Mechanical press slide balancing cylinder control system

Abstract

The utility model relates to mechanical press balance cylinder control technical field, especially a kind of mechanical press slider balance cylinder control system. Including: balance cylinder, pilot module, cartridge valve and energy storage module: the energy storage module is connected with the first port of cartridge valve;The second port of pilot module is connected with cartridge valve;The third port of balance cylinder is connected with cartridge valve;The balance cylinder is connected with mechanical press slider;The pilot module is used to control the internal pressure of balance cylinder, to avoid balance cylinder overpressure;The energy storage module is used to control the movement state of balance cylinder.The utility model is through the pilot control oil of cartridge valve to use independent external control mode, compared with the closing time of existing common internal control mode to improve more than 80%, greatly improve the response speed and safety performance of equipment.

Description

Technical Field

[0001] This utility model relates to the field of mechanical press balance cylinder control technology, and in particular to a mechanical press slide balance cylinder control system. Background Technology

[0002] Mechanical presses are widely used as primary processing devices in the automotive, home appliance, and aerospace industries. Currently, the balancing cylinders of the slides in most multi-link mechanical presses are pneumatic balancing cylinders. Generally, the air source pressure is relatively low, which requires the balancing cylinder to be designed with a large diameter to meet the equipment's output requirements. Furthermore, a correspondingly sized air tank is also needed, making the press structure quite large and complex.

[0003] When the equipment experiences an unexpected power outage or an emergency, the slider cannot provide sufficient balancing force and cannot stop quickly, thus compromising the safety of the equipment. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in related technologies. To this end, this invention provides a control system for a slide balance cylinder of a mechanical press, in which the pilot control oil of the cartridge valve adopts an independent external control mode, improving the closing time by more than 80% compared to the commonly used internal control mode, thus greatly improving the response speed and safety performance of the equipment.

[0005] This utility model provides a control system for a slide balance cylinder of a mechanical press, comprising: a balance cylinder, a pilot module, a cartridge valve, and an energy storage module. The energy storage module is connected to the first port of the cartridge valve; The pilot module is connected to the second port of the cartridge valve; The balance cylinder is connected to the third port of the cartridge valve; The balance cylinder is connected to the slide block of the mechanical press; The pilot module is used to provide external control oil, so that the cartridge valve can be closed quickly; The energy storage module is used to control the motion state of the balance cylinder.

[0006] The mechanical press slide balance cylinder control system provided by this utility model also includes a safety valve, which is connected to the third port of the cartridge valve and serves as an overpressure safety protection function.

[0007] According to the present invention, a mechanical press slide balance cylinder control system is provided, wherein the energy storage module includes: an energy storage device and a first pressure sensor; The output end of the accumulator is connected to the first port of the cartridge valve; The first pressure sensor is connected to the output terminal of the accumulator; The accumulator is used to control the motion state of the balance cylinder.

[0008] According to the present invention, a mechanical press slide balance cylinder control system is provided, wherein the pilot module includes: a pilot accumulator, a pilot solenoid valve, and a second pressure sensor. The output terminal of the pilot accumulator is connected to the input terminal of the pilot solenoid valve; The output end of the pilot accumulator is connected to the second port of the cartridge valve; The second pressure sensor is connected to the output terminal of the pilot accumulator; The pilot solenoid valve is used to control whether the pilot accumulator is turned on; The pilot accumulator is used to control the on / off state of the cartridge valve.

[0009] According to the present invention, a mechanical press slider balance cylinder control system includes a cylinder body and a piston rod. When the piston rod is fixed, the slide block of the mechanical press is connected to the cylinder body; When the cylinder body is fixed, the slide block of the mechanical press is connected to the piston rod.

[0010] According to the present invention, a mechanical press slide balance cylinder control system further includes an external control module, wherein the external control module includes a first oil source control combination and a second oil source control combination. The first oil source control unit is connected to the energy storage module; The second oil source control assembly is connected to the pilot module; The external control module is used for manual control of the control system.

[0011] According to the mechanical press slider balance cylinder control system provided by this utility model, it further includes a pressure measuring point module, which includes a first pressure measuring point, a second pressure measuring point and a third pressure measuring point; The first pressure measuring point is connected to the first port of the cartridge valve; The second pressure measuring point is connected to the second port of the cartridge valve; The third pressure measuring point is connected to the third port of the cartridge valve; The pressure testing module is used to assist in testing functions, making it convenient to connect a manual pressure testing device for verification and testing during maintenance.

