Pressure foot unit for rivet

Abstract

The invention discloses a pressure foot unit for rivets, and belongs to the technical field of drilling and riveting machines. The pressure foot unit comprises a pressure foot base, a driving assembly and a monitoring device, the driving assembly and the monitoring device are arranged in the pressure foot base, and the driving assembly is composed of a driving air cylinder, a pressure foot extending plate and a pressure nose and can achieve the pressing function. The monitoring device is provided with a laser displacement sensor, a pressure sensor, a presser foot inner cavity monitor, an infrared distance measuring device and a broken cutter detection device, and the position of a presser foot, a pressure value and the condition of rivets in the presser foot inner cavity can be fed back in real time. In addition, a gluing device, a cutter lubricating and cooling device, a cleaning device and the like are further arranged in the inner cavity of the presser foot base. According to the invention, the presser foot unit is highly integrated in design and concise in layout, and integrates a pressing function, a normal detection function, a broken knife detection function, a gluing function, dust removal, chip suction and the like.

Description

Technical Field

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

[0002] Automatic drilling and riveting machine is an automated equipment that completes the workpiece positioning, clamping, hole making, nail feeding, riveting and other process in one go. The drilling and riveting process is indispensable in the manufacturing of aircraft parts and wall panels due to its advantages such as high connection strength, good connection stability and adaptability to complex structures.

[0003] The pressure foot unit is located at the end of the upper rivet head main unit and can perform drilling and riveting operations. The pressure foot unit integrates an actuator, a monitoring device and a cleaning device, and is equipped with multiple workstations. The installation position of the measuring system is often different from the working position of the actuator. Therefore, the pressure foot unit is either moved as a whole for drilling and riveting operations, such as patent number CN119077376A, or a mobile measuring system is used. Although the mobile measuring system avoids the overall movement of the pressure foot unit, due to the addition of an additional workstation, the layout of the inner cavity of the pressure foot is more complicated, and interference is easily generated between workstations, affecting the parallel operation of each workstation. Summary of the invention

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

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: A pressure foot unit for rivets comprises a pressure foot base and a driving cylinder therein, wherein the pressure foot base is a concave plate, 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 sideways-tilted gluing device is provided in the inner cavity of the pressure foot base, the injection port of the gluing device is placed near the pressure nose, and a laser displacement sensor is embedded in the pressure foot base. The pressure foot unit adopts a highly integrated design, integrating the functions of clamping, normal detection, and gluing. The concave design can miniaturize the pressure foot unit as a whole in the longitudinal direction and generate a relatively flat boundary, which is conducive 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 is working, 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. It can accurately measure the position, displacement, and other changes of the measured object without contact. Here, the laser displacement sensor can provide real-time feedback on 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 interference with the product, and matches the high-precision, high-response laser displacement sensor to improve the accuracy and efficiency of normal detection.

[0006] Specifically, there are at least two laser displacement sensors. When the presser foot extension plate is extended, there may be a slight tilt. The laser displacement sensors can be set to four and symmetrically arranged around the presser foot extension plate to provide real-time feedback on the displacement and tilt angle of the presser foot extension plate, detect whether the drive assembly is driven synchronously, and make adjustments based on the feedback to prevent the rivet from loosening or tilting due to the tilt of the presser foot extension plate, thereby further improving the quality of the product.

[0007] Specifically, the two ends of the concave surface of the presser foot base are flat, connected to the middle of the concave surface by an inclined plate, the angle between the inclined plate and the horizontal plane is 20°~50°, and pressure sensors are provided at the two ends of the concave surface, and the upper surface of the pressure sensor is in contact with the component above the pressure foot unit. The angle between the inclined plate of the presser foot base 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, the 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. When drilling and riveting, the pressure nose contacts the skin and is subjected to an upward force, and the presser foot base is compressed. The pressure sensor on the presser foot base can detect the size of the pressure on it, which is used to determine whether the presser foot is in a compressed state, thereby improving product quality and efficiency.

[0008] The inner cavity of the presser foot base is provided with an infrared distance measuring device and a presser foot inner cavity monitoring device. The infrared distance measuring device is used to detect the extension length of the rivet and the distance between the rivet and the skin; the presser foot inner cavity monitoring device is used to detect the extension of the presser foot extension plate and the conditions of the cutter and entangled chips inside the presser foot base.

[0009] The inner cavity of the presser foot base is provided with a dust suction pipe, which is a straight-cylinder type, and the angle between its axis and the plane where the concave surface of the presser foot base is located is 0°~45°, and the entrance of the dust suction pipe is placed near the nose of the presser foot. The presser foot unit integrates the functions of dust suction and chip removal. The dust suction pipe is set to be a straight-cylinder type to solve the problem of too few maintenance points of the dust suction pipe due to the large number of pipe elbows, and prevent the dust suction pipe from being blocked by chips. 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 runs through the presser foot base, one section is in the inner cavity of the presser foot base, and the other section is 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°, so as to avoid interference between the dust suction pipe and other components inside the presser foot and save the internal space of the presser foot unit.

