Pedal riveting device and method

Abstract

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a pedal riveting device that can prevent the pedal from axially moving during the riveting process, thereby improving the riveting quality. A pedal riveting device includes a frame, the frame is provided with a fixed flat rivet head and a riveting clamp, the riveting clamp is used to clamp the bracket body of the pedal, the fixed flat rivet head is used to axially position the flat end of the riveting pin, and also includes a riveting execution device, the riveting execution device includes a mounting frame, a rivet head is provided on one side of the mounting frame, the rivet head is used to rivet the flipped riveted end of the riveted pin, a cylinder is provided in the mounting frame, the cylinder is connected to the riveting pre-stressing sleeve by power, the riveting pre-stressing sleeve is hollowly sleeved on the rivet head, the riveting pre-stressing sleeve is used to apply pre-stressing pressure to the bracket body, and the frame is also provided with a driving system for driving the riveting execution device to move horizontally and vertically.

Description

Technical Field

[0001] The present invention relates to the technical field of pedals, and in particular to a pedal riveting device and method. Background Art

[0002] The existing pedal riveting device has simple functions, cannot be adjusted in multiple directions, has low riveting efficiency and poor adaptability. Moreover, during the riveting process, the pedal will move axially, affecting the riveting success rate and riveting quality. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a pedal riveting device and method, which can prevent axial movement of the pedal during the riveting process and improve the riveting quality.

[0004] The object of the present invention is achieved like this:

[0005] A pedal riveting device includes a frame, characterized in that: the frame is provided with a fixed flat rivet head and a riveting clamp, the riveting clamp is used to clamp the bracket body of the pedal, the fixed flat rivet head is used to axially position the flat end of the rivet pin, and also includes a riveting execution device, the riveting execution device includes a mounting frame, a rivet head is provided on one side of the mounting frame, the rivet head is used to flip rivet the flipped riveted end of the rivet pin, a cylinder is provided in the mounting frame, the cylinder is dynamically connected to the riveting pre-stressing sleeve, the riveting pre-stressing sleeve is empty on the riveting head, the riveting pre-stressing sleeve is used to apply pre-stressing pressure to the bracket body, and the frame is also provided with a driving system for driving the riveting execution device to move horizontally and vertically.

[0006] Preferably, the mounting frame is rectangular, the cylinder is located in the cavity of the mounting frame, the piston rod of the cylinder extends back to the riveted head and is fixed to the mounting frame, the rear part of the riveted pre-stressing sleeve is provided with a slide groove, the slide groove slides in the side of the mounting frame, and the rear end face of the riveted pre-stressing sleeve is fixed to the cylinder body end of the cylinder, which is used to drive the riveted pre-stressing sleeve to slide axially.

[0007] Preferably, a clamp slide rail is provided on the frame along the axial direction of the riveted head, and the riveting clamp is slidably fitted on the clamp slide rail and fixed by bolts, so that the axial position of the riveting clamp can be adjusted.

[0008] Preferably, the driving system includes a moving frame, a Z-direction screw rod, and a Z-direction servo motor. The moving frame is slidably engaged with a Z-direction guide rail provided on the frame. The Z-direction servo motor is installed on the frame. The Z-direction screw rod and the moving frame form a screw-nut mechanism. One end of the Z-direction screw rod is connected to the Z-direction servo motor for driving the moving frame to move vertically.

[0009] A power bearing seat, a guide seat, and a connecting seat are installed on the movable frame. A power transmission cylinder is supported by a bearing in the power bearing seat and axially positioned. A power screw is matched in the power transmission cylinder to form a screw nut mechanism. The front end of the power screw is connected to the riveting actuator for driving the riveting actuator to move horizontally. The rear end of the power screw is connected to the screw anti-rotation block. A screw anti-rotation guide rail is provided on the guide seat along the axial direction of the power screw. The screw anti-rotation block is slidably matched with the screw anti-rotation guide rail for guiding the axial movement of the power screw and circumferentially limiting the position.

[0010] A power servo motor is installed on the connecting seat, and the power servo motor is connected to the power transmission cylinder in power.

[0011] Preferably, a power transmission cylinder is supported in the power bearing seat by a thrust bearing and a radial bearing. There are two thrust bearings, which are arranged on both sides of the radial bearing.

[0012] Preferably, the power transmission cylinder is provided with a driven synchronous pulley, the power servo motor is connected to the driving synchronous pulley, and the driven synchronous pulley and the driving synchronous pulley are connected by a belt to form a belt transmission mechanism.

[0013] Preferably, a power planetary reducer is connected between the power servo motor and the active synchronous pulley.

