A pressure foot unit for a rivet

Abstract

The present invention discloses a pressure foot unit for rivets, belonging to the technical field of drilling and riveting machines. The pressure foot unit includes a pressure foot base, a driving assembly and a monitoring device therein. The driving assembly consists of a driving cylinder, a pressure foot extension plate and a pressure nose, and can realize the pressing function. The monitoring device is configured with a laser displacement sensor, a pressure sensor, an inner cavity monitoring of the pressure foot, an infrared ranging device and a broken tool detection device, and can provide real-time feedback on the position of the pressure foot, the pressure value and the situation of the rivets in the inner cavity of the pressure foot. In addition, a glue coating device, a tool lubrication and cooling device, a cleaning device, etc. are also provided in the inner cavity of the pressure foot base. In the present invention, the pressure foot unit is designed with high integration and a simple layout, integrating functions such as pressing, normal direction detection, broken tool detection, glue coating, dust removal and chip suction, etc. into one.

Description

Technical Field

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

[0002] An automatic drilling and riveting machine is an automated device that can complete processes such as workpiece positioning, clamping, hole making, nail feeding, and riveting at one time. Due to advantages such as high connection strength, good connection stability, and adaptability to complex structures, the drilling and riveting process is indispensable in the manufacturing of aircraft parts, wall panels, etc.

[0003] The pressure foot unit is located at the end of the upper riveting head main machine and can perform drilling and riveting operations. The pressure foot unit integrates an actuator, a monitoring device, and a cleaning device, and has multiple stations. The installation position of the measurement system often differs from the working position of the actuator. Therefore, the pressure foot unit can perform drilling and riveting operations in an overall moving manner, such as in patent number CN119077376A, or a mobile measurement system can be used. Although the mobile measurement system avoids the overall movement of the pressure foot unit, due to the addition of one more station, the layout of the pressure foot inner cavity is more complex, and interference is likely to occur between stations, affecting the parallel operation of each station. Summary of the Invention

[0004] The purpose of the present invention is to provide a highly integrated pressure foot unit for rivets that can provide real-time feedback on the position of the pressure foot, design a micro-motion pressure foot to simplify the layout, avoid the overall movement of the pressure foot or interference between stations inside the pressure foot, and improve the drilling and riveting efficiency and product quality.

[0005] To solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] A pressure foot unit for rivets, comprising a pressure foot base and a driving cylinder therein. The pressure foot base is a concave plate, and a pressure foot extension plate is provided in the middle of the concave inner cavity. The pressure foot extension plate is connected to a pressure nose located outside the pressure foot base. The driving cylinder is connected to the pressure foot extension plate. A glue application device with a lateral inclination is provided in the inner cavity of the pressure foot base, and the injection port of the glue application device is placed near the pressure nose. A laser displacement sensor is embedded in the pressure foot base. The pressure foot unit adopts a highly integrated design, integrating functions such as pressing, normal direction detection, and glue application. The concave design can miniaturize the overall longitudinal size of the pressure foot unit and generate a relatively flat boundary, which is beneficial to simplifying the layout of the pressure foot unit. It is equipped with a high-precision proportional servo valve to control the cylinder. When the pressure foot unit works, the driving cylinder drives the pressure foot extension plate to extend and the pressure nose to move. The pressure foot unit adopts a full-closed-loop feedback design and is equipped with a high-precision displacement feedback sensor. The laser displacement sensor is a sensor that uses laser technology for measurement. It consists of a laser, a laser detector, and a measurement circuit, and can accurately measure the position, displacement, and other changes of the measured object without contact. Here, the laser displacement sensor can real-time feedback the extension position of the pressure foot extension plate. The laser displacement sensor is installed in an embedded manner, does not occupy the working space, can reduce the interference with the product, and matching a high-precision and high-response laser displacement sensor can improve the normal direction detection accuracy and efficiency.

