion; 3-tool turning unit; 31-connecting arm; 32-base; 33-limiting structure for tool turning unit; 34-first turning cylinder; 340-piston rod; 35-telescopic cylinder; 36-second turning cylinder; 37-buffer; 4-hinged part. DETAILED DESCRIPTION

[0024] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0025] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0026] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0027] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0028] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0029] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0030] The terms used herein are only used to describe various examples and are not used to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprising" and "having" list the existence of the stated features, quantities, operations, components, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0031] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0032] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0033] like Figures 1 to 5 As shown, according to a first aspect of the utility model, a limiting structure for a tooling turning unit is provided. The limiting structure for the tooling turning unit includes a movable part 1 and a fixed part 2.

[0034] In the following description, reference will be made to Figures 1 to 5 The specific structure of the above components of the limiting structure for the tooling turning unit and the connection relationship of the above components are specifically described.

[0035] like Figures 1 to 5 As shown, in an embodiment, the movable part 1 can be installed at the bottom of the connecting arm 31 of the tooling flip unit 3. The movable part 1 can move synchronously with the connecting arm 31. The movable part 1 can include a first limit block 11 and a second limit block 12. The first limit block 11 can be formed with a first limit groove 110, and the second limit block 12 can be formed with a second limit groove 120. The fixed part 2 can be installed on the top of the base 32 of the tooling flip unit 3. The fixed part 2 can include a first limit plate part 21 and a second limit plate part 22 that are perpendicular to each other. The first limit plate part 21 can be formed with a first limit protrusion 210, and the second limit plate part 22 can be formed with a second limit protrusion 220. In this way, when the movable part 1 moves to engage with the fixed part 2 (that is, when the movable part 1 is connected and spliced ​​with the fixed part 2), the first limit protrusion 210 can be clamped in the first limit groove 110, and the second limit protrusion 220 can be clamped in the second limit groove 120. In this case, the connection arm 31 and the base 32 are limited in multiple directions at the same time. And because the first limit plate portion 21 is perpendicular to the second limit plate portion 22, the connection arm 31 can be limited on two perpendicular sides by the limit blocks and the limit grooves to prevent the connection arm 31 from shaking.

[0036] Preferably, Figures 1 to 5 As shown, the first limit plate portion 21 can be horizontally arranged on the top of the base 32. The second limit plate portion 22 can be vertically arranged at the end of the first limit plate portion 21 away from the connecting arm 31. Specifically, the second limit plate portion 22 can be integrally formed with the first limit plate portion 21. In the embodiment, when the connecting arm 31 pivots to the limit position, the connecting arm 31 stands vertically (since the overall shape of the connecting arm 31 is relatively curved, it can be considered that when the overall extension direction of the connecting arm 31 is along the vertical direction, the connecting arm 31 is in a vertically standing state, that is, it can be as shown in the figure). Figure 1 In this case, the tooling turning unit 3 is relatively long in the vertical direction, about 525 mm. Other components for realizing the positioning function are also installed at the top of the connecting arm 31, which causes the center of gravity of the tooling turning unit 3 to be biased upward, making the connecting arm 31 prone to shaking.

[0037] In this case, after the first limiting plate portion 21 is horizontally set on the top of the base 32, the movable part 1 is limited by the first limiting plate portion 21 in multiple directions on the horizontal plane, thereby reducing the shaking of the connecting arm 31. The second limiting plate portion 22 is vertically set at the end of the first limiting plate portion 21, which can reduce the shaking of the connecting arm 31 in the pivoting direction and play the role of supporting the connecting arm 31. In addition, the second limiting plate portion 22 is vertically set, which can also play the role of limiting the movable part 1 on the vertical plane. The second limiting plate portion 22 further limits the movement of the movable part 1 in the horizontal direction. The second limiting plate portion 22 cooperates with the first limiting plate portion 21 to limit the movable part 1 on two perpendicular planes at the same time, and indirectly limits the connecting arm 31 connected to the movable part 1, which can effectively improve the stability of the connecting arm 31.

