Electrically braked transmission mechanism of a multi-component injection molding machine and method for controlling the same

Abstract

The application discloses a kind of electric brake transmission mechanism of multi-component injection molding machine and its control method, including drive unit, including motor;First drive group, including speed reduction mechanism, power distribution mechanism and conversion mechanism, speed reduction mechanism receives the power of motor and carries out speed reduction transmission, power distribution mechanism distributes the power after speed reduction to two-way output, conversion mechanism converts rotary motion into the linear relative motion of two racks;Second drive group, including power distribution mechanism and conversion mechanism, the power distribution mechanism and conversion mechanism of second drive group are identical with the power distribution mechanism and conversion mechanism of first drive group Structure is symmetrically arranged;Synchronization mechanism, including central gear ring, with the power distribution mechanism of first drive group and second drive group simultaneously cooperate, to realize the synchronous transmission of first drive group and second drive group;Two sets of clamping half pieces are connected with the two racks of first drive group and second drive group respectively, realize four-point synchronous clamping action.

Description

Technical Field

[0001] This invention relates to the technical field of multi-component injection molding machines, and more particularly to an electric brake transmission mechanism for a multi-component injection molding machine and its control method. Background Technology

[0002] In multi-component two-platen injection molding machines, the mold closing process requires the guide column to transmit the thrust of the high-pressure cylinder to the movable platen. Before high-pressure mold locking, the guide column needs to be reliably clamped to ensure that the subsequent high-pressure cylinder can drive the movable platen to move towards the fixed platen via the guide column, completing the high-pressure clamping of the guide column. Traditional guide column clamping devices mainly use hydraulic drive.

[0003] like Figure 1 and Figure 2 As shown, the existing retaining maneuver brake device includes: a clamping cylinder 5, four clamping halves (1, 2, 3, 4), a clamping linkage rod 6, a clamping linkage plate 7, a clamping linkage plate fixing shaft 8, and an inductive switch fixing seat 9. The structural features of the existing technology are: clamping halves 1 and 3 are connected by the clamping linkage rod 6, and clamping halves 2 and 4 are connected by the clamping linkage rod 6; clamping halves 2 and 4 are connected by the clamping linkage plate 7 and rotate via the clamping linkage plate fixing shaft 8 to maintain equal vertical travel. The working principle of the existing technology is: when the clamping cylinder 5 extends 90mm, halves 1 and 2 perform a brake action, moving 90mm in opposite directions, and are detected by the inductive switch. Through the mechanical linkage mechanism of the clamping linkage rod 6 and the clamping linkage plate 7, the four clamping halves (1, 2, 3, 4) are ensured to clamp or release synchronously. If the rigidity of the aforementioned gate brake device is insufficient, bending and shaft wear will occur, resulting in poor brake synchronization. Furthermore, if one side is not in position, it will cause an alarm or insufficient contact surface with the gate brake teeth, leading to damage to the teeth on the gate brake or the teeth of the brake, or even breakage of the gate brake.

[0004] Existing technologies have the following drawbacks: High energy consumption: Hydraulic systems require continuous operation of the hydraulic pump, maintaining system pressure even when not clamping, resulting in significant energy waste; Complex maintenance: Hydraulic systems require regular hydraulic oil changes, seal checks, and pipeline maintenance, leading to high maintenance costs; Slow response speed: Hydraulic systems have fluid inertia and pressure build-up time, limiting response speed; Prone to oil leakage and pollution: Hydraulic systems are susceptible to oil leakage due to aging seals and pipeline damage, polluting the environment and affecting production; Poor precision control: Hydraulic systems struggle to achieve precise position and force control, with clamping accuracy affected by factors such as hydraulic oil temperature and viscosity; Easily worn clamping linkage plates: The clamping linkage plate structure relies on the rotation of a fixed shaft for motion transmission. After prolonged use, wear and gaps easily develop at the connection points between the fixed shaft and the linkage plate, leading to decreased synchronization and reduced service life; Large space occupation: Hydraulic systems require auxiliary equipment such as hydraulic stations and pipelines, occupying considerable space.

