WO2022267214A1

WO2022267214A1 - Implosion type overload protection device and method for machine press

Info

Publication number: WO2022267214A1
Application number: PCT/CN2021/114743
Authority: WO
Inventors: 方迪江; 方田; 赵志全
Original assignee: 浙江斯特隆科技有限公司
Priority date: 2021-06-22
Filing date: 2021-08-26
Publication date: 2022-12-29
Also published as: CN113478897B; CN113478897A; TW202300328A; TWI819366B

Abstract

An implosion type overload protection device for a machine press, comprising a ball head for the machine press; the ball head is cooperatively connected to a ball bowl, and the ball bowl is cooperatively connected to an oil cylinder; a pressure cavity is provided between the ball bowl and the oil cylinder, and is connected to a pressurized oil path and an overload overflow oil path, the pressurized oil path and the overload overflow oil path being two different oil paths; and the pressurized oil path is connected to an overload pump. In the present invention, the pressure cavity is provided between the ball bowl and the oil cylinder, the pressure cavity is connected to the pressurized oil path and the overload overflow oil path, and the pressurized oil path and the overload overflow oil path are two different oil paths. The pressurized oil path and the overload overflow oil path are separately provided, so that the machine press instantly and rapidly stops when overloaded, and reactions are more sensitive and safer relative to conventional pressurized oil paths and pressure relief oil paths that are of the same oil path structure.

Description

An implosion type overload protection device and method for a press

technical field

The invention relates to an overload protection device and method, in particular to an implosion type overload protection device for a press.

Background technique

At present, most of the overload protection devices for mechanical presses on the market are divided into two types, one is a collapse block type safety device, and the other is a hydraulic overload protection device. The overload protection device during the working process of the press is an unloading device when the load exceeds 100%-110% of the rated load during operation. At the same time, when the press is overloaded, the overload protection system can quickly restore the press to the working state. In actual production, it is found that both the crushed block safety device and the hydraulic overload protection device have certain defects. Slight overloading of the collapsed block type fuse will not necessarily break the metal fuse, and the machine tool can work normally without an alarm. With the press machine overloaded for a long time, the fatigue strength of the metal fuse increases, and the metal fuse deforms or even breaks. The theory In practice, you can take out the damaged fuse from the square at the front end of the slider to replace it. In practice, it often happens that the fuse is deformed and stuck in the inner cavity of the slider and cannot be pulled out. It is necessary to disassemble the upper connecting rod and the slider. This will lead to long maintenance time, effort, and affect the efficiency of equipment use. The hydraulic overload protection device used in medium and large mechanical presses often leaks and does not unload according to the nominal pressure during use, and its reliability and stability are poor. The pressurized oil port and the unloaded oil port of the hydraulic overload protection device are the same port, and the response time is long when the overload occurs. In the process from the pressure overload to the stop signal of the press machine, the punch and the mold itself will be affected by the overload action reaction. Stress injury caused by excessive length. How to improve the response speed and use safety performance is the research object of those skilled in the art.

Chinese Invention Patent No. CN201710331032.3 discloses an electromechanical overload protection and stretching device and method for a mechanical press. The technical structure of this device and method is a butterfly spring, which requires a spring buffer when overload occurs. time. How to further improve the reaction speed is also the research object of those skilled in the art.

technical solution

The invention provides a mechanical type implosion type overload protection device for a press which has a simple structure and can stop the press rapidly by instantaneous action in case of overload so as to protect the mould.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is as follows: an implosion type overload protection device for a press, comprising a ball head for a press, the ball head is mated with a ball bowl, and the ball bowl is mated with an oil cylinder ;A pressure chamber is provided between the ball bowl and the oil cylinder, and the pressure chamber is connected with a pressurized oil circuit and an overload overflow oil circuit, which are two different oil circuits; the pressurized oil circuit There is an overloaded pump connected. There is a pressure chamber between the ball bowl and the oil cylinder, that is, a mechanical seal is formed between the ball bowl and the oil cylinder. It has high preload pressure, strong rigidity, and has the function of self-explosion. The autonomous blasting function described here in the present invention is also the function of the overload overflow oil circuit. When the pressure chamber is overloaded, the pressure oil can overflow from the mechanical seal formed between the ball bowl and the oil cylinder to achieve the technical purpose of releasing the load. Of course, while releasing the pressure Because the pressure is transmitted to the limit switch, the press stops immediately, preventing mold damage on the press. This kind of device adopts the mechanical seal type oil pressure overload protection structure, and the pressurization and pressure relief oil circuits are set separately, so that the press stops instantly and rapidly when overloaded. Compared with the traditional pressurization and pressure relief oil circuits, the oil circuit structure is the same The response is more sensitive and safe.

