A rocker arm, cam rocker arm, disc cutter magazine tool changing manipulator and machine tool

Abstract

The application discloses a rocker arm, a cam rocker arm, a disc tool magazine tool changing manipulator and a machine tool. The rocker arm is provided with a force transmission part. The first main body part can transmit force to the second main body part through the force transmission part. The yield strength of the force transmission part is less than the yield strength of the first main body part and the yield strength of the second main body part, so that the force transmission part can be damaged before the first main body part and the second main body part reach their respective yield limits. When a hard interference occurs during tool changing, the force transmission part is damaged first, and the rocker arm can continue to be used by replacing the force transmission part. The cam rocker arm comprises the rocker arm, and the force transmission part is arranged between the cam connecting part and the second main body part. After the force transmission part is damaged, the cam does not need to be reinstalled, and only the force transmission part needs to be replaced. The disc tool magazine tool changing manipulator comprises the rocker arm, and the manipulator can be effectively protected. The machine tool comprises the rocker arm, and the machine tool parts can be effectively protected.

Description

Technical Field

[0001] This application relates to the field of CNC machine tool processing technology, and in particular to a rocker arm, a cam rocker arm, a disc tool magazine tool changing robot and a machine tool. Background Technology

[0002] In the tool changing mechanism of a CNC vertical machining center, the rocker arm is the core transmission component connecting the cam power source and the robot arm's execution components. Its function is to convert the rotational motion of the cam into the swinging motion of the robot arm, realizing key operations such as tool gripping, tool removal, and tool loading. In actual tool changing processes, failures frequently occur, such as robot arm damage, spindle chuck breakage, damage to the machine tool spindle taper hole, and tools being thrown off the worktable. Among these, the purchase and replacement costs of the robot arm and spindle chuck are relatively high, and the maintenance operation time is also long.

[0003] Analysis of the mechanical structures involved in the entire tool changing process of the machine tool revealed that the cause of the failure was that during tool removal on the spindle side, the chuck on the spindle did not open sufficiently due to unstable air pressure, hydraulic pressure failure, or malfunction of the tool release cylinder or hydraulic cylinder. The electrical system detected that the spindle tool release was in place or that the release detection switch was faulty. With the spindle chuck not fully open, the robot arm cam motor continued to rotate to perform tool removal or tool loading onto the spindle. At this time, the rocker arm would directly transmit the overload torque to the robot arm, spindle chuck, and spindle taper hole, which would break the chuck inside the spindle and cause deformation and damage to the robot arm. Utility Model Content

[0004] To solve at least one of the above-mentioned technical problems, this application provides a rocker arm, a cam rocker arm, a disc tool magazine tool changer robot and a machine tool, and the technical solution adopted is as follows.

[0005] The rocker arm provided in this application includes: First main body section; A force transmission part, which is connected to one end of the first main body; The second main body is connected at one end to the force transmission part, so that the first main body can transmit force to the second main body through the force transmission part. The yield strength of the force transmission part is less than the yield strength of the first main body and the yield strength of the second main body, so that the force transmission part can be destroyed before the first main body and the second main body reach their respective yield limits.

[0006] In some embodiments of this application, the force transmission part includes a fragile connection structure, the yield strength of which is less than the yield strength of the first main body and the yield strength of the second main body, so that the fragile connection structure can be destroyed before the first main body and the second main body reach their respective yield limits.

[0007] In some embodiments of this application, the force-transmitting part is provided with a groove, and the fragile connection structure is formed at the groove.

[0008] In some embodiments of this application, the force transmission part is provided with at least one of a through hole, a blind hole, or a pit, and the at least one of the through hole, blind hole, or pit is used to form the fragile connection structure.

[0009] In some embodiments of this application, the force-transmitting part is detachably connected between the first main body part and the second main body part.

[0010] In some embodiments of this application, the two ends of the force transmission part are respectively connected to the first main body and the second main body by bolts.