[0005] Although there are some electric clamping devices on the market, most of them use multiple motors to drive them separately or have complex transmission mechanisms, which are costly, have complex structures, and make it difficult to guarantee synchronization performance. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] The technical problem to be solved by the present invention is to provide an electric brake transmission mechanism and its control method for a multi-component injection molding machine, which solves the technical problems of high energy consumption, complex maintenance, easy oil leakage, poor accuracy and easy wear of clamping linkage plate of existing hydraulic clamping devices, and at the same time solves the problems of high cost, complex structure and poor synchronization of existing electric clamping devices.

[0008] (II) Technical Solution

[0009] The solution adopted by this invention to solve the above-mentioned technical problems is an electric brake transmission mechanism for a multi-component injection molding machine, used to achieve four-point synchronous clamping action, including...

[0010] A drive unit, which includes a motor;

[0011] The first drive group includes a reduction transmission mechanism, a power distribution mechanism, and a conversion mechanism. The reduction transmission mechanism receives the power from the motor and performs reduction transmission. The power distribution mechanism distributes the reduced power to two outputs. The conversion mechanism converts the rotational motion into the linear relative motion of the two racks.

[0012] The second drive group includes a power distribution mechanism and a conversion mechanism. The power distribution mechanism and conversion mechanism of the second drive group have the same structure as the power distribution mechanism and conversion mechanism of the first drive group and are symmetrically arranged.

[0013] A synchronization mechanism includes a central large gear ring, which is located between the first drive group and the second drive group and cooperates with the power distribution mechanism of the first drive group and the second drive group to realize synchronous transmission of the first drive group and the second drive group.

[0014] Two sets of clamping halves are connected to the two racks of the first drive group and the second drive group respectively, realizing four-point synchronous clamping action. When the rack moves outward, the four clamping halves of each group move towards the center synchronously, realizing four-point synchronous clamping action; when the rack moves inward, the four clamping halves of each group move outward synchronously, realizing the release action.

[0015] Specifically, the motor is controlled by a controller that enables three control modes: position control, speed control, and torque control, which can be switched according to actual working conditions. The controller employs a PLC system, capable of acquiring the motor's position, speed, and torque signals in real time and performing precise control according to a preset program.

[0016] The above scheme achieves four-point synchronous clamping through the four clamping halves of each group, ensuring uniform force on the tie rod and avoiding damage or wear to the tie rod caused by single-point or double-point clamping; a central large gear ring is used as a synchronization mechanism to achieve mechanical forced synchronous transmission with high synchronization accuracy; the two drive groups are symmetrically arranged, resulting in overall force balance.

[0017] In some embodiments, the reduction transmission mechanism includes at least two stages of gear reduction, which significantly reduces the motor speed and increases the torque by multiples; the power distribution mechanism includes an input gear and at least two output gears, with the speed and torque of the two outputs being exactly the same, ensuring that the two racks move synchronously.

[0018] In some embodiments, the conversion mechanism includes two synchronously rotating gears that mesh with two racks respectively, causing the two racks to move relative to each other.

[0019] In some embodiments, the first drive group includes a first gear, a second gear, a third gear, a fourth gear, a fifth gear, a sixth gear, a seventh gear, an eighth gear, a first rack, and a second rack. The first gear is connected to the motor, the first gear meshes with the second gear, the second gear and the third gear are coaxially arranged, the third gear meshes with the fourth gear, the fourth gear simultaneously meshes with the central large gear ring, the fifth gear, and the sixth gear. The fifth gear and the seventh gear are coaxially arranged, the sixth gear and the eighth gear are coaxially arranged, the seventh gear meshes with the first rack, and the eighth gear meshes with the second rack.

[0020] The second drive group includes a fourth gear, a fifth gear, a sixth gear, a seventh gear, an eighth gear, a first rack, and a second rack. The fourth gear meshes with the central large gear ring, as well as the fifth and sixth gears. The fifth and seventh gears are coaxially arranged, the sixth and eighth gears are coaxially arranged, the seventh gear meshes with the first rack, and the eighth gear meshes with the second rack.