[0038] However, it is not limited to this. The setting of integrally forming the second limiting plate portion 22 and the first limiting plate portion 21 is only a preferred situation in the embodiment. As long as it can play the function of limiting the shaking of the connecting arm 31, the second limiting plate portion 22 and the first limiting plate portion 21 can also be set to other situations. For example, the second limiting plate portion can be set separately from the first limiting plate portion, and the second limiting plate portion and the first limiting plate portion can still be perpendicular to each other but not connected. Specifically, a bracket can be set on the side of the first limiting plate portion away from the connecting arm, and the second limiting plate portion can be vertically installed on the bracket. Such a setting can still achieve the limitation of the movable part on two perpendicular planes at the same time.

[0039] Preferably, Figure 3 and Figure 4 As shown, in an embodiment, the first limiting protrusion 210 and the second limiting protrusion 220 can be formed as strip-shaped protrusions. Specifically, the cross-section of the protrusion can be rectangular, and the widths of the first limiting protrusion 210 and the second limiting protrusion 220 can be equal. The extension direction of the first limiting protrusion 210 can be parallel to the length direction of the first limiting plate portion 21, and the extension direction of the second limiting protrusion 220 can be parallel to the length direction of the second limiting plate portion 22. So that the length direction of the first limiting protrusion 210 is perpendicular to the length direction of the second limiting protrusion 220. Preferably, the first limiting protrusion 210 can be formed in the center of the side of the first limiting plate portion 21 close to the second limiting plate portion 22. The second limiting protrusion 220 can be formed in the center of the side of the second limiting plate portion 22 close to the first limiting plate portion 21. That is, the first limiting plate portion 21 and the second limiting plate portion 22 can form an L shape together, and the first limiting protrusion 210 and the second limiting protrusion 220 are both formed on the inner side of the L shape. Such a configuration makes it easy for the movable part 1 to be engaged with the first limiting protrusion 210 and the second limiting protrusion 220 at the same time, thereby improving the stability of the connecting arm 31.

[0040] Further, preferably, Figures 3 to 5 As shown, in an embodiment, the first limit block 11 can be connected to the second limit block 12. Specifically, the first limit block 11 and the second limit block 12 can be formed into a strip. The second limit block 12 can be arranged at the end of the first limit block 11. The length direction of the second limit block 12 can be perpendicular to the length direction of the first limit block 11, and the second limit block 12 can be integrally formed with the first limit block 11. Not limited to this, the second limit block 12 and the first limit block 11 are integrally formed only in one embodiment, and other situations can also be formed in actual use. For example: the second limit block is separately arranged from the first limit block, and the two are respectively fixed on two perpendicular sides of the bottom of the connecting arm. In this case, the length directions of the second limit block and the first limit block can still be perpendicular to each other. Since there is space between the second limit block and the first limit block, the air pressure generated by the movable part and the fixed part during the joining process can be reduced.

[0041] In addition, preferably, the first limiting groove 110 and the second limiting groove 120 can both be formed as strip grooves. Specifically, the first limiting groove 110 and the second limiting groove 120 can be formed on the side of the movable part 1 close to the fixed part 2. The first limiting groove 110 can penetrate the first limiting block 11 along the length direction of the first limiting block 11. The second limiting groove 120 can penetrate the second limiting block 12 along the length direction of the second limiting block 12. The length direction of the first limiting groove 110 is perpendicular to the length direction of the second limiting groove 120. Preferably, the first limiting groove 110 can be connected to the second limiting groove 120, that is, the end of the first limiting groove 110 is connected to the end of the second limiting groove 120. The cross-sections of the first limiting groove 110 and the second limiting groove 120 can also be rectangular, so as to be easily engaged with the first limiting protrusion 210 and the second limiting protrusion 220.

[0042] More preferably, Figure 5 As shown, in an embodiment, a pressure relief groove 130 may be formed at the connection between the first limiting groove 110 and the second limiting groove 120. Specifically, the pressure relief groove 130 may be recessed into the interior of the movable part 1, and the pressure relief groove 130 may form a stepped shape with the first limiting groove 110 and the second limiting groove 120. When the movable part 1 moves to engage with the fixed part 2, the first limiting protrusion 210 and the second limiting protrusion 220 will not contact the inner wall surface of the pressure relief groove 130. A cavity is formed between the movable part 1 and the fixed part 2. In this way, the air pressure generated during the engagement process between the movable part 1 and the fixed part 2 can be effectively reduced to facilitate the engagement of the two.

