An automatic balance device for a stripper, a control method and an injection molding machine

Abstract

This invention relates to an automatic ejector roller balancing device, control method, and injection molding machine. The device includes an ejector plate and at least two ejector rollers, each ejector roller being vertically and movably mounted on the front surface of the ejector plate; a balancing adjustment structure for adjusting the extension length of each ejector roller, the extension length being the vertical distance from the front end of the ejector roller to the ejector plate; and sensors, each sensor's detection end being detachably mounted on the corresponding ejector roller for determining whether the front ends of each ejector roller are on the same plane. The beneficial effects of this invention are: properly adjusted ejector rollers will not deviate when pushing the ejector plate, significantly improving the product yield rate, fundamentally solving the problem of ejector roller flatness, and extending the mold's service life; simultaneously, it can also provide feedback on imbalances in the mold's ejection mechanism, playing a crucial role in subsequent mold repair, maintenance, and service life.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment, and particularly to an automatic top roller balancing device and a control method for the automatic top roller balancing device, and also to an injection molding machine having the automatic top roller balancing device. Background Technology

[0002] Injection molding machines, also known as injection molding machines or injection molding machines, are the main molding equipment used to produce various shapes of plastic products from thermoplastic or thermosetting materials using plastic molds. After the injection molding machine completes the production of the plastic part (product), the ejector rollers symmetrically arranged on its ejector plate push the ejector plate, causing the ejector cylinders fixed on the ejector plate to move, thus ejecting the plastic part and waste material out of the mold cavity or core, achieving the demolding effect. During the ejection process, if the height of the ejector rollers is unbalanced, ejection misalignment is very likely to occur. If the injection molding machine continues to operate under ejection misalignment, the ejector rods will continue to wear, eventually leading to wear and burrs on the ejector rods, making ejection difficult. If forced ejection is attempted, it may cause the ejector rods to break. In addition, during the early wear, black iron filings will fall onto the product, causing black spot contamination and affecting product quality. More importantly, ejection misalignment will cause deviations in the parallelism between the mold plates, thus compromising machine performance. The mold may be damaged due to wear, reducing the service life of both the machine and the mold, and compromising the product's yield rate.

[0003] Current solutions include improving the flatness of the ejector plate of the injection molding machine and increasing the machining accuracy of the ejector roller length to adjust the flatness. Alternatively, an elastomer can be added to the front end of the ejector roller to amplify the flatness error, but these solutions cannot fundamentally solve the problem of the ejector roller front ends not being on the same flatness.

[0004] Chinese patent "A Parallelism Compensation Control System for Multi-Material Injection Molding Machine Templates" (Application No.: 2018111096148, Application Date: 20180921) proposes a device including a moving template, compensation cylinders, and a rotating template. Four sets of compensation cylinders are symmetrically installed around the rotating template. The lower end of each compensation cylinder set is connected to the moving template, and the upper end presses against the edge of the rotating template. Displacement detection devices, corresponding to the compensation cylinder sets, are installed on the moving template. The solution involves detecting the movement distance through each displacement monitoring device during demolding and comparing the results to determine if the moving template is under balanced force. If not, parallelism compensation is performed using the compensation cylinder sets to ensure the parallelism between the mold plates. While this achieves the goal of protecting the mold from damage, the judgment is based on correction only when parallelism problems occur, which carries the risk of mold wear due to unbalanced force during the detection process. Therefore, it does not fundamentally solve the problem.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes an automatic top roller balancing device, a control method, and an injection molding machine. It designs a device that can automatically adjust the extension length of the top roller based on sensor detection, and a corresponding control method to achieve the goal of automatically adjusting the front ends of each top roller to be on the same plane, thereby solving the aforementioned technical problems.

[0007] To achieve the above-mentioned objectives, the following technical solution is adopted:

[0008] An automatic balancing device for a top roller, the device comprising,

[0009] The ejector plate and at least two ejector rods are vertically and movably mounted on the front plate of the ejector plate, so that the ejector rods can be extended and shortened along the axial direction during adjustment.

