CN117703847A - System and method for controlling output pressure of sliding block of mechanical press - Google Patents
System and method for controlling output pressure of sliding block of mechanical press Download PDFInfo
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- CN117703847A CN117703847A CN202311815064.2A CN202311815064A CN117703847A CN 117703847 A CN117703847 A CN 117703847A CN 202311815064 A CN202311815064 A CN 202311815064A CN 117703847 A CN117703847 A CN 117703847A
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- 230000033228 biological regulation Effects 0.000 claims description 7
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- 238000003825 pressing Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 description 5
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- 230000006698 induction Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
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Abstract
The system comprises a hydraulic accumulator, a hydraulic control system and a hydraulic control system, wherein the hydraulic control system is used for adjusting the output pressure of a sliding block and comprises the hydraulic accumulator which is sequentially connected and used for storing pressure oil of an overload protection oil cylinder; the oil source supply equipment is provided with a set valve group and is used for supplementing oil to the system and detecting the pressure of the system; the proportional overflow valve is used for setting the output pressure of the sliding block; the proportional overflow valve is connected with the oil tank. The invention also discloses a control method for the output pressure of the sliding block of the mechanical press, which is characterized in that a set of simple sliding block output pressure control device is added on the basis of an overload protection device of the multi-connecting-rod mechanical press, the sliding block output pressure control device can also arbitrarily adjust the use pressure within a safety range without great cost investment on the basis of keeping the original overload protection function, the sliding block output pressure control device is not only suitable for a new press, but also can reform the old mechanical press with lower cost, so that the old mechanical press has the function of adjusting the sliding block output pressure, and the application range of the mechanical press is further enlarged.
Description
Technical Field
The invention belongs to the technical field of mechanical presses, and particularly relates to a system and a method for controlling output pressure of a sliding block of a mechanical press.
Background
Mechanical presses are used in large numbers as main processing devices in the fields of automobiles, home appliances, aviation and the like. The output force of the sliding block of the existing multi-link mechanical press is changed along with the change of the movement angle of the links, the sliding block is near the lower limit, and the angle between the links is reduced, so that when the sliding block moves near the lower limit, the sliding block is driven by the links to generate infinite output force.
For the safe operation of the equipment, the multi-connecting rod mechanical presses are all provided with overload protection devices, and when the output pressure is greater than the safety pressure set by the system, the safety valve of the overload protection is quickly opened, and the oil is discharged and unloaded. Moreover, for a common multi-link mechanical press, the production is mainly carried out in a fixed-distance mode, and the production is insensitive to working pressure, so long as the pressure is not used in an ultra-safe way. This results in the use of large tonnage presses to compress small dies, which are likely to be crushed if the output pressure is not precisely controlled, resulting in safety hazards and unnecessary economic loss. If the mechanical press is required to have the function of active pressure regulation, the main motor needs to be replaced by a servo motor, and the purchase cost of the servo motor is high for a large press, so that the threshold of the mechanical servo press is high, and the mechanical press is not suitable for purchasing by small and medium enterprises.
The traditional mechanical press is structurally characterized by comprising an asynchronous induction motor 1, a clutch 2, a brake 3, a flywheel 4, a multi-link driving mechanism 5, a link 6 sliding block 7, an overload protection oil cylinder 8 and a frame, wherein the structural principle is shown in fig. 3. The flywheel 4 is driven to rotate in one direction by an asynchronous induction motor, and stores rotational inertial energy. When the press works, the brake 3 is opened by receiving the instruction, the clutch 2 is closed, and the flywheel 4 drives the multi-link driving mechanism 5 and the link 6 to move through the multi-stage gear to drive the slide block 7 to move up and down. When the press is in an overload emergency state, the overload protection oil cylinder 8 is unloaded to ensure the safety of the press.
Therefore, the invention provides a system and a method for controlling the output pressure of the sliding block of the mechanical press, which are simple and feasible, safe and reliable, are suitable for common mechanical presses and are more suitable for reconstruction of old mechanical presses.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a system and a method for controlling the output pressure of a sliding block of a mechanical press. The device has simple structure, safety and reliability, can rapidly reform and upgrade the existing mechanical press, and can meet the realization of pressing small dies by using a large-tonnage press.
