Automatic sprue shearing device for automobile injection molding part

Abstract

The invention discloses an automatic sprue shearing device for an automobile injection molding part, and relates to the related technical field of injection molding part production, the automatic sprue shearing device comprises a workbench, a rotating disc and a mechanical arm, the mechanical arm is provided with a shearing mechanism, the shearing mechanism comprises a main body, a mounting disc and a cutter disc, the main body is mounted on the mechanical arm, the mounting disc is rotatably mounted on the main body, and the cutter disc is connected with the mounting disc; the cutter head is provided with an opening, the opening is provided with a cutter point, the cutter head is provided with a grinding surface, a driving mechanism, a stabilizing mechanism and a positioning mechanism are mounted in the main body, the driving mechanism is used for driving the mounting disc to rotate, the stabilizing mechanism is used for floating the mounting disc, and the positioning mechanism is used for locking the opening of the cutter head at a preset angle in an initial state; the problems that during shearing of an existing injection molding part sprue shearing device, a sprue notch becomes white and deforms, the machining beat is prolonged due to the fact that shearing and grinding are conducted in two procedures, the precision stability is poor due to the fact that the shearing depth depends on visual closed-loop control, and a control system is complex due to the fact that the opening direction of a shearing tool cannot be automatically reset are solved.

Description

Technical Field

[0001] This invention relates to the technical field of injection molding production, specifically to an automatic shearing gate device for automotive injection molded parts. Background Technology

[0002] During the production of automotive injection molded parts, residual gate material remains on the product surface after injection molding. This needs to be removed through a shearing process to meet appearance and assembly requirements. Existing automated gate shearing devices for automotive injection molded parts typically employ a structure of a robotic arm coupled with shearing blades. During operation, a vision system locates and identifies the gate, and the control system drives the robotic arm to adjust its posture based on the identification result, aligning the shearing blades with the gate. Subsequently, the shearing blades, driven by a servo motor, complete the gate removal. Some devices also integrate a grinding mechanism, transferring the product to a grinding station for secondary processing after shearing. Compared to traditional manual shearing, this automated shearing device improves production efficiency and reduces labor intensity to a certain extent.

[0003] However, existing devices still have the following shortcomings in practical applications. The shearing mechanism often uses a two-blade, opposing-cutting shear structure, which exerts a squeezing effect on the gate during shearing. For injection molding materials with high toughness, such as polypropylene and polyethylene, the cut edge is prone to whitening, deformation, or even stringing, affecting the product's appearance quality. Shearing and grinding are usually two independent processes, requiring the product to be transferred to a grinding station or processed by another grinding mechanism after shearing. This not only prolongs the processing cycle but also increases equipment costs and floor space. Controlling the shearing depth relies on a closed-loop control system of vision and servo motors. Sensor accuracy and algorithm latency make it difficult to guarantee consistency in each shearing operation, and the device is sensitive to ambient light and dust, leading to decreased accuracy stability over long-term operation. The opening direction of the shearing blade cannot automatically return to its original position before each operation; the vision system must identify the opening direction, and then the robotic arm must perform posture compensation, increasing the complexity of the control system and positioning time. To solve the above-mentioned problems, an automatic gate shearing device for automotive injection molded parts is provided. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic gate shearing device for automotive injection molded parts, in order to solve the problems mentioned in the background art, such as the gate cut turning white and deformed during shearing, the shearing and grinding being done in two separate processes leading to extended processing time, the shearing depth relying on visual closed-loop control resulting in poor accuracy and stability, and the shearing tool opening direction not being able to automatically return to its original position leading to a complex control system.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic shearing gate device for automotive injection molded parts, comprising a worktable, a turntable rotatably mounted on the worktable, and a robotic arm mounted on one side of the worktable. The working end of the robotic arm is equipped with a shearing mechanism, which includes a main body, a mounting plate, and a cutter head. The main body is mounted on the working end of the robotic arm, and a circular groove is provided on the working end of the main body. The mounting plate is rotatably mounted in the circular groove, and the cutter head is fixedly connected to the lower end of the mounting plate, with the end face of the cutter head flush with the working end of the main body. The cutter head has an opening, a blade is provided on one side of the opening, and the end face of the cutter head is set as a grinding surface; The main body is equipped with a drive mechanism, which is connected to the mounting plate for driving the mounting plate to rotate. A stabilizing mechanism is provided between the drive mechanism and the mounting plate, which allows the mounting plate to float axially relative to the drive mechanism. The main body is also equipped with a positioning mechanism, which is used to lock the opening of the cutter head at a preset angle in the initial state.