[0014] Preferably, the frame is provided with a control system and a touch screen for controlling the operation of the cylinder, the Z-direction servo motor and the power servo motor. An S-type sensor is provided between the power screw and the riveting actuator, and the S-type sensor is connected to the control system signal.

[0015] A pedal riveting method,

[0016] Install the pedal's bracket body on the riveting fixture, align the pedal's arm assembly with the pin hole of the bracket body, and insert the rivet pin;

[0017] Adjust the axial position of the riveting fixture so that the fixed flat rivet head is axially positioned against the flat end of the riveting pin;

[0018] The driving system works, driving the riveting actuator to move vertically, so that the riveting head and the riveting pre-pressing sleeve are aligned with the riveting end of the riveting pin;

[0019] The cylinder works to drive the riveting pre-pressing sleeve to move axially and pass over the front end of the riveting head;

[0020] The driving system works, driving the riveting actuator to move horizontally until the riveting pre-stressing sleeve is pressed against one side of the bracket body. At this time, the riveting pre-stressing sleeve is loosely sleeved on the riveted end of the riveting pin, applying pre-pressure to the bracket body, so that the left and right side walls of the bracket body of the pedal are in close contact with the steps at both ends of the riveting pin;

[0021] The driving system works and continues to drive the riveting actuator to move horizontally. The riveting head overcomes the cylinder pressure and continues to move forward horizontally, flipping the rivet pin into shape.

[0022] Preferably, the riveting speed is controlled by:

[0023] Assume that the measured riveting force is Ft, the set riveting force value is F, the output speed is Vt, and the set riveting speed is V, Vt=V*(1-Ft / F).

[0024] When Ft / F≤2%, the machine moves at a constant speed at the speed of the last calculation.

[0025] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0026] 1. It can prevent the pedal from axial movement during the riveting process, and the riveting quality is higher.

[0027] 2. Multi-directional adjustment, high riveting efficiency and good adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 for Figure 1 Schematic top view of

[0030] Figure 3 for Figure 2 A cross-sectional schematic diagram;

[0031] Figure 4 is a three-dimensional schematic diagram of the present invention;

[0032] Figure 5 Schematic diagram of riveting force changing with displacement.

[0033] Reference numerals

[0034] In the accompanying drawings, 1 is a fixed flat rivet head, 2 is a pedal, 3 is a riveting fixture, 4 is a riveting pre-stressing sleeve, 5 is a riveting head, 6 is a fixture slide rail, 7 is a pre-stressing cylinder, 8 is an S-type sensor, 9 is a power bearing seat, 10 is an end cover (power bearing seat), 11 is a power screw, 12 is a driven synchronous pulley, 13 is a thrust bearing, 14 is a radial bearing, 15 is a Z-direction guide rail, 16 is a power planetary reducer, 17 is a power servo motor, 18 is a screw anti-rotation block, 19 is a screw anti-rotation guide rail, 20 is a Z-direction screw, 21 is a Z-direction servo motor, 22 is a touch screen, and 23 is an active synchronous pulley. DETAILED DESCRIPTION

[0035] See also Figure 1-Figure 4A pedal riveting device includes a frame, a fixed flat rivet head 1 and a riveting clamp 2 are provided on the frame, the riveting clamp 2 is used to clamp the bracket body of the pedal, the fixed flat rivet head 1 is used to axially position the flat end of the rivet pin, and also includes a riveting execution device, the riveting execution device includes a mounting frame, a rivet head 5 is provided on one side of the mounting frame, the rivet head 5 is used to flip rivet the flip riveted end of the rivet pin, a cylinder 7 is provided in the mounting frame, the cylinder 7 is dynamically connected to the riveting pre-stressing sleeve 4, the riveting pre-stressing sleeve 4 is empty on the riveting head 5, the riveting pre-stressing sleeve 4 is used to apply pre-pressure to the bracket body, and a driving system is also provided on the frame for driving the riveting execution device to move horizontally and vertically.

[0036] The mounting frame is rectangular, and the cylinder 7 is located in the cavity of the mounting frame. The piston rod of the cylinder 7 extends back to the riveting head 5 and is fixed to the mounting frame. The rear part of the riveted pre-stressing sleeve 4 is provided with a slide groove, and the slide groove is slidably fitted in the side of the mounting frame. The rear end face of the riveted pre-stressing sleeve 4 is fixed to the cylinder body end of the cylinder 7, which is used to drive the riveted pre-stressing sleeve 4 to slide axially.

[0037] A fixture slide rail 6 is provided on the frame along the axial direction of the riveting head 5 , and the riveting fixture 2 is slidably fitted on the fixture slide rail 6 and fixed by bolts so that the axial position of the riveting fixture 2 can be adjusted.