[0010] The balance adjustment structure is used to adjust the extension length of each top roller, wherein the extension length is the vertical distance from the front end of the top roller to the top plate; the balance adjustment structure allows the extension length of the top roller to be adjusted directly as needed.

[0011] The ejector plate has one surface as the contact surface of the front end of the ejector pin, which serves as a reference for adjusting the balance of the ejector pin.

[0012] The sensors, with their respective detection ends detachably mounted on the corresponding ejector pins, are used to determine whether the front ends of each ejector pin are on the same plane. Based on this determination, the balance adjustment structure is controlled to adjust the extension length of each ejector pin until the front ends of each ejector pin are on the same plane parallel to the reference plane of the ejector plate.

[0013] Furthermore, the balance adjustment structure includes a top roller connection structure and an adjustment drive structure; the top roller connection structure includes an adjustment part provided at the end of each top roller and mounting holes symmetrically distributed on the ejector plate, each corresponding to one of the top rollers.

[0014] Furthermore, the outer ring of the adjustment part is provided with threads; the inner wall of the mounting hole is provided with threads corresponding to the threads of the adjustment part; the ejector plate is also provided with a locking structure corresponding to each ejector pin.

[0015] The adjustment drive device includes a motor and a rotor, with the motor and rotor being connected in a drive connection, and the rotor being mounted on a top roller.

[0016] Furthermore, the mounting hole for the top roller penetrates the ejector plate; the diameter of the adjustment part is the same as the inner diameter of the mounting hole, and the adjustment part extends outward from the rear plate surface of the ejector plate; the ejector plate is also provided with a locking structure corresponding to each top roller.

[0017] The adjustment drive device is a jack that corresponds to each top rod, and the movable end of the jack is connected to the adjustment part provided at the end of the top rod.

[0018] Furthermore, the sensor is a pressure sensor, and each detection end of the sensor is detachably installed on the corresponding top roller.

[0019] A control method for an automatic balancing device for a top roller as described above, comprising the following control steps:

[0020] Step 1: Install each detection end of the sensor onto the corresponding top roller and set the preset value;

[0021] Step 2: Control the movement of the ejector plate, push the front end of the ejector roller closer to the ejector plate;

[0022] Step 3: Balance and adjust the extension length of each ejector pin to increase the pressure of the ejector pin on the ejector plate to the predetermined value;

[0023] Step 4: Once the extension length of the top rod no longer changes, the adjustment is complete.

[0024] Furthermore, the control steps include:

[0025] Step 101: Install the detection end of the pressure sensor on each top roller;

[0026] Step 102: Set the preset pressure value for the pressure sensor;

[0027] Step 103: Control the movement of the ejector plate. When any ejector pin contacts the ejector plate and the pressure value measured at the corresponding detection end changes, stop the movement of the ejector plate.

[0028] Step 104: Activate one of the adjustment drive structures, and through the adjustment drive structure, drive the corresponding top roller connection structure and extend the extension length of the top roller to increase the pressure of the top roller on the ejector plate until the pressure reading measured by the corresponding pressure sensor reaches the predetermined pressure value, and then stop the corresponding adjustment drive structure.

[0029] Step 105: Perform Step 4 sequentially or simultaneously on the remaining top rollers until the pressure readings measured at the corresponding detection ends on each top roller reach the predetermined pressure value.

[0030] Step 106: Hold each top roller at the predetermined pressure value, fix the position of each top roller, and turn off the power to the motor;

[0031] Step 107: Control the ejector plate to return to its original position to end this adjustment.

[0032] Through the above control method, the ejector roller adjusts the extension length of the ejector plate to the front end of the ejector roller through the balance adjustment structure; by making the pressure on each ejector roller the same, it is determined that the front ends of each ejector roller are located on the same plane, and this plane is parallel to the contact surface of the ejector plate; the adjusted ejector roller can push the ejector plate forward with balanced force, and there will be no ejection deviation; it can fundamentally solve the problem of ejector roller flatness, thus extending the service life of the mold; at the same time, if it can also provide feedback on the imbalance of the ejection mechanism of the mold itself, it will play an extremely important role in the later maintenance, repair and service life of the mold.