The above-mentioned overload overflow oil passage includes a step surface where the ball bowl and the oil cylinder cooperate with each other, and the ball bowl and the oil cylinder on the upper and lower sides of the step surface are fitted with each other to form a first fitting surface and a second fitting surface. This kind of overload overflow oil circuit uses a stepped surface that cooperates between the ball bowl and the oil cylinder to form a mechanical seal. Only when the pressure in the pressure chamber is greater than the set pressure can the stepped surface between the ball bowl and the oil cylinder be able to cooperate. Separated, thereby achieving the technical purpose of pressure oil flowing out through the second bonding surface, the stepped surface, and the first bonding surface to achieve pressure relief.

The first bonding surface is provided with a first oil groove, and the first oil groove can be arranged horizontally or vertically. On the one hand, it can serve as a flow channel, and on the other hand, it can also be used as a preloading cavity to increase the preloading pressure.

A second oil groove is provided on the second bonding surface, and the second oil groove can be arranged horizontally or vertically. On the one hand, it can serve as a flow channel, and on the other hand, it can also be used as a preloading cavity to increase the preloading pressure.

The pressure chamber is communicated with a slide block oil hole, and the slide block oil hole oil passage is connected with the slide block on the press machine. When the press machine, especially the punch press, the slider returns to the top dead center, the overload pump will automatically replenish the pressure to the pressure chamber to quickly reach the protection pressure set by the corresponding tonnage of the punch press.

The overload overflow oil circuit is connected to the oil tank to achieve the technical purpose of rapid pressure relief, and at the same time, the reciprocating utilization performance of the hydraulic oil can also be realized.

The bottom of the oil cylinder is provided with a threaded oil cylinder nut, and the oil cylinder nut cooperates with the oil cylinder and the ball bowl to form a pressure chamber. This pressure chamber structure improves the convenience of ball bowl installation and maintenance.

An implosion type overload protection method for a press, said method comprising the steps of:

1. Initial pressure establishment: pump the hydraulic oil in the oil tank into the pressure chamber to raise the ball bowl to establish the initial pressure seal;

2. Establishment of protection pressure: the overload pump pressurizes the pressure chamber, and finally reaches the protection pressure set by the corresponding tonnage of the press;

3. When the pressure of the press exceeds the set protection pressure, the overload overflow oil circuit connected to the pressure chamber is automatically opened, and at the same time the overload pressure is transmitted to the limit switch to stop the press, and the overload pump supplies pressure to the pressure chamber to quickly reach the protection pressure .

The hydraulic oil overflowed by overload in the overload overflow oil circuit flows into the oil tank.

The press is equipped with two or more implosion-type overload protection devices for the press. When the pressure of the press exceeds the set protection pressure, the overload pump will replenish the pressure to the pressure chamber to quickly reach the protection pressure. In the case of two or more implosion-type overload protection devices on the same press, the implosion-type overload protection devices will independently unload the protection when the pressure is overloaded, and the instantaneous start will restore the high pressure to ensure that the slider is parallel to the worktable. You can safely use precision molds to avoid mold damage.