[0043] In addition, preferably, Figure 3 and Figure 5As shown, in the embodiment, the movable part 1 may be formed with a chamfer 20 at the connection between the first limiting plate part 21 and the second limiting plate part 22. Since the first limiting plate part 21 and the second limiting plate part 22 are perpendicular to each other, the connection between the two forms a right angle. Therefore, the movable part 1 may be formed with a chamfer 20 at the corresponding right angle to avoid collision during the joining process. In addition, such a setting is conducive to reducing the air pressure generated during the joining process between the movable part 1 and the fixed part 2.

[0044] In addition, if Figures 1 to 5 As shown, according to the second aspect of the utility model, a tool turning unit is provided, the tool turning unit comprising a connecting arm 31, a base 32 and a limiting structure 33 for the tool turning unit as described above. The bottom of the connecting arm 31 and the top of the base 32 can be pivotally connected through a hinge 4. The limiting structure 33 for the tool turning unit can be arranged between the connecting arm 31 and the base 32.

[0045] Preferably, Figures 2 to 5 As shown, in the embodiment, a first groove 211 may be formed at the bottom of the first limit plate portion 21. The top of the base 32 may be partially stuck in the first groove 211. The first limit plate portion 21 may be connected to the top of the base 32 via a threaded connector. Specifically, a countersunk hole may be provided on the first limit plate portion 21, and the first limit plate portion 21 and the base 32 are connected via a countersunk screw to avoid obstruction to the engagement of the movable portion 1 and the fixed portion 2.

[0046] Preferably, a second groove 111 may be formed on the top of the first limit block 11. The bottom of the connecting arm 31 may be partially stuck in the second groove 111. The first limit block 11 may be connected to the bottom of the connecting arm 31 through a threaded connector. Specifically, a countersunk hole may be provided on the first limit block 11, and the first limit block 11 and the connecting arm 31 are connected by a countersunk screw to avoid obstruction to the engagement of the movable part 1 and the fixed part 2.

[0047] Preferably, Figure 1 and Figure 2 As shown, in the embodiment, the tooling turning unit 3 may further include a primary turning cylinder 34, a telescopic cylinder 35, and a secondary turning cylinder 36. The primary turning cylinder 34 may be bolted to the side of the base 32. The primary turning cylinder 34 may be arranged vertically. The piston rod 340 of the primary turning cylinder 34 may be connected to the first end of the bottom of the connecting arm 31 (which may be a telescopic cylinder 35). Figure 2 The movable part 1 can be arranged at the second end of the bottom of the connecting arm 31 (which can be as shown in FIG. Figure 2The hinged portion 4 can be disposed between the first end and the second end of the connecting arm 31, so that when the primary flipping cylinder 34 extends or retracts the piston rod 340, the piston rod 340 can drive the connecting arm 31 to pivot around the hinged portion 4 (i.e., drive the primary flipping mechanism to flip), thereby moving the movable portion 1 to engage with the fixed portion 2.

[0048] Preferably, a buffer 37 can also be installed between the base 32 and the bottom of the connecting arm 31 to prevent the connecting arm 31 from stopping suddenly and causing impact when it is pivoted into place. The telescopic cylinder 35 can be arranged on the upper part of the connecting arm 31 (it can be bolted). The telescopic cylinder 35 is connected to the telescopic positioning pin. The telescopic cylinder 35 is used to drive the telescopic positioning pin to extend or retract to position the workpiece. The secondary flip cylinder 36 can be connected to the top of the connecting arm 31 (it can be bolted). The secondary flip cylinder 36 is used to drive the secondary flip mechanism to flip.