[0038] The drive system includes a mobile frame, a Z-direction screw rod 20, and a Z-direction servo motor 21. The mobile frame is slidably fitted with a Z-direction guide rail 15 provided on the frame. The Z-direction servo motor 21 is installed on the frame. The Z-direction screw rod 20 and the mobile frame form a screw-nut mechanism. One end of the Z-direction screw rod 20 is power-connected to the Z-direction servo motor 21 for driving the mobile frame to move vertically.

[0039] A power bearing seat 9, a guide seat, and a connecting seat are installed on the movable frame. A power transmission cylinder is supported by a bearing in the power bearing seat 9 and is axially positioned. A power screw 11 is matched in the power transmission cylinder to form a screw nut mechanism. The front end of the power screw 11 is connected to the riveting actuator for driving the riveting actuator to move horizontally. The rear end of the power screw 11 is connected to the screw anti-rotation block 18. A screw anti-rotation guide rail 19 is provided on the guide seat along the axial direction of the power screw 11. The screw anti-rotation block 18 is slidably matched with the screw anti-rotation guide rail 19 to guide the axial movement of the power screw 11 and limit the circumferential position.

[0040] A power servo motor 17 is installed on the connecting seat, and the power servo motor 17 is connected to the power transmission cylinder in a power manner.

[0041] The power transmission cylinder is supported in the power bearing seat 9 by a thrust bearing 13 and a radial bearing 14 . There are two thrust bearings 13 , which are arranged on both sides of the radial bearing 14 .

[0042] The power transmission cylinder is provided with a driven synchronous pulley 12, the power servo motor 17 is connected to the driving synchronous pulley 23, and the driven synchronous pulley 12 and the driving synchronous pulley 23 are connected by a belt to form a belt transmission mechanism.

[0043] A power planetary reducer 16 is connected between the power servo motor 17 and the active synchronous pulley 23 .

[0044] The frame is equipped with a control system and a touch screen 22 for controlling the operation of the cylinder 7, the Z-axis servo motor 21, and the power servo motor 17. An S-shaped sensor 8 is installed between the power screw 11 and the riveting actuator, and the S-shaped sensor 8 is connected to the control system signal. The frame is rectangular, with the lifting device installed on one side of the frame and the touch screen 22 on the other side.

[0045] A pedal riveting method:

[0046] Install the pedal bracket body on the riveting fixture 2, align the pedal arm assembly with the pin hole of the bracket body, and insert the riveting pin;

[0047] Adjust the axial position of the riveting fixture 2 to axially position the flat rivet head 1 against the flat end of the riveting pin;

[0048] The driving system works, driving the riveting actuator to move vertically, so that the riveting head 5 and the riveting pre-pressing sleeve 4 are aligned with the riveting end of the riveting pin;

[0049] The cylinder 7 works to drive the riveting pre-pressing sleeve 4 to move axially and pass over the front end of the riveting head 5 (under normal conditions, the riveting pre-pressing sleeve 4 does not pass over the front end of the riveting head 5);

[0050] The driving system works, driving the riveting actuator to move horizontally until the riveting pre-pressing sleeve 4 is pressed against one side of the bracket body. At this time, the riveting pre-pressing sleeve 4 is loosely sleeved on the riveted end of the riveting pin, applying pre-pressure to the bracket body, so that the left and right side walls of the bracket body of the pedal are tightly attached to the steps at both ends of the riveting pin;

[0051] The driving system works and continues to drive the riveting actuator to translate. The riveting head 5 overcomes the cylinder pressure and continues to translate forward to flip the rivet pin into shape.

[0052] To ensure no axial movement after riveting, the left and right sides of the bracket body must be completely aligned with the left and right steps of the rivet pin before riveting the rivet area. The riveting starting point and the coordinate values for the upper and lower adjustments can be saved and recalled. The next time you rivet the same product, you only need to call up the program without further adjustment.

[0053] See also Figure 5As the riveting force approaches the dead center, the faster it changes. Even with minimal deformation, the force increases significantly, making it difficult to control. The closer the force approaches the target, the slower the riveting speed needs to be. As shown in the figure above, reverse compensation is necessary to effectively control the force. Let's assume the measured riveting force is Ft, the set riveting force is F, the output speed is Vt, and the set riveting speed is V. Then, Vt = V*(1-Ft / F). The closer the force approaches the set value, the slower the speed. When the riveting force is very close to the set value, the speed is very slow, which affects production efficiency. Therefore, a further condition is added: when Ft / F <= 2%, the machine moves at a constant speed at the last calculated speed and determines whether the force has been reached.

[0054] The actual control effect is good, and the force is controlled within 100N at 20000N. The riveting quality is consistent.