[0011] In some embodiments of this application, the two ends of the force transmission part are respectively connected to the first main body part and the second main body part by pins.

[0012] This application also provides a cam rocker arm, comprising: As described above, the rocker arm; The first main body is also provided with a cam connecting part, which is used to connect a cam.

[0013] This application also provides a disc tool magazine tool changing robot, including the rocker arm as described above.

[0014] This application also provides a machine tool including the rocker arm as described above.

[0015] This application has at least the following beneficial effects: The first main body of this application transmits force to the second main body through the force transmission part. The yield strength of the force transmission part is less than the yield strength of both the first and second main bodies, so that the force transmission part can be destroyed before the first and second main bodies reach their respective yield limits. When hard interference occurs during tool changing, resulting in torque overload, the force transmission part is destroyed first, reducing torque transmission and avoiding high losses such as robot arm deformation, spindle chuck breakage, and spindle taper hole scratches. The failure is limited to low-cost, easily damaged parts, and the rocker arm can continue to be used simply by replacing the force transmission part.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The present application will be further illustrated below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments illustrated in the following drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.

[0018] Figure 1 This is a schematic diagram of the structure of a rocker arm according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of an unconnected rocker arm according to an embodiment of this application; Figure 3 This is a partial cross-sectional view of a rocker arm according to an embodiment of this application; Figure 4 This is a schematic diagram of the force transmission part according to an embodiment of this application.

[0019] Reference numerals: First main body 100; First connecting part 110; Cam connecting part 120; First mounting part 130; Second main body 200; Second connecting part 210; Second mounting part 220; Force transmission part 300; groove 311; through hole 312; bolt hole 320; pin hole 330. Detailed Implementation

[0020] The following is combined with Figures 1 to 4 The embodiments of this application are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In the description of this application, the use of terms such as "one embodiment," "some embodiments," "an example," "some instances," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. 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.

[0025] Combination Figure 1 As shown, the rocker arm provided in this application includes: First main body section 100; Force transmission part 300 is connected to one end of the first main body part 100; The second main body 200 has one end connected to the force transmission part 300, so that the first main body 100 can transmit force to the second main body 200 through the force transmission part 300. The yield strength of the force transmission part 300 is less than the yield strength of the first main body part 100 and the yield strength of the second main body part 200, so that the force transmission part 300 can be destroyed before the first main body part 100 and the second main body part 200 reach their respective yield limits.

[0026] The first main body 100 has a first connecting portion 110, which applies a rotational force to the first main body 100, causing it to rotate around the first connecting portion 110. The second main body 200 has a second connecting portion 210, which is the endpoint of the force transmission. The first connecting portion 110 applies a force to the first main body 100, the first main body 100 applies a force to the force transmission portion 300, the force transmission portion 300 applies a force to the second main body 200, and finally, the second main body 200 applies a force to the second connecting portion 210. The two ends of the force transmission portion 300 are connected to one end of the first main body 100 and one end of the second main body 200, respectively. The yield strength of the force transmission portion 300 is less than the yield strength of both the first main body 100 and the second main body 200. When the first main body 100 continues to apply force but the second connecting portion 210 does not move, jamming occurs, i.e., an overload occurs, and the force transmission portion 300 will be preferentially damaged. The force transmission part 300 is subjected to a force that reaches its yield limit and fails, thereby reducing the force transmission.

[0027] Originally, the rocker arm was a single component. It is now divided into two parts, with the force transmission unit 300 installed afterward. The material and strength of the force transmission unit 300 need to be verified and tested to ensure it meets the minimum yield strength required for the rocker arm's intended operating conditions. This ensures that the overall rocker arm structure's rigidity and strength are not limited by the force transmission unit 300 during normal force transmission, thus meeting normal operating requirements. For example, the force transmission unit 300 may be made of ductile iron, while the first main body 100 and the second main body 200 may be made of 45 steel.

[0028] The force transmission part 300 may be damaged by fracture, plastic deformation, etc., so as to reduce the force transmitted from the first main body part 100 to the second main body part 200.

