Injection molding machine rotary table device with locking and control method thereof

Abstract

The application relates to the field of injection molding machines, in particular to an injection molding machine rotary table device with locking and a control method thereof. The injection molding machine rotary table device with locking comprises a machine body, a rotary table mechanism installed at the bottom of the machine body, the rotary table mechanism is a polyhedral structure and has a plurality of working surfaces for installing molds, further comprising: a rotating shaft assembly fixedly connected with the rotary table mechanism, a plurality of limiting columns are arranged at the end of the rotating shaft assembly, the number of the limiting columns is matched with the working surfaces of the rotary table mechanism; a pneumatic rotary joint, an adjusting valve is arranged at the air inlet end of the pneumatic rotary joint; a locking mechanism, the locking mechanism is matched with the limiting columns to lock the rotary table mechanism, the application can adapt to a continuous injection molding process, the yield is greatly improved, the locking reliability is improved, the maintenance and replacement frequency is greatly reduced, the stability is enhanced, the rotary table parking precision is higher, the positioning process stability is greatly enhanced, the overall operation beat efficiency is obviously improved, the safety is higher, and the abnormal shutdown frequency is obviously reduced.

Description

Technical Field

[0001] This invention relates to the field of injection molding machines, and more particularly to an injection molding machine turntable device with locking mechanism and its control method. Background Technology

[0002] As a crucial sector in plastic product manufacturing, injection molding machines are the core equipment in the industry, primarily used to inject molten plastic into mold cavities to form various plastic products. A typical injection molding machine includes key components such as a mold clamping device, injection unit, and mold locking mechanism. The mold clamping device is responsible for tightly closing the two halves of the mold during injection molding, ensuring precise molding of the plastic product. The development trend of modern injection molding machines is towards automation and intelligence, integrating various functional devices to improve production efficiency and product quality.

[0003] As a crucial component of injection molding machines, the rotary table is primarily used for mold rotation positioning and multi-station operation. However, in multi-station continuous injection molding processes, existing rotary table devices struggle to fully constrain rotational freedom, leading to slight lateral movement during the injection and holding pressure stage. This results in flash defects, severely impacting product yield. Secondly, the limiting components of existing locking mechanisms, lacking effective buffering and wear-resistant design over long-term use, are prone to chipping at the groove edges and excessive wear on the groove body, reducing locking reliability and requiring frequent maintenance and replacement, thus affecting the stability of continuous equipment operation. Thirdly, in terms of the control system, traditional rotary table devices lack safety judgment and feedback on locking control, failing to automatically adjust rotational speed based on distance from the target position. This results in low stopping accuracy, poor positioning stability, and difficulty in improving overall operating cycle efficiency. Finally, regarding safety, the existing locking state is susceptible to interference from air pressure fluctuations or mechanical vibrations, posing a risk of "false locking," potentially leading to mold impact accidents, frequent abnormal shutdowns, and insufficient equipment operational safety. Summary of the Invention

[0004] This application provides a locking injection molding machine turntable device and its control method to solve at least one of the above-mentioned problems in the prior art, and adopts the following technical solution:

[0005] A locking injection molding machine turntable device includes a machine body and a turntable mechanism installed at the bottom of the machine body. The turntable mechanism has a polygonal structure and several working surfaces for mounting molds. It also includes: a rotating shaft assembly fixedly connected to the turntable mechanism, with several limiting posts at its end, the number of which matches the number of working surfaces of the turntable mechanism; a pneumatic rotary joint installed at one end of the rotating shaft assembly, with a regulating valve at its air inlet end; and a locking mechanism located at one end of the rotating shaft assembly, which cooperates with the limiting posts to lock the turntable mechanism.

[0006] Preferably, the turntable mechanism is a cuboid with four working surfaces for mounting molds, and there are four limiting posts. The limiting posts are evenly distributed circumferentially along the end face of the rotating shaft assembly, and the angle between adjacent limiting posts is degrees.

[0007] Preferably, the locking mechanism includes a fixed bracket and a limiting member. The fixed bracket is equipped with a cylinder located at the end of the fixed bracket away from the rotating shaft assembly. The limiting member is fixedly connected to the piston rod on the cylinder. The limiting member has a limiting groove that matches the limiting post at the end facing the rotating shaft assembly. The limiting groove and the limiting post engage to limit the rotation of the rotating shaft assembly.

