A method for preventing errors after a stop position error of a bead bonding drum

Abstract

This invention discloses a method for preventing errors in the stopping position of a bead bonding drum, relating to the field of tire manufacturing technology. The method includes the following steps: a double-acting cylinder is installed at the fixed part of the bead bonding drum; a magnetic detection switch is installed at the extended end and the base of the double-acting cylinder, respectively. This method, by setting a double-acting cylinder and two matching magnetic detection switches at the fixed part of the bead bonding drum equipment, and fixing perforated steel plates on both sides of the rotating part of the bead bonding drum equipment, determines the accuracy of the rotation stopping position by whether the piston rod of the double-acting cylinder can smoothly insert into the circular hole of the perforated steel plate after extension. Position deviation detection can be automatically completed without visual inspection, solving the problem of operators easily missing detections when the equipment operates at a faster pace. When a deviation occurs, the equipment can identify it immediately and trigger a shutdown, preventing the continued progress of erroneous processes.

Description

Technical Field

[0001] This invention relates to the field of tire manufacturing technology, specifically to a method for preventing errors in the stopping position of the bead-fitting drum. Background Technology

[0002] With technological improvements, industrial robots are now used to replace manual labor for bonding wire rings and triangular adhesives. The industrial robot grips the wire ring and aligns it with the triangular adhesive. However, if the stopping position of the bonding drum deviates after rotation (the center is not aligned with the center of the wire ring on the robot), the robot cannot determine this and continues to the next step, leading to unsuccessful bonding. In some cases, the robot may even collide with the forming drum and be damaged. The existing mechanism for the rotating part of the tire bead bonding drum is as follows: it first rotates 180° clockwise to align with the next device, then rotates 180° counterclockwise, repeating this process. Due to mechanical errors or other malfunctions, the rotation angle may be greater than or less than 180°, causing misalignment between the rotating and fixed parts, resulting in unsuccessful bonding with the next step, and ultimately causing equipment malfunction and damage.

[0003] The existing tire bead bonding drum uses a reciprocating operation method of first rotating 180° clockwise to dock with the next device, and then rotating 180° counterclockwise to reset. Due to inherent errors in the mechanical structure or other unforeseen failures, the rotation angle is prone to deviations of more or less than 180°, causing misalignment between the rotating and fixed parts. At the same time, the current technology relies solely on operators to manually observe and judge whether the rotation stop position is accurate through visual indicators. However, as the pace of equipment operation continues to accelerate, operators are prone to missing detections. The equipment itself does not have the ability to automatically detect position deviations and trigger a shutdown. As a result, the robotic arm continues to perform the docking and bonding action of the wire bead and triangular adhesive without recognizing the deviation, ultimately leading to docking failure or even collisions between the robotic arm and the forming drum. This causes equipment failure, reduced product yield, and irreversible damage, seriously affecting production continuity and significantly increasing equipment maintenance costs. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for preventing errors in the stopping position of the bead-fitting drum, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for preventing errors in the stopping position of the tire bead fitting drum, the method comprising the following steps: S1. A double-acting cylinder is installed at the fixed part of the bead-fitting drum. A magnetic detection switch is installed at the extended end and the base of the double-acting cylinder, respectively, which are the extended end magnetic detection switch and the base magnetic detection switch. S2. Fix a perforated steel plate at the rotating part of the bead-fitting drum. When the bead-fitting drum rotates to the correct stopping position, the center of the hole in the perforated steel plate and the center of the piston rod of the double-acting cylinder are on the same vertical line. S3. After the rotating part of the tire bead contact drum completes its rotation and stops, the control system sends a switching signal to the cylinder solenoid valve to control the piston rod of the double-acting cylinder to extend. S4. The signal indicating that the piston of the double-acting cylinder is fully extended is detected by the magnetic detection switch at the extended end: If the magnetic detection switch at the extended end detects a signal, it indicates that the piston rod of the double-acting cylinder is fully extended and inserted into the round hole of the perforated steel plate. The control system determines that there is no deviation in the stop position and sends a switching signal to the cylinder solenoid valve to control the piston rod of the double-acting cylinder to retract. After the magnetic detection switch at the base detects that the piston of the double-acting cylinder has fully retracted into place, the equipment is allowed to run the next action. If the magnetic detection switch at the extended end does not detect a signal, it indicates that the piston rod of the double-acting cylinder cannot fully extend due to the obstruction of the perforated steel plate. The control system determines that the stop position has deviated, and the control equipment stops running and is inspected.