[0007] Specifically, there are at least two laser displacement sensors. When the pressure foot extension plate extends, there may be a slight inclination. The laser displacement sensors can be set to four, symmetrically arranged around the pressure foot extension plate, real-time feedback the displacement and inclination angle of the pressure foot extension plate, detect whether the driving components drive synchronously, and make adjustments according to the feedback situation to prevent the rivets from loosening or skewing due to the inclination of the pressure foot extension plate, and further improve the product quality.

[0008] Specifically, both ends of the concave surface of the pressure foot base are planes, connected to the middle of the concave surface by inclined plates, and the included angle between the inclined plates and the horizontal plane is 20° - 50°. Pressure sensors are provided at both ends of the concave surface, and the upper surface of the pressure sensors is in contact with the components above the pressure foot unit. The included angle between the inclined plates of the pressure foot base and the horizontal plane is 20° - 50°, and the gentle transition can reduce stress concentration and increase the service life of the pressure foot. In addition, its internal area in the horizontal dimension is larger, which can make the layout of the pressure foot assembly more reasonable, avoid interference, and reduce the difficulty of processing and assembling the pressure foot. During drilling and riveting, when the pressure nose contacts the skin and receives an upward acting force, the pressure foot base is pressed, and the pressure sensors on the pressure foot base can detect the magnitude of the pressure received thereon, which is used to judge whether the pressure foot is in a pressed state, improving the product quality and efficiency.

[0009] The inner cavity of the presser foot base is provided with an infrared ranging device and presser foot inner cavity monitoring. The infrared ranging device is used to detect the protruding length of the rivet and the distance between the rivet and the skin; the presser foot inner cavity monitoring is used to detect the protruding condition of the presser foot protruding plate and the condition of the tools and chip entanglement inside the presser foot base.

[0010] The inner cavity of the presser foot base is provided with a dust suction pipe. The dust suction pipe is of a straight tube type, and the angle between its axis and the plane where the concave surface of the presser foot base is located is 0° to 45°. The inlet of the dust suction pipe is placed near the presser nose. The pressure foot unit integrates the functions of dust suction and chip removal. Setting the dust suction pipe as a straight tube type can solve the problem of too few maintenance points caused by too many pipe elbows in the dust suction pipe and prevent chip blockage in the dust suction pipe. When the angle between the axis of the dust suction pipe and the plane where the concave surface of the presser foot base is located is 0°, due to the limitation of the geometric shape of the presser foot base, the dust suction pipe penetrates through the presser foot base, with one section inside the inner cavity of the presser foot base and the other section outside the presser foot base; the angle between the axis of the dust suction pipe and the plane where the concave surface of the presser foot base is located can be 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45° to avoid interference between the dust suction pipe and other components inside the pressure foot and save the internal space of the pressure foot unit.

[0011] The middle part of the presser foot protruding plate is connected to the presser nose. There is a hole in the center of the presser nose, and an upper riveting die is arranged on the same axis. A tool lubrication and cooling device is arranged on the presser foot protruding plate. The coaxial upper riveting die and the side-axis glue application device move to the vicinity of the hole in the presser nose during operation. The tool lubrication and cooling device can move up and down together with the presser foot protruding plate to cool and lubricate the tool.

[0012] An upper riveting skin chip blowing device is arranged outside the presser foot base. The upper riveting skin chip blowing device includes a support column and a chip blowing head. The chip blowing head is inclined towards the upper riveting die and has a narrow and long opening. The upper riveting skin chip blowing device can clean the surface of the processed skin. The chip blowing head is inclined and the angle is adjustable, which is convenient for operation. The narrow and long opening can avoid interference and increase the chip blowing area at the same time.

[0013] Preferably, a rivet discard device is arranged on one side of the middle part of the presser foot base. It is convenient for the recycling and treatment of rivets and improves the drilling and riveting efficiency.

[0014] Preferably, an outer edge plate is arranged on one side of the middle part of the presser foot base. The broken tool detection device and the tip chip entanglement removal device on the outer edge plate are arranged facing the presser nose. The pressure foot unit has a compact structure. In order to prevent interference between the internal parts of the pressure foot and reduce the manufacturing difficulty of the pressure foot components, the broken tool detection device and the tip chip entanglement removal device are arranged on the outer edge plate of the presser foot base, adding the functions of broken tool detection and chip entanglement cleaning and improving the working efficiency of the drilling and riveting machine.