[0006] In a further embodiment, the drive mechanism includes a motor and a control shaft. The control shaft is rotatably mounted inside the main body, with its lower end connected to a mounting plate and its upper end connected to the motor drive.

[0007] In a further embodiment, the stabilizing mechanism includes a sleeve, a rod, and a spring. The sleeve is fixedly connected to the lower end of the control shaft, the rod is fixedly connected to the upper end of the mounting plate and slidably installed inside the sleeve, and the spring is sleeved on the outside of the sleeve and abuts against the control shaft and the mounting plate. The rod and the sleeve are circumferentially limited to each other, so that the control shaft can drive the mounting plate to rotate synchronously, while allowing the mounting plate to slide axially.

[0008] In a further embodiment, the insertion rod is a cross-shaped long rod, and the lower end of the sleeve is provided with a cross groove that matches the insertion rod, so as to achieve circumferential limiting fit between the insertion rod and the sleeve.

[0009] In a further embodiment, the positioning mechanism includes a positioning cylinder, a control frame, and a telescopic rod. A positioning ring groove is provided on the outer wall of the control shaft. The positioning cylinder is slidably fitted onto the positioning ring groove and is circumferentially limited by the main body. The control frame is slidably installed inside the main body and is connected to the positioning cylinder in a transmission manner. The telescopic rod is installed inside the main body and is connected to the control frame. The lower end of the positioning cylinder and the inner wall of the positioning ring groove are respectively provided with mutually cooperating inclined surfaces. When the positioning cylinder slides downward, the control shaft is forced to rotate to a preset angle through the cooperation of the inclined surfaces.

[0010] In a further embodiment, sliding rods are fixedly connected to both sides of the positioning cylinder, and the control frame is in the shape of an inverted triangle and is slidably sleeved on the outer wall of the positioning cylinder. The sliding direction of the control frame is perpendicular to the sliding direction of the positioning cylinder. Inclined grooves are opened on both inner side walls of the control frame, and two sliding rods are slidably installed in the two inclined grooves respectively, so that the horizontal sliding of the control frame can drive the positioning cylinder to slide up and down.

[0011] In a further embodiment, a trigger rod is installed inside the control frame, and a trigger is installed inside the main body. The trigger is connected to the motor circuit. When the control frame moves to the position where the positioning cylinder is completely disengaged from the positioning ring groove, the trigger rod contacts the trigger and sends an electrical signal to start the motor.

[0012] In a further embodiment, a plurality of placement trays are rotatably mounted above the turntable, and the placement trays are provided with clamps for fixing the injection molded parts.

[0013] In a further embodiment, the placement tray can rotate independently about its axis to adjust the orientation of the injection molded part.