[0006] Preferably, the double-acting cylinder is fixed to the outer wall of the fixed part of the tire bead fitting drum rotating table via a cylinder base.

[0007] Preferably, the diameter of the hole in the perforated steel plate is larger than the diameter of the piston rod of the double-acting cylinder, and the piston rod is fitted into the hole to ensure that the piston rod of the double-acting cylinder can be smoothly inserted into the round hole of the perforated steel plate when the tire bead fitting drum rotates to the correct stop position.

[0008] Preferably, the rotation of the rotating part of the tire bead fitting drum in step S2 is specifically a reciprocating motion: after rotating 180° clockwise to dock with the next device, it rotates 180° counterclockwise to reset. The control system sends a switching signal to the cylinder solenoid valve after each reciprocating rotation is completed and stopped.

[0009] Preferably, in step S3, the control system only issues the next operating instruction of the device after simultaneously receiving the fully extended position signal of the extended end magnetic detection switch and the fully retracted position signal of the subsequent base magnetic detection switch.

[0010] Preferably, in step S3, if the control system does not receive the detection signal from the extended end magnetic detection switch within the preset signal waiting time, it determines that the stop position of the rotating part of the tire bead contact drum has deviated, and immediately triggers the equipment stop command.

[0011] Preferably, the piston rod extension and retraction actions of the double-acting cylinder are achieved by switching the air path through the cylinder solenoid valve, and the air path includes the rodless chamber air intake circuit of the double-acting cylinder and the rod chamber air intake circuit of the double-acting cylinder.

[0012] Preferably, the extended end magnetic detection switch is used to detect the state in which the piston of the double-acting cylinder is fully extended.

[0013] Preferably, the magnetic detection switch on the base is used to detect the state in which the piston of the double-acting cylinder is fully retracted and reset.

[0014] Preferably, the bead bonding drum is a rotary forming drum used in the tire industry to bond the steel wire bead and the triangular rubber together, and the error prevention method is performed before the industrial robot grips the steel wire bead and the triangular rubber for bonding.

[0015] This invention provides a method for preventing errors in the stopping position of the tire bead fitting drum. It has the following beneficial effects: (1) By setting a double-acting cylinder and two matching magnetic detection switches at the fixed part of the tire bead bonding drum equipment, and fixing perforated steel plates on both sides of the rotating part of the tire bead bonding drum equipment, the accuracy of the rotation stop position can be judged by whether the piston rod of the double-acting cylinder can be smoothly inserted into the round hole of the perforated steel plate after it extends. The position deviation detection can be completed automatically without visual inspection, which solves the problem that the operator is prone to missing the detection after the equipment operation speed is increased. When the rotation angle is greater than or less than 180°, the equipment can identify and trigger the stop immediately, thus preventing the continuous advancement of the erroneous process.

[0016] (2) The error prevention method adopts a detection method that combines mechanical physical positioning and electrical signal feedback. The position accuracy is verified before the robot performs the action of mating the wire ring and the triangular glue, thus intercepting the risk of position deviation in advance. This prevents the robot from continuing to operate in a state where it cannot identify misalignment, prevents the failure of the docking process and the accident of collision between the robot and the forming drum, protects the core components of the equipment from irreversible damage, and reduces the number of defective products caused by position deviation, thereby improving the overall product yield.