[0021] In some embodiments, the parameters of the seventh gear and the eighth gear are the same, and the parameters of the first rack and the second rack are the same, to ensure that the travel distances of the first rack and the second rack are equal.

[0022] Specifically, the reduction transmission mechanism includes a first gear, a second gear, and a third gear; the power distribution mechanism includes an input gear and two output gears, the fourth gear serves as the input gear and meshes with the fifth and sixth gears, the fifth and sixth gears serve as the two output gears; the conversion mechanism includes a fifth gear, a sixth gear, a seventh gear, and an eighth gear.

[0023] In some embodiments, the central large gear ring meshes with the fourth gear of the first drive group and the fourth gear of the second drive group. Since the parameters of the fourth gears of the first drive group and the fourth gears of the second drive group are exactly the same and they are arranged symmetrically relative to the central large gear ring, when one group is driven, the other group is forced to drive synchronously, thus achieving mechanical forced synchronization.

[0024] In some embodiments, the central large gear ring is an external gear ring structure, and the fourth gears of the first drive group and the second drive group are both external gear ring structures.

[0025] In some embodiments, the motor is a servo motor that drives the first drive group or the second drive group through an output shaft, or drives the first drive group or the second drive group through an intermediate transmission mechanism.

[0026] In some embodiments, the two racks in the first drive group and the second drive group move in opposite directions to achieve opposite clamping or opposite releasing actions.

[0027] In some embodiments, the center of the central large gear ring is located at the center of symmetry between the first drive group and the second drive group, and ensures the synchronicity of the movement of the two sets of racks by synchronously meshing with the power distribution mechanisms of the first drive group and the second drive group; furthermore, the power distribution mechanism and conversion mechanism of the first drive group are completely identical to those of the second drive group, and are symmetrically distributed about the center of the central large gear ring, ensuring that the system has internal force balance during movement, no additional bending moment, smoother operation, more uniform wear, and better long-term accuracy retention.

[0028] In some embodiments, a position detection unit is further included, disposed on the rack or clamping half, for detecting the clamping position.

[0029] In some embodiments, the position detection unit includes a proximity switch, a displacement sensor, a photoelectric sensor, or an encoder.

[0030] In some embodiments, proximity switches are used as position detection elements. Two proximity switches are installed at the end of the travel of each rack, respectively for detecting the clamping and releasing positions. A total of eight proximity switches are installed, each mounted in a fixed position on the frame, and a sensing block is mounted on the rack. When the rack moves to a preset position, the sensing block triggers the corresponding proximity switch, which transmits a signal to the controller. The controller determines whether the target position has been reached based on the signal.

[0031] Specifically, the clamping process:

[0032] Upon receiving the clamping command, the controller starts the motor, which rotates according to a preset speed curve. The motor's power is transmitted to the second gear via the first gear; after the first stage of reduction, the speed decreases while the torque increases. The second gear drives the coaxial third gear to rotate, which then transmits power to the fourth gear. After the second stage of reduction, the speed decreases again while the torque increases again. Simultaneously, the fourth gear meshes with the central large gear ring, driving it to rotate as well. Because the central large gear ring simultaneously meshes with the fourth gear of the second drive group, its rotation forces the fourth gear to rotate synchronously, thus achieving forced synchronous transmission between the first and second drive groups. Through the mechanical forced synchronization effect of the central large gear ring, the synchronization error between the two drive groups can be controlled within 0.1mm.

[0033] In the first drive group, the fourth gear meshes with both the fifth and sixth gears simultaneously, distributing power to two paths. The fifth gear drives the coaxial seventh gear to rotate, and the seventh gear meshes with the first rack, converting the rotational motion into linear motion of the first rack. Assuming the fourth gear rotates counterclockwise, the fifth and seventh gears rotate clockwise, driving the first rack downwards. Similarly, the sixth gear drives the coaxial eighth gear to rotate, and the eighth gear meshes with the second rack. Since the eighth gear is positioned opposite the seventh gear, it also rotates clockwise, but because it is below the second rack, it drives the second rack upwards, moving towards the first rack.

[0034] Under the synchronous action of the central large gear ring, the first and second racks of the second drive group also move in opposite directions synchronously, and their speed and stroke are completely consistent with those of the racks of the first drive group.