[0014] In a further embodiment, the working end of the body is configured to contact the surface of the injection molded part as a limiting surface during shearing and grinding.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention is an automatic gate shearing device for automotive injection molded parts. By setting a cutter disc, opening the cutter disc, setting a blade on one side of the opening, and setting the end face of the cutter disc as a grinding surface, the cutter disc can cut into the root of the gate in a rotary cutting manner when rotating. After the shearing is completed, it continues to rotate to perform rotary grinding on the gate residue. The shearing and grinding are integrated into the same cutter disc and completed in the same rotational motion. This solves the problems of whitening and deformation of the gate cut due to extrusion in the existing shearing structure and the increased processing time and equipment cost caused by the two processes of shearing and grinding. 2. By setting the main body, the working end of the main body acts as a limiting surface to contact the surface of the injection molded part; the positioning mechanism locks the cutter head opening at a preset angle in the initial state; and the stabilizing mechanism allows the mounting plate to float axially relative to the drive mechanism. This solves the problems of poor shearing depth due to reliance on vision systems and servo motor closed-loop control in existing devices, the complexity of the control system due to the need to identify the opening direction by vision systems, and the incomplete or excessive grinding caused by inconsistent gate residual height. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an automatic shearing gate device for automotive injection molded parts proposed in this invention; Figure 2 This invention proposes an automatic shearing gate device for automotive injection molded parts. Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the shearing mechanism of an automatic shearing gate device for automotive injection molded parts proposed in this invention; Figure 4 This is a schematic diagram of the main internal components of an automatic shearing gate device for automotive injection molded parts proposed in this invention. Figure 5 This is a side view of the internal components of an automatic shearing gate device for automotive injection molded parts proposed in this invention. Figure 6 This is a cross-sectional view of the control frame of an automatic shearing gate device for automotive injection molded parts proposed in this invention. Figure 7 This is a schematic cross-sectional view of the control axis of an automatic shearing gate device for automotive injection molded parts proposed in this invention. Figure 8 This is a cross-sectional view of the control axis of an automatic shearing gate device for automotive injection molded parts proposed in this invention; Figure 9 This is a schematic diagram of the control frame and telescopic rod connection structure of an automatic shearing gate device for automotive injection molded parts proposed in this invention; Figure 10 This is an exploded view of the cutter head and mounting plate of an automatic shearing gate device for automotive injection molded parts proposed in this invention; Figure 11 This is a schematic diagram of the cutter head structure of an automatic shearing gate device for automotive injection molded parts proposed in this invention.

[0017] In the diagram: 1. Turntable; 11. Placement plate; 12. Fixture; 2. Robotic arm; 3. Shearing mechanism; 31. Main body; 311. Trigger; 32. Mounting plate; 33. Cutter head; 331. Opening; 332. Blade; 333. Grinding surface; 34. Control shaft; 35. Motor; 4. Stabilizing mechanism; 41. Sleeve; 42. Insert rod; 43. Spring; 5. Positioning mechanism; 51. Positioning cylinder; 511. Side strip; 512. Slide rod; 52. Control frame; 521. Trigger rod; 53. Telescopic rod. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0019] Please see Figures 1-11This embodiment provides an automatic shearing gate device for automotive injection molded parts, including a worktable, a turntable 1 rotatably mounted on the worktable, and a robotic arm 2 mounted on one side of the worktable.

[0020] like Figure 1 As shown, multiple placement trays 11 are rotatably mounted above the turntable 1, and clamps 12 for fixing the injection molded parts are provided on the placement trays 11. The turntable 1 rotates intermittently, sending the placement trays 11 from different workstations to the vicinity of the robotic arm 2. The placement trays 11 can rotate independently around their axes to adjust the orientation of the injection molded parts, so that the gates on the injection molded parts face the working end of the robotic arm 2. This combination structure of the turntable 1 and the placement trays 11 enables continuous operation at multiple workstations. While shearing is being performed at one workstation, loading and unloading operations can be performed simultaneously at other workstations, significantly improving production efficiency. At the same time, the independent rotation function of the placement trays 11 allows the device to adapt to changes in the gate orientation of injection molded parts of different shapes without requiring significant posture adjustments to the robotic arm 2, reducing the motion complexity of the robotic arm 2 and shortening the processing cycle of a single workstation.

[0021] The working end of the robotic arm 2 is equipped with a shearing mechanism 3. The robotic arm 2 also has a positioning detection mechanism and a control mechanism, implemented using existing technology. The positioning detection mechanism confirms the precise position of the gate through a vision system and feeds this information back to the control system. The control system then controls the movement trajectory of the robotic arm 2 based on the feedback information, enabling the robotic arm 2 to precisely move the shearing mechanism 3 to the gate position, ensuring that the opening 331 of the cutter head 33 can accurately fit onto the gate. This vision-guided positioning method of the robotic arm 2 can adapt to minor positional deviations of different batches of injection molded parts on the placement tray 11, ensuring that the relative positional accuracy between the opening 331 and the gate is controlled within ±0.5mm during each shearing operation, providing a reliable positioning basis for subsequent shearing and grinding.