[0033] Furthermore, during steps 101 to 103, each top roller is fixed to the top plate by a corresponding locking structure;

[0034] Before step 104 begins and until step 105 ends, the locking structure unlocks the top roller, allowing the motor to rotate the top roller via the rotor, thus extending the extension length of the top roller.

[0035] Step 106 until the adjustment is complete, the position of the top rollers is locked again by the locking structure, so that each top roller and the ejector plate become a whole.

[0036] Furthermore, the pressure preset value should be set as small as possible within the accurate range of the pressure sensor. While ensuring measurement accuracy, this will reduce the interference of pressure causing deformation of the ejector plate on the adjustment judgment.

[0037] An injection molding machine having any of the above-described automatic top roller balancing devices.

[0038] At the same time, the present invention has a simple structure, significant effects, and is suitable for widespread use.

[0039] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0040] Figure 1 A schematic diagram of the automatic balancing device for the top roller with the detection end located at the front end of the top roller provided in Embodiment 1 of the present invention;

[0041] Figure 2 Schematic diagram of the automatic balancing device for the top roller with the detection end located in the middle of the top roller provided in Embodiment 1 of the present invention;

[0042] Figure 3 A schematic diagram of the automatic balancing device for the top roller with the detection end located at the end of the top roller provided in Embodiment 1 of the present invention;

[0043] Figure 4 A schematic diagram of the automatic balancing device for the top roller provided in Embodiment 4 of the present invention;

[0044] Figure 5A schematic flowchart of the control method for the automatic balancing device for the top roller provided by the present invention.

[0045] The main components in the diagram are: 1. Ejector plate; 2. Ejector roller; 3. Balance adjustment structure; 4. Ejector roller connection structure; 5. Adjustment drive device; 6. Detection end; 7. Locking structure. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0047] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] like Figures 1 to 4 As shown, the present invention introduces an automatic balancing device for top rollers, comprising: a top plate 1, at least two top rollers 2 symmetrically arranged on the front plate surface of the top plate 1, each top roller 2 being vertically and axially movable connected to the front plate surface of the top plate 1; a balancing adjustment structure 3 for adjusting the extension length of each top roller 2; and a sensor that automatically adjusts the extension length of the top roller 2 by comparing the measured value with a preset value.

[0050] In this invention, the extension length refers to the vertical distance from the front end of the top roller 2 to the top plate 1.

[0051] During the demolding process, if the front end of ejector roller 2 is unbalanced when pushing the ejector plate forward, the roller will continuously wear down during the back-and-forth ejection motion. Eventually, the roller will become worn and splintered, making it difficult to complete the ejection process. Forcing the ejector out may cause it to break. Additionally, during the initial wear phase, black metal shavings will fall onto the product, causing black speckled contamination and affecting product quality.

[0052] In this invention, the ejector roller 2 is movably connected to the ejector plate 1, and the ejector roller 2 can extend and shorten along the axial direction. The extension length of the ejector roller 2 from the ejector plate 1 to the front end of the ejector roller 2 is adjusted by the balance adjustment structure 3. By making the pressure on each ejector roller 2 the same, it is determined that the front ends of each ejector roller are located on the same plane, and this plane is parallel to the contact surface of the ejector plate. Through the above technical solution, the adjusted ejector roller 2 can push the ejector plate forward with balanced force, without ejection deviation, reducing ejection abnormalities caused by insufficient flatness of the ejector roller, and significantly improving the product qualification rate. It fundamentally solves the problem of the mold not being able to be ejected in an balanced manner due to insufficient flatness of the front end of the ejector roller, and extends the service life of the mold. At the same time, it can also provide feedback on the imbalance of the ejection mechanism of the mold itself, which plays an extremely important role in the later maintenance, upkeep and service life of the mold.

[0053] The sensor can be placed in any location, such as on the ejector plate 1, on the injection molding machine body, or on a dedicated mounting bracket, as long as it allows for easy installation of the sensor-connected detection end 6 onto the ejector roller 2 without unnecessarily affecting the adjustment process.

[0054] The ejector plate is the mold pusher plate of the injection molding machine, used to push the mold to move horizontally during demolding.