[0015] The beneficial effects of the present invention are as follows: The presser foot unit is designed with high integration, integrating functions such as pressing, monitoring, glue application, dust removal and chip suction, etc. The micro-motion presser foot design can avoid the overall movement of the pressure foot or interference between workstations inside the pressure foot. The monitoring device includes a laser displacement sensor, a pressure sensor, an internal cavity monitoring of the presser foot, an infrared ranging device, and a broken tool detection device, which can real-time feedback the position of the presser foot, the pressure value, and the situation of the rivets inside the presser foot cavity, improving the drilling and riveting efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 according to the provided drawings.

[0017] Figure 1 It is a schematic internal structure diagram of a pressure foot unit for rivets of the present invention.

[0018] Figure 2 It is a schematic external view of a pressure foot unit for rivets of the present invention.

[0019] Figure 3 It is a cross-sectional view of a pressure foot unit for rivets of the present invention.

[0020] Description of reference numerals: 1 - Presser foot base; 2 - Driving cylinder; 3 - Upper riveting die; 4 - Presser foot extension plate; 5 - Laser displacement sensor; 6 - Presser nose; 7 - Pressure sensor; 8 - Glue application device; 9 - Infrared ranging device; 10 - Tool lubrication and cooling device; 11 - Broken tool detection device; 12 - Chip entanglement removal device at the tool tip; 13 - Dust suction pipe; 14 - Rivet waste nail device; 15 - Internal cavity monitoring of the presser foot; 16 - Chip blowing device for the upper riveting skin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the 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 of 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 belong to the scope of protection of the present invention.

[0022] First, the concepts involved in this 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 this application easier to understand and do not represent a limitation on the protection scope of this application; at the same time, without conflict, the embodiments and features in the embodiments of this application can be combined with each other. The following will refer to the drawings and combine the embodiments to detail this application.

[0023] Embodiment 1

[0024] A pressure foot unit for a rivet includes a pressure foot base 1 and a driving cylinder 2 therein. The pressure foot base 1 is a concave plate, and a pressure foot extension plate 4 is provided in the middle of the concave inner cavity. The pressure foot extension plate 4 is connected to a pressure nose 6 located outside the pressure foot base 1. The driving cylinder 2 is connected to the pressure foot extension plate 4. A tilting glue application device 8 is provided in the inner cavity of the pressure foot base 1, and the ejection port of the glue application device 8 is placed near the pressure nose 6. A laser displacement sensor 5 is embedded in the pressure foot base 1. The pressure foot unit adopts a highly integrated design, integrating functions such as pressing, normal direction detection, and glue application. The concave design can make the overall longitudinal size of the pressure foot unit smaller and generate a relatively flat boundary, which is beneficial to simplifying the layout of the pressure foot unit; it is equipped with a high-precision proportional servo valve to control the cylinder. When the pressure foot unit works, the driving cylinder 2 drives the pressure foot extension plate 4 to extend and the pressure nose 6 to move; the pressure foot unit adopts a full-closed-loop feedback design and is configured with a high-precision displacement feedback sensor. The laser displacement sensor is a sensor that uses laser technology for measurement. It consists of a laser, a laser detector, and a measurement circuit, and can accurately measure the position, displacement, etc. changes of the measured object without contact. Here, the laser displacement sensor 5 can real-time feedback the extension position of the pressure foot extension plate 4. The laser displacement sensor 5 is installed in an embedded manner, does not occupy the working space, can reduce the interference with the product, and matching a high-precision and high-response laser displacement sensor 5 can improve the normal direction detection accuracy and efficiency.

