JPH0529112Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is used for dispensing powder and granular materials in storage containers, transport pipes, transport equipment, processing equipment, etc. (hereinafter referred to as storage containers, etc.) for powder and granular materials. This relates to a pneumatically operated impact cylinder used for dropping.

[Prior art] When powder or granules adhere to the walls of a storage container for powder or granules, troubles such as the inability to supply the powder or granules occur, so it is necessary to apply an impact to the walls using an impact cylinder or the like. It is necessary to brush off the adhering powder and granules.

Such an impact cylinder for blowing off powder and granules operated by pressurized air is already known (see, for example, Japanese Utility Model Publication No. 56-34638). In this case, in order to obtain the desired impact force in the impact cylinder, it is necessary to drive the piston impulsively, i.e. the piston is held by a retaining means until the air pressure rises to a predetermined pressure, and the piston is kept in place until the air pressure is sufficient. When it rises, it is necessary to release the hold and rapidly drive the piston.

Conventionally, as a holding means for the piston, for example, a mechanical means for locking a locking member such as a spring-biased ball to a reduced diameter portion attached to the piston,
Electromagnetic means are known in which a magnet is attached to a cylinder and its attraction force is utilized.

However, in all of these known piston holding means, the holding force cannot be easily set, and a troublesome work such as repeated experimental trials and the like to design the holding means is required.

[Problems to be solved by the invention] The present invention sets the retaining force of the piston in the impact cylinder for blowing off adhered powder by attaching a valve spring facing the pressure fluid on the supply side acting on the valve body. By using force, the setting of the holding force of the piston in the impact cylinder is simplified, and it is also possible to easily set the holding force of the piston in the impact cylinder.
The problem to be solved is to further simplify the configuration compared to 71017).

[Means for Solving the Problems] The present invention provides an impact cylinder for removing adhered powder particles that generates an impact force by colliding a rapidly driven piston with an impact member by supplying pressurized air to a pressure chamber. A tank is provided between the pressure chamber and a supply/discharge port for supplying and discharging pressurized air thereto, and the piston is provided with a through hole for passing the pressure chamber through the breathing chamber on the opposite side, and the piston is provided with a through hole that allows the pressure chamber to pass through the breathing chamber on the opposite side. A valve element is provided that comes into contact with and separates from the valve seat on the edge of the chamber side opening and the valve seat on the edge of the pressure chamber side opening in the communication hole between the tank and the pressure chamber, and the valve element is connected to the valve seat on the edge of the pressure chamber side opening in the communication hole between the tank and the pressure chamber. A valve spring is provided that biases a valve seat in the hole, and the valve spring is opened after the air pressure acting on the valve body from the tank side reaches a pressure sufficient to impulsively drive the piston. The above problem is solved by setting the biasing force to a certain degree.

[Function] When pressurized air is supplied to the tank from the supply/discharge port, if the pressure inside the tank is low at the beginning of the supply of pressurized air, the biasing force of the valve spring causes the valve body to close the valve seat between it and the tank. However, when the air pressure in the tank rises enough and the acting force from the air pressure becomes greater than the biasing force of the valve spring, the valve body resists the biasing force of the valve spring and closes the hole between it and the tank. Since it is opened, high-pressure air whose pressure has risen sufficiently flows into the pressure chamber all at once.
Therefore, the piston is rapidly driven by the large acting force of the high-pressure air against the biasing force of the return spring, and collides with the impact member to generate an impact force.

When the air in the pressure chamber is discharged through the supply/discharge port, the piston returns to its original position due to the biasing force of the return spring, and as the piston returns, the valve body closes the valve seat between the tank and the pressure chamber and the breathing chamber. communicate. Therefore, the pressure chamber is opened to the atmosphere.

The holding force of the piston in the impact cylinder is set so that the biasing force of the valve spring is opposed to the biasing force of pressurized air that acts on the valve body from the tank side, and when the biasing force of the pressurized air exceeds a certain value. It is only necessary to set the valve body so that it sometimes opens; that is, the biasing force of the valve spring can be easily calculated based on the air pressure acting on the valve body, so the setting of the holding force of the piston is facilitated.

[Embodiment] FIG. 1 shows an embodiment of the present invention, in which a cylinder body 1 is composed of a cylinder tube 2 and covers 3 and 4 fitted to both ends of the cylinder tube 2.
4 are bolts 5,... inserted through those tightening holes.
It is fixed to the cylinder tube 2 by... and nuts 6,...

Inside the cylinder body 1 is a cylinder tube 2.
It is divided into a pressure chamber 8 and a breathing chamber 9 by a piston 7 that slides inside.The piston 7 is provided with a through hole 11 that communicates both chambers 8 and 9, and a valve is installed on the pressure chamber 8 side. A reduced diameter portion 7a is provided on the breathing chamber 9 side of the piston 7, which forms the chamber 12.

A valve guide 13 is screwed onto the mouth of the valve chamber 12, and the valve body 14 sliding inside the valve guide 13 is
It is biased by a valve spring 15 contracted within the valve chamber 12 and engaged with the shoulder of the valve guide 13 to prevent it from escaping from the valve chamber 12.

The valve body 14 includes a valve chamber 12 in the through hole 11.
A sealing member 18 is provided which abuts a valve seat 17 formed on the opening edge of the cylinder tube 2, and a valve seat body 19 is attached to the end of the cylinder tube 2 on the pressure chamber 8 side by the cover 3. A valve seat 21 is formed on the opening edge of the pressure chamber 8 side of the through hole 20 opened at the center of the valve seat body 19, and a sealing member that abuts the valve seat 21 is provided on the outer surface of the valve body 14. 22 are provided. The seat diameter of the valve seat 17 is
It is formed slightly larger than the seat diameter of the valve seat 21.