The invention is realized in such a way that a mechanical press slide block output pressure control system is characterized in that: the overload protection oil cylinder of the mechanical press is connected with a hydraulic regulation and control system for regulating the output pressure of the sliding block, and the hydraulic regulation and control system comprises a hydraulic accumulator which is connected in sequence and is used for storing partial pressure oil of the overload protection oil cylinder; the oil source supply equipment is provided with a set valve group and is used for supplementing oil to the system and detecting the pressure of the system; the proportional overflow valve is used for setting the output pressure of the sliding block; the proportional overflow valve is connected with the oil tank.
The invention also discloses a mechanical press slide block output pressure control method based on the slide block output pressure control device; when the sliding block is in a normal fixed-distance working mode, the overload protection oil cylinder has an original overload unloading protection function;
when the force of the sliding block is required to be set in a constant pressure mode, a pressure value of the proportional overflow valve is set through a proportional overflow valve set by pressure and an oil source according to the requirement of forming force of a formed workpiece, the pressure value of the proportional overflow valve is used for adjusting the pressure of the oil cylinder, when the force of the connecting rod near the lower limit is larger than the set pressure, oil is pressed into the energy accumulator, the sliding block is kept to work in the set pressure, and after the pressing work is finished, the sliding block rises, and compressed oil returns to the overload protection oil cylinder through the energy accumulator to complete a working cycle.
The invention has the advantages and technical effects that: the invention adds a set of simple slide block output pressure control device on the basis of the overload protection device of the multi-connecting-rod mechanical press, and on the basis of keeping the original overload protection function, the slide block output pressure control device can also arbitrarily set the use pressure within the safety range, so that the transformation does not need great cost investment, is not only suitable for a new press, but also can transform the old mechanical press with lower cost, so that the old mechanical press has the function of adjusting the slide block output pressure, and further expands the application range of the mechanical press. The large mechanical press can bear the production task of small dies, and the utilization rate of client equipment is improved. The system is simple, the maintenance is relatively convenient, the investment cost of clients is truly reduced, the delivery period of manufacturers is shortened, and the equipment with simple and easy structure, safety and reliability is obtained.
Drawings
FIG. 1 is a block diagram of a slider portion of the present invention;
FIG. 2 is a pressure versus stroke curve of the mechanical press of the present invention;
FIG. 3 is a mechanical principle of a conventional mechanical press;
fig. 4 is a pressure stroke curve of a conventional mechanical press.
1. An asynchronous induction motor; 2. a clutch; 3. a brake; 4. a flywheel; 5. a multi-link drive mechanism; 6. a connecting rod; 7. a slide block; 8. overload protection oil cylinder; 9. an oil source supply device; 10. an accumulator; 11. a proportional overflow valve;
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a system for controlling output pressure of a slide block of a mechanical press is provided, wherein a hydraulic regulation and control system for regulating output pressure of the slide block is connected to an overload protection cylinder 8 of the mechanical press, and the hydraulic regulation and control system comprises a hydraulic accumulator 10 which is sequentially connected and is used for storing partial pressure oil of the overload protection cylinder 8; an oil source supply device 9 with a set valve group and pressure detection, which is used for supplementing oil to the system and detecting the pressure of the system; the proportional overflow valve 11 is used for setting the output pressure of the sliding block; the proportional relief valve 11 is connected to the tank.
The invention also discloses a mechanical press slide block output pressure control method based on the slide block output pressure control device, and by adopting the mechanical press slide block output pressure control system, the mechanical pressure can have two working modes, namely an existing fixed-distance working mode and a newly added fixed-pressure mode after optimization; when in actual use, the normal fixed-distance working mode and the fixed-pressure mode are switched according to the actual working requirement;
when the sliding block is in a fixed-distance working mode, the mechanism still plays a role in the original overload unloading protection;
when the fixed pressure mode of the output force of the sliding block needs to be set, the pressure value of the proportional overflow valve 11 is set according to the requirement of the forming force of the formed workpiece through the proportional overflow valve 11 and the oil source 9, the pressure value of the proportional overflow valve 11 is set and used for adjusting the pressure of the oil cylinder 8, when the force of the connecting rod near the lower limit is larger than the set pressure, the oil is pressed into the energy accumulator 10 to keep the sliding block to work in the set pressure, and when the sliding block rises after the pressing work is finished, the compressed oil returns into the overload protection oil cylinder 8 through the energy accumulator 10 to complete a working cycle.
