A control method for a brake mechanism of a two-platen injection molding machine

Abstract

A control method for a brake mechanism of a two-platen injection molding machine. In order to shorten the brake and gear alignment time of the two-platen injection molding machine, four independent servo oil pump systems are used to independently control four brake and gear alignment cylinders, so that the four gear alignment and brake actions can be executed synchronously. Compared with the traditional control method with only one servo oil pump system, the traditional manual adjustment method is replaced to allow the injection molding machine to automatically find the gear alignment position, which can effectively shorten the gear alignment and brake time, improve the efficiency of the machine, and simplify the user's operation.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, and in particular to a control method for a brake mechanism of a two-platen injection molding machine. Background Art

[0002] The main process of the two-platen injection molding machine is that the movable platen is moved to the set position by the pull of the mold shifting cylinder, and then the brake mechanism is closed to hold the tie rod, and finally the high-pressure cylinder increases the high pressure to the set pressure.

[0003] At present, the gear control in the two-platen brake mechanism usually uses a hydraulic system to provide power to the four gear cylinders and the brake cylinder, including the adjustment of the gear position and the opening and closing of the brake. The confirmation of the gear position usually uses the theoretical value plus manual adjustment. There are two problems in this control method, as follows:

[0004] First, since there is only one hydraulic system to power the four gear alignment cylinders and the brake cylinder, the gear alignment and opening and closing actions take a long time. Second, when the mold is replaced and the mold thickness is automatically adjusted, the theoretical gear alignment position will be calculated, and the four gear alignment cylinders will move to the gear alignment position to close the gate. In this case, if the gear alignment position is not accurately controlled and the gate cannot be closed, it is necessary to manually adjust the gear alignment position to find the position where the gate can be closed before closing the gate. This gear alignment method requires continuous manual adjustment of the gear alignment position until the position where the gate can be closed is found. Not only is debugging difficult, but it also takes a long time.

[0005] On June 29, 2020, Chinese patent document No. CN111976110A disclosed a method for adjusting the brake position of a two-plate injection molding machine, specifically disclosed that the closing position of the gate plate in the brake structure of the two-plate injection molding machine can be adjusted by controlling the movement of the clamping cylinder of the two-plate injection molding machine, thereby realizing the brake position of the brake structure of the two-plate injection molding machine, and also disclosed a two-plate injection molding machine brake position adjustment device and storage medium. Although this method improves the efficiency of brake position adjustment; but the adjustment method is complicated, increases the difficulty of adjustment for operators, and does not necessarily achieve the ideal synchronization effect.

[0006] Therefore, further improvements are necessary. Summary of the invention

[0007] The purpose of the present invention is to provide a control method for a two-plate injection molding machine brake mechanism with high safety and reliability, which can effectively shorten the gear alignment and brake time and improve work efficiency, so as to overcome the shortcomings of the prior art.

[0008] A control method for a brake mechanism of a two-plate injection molding machine designed for this purpose includes a two-plate injection molding machine, which is provided with a mold, a mold shifting cylinder, a brake mechanism and a gear cylinder, wherein the mold includes a movable mold and a fixed mold, wherein the movable mold plate moves toward the fixed mold through the mold shifting cylinder, and is characterized in that: the two-plate injection molding machine is provided with a time detection device, an electronic ruler for detecting the position of the movable mold plate, and a servo oil pump system for synchronously executing and independently controlling the actions of the gear cylinder and the brake mechanism, and the control method is as follows:

[0009] S1. When the movable platen moves toward the fixed platen, the electronic ruler checks the position of the movable platen in real time until the reading of the electronic ruler does not change. The time detection device starts and sets a period of time to remind the operator to observe the reading of the electronic ruler. If the reading of the electronic ruler does not change, it is confirmed that the current mold thickness is the actual thickness of the mold.