[0055] Example 1

[0056] In this embodiment, as Figures 1 to 3 As shown, the balance adjustment structure 3 in this automatic balancing device for the top roller adopts a threaded structure. The balance adjustment structure 3 includes a top roller connecting structure 4 and an adjustment drive structure. The top roller connecting structure 4 includes an adjustment part provided at the end of the top roller 2 and mounting holes symmetrically distributed on the ejector plate 1 corresponding to each adjustment part. The outer ring of the adjustment part is provided with a thread. The inner wall of the mounting hole is provided with a thread corresponding to the thread of the adjustment part, so that the adjustment part can be inserted into the corresponding mounting hole through the engagement of the thread, and the top roller 2 can change the insertion degree of the adjustment part in the corresponding mounting hole by rotating along the axis, thereby adjusting the extension length from the front end of the top roller 2 to the ejector plate 1. The adjustment drive device 5 includes a motor and a rotor. After the motor is energized, it drives the top roller 2 through the rotor, so that the top roller 2 automatically completes the rotation along the axis.

[0057] In this embodiment, the sensor of this device is a pressure sensor. For the threaded ejector roller 2 mounting structure, when the ejector roller 2 pushes the ejector plate, each point of the ejector roller 2 is only subjected to the reaction force of the ejector plate. Therefore, the detection end 6 of the pressure sensor can be set as follows: Figures 1 to 3 The detection end 6 can be added by cutting off the top roller 2 at any position, such as the front end, the rear end, or even any position in the middle of the top roller 2.

[0058] In this embodiment, each of the top rollers 2 of the device is also provided with a locking structure 7. Each locking structure 7 can fix the corresponding top roller 2 so that it cannot rotate along the axis, thereby ensuring that the length of each top roller 2 remains unchanged after the extension length is adjusted by the locking structure 7.

[0059] With the above-described configuration in this embodiment, the top roller 2 is connected to the ejector plate 1 via a threaded connection, thereby fixing the top roller 2 radially. The motor rotates the top roller 2 via a rotor, and changes the insertion degree of the end of the top roller 2 in the mounting hole via the thread, thus changing the extension length of the top roller 2. When the front end of each top roller 2 reaches the appropriate position, the corresponding locking structure 7 prevents each top roller 2 from rotating around the axis, so that each top roller 2 will not rotate around the axis on its own due to the pressure it receives during operation, thereby changing the extension length. This causes the front ends of each top roller 2 to be out of plane, resulting in a top roller deviation phenomenon.

[0060] Example 2:

[0061] The difference between this embodiment and the above embodiments is that this embodiment introduces a control method for an automatic balancing device for a top roller, the control steps of which include:

[0062] Step 1: Install each of the sensor's six detection ends onto the corresponding top roller 2 and set the predetermined value;

[0063] Step 2: Control the movement of the ejector plate 1, and push the front end of the ejector roller 2 closer to the ejector plate;

[0064] Step 3: Adjust the extension length of each push rod 2 by balancing the structure 3 to increase the pressure of the push rod 2 on the push pin plate 1 to the predetermined value;

[0065] Step 4: Once the extension length of the fixed top rod 2 no longer changes, the adjustment is complete.

[0066] In this embodiment, the adjustment of the ejector roller 2 is carried out before the injection molding process is carried out after the mold is replaced with a new one or after the injection molding machine has been demolded for a period of time. That is, the position of the front end of the ejector roller 2 is adjusted according to the contact surface between the ejector plate and each ejector roller 2 when the ejector plate is in the current position. The contact surface of the ejector plate can be regarded as the reference surface when adjusting the ejector roller 2. When the plane formed by the front ends of each ejector roller 2 is parallel to the reference surface, the adjustment is completed. In the adjustment process, in order to ensure the accuracy of the balance adjustment of the ejector roller 2, the placement position and angle of the ejector plate must be fixed.

[0067] In this embodiment, the predetermined value is set to a smaller value within the accurate range of the sensor as much as possible; this reduces the error of the detected value and thus improves the adjustment accuracy.

[0068] The adjusted ejector roller, during demolding, can push the ejector plate forward in a balanced manner, ensuring that the levelness between the molds is not affected during the pushing process. When a newly made mold is put into use for the first time, if the injection molding machine jams during the process of the ejector plate pushing the mold forward, the flatness of the ejector roller front end can be ignored, and it can be judged that the problem is caused by the imbalance of mold fitting, so that the staff can adjust and improve the mold in time.