[0029] The first main body 100 of this application transmits force to the second main body 200 through the force transmission part 300. The yield strength of the force transmission part 300 is less than the yield strength of both the first main body 100 and the second main body, so that the force transmission part can be destroyed before the first and second main bodies reach their respective yield limits. When hard interference occurs during tool changing, resulting in torque overload, the force transmission part is destroyed first, reducing torque transmission and avoiding high losses such as robot arm deformation, spindle chuck breakage, and spindle taper hole scratches. The failure is limited to low-cost, easily damaged parts, and the rocker arm can continue to be used simply by replacing the force transmission part.

[0030] In some embodiments, the force transmission part 300 includes a fragile connection structure, the yield strength of which is less than the yield strength of the first main body part 100 and the yield strength of the second main body part 200, so that the fragile connection structure can be destroyed before the first main body part 100 and the second main body part 200 reach their respective yield limits.

[0031] Combination Figure 1 , 4 As shown, the force transmission part 300 can be configured with a fragile connection structure of a certain length along the length of the rocker arm. In a cross-section along the length of the rocker arm, the width of the fragile connection structure perpendicular to the length of the rocker arm is smaller than the portion connecting it to the first main body 100 and the second main body 200, forming a "necked" structure. This design is simple to manufacture and has low cost. When an overload occurs during rocker arm use, the fragile connection structure will be preferentially damaged. If it breaks, it directly interrupts the force transmission between the first main body 100 and the second main body 200, thus protecting the first main body 100, the second main body 200, and their connecting portions.

[0032] Specifically, in combination Figure 4 As shown, the force transmission part 300 is provided with a groove 311, and a fragile connection structure is formed at the groove 311. When an overload force is transmitted to the force transmission part 300, the fragile connection structure at the groove 311, due to its smallest thickness and lowest strength, will be preferentially destroyed along the bottom of the groove 311, reducing the force transmission. It can be understood that the groove 311 is recessed inward from the force transmission part 300, and its cross-section can be an arc-shaped part, a rectangular part, a trapezoidal part, etc.

[0033] Combination Figure 1 , Figure 4 As shown, in some embodiments, the force transmission part 300 is provided with at least one of a through hole 312, a blind hole, or a recess, which is used to form a fragile connection structure. The fragile connection structure may be provided with a through hole perpendicular to the length direction of the rocker arm, or a blind hole or recess recessed inward from its surface. When the fragile connection structure is subjected to an overload force, the edge of at least one of the through hole 312, blind hole, or recess forms a stress concentration area, and the fragile connection structure will be preferentially damaged due to stress concentration.

[0034] In some embodiments, the force transmission part 300 is detachably connected between the first main body part 100 and the second main body part 200. On the one hand, this facilitates the installation of the force transmission part 300 between the first main body part 100 and the second main body part 200; on the other hand, it facilitates replacement of the force transmission part 300 after it is damaged, reducing downtime and improving production efficiency.

[0035] Combination Figure 1 , 2 As shown in Figures 3 and 4, in some embodiments, the two ends of the force transmission part 300 are connected to the first main body part 100 and the second main body part 200 by bolts. The ends of the first main body part 100 and the second main body part 200 connected to the force transmission part 300 are respectively provided with a first mounting part 130 and a second mounting part 220. The first mounting part 130 and the second mounting part 220 are recessed from the surface and have a positioning function to facilitate the installation of the force transmission part 300.

[0036] Specifically, the force transmission part 300 has bolt holes 320 of the same size at both ends. The ends of the first main body part 100 and the second main body part 200 that connect with the force transmission part 300 are also provided with bolt holes 320 of the same size. The connection is made by passing bolts through the bolt holes 320, forming a detachable connection. When the force transmission part 300 is damaged, it can be removed and replaced, which is convenient and quick.