In the present invention, a pressure chamber is arranged between the ball bowl and the oil cylinder, and the pressure chamber is connected with a pressurized oil passage and an overload overflow oil passage, which are two different oil passages. The pressurization and overload overflow oil passages are set separately, so that the press stops instantly and rapidly when overloaded. Compared with the traditional pressurization and pressure relief oil passages with the same oil passage structure, the reaction is more sensitive and safe.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is a schematic structural diagram of the front view of an implosion type overload protection device for a press of the present invention;

Fig. 2 is a side view structural schematic diagram of an implosion type overload protection device for a press of the present invention;

Fig. 3 is an enlarged view of A in Fig. 1 .

Embodiments of the present invention

The technical solution of this patent will be further described in detail below in conjunction with specific embodiments.

Please refer to Fig. 1-3, an implosion type overload protection device for a press, as a specific embodiment, the implosion type overload protection device for a press of the present invention includes a ball head 1 for a press machine, a ball head 1 A ball bowl 9 is matched and connected, and the ball head 1 is connected to the connecting rod to play the role of transmitting the pressure on the press. This structure is a conventional technical means adopted on ordinary presses, and the present invention mainly provides a mechanical rapid pressure balance device with self-explosion capability.

The key technology is as follows: the ball bowl 9 is connected with the oil cylinder 2, the pressure chamber 3 is arranged between the ball bowl 9 and the oil cylinder 2, the pressure chamber 3 is connected with a pressurized oil circuit and an overload overflow oil circuit, and the pressurized oil circuit and the overload overflow oil circuit There are two different oil circuits, and the existing overload protection system of other manufacturers has one port for the inlet and outlet of high-pressure hydraulic oil, so the oil cylinder cannot be blasted alone to cause damage to the press and mold due to eccentric load. The present invention provides a specific mechanical structure here to realize self-explosion performance: the overload overflow oil circuit includes a step surface 7 that cooperates between the ball bowl 9 and the oil cylinder 2, and the ball bowls on the upper and lower sides of the step surface 7 and the oil cylinder fit together to form the first A fitting surface 12 and a second fitting surface 13 . This kind of overload overflow oil circuit adopts a stepped surface between the ball bowl 9 and the oil cylinder 2 to form a mechanical seal. Only when the pressure in the pressure chamber is greater than the set pressure can the ball bowl 9 and the oil cylinder 2 be mutually sealed. The mated step surfaces 7 are separated, so that the pressure oil flows out through the second fitting surface 13, the step surface 7, and the first fitting surface 12 to achieve the technical purpose of pressure relief, that is, self-explosion performance. The overload overflow oil circuit is connected to the oil tank 10, so as to achieve the technical purpose of rapid pressure relief, and also realize the reciprocating utilization performance of the hydraulic oil.

As a further technical structure, the pressurized oil circuit is connected with an overload pump. The pressure chamber is communicated with a slide block oil hole 11, and the oil passage of the slide block oil hole 11 is connected with the slide block on the press machine. When the press machine, especially the punch press, the slider returns to the top dead center, the overload pump will automatically replenish the pressure to the pressure chamber to quickly reach the protection pressure set by the corresponding tonnage of the punch press. The overload pump with this structure has two functions, one is to pressurize the pressure chamber, and the other is to quickly restore the pressure of the pressure chamber when it is overloaded.

As a structure, the first fitting surface 12 is preferably provided with a first oil groove 8, and the first oil groove 8 can be arranged horizontally or vertically. On the one hand, it can achieve the function of a flow channel, and on the other hand, it can also be used as a pre-compression cavity to improve the pre-pressure. Pressure.

As a structure, the second fitting surface 13 is preferably provided with a second oil groove 6. The second oil groove 6 can be arranged horizontally or vertically. Pressure.

For the convenience of installation, the bottom of the oil cylinder 2 is provided with a threaded oil cylinder nut 5, and the oil cylinder nut 5 cooperates with the oil cylinder 2 and the ball bowl 9 to form the pressure chamber 3 together.

