A pressure foot unit drive component

Abstract

The present invention discloses a driving assembly for a pressure foot unit, belonging to the technical field of drilling and riveting machines. A driving assembly for a pressure foot unit includes a pressure foot base, a pressure foot extension plate, a pressure nose, and a plurality of driving cylinders. The pressure foot base is a concave plate, and the pressure foot extension plate is movably connected to the middle part. A driving cylinder is connected to the concave surface of the pressure foot base, and the driving cylinder is connected to the pressure foot extension plate through a floating joint. The main body of the floating joint is a bushing. During drilling and riveting, the driving cylinder drives the pressure foot extension plate and the pressure nose, so that the upper riveting die moves along its height direction to achieve drilling. The present invention aims to provide a light and synchronously drivable driving assembly for a pressure foot unit.

Description

Technical Field

[0001] The present invention relates to the technical field of drill riveting machines, and particularly to a driving assembly for a pressure foot unit. Background Art

[0002] In the mechanical connection of skin-skeleton structures, riveting is commonly used. A single large panel part represented by the skin-skeleton structure requires riveting thousands or even tens of thousands of rivets. Designing an integrated automatic drill riveting machine to perform operations such as drilling, gluing, inserting rivets, and riveting on the skin can greatly improve the riveting efficiency.

[0003] The pressure foot unit of a drill riveting machine is one of its core components, and the drilling and riveting process is achieved through the driving assembly of the pressure foot unit. Patent No. US5404633A provides a method for dynamically supporting a drill sleeve in a drill riveting machine, which can achieve the axial movement of the drill sleeve and thus complete the drilling operation. Currently, most drill riveting machines are driven by a single power source, and it is difficult to achieve synchronous feeding. Patent No. CN119077376A discloses an upper actuator of a drill riveting machine. The pressure foot at the end of the upper actuator is provided with two driving assemblies, and the driving assemblies are located at both ends of the pressure foot and can drive the pressure foot to move along its height direction. There is still room for improvement in this device. Summary of the Invention

[0004] The purpose of the present invention is to provide a lightweight and synchronously drivable driving assembly for a pressure foot unit, so that the moving station can stably extend and the action response speed of the pressure foot unit can be improved.

[0005] The present invention specifically provides the following technical solutions:

[0006] A driving assembly for a pressure foot unit includes a pressure foot base and a driving cylinder. The pressure foot base is a concave plate, and a pressure foot extension plate is movably connected in the middle. The concave surface of the pressure foot base is connected with a driving cylinder, and the driving cylinder is connected with the pressure foot extension plate through a floating joint. The driving cylinder uses compressed air as a power driving mechanism, and the piston in the driving cylinder makes a smooth reciprocating motion in the cylinder barrel, thereby driving the pressure foot extension plate to move along its height direction. In order to eliminate over-constraint, a floating joint is connected between the driving cylinder and the pressure foot extension plate, which can make the pressure foot extension plate move smoothly. It should be noted that the pressure foot extension plate is movably connected to the pressure foot base, and the driving cylinder will not drive the pressure foot base to move because the pressure foot base integrates various components and has a large weight. The present invention sets the pressure foot extension plate to reduce the inertia of the moving parts, increase the flexibility of the device, and make its action response faster.

[0007] The driving cylinders are at least three. Preferably, the number of driving cylinders is four, symmetrically arranged around the presser foot extension plate, providing support at more than three acting points for the presser foot extension plate, enabling the presser foot extension plate to extend stably. The distance between the driving cylinders is less than twice the distance between the driving cylinder and the center of the presser foot extension plate. The appropriate distance between the driving cylinders is conducive to the stable extension of the presser foot extension plate.

[0008] Specifically, the driving cylinder includes a cylinder barrel. The cylinder barrel is square and internally provided with a piston. The piston is connected with a piston rod, and the piston rod is coaxial with the floating joint. The piston in the driving cylinder serves as the driving part and can reciprocate in the cylinder barrel, thereby enabling the piston rod and the floating joint to move. The floating joint can eliminate the overconstraint of the driving cylinder on the presser foot extension plate, keep the presser foot extension plate stable when extending, and ensure synchronous driving.