[0069] Example 3:

[0070] The difference between this embodiment and the above embodiments is that this embodiment is a further description of the control method based on Embodiment 2. The control method includes,

[0071] Step 101: Install the detection end of the pressure sensor on each top roller;

[0072] Step 102: Set the preset pressure value for the pressure sensor;

[0073] Step 103: Control the movement of the ejector plate. When any ejector pin contacts the ejector plate and the pressure value measured at the corresponding detection end changes, stop the movement of the ejector plate.

[0074] Step 104: Activate one of the adjustment drive structures, and through the adjustment drive structure, drive the corresponding top roller connection structure and extend the extension length of the top roller to increase the pressure of the top roller on the ejector plate until the pressure reading measured by the corresponding pressure sensor reaches the predetermined pressure value, and then stop the corresponding adjustment drive structure.

[0075] Step 105: Perform Step 4 sequentially or simultaneously on the remaining top rollers until the pressure readings measured at the corresponding detection ends on each top roller reach the predetermined pressure value.

[0076] Step 106: Hold each top roller at the predetermined pressure value, fix the position of each top roller, and turn off the power to the motor;

[0077] Step 107: Control the ejector plate to return to its original position to end this adjustment.

[0078] When setting a pressure preset value, the mold is usually ejected in a balanced manner, and the preset value will be a balanced pressure, that is, the pressure of each ejector pin is the same. In special cases, the ejection is unbalanced, and the pressure preset value needs to be designed separately according to the actual situation.

[0079] Example 4:

[0080] The difference between this embodiment and the above embodiments is that this embodiment is based on the control method of Embodiment 3 combined with the automatic balancing device of the top roller in Embodiment 1, and further describes the control method, such as... Figure 5As shown, the control steps include:

[0081] Step 101: Install the detection end 6 of the pressure sensor on each top roller 2;

[0082] Step 102: Set the preset pressure value for the pressure sensor;

[0083] Step 103: Control the movement of the ejector plate 1. When any ejector pin 2 contacts the ejector plate and the pressure value measured at the corresponding detection end 6 changes, stop the movement of the ejector plate 1.

[0084] Step 204: The motor is powered on, and the first ejector pin 2 in contact with the ejector plate is rotated along the shaft through the corresponding rotor, increasing the extension length of the ejector pin 2 and increasing the pressure of the ejector pin 2 on the ejector plate until the pressure reading measured by the corresponding pressure sensor detection end 6 reaches the predetermined pressure value, and the rotation of the ejector pin 2 is stopped.

[0085] Step 205: Adjust the remaining top rollers 2 sequentially or simultaneously according to the implementation method of step 204, so that the pressure readings measured on each top roller 2 reach the predetermined pressure value, and stop rotating each remaining top roller 2.

[0086] Step 106: Keep each pusher 2 at the predetermined pressure length, lock the position of each pusher 2 so that the relative position of each pusher 2 and the push plate 1 will not change, and turn off the power to the motor.

[0087] Step 107: Control the ejector plate 1 to return to its original position, ending this adjustment.

[0088] In this embodiment, when the adjustment work begins, each top roller 2 is fixed to the ejector plate 1 by the corresponding locking structure 7; when the front end of each top roller 2 contacts the corresponding contact position of the ejector plate, the locking structure 7 unlocks the top roller 2, so that the motor can rotate the top roller 2 through the rotor to extend the extension length of the top roller 2; when the extension length of each top roller 2 is adjusted, the locking structure 7 locks the position of the top roller 2 again, so that each top roller 2 and the ejector plate 1 become a whole.

[0089] Preferably, in this embodiment, the predetermined value is set to a smaller value within the accurate range of the sensor, which can control the deformation of the ejector plate 1 caused by the pressure to a minimum, reduce the error caused by the deformation to adjust the extension length of the ejector roller 2, and reduce the energy consumption of a single adjustment.

