Rotary-pulling rivet mounting tool

Abstract

The invention discloses a spin-pull rivet mounting tool which comprises a gun head, an oil cylinder executing mechanism and a spin-pull executing mechanism, wherein the gun head is used for riveting a spin-pull rivet fastener through extrusion; the oil cylinder executing mechanism and the spin-pull executing mechanism are used for driving the gun head to extrude and rivet; the gun head comprises an anvil driven by an oil cylinder executing mechanism and a rotary pulling head which is matched with the anvil to achieve riveting extrusion and is driven by a rotary pulling executing mechanism to be connected with a rotary pulling rivet in a rotary pulling mode through a screw. An anvil and a rotary pull head of the gun head, and an oil cylinder executing mechanism and a rotary pull executing mechanism are arranged in the same axial direction; the oil cylinder executing mechanism is of an annular oil cylinder driving structure and comprises an inner cylinder body, an outer cylinder body and an annular piston, wherein the inner cylinder body and the outer cylinder body are matched in a sleeved mode, and the annular piston is hydraulically driven between the inner cylinder body and the outer cylinder body. The front end of the annular piston is in driving connection with the gun head anvil. The rotary-pulling rivet mounting tool is driven by a motor, the whole riveting system can be greatly simplified, the weight of the tool is further reduced, and the riveting mounting efficiency is improved; the mounting tool is compact in structure, convenient to operate and high in efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of riveting and fastening, in particular to the technical field of design and production of hydraulic riveting tools, and particularly relates to a rotary rivet installation tool. Background Art

[0002] The application of rotary-type ring groove rivets in railway freight cars, mining machinery, freight trucks and other industries is becoming more and more widespread, playing a vital role in the connection of certain key components. However, in the actual use of current rotary riveting tools, due to the need to simultaneously connect multiple pipelines, such as air pipes, hydraulic oil pipes, signal lines, etc., the convenience and economy of the tools are obviously insufficient, which reduces the production efficiency. In order to solve this problem and in line with market demand, it is particularly important to develop a hydraulic rotary rivet gun with an electric rotary device. Summary of the invention

[0003] The present invention discloses a rotary rivet installation tool based on the deficiencies of the prior art. The present invention aims to provide a rotary rivet installation tool which is convenient to operate and highly efficient.

[0004] The present invention is achieved through the following technical solutions:

[0005] A pull rivet installation tool, characterized in that it includes a gun head for riveting pull rivet fasteners by extrusion, and a cylinder actuator and a pull actuator for driving the gun head for extrusion riveting; the gun head includes an anvil driven by the cylinder actuator, and a pull head that cooperates with the anvil to achieve riveting extrusion and is driven by the pull actuator to pull the rivet through a spiral connection; the anvil and pull head of the gun head, the cylinder actuator and the pull actuator are arranged in the same axial direction.

[0006] The cylinder actuator of the present invention is an annular cylinder drive structure, comprising an inner cylinder body, an outer cylinder body and an annular piston hydraulically driven between the inner cylinder body and the outer cylinder body; the front end of the annular piston is connected to the gun head anvil drive.

[0007] The rotary-pull actuator described in the present invention comprises: a brushless motor, a gear pair, a front limit Hall, a rear limit Hall, a rivet probe rod, a rotary drive shaft, and a reset spring; the brushless motor is arranged at the rear end of the outer cylinder body of the cylinder actuator, and is driven and matched with the rotary drive shaft through the gear pair; the rotary drive shaft is a hollow driving round rod, arranged along the axial center, and the front outer periphery is an outer hexagonal structure and extends into the inner hexagonal hole at the center of the rear end of the rotary pull head for driving and fixing; the rivet probe rod is a round rod structure, the front end passes through the center hole of the rotary drive shaft and is located on the end face of the rotary pull head, an annular step is arranged in the middle and a reset spring is mounted on the rear round rod, and front limit Hall and rear limit Hall switches for opening and closing the rotary-pull actuator are arranged at intervals on the moving stroke at the rear end of the rivet probe rod.

[0008] Furthermore, the rear end face of the rotary pull head and the front end face of the inner cylinder body can be rotatably and slidably matched, and a limiting step larger than the diameter of the main body is provided at the rear end of the rotary pull head and the front end of the inner cylinder body. After the end faces of the two limiting steps are rotatably and slidably combined, they are located in a C-shaped rotary pull head connecting sleeve with a limiting structure.

[0009] Furthermore, the brushless motor is provided with a motor gear and forms a reduction gear pair with a large gear provided on the rotating drive shaft.