[0035] The four clamping halves move synchronously towards the center as the rack moves in opposite directions, ultimately clamping the tie post and completing the clamping action. During the clamping process, the controller monitors the motor position and torque in real time. When the sensor on the rack triggers the clamping position proximity switch, the proximity switch sends a position signal to the controller. Upon receiving the signal, the controller switches the motor to torque control mode, outputting a constant clamping torque to achieve constant force clamping, preventing damage to the tie post from excessive clamping force or loosening due to insufficient clamping force.

[0036] Release process:

[0037] Upon receiving the release command, the controller reverses the rotation of the motor. The transmission process is the same as the clamping process, but the direction of movement is opposite. The first and second racks of the first drive group move in opposite directions, and the first and second racks of the second drive group also move in opposite directions. The four clamping halves synchronously retract outwards, releasing the tie rod. When the sensing block on the rack triggers the release-in-place proximity switch, the controller stops the motor, completing the release action.

[0038] The solution adopted by the present invention to solve the above-mentioned technical problem is a control method for an electric brake transmission mechanism applied to a multi-component injection molding machine as described above, comprising the following steps:

[0039] S1: The motor starts and is driven by the reduction gear mechanism of the first drive group;

[0040] S2: The decelerated power is simultaneously transmitted to the power distribution mechanism of the first and second drive groups through the central large gear ring, achieving forced synchronization;

[0041] S3: Within the first and second drive groups, power is distributed to the two paths via a power distribution mechanism;

[0042] S4: The conversion mechanism converts the rotary motion into the linear relative motion of the rack;

[0043] S5: The four clamping halves of the two groups are clamped or released synchronously under the drive of the rack and pinion.

[0044] S6: The motor stops after the clamping or releasing action is completed.

[0045] In some embodiments, step S6: After the position detection unit detects the preset position, the motor stops.

[0046] In some embodiments, in step S2, the mechanical forced synchronization effect of the central large gear ring makes the synchronization error between the first drive group and the second drive group less than 0.2mm.

[0047] In some embodiments, in step S5, adjustable constant force clamping is achieved through the torque control function of the motor.

[0048] In some embodiments, a synchronization monitoring step is also included: real-time detection of the position difference between the first drive group and the second drive group, and issuing an alarm signal when the position difference exceeds a threshold.

[0049] (III) Beneficial Effects

[0050] Compared with the prior art, the present invention designs an electric brake transmission mechanism and its control method for a multi-component injection molding machine.

[0051] (1) This invention solves the technical problems of high energy consumption, complex maintenance, easy oil leakage, poor accuracy and easy wear of clamping linkage plate in existing hydraulic clamping devices, and at the same time solves the problems of high cost, complex structure and poor synchronization of existing electric clamping devices.

[0052] (2) The present invention is electrified and energy-saving; the four corner brakes are fully synchronized, with low noise, and there is no asynchronous hydraulic cylinders on both sides, with two brake sounds on the left and right sides. Electric control can achieve lower noise than hydraulic cylinders for buffering; there is only one servo motor, while existing technologies use two electric cylinders or two servo motors, which is lower in cost; the same gear is divided into two racks to ensure synchronization, while the electric servo motors used in the industry still require an intermediate linkage mechanism for synchronization, resulting in low rigidity and lifespan.

[0053] (3) The present invention achieves four-point synchronous clamping through four clamping halves in each group, so that the tie rod is subjected to uniform force and avoids damage or wear of the tie rod caused by single-point or double-point clamping; the central large gear ring is used as a synchronization mechanism to achieve mechanical forced synchronous transmission with high synchronization accuracy; the two drive groups are symmetrically arranged and the overall force is balanced. Attached Figure Description

[0054] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 This is a schematic diagram of a hydraulic clamping device in the prior art.

[0056] Figure 2 This is a partial structural diagram of a hydraulic clamping device in the prior art;

[0057] Figure 3 This is a schematic diagram of the electric brake transmission mechanism of a multi-component injection molding machine according to the present invention.

[0058] Figure 4 This is a schematic diagram of the structure of the first drive group of the present invention;

[0059] Figure 5 This is a schematic diagram of the first drive group of the present invention from another angle.

