Trimming device for rubber product manufacturing

Abstract

The invention belongs to the technical field of rubber product trimming treatment, and particularly relates to a trimming device for rubber product manufacturing, which comprises a case and a mounting frame rotating through a driving mechanism, the inner wall of the bottom of the case is fixedly connected with a processing boss, the top end of the processing boss is a convex structure for placing a rubber ring, and the bottom end of the mounting frame is fixedly connected with an electric push rod. An output shaft of the electric push rod is fixedly connected with a knife rest, and a replaceable trimming knife is installed on the knife rest. According to the edge trimming device, the convex structure of the machining boss is matched with the rotary type edge trimming cutter, so that the cutter always moves along the edge track of the rubber ring, the electric push rod pushes the edge trimming cutter to gradually approach the rubber ring, and edge trimming is achieved, so that the situation that in the prior art, the cutter and the root of a hard block form instantaneous impact, and consequently tipping or damage to the rubber ring is caused is avoided.

Description

Technical Field

[0001] This invention relates to the field of rubber product trimming technology, and more particularly to a trimming device for manufacturing rubber products. Background Technology

[0002] During the production of rubber rings, burrs and excess material on the edges need to be trimmed. Because the thickness of the excess material at the junction with the rubber ring is usually greater than the thickness of the excess material's edge, it easily forms a thicker, harder lump at this point (e.g., Figure 1 (The location of the hard block is shown).

[0003] Existing trimming equipment typically adjusts the trimming blade directly to align with the edge of the rubber ring. Figure 1 The trimming is completed in one go. However, this method causes the trimming blade to come into direct contact with the root of the hard block, generating a sudden burst of tensile force during trimming. This can deform the rubber ring and easily damage both the rubber ring and the trimming blade, affecting product quality and equipment lifespan. Summary of the Invention

[0004] Based on the technical problems existing in the prior art, the present invention proposes a trimming device for manufacturing rubber products.

[0005] This invention discloses a trimming device for manufacturing rubber products, comprising a housing and a rotating mounting frame via a drive mechanism. A processing boss is fixedly connected to the bottom inner wall of the housing, and the top of the processing boss is a convex structure for placing a rubber ring. An electric actuator is fixedly connected to the bottom end of the mounting frame, and a tool holder is fixedly connected to the output shaft of the electric actuator. A replaceable trimming blade is mounted on the tool holder. The rubber ring is placed on the convex structure at the top of the processing boss. The drive mechanism drives the mounting frame to rotate, and the electric actuator pushes the tool holder to move, causing the trimming blade to contact the edge of the rubber ring. Trimming is achieved through the rotation of the mounting frame.

[0006] Preferably, it also includes a fixing mechanism, which includes a hydraulic cylinder fixedly connected to the top of the machine housing. The output shaft of the hydraulic cylinder extends into the machine housing and is fixedly connected to a pressure cap that can be fitted onto the top of the processing boss. After the rubber ring is placed, the hydraulic cylinder drives the output shaft to extend, causing the pressure cap to move down and fit onto the top of the processing boss and press the rubber ring tightly, preventing the rubber ring from shifting during the trimming process.

[0007] Preferably, the drive mechanism includes a gear ring, a motor, and a gear. The mounting bracket is rotatably connected to the pressure cover via a collar at its end. The motor is fixedly connected to the top of the pressure cover. The gear is mounted on the output shaft of the motor. The gear ring is fixedly sleeved on the collar, and the gear ring and the gear are meshed together. When the motor starts, it drives the gear to rotate. The gear meshes with the gear ring, driving the collar and the mounting bracket to rotate around the pressure cover, thereby causing the trimming knife at the bottom of the mounting bracket to perform a circular motion for trimming.

[0008] Preferably, a guide post is fixedly connected to one end of the tool holder near the mounting frame, and the other end of the guide post passes through the mounting frame; when the electric actuator moves the tool holder left and right to adjust the position of the trimming knife, the guide post slides along the through hole in the mounting frame, which guides the movement of the tool holder and ensures the stability of the trimming knife movement.

[0009] Preferably, a trimming device for manufacturing rubber products further includes: a thickness detection module installed on the side of the trimming blade, used to monitor the thickness change of the trimming area in real time and generate a thickness mutation coefficient through a control module; a current detection module installed on the power supply current of the electric actuator, used to monitor the fluctuation of the working current of the electric actuator in real time and generate a current fluctuation coefficient through a control module; the control module performs comprehensive analysis on the generated thickness mutation coefficient and current fluctuation coefficient to generate an evaluation coefficient, determines whether the trimming speed needs to be adjusted, compares the evaluation coefficient with a preset reference threshold, and controls the working state of the electric actuator based on the comparison result.