[0009] Specifically, the main body of the floating joint is a connecting rod. The connecting rod penetrates through the presser foot base and is connected with the presser foot extension plate. The connecting rod and the piston rod are on the same axis. A protrusion is provided in the middle of the connecting rod, and a coaxial bushing is provided at one end. A buffer gasket is provided between the bushing and the protrusion of the connecting rod. The length of the bushing is one-fifth to one-half of the length of the connecting rod. The floating joint of the driving cylinder is mainly realized by the bushing. The bushing is a polyurethane bushing. The polyurethane bushing has elasticity and high load-bearing capacity. When the piston rod moves, the connecting rod moves, and the protrusion thereof applies a force to the buffer gasket and the bushing. Then the bushing drives the shaft retaining ring and the connected presser foot extension plate to move. When the driving is asynchronous, the elastic bushing deforms and applies a force to hinder the movement of the connecting rod, thereby enabling synchronous driving and the stable extension of the presser foot extension plate. The length of the bushing is set to be one-fifth to one-half of the length of the connecting rod. If the bushing is too short, the elasticity of the floating joint will be insufficient. In addition, the buffer gasket and the bushing can reduce the wear between the connecting rod and the presser foot base and disperse the impact effect on the presser foot extension plate.

[0010] Specifically, the main body of the presser foot extension plate is a square plate with four corners extending outwards. A press nose is provided in the middle of the square plate. A hole is opened in the center of the press nose, and a coaxial upper riveting die can be inserted. During operation, the piston of the driving cylinder moves, pushing out the piston rod and the connecting rod. The press nose of the presser foot extension plate presses tightly against the skin, and the upper riveting die drills holes. The design of the micro-motion presser foot structure enables faster action response and more stable pressing.

[0011] Specifically, circular grooves are provided at the four extended corners of the presser foot extension plate, which cooperate with the connecting rods of the driving cylinders. Shaft retaining rings are provided at the ends of the connecting rods, and two fasteners are provided on the shaft retaining rings. Two limiting holes are provided at each of the four extended corners of the presser foot extension plate, which cooperate with the shaft retaining rings.

[0012] The connecting rod of the floating joint is fitted with the circular groove; the shaft retaining ring of the floating joint is provided with a fastener that can be fitted with the limiting hole; both can play a role in fastening the floating joint and the presser foot extension plate, enabling the position of the presser foot extension plate to be fixed in the horizontal direction, and the presser foot extension plate to stably extend in the vertical direction as the piston of the driving cylinder moves. There is both a rigid connection and an elastic connection between the driving cylinder and the presser foot extension plate, and the combination of the two connection methods can achieve synchronous driving of the presser foot extension plate and the press nose, avoiding overconstraint caused by only rigid connection and shaking caused by only elastic connection, enabling the presser foot extension plate to stably extend horizontally and improving the quality of drilling and riveting.

[0013] The beneficial effects of the present invention are as follows: a lightweight and synchronously drivable pressure foot unit driving assembly enables the presser foot extension plate to stably extend through the driving cylinder, so that the press nose connected to the presser foot extension plate presses tightly against the skin. The lightweight micro-motion presser foot design is beneficial to improving the action response speed. The driving cylinder is provided with a floating joint, and the floating joint is connected to the presser foot extension plate, which can eliminate overconstraint, achieve synchronous driving, and further improve the product quality. Brief Description of the Drawings

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0015] Figure 1 It is a schematic diagram of the internal structure of the pressure foot unit of the present invention.

[0016] Figure 2 It is a schematic diagram of the driving cylinder and the floating joint of the driving assembly of the present invention.

[0017] Figure 3 It is a schematic diagram of the external structure of the pressure foot unit of the present invention.

[0018] Figure 4 It is a cross-sectional view of the pressure foot unit driving assembly of the present invention.

[0019] Figure 5 It is a schematic diagram of the presser foot extension plate of the present invention.

[0020] Explanation of the reference numerals in the drawings: 1 - presser foot base; 2 - driving cylinder; 21 - shaft retaining ring; 22 - bushing; 23 - buffer gasket; 24 - connecting rod; 25 - cylinder barrel; 26 - piston; 27 - piston rod; 3 - upper riveting die; 4 - presser foot extension plate; 41 - circular groove; 42 - limiting hole; 5 - press nose. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] First, the concepts involved in the present application will be described in conjunction with the accompanying drawings. It should be noted here that the following descriptions of each concept are only for making the content of the present application easier to understand, and do not represent a limitation on the protection scope of the present application; at the same time, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0023] Embodiment 1

