A rotatable riveting head with force sensor

Abstract

The utility model is applicable to the technical field of riveting of aviation parts, and provides a rotatable riveting head with force value sensing, including an outer shell, a riveting mechanism rotatably installed inside the outer shell, and a force transmission mechanism installed between the riveting mechanism and the outer shell; the riveting mechanism includes a movable rod rotatably sleeved inside the outer shell, a connecting body is installed at the bottom of the movable rod, and a rotating disk is installed at the bottom of the connecting body; the movable rod is transmission-connected to the output end of the power device; the force transmission mechanism includes a thrust roller bearing sleeved inside the outer shell; a force value sensor is installed inside the outer shell; a spring is installed between the end of the thrust roller bearing away from the rotating disk and the force value sensor. Thereby, the device can solve the problem of unreliable riveting through a rotatable riveting head with force value sensing; and prevent the problem of unreliable riveting stroke caused by partial deformation or wear of the riveting machine in contact with the rivet.

Description

Technical Field

[0001] The utility model is applicable to the technical field of riveting of aviation parts and provides a rotatable riveting head with force value sensor. Background Art

[0002] In the current docking and assembly of aircraft parts, riveting of parts is an important part of the whole machine assembly. The characteristics of riveting of parts are that there are many sizes and specifications of parts, and there are certain step differences. The required force value usually has an interval value requirement. The positions of the holes that need to be coordinated for riveting are widely distributed and relatively sporadic, and the interchangeability and rapid operability are required to be high.

[0003] At present, in the riveting technology of aircraft parts, the rivets are deformed by stamping and extrusion to fix the two parts together, and the stamping and extrusion riveting machines usually control the degree of rivet riveting by controlling the movement stroke of the rivet head.

[0004] However, this process will cause many problems. When the riveting machine is working, the head of the riveting machine, that is, the part in contact with the rivet, will deform or wear out in long-term use, which will make the extrusion stroke of the rivet controlled by the displacement control gradually unreliable, and the degree of riveting will decrease. At the same time, because the hardness of the rivet changes with temperature, under low temperature working conditions, the rivet may be squeezed and cracked, or stress cracks may be generated inside, which reduces the reliability of riveting. Utility Model Content

[0005] In view of the above-mentioned defects, the purpose of the utility model is to provide a rotatable riveting head with force value sensing, in order to solve the problems raised in the background technology. The device comprises an outer shell, a riveting mechanism is rotatably installed inside the outer shell, and a force transmission mechanism is installed between the riveting mechanism and the outer shell;

[0006] The riveting mechanism comprises a movable rod rotatably sleeved inside the outer shell, a connector is installed at the bottom of the movable rod, and a rotating disk is installed at the bottom of the connector; the movable rod is transmission-connected to the output end of the power device;

[0007] The force transmission mechanism comprises a thrust roller bearing sleeved inside the outer shell; a force sensor is installed inside the outer shell; and a spring is installed between one end of the thrust roller bearing away from the rotating disk and the force sensor.

[0008] Furthermore, the movable rod is provided with a spur gear portion, the outer shell is provided with a rotating shaft installed on the output end of the power device, the rotating shaft is installed with a power gear, and the power gear is meshed with the spur gear portion.

[0009] Furthermore, a baffle is installed inside the outer shell, and a first through hole and a second through hole are provided on the baffle. The rotating shaft and the movable rod are respectively sleeved inside the first through hole and the second through hole; the outer diameter of the movable rod away from the connecting body is larger than the inner diameter of the second through hole.

[0010] Furthermore, an inner ring groove of the shell is provided inside the outer shell, and the force sensor is installed at the bottom of the inner ring groove of the shell; a sleeve is installed at the end of the thrust roller bearing away from the rotating disk, and a sleeve annular groove is provided on the sleeve, and the two ends of the spring are respectively arranged in the sleeve annular groove and the inner ring groove of the shell.

[0011] Furthermore, a plurality of slide grooves are provided on the inner surface of the inner ring groove of the shell, and a limit block matching the position of the slide groove is provided on the sleeve.

[0012] Furthermore, a second abutment sheet is fixedly connected to one end of the thrust roller bearing close to the rotating disk, and a surface of the second abutment sheet close to the rotating disk is provided with a plurality of circumferentially arranged rows of teeth.

[0013] Furthermore, a first abutment sheet is fixedly connected to one end of the rotating disk close to the thrust roller bearing, and the first abutment sheet is made of rubber.

[0014] Furthermore, a friction plate is installed at one end of the rotating disk away from the thrust roller bearing.

[0015] Furthermore, the movable rod and the connecting body are fixedly connected via a connecting flange.