[0010] S2, based on the actual mold thickness measured by S1, the system calculates the theoretical gear alignment position of the brake mechanism, and the gear alignment cylinder performs initial gear alignment according to the set parameters;

[0011] S3. When the gear alignment cylinder reaches the theoretical gear alignment position, the brake mechanism engages the brake. If the brake engagement fails, the brake mechanism opens the brake and simultaneously starts the gear alignment position compensation calculation.

[0012] S4, the theoretical gear alignment position minus the set deviation value is used as the forward position movement of the first gear alignment, and the brake mechanism performs gear alignment and braking actions according to the forward position movement. If the braking is unsuccessful, the brake mechanism opens the brake and adds the set deviation value to the theoretical gear alignment position as the backward position movement of the first gear alignment, and the brake mechanism performs gear alignment and braking actions according to the backward position movement. If the braking is unsuccessful, the set deviation value is halved, and the half-deviation value is recorded;

[0013] S5, if the brake is unsuccessful, the theoretical gear alignment position minus the deviation recorded in S4 minus half the value is used as the second gear alignment forward position movement, and the brake mechanism performs gear alignment and brake actions according to the forward position movement. If the brake is unsuccessful, the brake mechanism opens the brake and adds the theoretical gear alignment position to the deviation recorded in S4 minus half the value, and then performs gear alignment and brake actions;

[0014] S6. During S5, if the brake still fails, the deviation of the theoretical gear position is further halved, and the third, fourth, ..., Nth gear alignment and brake actions are performed, and the calculation is repeated until the brake mechanism is successfully braked.

[0015] The control method of the brake mechanism of the two-plate injection molding machine in the above-mentioned embodiment, in order to shorten the time of the brake and gear alignment of the two-plate injection molding machine, will use four independent servo oil pump systems to independently control the four brake and gear alignment cylinders, so that the four gear alignment and brake actions can be executed synchronously. Compared with the traditional control method with only one servo oil pump system, it replaces the traditional manual adjustment method to allow the injection molding machine to automatically find the gear alignment position, which can effectively shorten the gear alignment and brake time, improve the efficiency of the machine, and simplify the user's operation.

[0016] The two-plate injection molding machine is provided with a number of successful brake engagement. During the S3 or S6 process, if the gear alignment position is determined and the brake engagement is successful, the brake opening and brake engagement actions need to be repeated. After the brake engagement reaches the set number of times, it is considered that the automatic gear alignment is completed; if the brake engagement fails, the S6 process is continued.

[0017] The two-plate injection molding machine is provided with a total time parameter for automatic gear alignment. If the brake is not engaged successfully within the set time, the gear alignment and brake engagement actions are stopped, and the set deviation value is manually modified, and the automatic gear alignment process is restarted until the entire automatic gear alignment process is successfully completed.

[0018] The two-platen injection molding machine is provided with separate pressure and flow parameters.

[0019] The compensation calculation is a dichotomy method.

[0020] The number of the brake mechanism and the gear-matching cylinder is at least four, and the number of the servo oil pump system is at least four.

[0021] The control method of the brake mechanism of a two-plate injection molding machine adopted by the present invention, in order to shorten the time of the brake and gear alignment of the two-plate injection molding machine, will use four independent servo oil pump systems to independently control the four brake and gear alignment cylinders, so that the four gear alignment and brake actions can be executed synchronously. Compared with the traditional control method with only one servo oil pump system, the traditional manual adjustment method is replaced to allow the injection molding machine to automatically find the gear alignment position, which can effectively shorten the time of gear alignment and brake, improve the efficiency of the machine, and simplify the user's operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a flow chart of a control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] See also Figure 1As shown, in one embodiment, a control method for a brake mechanism of a two-plate injection molding machine is provided, including a two-plate injection molding machine, the two-plate injection molding machine is provided with a mold, a mold shifting cylinder, a brake mechanism and a gear cylinder, the mold includes a movable mold and a fixed mold, wherein the movable mold plate moves toward the fixed mold through the mold shifting cylinder, the two-plate injection molding machine is provided with a time detection device, an electronic ruler for detecting the position of the movable mold plate, and a servo oil pump system for synchronously executing and independently controlling the actions of the gear cylinder and the brake mechanism, and the control method thereof is:

[0025] S1. When the movable platen moves toward the fixed platen, the electronic ruler checks the position of the movable platen in real time until the reading of the electronic ruler does not change. The time detection device starts and sets a period of time to remind the operator to observe the reading of the electronic ruler. If the reading of the electronic ruler does not change, it is confirmed that the current mold thickness is the actual thickness of the mold.

[0026] S2, based on the actual mold thickness measured by S1, the system calculates the theoretical gear alignment position of the brake mechanism, and the gear alignment cylinder performs initial gear alignment according to the set parameters;

[0027] S3. When the gear alignment cylinder reaches the theoretical gear alignment position, the brake mechanism engages the brake. If the brake engagement fails, the brake mechanism opens the brake and simultaneously starts the gear alignment position compensation calculation.

[0028] S4, the theoretical gear alignment position minus the set deviation value is used as the forward position movement of the first gear alignment, and the brake mechanism performs gear alignment and braking actions according to the forward position movement. If the braking is unsuccessful, the brake mechanism opens the brake and adds the set deviation value to the theoretical gear alignment position as the backward position movement of the first gear alignment, and the brake mechanism performs gear alignment and braking actions according to the backward position movement. If the braking is unsuccessful, the set deviation value is halved, and the half-deviation value is recorded;

[0029] S5, if the brake is unsuccessful, the theoretical gear alignment position minus the deviation recorded in S4 minus half the value is used as the second gear alignment forward position movement, and the brake mechanism performs gear alignment and brake actions according to the forward position movement. If the brake is unsuccessful, the brake mechanism opens the brake and adds the theoretical gear alignment position to the deviation recorded in S4 minus half the value, and then performs gear alignment and brake actions;

[0030] S6. During S5, if the brake still fails, the deviation of the theoretical gear position is further halved, and the third, fourth, ..., Nth gear alignment and brake actions are performed, and the calculation is repeated until the brake mechanism is successfully braked.

[0031] The two-plate injection molding machine is set with the number of successful brake engagement. During the S3 or S6 process, if the gear alignment position is determined and the brake is successfully engaged, the brake opening and brake engagement actions need to be repeated. After the brake engagement reaches the set number of times, it is considered that the automatic gear alignment is completed; if the brake engagement fails, the S6 process will continue.

[0032] The two-plate injection molding machine is equipped with a total time parameter for automatic gear alignment. If the brake is not engaged successfully within the set time, the gear alignment and brake engagement actions are stopped, and the set deviation value is manually modified, and the automatic gear alignment process is restarted until the entire automatic gear alignment process is successfully completed.

[0033] The two-platen injection molding machine has separate pressure and flow parameters.

[0034] Compensation was calculated as a dichotomy.

[0035] There are at least four brake mechanisms and gear-matching cylinders respectively, and at least four servo oil pump systems.

[0036] The traditional gear alignment method is generally: calculate the theoretical gear alignment position through the mold thickness, and then move the four gear alignment cylinders to the gear alignment position to close the switch. If the switch cannot be closed, the gear alignment position needs to be adjusted manually until the switch is closed successfully. This method takes a long time to debug and requires manual operation, which is relatively troublesome. In order to shorten the time of the two-plate injection molding machine's brake and gear alignment, four independent servo oil pump systems will be used to independently control the four brakes and gear alignment cylinders, so that the four gear alignment and brake actions can be executed synchronously. Compared with the traditional control method with only one servo oil pump system, it replaces the traditional manual adjustment method to allow the injection molding machine to automatically find the gear alignment position, which can effectively shorten the time of gear alignment and brake, improve the efficiency of the machine, and simplify the user's operation.