[0024] A driving assembly for a presser foot unit includes a presser foot base 1 and a driving cylinder 2. The presser foot base 1 is a concave plate, and a presser foot extension plate 4 is movably connected in the middle. The concave surface of the presser foot base 1 is connected with a driving cylinder 2, and the driving cylinder 2 is connected with the presser foot extension plate 4 through a floating joint. The driving cylinder 2 uses compressed air as a power driving mechanism. The piston 26 in the driving cylinder 2 makes a stable reciprocating motion in the cylinder barrel 25, thereby driving the presser foot extension plate 4 to move along its height direction. In order to eliminate over-constraint, a floating joint is connected between the driving cylinder 2 and the presser foot extension plate 4, which can make the presser foot extension plate 4 move smoothly. It should be noted that the presser foot extension plate 4 is movably connected to the presser foot base 1, and the driving cylinder 2 does not drive the presser foot base 1 to move because the presser foot base 1 integrates various components and has a large weight. In the present invention, the presser foot extension plate 4 is provided to reduce the inertia of the moving parts, increase the flexibility of the device, and make its action response faster.

[0025] The driving cylinder 2 is at least three. Preferably, the number of driving cylinders 2 is four, symmetrically arranged around the presser foot extension plate 4, providing support at more than three acting points for the presser foot extension plate 4 to stably extend the presser foot extension plate 4.

[0026] Specifically, the driving cylinder 2 includes a cylinder barrel 25, the cylinder barrel 25 is square, and a piston 26 is arranged inside. The piston 26 is connected with a piston rod 27, and the piston rod 27 is coaxial with the floating joint. The piston 26 in the driving cylinder 2 is the active part and can reciprocate in the cylinder barrel 25, so that the piston rod 27 and the floating joint move. The floating joint can eliminate the over-constraint of the driving cylinder 2 on the presser foot extension plate 4, keep the presser foot extension plate 4 stable when extending, and ensure synchronous driving.

[0027] Specifically, the floating joint body is a connecting rod 24, and the connecting rod 24 passes through the presser foot base 1 and is connected to the presser foot extension plate 4. The connecting rod 24 and the piston rod 27 are on the same axis. A protrusion is provided in the middle of the connecting rod 24, and a coaxial bushing 22 is provided at one end. A buffer gasket 23 is provided between the bushing 22 and the protrusion of the connecting rod 24. The length of the bushing 22 is one-fifth to one-half of the length of the connecting rod 24. The floating joint of the driving cylinder 2 is mainly realized by the bushing 22. The bushing 22 is a polyurethane bushing. The polyurethane bushing has elasticity and high load-bearing capacity. When the piston rod 27 moves, the connecting rod 24 moves, and its protrusion applies a force to the buffer gasket 23 and the bushing 22. Then, the bushing 22 drives the shaft retaining ring 21 and the connected presser foot extension plate 4 to move. When the driving is asynchronous, the elastic bushing 22 deforms and applies a force to the connecting rod 24 to hinder its movement, so as to make the driving synchronous and the presser foot extension plate 4 extend smoothly. The length of the bushing 22 is set to be one-fifth to one-half of the length of the connecting rod 24. If the bushing 22 is too short, the elasticity of the floating joint will be insufficient. In addition, the buffer gasket 23 and the bushing 22 can reduce the wear between the connecting rod 24 and the presser foot base 1 and disperse the impact effect on the presser foot extension plate 4.

[0028] Specifically, the main body of the presser foot extension plate 4 is a square plate with four corners extending outward. A press nose 5 is provided in the middle of the square plate. A hole is opened in the center of the press nose 5, and a coaxial upper riveting die 3 can be inserted. During operation, the piston 26 of the driving cylinder 2 moves, pushing out the piston rod 27 and the connecting rod 24. The press nose 5 of the presser foot extension plate 4 presses against the skin, and the upper riveting die 3 drills holes. The design of the micro-motion presser foot structure can make the action response faster and the pressing more stable.

[0029] Specifically, circular grooves 41 are provided at the four extended corners of the presser foot extension plate 4. The circular grooves 41 cooperate with the connecting rod 24 of the driving cylinder 2. An end of the connecting rod 24 is provided with a shaft retaining ring 21, and two fasteners are provided on the shaft retaining ring 21. Two limit holes 42 are provided at each of the four extended corners of the presser foot extension plate 4 and cooperate with the shaft retaining ring 21.