[0010] Preferably, the output and input terminals of the thickness detection module and the output and input terminals of the current detection module are electrically connected to the input and output terminals of the control module, respectively, and the output terminal of the control module is electrically connected to the input terminal of the electric actuator.

[0011] Preferably, the control module controls the working state of the electric actuator based on the comparison results through the following steps:

[0012] The thickness detection module collects the thickness change of the trimming area; the current detection module collects the working current fluctuation of the electric actuator; the control module calculates the thickness mutation coefficient, current fluctuation coefficient and evaluation coefficient; if the evaluation coefficient is less than the first threshold: the trimming knife advances in high-speed mode; if the evaluation coefficient is greater than or equal to the first threshold: the trimming knife slows down; if the evaluation coefficient is greater than or equal to the second threshold: it immediately retracts, pauses trimming and then tries again at a very low speed.

[0013] Preferably, the generation logic of the thickness abrupt change coefficient is as follows:

[0014] The thickness detection module acquires actual thickness data at multiple sampling times within a set time period T, and calculates the ratio of the standard deviation of the thickness sampling data to the average thickness within this time period. This ratio is used to quantify the severity of thickness gradient changes.

[0015] Preferably, the logic for generating the current fluctuation coefficient is as follows:

[0016] The actual working current data of the electric actuator is obtained at multiple sampling times within a set time period T by the current detection module. The ratio of the standard deviation of the current sampling data to the average current within this time period is calculated. This ratio is used to reflect the dynamic abnormal fluctuation of the cutting resistance.

[0017] Preferably, the logic for generating the evaluation coefficients is as follows:

[0018] The control module performs logarithmic smoothing on the thickness mutation coefficient and the current fluctuation coefficient, and then performs weighted fusion calculations based on dynamically determined weight coefficients to generate an assessment coefficient that comprehensively represents the mechanical damage risk level of the trimming process.

[0019] Compared with the prior art, the present invention provides a trimming device for manufacturing rubber products, which has the following advantages:

[0020] 1. A trimming device for manufacturing rubber products, wherein the convex structure of the processing boss cooperates with a rotary trimming knife, so that the knife always moves along the edge trajectory of the rubber ring, and the electric push rod pushes the trimming knife to gradually approach the rubber ring, thereby achieving trimming, thereby avoiding the instantaneous impact between the knife and the root of the hard block in the prior art, which would cause chipping or damage to the rubber ring.

[0021] 2. A trimming device for manufacturing rubber products, which solves the problem of rubber ring displacement due to force during the trimming process by setting a fixing mechanism (hydraulic cylinder, pressure cap). The pressure cap is driven by the hydraulic cylinder to press the rubber ring tightly, preventing the rubber ring from shifting under the action of the trimming knife, ensuring the correspondence accuracy between the trimming trajectory and the edge of the rubber ring, and reducing trimming deviation caused by displacement.

[0022] 3. A trimming device for manufacturing rubber products, by incorporating a thickness detection module, a current detection module, and a control module, solves the problem of instantaneous pulling force generated when the trimming blade directly contacts the root of a hard block during one-time trimming in traditional equipment. The thickness detection module captures sudden thickness changes, the current detection module senses load fluctuations, and the control module dynamically adjusts the trimming speed accordingly: reducing speed or retracting when encountering a hard block to reduce the instantaneous impact force between the blade and the rubber ring, preventing rubber ring deformation and blade chipping; resuming high speed in normal areas to ensure trimming efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the rubber ring before trimming.

[0024] Figure 2 This is a schematic diagram of the overall structure of a trimming device for manufacturing rubber products according to the present invention.

[0025] Figure 3 This is a schematic cross-sectional view of the cap structure of a trimming device for manufacturing rubber products proposed in this invention;

[0026] Figure 4 for Figure 3 A magnified structural diagram at point A;

[0027] Figure 5 This is a schematic diagram of the structure of a trimming device for manufacturing rubber products according to the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of a trimming device for manufacturing rubber products proposed in this invention.