[0012] The mechanical press slide balance cylinder control system provided by this utility model further includes a third pressure sensor, which is connected to the balance cylinder.

[0013] The above-described one or more technical solutions in the embodiments of this utility model have at least one of the following technical effects: 1. The control system described in this utility model can provide sufficient balancing force to the slider in the event of an unexpected power outage or emergency, enabling the slider to stop quickly. It can replace the complex braking structure in existing mechanical presses, simplifying the equipment structure and configuration and reducing equipment costs. In particular, the pilot control oil of the cartridge valve adopts an independent external control mode, which improves the closing time by more than 80% compared to the commonly used internal control mode, greatly enhancing the equipment's response speed and safety performance.

[0014] 2. The control system has a simple structure, and all components can be standard purchased parts, making maintenance more convenient and cost-effective. It also reduces downtime during maintenance, significantly shortening equipment downtime and improving equipment efficiency.

[0015] 3. By monitoring pressure through sensors and comparing it in real time with the formula parameters, the real-time pressure is combined with the preset pressure in the mold formula. Through PLC program calculation, it can determine whether the accumulator bladder is damaged. Unlike the traditional cumbersome manual inspection method, it can provide very effective guidance for maintenance and inspection. When there is no fault, there is no need to spend time on inspection and maintenance. It provides predictive maintenance reference, improves the intelligent control level of the equipment, and enhances the unmanned control level of the equipment.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0019] Figure label: 1. Accumulator; 2. Pilot accumulator; 3. Pilot solenoid valve; 4. Cartridge valve; 51. First pressure measuring point; 52. Second pressure measuring point; 53. Third pressure measuring point; 61. First pressure sensor; 62. Second pressure sensor; 63. Third pressure sensor; 7. Safety valve; 8. Slider; 9. Balance cylinder; 10. First oil source control assembly; 11. Second oil source control assembly. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. The following embodiments are used to illustrate this utility model, but cannot be used to limit the scope of this utility model.

[0021] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model 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 the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 the embodiments of this utility model based on the specific circumstances.

[0023] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0025] The following is combined Figure 1 This utility model is described.

[0026] Example like Figure 1 As shown, Figure 1 This is a schematic diagram of an embodiment of the present utility model, including: a balance cylinder 9, a pilot module, a cartridge valve 4, and an energy storage module. The energy storage module is connected to the first port of the cartridge valve 4; The pilot module is connected to the second port of the cartridge valve 4; The balance cylinder 9 is connected to the third port of the cartridge valve 4; The balance cylinder 9 is connected to the slide block 8 of the mechanical press; The pilot module is used to provide external control oil, so that the cartridge valve 4 closes quickly; The energy storage module is used to control the movement state of the balance cylinder 9.

[0027] Specifically, the energy storage module includes: an energy storage unit 1 and a first pressure sensor 61; The output end of the accumulator 1 is connected to the first port of the cartridge valve 4; The first pressure sensor 61 is connected to the output terminal of the accumulator 1; The accumulator 1 is used to control the motion state of the balance cylinder 9.

[0028] Specifically, the pilot module includes: a pilot accumulator 2, a pilot solenoid valve 3, and a second pressure sensor 62; The output end of the pilot accumulator 2 is connected to the input end of the pilot solenoid valve 3; The output end of the pilot accumulator 2 is connected to the second port of the cartridge valve 4; The second pressure sensor 62 is connected to the output terminal of the pilot accumulator 2; The pilot solenoid valve 3 is used to control whether the pilot accumulator 2 is turned on; The pilot accumulator 2 is used to control the on / off state of the cartridge valve 4.

[0029] Specifically, this embodiment of the invention also includes a third pressure sensor 63, which is connected to the balance cylinder 9.

[0030] When the slider 8 is working normally, the balance cylinder 9 is fixed on the slider 8 and forms a simple closed system with the accumulator 1. When the slider 8 moves downward, the oil discharged by the balance cylinder 9 is pumped into the accumulator 1. When the slider 8 returns, the accumulator 1 discharges the oil back to the balance cylinder 9. This cycle repeats. At this time, the balance cylinder 9 provides a balancing force to balance the weight of the slider and the upper mold.