[0008] Preferably, a linear guide rail is provided between the limiting member and the fixed bracket, the guide rail end of the linear guide rail is fixedly connected to the fixed bracket, and the slider end of the linear guide rail is fixedly connected to the limiting member.

[0009] Preferably, the limiting groove of the limiting member is provided with a buffer filling part and a wear-resistant filling part, the wear-resistant filling part is located in the recess of the limiting groove, and the buffer filling part is located at the end of the groove opening of the limiting groove.

[0010] A control method for a locking injection molding machine turntable device includes an injection molding machine turntable device, and further includes: an angle detection module disposed at the end of the rotating shaft assembly; a status sensing module, the status sensing module including a pressure sensor and a proximity switch, the pressure sensor being disposed in the cylinder air circuit, and the proximity switch being disposed at the locking mechanism; a controller; and a human-machine interaction module disposed on the machine body.

[0011] The specific control methods are as follows:

[0012] S1. The rotation command is transmitted to the controller through the human-machine interaction module to determine the target working surface;

[0013] S2. The controller controls the regulating valve to enable the pneumatic rotary joint to drive the turntable mechanism to rotate, and at the same time activates the angle detection module;

[0014] S3. The angle detection module monitors the rotation angle position in real time. When the difference between the real-time angle of the turntable mechanism and the target angle is greater than the angle threshold set by the human-machine interaction module, the first speed is used for rotation. When the difference between the real-time angle and the target angle is less than or equal to the angle threshold set by the human-machine interaction module, the second speed is switched to rotation, and the second speed is less than the first speed.

[0015] S4. When the turntable mechanism reaches the target position, the control cylinder drives the limiting component to move towards the rotating shaft assembly, so that the limiting groove on the limiting component engages with the limiting post to achieve locking.

[0016] S5. Verify the locking status of the locking mechanism through the status perception module. When the locking is in place, the injection molding operation is allowed. When the locking is abnormal, trigger the alarm of the human-machine interaction module and control the cylinder to reset for maintenance.

[0017] S6. If the human-machine interface module sends a stop command to the controller, the locking mechanism remains locked. If the human-machine interface module does not send a stop command to the controller, the injection molding operation is automatically started. After the injection molding is completed, the controller sends a release command to the locking mechanism, causing the piston rod on the cylinder to drive the limit component away from the limit post, releasing the limit on the turntable mechanism. Then, steps S2-S6 are repeated to achieve continuous injection molding.

[0018] Preferably, in step S4, the cylinder pushes the limiting member to move along the linear guide rail direction, the limiting post first contacts the buffer filling part to absorb the impact, and then the limiting post closely cooperates with the wear-resistant filling part to achieve precise positioning and locking.

[0019] Preferably, in step S5, the pressure sensor detects the air pressure in the cylinder, and when the pressure reaches the threshold set by the human-machine interaction module, it is determined that the locking force meets the requirements; the proximity switch detects the position of the limit member, and when the proximity switch is triggered, it is determined that the limit member has moved into place.

[0020] Preferably, it also includes a return spring, one end of which is fixedly connected to the fixed bracket, and the other end of which is fixedly connected to the limiting member.

[0021] Preferably, the method further includes an abnormal handling step: when the locking state verification fails in step S5 or the cylinder pressure rises abnormally, it is determined to be a jamming fault, the pressure is immediately released and feedback is sent to the human-machine interaction module to trigger an alarm, and the reset spring uses its own elasticity to drive the limit member to reset.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This turntable device achieves effective locking in multi-station situations through a multi-station turntable mechanism and limiting posts matching the number of stations. It is adaptable to continuous injection molding processes. The turntable mechanism is locked through the cooperation between the limiting components and the limiting posts. In the locked state, the rotational freedom is completely constrained, completely eliminating flash defects caused by turntable movement during the injection molding and holding pressure stage. The yield rate of injection molded products is greatly improved. Furthermore, by adding a buffer filling layer and a wear-resistant filling layer to the limiting components and arranging them in sections, it can effectively absorb impact energy and resist long-term wear. It can effectively prevent the edge of the limiting groove of the limiting components from cracking and excessive wear of the groove body, improve the locking reliability of the locking mechanism, greatly reduce the maintenance and replacement frequency, and enhance the stability of continuous equipment operation.