[0016] To summarize, in actual use, the clamping device on the production line transfers the two riveted parts with the rivets inserted to the lower riveting die and the riveting head for preparation. The power device of the riveting machine starts to run, driving the riveting mechanism to rotate. The riveting mechanism and the rivet are in contact and friction to generate heat, which increases the temperature of the deformed part of the rivet; during the process, when the rotating disk abuts the rivet, it will cause the rotating disk to abut against the thrust roller bearing, pushing the thrust roller bearing upward, compressing the spring and further transmitting the force to the force sensor. The force sensor can convert the pressure received into an electrical signal and transmit it to the control terminal of the riveting machine, thereby realizing the reading of the force value. The riveting machine can control the riveting of the rivets according to the change in force value and the distance of advancement.

[0017] Therefore, the device can solve the problem of unreliable riveting through a rotatable riveting head with force sensor. Force sensor provides a basis for the degree analysis of riveting. It can prevent the problem of unreliable riveting stroke caused by deformation or wear of the part of the riveting machine that contacts the rivet during long-term use. At the same time, the rotary riveting method can make the rivet warm, and under low-temperature working conditions, it can prevent the rivet from being squeezed and cracked or stress cracks from forming inside, thereby increasing the reliability of riveting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the riveted joint structure;

[0019] Figure 2 This is a cross-sectional view of the internal structure of the riveted joint;

[0020] Figure 3 is a cross-sectional view of the outer shell;

[0021] Figure 4 for Figure 2 A magnified view of the structure of part A;

[0022] Figure 5 This is the deformation principle diagram of rivets during riveting;

[0023] In the figure: 01- rivet; 02- riveted parts; 03- lower riveting die; 04- top block;

[0024] 1-outer shell; 11-blocking plate; 111-first through hole; 112-second through hole; 12-through cavity; 13-accommodating cavity; 14-annular groove in shell; 141-slide groove; 2-riveting mechanism; 21-movable rod; 211-straight tooth portion; 212-connecting flange; 22-connecting body; 23-rotating disk; 231-first abutting plate; 232-friction plate; 3-force transmission mechanism; 31-sleeve; 311-sleeve annular groove; 312-limiting block; 32-spring; 33-thrust roller bearing; 34-force sensor; 35-second abutting plate; 4-rotating shaft; 41-power gear. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] See also Figure 1-5 The purpose of the utility model is to provide a rotatable riveting head with force value sensor, including an outer shell 1, a riveting mechanism 2 is installed inside the outer shell 1, and a force transmission mechanism 3 is installed between the riveting mechanism 2 and the outer shell 1. Specifically, the riveting head is installed at the output end of the riveting machine, the riveting head is vertically arranged with the output end facing downward, the riveting machine is also equipped with a top block 04 matching the riveting head, the top block 04 is arranged below the riveting head, a lower riveting die 03 is installed on the top of the top block 04, and a riveted part 02 with a rivet 01 inserted therein can be clamped between the lower riveting die 03 and the riveting head by other clamping devices. The riveting machine can drive the riveting head to move toward the rivet by hydraulic means, and the riveting mechanism 2 on the riveting head makes physical contact with and presses the rivet 01, so that the contacting part is deformed, thereby riveting the two parts.

[0027] The outer shell 1 is a cylindrical structure, and is provided with a through cavity 12 and a receiving cavity 13 communicating with the through cavity 12, and the inner diameter of the receiving cavity 13 is larger than the inner diameter of the through cavity 12. The riveting mechanism 2 includes a connector 22 rotatably connected to the inside of the receiving cavity 13; that is, the connector 22 is arranged in the outer shell 1 and can rotate inside the outer shell 1, and the end of the connector 22 close to the through cavity 12 is fixedly connected to a movable rod 21, and the movable rod 21 is sleeved inside the outer shell 1, and can be displaced to a certain extent along the length direction of the outer shell 1 under the limiting effect of the outer shell 1. The movable rod 21 is in transmission cooperation with the power device inside the riveting machine. The end of the connector 22 away from the movable rod 21 is fixedly connected to a rotating disk 23.

[0028] As a preferred embodiment, the limiting configuration of the outer shell 1 on the movable rod 21 is as follows:

[0029] The baffle 11 is fixedly connected inside the through cavity 12, and the baffle 11 is provided with a first through hole 111 and a second through hole 112. The rotating shaft 4 and the movable rod 21 are respectively sleeved inside the first through hole 111 and the second through hole 112. The rotating shaft 4 and the movable rod 21 can rotate inside the first through hole 111 and the second through hole 112 respectively. At the same time, the outer diameter of the end of the movable rod 21 away from the connecting body 22 is larger than the inner diameter of the second through hole 112, so that the movable rod 21 can be clamped on the baffle 11 to limit the travel of the movable rod 21.