[0017] (3) This error prevention method realizes the automated detection and automatic error prevention shutdown of the stop position deviation of the bead fitting drum. It eliminates the need for operators to constantly monitor the rotating and stopped state of the equipment, reduces the intensity of manual labor, improves the stability of equipment operation, significantly reduces the production downtime caused by equipment failure and collision accidents, ensures the continuous and smooth operation of the production process, and, because it adopts a purely mechanical error prevention detection method, unlike traditional sensor detection, it can prevent the problem of sensor accuracy reduction after long-term use, greatly reduces the cost of equipment maintenance and component replacement, and indirectly improves the overall economic benefits of the tire production process. Attached Figure Description

[0018] Figure 1 This is a flowchart of the error prevention method for the stop position error of the bead bonding drum according to the present invention; Figure 2 This is a flowchart illustrating the steps of the error prevention method for the stop position error of the bead bonding drum according to the present invention; Figure 3 This is a schematic diagram of the anti-error device for the stop position error of the bead bonding drum according to the present invention; Figure 4 This is a schematic diagram of the double-acting cylinder structure of the error prevention device of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 Please see Figure 1-4 This invention provides a method for preventing errors in the stopping position of the bead fitting drum. To achieve the above objective, this invention is implemented through the following technical solution: The error prevention method includes the following steps: S1. A double-acting cylinder is installed at the fixed part of the bead-fitting drum. A magnetic detection switch is installed at the extended end and the base of the double-acting cylinder, respectively, which are the extended end magnetic detection switch and the base magnetic detection switch. S2. Fix a perforated steel plate at the rotating part of the bead-fitting drum. When the bead-fitting drum rotates to the correct stopping position, the center of the hole in the perforated steel plate and the center of the piston rod of the double-acting cylinder are on the same vertical line. S3. After the rotating part of the tire bead contact drum completes its rotation and stops, the control system sends a switching signal to the cylinder solenoid valve to control the piston rod of the double-acting cylinder to extend. S4. The signal indicating that the piston of the double-acting cylinder is fully extended is detected by the magnetic detection switch at the extended end: If the magnetic detection switch at the extended end detects a signal, it means that the piston rod of the double-acting cylinder has fully extended and inserted into the round hole of the perforated steel plate. The control system determines that there is no deviation in the stop position and sends a switching signal to the cylinder solenoid valve to control the piston rod of the double-acting cylinder to retract. After the magnetic detection switch at the base detects that the piston of the double-acting cylinder has fully retracted into place, the equipment is allowed to run the next action. If the magnetic detection switch at the extended end does not detect a signal, it means that the piston rod of the double-acting cylinder cannot be fully extended due to the obstruction of the perforated steel plate. The control system judges that the stop position is deviated, and the control equipment stops running and is inspected. The devices involved in this error prevention method specifically include: a bead bonding drum device and a double-acting cylinder 4; The tire bead bonding drum equipment includes: a fixed base 1 and a rotating table 2, with perforated steel plates 3 fixedly connected to corresponding positions on the two side walls of the rotating table 2 that are far apart from each other; The bottom of the double-acting cylinder 4 is fixedly connected to the cylinder seat 5 by bolts, and the double-acting cylinder 4 is fixedly connected to the side wall of the fixed seat 1 by bolts through the cylinder seat 5. The top of the double-acting cylinder 4 is equipped with a piston rod 6 that extends and retracts. The piston rod 6 is adapted to be inserted into the hole of the perforated steel plate 3. The side wall of the double-acting cylinder 4 away from the fixed base 1 is equipped with a magnetic detection switch 7 at the protruding end and a magnetic detection switch 8 at the base. In the attached diagram: 1. Fixed base; 2. Rotary table; 3. Perforated steel plate; 4. Double-acting cylinder; 5. Cylinder seat; 6. Piston rod; 7. Magnetic detection switch at the extended end; 8. Magnetic detection switch at the base. In this embodiment, after the rotating part of the tire bead fitting drum completes the reciprocating rotation action of clockwise 180° docking or counterclockwise 180° reset and stops, the main control system of the equipment receives the stop signal of the rotary drive motor and the encoder position stabilization signal, and then sends a piston rod extension control command to the solenoid valve. Compressed air enters the rodless chamber of the double-acting cylinder, pushes the piston and drives the piston rod to extend upward and move toward the perforated steel plate fixed in the rotating part. If the rotating part stops at the correct position, the piston rod smoothly inserts into the circular through hole of the perforated steel plate and extends completely into place. The magnetic detection switch at the extended end detects the piston magnetic field signal and feeds it back to the control system. The control system determines that there is no deviation in position and sends a piston rod retraction command. The compressed air is switched to the rod chamber of the cylinder, and the piston rod retracts downward. After the magnetic detection switch on the base detects the retraction signal, the industrial robot is allowed to perform the subsequent steel wire ring and triangular adhesive bonding process. If the angular deviation of the rotating part causes the piston rod to misalign with the through hole, and the piston rod is blocked by the perforated steel plate and cannot fully extend, the control system will immediately determine that the position is abnormal if it does not receive the extension end detection signal within the preset waiting time, cut off the power supply to the robot arm and trigger the light and sound alarm, and the equipment will stop running and wait for troubleshooting.