[0024] 2. This turntable device is equipped with a reset spring, which provides active reset capability when the cylinder is pressure tested or actively vented, ensuring that the limit component quickly disengages from the limit post. Compared with the single drive solution, the system is safer in case of failure, avoiding secondary damage to other structures of the equipment and preventing the turntable mechanism from jamming due to drive interruption.

[0025] 3. The control method of this turntable device, through the setting of the human-machine interaction module and the angle detection module, divides the speed of the drive turntable mechanism into a first speed and a second speed according to the preset angle threshold. This realizes the intelligent switching of high-speed rotation when the distance to the target position is greater than the threshold and low-speed rotation when it is less than or equal to the threshold. In conjunction with the locking mechanism, it effectively improves the locking of the turntable mechanism during operation, significantly improves the turntable stopping accuracy, greatly enhances the stability of the positioning process, and significantly improves the overall operating cycle efficiency.

[0026] 4. The control method of this turntable device uses a dual state perception verification method consisting of a pressure sensor and a proximity switch in the state perception module. The controller performs collaborative verification of pressure and position signals, effectively eliminating the risk of misjudgment caused by air pressure fluctuations or mechanical vibrations, significantly improving the accuracy of locking state judgment, avoiding mold impact accidents caused by "false locking", greatly enhancing the safety of equipment operation, and significantly reducing the frequency of abnormal shutdowns. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the accompanying drawings are only some embodiments of the present invention. For those skilled in the art, other embodiments and their accompanying drawings can be obtained based on the embodiments shown in these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the turntable mechanism of the present invention;

[0030] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0031] Figure 4 This is a schematic diagram of the side view of the turntable structure of the present invention;

[0032] Figure 5 This is a schematic diagram of the locking mechanism of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of the limiting component of the present invention;

[0034] Figure 7 This is a flowchart of the control method of the present invention;

[0035] Figure 8 This is a logic diagram of the angle detection module of the present invention;

[0036] Figure 9 This is a logic diagram of the state perception module of the present invention.

[0037] Reference numerals: 1. Body; 2. Turntable mechanism; 201. Rotary shaft assembly; 211. Limiting post; 3. Pneumatic rotary joint; 301. Adjusting valve; 4. Locking mechanism; 401. Fixed bracket; 402. Limiting component; 421. Limiting groove; 4211. Buffer filling part; 4212. Wear-resistant filling part; 403. Cylinder; 404. Linear guide rail; 405. Return spring; 5. Angle detection module; 6. Status sensing module; 601. Pressure sensor; 602. Proximity switch; 7. Controller; 8. Human-machine interaction module. Detailed Implementation

[0038] The technical solutions of various 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.

[0039] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Embodiments of the present invention provide a locking injection molding machine turntable device and its control method.

[0042] Example: Figures 1-3 As shown:

[0043] A locking injection molding machine turntable device includes a machine body 1 and a turntable mechanism 2 mounted on the bottom of the machine body 1. The turntable mechanism 2 has a cuboid structure and four working surfaces for mounting molds. This four-station cubic layout fully utilizes the rotational symmetry of the turntable, effectively increasing the number of molds that can be mounted compared to a traditional rotary turntable, and better adapts to continuous injection molding requirements. It also includes:

[0044] A rotating shaft assembly 201 is fixedly connected to the turntable mechanism 2. Four limiting posts 211 are provided at the end of the rotating shaft assembly 201. The number of limiting posts 211 matches the number of working surfaces of the turntable mechanism 2. The limiting posts 211 are evenly distributed circumferentially along the end face of the rotating shaft assembly 201, with an angle of 90 degrees between adjacent limiting posts (211). The number and angle distribution of the limiting posts 211 strictly correspond to the number of working surfaces of the turntable mechanism 2, ensuring that after each 90° rotation of the turntable, the limiting posts 211 are precisely aligned with the limiting grooves 421 of the locking mechanism 4, avoiding locking failure due to angular deviation. Simultaneously, the evenly distributed four-post structure is equivalent to adding four circumferential positioning references, significantly improving the turntable's repetitive positioning accuracy and providing rigid positional assurance for high-precision mold closing. Bearings can be installed on the limiting posts 211. Compared to individual limiting posts 211, the bearings can effectively relieve the stress generated during the locking process of the locking mechanism 4.