[0010] The middle part of the presser foot extension plate is connected to the presser nose, a hole is arranged at the center of the presser nose, an upper riveting die is arranged on the same axis, and a tool lubricating and cooling device is arranged on the presser foot extension plate. The coaxial upper riveting die and the gluing device of the side axis move to the vicinity of the hole of the presser nose during operation. The tool lubricating and cooling device can move up and down with the presser foot extension plate to cool and lubricate the tool.

[0011] An upper riveted skin chip blowing device is provided on the outer side of the presser foot base, and the upper riveted skin chip blowing device includes a support column and a chip blowing head, and the chip blowing head is tilted and arranged facing the upper riveting die, and the opening is narrow and long. The upper riveted skin chip blowing device can clean the processed skin surface, the chip blowing head is tilted and the angle is adjustable, which is convenient for operation, and the narrow and long opening can avoid interference and increase the chip blowing area.

[0012] Preferably, a rivet discarding device is provided on one side of the middle part of the presser foot base, so as to facilitate the recycling of rivets and improve the drilling and riveting efficiency.

[0013] Preferably, an outer edge plate is provided on one side of the middle part of the presser foot base, and a knife breakage detection device and a knife tip entanglement removal device are arranged on the outer edge plate 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 difficulty of manufacturing the pressure foot assembly, the knife breakage detection device and the knife tip entanglement removal device are arranged on the outer edge plate of the presser foot base, thereby increasing the knife breakage detection and entanglement removal functions and improving the working efficiency of the drilling and riveting machine.

[0014] The beneficial effects of the present invention are as follows: the design of the presser foot unit is highly integrated, integrating the pressing function, monitoring function, gluing function, dust removal and debris collection, etc. The micro-motion presser foot design can avoid the overall movement of the pressure foot or the interference between the workstations in the pressure foot. The monitoring device includes a laser displacement sensor, a pressure sensor, a presser foot inner cavity monitoring, an infrared ranging device and a broken knife detection device, which can provide real-time feedback on the presser foot position, pressure value and the condition of the rivets in the presser foot cavity, thereby improving the drilling and riveting efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] Figure 1 The figure is a schematic diagram of the internal structure of a pressure foot unit for rivets according to the present invention.

[0017] Figure 2 The figure is a schematic diagram of the appearance of a pressure foot unit for rivets according to the present invention.

[0018] Figure 3 The present invention is a cross-sectional view of a rivet pressure foot unit.

[0019] Explanation of the reference numerals: 1-presser foot base; 2-driving cylinder; 3-upper rivet die; 4-presser foot extension plate; 5-laser displacement sensor; 6-presser nose; 7-pressure sensor; 8-glue coating device; 9-infrared ranging device; 10-tool lubrication and cooling device; 11-knife breakage detection device; 12-knife tip chip removal device; 13-dust suction pipe; 14-rivet discarding device; 15-presser foot inner cavity monitoring; 16-upper rivet skin chip blowing device. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0022] Embodiment 1 A presser foot unit for rivets comprises a presser foot base 1 and a driving cylinder 2 therein. The presser foot base 1 is a concave plate, and 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 tilted gluing device 8 is provided in the inner cavity of the presser foot base 1, and the injection port of the gluing device 8 is placed near the press nose 6. A laser displacement sensor 5 is embedded in the presser foot base 1. The pressure foot unit adopts a highly integrated design, integrating the functions of pressing, normal detection, and gluing. The concave design can miniaturize the pressure foot unit as a whole in the longitudinal direction and generate a relatively flat boundary, which is conducive 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 is working, 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 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. It can accurately measure the position, displacement, and other changes of the measured object without contact. Here, the laser displacement sensor 5 can provide real-time feedback on 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 interference with the product, and matches the high-precision, high-response laser displacement sensor 5 to improve the accuracy and efficiency of normal detection.

[0023] Specifically, there are at least two laser displacement sensors 5. When the presser foot extension plate 4 is extended, there may be a slight tilt. The laser displacement sensors 5 can be set to four, symmetrically arranged around the presser foot extension plate 4, to provide real-time feedback on the displacement and tilt angle of the presser foot extension plate 4, detect whether the driving assembly is driven synchronously, and make adjustments based on the feedback to prevent the rivet from loosening or tilting due to the tilt of the presser foot extension plate 4, thereby further improving the quality of the product.

[0024] Specifically, the two 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 angle between the inclined plate and the horizontal plane is 20°~50°, and pressure sensors 7 are provided at both ends of the concave surface, and the upper surface of the pressure sensor 7 is in contact with the component above the presser foot unit. The 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, the area of ​​the interior 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. When drilling and riveting, the pressure nose 6 contacts the skin and is subjected to an upward force, and the presser foot base 1 is compressed. The pressure sensor 7 on the presser foot base 1 can detect the size of the pressure on it, which is used to determine whether the presser foot is in a compressed state, thereby improving product quality and efficiency.

[0025] The inner cavity of the presser foot base 1 is provided with an infrared distance measuring device 9 and a presser foot inner cavity monitoring 15. The infrared distance measuring device 9 is used to detect the extension length of the rivet and the distance between the rivet and the skin; the presser foot inner cavity monitoring 15 is used to detect the extension of the presser foot extension plate 4 and the conditions of the cutter and entanglement of the inner part of the presser foot base 1.