[0031] When slider 8 stops normally or briefly, once slider 8 reaches the designated position, the locking cylinder of slider 8 typically drives the locking mechanism to lock slider 8, ensuring that slider 8 is in a safe position after stopping. At this time, the equipment can be shut down by power failure. In case of abnormal power failure or accidental emergency stop by operator, pilot solenoid valve 3 immediately resets due to power failure. At this time, the oil in pilot accumulator 2 enters the control chamber of cartridge valve 4 through the hydraulic circuit. The oil pressure in pilot accumulator 2 is higher than the oil pressure in balance cylinder 9, causing cartridge valve 4 to close quickly, rapidly isolating balance cylinder 9 from accumulator 1. At this time, balance cylinder 9 forms an independent closed volume isolated from other components. Utilizing the incompressible property of liquid, the pressure in balance cylinder 9 rapidly rises to a state that can fully support slider and upper mold, ensuring that slider 8 can stop in a short time and preventing slider 8 from failing to stop in time in emergency situations, thus playing a safety protection role.

[0032] The first pressure sensor 61 and the third pressure sensor 63 can monitor the pressure of the balance cylinder and the accumulator in real time, respectively. At this time, the pressure is theoretically calculated based on the weight of the upper mold and the slider, and oil is added to the accumulator to keep the pressure in the balance cylinder within a normal range. When the pressure exceeds the normal fluctuation range, it means that the balance cylinder system has malfunctioned, and an alarm can be set in time to prompt the operator to repair the equipment and avoid greater safety hazards. In particular, when the accumulator bladder is damaged, ordinary people cannot quickly determine the cause of the fault. However, by using the real-time pressure of the pressure sensor and the preset pressure in the mold formula, the current working status of the accumulator bladder can be quickly determined through the program calculation of PLC or host computer and prompt information can be given. This is conducive to quickly finding out the cause of the fault, shortening maintenance and downtime, improving equipment production efficiency, and improving the level of equipment intelligence.

[0033] Specifically, the control algorithm is as follows: Let the stroke of the hydraulic cylinder at the top dead center position be 0, and the stroke at the bottom dead center position be H. The total volume change of the hydraulic cylinder in each working cycle is V, which is also the working volume of accumulator 1. The volume of accumulator 1 that can meet this working condition is V0. Let the weight of the slider 8, the hydraulic cylinder, and other accessories that the balance cylinder 9 needs to balance be G. Let the weight of the upper mold be M. The balancing force generated by the balance cylinder 9 corresponding to this weight is P2, and the point of generation of the balancing force is approximately at H / 2. Let the pressure of the hydraulic cylinder at stroke 0 be P1, and the pressure at stroke H be P3. The volume change of the hydraulic cylinder during the pressure change from P1 to P2 is V1, and the volume change of the hydraulic cylinder during the pressure change from P2 to P3 is V2. Where V0 is the volume of the accumulator and P0 is the initial charging pressure of the accumulator.

[0034] Because the entire balance cylinder 9 system is closed, it is calculated under adiabatic conditions. Therefore, from the above formula, we can derive: .

[0035] The specific algorithm is to first determine the maximum balance weight G based on the maximum mold weight during actual use; Where D is the diameter of the balance cylinder 9; η is the hydraulic efficiency compensation coefficient (covering hydraulic pipeline pressure loss and cylinder sealing friction), which is generally taken as 0.95.

[0036] Energy accumulator volume selection: Where K is an empirical coefficient, which is generally taken as 10-12; denoted as η, representing the change in cylinder volume; η is the rounding factor, which is selected based on the calculation result of KΔV and combined with the standard accumulator volume, using one or more accumulator combinations for rounding; V0' is an empirically calculated value, which is rounded to obtain V0.

[0037] Adaptive pressure boundary formula: Where α is the boundary coefficient, which is generally taken as 5.5 to 6; and γ is the adiabatic coefficient, which is taken as 1.4.

[0038] In summary, the volume of accumulator 1 can be calculated using the above algorithm. The adaptive pressure boundary formula is pre-set in the PLC control program and associated with the mold parameter formula. During actual use, the upper and lower pressure limits corresponding to the current mold are calculated using the pressure boundary formula and monitored in real time. When the real-time working pressure change of the first pressure sensor 61 exceeds the allowable error of the above pressure boundary range, an alarm is issued, indicating that the volume V0 of accumulator 1 has changed. The urgency level of the maintenance can be determined based on the pressure difference, achieving automated and intelligent detection and maintenance of the volume V0 of accumulator 1. Simultaneously, by monitoring the real-time difference between the first pressure sensor 61 and the third pressure sensor 63, the opening status of cartridge valve 4 can be determined. When cartridge valve 4 is normally open, the difference between the first pressure sensor 61 and the third pressure sensor 63 is the standard valve port pressure difference (obtainable from the component's flow-pressure characteristic curve). Exceeding this standard pressure difference indicates a change in the opening and closing characteristics or oil flow capacity of cartridge valve 4, providing predictive maintenance and improving the intelligent control level of the equipment.