[0037] In some embodiments, the two ends of the force transmission part 300 are connected to the first main body part 100 and the second main body part 200 by pins. The two ends of the force transmission part 300 are provided with pin holes 330 of the same size. The ends of the first main body part 100 and the second main body part 200 that are connected to the force transmission part 300 are also provided with pin holes 330 of the same size. The pins are used to pass through the pin holes for positioning, ensuring that the rocker arm can maintain an accurate positional relationship after assembly.

[0038] In some other embodiments, the force transmission part 300 may be a housing that encloses one end of the first main body 100 and one end of the second main body 200. If the housing is damaged or even broken, the rocker arm can be used for processing after the housing is replaced.

[0039] In some other embodiments, in addition to brittle fracture, the force transmission part 300 may also undergo plastic deformation, and less of the force input by the first main body part 100 is transmitted to the second main body part 200, avoiding hard interference, thereby protecting the rocker arm and its connected components.

[0040] Combination Figure 1 As shown, this application also provides a cam rocker arm, including: As described above, a rocker arm; The first main body 100 is also provided with a cam connecting part 120, which is used to connect a cam.

[0041] A cam connecting portion 120 is disposed between the two ends of the first main body portion 100, and a force transmission portion 300 is disposed between the cam connecting portion 120 and the second main body portion 200. The first connecting portion 110 is the fixed end of the cam rocker arm, and the cam connecting portion 120 is the force input end of the cam rocker arm. The force transmission portion 300, disposed between the cam connecting portion 120 and the second main body portion 200, will be preferentially damaged when an overload force input from the cam connecting portion 120 is transmitted to this position, reducing the power transmission from the cam connecting portion 120 to the second connecting portion 210, preventing the overload force from reaching the second connecting portion 210, thus protecting the cam rocker arm and its connected parts. Furthermore, the force transmission portion 300 can be replaced for continued use.

[0042] This application also provides a disc tool magazine changing robot, including the rocker arm as described above. The disc tool magazine changing robot of this application, including the rocker arm as described above, can effectively protect the robot, reduce replacement and maintenance time, and improve work efficiency.

[0043] This application also provides a machine tool including the aforementioned rocker arm. The machine tool of this application, including the aforementioned rocker arm, can effectively protect machine tool components, reduce replacement and maintenance time, and improve work efficiency.

[0044] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A rocker arm, characterized in that, include: First main body section; A force transmission part, which is connected to one end of the first main body; The second main body is connected at one end to the force transmission part, so that the first main body can transmit force to the second main body through the force transmission part. The yield strength of the force transmission part is less than the yield strength of the first main body and the yield strength of the second main body, so that the force transmission part can be destroyed before the first main body and the second main body reach their respective yield limits.

2. The rocker arm according to claim 1, characterized in that: The force transmission part includes a fragile connection structure, the yield strength of which is less than the yield strength of the first main body and the yield strength of the second main body, so that the fragile connection structure can be destroyed before the first main body and the second main body reach their respective yield limits.

3. The rocker arm according to claim 2, characterized in that: The force transmission part is provided with a groove, and the weak connection structure is formed at the groove.

4. The rocker arm according to claim 2 or 3, characterized in that: The force transmission part is provided with at least one of through holes, blind holes, or recesses, and at least one of the through holes, blind holes, or recesses is used to form the fragile connection structure.

5. The rocker arm according to claim 1, characterized in that: The force transmission part is detachably connected between the first main body part and the second main body part.

6. The rocker arm according to claim 5, characterized in that: The two ends of the force transmission part are respectively connected to the first main body and the second main body by bolts.

7. The rocker arm according to claim 5, characterized in that: The two ends of the force transmission part are respectively connected to the first main body and the second main body by pins.

8. A cam rocker arm, characterized in that, include: The rocker arm as described in any one of claims 1 to 7 above; The first main body is also provided with a cam connecting part, which is used to connect a cam.

9. A circular tool magazine tool changing robot, characterized in that, Includes the rocker arm as described in any one of claims 1 to 7 above.

10. A machine tool, characterized in that, Includes the rocker arm as described in any one of claims 1 to 7 above.

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