[0021] Example 2 Specifically: The double-acting cylinder is fixed to the outer wall of the rotating platform of the tire bead fitting drum via a cylinder base.

[0022] The diameter of the hole in the perforated steel plate is larger than the diameter of the piston rod of the double-acting cylinder, and the piston rod is fitted into the hole to ensure that the piston rod of the double-acting cylinder can be smoothly inserted into the round hole of the perforated steel plate when the tire bead fitting drum rotates to the correct stop position. In this embodiment, the cylinder base is made of steel plate with a thickness of not less than 10mm. It is fastened to the outer wall of the fixed part below the tire bead fitting drum rotary table by high-strength bolts. The bolt tightening torque meets the requirements of the equipment installation specifications, which can effectively prevent the double-acting cylinder from loosening or shifting during long-term reciprocating operation and ensure the long-term stability of the detection benchmark. The double-acting cylinder is connected to the cylinder base by a flange, and a rubber sealing gasket is installed between the connection surfaces to absorb the minor vibrations generated during equipment operation and prevent the vibrations from being transmitted to the magnetic detection switch and affecting its detection accuracy. The perforated steel plate is also made of steel plate and is fastened to the corresponding position of the rotating part of the tire bead fitting drum by bolts. During installation, a high-precision level and plumb line are used for calibration to ensure that when the tire bead fitting drum rotates to the correct stop position, the coaxiality error between the center of the hole of the perforated steel plate and the center of the piston rod of the double-acting cylinder is no more than 0.5mm. The diameter of the hole in the perforated steel plate is 1-2 mm larger than the diameter of the piston rod of the double-acting cylinder. This size design allows for minor installation errors and thermal deformation during equipment operation, ensuring that the piston rod can be smoothly inserted into the round hole when it is in the correct position. It also ensures sufficient detection sensitivity. When the stop angle deviation of the rotating part exceeds the allowable range, the piston rod will be blocked by the surface of the perforated steel plate and cannot be fully extended into place.

[0023] Example 3 Specifically: The rotation of the bead-fitting drum in step S2 is as follows: after rotating 180° clockwise to dock with the next device, it rotates 180° counterclockwise to reset. The control system sends a switching signal to the cylinder solenoid valve after each reciprocating rotation is completed and stopped.

[0024] In step S3, the control system only issues the next operating command for the equipment after simultaneously receiving the fully extended signal from the magnetic detection switch at the extended end and the fully retracted signal from the magnetic detection switch at the base.