[0055] The riveting equipment is of flexible design and can be adapted to all pedal riveting applications and is programmable.

[0056] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A pedal riveting method, characterized in that: The pedal riveting device includes a frame, a fixed flat rivet head and a riveting clamp are provided on the frame, the riveting clamp is used to clamp the bracket body of the pedal, the fixed flat rivet head is used to axially position the flat end of the riveting pin, and also includes a riveting execution device, the riveting execution device includes a mounting frame, a riveting head is provided on one side of the mounting frame, the riveting head is used to flip rivet the flip riveted end of the riveting pin, a cylinder is provided in the mounting frame, the cylinder is dynamically connected to the riveting pre-stressing sleeve, the riveting pre-stressing sleeve is hollowly sleeved on the riveting head, the riveting pre-stressing sleeve is used to apply pre-pressure to the bracket body, and a driving system is also provided on the frame for driving the riveting execution device to move horizontally and vertically; The mounting frame is rectangular, the cylinder is located in the cavity of the mounting frame, the piston rod of the cylinder extends back to the riveting head and is fixed to the mounting frame, the rear portion of the riveted pre-stressing sleeve is provided with a slide groove, the slide groove is slidably fitted in the side portion of the mounting frame, the rear end surface of the riveted pre-stressing sleeve is fixed to the cylinder end of the cylinder, and is used to drive the riveted pre-stressing sleeve to slide axially; The frame is provided with a fixture slide rail along the axial direction of the riveted head, and the riveting fixture is slidably fitted on the fixture slide rail and fixed by bolts so that the axial position of the riveting fixture can be adjusted; Install the pedal's bracket body on the riveting fixture, align the pedal's arm assembly with the pin hole of the bracket body, and insert the rivet pin; Adjust the axial position of the riveting fixture so that the fixed flat rivet head is axially positioned against the flat end of the riveting pin; The driving system works, driving the riveting actuator to move vertically, so that the riveting head and the riveting pre-pressing sleeve are aligned with the riveting end of the riveting pin; The cylinder works to drive the riveting pre-pressing sleeve to move axially and pass over the front end of the riveting head; The driving system works, driving the riveting actuator to move horizontally until the riveting pre-stressing sleeve is pressed against one side of the bracket body. At this time, the riveting pre-stressing sleeve is loosely sleeved on the riveted end of the riveting pin, applying pre-pressure to the bracket body, so that the left and right side walls of the bracket body of the pedal are in close contact with the steps at both ends of the riveting pin; The driving system works and continues to drive the riveting actuator to move horizontally. The riveting head overcomes the cylinder pressure and continues to move forward horizontally, flipping the riveting pin into shape.

2. A pedal riveting method according to claim 1, characterized in that: The driving system includes a moving frame, a Z-direction screw rod, and a Z-direction servo motor. The moving frame is slidably matched with a Z-direction guide rail provided on the frame. The Z-direction servo motor is installed on the frame. The Z-direction screw rod and the moving frame form a screw-nut mechanism. One end of the Z-direction screw rod is connected to the Z-direction servo motor for driving the moving frame to move vertically. A power bearing seat, a guide seat, and a connecting seat are installed on the movable frame. A power transmission cylinder is supported by a bearing in the power bearing seat and axially positioned. A power screw is matched in the power transmission cylinder to form a screw nut mechanism. The front end of the power screw is connected to the riveting actuator for driving the riveting actuator to move horizontally. The rear end of the power screw is connected to the screw anti-rotation block. A screw anti-rotation guide rail is provided on the guide seat along the axial direction of the power screw. The screw anti-rotation block is slidably matched with the screw anti-rotation guide rail for guiding the axial movement of the power screw and circumferentially limiting the position. A power servo motor is installed on the connecting seat, and the power servo motor is connected to the power transmission cylinder in power.

3. A pedal riveting method according to claim 2, characterized in that: The power bearing seat supports a power transmission cylinder through a thrust bearing and a radial bearing. There are two thrust bearings, which are arranged on both sides of the radial bearing.

4. A pedal riveting method according to claim 2, characterized in that: The power transmission cylinder is provided with a driven synchronous pulley, the power servo motor is connected to the driving synchronous pulley, and the driven synchronous pulley and the driving synchronous pulley are connected by a belt to form a belt transmission mechanism.

5. A pedal riveting method according to claim 4, characterized in that: A power planetary reducer is connected between the power servo motor and the active synchronous pulley.

6. A pedal riveting method according to claim 2, characterized in that: The frame is provided with a control system and a touch screen for controlling the operation of the cylinder, the Z-direction servo motor and the power servo motor. An S-type sensor is provided between the power screw and the riveting actuator, and the S-type sensor is connected to the control system signal.

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