[0090] The pressure measured by the pressure sensor is fixed at a predetermined value and used as an adjustment criterion. Similar to pressure value determination, size can also be used; for example, the pressure sensor can be replaced with an electronic ruler for balancing the top roller 2, with the original pressure sensor's measuring end replaced by the electronic ruler's contactor. Figure 1As shown, the sensor's detection end 6 is a contactor, which needs to be set at the front end of the top roller 2 to confirm the distance; the above replacement scheme only replaces the adjustment judgment method, and the adjustment mechanism of this device will not change accordingly.

[0091] Example 5:

[0092] The difference between this embodiment and the above embodiments is that the balance adjustment structure 3 of the automatic balancing device for the top roller adopts a hydraulic direct-push structure; as follows: Figure 4 As shown, the balance adjustment structure 3 includes a top roller connecting structure 4 and an adjustment driving structure; the top roller connecting structure 4 includes an adjustment part provided at the end of the top roller 2 and mounting holes symmetrically distributed on the ejector plate 1 corresponding to each adjustment part; the mounting holes penetrate the ejector plate, and the inner diameter of the mounting holes is less than or equal to the diameter of the front end of the top roller 2; the diameter of the adjustment part is the same as the inner diameter of the mounting hole, so that the adjustment part can be directly inserted into the corresponding mounting hole to fix each top roller 2 radially; and the adjustment part can move freely axially within the mounting hole, thereby adjusting the extension length of the front end of the top roller 2 to the ejector plate 1.

[0093] In this embodiment, the adjustment drive device 5 is a jack connected to the adjustment part at the end of the top rod 2; the adjustment part extends through the ejector plate 1 and the extension length of the top rod 2 is increased or decreased by the push of the adjustment part by the jack; the ejection direction of the jack is parallel to the axis of the top rod 2; the extension length of the adjustment part is within the adjustable length range of the extension length of the top rod 2.

[0094] In this embodiment, the sensor of this device is also a pressure sensor. Since there is friction on the axis of the top roller 2 between the adjustment part and the mounting hole, in order to make the adjustment effect of this device more accurate, the detection end 6 of the pressure sensor can be set at the front end of the top roller 2 or the middle position of the top roller 2.

[0095] In this embodiment, each top roller 2 of the device is also provided with a locking structure 7. Each locking structure 7 can fix the corresponding top roller 2 in the axial direction, so that the position of the top roller 2 is locked and its relative position with the ejector plate 1 will not change.

[0096] With the above-described configuration in this embodiment, the top roller 2 is fixed radially by inserting the adjustment part into the mounting hole, and the ejector plate 1 can slide freely axially. The motor rotates the top roller 2 through the rotor, and changes the insertion degree of the end of the top roller 2 in the mounting hole through the thread, thereby changing the extension length of the top roller 2. When the front end of each top roller 2 reaches the appropriate position, the corresponding locking structure 7 prevents each top roller 2 from rotating around the axis, so that each top roller 2 will not rotate around the axis on its own due to the pressure during operation, thereby changing the extension length, causing the front ends of each top roller 2 to be not on the same plane, resulting in a top deviation phenomenon.

[0097] Example 6

[0098] The difference between this embodiment and the above embodiments is that this embodiment is based on the control method of embodiment 3 combined with the automatic balancing device of the top roller 2 in embodiment 5, and further describes the control method, such as... Figure 5 As shown, compared to the control steps described in Embodiment 4, control steps 204 and 205 are different. Step 204 needs to be replaced with step 304, and step 205 needs to be replaced with step 305. The same control steps will not be described in detail here. The different control steps include:

[0099] Step 304: Control the jack corresponding to the first push rod 2 that contacts the ejector plate to move the push rod 2 forward, increase the extension length of the push rod 2, increase the pressure of the push rod 2 on the ejector plate, until the pressure reading measured by the corresponding pressure sensor detection end 6 reaches the predetermined pressure value, and stop moving the push rod 2 forward.

[0100] Step 305: Adjust the remaining top rollers 2 sequentially or simultaneously according to the implementation method of step 304, so that the pressure readings measured on each top roller 2 reach the predetermined pressure value, and stop the forward feeding of each remaining top roller 2.