[0030] The connecting rod 24 of the floating joint cooperates with the circular groove 41; fasteners are provided on the shaft retaining ring 21 of the floating joint and can cooperate with the limit holes 42; both can play a role in fastening the floating joint and the presser foot extension plate 4, and can fix the position of the presser foot extension plate 4 in the horizontal direction. The presser foot extension plate 4 moves with the piston 26 of the driving cylinder 2 to achieve stable extension in the vertical direction. There is both a rigid connection and an elastic connection between the driving cylinder 2 and the presser foot extension plate 4. The combination of the two connection methods can realize synchronous driving of the presser foot extension plate 4 and the press nose 5, avoid over-constraint caused by only rigid connection and shaking caused by only elastic connection, and make the presser foot extension plate 4 extend horizontally and stably.

[0031] The distance between the driving cylinders 2 is less than twice the distance between the driving cylinder 2 and the center of the presser foot extension plate 4. Designing an appropriate distance between the driving cylinders 2 is conducive to synchronous driving, enabling the presser foot extension plate 4 to extend stably and improving the quality of drilling and riveting.

[0032] It should be noted that the terms used in this application are only for describing specific embodiments and do not limit the scope of this application. As shown in the specification of this application, unless the context clearly indicates otherwise, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include the plural. The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method or device including the said element.

[0033] It should also be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application. Unless otherwise clearly stipulated and defined, terms such as "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] The above-mentioned embodiments and / or implementation manners are only used to illustrate the preferred embodiments and / or implementation manners for realizing the technology of the present invention, and do not impose any formal restrictions on the implementation manners of the technology of the present invention. Any person skilled in the art, without departing from the scope of the technical means disclosed in the content of the present invention, can make some changes or modifications to other equivalent embodiments, but should still be regarded as the same technology or embodiment as the present invention in essence.

[0035] In this article, specific examples are used to elaborate on the principles and implementation modes of this application. The descriptions of the above embodiments are only used to help understand the method and its core idea of this application. The above are only the preferred implementation modes of this application. It should be noted that due to the limited nature of literal expression and objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principles of this application, several improvements, refinements or changes can also be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the inventive concept and technical solution to other occasions without improvement, shall all be regarded as the protection scope of this application.

Claims

1. A pressure foot unit driving assembly, comprising a pressure foot base (1) and a driving cylinder (2), characterized in that: The presser foot base (1) is a concave plate, and a presser foot extension plate (4) is movably connected to the middle part. A driving cylinder (2) is connected to the concave surface of the presser foot base (1), and the driving cylinder (2) and the presser foot extension plate (4) are connected through a floating joint; There are at least three driving cylinders (2). The main body of the floating joint is a connecting rod (24). The connecting rod (24) penetrates through the presser foot base (1) and is connected to the presser foot extension plate (4). A protrusion is provided in the middle of the connecting rod (24), and a coaxial bushing (22) is provided at one end. The floating joint is used to eliminate the over-constraint of the driving cylinder (2) on the presser foot extension plate (4). A buffer gasket (23) is provided between the bushing (22) and the protrusion of the connecting rod (24); When the driving is asynchronous, the elastic bushing (22) deforms and applies a force to hinder the movement of the connecting rod (24), so as to make the driving synchronous.

2. The driving assembly of a presser foot unit according to claim 1, characterized in that: The driving cylinder (2) includes a cylinder barrel (25). The cylinder barrel (25) is square, and a piston (26) is arranged inside. The piston (26) is connected with a piston rod (27), and the piston rod (27) is coaxial with the floating joint.

3. A pressure foot unit drive assembly according to claim 1, characterized in that: The length of the bushing (22) is one-fifth to one-half of the length of the connecting rod (24).

4. A pressure foot unit driving assembly according to claim 1, characterized in that: The main body of the presser foot extension plate (4) is a square plate with four corners extending outwards, and a press nose (5) is arranged in the middle of the square plate.

5. The driving assembly of a presser foot unit according to claim 4, wherein: Round grooves (41) are provided at the four extended corners of the presser foot extension plate (4). The round grooves (41) cooperate with the connecting rods (24) of the driving cylinders (2). End retainers (21) are provided at the ends of the connecting rods (24), and two fasteners are provided on the end retainers (21).

6. The driving assembly of a presser foot unit according to claim 5, characterized in that: Two limit holes (42) are provided at each of the four extended corners of the presser foot extension plate (4) and cooperate with the end retainers (21).

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