[0060] The component names corresponding to the various reference numerals in the figure are as follows: 10, clamping half piece; 100, motor; 200, first drive group; 300, second drive group; 400, central large gear ring; 101, first gear; 102, second gear; 103, third gear; 104, fourth gear; 105, fifth gear; 106, sixth gear; 107, seventh gear; 108, eighth gear; 109, first rack; 110, second rack. Detailed Implementation

[0061] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0062] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0063] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0064] It should be noted that the following description covers various aspects of embodiments within the scope of the appended claims. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0065] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0066] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0067] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0068] like Figures 3-5As shown, this invention provides an electric brake transmission mechanism for a multi-component injection molding machine, used to achieve four-point synchronous clamping action. It includes a drive unit comprising a motor 100; a first drive group 200 comprising a reduction transmission mechanism, a power distribution mechanism, and a conversion mechanism. The reduction transmission mechanism receives power from the motor 100 and performs reduction transmission; the power distribution mechanism distributes the reduced power to two output paths; and the conversion mechanism converts rotational motion into linear relative motion between two racks. A second drive group 300 includes a power distribution mechanism and a conversion mechanism. The power distribution mechanism and conversion mechanism of the second drive group 300 have the same structure and are symmetrical with those of the first drive group 200. The system includes a synchronization mechanism comprising a central large gear ring 400 located between the first drive group 200 and the second drive group 300, cooperating simultaneously with the power distribution mechanisms of both groups to achieve synchronous transmission. Two sets of clamping halves 10 are connected to two racks of the first and second drive groups 200 respectively, enabling four-point synchronous clamping. When the racks move outward, the four clamping halves 10 of each group synchronously move towards the center, achieving four-point synchronous clamping. When the racks move inward, the four clamping halves 10 of each group synchronously move outward, achieving a release action. Specifically, the motor 100 uses a controller to implement three control modes: position control, speed control, and torque control, which can be switched according to actual working conditions. The controller employs a PLC control system, capable of real-time acquisition of the motor 100's position, speed, and torque signals, and precise control according to a preset program. Using the above scheme, four-point synchronous clamping is achieved through the four clamping halves 10 in each group, so that the tie rod is subjected to uniform force and avoids damage or wear to the tie rod caused by single-point or double-point clamping; the central large gear ring 400 is used as a synchronization mechanism to achieve mechanical forced synchronous transmission with high synchronization accuracy; the two drive groups are symmetrically arranged, and the overall force is balanced.

[0069] In some embodiments, the reduction transmission mechanism includes a two-stage gear reduction, which significantly reduces the motor speed by 100 rpm and increases the torque by a factor of two; the power distribution mechanism includes an input gear and at least two output gears, with the speed and torque of the two outputs being exactly the same, ensuring that the two racks move synchronously. In some embodiments, the conversion mechanism includes two synchronously rotating gears that mesh with the two racks respectively, causing the two racks to move relative to each other.

[0070] In some embodiments, the first drive group 200 includes a first gear 101, a second gear 102, a third gear 103, a fourth gear 104, a fifth gear 105, a sixth gear 106, a seventh gear 107, an eighth gear 108, a first rack 109, and a second rack 110. The first gear 101 is connected to the motor 100. The first gear 101 meshes with the second gear 102. The second gear 102 and the third gear 103 are coaxially arranged. The third gear 103 meshes with the fourth gear 104. The fourth gear 104 simultaneously meshes with the central large gear ring 400, the fifth gear 105, and the sixth gear 106. The fifth gear 105 and the seventh gear 107 are coaxially arranged. The sixth gear 106 and the eighth gear 108 are coaxially arranged. The seventh gear 107 meshes with the first rack 109, and the eighth gear 108 meshes with the second rack 110. The second drive group 300 includes a fourth gear 104, a fifth gear 105, a sixth gear 106, a seventh gear 107, an eighth gear 108, a first rack 109, and a second rack 110. The fourth gear 104 meshes with the central large gear ring 400, as well as the fifth gear 105 and the sixth gear 106. The fifth gear 105 and the seventh gear 107 are coaxially arranged. The sixth gear 106 and the eighth gear 108 are coaxially arranged. The seventh gear 107 meshes with the first rack 109, and the eighth gear 108 meshes with the second rack 110. In some embodiments, the parameters of the seventh gear 107 and the eighth gear 108 are the same, and the parameters of the first rack 109 and the second rack 110 are the same, to ensure that the travel distances of the first rack 109 and the second rack 110 are equal. Specifically, the reduction transmission mechanism includes the first gear 101, the second gear 102, and the third gear 103; the power distribution mechanism includes one input gear and two output gears, the fourth gear 104 serves as the input gear and meshes with the fifth gear 105 and the sixth gear 106, the fifth gear 105 and the sixth gear 106 serving as two output gears; the conversion mechanism includes the fifth gear 105, the sixth gear 106, the seventh gear 107, and the eighth gear 108.