[0045] A pneumatic rotary joint 3 is installed at one end of the rotating shaft assembly 201. The pneumatic rotary joint 3 contains a regulating valve 301, which can be an electro-proportional valve. This valve controls the gas pressure and flow rate based on the magnitude of the electrical signal, enabling continuous, stepless adjustment of the gas pressure and allowing for remote and programmable control. The continuous, stepless pressure regulation characteristic of the regulating valve 301 allows for programmable control of the angular acceleration during the turntable's start-up and shutdown process, effectively suppressing mechanical shocks and vibrations caused by sudden torque changes. Especially during the deceleration phase before locking, a "soft landing" stop can be achieved through a preset pressure ramp, significantly reducing the impact stress between the limit post 211 and the limit groove 421, extending the fatigue life of the locking mechanism 4, and reducing positional deviation caused by impact, ensuring reliable locking. It should be noted that the specific structure of the electro-proportional valve can be found in the description of an electro-proportional valve in Chinese Utility Model Specification CN216813063U, and its control method can be found in the description of an electro-proportional valve and control method in Chinese Invention Specification CN120140308A. Both are prior art that is understood by those skilled in the art, and will not be elaborated on here.

[0046] like Figures 4-6 As shown:

[0047] A locking mechanism 4 is located at one end of the rotating shaft assembly 201. The locking mechanism 4 cooperates with the limiting post 211 to lock the turntable mechanism 2. The locking mechanism 4 includes a fixed bracket 401 and a limiting member 402. A cylinder 403 is provided on the fixed bracket 401. The cylinder 403 is located at the end of the fixed bracket 401 away from the rotating shaft assembly 201. The limiting member 402 is fixedly connected to the piston rod on the cylinder 403. The limiting member 402 has a limiting groove 421 that matches the limiting post 211 at the end facing the rotating shaft assembly 201. The limiting groove 421 and the limiting post 211 engage to limit the rotation of the rotating shaft assembly 201. The rigid limiting engagement between the limiting groove 421 and the limiting post 211 fully constrains the rotational freedom of the turntable mechanism 2 around the axis of rotation, resulting in high locking rigidity. Compared with hydraulic brakes or friction locking methods, this structure has no risk of slippage and zero gap in the locking state, fundamentally avoiding flash defects caused by the slight rotation of the turntable during the injection molding and holding pressure stage, and significantly improving the dimensional consistency and appearance quality of the products.

[0048] A linear guide rail 404 is provided between the limiting member 402 and the fixed bracket 401. The linear guide rail 404 includes a slider part and a guide rail part. The guide rail end of the linear guide rail 404 is fixedly connected to the fixed bracket 401, and the slider end of the linear guide rail 404 is fixedly connected to the limiting member 402. The linear guide rail 404 forces the limiting member 402 to move along a straight trajectory, strictly limiting it to retain only axial translational degree of freedom, eliminating tilting or yaw degrees of freedom, and ensuring that the limiting groove 421 and the limiting post 211 always remain coaxially aligned during the docking process, avoiding jamming or edge stress concentration due to guide deviation.

[0049] The limiting member 402 has a buffer filling part 4211 and a wear-resistant filling part 4212 at the limiting groove 421. The wear-resistant filling part 4212 is located in the recess of the limiting groove 421, and the buffer filling part 4211 is located at the end of the groove opening of the limiting groove 421. The buffer filling part 4211 can be made of polyurethane elastomer material, preferably polyester polyurethane, which has a lower compression set and can maintain stable elastic properties. The wear-resistant filling part 4212 can be made of copper-based powder metallurgy material, which has higher wear resistance. There is no specific limitation on the specific filling materials used for the buffer filling part 4211 and the wear-resistant filling part 4212, as long as they can respectively reduce the buffering force generated during the locking process and improve the friction resistance of the limiting member 402. The buffer filling part 4211 absorbs the impact kinetic energy when the limiting post 211 first enters the groove, reduces the instantaneous contact stress peak, and prevents the end of the limiting post 211 from being upset or the edge of the limiting groove 421 from cracking. The wear-resistant filling part 4212 is concentrated in the high-stress area at the bottom of the groove where the limiting post 211 is in long-term contact, which significantly delays the expansion of the fit clearance caused by wear and ensures the long-term rigidity of the locking state. The partitioned arrangement of the two parts greatly improves the service life of the locking mechanism 4 and eliminates the need for frequent replacement of vulnerable parts, reducing downtime maintenance costs.