[0022] The shearing mechanism 3 includes a main body 31, a mounting plate 32, and a cutter head 33. For example... Figure 2 and Figure 3 As shown, the main body 31 is mounted on the working end of the robotic arm 2. A circular groove is formed at the working end of the main body 31, and the mounting plate 32 is rotatably mounted within this groove. The cutter head 33 is fixedly connected to the lower end of the mounting plate 32, and its end face is flush with the working end of the main body 31. This structure, which sets the end face of the cutter head 33 flush with the working end of the main body 31, allows the working end of the main body 31 to serve as a limiting reference surface, directly contacting the surface of the injection molded part during shearing and grinding. This enables precise control of the feed depth of the cutter head 33, avoiding over-cutting or grinding damage to the injection molded part. The design of the working end of the main body 31 as a limiting surface also provides a physical reference for the axial position of the cutter head 33, eliminating the need for sensors to detect the distance between the cutter head 33 and the surface of the injection molded part, simplifying the control system and improving positioning reliability.

[0023] The cutter head 33 has an opening 331, with a blade 332 on one side of the opening 331. The end face of the cutter head 33 is a grinding surface 333. The shape of the opening 331 is larger than the cross-sectional shape of the gate, facilitating the smooth entry of the gate into the opening 331 and ensuring unobstructed entry. The blade 332 is located on one side of the opening 331. When the cutter head 33 rotates, the blade 332 can cut into the root of the gate in a rotary cutting manner. This cutting method differs from the extrusion cutting of traditional shear cutters; instead, it adopts a turning-like principle, gradually cutting in from the circumference, effectively avoiding problems such as gate whitening and deformation caused by extrusion. It is especially suitable for injection molding materials with high toughness, such as polypropylene and polyethylene. The grinding surface 333 is located on the entire end face of the cutter head 33 facing the injection molded part. When the cutter head 33 continues to rotate, the grinding surface 333 can rotary grind the remaining gate material after shearing, making the gate cross-section flush with the surface of the injection molded part. The surface roughness of the 333 grinding surface can be selected according to the surface requirements of different injection molded parts. For high-gloss appearance parts, a fine grinding surface can be used, while for internal structural parts, a coarse grinding surface can be used to improve grinding efficiency.

[0024] A drive mechanism is installed inside the main body 31, which is connected to the mounting plate 32 for driving the mounting plate 32 to rotate. The drive mechanism includes a motor 35 and a control shaft 34. The control shaft 34 is rotatably installed inside the main body 31, with its lower end connected to the mounting plate 32 and its upper end connected to the motor 35. The motor 35 drives the control shaft 34 to rotate, which in turn drives the mounting plate 32 and the cutter head 33 to rotate synchronously, providing continuous rotational power for shearing and grinding. The motor 35 is a high-torque motor, capable of outputting large torque at low speeds, ensuring sufficient cutting force when the cutter head 332 cuts into the gate. At the same time, the speed of the motor 35 is adjustable to adapt to the shearing and grinding needs of gates made of different materials. For hard and brittle materials, a lower speed can be used to avoid edge chipping, while for tough materials, a higher speed can be used to improve cutting efficiency.

[0025] A stabilizing mechanism 4 is provided between the drive mechanism and the mounting plate 32. The stabilizing mechanism 4 allows the mounting plate 32 to float axially relative to the drive mechanism. The stabilizing mechanism 4 includes a sleeve 41, a rod 42, and a spring 43. A mounting groove is formed at the lower end of the control shaft 34, and the sleeve 41 is fixedly connected to the mounting groove. The rod 42 is fixedly connected to the upper end of the mounting plate 32 and is slidably installed inside the sleeve 41. The spring 43 is sleeved on the outside of the sleeve 41, and its two ends abut against the top surface of the mounting groove of the control shaft 34 and the upper end of the mounting plate 32, respectively. The rod 42 and the sleeve 41 are circumferentially limited, allowing the control shaft 34 to drive the mounting plate 32 to rotate synchronously through the sleeve 41 and the rod 42, while allowing the mounting plate 32 to slide axially relative to the control shaft 34. The structural design of this stabilizing mechanism 4 allows the cutter head 33 to float upwards when subjected to axial force. When there is protruding gate residue on the surface of the injection molded part, the cutter head 33 can automatically adapt and conform to the surface of the residue for grinding. At the same time, under the elastic force of the spring 43, a certain grinding pressure is maintained to ensure grinding uniformity. When the working end of the main body 31 contacts the surface of the injection molded part, the spring 43 is compressed, and the cutter head 33 slides upwards relative to the control shaft 34. However, the end face of the cutter head 33 can still remain flush with or higher than the working end of the main body 31, ensuring precise and controllable grinding depth. The floating function of the stabilizing mechanism 4 also effectively absorbs the small axial errors that may exist when the robotic arm 2 is positioned, avoiding rigid collisions between the cutter head 33 and the surface of the injection molded part, thus protecting the surface of the injection molded part and the cutter head 33.