[0010] Furthermore, the oil cylinder actuator, the rotary-pull actuator, and the front limit Hall switch and the rear limit Hall switch of the rotary-pull actuator are all connected to the handle switch signal of the installation tool through the controller.

[0011] Furthermore, the outer peripheries of the middle and rear ends of the rotating drive shaft are rotatably matched with the inner cylinder body through the provided rotating bearings.

[0012] Furthermore, the annular piston is threadedly connected to the anvil through an anvil connecting seat and driven axially, and the inner peripheral wall of the anvil connecting seat is slidably matched with the outer peripheral wall of the rotary pull head connecting sleeve.

[0013] Existing rotary riveting tools all use a combination of pneumatic rotary pull devices and hydraulic tools. During installation, the riveting tool requires additional air source support; secondly, the tool is heavy and cannot be hand-held; the existing rotary riveting tool system is relatively complex, and the workload of subsequent maintenance and repair is large. The present invention designs a set of rotary pull devices driven by a motor, which can greatly simplify the entire riveting system, further reduce the weight of the tool, and improve the installation efficiency of riveting. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the rotary rivet installation tool of the present invention;

[0015] Figure 2 Schematic diagram of the rotary rivet of the present invention;

[0016] Figure 3 It is a schematic diagram of the cross-sectional structure of the installation tool of the present invention;

[0017] Figure 4 It is a schematic diagram of the rotary pull mechanism of the installation tool of the present invention;

[0018] Figures 5 to 7 It is a schematic diagram of the rivet screwing process during installation of the installation tool of the present invention;

[0019] Figures 8 to 10 It is a schematic diagram of the riveting and de-riveting process during the installation of the installation tool of the present invention;

[0020] Figure 11 to Figure 12 It is a schematic diagram of the rivet unscrewing process during installation of the installation tool of the present invention.

[0021] In the figure, 1 is anvil, 2 is rotary pull head, 3 is limit step, 4 is rotary pull head connecting sleeve, 5 is inner cylinder, 6 is outer cylinder, 7 is piston, 8 is large gear, 9 is front limit Hall, 10 is rear limit Hall, 11 is protective cover, 12 is brushless motor, 13 is protective cover, 14 is reset spring, 15 is motor gear, 16 is bearing, 17 is signal line, 18 is handle, 19 is high pressure return oil pipe, 20 is high pressure inlet oil pipe, 21 is switch, 22 is bearing, 23 is rotating drive shaft, 24 is rivet probe, 25 is anvil connecting seat;

[0022] 31 is a cap head, 32 is a locking ring groove, 33 is a rotary groove, and 34 is a collar;

[0023] A is the gun head, B is the cylinder actuator, C is the rotary actuator, and D is the gun handle. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0025] Combined with the attached pictures.

[0026] The installation tool of the invention is used for installing a rotating pull ring groove rivet.

[0027] like Figure 2 As shown, the pull-ring groove rivet pair consists of a pull-ring groove rivet and a collar, including a cap head 31, a locking ring groove 32, a pull-ring groove 33, and a collar 34, wherein the pull-ring groove 33 is a standard thread, for example: the thread specifications of the pull-ring grooves of M16 and M20 are M16 and M20 respectively.

[0028] The installation method of the pull rivet is somewhat different from the common short tail type or pull-off type ring groove rivet. Figures 5 to 12 , the entire riveting installation process can be divided into the following main steps: rivet screwing, such as Figures 5 to 7 As shown; riveting and unriveting, such as Figures 8 to 10 As shown; rotate out, as Fig.11 , Fig.12 shown.

[0029] like Figure 1 As shown, the rotary riveting tool of this embodiment is a complete riveting system tool, including: a gun head A, a cylinder actuator B, a rotary actuator C, an auxiliary hydraulic oil pipe, a power cord and a switch arranged on the gun handle D.

[0030] Figure 1: is a schematic diagram of the rotary rivet installation tool of this embodiment. The rotary riveting tool is arranged axially as a whole. The rotary actuator C is placed at the rear end of the gun body. Its appearance is consistent with the cylinder actuator B, ensuring the coordination and compactness of the overall appearance of the tool. At the same time, the shell material of the cylinder actuator B is optimized with lightweight materials such as aluminum alloy or plastic, which effectively reduces the overall weight of the tool and improves the convenience of operation.

[0031] The rotary riveting tool adopts a modular split design, which not only greatly facilitates subsequent maintenance work, such as lubrication of gears and bearings, inspection of motor drive circuits, etc., but also effectively improves the overall stability and durability of the tool.