[0050] A control method for a locking injection molding machine turntable device includes the injection molding machine turntable device and further includes: an angle detection module 5, which can be an incremental photoelectric encoder, installed at the end of the rotating shaft assembly 201. The angle detection module 5 is located at the end of the rotating shaft assembly 201 away from the pneumatic rotary joint 3, and can be connected to the end of the rotating shaft assembly 201 through a flexible coupling to avoid transmission errors. A status sensing module, including a pressure sensor 601 and a proximity switch 602, is also included. The pressure sensor 601 is located in the air passage of the cylinder 403, and the proximity switch 602 is located at the locking mechanism 4. A controller 7 is also included. A human-machine interface module 8 is installed on the machine body 1. The pressure sensor 601 can be a pneumatic pressure sensor, installed at the air inlet of the cylinder 403, used to detect the gas pressure at the air inlet of the cylinder 403. The proximity switch 602 can be an inductive proximity switch, fixed on the limiting member 402. The proximity switch 602 is located in the center of the limiting groove 421 of the limiting member 402. The sensing surface of the proximity switch 602 faces the limiting post 211. The measuring end of the proximity switch 602 does not extend beyond the limiting groove 421 to avoid collision with the limiting post 211.

[0051] like Figure 7 As shown: The specific control method is as follows:

[0052] S1. The rotation command is transmitted to the controller 7 through the human-machine interaction module 8 to determine the target working surface;

[0053] S2, Controller 7 controls regulating valve 301 to enable pneumatic rotary joint 3 to drive turntable mechanism 2 to rotate, and simultaneously activates angle detection module 5;

[0054] S3. The angle detection module 5 monitors the rotation angle position in real time. When the difference between the real-time angle of the turntable mechanism 2 and the target angle is greater than the angle threshold set by the human-machine interaction module 8, the first speed is used for rotation. When the difference between the real-time angle and the target angle is less than or equal to the angle threshold set by the human-machine interaction module 8, the second speed is switched to rotation, and the second speed is less than the first speed.

[0055] S4. When the turntable mechanism 2 reaches the target position, the control cylinder 403 drives the limiting member 402 to move toward the rotating shaft assembly 201, so that the limiting groove 421 on the limiting member 402 engages with the limiting post 211 to achieve locking.

[0056] S5. Verify the locking status of the locking mechanism 4 through the status perception module. When the locking is in place, the injection molding operation is allowed. When the locking is abnormal, the human-machine interaction module 8 is triggered to alarm and the cylinder 403 is controlled to reset for maintenance.

[0057] S6. If the human-machine interface module 8 sends a stop command to the controller 7, the locking mechanism 4 remains locked. If the human-machine interface module 8 does not send a stop command to the controller 7, the injection molding operation is automatically started. After the injection molding is completed, the controller 7 sends a release command to the locking mechanism 4, causing the piston rod on the cylinder 403 to drive the limit member 402 to disengage from the limit post 211, releasing the limit on the turntable mechanism 2. Then, steps S2-S6 are repeated to achieve continuous injection molding.

[0058] To determine whether the injection molding process is complete, methods such as adding strain gauges to measure and compare the weight of the mold before and after injection, and quantitative injection can be used. These are mature existing technologies in this field and will not be elaborated further.

[0059] In step S1, the human-machine interaction module 8 can select a target working surface, such as four working surfaces A, B, C, and D located on the top surface, back surface, bottom surface, and front surface, respectively. Depending on the selected working surface, the turntable mechanism 2 can rotate at different angles, such as 90°, 180°, 270°, or not rotate. The specific method used to select the target working surface is not specifically limited.

[0060] In a preferred embodiment of this application, in step S3, the angle threshold of the human-machine interaction module 8 can be customized by manual operation of the human-machine interaction module 8. It can be customized according to the weight of different mold bases. When the weight of the mold base is large, the rotational inertia of the mold base increases during rotation, so the angle threshold needs to be reduced to ensure that the heavy mold base has sufficient deceleration distance. When the weight of the mold base is small, the angle threshold can be increased to improve the efficiency of light load. The speed switching can use a ramp transition to avoid vibration caused by sudden speed changes and damage to components.

[0061] like Figure 8 As shown: In step S3, the angle detection module 5 collects the rotation angle signal of the turntable mechanism 2 in real time during operation, records the initial angle and the real-time angle during the rotation process, and transmits it to the controller 7. The controller 7 judges the real-time angle based on the initial angle. The controller 7 calculates the difference between the real-time angle and the target angle. If the threshold angle set by the human-machine interaction module 8 is not reached, the controller 7 controls the regulating valve 301 to drive the rotating shaft assembly 201 to rotate according to the air intake required for the first speed. If the threshold angle set by the human-machine interaction module 8 is reached, the controller 7 controls the regulating valve 301 to drive the rotating shaft assembly 201 to rotate according to the air intake required for the second speed.