[0039] Specifically, this utility model embodiment also includes a safety valve 7, which is connected to the third port of the cartridge valve 4, and the safety valve 7 serves as an overpressure safety protection.

[0040] Specifically, the present invention also includes an external control module, which includes a first oil source control assembly 10 and a second oil source control assembly 11; The first oil source control assembly 10 is connected to the energy storage module; The second oil source control assembly 11 is connected to the pilot module; The external control module is used for manual control of the control system.

[0041] Specifically, this utility model embodiment also includes a pressure measuring point module, which includes a first pressure measuring point 51, a second pressure measuring point 52 and a third pressure measuring point 53; The first pressure measuring point 51 is connected to the first port of the cartridge valve 4; The second pressure measuring point 52 is connected to the second port of the cartridge valve 4; The third pressure measuring point 53 is connected to the third port of the cartridge valve 4; The pressure testing module is used to assist in testing functions, making it convenient to connect a manual pressure testing device for verification and testing during maintenance.

[0042] Safety valve 7 provides overpressure safety protection for the control system of balance cylinder 9; pressure measuring point is used for auxiliary testing function, which is convenient to connect to a manual pressure measuring device and use a mechanical pressure gauge for verification during maintenance; the second oil source control assembly 11 controls the pressure of accumulator 1 according to the detection data of the second pressure sensor 62; the first oil source control assembly 10 controls the pressure of the control system of balance cylinder 9 according to the actual needs of each mold formula.

[0043] While this disclosure has been described with reference to several specific embodiments, it should be understood that this disclosure is not limited to the specific embodiments disclosed. This disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A control system for a slide balance cylinder of a mechanical press, characterized in that, include: Balance cylinder, pilot module, cartridge valve and energy storage module: The energy storage module is connected to the first port of the cartridge valve; The pilot module is connected to the second port of the cartridge valve; The balance cylinder is connected to the third port of the cartridge valve; The balance cylinder is connected to the slide block of the mechanical press; The pilot module is used to provide external control oil, so that the cartridge valve can be closed quickly; The energy storage module is used to control the motion state of the balance cylinder.

2. The mechanical press slide balance cylinder control system according to claim 1, characterized in that, It also includes a safety valve, which is connected to the third port of the cartridge valve and serves as an overpressure safety protection device.

3. The mechanical press slide balance cylinder control system according to claim 1, characterized in that, The energy storage module includes: an energy storage device and a first pressure sensor; The output end of the accumulator is connected to the first port of the cartridge valve; The first pressure sensor is connected to the output terminal of the accumulator; The accumulator is used to control the motion state of the balance cylinder.

4. The mechanical press slide balance cylinder control system according to claim 1, characterized in that, The pilot module includes: a pilot accumulator, a pilot solenoid valve, and a second pressure sensor; The output terminal of the pilot accumulator is connected to the input terminal of the pilot solenoid valve; The output end of the pilot accumulator is connected to the second port of the cartridge valve; The second pressure sensor is connected to the output terminal of the pilot accumulator; The pilot solenoid valve is used to control whether the pilot accumulator is turned on; The pilot accumulator is used to control the on / off state of the cartridge valve.

5. A mechanical press slide balance cylinder control system according to claim 1, characterized in that, The balance cylinder includes: a cylinder body and a piston rod; When the piston rod is fixed, the slide block of the mechanical press is connected to the cylinder body; When the cylinder body is fixed, the slide block of the mechanical press is connected to the piston rod.

6. The mechanical press slide balance cylinder control system according to claim 1, characterized in that, It also includes an external control module, which includes a first oil source control combination and a second oil source control combination; The first oil source control unit is connected to the energy storage module; The second oil source control assembly is connected to the pilot module; The external control module is used for manual control of the control system.

7. A mechanical press slide balance cylinder control system according to claim 1, characterized in that, It also includes a pressure measurement point module, which includes a first pressure measurement point, a second pressure measurement point, and a third pressure measurement point; The first pressure measuring point is connected to the first port of the cartridge valve; The second pressure measuring point is connected to the second port of the cartridge valve; The third pressure measuring point is connected to the third port of the cartridge valve; The pressure testing module is used to assist in testing functions, making it convenient to connect a manual pressure testing device for verification and testing during maintenance.

8. A mechanical press slide balance cylinder control system according to claim 1, characterized in that, It also includes a third pressure sensor, which is connected to the balance cylinder.

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