Application examples:
for example, the backplate of a new washing machine requires a forming pressure of 300 tons, but the minimum mechanical press rating in the customer's plant is 1000 tons. If the mold is directly used on line, the traditional mechanical press cannot accurately regulate the pressure, so that the mold of the rear guard plate of the washing machine is easy to be used in overpressure, and even the mold is crushed. This requires the addition of excessive pads or an increase in the pressure safety margin of the mold, which is an ineffective investment for the customer. If the 1000 ton press is equipped with the hydraulic system of the invention, the pressure of the proportional pressure regulating valve can be set to 300 tons. Thus, the customer can accurately output 30% of the pressure, i.e., 300 tons, with little cost. Therefore, the invention realizes the overload protection and the setting control of the output pressure of the mechanical press for the first time.
As can be seen from fig. 4, the maximum working stroke of the mechanical press is 13mm, i.e. starting 13mm above the lower limit of the slide, the slide can reach the nominal force, and as the slide descends, the slide force is larger and larger, and once the angle of the connecting rod is vertical, an infinite force condition occurs.
By adopting the invention, as can be seen from fig. 2, a set of valve-controlled slide block output pressure control device capable of regulating pressure is arranged outside the overload protection oil cylinder, and when the liquid pressure in the overload protection oil cylinder reaches a set value, the excess liquid is stored into the energy accumulator, so that the press not only maintains the original overload protection function, but also can realize the setting of any pressure value less than the nominal pressure, so that the press not only has the high efficiency of a mechanical press, but also has the high-precision pressure control of the hydraulic press.
The transformation does not need great cost investment, is not only suitable for a new press, but also can transform the old mechanical press with smaller cost, so that the old mechanical press has the function of adjustable output pressure of the sliding block, and further the application range of the mechanical press is enlarged. The large mechanical press can bear the production task of small dies, and the utilization rate of client equipment is improved. The system is simple, the maintenance is relatively convenient, the investment cost of clients is truly reduced, the delivery period of manufacturers is shortened, and the equipment with simple and easy structure, safety and reliability is obtained.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (2)
1. A mechanical press slide block output pressure control system is characterized in that: the overload protection oil cylinder of the mechanical press is connected with a hydraulic regulation and control system for regulating the output pressure of the sliding block, and the hydraulic regulation and control system comprises a hydraulic accumulator (10) which is sequentially connected and is used for storing partial pressure oil of the overload protection oil cylinder (8); an oil source supply device (9) with a set valve group for supplementing oil to the system and detecting the pressure of the system; the proportional overflow valve (11) is used for setting the output pressure of the sliding block; the proportional overflow valve (11) is connected with the oil tank.
2. The mechanical press slide block output pressure control method based on the slide block output pressure control device is characterized by comprising the following steps of:
when the sliding block is in a normal fixed-distance working mode, the overload protection oil cylinder has an original overload unloading protection function;
when the fixed pressure mode of the output force of the sliding block is required to be set, the pressure value of the proportional overflow valve (11) is set according to the requirement of the forming force of the formed workpiece through the proportional overflow valve (11) and the oil source (9), the pressure value of the proportional overflow valve (11) is set and used for adjusting the pressure of the oil cylinder (8), when the force of the connecting rod near the lower limit is larger than the set pressure, the oil is pressed into the energy accumulator (10), the sliding block is kept to work in the set pressure, and after the pressing work is finished, the sliding block rises, the compressed oil returns to the overload protection oil cylinder (8) through the energy accumulator (10) to finish a working cycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311815064.2A CN117703847A (en) | 2023-12-26 | 2023-12-26 | System and method for controlling output pressure of sliding block of mechanical press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311815064.2A CN117703847A (en) | 2023-12-26 | 2023-12-26 | System and method for controlling output pressure of sliding block of mechanical press |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117703847A true CN117703847A (en) | 2024-03-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311815064.2A Pending CN117703847A (en) | 2023-12-26 | 2023-12-26 | System and method for controlling output pressure of sliding block of mechanical press |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117703847A (en) |
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2023
- 2023-12-26 CN CN202311815064.2A patent/CN117703847A/en active Pending
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