[0062] In step S4, the cylinder 403 pushes the limiting member 402 to move along the linear guide rail 404. The limiting post 211 first contacts the buffer filling part 4211 to absorb the impact, and then the limiting post 211 closely cooperates with the wear-resistant filling part 4212 to achieve precise positioning and locking.

[0063] like Figure 9 As shown: In step S4, the state sensing module 6 forms a dual collaborative verification mechanism using pressure sensor 601 and proximity switch 602. Pressure sensor 601 monitors the pressure changes in the air circuit of cylinder 403 in real time, identifies the pressure change trend and pressure magnitude, dynamically adjusts the pressure judgment threshold according to the current working conditions, and effectively identifies abnormal pressure characteristics. Proximity switch 602 detects the locking relationship between limit member 402 and limit post 211, determines whether limit member 402 has reached the preset position and cooperates with limit post 211 to form a lock, and adopts a hysteresis comparison mechanism to prevent misjudgment caused by signal jitter, verifies the duration of the position signal, and ensures stable positioning. If controller 7 has driven locking mechanism 4 to lock limit post 211, but proximity switch 602 exceeds the preset response time, controller 7 issues a judgment signal. When at least one of pressure sensor 601 and proximity switch 602 sends an abnormal signal, controller 7 performs abnormal protection, transmits the abnormal signal to human-machine interaction module 8 for alarm, and resets locking mechanism 4.

[0064] In step S5, pressure sensor 601 detects the air pressure of cylinder 403. When the pressure reaches the threshold set by human-machine interaction module 8, it is determined that the locking force meets the requirements. Proximity switch 602 detects the position of limit member 402. When proximity switch 602 is triggered, it is determined that limit member 402 has moved into place.

[0065] It also includes a return spring 405, one end of which is fixedly connected to the fixed bracket 401, and the other end of which is fixedly connected to the limiting member 402. The return spring 405 provides an active reset force when the cylinder 403 loses pressure or power, causing the limiting member 402 to quickly disengage from the limiting post 211, ensuring the timeliness of the turntable's rotation. At the same time, the spring preload can compensate for fluctuations in the cylinder's return resistance, ensuring consistent unlocking displacement each time, avoiding "false unlocking" faults caused by residual resistance, and improving system reliability and fault self-recovery capability.

[0066] The method also includes an abnormal handling step: when the locking state verification fails in step S5 or the pressure of cylinder 403 rises abnormally, it is determined to be a jamming fault, the pressure is immediately released and feedback is sent to the human-machine interaction module 8 to trigger an alarm, and the reset spring 405 uses its own elasticity to drive the limit member 402 to reset.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims, not by the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0068] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A locking turntable device for an injection molding machine, comprising a machine body (1) and a turntable mechanism (2) installed at the bottom of the machine body (1), characterized in that, The turntable mechanism (2) has a polygonal structure and several working surfaces for mounting molds. Also includes: A rotating shaft assembly (201) is fixedly connected to the turntable mechanism (2). The end of the rotating shaft assembly (201) is provided with a plurality of limiting posts (211), the number of which matches the working surface of the turntable mechanism (2). A pneumatic rotary joint (3) is installed at one end of the rotating shaft assembly (201), and an regulating valve (301) is provided at the air inlet end of the pneumatic rotary joint (3). The locking mechanism (4) is located at one end of the rotating shaft assembly (201). The locking mechanism (4) cooperates with the limiting post (211) to lock the turntable mechanism (2).

2. The injection molding machine turntable device with locking mechanism according to claim 1, characterized in that: The turntable mechanism (2) is a cuboid and has four working surfaces for installing molds. There are four limiting posts (211). The limiting posts (211) are evenly distributed around the end face of the rotating shaft assembly (201). The angle between adjacent limiting posts (211) is 90 degrees.

3. The injection molding machine turntable device with locking according to claim 2, characterized in that: The locking mechanism (4) includes a fixed bracket (401) and a limiting member (402). The fixed bracket (401) is provided with a cylinder (403). The cylinder (403) is located at the end of the fixed bracket (401) away from the rotating shaft assembly (201). The limiting member (402) is fixedly connected to the piston rod on the cylinder (403). The limiting member (402) has a limiting groove (421) that matches the limiting post (211) at the end facing the rotating shaft assembly (201). The limiting groove (421) and the limiting post (211) are engaged to limit the rotation of the rotating shaft assembly (201).