[0037] The above is a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A control method for a brake mechanism of a two-plate injection molding machine, comprising a two-plate injection molding machine, wherein the two-plate injection molding machine is provided with a mold, a mold shifting cylinder, a brake mechanism and a gear-matching cylinder, wherein the mold comprises a movable mold and a fixed mold, wherein: The movable platen is moved toward the fixed platen by the mold-shifting oil cylinder, and the two-platen injection molding machine is characterized in that: a time detection device, an electronic ruler for detecting the position of the movable platen, and a servo oil pump system for synchronously executing and independently controlling the actions of the gear cylinder and the brake mechanism, respectively, are provided on the two-platen injection molding machine, and the control method thereof is as follows: S1. When the movable platen moves toward the fixed platen, the electronic ruler checks the position of the movable platen in real time until the reading of the electronic ruler does not change. The time detection device starts and sets a period of time to remind the operator to observe the reading of the electronic ruler. If the reading of the electronic ruler does not change, it is confirmed that the current mold thickness is the actual thickness of the mold. S2, based on the actual mold thickness measured by S1, the system calculates the theoretical gear alignment position of the brake mechanism, and the gear alignment cylinder performs initial gear alignment according to the set parameters; S3. When the gear alignment cylinder reaches the theoretical gear alignment position, the brake mechanism engages the brake. If the brake engagement fails, the brake mechanism opens the brake and simultaneously starts the gear alignment position compensation calculation. S4, the theoretical gear alignment position minus the set deviation value is used as the forward position movement of the first gear alignment, and the brake mechanism performs gear alignment and braking actions according to the forward position movement. If the braking is unsuccessful, the brake mechanism opens the brake and adds the set deviation value to the theoretical gear alignment position as the backward position movement of the first gear alignment, and the brake mechanism performs gear alignment and braking actions according to the backward position movement. If the braking is unsuccessful, the set deviation value is halved, and the half-deviation value is recorded; S5, if the brake is unsuccessful, the theoretical gear alignment position minus the deviation recorded in S4 minus half the value is used as the second gear alignment forward position movement, and the brake mechanism performs gear alignment and brake actions according to the forward position movement. If the brake is unsuccessful, the brake mechanism opens the brake and adds the theoretical gear alignment position to the deviation recorded in S4 minus half the value, and then performs gear alignment and brake actions; S6. During S5, if the brake still fails, the deviation of the theoretical gear position is further halved, and the third, fourth, ..., Nth gear alignment and brake actions are performed, and the calculation is repeated until the brake mechanism is successfully braked.

2. The control method of the brake mechanism of a two-platen injection molding machine according to claim 1, characterized in that: The two-plate injection molding machine is provided with a number of successful brake engagement. During the S3 or S6 process, if the gear alignment position is determined and the brake engagement is successful, the brake opening and brake engagement actions need to be repeated. After the brake engagement reaches the set number of times, it is considered that the automatic gear alignment is completed; if the brake engagement fails, the S6 process is continued.

3. The control method of the brake mechanism of a two-platen injection molding machine according to claim 2, characterized in that: The two-plate injection molding machine is provided with a total time parameter for automatic gear alignment. If the brake is not engaged successfully within the set time, the gear alignment and brake engagement actions are stopped, and the set deviation value is manually modified, and the automatic gear alignment process is restarted until the entire automatic gear alignment process is successfully completed.

4. The control method of the brake mechanism of a two-platen injection molding machine according to claim 3 is characterized in that: The two-platen injection molding machine is provided with separate pressure and flow parameters.

5. The control method of the brake mechanism of a two-platen injection molding machine according to claim 1, characterized in that: The compensation calculation is a dichotomy method.

6. The control method of the brake mechanism of a two-platen injection molding machine according to claim 1, characterized in that: The number of the brake mechanism and the gear-matching cylinder is at least four, and the number of the servo oil pump system is at least four.

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