[0049] During use, the first-stage flip cylinder 34 drives the connecting arm 31 to pivot. When the connecting arm 31 pivots to its position, the movable part 1 engages with the fixed part 2. The first limiting protrusion 210 is clamped in the first limiting groove 110, and the second limiting protrusion 220 is clamped in the second limiting groove 120. In this case, there are limitations in multiple directions between the connecting arm 31 and the base 32 at the same time, and because the first limiting plate part 21 is perpendicular to the second limiting plate part 22, the connecting arm 31 is limited on two perpendicular sides. This greatly enhances the stability of the connecting arm 31, avoids the shaking of the telescopic positioning pin, and improves the accuracy of the tooling flip unit 3 during repeated positioning.

[0050] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A limiting structure for a tooling turning unit, installed on the tooling turning unit, characterized in that: The limiting structure used for the tooling turning unit includes: A movable part is installed at the bottom of the connecting arm of the tooling turning unit, the movable part moves synchronously with the connecting arm, the movable part includes a first limiting block and a second limiting block, the first limiting block is formed with a first limiting groove, and the second limiting block is formed with a second limiting groove; and A fixing part, mounted on the top of the base of the tooling turning unit, the fixing part comprises a first limiting plate part and a second limiting plate part which are perpendicular to each other, the first limiting plate part is formed with a first limiting protrusion, and the second limiting plate part is formed with a second limiting protrusion; When the movable portion moves to engage with the fixed portion, the first limiting protrusion is locked in the first limiting groove, and the second limiting protrusion is locked in the second limiting groove.

2. The limiting structure for the tooling turning unit according to claim 1 is characterized in that: The first limiting plate portion is horizontally arranged on the top of the base, and the second limiting plate portion is vertically arranged at the end of the first limiting plate portion away from the connecting arm.

3. The limiting structure for the tooling turning unit according to claim 2 is characterized in that: The first limiting protrusion and the second limiting protrusion are formed as strip-shaped protrusions, the first limiting protrusion is formed on the side of the first limiting plate portion close to the second limiting plate portion, the second limiting protrusion is formed on the side of the second limiting plate portion close to the first limiting plate portion, and the length direction of the first limiting protrusion is perpendicular to the length direction of the second limiting protrusion.

4. The limiting structure for the tooling turning unit according to claim 2 is characterized in that: The first limiting block is connected to the second limiting block, the first limiting groove and the second limiting groove are formed as strip grooves, the length direction of the first limiting groove is perpendicular to the length direction of the second limiting groove, and the first limiting groove is connected to the second limiting groove.

5. The limiting structure for the tooling turning unit according to claim 4 is characterized in that: A pressure relief groove is also formed at the connection between the first limiting groove and the second limiting groove, and the pressure relief groove is recessed toward the inside of the movable part, so that when the movable part moves to engage with the fixed part, a cavity for reducing air pressure is formed between the movable part and the fixed part.

6. The limiting structure for the tooling turning unit according to claim 2, characterized in that: The movable portion is chamfered at a connection position corresponding to the first limiting plate portion and the second limiting plate portion.

7. A tooling turning unit, characterized in that: The tooling flip unit comprises a base, a connecting arm and a limiting structure for the tooling flip unit according to any one of claims 1 to 6, wherein the bottom of the connecting arm is pivotally connected to the top of the base via a hinge, and the limiting structure for the tooling flip unit is arranged between the connecting arm and the base.

8. The tooling turning unit according to claim 7, characterized in that: A first groove is formed at the bottom of the first limiting plate portion, the top portion of the base is clamped in the first groove, and the first limiting plate portion is connected to the top of the base via a threaded connector.

9. The tooling turning unit according to claim 7, characterized in that: A second groove is formed on the top of the first limiting block, and the bottom portion of the connecting arm is clamped in the second groove. The first limiting block is connected to the bottom of the connecting arm via a threaded connector.

10. The tooling turning unit according to claim 7, characterized in that: The tooling turning unit also includes: A first-stage flip cylinder is connected to the side of the base, a piston rod of the first-stage flip cylinder is hinged to the first end of the bottom of the connecting arm, the movable part is arranged at the second end of the bottom of the connecting arm, and the first-stage flip cylinder is used to drive the connecting arm to pivot around the hinged part; A telescopic cylinder is disposed on the upper portion of the connecting arm, and the telescopic cylinder is connected to the telescopic positioning pin; and The secondary turning cylinder is installed on the upper part of the connecting arm.

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