[0026] The insert rod 42 is a cross-shaped long rod, and the lower end of the sleeve 41 has a cross groove that matches the insert rod 42, so as to achieve circumferential limiting fit between the insert rod 42 and the sleeve 41. The fit between the cross-shaped long rod and the cross groove can not only reliably transmit rotational torque, but also allow the insert rod 42 to slide smoothly in the sleeve 41. At the same time, the cross-shaped cross section has high torsional strength and can withstand the instantaneous impact torque generated by the cutter head 33 when shearing the gate, avoiding slippage or deformation under high load conditions. The fit between the cross groove and the cross rod also provides four symmetrical contact surfaces, making the torque transmission more uniform, reducing stress concentration on a single contact surface, and extending the service life of the parts.

[0027] A positioning mechanism 5 is also installed inside the main body 31. The positioning mechanism 5 is used to lock the opening 331 of the cutter head 33 at a preset angle in the initial state. The positioning mechanism 5 includes a positioning cylinder 51, a control frame 52, and a telescopic rod 53. A positioning ring groove is provided on the outer wall of the control shaft 34. The positioning cylinder 51 is slidably fitted onto the positioning ring groove and is circumferentially limited by the main body 31. The control frame 52 is slidably installed inside the main body 31 and is connected to the positioning cylinder 51 in a transmission manner. The telescopic rod 53 is installed inside the main body 31 and connected to the control frame 52. The telescopic rod 53 is set as an electric push rod. The lower end of the positioning cylinder 51 and the inner wall of the positioning ring groove are respectively provided with mutually cooperating inclined surfaces. When the positioning cylinder 51 slides downward, the control shaft 34 is forced to rotate to the preset angle through the cooperation of the inclined surfaces. The structural design of this positioning mechanism 5 can forcibly return the opening 331 of the cutter head 33 to a fixed direction before each operation, ensuring that the opening 331 can accurately align with the gate when the robotic arm 2 moves. This eliminates the need for a vision system to identify the direction of the opening 331, simplifying the control logic and improving positioning reliability. The mechanical zeroing method of the positioning mechanism 5 complements the vision-guided positioning of the robotic arm 2. The vision system is responsible for moving the shearing mechanism 3 to the gate position, while the positioning mechanism 5 ensures the correct orientation of the opening 331 of the cutter head 33. Working together, they achieve high-precision gate positioning.

[0028] Slide rods 512 are fixedly connected to both sides of the positioning cylinder 51. The control frame 52 has a U-shaped structure and is slidably sleeved on the outer wall of the positioning cylinder 51. The sliding direction of the control frame 52 is perpendicular to the sliding direction of the positioning cylinder 51. Inclined grooves are opened on the inner two side walls of the control frame 52, and the two slide rods 512 are slidably installed in the two inclined grooves respectively, so that the horizontal sliding of the control frame 52 can drive the positioning cylinder 51 to slide up and down. Specifically, when the telescopic rod 53 pushes the control frame 52 to move horizontally, the inclined inner wall of the inclined groove generates a vertical component force on the slide rod 512, forcing the slide rod 512 to slide along the inclined groove, thereby driving the positioning cylinder 51 to move up or down. This transmission structure of inclined groove and slide rod 512 converts the horizontal movement of the telescopic rod 53 into the vertical movement of the positioning cylinder 51. It has a compact structure, reliable transmission, and can accurately control the lifting stroke of the positioning cylinder 51 by the inclination angle of the inclined groove. The inclination angle of the sloping groove is set to 45 degrees, so that the horizontal displacement of the control frame 52 is equal to the vertical displacement of the positioning cylinder 51, which facilitates stroke control and position calculation.