[0026] The inner cavity of the presser foot base 1 is provided with a dust suction pipe 13, which is a straight-cylindrical type, and the angle between its axis and the plane where the concave surface of the presser foot base 1 is located is 0°~45°, and the inlet of the dust suction pipe 13 is placed near the press nose 6. The presser foot unit integrates the dust suction and chip removal functions, and the dust suction pipe 13 is set to be a straight-cylindrical type to solve the problem of too few maintenance points of the dust suction pipe due to the large number of pipe elbows, and prevent the dust suction pipe from being blocked by chips. When the angle between the axis of the dust suction tube 13 and the plane where the concave surface of the presser foot base 1 is located is 0°, due to the limitation of the geometric shape of the presser foot base 1, the dust suction tube 13 passes through the presser foot base 1, one section is in the inner cavity of the presser foot base 1, and the other section is on the outside of the presser foot base 1; the angle between the axis of the dust suction tube 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°, so as to avoid interference between the dust suction tube 13 and other components inside the presser foot and save the internal space of the presser foot unit.

[0027] The middle part of the presser foot extension plate 4 is connected to the press nose 6, a hole is provided in the center of the press nose 6, an upper riveting die 3 is provided on the same axis, and a tool lubricating and cooling device 10 is provided on the presser foot extension plate 4. The coaxial upper riveting die 3 and the side axis glue coating device 8 move to the vicinity of the hole of the press nose 6 during operation. The tool lubricating and cooling device 10 can move up and down with the presser foot extension plate 4 to cool and lubricate the tool.

[0028] An upper rivet skin chip blowing device 16 is provided on the outer side of the presser foot base 1, and the upper rivet skin chip blowing device 16 includes a support column and a chip blowing head, and the chip blowing head is tilted toward the upper rivet die 3, and the opening is narrow and long. The upper rivet skin chip blowing device 16 can clean the processed skin surface, the chip blowing head is tilted and the angle is adjustable, which is convenient for operation, and the narrow and long opening can avoid interference and increase the chip blowing area.

[0029] Preferably, a rivet discarding device 14 is provided on one side of the middle part of the presser foot base 1 to facilitate the recycling of rivets and improve the drilling and riveting efficiency.

[0030] Preferably, an outer edge plate is provided on one side of the middle part of the presser foot base 1, and a knife-breakage detection device 11 and a knife-tip entanglement removal device 12 are arranged on the outer edge plate facing the press nose 6. The pressure foot unit has a compact structure. In order to prevent interference between the internal parts of the pressure foot and reduce the difficulty of manufacturing the pressure foot assembly, the knife-breakage detection device 11 and the knife-tip entanglement removal device 12 are arranged on the outer edge plate of the presser foot base 1, thereby increasing the knife-breakage detection and entanglement removal functions and improving the working efficiency of the drilling and riveting machine.

[0031] It should be noted that the terms used in this application are only for describing specific embodiments, rather than limiting the scope of this application. As shown in the specification of this application, unless the context clearly indicates an exception, the words "one", "a", "a kind of" and / or "the" do not specifically refer to the singular, but may also include the plural. The terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method or device. In the absence of further restrictions, the elements defined by the statement "include one..." do not exclude the presence of other identical elements in the process, method or device including the elements.

[0032] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the 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.

[0033] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention. This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A rivet presser foot unit, comprising a presser foot base (1) and a driving cylinder (2) therein, characterized in that: The presser foot base (1) is a concave plate, and 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 presser nose (6) located outside the presser foot base (1), the driving cylinder (2) is connected to the presser foot extension plate (4), the inner cavity of the presser foot base (1) is provided with a laterally tilted glue coating device (8), the injection port of the glue coating device (8) is located near the presser nose (6), and the presser foot base (1) is embedded with a laser displacement sensor (5).

2. A rivet pressure foot unit 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. A rivet pressure foot unit according to claim 1, characterized in that: The two 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 an inclined plate, and the angle between the inclined plate and the horizontal plane is 20° to 50°.

4. A rivet pressure foot unit according to claim 1, characterized in that: Pressure sensors (7) are provided at both ends of the presser foot base (1), and the upper surface of the pressure sensor (7) is in contact with the component above the pressure foot unit.

5. A rivet pressure foot unit according to claim 1, characterized in that: The inner cavity of the presser foot base (1) is provided with an infrared distance measuring device (9) and a presser foot inner cavity monitoring device (15).

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

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

8. A rivet pressure foot unit according to claim 1, characterized in that: An upper rivet skin chip blowing device (16) is provided on the outer side of the presser foot base (1), and the upper rivet skin chip blowing device (16) comprises a support column and a chip blowing head, and the chip blowing head is arranged obliquely facing the upper riveting die (3) and has a narrow and long opening.

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

10. A rivet pressure foot unit 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), and a knife breakage detection device (11) and a knife tip entanglement removal device (12) are arranged on the outer edge plate facing the presser nose (6).

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