[0101] The implementation schemes in the above embodiments can be further combined or replaced, and the embodiments are merely descriptions of preferred embodiments of the present invention, and are not intended to limit the concept and scope of the present invention. Various changes and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the design concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. An automatic balancing device for a top roller, characterized in that, The device includes, Ejector plate (1) and at least two ejector rods (2), each ejector rod (2) is vertically and movably arranged on the front plate surface of ejector plate (1); Ejector plate is the mold push plate of injection molding machine, used to push the mold to move during demolding; it is set in the forward pushing direction of ejector plate (1), and one surface of ejector plate is the contact surface of the front end of ejector roller (2); The balance adjustment structure (3) is used to adjust the extension length of each top roller (2), the extension length being the vertical distance from the front end of the top roller (2) to the top plate (1); the balance adjustment structure (3) includes a top roller connecting structure (4) and an adjustment drive structure; The top roller connecting structure (4) includes an adjustment part provided at the end of each top roller (2) and mounting holes symmetrically distributed on the ejector plate (1) that correspond one-to-one with each adjustment part; the ejector plate (1) is also provided with a locking structure (7) that corresponds one-to-one with each top roller (2); The sensor is a pressure sensor. Each detection end (6) of the pressure sensor is detachably installed on the corresponding top roller (2) to determine whether the front ends of each top roller (2) are on the same plane. The control steps include, Step 1: Install each detection end (6) of the sensor onto the corresponding top roller and set the predetermined value; Step 2: Control the movement of the ejector plate (1) and push the front end of the ejector roller (2) close to the ejector plate; Step 3: Balance adjustment structure (3) Adjust the extension length of each top roller (2) to increase the pressure of the top roller (2) on the ejector plate to the predetermined value; Step 4: Fix the top rod (2) so that the extension length no longer changes, and end this adjustment.

2. The automatic balancing device for a top roller according to claim 1, characterized in that: The outer ring of the adjusting part is threaded; the inner wall of the mounting hole is threaded corresponding to the thread of the adjusting part. The adjustment drive device (5) includes a motor and a rotor. The motor is connected to the rotor in a transmission connection, and the rotor is mounted on the top roller (2).

3. The automatic balancing device for a top roller according to claim 1, characterized in that: The mounting hole of the top roller (2) passes through the ejector plate (1); the diameter of the adjusting part of the top roller (2) is the same as the inner diameter of the mounting hole of the top roller (2), and the adjusting part extends outward from the rear plate surface of the ejector plate (1); The adjustment drive device (5) is a jack that corresponds one-to-one with each top rod (2), and the movable end of the jack is connected to the adjustment part provided at the end of the top rod (2).

4. A control method for the automatic balancing device for the top roller according to any one of claims 1-3, characterized in that: The control steps include, Step 101: Install the detection end of the pressure sensor on each top roller; Step 102: Set the preset pressure value for the pressure sensor; Step 103: Control the movement of the ejector plate. When any ejector pin contacts the ejector plate and the pressure value measured at the corresponding detection end changes, stop the movement of the ejector plate. Step 104: Activate one of the adjustment drive structures, and through the adjustment drive structure, drive the corresponding top roller connection structure and extend the extension length of the top roller to increase the pressure of the top roller on the ejector plate until the pressure reading measured by the corresponding pressure sensor reaches the predetermined pressure value, and then stop the corresponding adjustment drive structure. Step 105: Perform step 104 sequentially or simultaneously on the remaining top rollers until the pressure readings measured at the corresponding detection ends on each top roller reach the predetermined pressure value. Step 106: Hold each top roller at the predetermined pressure value and fix the position of each top roller; Step 107: Control the ejector plate to return to its original position to end this adjustment.

5. The control method for an automatic balancing device for a top roller according to claim 4, characterized in that: During steps 101 to 103, each top roller is fixed to the ejector plate by the corresponding locking structure; Before step 104 begins and until the end of step 105, the locking structure unlocks the top roller. Step 106 until the adjustment is complete, the position of the top rollers is locked again by the locking structure, so that each top roller and the ejector plate become a whole.

6. An injection molding machine having an automatic top roller balancing device as described in any one of claims 1-3.

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