[0071] In some embodiments, the central large gear ring 400 meshes with the fourth gear 104 of the first drive group 200 and the fourth gear 104 of the second drive group 300. Since the parameters of the fourth gear 104 of the first drive group 200 and the fourth gear 104 of the second drive group 300 are identical and symmetrically arranged relative to the central large gear ring 400, when one group is driven, the other group is forced to drive synchronously, achieving mechanical forced synchronization. In some embodiments, the central large gear ring 400 is an external gear ring structure, and the fourth gear 104 of both the first drive group 200 and the second drive group 300 are external gear ring structures.

[0072] In some embodiments, the motor 100 is a servo motor 100, which drives the first drive group 200 through its output shaft. In some embodiments, the two racks in the first drive group 200 and the second drive group 300 move in opposite directions to achieve opposing clamping or opposing releasing actions. In some embodiments, the center of the central large gear ring 400 is located at the center of symmetry of the first drive group 200 and the second drive group 300, and ensures the synchronicity of the movement of the two sets of racks by synchronously meshing with the power distribution mechanisms of the first drive group 200 and the second drive group 300; furthermore, the power distribution mechanism and conversion mechanism of the first drive group 200 and the power distribution mechanism and conversion mechanism of the second drive group 300 are completely identical and symmetrically distributed about the center of the central large gear ring 400, ensuring that the system has internal force balance during movement, no additional bending moment, smoother operation, more uniform wear, and better long-term accuracy retention.

[0073] In some embodiments, a position detection unit is further included, disposed on the rack, for detecting the clamping position. In some embodiments, proximity switches are used as position detection elements. Two proximity switches are respectively disposed at the end of the stroke of each rack, for detecting the clamping position and the release position. A total of eight proximity switches are disposed, each mounted at a fixed position on the frame, and a sensing block is mounted on the rack. When the rack moves to a preset position, the sensing block triggers the corresponding proximity switch, which transmits a signal to the controller. The controller determines whether the target position has been reached based on the signal.

[0074] Specifically, the clamping process is as follows: After receiving the clamping command, the controller starts the motor 100, which rotates according to a preset speed curve. The power of the motor 100 is transmitted to the second gear 102 through the first gear 101. After the first stage of deceleration, the speed decreases and the torque increases. The second gear 102 drives the coaxial third gear 103 to rotate, and the third gear 103 transmits power to the fourth gear 104. After the second stage of deceleration, the speed decreases again and the torque increases again. While rotating, the fourth gear 104 meshes with the central large gear ring 400, driving the central large gear ring 400 to rotate. Since the central large gear ring 400 is simultaneously meshed with the fourth gear 104 of the second drive group 300, the rotation of the central large gear ring 400 forces the fourth gear 104 to rotate synchronously, thereby achieving forced synchronous transmission between the first drive group 200 and the second drive group 300. Through the mechanical forced synchronization effect of the central large gear ring 400, the synchronization error between the two drive groups can be controlled within 0.1mm. In the first drive group 200, the fourth gear 104 meshes with both the fifth gear 105 and the sixth gear 106, distributing power to two paths. The fifth gear 105 drives the coaxial seventh gear 107 to rotate, and the seventh gear 107 meshes with the first rack 109, converting the rotational motion into the linear motion of the first rack 109. Assuming the fourth gear 104 rotates counterclockwise, the fifth gear 105 and the seventh gear 107 rotate clockwise, driving the first rack 109 to move downwards. Similarly, the sixth gear 106 drives the coaxial eighth gear 108 to rotate, and the eighth gear 108 meshes with the second rack 110. Since the eighth gear 108 is positioned opposite the seventh gear 107, it also rotates clockwise, but because it is below the second rack 110, it drives the second rack 110 to move upwards, moving towards the first rack 109. Under the synchronous action of the central large gear ring 400, the first rack 109 and the second rack 110 of the second drive group 300 also move synchronously towards each other, and their speed and stroke are completely consistent with those of the racks of the first drive group 200. The four clamping halves 10 move synchronously towards the center along with the racks, ultimately clamping the tie post and completing the clamping action. During the clamping process, the controller monitors the position and torque of the motor 100 in real time. When the sensing block on the rack triggers the clamping proximity switch, the proximity switch sends a position signal to the controller. Upon receiving the signal, the controller switches the motor 100 to torque control mode, outputting a constant clamping torque to achieve constant force clamping, preventing excessive clamping force from damaging the tie post or insufficient clamping force from causing loosening.