[0029] A trigger rod 521 is installed inside the control frame 52, and a trigger 311 is installed inside the main body 31. The trigger 311 is connected to the motor 35 via wiring and is configured as a trigger sensor. When the control frame 52 moves to the position where the positioning cylinder 51 is completely disengaged from the positioning ring groove, the trigger rod 521 contacts the trigger 311 and sends an electrical signal to start the motor 35. Specifically, after the positioning cylinder 51 slides downward to rotate the control shaft 34 back to its original position, the telescopic rod 53 drives the control frame 52 to move in the opposite direction, causing the positioning cylinder 51 to lift upward and disengage from the inclined surface of the positioning ring groove. At this point, the control shaft 34 can rotate freely. When the control frame 52 moves into position, the trigger rod 521 contacts the trigger 311, which sends an electrical signal to start the motor 35. The motor 35 then begins to drive the control shaft 34 and the cutter head 33 to rotate. This triggering structure enables automatic linkage between positioning release and motor start-up, eliminating the need for additional control programs and simplifying the control process. It also ensures that the motor 35 will not start before the locking in the direction of the opening 331 of the cutter head 33 is completely released, avoiding the jamming of the control shaft 34 or damage to the positioning mechanism 5 caused by the motor 35 starting when the positioning cylinder 51 and the inclined surface of the positioning ring groove are still in contact.

[0030] The working end of the main body 31 is configured to act as a limiting surface in contact with the surface of the injection molded part during shearing and grinding. When the robotic arm 2 moves the shearing mechanism 3 above the injection molded part, the working end of the main body 31 first contacts the surface of the injection molded part, forming a stable depth reference. At this time, the end face of the cutter head 33 is flush with the working end of the main body 31, and the opening 331 of the cutter head 33 is aligned with the gate. As the motor 35 starts, the cutter head 33 begins to rotate, and the blade 332 cuts into the root of the gate. Since the working end of the main body 31 is already limited, the cutter head 33 will not cut excessively, ensuring the accuracy of the shearing depth. After the gate is removed, the cutter head 33 continues to rotate, and the grinding surface 333 contacts the gate residue and grinds it. During this process, if the gate residue protrudes significantly, the cutter head 33 is subjected to an upward thrust, and floats upward through the sliding of the insert rod 42 within the sleeve 41. The spring 43 is compressed, and the grinding surface 333 can still maintain contact with the gate residue. After grinding, spring 43 resets the cutter head 33, making the end face of the cutter head 33 flush with the working end of the main body 31 again. The limiting function of the working end of the main body 31 and the floating function of the stabilizing mechanism 4 work together to enable the device to adapt to different heights of gate residue while ensuring the grinding depth, achieving an organic combination of rigidity and flexibility.

[0031] During the rotational shearing process of the cutter head 33, the cut-off gate waste is thrown into the body 31 by the airflow and centrifugal force driven by the rotation of the cutter head 33. To prevent the waste from accumulating inside the body 31 and affecting the normal operation of the cutter head 33, a discharge port is provided on the outer wall of the body 31. The discharge port is used to discharge the gate waste that has entered the body 31 in a timely manner. The discharge port can be connected to an external negative pressure collection system to use negative pressure to suck the waste into a centralized collection device, or it can be used directly as a discharge outlet, using the airflow generated by the rotation of the cutter head 33 to blow the waste out. The discharge port is located at the lower part of the side wall of the body 31, so that the waste can fall naturally under the action of gravity and be discharged. The inner wall of the discharge port is designed as a smooth arc surface to prevent the waste from sticking and accumulating on the edge of the discharge port. This discharge structure can keep the inside of the body 31 clean, prevent the accumulation of waste from causing the cutter head 33 to jam or affecting the normal operation of the positioning mechanism 5, ensure the long-term stable operation of the device, and reduce the frequency of manual cleaning of waste, thus reducing maintenance costs.