[0025] If the control system does not receive the detection signal from the magnetic detection switch at the protruding end within the preset signal waiting time in step S3, it is determined that the stop position of the rotating part of the tire bead bonding drum has deviated, and the equipment stop command is immediately triggered. In this embodiment, the rotating part of the bead bonding drum rotates 180° clockwise to connect with the triangular rubber feeding device to complete the bonding process between the triangular rubber and the bead. After bonding, the rotating part rotates 180° counterclockwise to reset and waits to connect with the wire ring feeding device. This cycle repeats to complete the processing of the bead bonding drum. The control system has a built-in rotational motion completion detection unit. When the drive motor of the rotating part stops running and the position signal fed back by the encoder is stable, it is determined that the rotational motion is completed. Then, it automatically sends a switching signal to the cylinder solenoid valve to start the position detection process. The preset signal waiting time is determined based on the extension speed and maximum stroke of the double-acting cylinder. It is generally set to 1.2-1.5 times the theoretical time required for the double-acting cylinder to fully extend. This time setting can ensure that the double-acting cylinder has enough time to complete the extension action, avoiding misjudgment caused by cylinder action delay, and can also avoid excessive waiting time affecting the overall operating efficiency of the equipment. When the control system determines that there is a deviation in the stop position, it immediately cuts off the power supply to the industrial robot and triggers the audible and visual alarm on the equipment's control panel to prompt the operator to handle the fault in time. The equipment cannot automatically resume operation until the fault is resolved.

[0026] Example 4 Specifically: The extension and retraction of the piston rod of the double-acting cylinder are achieved by switching the air path through the cylinder solenoid valve. The air path includes the rodless chamber air intake circuit and the rod chamber air intake circuit of the double-acting cylinder.

[0027] The extended end magnetic detection switch is used to detect the state of the piston of the double-acting cylinder when it is fully extended.

[0028] The base magnetic detection switch is used to detect the state of the piston of the double-acting cylinder when it is fully retracted and reset.

[0029] The bead bonding drum is a rotary forming drum used in the tire industry to bond the steel wire bead and the triangular rubber together. The error prevention method is performed before the industrial robot grabs the steel wire bead and the triangular rubber for bonding. In this embodiment, the cylinder solenoid valve is a two-position five-way solenoid valve. Its air inlet is connected to the compressed air source of the equipment, and its two working ports are respectively connected to the rodless chamber and the rod chamber of the double-acting cylinder. Both exhaust ports are equipped with silencers, which can effectively reduce the noise generated when the cylinder is in motion. When the control system sends an extension signal to the cylinder solenoid valve, the solenoid valve core switches to the first working position, and compressed air enters the rodless chamber of the double-acting cylinder through the rodless chamber intake circuit, pushing the piston upward and extending the piston rod. At the same time, the air in the rod chamber is discharged through the rod chamber intake circuit and the muffler. When the control system sends a retraction signal to the cylinder solenoid valve, the solenoid valve core switches to the second working position, and compressed air enters the rod chamber of the double-acting cylinder through the rod chamber intake circuit, pushing the piston downward and retracting the piston rod. At the same time, the air in the rodless chamber is discharged through the rodless chamber intake circuit and the muffler. Both the extended end magnetic detection switch and the base magnetic detection switch are reed switch type magnetic switches. When the magnetic piston moves to the detection switch position, the reed switch inside the switch closes under the action of the magnetic field, generating an electrical signal and feeding it back to the control system. This error-proofing method is strictly implemented before the industrial robot grabs the wire ring and moves it to the bead-fitting drum position. This ensures that the position accuracy is verified before the robot performs the docking action, thus preventing docking failures and equipment collisions caused by positional deviations from the outset.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A method for preventing errors in the stopping position of the tire bead fitting drum, characterized in that: The error prevention method includes the following steps: S1. A double-acting cylinder is installed at the fixed part of the bead-fitting drum. A magnetic detection switch is installed at the extended end and the base of the double-acting cylinder, respectively, which are the extended end magnetic detection switch and the base magnetic detection switch. S2. Fix a perforated steel plate at the rotating part of the bead-fitting drum. When the bead-fitting drum rotates to the correct stopping position, the center of the hole in the perforated steel plate and the center of the piston rod of the double-acting cylinder are on the same vertical line. S3. After the rotating part of the tire bead contact drum completes its rotation and stops, the control system sends a switching signal to the cylinder solenoid valve to control the piston rod of the double-acting cylinder to extend. S4. The magnetic detection switch at the extended end detects the signal indicating that the piston of the double-acting cylinder is fully extended: If the magnetic detection switch at the extended end detects the signal, it means that the piston rod of the double-acting cylinder is fully extended and inserted into the round hole of the perforated steel plate. The control system determines that there is no deviation in the stop position and sends a switching signal to the cylinder solenoid valve to control the piston rod of the double-acting cylinder to retract. After the magnetic detection switch at the base detects that the piston of the double-acting cylinder is fully retracted, the equipment is allowed to proceed to the next step. If the magnetic detection switch at the extended end does not detect the signal, it means that the piston rod of the double-acting cylinder is blocked by the perforated steel plate and cannot be fully extended. The control system determines that there is a deviation in the stop position and controls the equipment to stop running and check.