[0075] Release process: After receiving the release command, the controller rotates the motor 100 in the opposite direction. The transmission process is the same as the clamping process, but the direction of movement is reversed. The first rack 109 and the second rack 110 of the first drive group 200 move in opposite directions, and the first rack 109 and the second rack 110 of the second drive group 300 also move in opposite directions. The four clamping halves 10 synchronously retract outwards, releasing the tie rod. When the sensing block on the rack triggers the release-in-place proximity switch, the controller controls the motor 100 to stop, completing the release action.

[0076] The present invention also provides a control method for an electric brake drive mechanism applied to a multi-component injection molding machine as described above, comprising the following steps:

[0077] S1: Motor 100 starts and is driven by the reduction transmission mechanism of the first drive group 200;

[0078] S2: The decelerated power is simultaneously transmitted to the power distribution mechanism of the first drive group 200 and the second drive group 300 through the central large gear ring 400 to achieve forced synchronization;

[0079] S3: Within the first drive group 200 and the second drive group 300, power is distributed to the two paths through the power distribution mechanism;

[0080] S4: The conversion mechanism converts the rotary motion into the linear relative motion of the rack;

[0081] S5: The four clamping halves 10 in each group perform clamping or releasing actions synchronously under the drive of the rack and pinion.

[0082] S6: After the clamping or releasing action is completed, the motor stops at 100.

[0083] In some embodiments, step S6: After the position detection unit detects the preset position, the motor 100 stops.

[0084] In some embodiments, in step S2, the mechanical forced synchronization effect of the central large gear ring 400 makes the synchronization error of the first drive group 200 and the second drive group 300 less than 0.2mm.

[0085] In some embodiments, in step S5, adjustable constant force clamping is achieved through the torque control function of the motor 100.

[0086] In some embodiments, a synchronization monitoring step is also included: real-time detection of the position difference between the first drive group 200 and the second drive group 300, and issuing an alarm signal when the position difference exceeds a threshold.