[0032] When the equipment is working, the injection molded part is placed on the placement tray 11 and fixed by the clamp 12. The turntable 1 rotates, sending the placement tray 11 to the working position of the robotic arm 2. The placement tray 11 rotates independently according to the gate orientation, so that the gate faces the robotic arm 2. The positioning detection mechanism on the robotic arm 2 confirms the precise position of the gate through the vision system and feeds it back to the control system. The control system controls the robotic arm 2 to move, moving the shearing mechanism 3 to the gate position, so that the opening 331 of the cutter head 33 is aligned with the gate. In the initial state, the positioning mechanism 5 has locked the opening 331 of the cutter head 33 in the preset direction, and the robotic arm 2 only needs to align the opening 331 with the approximate orientation of the gate. After the working end of the main body 31 contacts the surface of the injection molded part, the telescopic rod 53 drives the control frame 52 to move, so that the positioning cylinder 51 is lifted upward and disengaged from the positioning ring groove. The trigger rod 521 contacts the trigger 311, and the motor 35 starts. Motor 35 drives mounting plate 32 and cutter head 33 to rotate via control shaft 34 and stabilizing mechanism 4. The cutter edge 332 cuts into the root of the gate to complete the shearing. After shearing, cutter head 33 continues to rotate, and grinding surface 333 grinds the gate residue until the gate residue is flush with the surface of the injection molded part. During the grinding process, if the gate residue protrudes, cutter head 33 floats upward to adapt to the surface through stabilizing mechanism 4. The cut gate waste enters the body 31 under the rotation of cutter head 33 and is discharged through the discharge port on the outer wall of body 31. After shearing and grinding are completed, robotic arm 2 resets, turntable 1 rotates, and the next injection molded part is sent to the working position. At the same time, the processed injection molded part is rotated to the unloading position with placement plate 11.

[0033] Compared to existing gate shearing devices that use vision systems for positioning and independent grinding mechanisms, this invention employs a structure with an opening 331 on the cutter head 33 and a blade edge 332 on one side of the opening 331. This achieves rotary circumferential shearing, avoiding the extrusion deformation and whitening problems caused by traditional on-off shears, significantly improving the quality of gate shearing. It is especially suitable for injection molded parts with high appearance requirements, such as automotive interior parts. The structure with a grinding surface 333 on the end face of the cutter head 33 integrates shearing and grinding functions into the same cutter head 33, completing both shearing and grinding processes in the same rotational motion. This reduces the processing time of a single station by more than 40%, significantly improving production efficiency. The stabilizing mechanism 4 allows the cutter head 33 to float axially, enabling the grinding surface 333 to adaptively conform to protruding gate residue, ensuring grinding uniformity and avoiding incomplete or over-grinding problems caused by inconsistent gate residue height. The positioning mechanism 5 locks the opening 331 of the cutter head 33 at a preset angle, achieving purely mechanical zero-positioning of the opening 331. This eliminates the need for a vision system to identify the direction of the opening 331, simplifying the control system and reducing manufacturing costs. The working end of the main body 31 acts as a limiting surface, contacting the injection molded part surface. This physical contact precisely controls the shearing and grinding depth, avoiding errors exceeding ±0.1mm caused by sensor control and improving shearing depth accuracy to within ±0.02mm. The structure with a discharge port on the outer wall of the main body 31 promptly removes gate waste generated during shearing, preventing waste accumulation from affecting the rotation of the cutter head 33 and the normal operation of the positioning mechanism 5, extending the continuous trouble-free operation time of the equipment by more than three times. The comprehensive application of these structures allows this device to simplify the control system, reduce equipment costs, and improve production efficiency and reliability while ensuring shearing quality.

[0034] 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, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic shearing gate device for automotive injection molded parts, comprising a worktable, a turntable (1) rotatably mounted on the worktable, and a robotic arm (2) mounted on one side of the worktable, characterized in that: The working end of the robotic arm (2) is equipped with a shearing mechanism (3). The shearing mechanism (3) includes a main body (31), a mounting plate (32), and a cutter head (33). The main body (31) is installed on the working end of the robotic arm (2). A circular groove is opened on the working end of the main body (31). The mounting plate (32) is rotatably installed in the circular groove. The cutter head (33) is fixedly connected to the lower end of the mounting plate (32), and the end face of the cutter head (33) is flush with the working end of the main body (31). The cutter head (33) has an opening (331), a blade (332) is provided on one side of the opening (331), and the end face of the cutter head (33) is provided as a grinding surface (333). A drive mechanism is installed inside the main body (31), and the drive mechanism is connected to the mounting plate (32) for driving the mounting plate (32) to rotate; A stabilizing mechanism (4) is provided between the drive mechanism and the mounting plate (32), the stabilizing mechanism (4) being used to allow the mounting plate (32) to float axially relative to the drive mechanism; The main body (31) is also equipped with a positioning mechanism (5), which is used to lock the opening (331) of the cutter head (33) at a preset angle in the initial state.