2. The method for preventing errors in the stopping position of the bead-fitting drum according to claim 1, characterized in that: The double-acting cylinder is fixed to the outer wall of the fixed part of the tire bead fitting drum rotary table via a cylinder base.

3. The method for preventing errors in the stopping position of the bead-fitting drum according to claim 1, characterized in that: The diameter of the hole in the perforated steel plate is larger than the diameter of the piston rod of the double-acting cylinder, and the piston rod is fitted into the hole to ensure that the piston rod of the double-acting cylinder can be smoothly inserted into the round hole of the perforated steel plate when the tire bead fitting drum rotates to the correct stop position.

4. The method for preventing errors in the stopping position of the bead-fitting drum according to claim 1, characterized in that: The rotation of the bead-fitting drum in step S2 is specifically as follows: after rotating 180° clockwise to dock with the next device, it rotates 180° counterclockwise to reset. The control system sends a switching signal to the cylinder solenoid valve after each reciprocating rotation is completed and stopped.

5. The method for preventing errors in the stopping position of the bead-fitting drum according to claim 1, characterized in that: In step S3, the control system only issues the next operating command for the equipment after simultaneously receiving the fully extended signal from the magnetic detection switch at the extended end and the fully retracted signal from the magnetic detection switch at the base.

6. The method for preventing errors in the stopping position of the bead-fitting drum according to claim 1, characterized in that: If the control system does not receive the detection signal from the extended end magnetic detection switch within the preset signal waiting time in step S3, it determines that the stop position of the rotating part of the tire bead contact drum has deviated, and immediately triggers the equipment stop command.

7. The method for preventing errors in the stopping position of the bead-fitting drum according to claim 1, characterized in that: The piston rod extension and retraction of the double-acting cylinder are achieved by switching the air path through the cylinder solenoid valve. The air path includes the rodless chamber air intake circuit and the rod chamber air intake circuit of the double-acting cylinder.

8. The method for preventing errors in the stopping position of the bead-fitting drum according to claim 1, characterized in that: The extended end magnetic detection switch is used to detect the state in which the piston of the double-acting cylinder is fully extended.

9. The method for preventing errors in the stopping position of the bead-fitting drum according to claim 1, characterized in that: The magnetic detection switch on the base is used to detect the state in which the piston of the double-acting cylinder is fully retracted and reset.

10. The method for preventing errors in the stopping position of the bead bonding drum according to claim 1, characterized in that: The bead bonding drum is a rotary forming drum used in the tire industry to bond the steel wire bead and the triangular rubber together. The error prevention method is performed before the industrial robot grips the steel wire bead and the triangular rubber for bonding.

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