[0030] As a preferred embodiment, the cooperation between the movable rod 21 and the power device is as follows:

[0031] The power device inside the riveting machine can drive the movable rod 21 to rotate, thereby driving the connecting body 22 to rotate. Specifically, the movable rod 21 is provided with a straight tooth portion 211, and the accommodating cavity 13 is provided with a rotating shaft 4 installed on the output end of the power device. The rotating shaft 4 is fixedly connected with a power gear 41, and the power gear 41 is meshed with the straight tooth portion 211, thereby realizing that the movable rod 21 is driven to rotate by the power device.

[0032] The force transmission mechanism 3 includes a thrust roller bearing 33 sleeved inside the outer shell 1. A force sensor 34 is installed inside the outer shell 1; specifically, an inner ring groove 14 is provided inside the outer shell 1, and the force sensor 34 is fixedly connected to the bottom of the inner ring groove 14. The thrust roller bearing 33 is sleeved outside the connecting body 22, and a spring 32 is installed between one end of the thrust roller bearing 33 away from the rotating disk 23 and the force sensor 34.

[0033] In summary, when the rivet 01 is riveted, the hydraulic mechanism of the riveting machine drives the riveting head close to the rivet 01, and the rotating disk 23 first abuts against the deformed part of the rivet 01. At this time, the power device inside the riveting machine is in operation, and the rotating disk 23 abuts against the rivet 01 while rotating at high speed, generating heat to increase the temperature of the deformed part of the rivet 01, and the riveting is completed under the action of continuous pressure. During this action, when the rotating disk 23 abuts against the rivet 01, the riveting mechanism 2, that is, the rotating disk 23, the connector 22 and the movable rod 21 as a whole, moves upward, and the rotating disk 23 abuts against the thrust roller bearing 33. The abutting force compresses the spring 32 and further transmits the force to the force sensor 34. The force sensor 34 can convert the pressure received into an electrical signal and transmit it to the control terminal of the riveting machine, thereby realizing the reading of the force value.

[0034] Preferably, the end of the thrust roller bearing 33 away from the rotating disk 23 is fixedly connected with a sleeve 31, and the sleeve 31 is provided with a sleeve annular groove 311, and the two ends of the spring 32 are respectively arranged in the sleeve annular groove 311 and the housing inner annular groove 14. The sleeve annular groove 311 and the housing inner annular groove 14 simultaneously play a limiting role for the spring 32. The spring 32 is selected to be a high-performance spring with sufficient elastic stiffness, which can ensure that the pressure of the rivet 01 to deform during riveting is less than the pressure limit within the deformation range of the spring 32.

[0035] Preferably, the thrust roller bearing 33 is fixedly connected to one end close to the rotating disk 23 with a second abutment plate 35, and the second abutment plate 35 can abut against the rotating disk 23 when the riveting head is performing riveting work, and the abutting surface between the second abutment plate 35 and the rotating disk 23 is provided with a plurality of circumferentially arranged rows of teeth, and the abutment between the second abutment plate 35 and the rotating disk 23 can make the rotation of the rotating disk 23 fully absorbed by the thrust roller bearing 33, thereby preventing the friction between the contact surfaces of the rotating disk 23 and the thrust roller bearing 33 from causing vibration and causing distortion of the detected force data of the force sensor 34.

[0036] Preferably, one end of the rotating disk 23 close to the thrust roller bearing 33 is fixedly connected with a first abutment piece 231, and the first abutment piece 231 is made of rubber and has a certain softness; the first abutment piece 231 made of rubber can generate sufficiently good friction with the second abutment piece 35, so that the rotation of the rotating disk 23 can be fully transmitted to the thrust roller bearing 33, so that the thrust roller bearing 33 can fully offset the rotation of the rotating disk 23.

[0037] Preferably, the end of the rotating disk 23 away from the thrust roller bearing 33 is fixedly connected with a friction plate 232, and the friction plate 232 is made of a non-glossy wear-resistant ceramic material and has heat resistance. The friction plate 232 is driven to rotate by the rotating disk 23, and can generate friction with the rivet 01. The high-speed rotation of the friction plate 232 makes the deformed end of the rivet 01 more likely to deform, and the deformation is more uniform, which can effectively prevent the rivet tail from deforming and cracking or deformation deviation, making the riveting more reliable. In some embodiments, the friction plate is detachably connected to the rotating disk 23, for example, connected to the rotating disk 23 by bolts, so that the friction plate 232 can be replaced when worn.

[0038] See also Figure 4 Preferably, a plurality of slide grooves 141 are provided on the inner surface of the inner ring groove 14 of the housing, and a limit block 312 matching the position of the slide groove 141 is provided on the sleeve 31, and the limit block 312 is slidably connected inside the slide groove 141. The limit block 312 is embedded inside the slide groove 141 and can slide inside the slide groove 141, thereby limiting the sleeve 31 and preventing the sleeve 31 from rotating.