[0032] like Figure 3 and Figure 4 As shown, the core function of the rotary pull actuator C is to quickly and efficiently screw the rivet into the rotary pull head 2 and withstand the reaction force generated by the riveting force during the riveting process. In order to ensure the stable function of its function, the structure needs to have corresponding tensile strength and accurately control the depth of the rotary pull rivet entering the rotary pull head. The rotary pull actuator structure C includes: a brushless motor 12, a gear pair, a front limit Hall 9, a rear limit Hall 10, a rivet probe 24, a rotating drive shaft 23, a reset spring 14 and a connected rotary pull head 2.

[0033] The structure of the installation tool of this embodiment is described below:

[0034] The brushless motor 12 is fixed to the protective cover 13 by bolts, and the axial direction of the brushless motor 12 is parallel to the axial direction of the tool cylinder and staggered by a certain distance. The protective cover 13 is also fixed to the inner cylinder body 5 by bolts, and the inner cylinder body 5 is connected to the outer cylinder body 6 by threads. At this time, the outer cylinder body 6 can be regarded as the frame of the entire rotary pulling device. The large gear 8 is installed on the rotating drive shaft 23, and the two are connected by a key connection or interference fit. The motor gear 15 and the large gear 8 are a pair of reduction gear pairs, and the reduction ratio is 3.83 and the center distance is 30.1mm. The front limit Hall 9 and the rear limit Hall 10 are fixed to the protective cover 13 in the axial direction of the tool in sequence, and the distance between the two is related to the standard thread length on the rotary rivet.

[0035] The rotating drive shaft 23 passes through the center hole of the inner cylinder 5 and is inserted into the inner part of the rotary pull head 2 to a certain depth, and the end of the rotating drive shaft 23 is an outer hexagon, and the end of the rotary pull head 2 that is connected to the rotating drive shaft 23 is an inner hexagon. A ball bearing 22 and a bearing 16 are respectively arranged at the front and rear ends of the inner hole of the piston to support the rotating movement of the rotating drive shaft 23 to reduce the friction resistance during its rotation. The rivet probe 24 is used to detect the screw-in depth of the rivet into the rotary pull head 2. The rivet probe 24 is located in the inner hole of the rotating drive shaft 23, and a reset spring 14 is installed between the tail of the rotating drive shaft 23 and the rivet probe 24. The joint of the rotary pull head 2 and the inner cylinder 5 is provided with a limiting step 3 of a circular ring structure, and the end faces of the two limiting steps 3 can be rotatably slidably combined, and the rotary pull head 2 and the inner cylinder 5 are limited and rotatably combined through a rotary pull head connecting sleeve 4 with a C-shaped cross section. The rotary pull head 2 can rotate inside the rotary pull head connecting sleeve 4 under the drive of the rotating drive shaft 23. The anvil 1 is threadedly connected to the anvil connecting seat 25 via threads, and the anvil connecting seat 25 is threadedly connected to the inner cylinder body 7.

[0036] like Figure 4 As shown, the rotary drive shaft 23 is equipped with a rivet probe 24, and the rear end of the probe 24 is installed with the front limit Hall 9 and the rear limit Hall 10 switches. The distance between the two limit Hall induction switches can accurately reflect and control the depth of the rotary rivet entering the rotary pull head. During the rivet screwing process, the rivet probe 24 is always supported by the rivet and moves backward. Once the rear limit Hall 10 induction switch senses the rivet probe 24, the brushless motor 12 immediately stops running and starts the hydraulic pump to perform the riveting operation. In addition, a reset spring 14 is also arranged between the rivet probe 24 and the rotary drive shaft 23. In the process of the rivet gradually entering the rotary pull head 2, the reset spring 14 will be compressed accordingly until the rivet probe 24 touches the rear limit Hall 10 switch. The distance between the limit Hall switches just corresponds to the maximum compression space that the reset spring 14 can reach.

[0037] The entire operation process of the installation tool in this embodiment is described below:

[0038] like Figures 5 to 7 As shown, when installing the spin rivet, first press the switch 21 of the tool, and at the same time apply moderate force to insert the gun head into the spin rivet and maintain close contact. At this time, the brushless motor 12 drives the motor gear 15 to rotate, and the large gear 8 follows the rotation. The large gear 8 is connected to the rotating drive shaft 23 through a key. The rotating drive shaft also rotates and drives the spin pull head 2 to rotate, and the rivet tail tooth is screwed into the spin pull head 2.