[0029] In the diagram: 1. Chassis; 2. Machining boss; 3. Mounting bracket; 4. Electric actuator; 5. Tool holder; 6. Trimming tool; 7. Guide post; 8. Hydraulic cylinder; 9. Pressure cap; 10. Collar; 11. Gear ring; 12. Motor; 13. Gear; 14. Thickness detection module; 15. Current detection module; 16. Control module. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] Reference Figures 1-6 A trimming device for manufacturing rubber products includes a housing 1 and a mounting frame 3 that rotates via a drive mechanism. A processing boss 2 is fixedly connected to the bottom inner wall of the housing 1. The top of the processing boss 2 is a convex structure for placing a rubber ring. An electric push rod 4 is fixedly connected to the bottom end of the mounting frame 3. A tool holder 5 is fixedly connected to the output shaft of the electric push rod 4. A replaceable trimming knife 6 is installed on the tool holder 5.

[0033] In use, the rubber ring is placed on the convex structure at the top of the processing boss 2. The drive mechanism drives the mounting bracket 3 to rotate, and the electric push rod 4 pushes the tool holder 5 to move so that the trimming knife 6 contacts the edge of the rubber ring. Trimming is achieved by rotating the mounting bracket 3.

[0034] Furthermore, it also includes a fixing mechanism, which includes a hydraulic cylinder 8 fixedly connected to the top of the housing 1. The output shaft of the hydraulic cylinder 8 extends into the housing 1 and is fixedly connected to a pressure cap 9 that can be fitted onto the top of the machining boss 2.

[0035] When in use, after the rubber ring is placed, the hydraulic cylinder 8 drives the output shaft to extend, causing the pressure cover 9 to move down and fit onto the top of the processing boss 2 and press the rubber ring to prevent the rubber ring from shifting during the trimming process.

[0036] The drive mechanism includes a gear ring 11, a motor 12 and a gear 13. The mounting bracket 3 is rotatably connected to the cover 9 via the end collar 10. The motor 12 is fixedly connected to the top of the cover 9. The gear 13 is mounted on the output shaft of the motor 12. The gear ring 11 is fixedly sleeved on the collar 10. The gear ring 11 and the gear 13 are meshed together.

[0037] When in use, the motor 12 starts and drives the gear 13 to rotate. The gear 13 meshes with the gear ring 11 to drive the collar 10 and the mounting bracket 3 to rotate around the pressure cover 9, thereby causing the trimming knife 6 at the bottom of the mounting bracket 3 to perform circumferential motion for trimming.

[0038] Among them, the tool holder 5 is fixedly connected to a guide post 7 at one end near the mounting frame 3, and the other end of the guide post 7 passes through the mounting frame 3;

[0039] When in use, the electric actuator 4 moves the tool holder 5 left and right to adjust the position of the trimming knife 6. The guide post 7 slides along the through hole in the mounting bracket 3, which guides the movement of the tool holder 5 and ensures the stability of the movement of the trimming knife 6.

[0040] In another embodiment, a trimming device for manufacturing rubber products further includes:

[0041] The thickness detection module 14 is installed on the side of the trimming knife 6 to monitor the thickness change of the trimming area in real time and generate the thickness mutation coefficient through the control module 16.

[0042] The current detection module 15 is installed on the power supply current of the electric push rod 4 to monitor the fluctuation of the working current of the electric push rod 4 in real time, and generates the current fluctuation coefficient through the control module 16.

[0043] It should be noted that the thickness detection module 14 can be a laser sensor or other device that can monitor the thickness change of the trimming area in real time, the current detection module 15 can be a current sensor or other device that can monitor the fluctuation of the working current of the electric actuator 4 in real time, and the control module 16 is an embedded controller (such as the STM32 series) that integrates data fusion algorithms. Therefore, the thickness detection module 14, the current detection module 15 and the control module 16 are not specifically limited here and can be selected according to actual needs.

[0044] In use, the control module 16 performs a comprehensive analysis of the generated thickness mutation coefficient and current fluctuation coefficient to generate an evaluation coefficient, determines whether the trimming speed needs to be adjusted, compares the evaluation coefficient with a pre-set reference threshold, and controls the working state of the electric actuator 4 based on the comparison result.

[0045] The output and input terminals of the thickness detection module 14 and the output and input terminals of the current detection module 15 are electrically connected to the input and output terminals of the control module 16, respectively, and the output terminal of the control module 16 is electrically connected to the input terminal of the electric push rod 4.