[0039] Preferably, the movable rod 21 and the connecting body 22 are fixedly connected via a connecting flange 212. This method is more convenient for installation and replacement of equipment parts.

[0040] In summary, in actual use, the clamping device on the production line transfers the two riveted parts 02 with the rivet 01 inserted to between the lower riveting die 03 and the riveting head for preparation. The power device of the riveting machine starts to run, driving the riveting mechanism 2 to rotate. The riveting mechanism 2 and the rivet 01 are in contact and friction to generate heat, and the heat generated causes the temperature of the deformed part of the rivet 01 to rise; during the process, when the rotating disk 23 abuts against the rivet 01, the rotating disk 23 abuts against the thrust roller bearing 33, pushing the thrust roller bearing 33 to move upward, compressing the spring 32 and further transmitting the force to the force sensor 34. The force sensor 34 can convert the pressure received into an electrical signal and transmit it to the control terminal of the riveting machine, thereby realizing the reading of the force value. The riveting machine can control the riveting of the rivet 01 according to the change in force value and the distance of advancement.

[0041] Therefore, the device can solve the problem of unreliable riveting through a rotatable riveting head with force sensor. Force sensor provides a basis for the degree analysis of riveting. It can prevent the problem of unreliable riveting stroke caused by deformation or wear of the part of the riveting machine that contacts the rivet during long-term use. At the same time, the rotary riveting method can make the rivet warm, and under low-temperature working conditions, it can prevent the rivet from being squeezed and cracked or stress cracks from forming inside, thereby increasing the reliability of riveting.

[0042] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A rotatable riveting head with force sensor, characterized in that: It comprises an outer shell (1), a riveting mechanism (2) is rotatably mounted inside the outer shell (1), and a force transmission mechanism (3) is mounted between the riveting mechanism (2) and the outer shell (1); The riveting mechanism (2) comprises a movable rod (21) rotatably sleeved inside the outer shell (1), a connecting body (22) is installed at the bottom of the movable rod (21), and a rotating disk (23) is installed at the bottom of the connecting body (22); the movable rod (21) is transmission-connected to the output end of the power device; The force transmission mechanism (3) comprises a thrust roller bearing (33) sleeved inside the outer shell (1); a force sensor (34) is installed inside the outer shell (1); and a spring (32) is installed between one end of the thrust roller bearing (33) away from the rotating disk (23) and the force sensor (34).

2. The rotatable riveting head with force sensor according to claim 1, characterized in that: The movable rod (21) is provided with a spur gear portion (211), the outer shell (1) is provided with a rotating shaft (4) mounted on the output end of the power device, the rotating shaft (4) is provided with a power gear (41), and the power gear (41) is meshed with the spur gear portion (211).

3. The rotatable riveting head with force sensor according to claim 2, characterized in that: A baffle (11) is installed inside the outer shell (1), and a first through hole (111) and a second through hole (112) are provided on the baffle (11); the rotating shaft (4) and the movable rod (21) are respectively sleeved inside the first through hole (111) and the second through hole (112); and the outer diameter of the end of the movable rod (21) away from the connecting body (22) is larger than the inner diameter of the second through hole (112).

4. The rotatable riveting head with force sensor according to claim 1, characterized in that: The outer shell (1) is provided with an inner ring groove (14) of the shell, and the force sensor (34) is installed at the bottom of the inner ring groove (14) of the shell; a sleeve (31) is installed at one end of the thrust roller bearing (33) away from the rotating disk (23), and a sleeve ring groove (311) is provided on the sleeve (31); two ends of the spring (32) are respectively arranged in the sleeve ring groove (311) and the inner ring groove (14) of the shell.

5. The rotatable riveting head with force sensor according to claim 4, characterized in that: A plurality of slide grooves (141) are provided on the inner surface of the inner ring groove (14) of the housing, and a limit block (312) matching the position of the slide grooves (141) is provided on the sleeve (31).

6. The rotatable riveting head with force sensor according to claim 1, characterized in that: One end of the thrust roller bearing (33) close to the rotating disk (23) is fixedly connected to a second abutment sheet (35), and one side of the second abutment sheet (35) close to the rotating disk (23) is provided with a plurality of circumferentially arranged rows of teeth.

7. The rotatable riveting head with force sensor according to claim 1, characterized in that: One end of the rotating disk (23) close to the thrust roller bearing (33) is fixedly connected with a first abutment sheet (231), and the first abutment sheet (231) is made of rubber.

8. The rotatable riveting head with force sensor according to claim 1, characterized in that: A friction plate (232) is installed at one end of the rotating disk (23) away from the thrust roller bearing (33).

9. The rotatable riveting head with force sensor according to claim 1, characterized in that: The movable rod (21) and the connecting body (22) are fixedly connected via a connecting flange (212).

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