4. The injection molding machine turntable device with locking according to claim 3, characterized in that: A linear guide rail (404) is provided between the limiting member (402) and the fixed bracket (401). The guide rail end of the linear guide rail (404) is fixedly connected to the fixed bracket (401), and the slider end of the linear guide rail (404) is fixedly connected to the limiting member (402).

5. A locking injection molding machine turntable device according to claim 3, characterized in that: The limiting member (402) has a buffer filling part (4211) and a wear-resistant filling part (4212) in the limiting groove (421). The wear-resistant filling part (4212) is located in the recess of the limiting groove (421), and the buffer filling part (4211) is located at the end of the groove opening of the limiting groove (421).

6. A control method for an injection molding machine turntable device with locking mechanism, comprising the injection molding machine turntable device as described in any one of claims 3-5, characterized in that, Also includes: An angle detection module (5) is disposed at the end of the rotating shaft assembly (201); The status sensing module includes a pressure sensor (601) and a proximity switch (602). The pressure sensor (601) is located in the air passage of the cylinder (403), and the proximity switch (602) is located at the locking mechanism (4). Controller (7); Human-computer interaction module (8) is installed on the body (1); The specific control methods are as follows: S1. The rotation command is transmitted to the controller (7) through the human-machine interaction module (8) to determine the target working surface; S2, the controller (7) controls the regulating valve (301) to realize the pneumatic rotary joint (3) to drive the turntable mechanism (2) to rotate, and at the same time starts the angle detection module (5); S3. The angle detection module (5) monitors the rotation angle position in real time. When the difference between the real-time angle of the turntable mechanism (2) and the target angle is greater than the angle threshold set by the human-machine interaction module (8), the first speed is used for rotation. When the difference between the real-time angle and the target angle is less than or equal to the angle threshold set by the human-machine interaction module (8), the second speed is switched to rotation. The second speed is less than the first speed. S4. When the turntable mechanism (2) reaches the target position, the control cylinder (403) drives the limiting member (402) to move towards the rotating shaft assembly (201), so that the limiting groove (421) on the limiting member (402) engages with the limiting post (211) to achieve locking. S5. Verify the locking status of the locking mechanism (4) through the status perception module. When the locking is in place, the injection molding operation is allowed. When the locking is abnormal, trigger the human-machine interaction module (8) to alarm and control the cylinder (403) to reset for maintenance. S6. If the human-machine interaction module (8) sends a stop command to the controller (7), the locking mechanism (4) remains locked. If the human-machine interaction module (8) does not send a stop command to the controller (7), the injection operation is automatically started. After the injection is completed, the controller (7) sends a release command to the locking mechanism (4), causing the piston rod on the cylinder (403) to drive the limit piece (402) to disengage from the limit post (211), releasing the limit on the turntable mechanism (2). Then, steps S2-S6 are repeated to achieve continuous injection processing.

7. The control method according to claim 6, characterized in that: In step S4, the cylinder (403) pushes the limiting member (402) to move along the linear guide rail (404). The limiting post (211) first contacts the buffer filling part (4211) to absorb the impact, and then the limiting post (211) closely cooperates with the wear-resistant filling part (4212) to achieve precise positioning and locking.

8. The control method according to claim 6, characterized in that: In step S5, the pressure sensor (601) detects the air pressure of the cylinder (403). When the pressure reaches the threshold set by the human-machine interaction module (8), it is determined that the locking force meets the requirements. The proximity switch (602) detects the position of the limit member (402). When the proximity switch (602) is triggered, it is determined that the limit member (402) has moved into place.

9. The control method according to claim 6, characterized in that, It also includes a reset spring (405), one end of which is fixedly connected to the fixed bracket (401), and the other end of which is fixedly connected to the limiting member (402).

10. The control method according to claim 9, characterized in that, The method also includes an abnormal handling step: when the locking state verification fails in step S5 or the cylinder (403) pressure rises abnormally, it is determined to be a jamming fault, and the pressure is immediately released and fed back to the human-machine interaction module (8) to trigger an alarm. The reset spring (405) uses its own elasticity to drive the limit member (402) to reset.

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