[0025] Specifically, there are at least two laser displacement sensors 5. When the pressure foot extension plate 4 extends, there may be a slight tilt. The laser displacement sensors 5 can be set to four, symmetrically arranged around the pressure foot extension plate 4, real-time feedback the displacement and tilt angle of the pressure foot extension plate 4, detect whether the driving components drive synchronously, and make adjustments according to the feedback situation to prevent the rivets from loosening or skewing due to the tilt of the pressure foot extension plate 4, and further improve the product quality.

[0026] Specifically, both ends of the concave surface of the presser foot base 1 are flat, connected to the middle of the concave surface by an inclined plate. The included angle between the inclined plate and the horizontal plane is 20° - 50°. Pressure sensors 7 are provided at both ends of the concave surface. The upper surface of the pressure sensor 7 is in contact with the component above the presser foot unit. The included angle between the inclined plate of the presser foot base 1 and the horizontal plane is 20° - 50°, and the gentle transition can reduce stress concentration and increase the service life of the presser foot. In addition, its internal area in the horizontal dimension is larger, which can make the layout of the presser foot assembly more reasonable, avoid interference, and reduce the difficulty of processing and assembling the presser foot. During drilling and riveting, the press nose 6 contacts the skin and receives an upward acting force, causing the presser foot base 1 to be pressed. The pressure sensor 7 on the presser foot base 1 can detect the magnitude of the pressure it receives, used to determine whether the presser foot is in a tightened state, improving product quality and efficiency.

[0027] An infrared ranging device 9 and a presser foot inner cavity monitor 15 are provided in the inner cavity of the presser foot base 1. The infrared ranging device 9 is used to detect the length of the rivet protruding and the distance between the rivet and the skin; the presser foot inner cavity monitor 15 is used to detect the protruding situation of the presser foot extension plate 4 and the situation of the tools and chip entanglement inside the presser foot base 1.

[0028] A dust suction pipe 13 is provided in the inner cavity of the presser foot base 1. The dust suction pipe 13 is a straight tube type, and the included angle between its axis and the plane where the concave surface of the presser foot base 1 is located is 0° - 45°. The inlet of the dust suction pipe 13 is placed near the press nose 6. The presser foot unit integrates the functions of dust suction and chip removal. The dust suction pipe 13 being set as a straight tube type can solve the problem of too few maintenance points caused by too many pipe elbows in the dust suction pipe, preventing the dust suction pipe from being blocked by chips. When the included angle between the axis of the dust suction pipe 13 and the plane where the concave surface of the presser foot base 1 is located is 0°, due to the geometric shape limitation of the presser foot base 1, the dust suction pipe 13 penetrates the presser foot base 1, with one section inside the presser foot base 1 and the other section outside the presser foot base 1; the included angle between the axis of the dust suction pipe 13 and the plane where the concave surface of the presser foot base 1 is located can be 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, to avoid interference between the dust suction pipe 13 and other components inside the presser foot and save the internal space of the presser foot unit.

[0029] The middle of the presser foot extension plate 4 is connected to the press nose 6. A hole is provided at the center of the press nose 6, and an upper riveting die 3 is provided on the same axis. A tool lubrication and cooling device 10 is provided on the presser foot extension plate 4. The coaxial upper riveting die 3 and the side-axis glue application device 8 move to near the hole of the press nose 6 during operation. The tool lubrication and cooling device 10 can move up and down together with the presser foot extension plate 4 to cool and lubricate the tool.

[0030] An upper riveting skin chip blowing device 16 is provided on the outer side of the presser foot base 1. The upper riveting skin chip blowing device 16 includes a support column and a chip blowing head. The chip blowing head is inclined towards the upper riveting die 3 and has a narrow and long opening. The upper riveting skin chip blowing device 16 can clean the surface of the processed skin. The chip blowing head is inclined and its angle is adjustable, which is convenient for operation. The narrow and long opening can avoid interference and increase the chip blowing area.

[0031] Preferably, a rivet discard device 14 is provided on one side of the middle part of the presser foot base 1. It is convenient for the recycling and treatment of rivets and improves the drilling and riveting efficiency.