An implosion type overload protection method for a press, comprising the steps of:

1. Initial pressure establishment: pump the hydraulic oil in the oil tank 10 into the pressure chamber to raise the ball bowl 9 to establish an initial pressure seal;

2. Establishment of protection pressure: the overload pump pressurizes the pressure chamber 3, and finally reaches the protection pressure set by the corresponding tonnage of the press;

The above method has the technical performances of simple method, rapid overload stop and rapid recovery. Combined with the specific implementation method, it can be seen that the overload overflow oil circuit connected to the pressure chamber is automatically opened when the pressure is overloaded. In fact, the step surface between the ball bowl and the oil cylinder is separated by pressure, and the pressure relief process takes a very short time. Similarly, during the pressurization process after overload, the overload pump supplies pressure to the pressure chamber to quickly reach the protection pressure.

As a further technical structure, the press is equipped with two or more implosion-type overload protection devices for the press. When the pressure of the press exceeds the set protection pressure, the overload pump supplies pressure to the pressure chamber to quickly reach the protection pressure. . In the case of two or more implosion-type overload protection devices on the same press, the implosion-type overload protection devices will independently unload the protection when the pressure is overloaded, and the instantaneous start will restore the high pressure to ensure that the slider is parallel to the worktable. You can safely use precision molds to avoid mold damage.

The preferred implementation of this patent has been described in detail above, but this patent is not limited to the above-mentioned implementation, and within the knowledge of those of ordinary skill in the art, it can also be made without departing from the purpose of this patent. Variations.

Claims

An implosion type overload protection device for a press, comprising a ball head (1) used for a press, the ball head (1) is mated with a ball bowl (9), characterized in that: the ball bowl (9) An oil cylinder (2) is mated and connected; a pressure chamber (3) is provided between the ball bowl (9) and the oil cylinder (2), and the pressure chamber (3) is connected with a pressurized oil circuit and an overload overflow oil circuit, and the pressurized oil circuit and The overload overflow oil circuit is two different oil circuits; the pressurized oil circuit is connected with an overload pump.
An implosion type overload protection device for a press according to claim 1: said overload overflow oil passage includes a stepped surface (7) that cooperates between the ball bowl (9) and the oil cylinder (2) ), the ball bowl (9) on the upper and lower sides of the step surface (7) and the oil cylinder (2) fit together to form a first fitting surface (12) and a second fitting surface (13).
The implosion type overload protection device for a press according to claim 2: a first oil groove (8) is provided on the first bonding surface (12).
The implosion type overload protection device for a press according to claim 2: a second oil groove (6) is provided on the second bonding surface (13).
An implosion type overload protection device for a press according to claim 1: said pressure chamber (3) is connected with a slider oil hole (11), and the oil passage of the slider oil hole (11) is connected to the slider.
The implosion type overload protection device for a press according to claim 1: the overload overflow oil passage is connected to the oil tank (10).
An implosion type overload protection device for a press according to claim 1: the bottom of the oil cylinder (2) is provided with a threaded cylinder nut (5), and the oil cylinder nut (5) cooperates with the oil cylinder (2) and the ball The bowls (9) together form the pressure chamber (3).
An implosion type overload protection method for a press, said method comprising the steps of:

1. Initial pressure establishment: pump the hydraulic oil in the oil tank (10) into the pressure chamber (3), raise the ball bowl (9) and establish an initial pressure seal;

2. Establishment of protection pressure: the overload pump pressurizes the pressure chamber (3), and finally reaches the protection pressure set by the corresponding tonnage of the press;

3. When the pressure of the press exceeds the set protection pressure, the overload overflow oil circuit connected to the pressure chamber (3) is automatically opened, and at the same time the overload pressure is transmitted to the limit switch to stop the press, and the overload pump supplies pressure to the pressure chamber ( 3) Quickly reach the protective pressure.
An implosion type overload protection method for a press according to claim 8: said

The hydraulic oil overflowed by overload in the overload overflow oil circuit flows into the oil tank (10).
An implosion type overload protection method for a press according to claim 8: said press is provided with two or more implosion type overload protection devices for a press, when the pressure of the press exceeds the set When the protection pressure is fixed, the overload pump supplies pressure to the pressure chamber (3) to quickly reach the protection pressure.