2. The automatic shearing gate device for automotive injection molded parts according to claim 1, characterized in that: The drive mechanism includes a motor (35) and a control shaft (34). The control shaft (34) is rotatably mounted inside the main body (31). The lower end of the control shaft (34) is connected to the mounting plate (32), and the upper end of the control shaft (34) is connected to the motor (35) for transmission.

3. The automatic shearing gate device for automotive injection molded parts according to claim 2, characterized in that: The stabilizing mechanism (4) includes a sleeve (41), a rod (42), and a spring (43). The sleeve (41) is fixedly connected to the lower end of the control shaft (34). The rod (42) is fixedly connected to the upper end of the mounting plate (32) and is slidably installed inside the sleeve (41). The spring (43) is sleeved on the outside of the sleeve (41) and abuts against the control shaft (34) and the mounting plate (32). The rod (42) and the sleeve (41) are circumferentially limited to each other, so that the control shaft (34) can drive the mounting plate (32) to rotate synchronously, while allowing the mounting plate (32) to slide axially.

4. The automatic shearing gate device for automotive injection molded parts according to claim 3, characterized in that: The insertion rod (42) is a cross-shaped long rod, and the lower end of the sleeve (41) is provided with a cross groove that matches the insertion rod (42) so as to realize the circumferential limiting fit between the insertion rod (42) and the sleeve (41).

5. The automatic shearing gate device for automotive injection molded parts according to claim 4, characterized in that: The positioning mechanism (5) includes a positioning cylinder (51), a control frame (52), and a telescopic rod (53). The outer wall of the control shaft (34) is provided with a positioning ring groove. The positioning cylinder (51) is slidably fitted onto the positioning ring groove and is circumferentially limited by the main body (31). The control frame (52) is slidably installed inside the main body (31) and is connected to the positioning cylinder (51) in a transmission manner. The telescopic rod (53) is installed inside the main body (31) and is connected to the control frame (52). The lower end of the positioning cylinder (51) and the inner wall of the positioning ring groove are respectively provided with mutually cooperating inclined surfaces. When the positioning cylinder (51) slides down, the control shaft (34) is forced to rotate to a preset angle through the cooperation of the inclined surfaces.

6. The automatic shearing gate device for automotive injection molded parts according to claim 5, characterized in that: The positioning cylinder (51) is fixedly connected to two sides by sliding rods (512). The control frame (52) has a U-shaped structure and is slidably sleeved on the outer side wall of the positioning cylinder (51). The sliding direction of the control frame (52) is perpendicular to the sliding direction of the positioning cylinder (51). The inner two side walls of the control frame (52) are provided with inclined grooves. The two sliding rods (512) are respectively slidably installed in the two inclined grooves, so that the horizontal sliding of the control frame (52) can drive the positioning cylinder (51) to slide up and down.

7. The automatic shearing gate device for automotive injection molded parts according to claim 6, characterized in that: The control frame (52) is equipped with a trigger rod (521), and the main body (31) is equipped with a trigger (311). The trigger (311) is connected to the motor (35) by wiring. When the control frame (52) moves to the position where the positioning cylinder (51) is completely separated from the positioning ring groove, the trigger rod (521) contacts the trigger (311) and sends an electrical signal to start the motor (35).

8. The automatic shearing gate device for automotive injection molded parts according to claim 7, characterized in that: Multiple placement trays (11) are rotatably mounted above the turntable (1), and clamps (12) for fixing injection molded parts are provided on the placement trays (11).

9. The automatic shearing gate device for automotive injection molded parts according to claim 8, characterized in that: The placement tray (11) can rotate independently about its axis to adjust the orientation of the injection molded part.

10. An automatic shearing gate device for automotive injection molded parts according to claim 9, characterized in that: The working end of the main body (31) is configured to contact the surface of the injection molded part as a limiting surface during shearing and grinding.

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