[0087] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0088] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electric brake transmission mechanism for a multi-component injection molding machine, used to achieve four-point synchronous clamping action, characterized in that: include A drive unit, which includes a motor (100); The first drive group (200) includes a speed reduction transmission mechanism, a power distribution mechanism and a conversion mechanism. The speed reduction transmission mechanism receives the power of the motor (100) and performs speed reduction transmission. The power distribution mechanism distributes the reduced power to two outputs. The conversion mechanism converts the rotational motion into the linear relative motion of the two racks. The second drive group (300) includes a power distribution mechanism and a conversion mechanism. The power distribution mechanism and conversion mechanism of the second drive group (300) have the same structure as the power distribution mechanism and conversion mechanism of the first drive group (200) and are symmetrically arranged. The synchronization mechanism includes a central large gear ring (400), which is located between the first drive group (200) and the second drive group (300) and cooperates with the power distribution mechanism of the first drive group (200) and the second drive group (300) to realize the synchronous transmission of the first drive group (200) and the second drive group (300). Two sets of clamping halves (10) are respectively connected to the two racks of the first drive group (200) and the second drive group (300) to realize four-point synchronous clamping action; The first drive assembly (200) includes a first gear (101), a second gear (102), a third gear (103), a fourth gear (104), a fifth gear (105), a sixth gear (106), a seventh gear (107), an eighth gear (108), a first rack (109), and a second rack (110). The first gear (101) is connected to the motor (100), the first gear (101) meshes with the second gear (102), and the second gear (102) meshes with the third gear (106). Gears (103) are coaxially arranged. The third gear (103) meshes with the fourth gear (104). The fourth gear (104) meshes with the central large gear ring (400), the fifth gear (105), and the sixth gear (106). The fifth gear (105) is coaxially arranged with the seventh gear (107). The sixth gear (106) is coaxially arranged with the eighth gear (108). The seventh gear (107) meshes with the first rack (109). The eighth gear (108) meshes with the second rack (110). The second drive group (300) includes a fourth gear (104), a fifth gear (105), a sixth gear (106), a seventh gear (107), an eighth gear (108), a first rack (109), and a second rack (110). The fourth gear (104) meshes with the central large gear ring (400) and the fifth gear (105) and the sixth gear (106). The fifth gear (105) is coaxial with the seventh gear (107). The sixth gear (106) is coaxial with the eighth gear (108). The seventh gear (107) meshes with the first rack (109). The eighth gear (108) meshes with the second rack (110). The central large gear ring (400) meshes with the fourth gear (104) of the first drive group (200) and the fourth gear (104) of the second drive group (300).

2. The electric brake transmission mechanism of the multi-component injection molding machine according to claim 1, characterized in that: The reduction transmission mechanism includes at least two stages of gear reduction, and the power distribution mechanism includes one input gear and at least two output gears.

3. The electric brake transmission mechanism of the multi-component injection molding machine according to claim 1, characterized in that: The conversion mechanism includes two synchronously rotating gears that mesh with two racks respectively, causing the two racks to move relative to each other.

4. The electric brake transmission mechanism of the multi-component injection molding machine according to claim 1, characterized in that: The motor (100) is a servo motor (100) that drives the first drive group (200) through the output shaft, or drives the first drive group (200) through an intermediate transmission mechanism.

5. The electric brake transmission mechanism of the multi-component injection molding machine according to claim 1, characterized in that: The two racks in the first drive group (200) and the second drive group (300) move in opposite directions to achieve opposite clamping or opposite releasing actions.

6. The electric brake transmission mechanism of the multi-component injection molding machine according to claim 1, characterized in that: The center of the central large gear ring (400) is located at the center of symmetry between the first drive group (200) and the second drive group (300), and ensures the synchronicity of the movement of the two sets of racks by synchronously meshing with the power distribution mechanism of the first drive group (200) and the second drive group (300); and the power distribution mechanism and conversion mechanism of the first drive group (200) and the power distribution mechanism and conversion mechanism of the second drive group (300) are completely identical and are symmetrically distributed about the center of the central large gear ring (400).

7. The electric brake transmission mechanism of the multi-component injection molding machine according to claim 1, characterized in that: It also includes a position detection unit, which is disposed on the rack or clamping half (10) for detecting the clamping position.

8. A control method for an electric brake transmission mechanism applied to a multi-component injection molding machine as described in any one of claims 1-7, characterized in that: Includes the following steps: S1: The motor (100) starts and is driven by the reduction transmission mechanism of the first drive group (200); S2: The decelerated power is simultaneously transmitted to the power distribution mechanism of the first drive group (200) and the second drive group (300) through the central large gear ring (400) to achieve forced synchronization; S3: Within the first drive group (200) and the second drive group (300), power is distributed to the two paths through the power distribution mechanism; S4: The conversion mechanism converts the rotary motion into the linear relative motion of the rack; S5: The two sets of clamping halves (10) perform clamping or releasing actions synchronously under the drive of the rack and pinion; S6: After the clamping or releasing action is completed, the motor (100) stops.

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