[0032] Preferably, an outer edge plate is provided on one side of the middle part of the presser foot base 1. The broken tool detection device 11 and the chip entanglement removal device 12 on the outer edge plate face the press nose 6. The pressure foot unit has a compact structure. In order to prevent interference of the internal parts of the pressure foot and reduce the manufacturing difficulty of the pressure foot assembly, the broken tool detection device 11 and the chip entanglement removal device 12 are arranged on the outer edge plate of the presser foot base 1, which increases the functions of broken tool detection and chip entanglement cleaning and improves the working efficiency of the drilling and riveting machine.

[0033] 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 an exception, 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 other identical elements in the process, method or device including the said element.

[0034] 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 specified and defined, terms such as "installed", "connected", "connected" 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 or 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 situations.

[0035] The above-described embodiments and / or implementation manners are only used to illustrate the preferred embodiments and / or implementation manners for implementing 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, may 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.

[0036] In this article, specific examples are used to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. The above is only the preferred implementation manner of the present application. It should be noted that due to the limited nature of language expression and the objectively infinite specific structures, for those of ordinary skill in the art in this technical field, without departing from the principles of the present 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 concept and technical solution of the invention to other occasions without improvement, should all be regarded as the protection scope of the present application.

Claims

1. A pressure foot unit for a rivet, comprising a pressure foot base (1) and a driving cylinder (2) therein, characterized in that: The presser foot base (1) is a concave plate. A presser foot extension plate (4) is provided in the middle of the concave inner cavity. The presser foot extension plate (4) is connected to a press nose (6) located outside the presser foot base (1). The driving cylinder (2) is connected to the presser foot extension plate (4). A glue application device (8) that is inclined is provided in the inner cavity of the presser foot base (1). The ejection port of the glue application device (8) is placed near the press nose (6). A laser displacement sensor (5) is embedded in the presser foot base (1); Both ends of the concave surface of the presser foot base (1) are flat surfaces, which are connected to the middle of the concave surface by inclined plates. The included angle between the inclined plates and the horizontal plane is 20° to 50°; An infrared ranging device (9) and a presser foot inner cavity monitor (15) are provided in the inner cavity of the presser foot base (1); The presser foot extension plate (4) is a micro-motion presser foot to avoid the overall movement of the presser foot or interference between work positions inside the presser foot.

2. The pressure foot unit for a rivet according to claim 1, characterized in that: There are at least two laser displacement sensors (5), which are arranged around the presser foot extension plate (4).

3. The pressure foot unit for a rivet according to claim 1, characterized in that: Pressure sensors (7) are provided at both ends of the presser foot base (1). The upper surfaces of the pressure sensors (7) are in contact with the components above the presser foot unit.

4. The pressure foot unit for a rivet according to claim 1, characterized in that: A dust suction pipe (13) is provided in the inner cavity of the presser foot base (1). The dust suction pipe (13) is a straight cylinder type, and the included angle between its axis and the plane where the concave surface of the presser foot base (1) is located is 0° to 45°. The inlet of the dust suction pipe (13) is placed near the press nose (6).

5. The pressure foot unit for a rivet according to claim 1, characterized in that: The middle of the presser foot extension plate (4) is connected to the press nose (6). A hole is provided at the center of the press nose (6), and an upper riveting die (3) is provided on the same axis. A tool lubrication and cooling device (10) is provided on the presser foot extension plate (4).

6. The pressure foot unit for a rivet according to claim 1, characterized in that: An upper riveting skin chip blowing device (16) is provided outside the presser foot base (1). The upper riveting skin chip blowing device (16) includes a support column and a chip blowing head. The chip blowing head is inclined towards the upper riveting die (3) and has a narrow and long opening.

7. A pressure foot unit for a rivet according to claim 1, characterized in that: A rivet discard device (14) is provided on one side of the middle of the presser foot base (1).

8. A pressure foot unit for a rivet according to claim 1, characterized in that: An outer edge plate is provided on one side of the middle of the presser foot base (1). A broken tool detection device (11) and a chip entanglement removal device at the tool tip (12) are arranged facing the press nose (6) on the outer edge plate.

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