[0046] In another embodiment, the control module 16 performs a comprehensive analysis of the generated thickness mutation coefficient and current fluctuation coefficient to generate an evaluation coefficient, determines whether the trimming speed needs to be adjusted, and compares the evaluation coefficient with a pre-set reference threshold. The execution steps for controlling the working state of the electric actuator 4 based on the comparison result are as follows:

[0047] Real-time detection: Thickness detection module 14 collects the thickness change of the trimming area; current detection module 15 collects the working current fluctuation of electric actuator 4;

[0048] Coefficient calculation:

[0049] Thickness mutation coefficient: Characterizes the severity of thickness distribution in the trimming area, quantifying the thickness gradient change at the interface between burrs and hard blocks; essentially, it is the coefficient of variation of thickness sampling data, eliminating the influence of absolute thickness by the ratio of standard deviation to mean, focusing on capturing relative fluctuation intensity; when δ approaches 0, the thickness is uniform (only thin burrs exist) → cutting resistance is stable, and high-speed trimming is possible; when δ increases significantly → hard blocks appear (thickness mutation area) → the tool encounters impact loads and is prone to chipping;

[0050] The generation logic for the thickness abrupt change coefficient is as follows:

[0051] S1. The actual thickness of the trimming area at different times during the trimming process of the trimming knife 6 within time T is obtained through the thickness detection module 14. The actual thickness obtained at the i-th time within time T is calibrated as... , i = 1, 2, 3, ..., p, where i is a positive integer;

[0052] S2. Calculate the thickness abrupt change coefficient. The expression for the calculation is:

[0053]

[0054] In the formula, denoted as the average thickness over time T; p represents the number of samples taken over time T.

[0055] Current fluctuation coefficient: Characterizes abnormal fluctuations in the load of the electric linear actuator, reflecting the dynamic mechanical resistance changes during tool cutting; essentially, it is an indicator of the degree of discretization of current sampling data; I_σ<0.05→stable current (smooth cutting)→long tool life, no rubber deformation; I_σ>0.1→violent current oscillation (hard block jamming)→overload of electric linear actuator 4, rubber is torn;

[0056] The logic for generating the current fluctuation coefficient is as follows:

[0057] S1. The actual working current of the electric actuator 4 at different times during the trimming process of the trimming knife 6 within time T is obtained through the current detection module 15. The actual working current obtained at time j within time T is calibrated as... j = 1, 2, 3, ..., q, where j is a positive integer;

[0058] S2. Calculate the current fluctuation coefficient. The expression for the calculation is:

[0059]

[0060] In the formula, Let q be the average current over time T; q is the number of samples over time T.

[0061] Evaluation coefficient: This comprehensively quantifies the risk level of the trimming process, integrating the dual threats of thickness mutation δ and load fluctuation I_σ. The thickness mutation coefficient and current fluctuation coefficient are smoothed using a logarithmic function, and then weighted and fused using dynamically determined weighting coefficients to generate an evaluation coefficient that comprehensively characterizes the mechanical damage risk level of the trimming process. This coefficient is then analyzed using a formula by control module 16, based on the following formula:

[0062]

[0063] In the formula, α and β are weighting coefficients (e.g., α=1.2, β=0.8, which need to be dynamically determined based on experimental data and process requirements).

[0064] Dynamic adjustment (refer to) Figure 6 If R_risk < 0.3: the trimming blade advances at high speed (120mm / s); if R_risk ≥ 0.3: the trimming blade slows down to 30mm / s; if R_risk ≥ 0.5: immediately retracts 0.5mm (disengaging from the hard block engagement zone), pauses trimming for 0.5 seconds, and then tries again at an extremely low speed of 10mm / s. Additionally, a reset condition is included: if R_risk < 0.2 within 100ms after slowing down, the high-speed mode is automatically restored.

[0065] Working principle:

[0066] The rubber ring is placed on the convex structure at the top of the processing boss 2. The hydraulic cylinder 8 drives the pressure cover 9 to move down and fit on the top of the processing boss 2 and press the rubber ring. The motor 12 starts and drives the gear 13 to rotate. The gear 13 meshes with the gear ring 11 to drive the transmission, so that the collar 10 and the mounting bracket 3 rotate around the pressure cover 9. The electric push rod 4 pushes the tool holder 5 to move, so that the trimming knife 6 contacts the edge of the rubber ring and achieves trimming as the mounting bracket 3 rotates. The guide column 7 guides the movement of the tool holder 5.

[0067] The thickness detection module 14 monitors the thickness change of the trimming area in real time and generates a thickness mutation coefficient; the current detection module 15 monitors the working current fluctuation of the electric actuator 4 in real time and generates a current fluctuation coefficient; the control module 16 performs a comprehensive analysis of these two coefficients and calculates the evaluation coefficient according to the formula.