[0039] During the screwing process of the rivet, the tail of the rivet presses against the rivet probe 24 and causes it to move backward along the axial direction until the rivet probe 24 senses the rear limit Hall 10, at which time the brushless motor 12 stops rotating immediately.

[0040] like Figures 8 to 10 As shown, the brushless motor 12 stops rotating immediately, and the hydraulic pump station starts to start and starts to inject high-pressure oil into the tool cylinder. As the high-pressure oil is injected, the piston 7 will move toward the gun head, thereby pushing the anvil 1 to apply pressure to the collar, causing it to undergo plastic deformation. When the hydraulic oil pressure reaches the set value, the high-pressure hydraulic oil will push the piston 7 to move in the opposite direction, thereby separating the anvil 1 from the collar.

[0041] After riveting is completed, Fig.11 , Fig.12 As shown, when the piston 7 is completely returned to the initial position, the hydraulic pump station motor will stop running. At this time, the brushless motor 12 will start to rotate in the reverse direction until the front limit Hall 9 senses the rivet probe 24. At this time, the brushless motor 12 stops running after a delay of 1.5 seconds to ensure that the pull head 2 is completely screwed out of the rivet.

[0042] At this point, the entire installation process of the entire pull rivet is completed.

Claims

1. A pull rivet installation tool, characterized in that: It comprises a gun head for riveting a rivet fastener by extrusion, and a cylinder actuator and a rotary actuator for driving the gun head for extrusion riveting; the gun head comprises an anvil driven by the cylinder actuator, and a rotary head which cooperates with the anvil to achieve riveting extrusion and is driven by the rotary actuator to be rotary-connected with the rivet through a spiral; the anvil and the rotary head of the gun head, the cylinder actuator and the rotary actuator are arranged in the same axial direction.

2. The pull rivet installation tool according to claim 1, characterized in that: The cylinder actuator is an annular cylinder drive structure, including an inner cylinder body and an outer cylinder body that fit together and an annular piston that is hydraulically driven between the inner cylinder body and the outer cylinder body; the front end of the annular piston is drive-connected to the gun head anvil.

3. The pull rivet installation tool according to claim 2, characterized in that: The rotary-pull actuator comprises: a brushless motor, a gear pair, a front limit Hall, a rear limit Hall, a rivet probe rod, a rotary drive shaft, and a reset spring; the brushless motor is arranged at the rear end of the outer cylinder body of the oil cylinder actuator, and is driven and matched with the rotary drive shaft through the gear pair; the rotary drive shaft is a hollow driving round rod, arranged along the axial center, and the front outer periphery is an outer hexagonal structure and extends into the inner hexagonal hole at the center of the rear end of the rotary pull head for driving and fixing; the rivet probe rod is a round rod structure, the front end passes through the center hole of the rotary drive shaft and is located on the end face of the rotary pull head, an annular step is arranged in the middle and a reset spring is mounted on the rear round rod, and the front limit Hall and rear limit Hall switches for opening and closing the rotary-pull actuator are arranged at intervals on the moving stroke at the rear end of the rivet probe rod.

4. The pull rivet installation tool according to claim 3, characterized in that: The rear end face of the rotary pull head and the front end face of the inner cylinder body can be rotatably and slidably matched, and a limiting step larger than the diameter of the body is provided at the rear end of the rotary pull head and the front end of the inner cylinder body. After the end faces of the two limiting steps are rotatably and slidably combined, they are located in a C-shaped rotary pull head connecting sleeve with a limiting structure.

5. The pull rivet installation tool according to claim 3, characterized in that: The brushless motor is mounted with a motor gear and forms a reduction gear pair with a large gear mounted on the rotating drive shaft.

6. The pull rivet installation tool according to claim 3, characterized in that: The oil cylinder actuator, the rotary-pull actuator, and the front limit Hall switch and the rear limit Hall switch of the rotary-pull actuator are all connected with the handle switch signal of the installation tool through the controller.

7. The pull rivet installation tool according to claim 3, characterized in that: The outer peripheries of the middle and rear ends of the rotary drive shaft are rotatably matched with the inner cylinder body through the provided rotary bearings.

8. The pull rivet installation tool according to claim 4, characterized in that: The annular piston is threadedly connected to the anvil through the anvil connecting seat and driven in the axial direction, and the inner peripheral wall of the anvil connecting seat is slidably matched with the outer peripheral wall of the rotary pull head connecting sleeve.

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