[0068] If R_risk < 0.3, the trimming blade advances at a high speed of 120 mm / s; if R_risk ≥ 0.3, the trimming blade slows down to 30 mm / s; if R_risk ≥ 0.5, the trimming blade immediately retracts 0.5 mm, pauses for 0.5 seconds, and then probes at an extremely low speed of 10 mm / s; if R_risk < 0.2 for 100 ms after slowing down, the high-speed mode is automatically restored.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A trimming device for manufacturing rubber products, comprising a housing (1) and a rotating mounting frame (3) via a drive mechanism, characterized in that, The bottom inner wall of the chassis (1) is fixedly connected to a machining boss (2). The top of the machining boss (2) is a convex structure for placing rubber rings. The bottom end of the mounting bracket (3) is fixedly connected to an electric push rod (4). The output shaft of the electric push rod (4) is fixedly connected to a tool holder (5). A replaceable trimming knife (6) is installed on the tool holder (5).

2. The trimming device for manufacturing rubber products according to claim 1, characterized in that, It also includes a fixing mechanism, which includes a hydraulic cylinder (8) fixedly connected to the top of the machine housing (1). The output shaft of the hydraulic cylinder (8) extends into the machine housing (1) and is fixedly connected to a pressure cap (9) that can be fitted onto the top of the machining boss (2).

3. The trimming device for manufacturing rubber products according to claim 2, characterized in that, The drive mechanism includes a gear ring (11), a motor (12) and a gear (13). The mounting bracket (3) is rotatably connected to the cover (9) through the end collar (10). The motor (12) is fixedly connected to the top of the cover (9). The gear (13) is mounted on the output shaft of the motor (12). The gear ring (11) is fixedly sleeved on the collar (10). The gear ring (11) and the gear (13) are meshed together.

4. The trimming device for manufacturing rubber products according to claim 1, characterized in that, The tool holder (5) is fixedly connected to a guide post (7) at one end near the mounting frame (3), and the other end of the guide post (7) passes through the mounting frame (3).

5. The trimming device for manufacturing rubber products according to claim 1, characterized in that, The description also includes: The thickness detection module (14) is installed on the side of the trimming knife (6) to monitor the thickness change of the trimming area in real time and generate the thickness mutation coefficient through the control module (16); The current detection module (15) is installed on the power supply current of the electric push rod (4) to monitor the fluctuation of the working current of the electric push rod (4) in real time, and generates the current fluctuation coefficient through the control module (16); The control module (16) performs a comprehensive analysis of the generated thickness mutation coefficient and current fluctuation coefficient to generate an evaluation coefficient. The evaluation coefficient is compared with a pre-set reference threshold, and the working state of the electric actuator (4) is controlled according to the comparison result.

6. The trimming device for manufacturing rubber products according to claim 5, characterized in that, The output and input terminals of the thickness detection module (14) and the output and input terminals of the current detection module (15) are electrically connected to the input and output terminals of the control module (16), respectively. The output terminal of the control module (16) is electrically connected to the input terminal of the electric push rod (4).

7. A trimming device for manufacturing rubber products according to claim 5, characterized in that, The control module (16) executes the following steps to control the working state of the electric actuator (4) based on the comparison results: The thickness detection module (14) collects the thickness change of the trimming area; the current detection module (15) collects the working current fluctuation of the electric push rod (4); the control module (16) calculates the thickness mutation coefficient, current fluctuation coefficient and evaluation coefficient; if the evaluation coefficient is less than the first threshold: the trimming knife advances in high-speed mode; if the evaluation coefficient is greater than or equal to the first threshold: the trimming knife slows down; if the evaluation coefficient is greater than or equal to the second threshold: immediately retreat, pause trimming and then try again at a very low speed.

8. A trimming device for manufacturing rubber products according to claim 5, characterized in that, The generation logic of the thickness mutation coefficient is as follows: The thickness detection module (14) acquires the actual thickness data at multiple sampling times within a set time period T, and calculates the ratio of the standard deviation of the thickness sampling data to the average thickness within this time period. This ratio is used to quantify the severity of the thickness gradient change.

9. A trimming device for manufacturing rubber products according to claim 5, characterized in that, The logic for generating the current fluctuation coefficient is as follows: The current detection module (15) acquires the actual working current data of the electric actuator at multiple sampling times within a set time period T, and calculates the ratio of the standard deviation of the current sampling data to the average current within this time period. This ratio is used to reflect the dynamic abnormal fluctuation of the cutting resistance.

10. A trimming device for manufacturing rubber products according to claim 5, characterized in that, The logic for generating the evaluation coefficients is as follows: The control module (16) performs logarithmic smoothing on the thickness mutation coefficient and the current fluctuation coefficient, and then performs weighted fusion calculation by combining the dynamically determined weight coefficients to generate an evaluation coefficient that comprehensively represents the mechanical damage risk level of the trimming process.

Images