The cover 3 on the pressure chamber side has a tank 24 inside it.
is provided, and this tank 24 is connected to the valve seat body 19.
The cover 3 is provided with a supply/discharge port 25 for supplying and discharging pressurized air to and from the tank 24 .

Therefore, the seal member 22 in the valve body 14
The opening area of the valve seat 21 that comes into contact with the opening area of the valve seat 21, that is, the through hole 2 of the valve body 14 when the valve seat 21 is closed by the sealing member 22.
The area of action of the pressure air acting on the zero side is set to be sufficiently smaller than the area of pressure action of the piston 7. Further, the valve spring 15 is activated after the air pressure acting on the valve body 14 from the through hole 20 side reaches a pressure sufficient to impact the piston 7.
The biasing force is set to the extent that 4 is released.

On the other hand, the cover 4 has a through hole 27 whose diameter is enlarged on the breathing chamber 9 side, and a return spring 29 is compressed between the flange portion 28a of the impact member 28 loosely inserted into the through hole 27 and the piston 7. has been done. It goes without saying that the biasing force of the return spring 29 is greater than the biasing force of the valve spring 15.

In the cylinder body 1, the cover 4 is attached to the outer wall surface of a storage container or the like via a striking plate (not shown), so that the tip of the impact member 28 is on the same plane as the outer end surface of the cover 4 as shown in the figure. can be,
In this state, a gap 30 is formed between the flange portion 28a and the enlarged diameter step portion of the through hole 27.

In FIG. 1, reference numerals 31, . . . are exhaust holes provided in the breathing chamber 9.

Next, the operation of the above embodiment will be explained.

FIG. 1 shows a state in which the supply/discharge port 25 is connected to the atmosphere by a switching valve (not shown).
The piston 7 is brought into contact with the valve seat body 19 on the cover 3 side by the biasing force of the return spring 29 , and the valve body 14 closes the valve seat 21 by the biasing force of the valve spring 15 .
Since the valve seat 17 is opened by the biasing force of the valve spring 15 , the pressure chamber 8 is open to the atmosphere through the through hole 11 , the breathing chamber 9 and the exhaust hole 31 .

When the switching valve is switched to supply pressurized air to the supply/discharge port 25, the pressurized air flows into the tank 24 and is accumulated therein. At the beginning of the supply of pressurized air, while the pressure inside the tank 24 is low, the valve body 14 keeps the valve seat 21 closed by the biasing force of the valve spring 15. When the air pressure rises sufficiently and the force of the pressurized air acting on the valve body 14 becomes greater than the biasing force of the valve spring 15, the valve body 1
4 opens the valve seat 21 against the biasing force of the valve spring 15 and simultaneously closes the valve seat 17. Therefore, the high-pressure air in the tank 24 flows into the pressure chamber 8 all at once, and the air pressure suddenly acts on the piston 7, which has a sufficiently larger pressure area than the valve body 14.
The piston 7 is rapidly driven against the biasing force of the return spring 29 and collides with the impact member 28 to generate an impact force, thereby blowing off the powder particles adhering to the wall surface of the storage container or the like. In this case, since the gap 30 is formed between the enlarged diameter step part of the through hole 27 and the flange part 28a of the impact member 28, the impact force of the impact member 28 is not directly transmitted to the cylinder body 1, and the cylinder body due to the impact 1 damage is prevented.

As the piston 7 strokes due to the pressurized air in the tank 24, there is a pressure drop due to the expansion of the pressure air, but by forming the seat diameter of the valve seat 17 to be larger than the seat diameter of the valve seat 21, even during the stroke, the pressure decreases. It is possible to prevent the valve seat 17 from opening. The difference between the seat diameter of the valve seat 17 and the seat diameter of the valve seat 21 is determined by the degree of pressure drop due to the expansion of the pressurized air.

When the switching valve is switched to communicate the supply/discharge port 25 with the atmosphere, the piston 7 returns to its original position due to the biasing force of the return spring 29, and when the valve body 14 opens the valve seat 17 due to the biasing force of the valve spring 15. Since the valve seat 21 is closed at the same time, the air in the pressure chamber 8 flows through the through hole 11 and into the breathing chamber 9.
and is exhausted to the atmosphere through the exhaust hole 31.

It is necessary to hold the piston 7 until the piston 7 is driven after pressurized air is supplied to the tank 24, but the piston 7 must be held until the pressure in the tank 24 increases to a certain extent. Kaha,
Since the biasing force of the valve spring 15 is made to oppose the biasing force of the pressurized air in the tank 24 acting on the valve body 14, the biasing force of the valve spring 15 is determined.
The biasing force of the valve spring 15 can be easily calculated from the pressure within the tank 24 at the time of opening the valve body 14 and the pressure acting area on the valve body 14. Settings for storage are made easier.

[Effects of the invention] In this invention, the piston in a pneumatically operated impact cylinder is held by pressing the valve body provided on the piston against the valve seat with a valve spring, so it is difficult to maintain the piston for how long. The settings are made easier.

Moreover, in the present invention, the pressurized air supplied to the pressure chamber of the cylinder body is stored in a tank and then flowed into the pressure chamber all at once, so the piston is rapidly driven and a large impact force is generated. Moreover, since the supply and discharge of pressurized air to and from the pressure chamber is performed by a single valve body, the overall structure is very simple.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of an embodiment of the present invention. 1... Cylinder body, 7... Piston, 8...
Pressure chamber, 9...breathing chamber, 11, 20...through hole, 1
4... Valve body, 15... Valve spring, 17, 21... Valve seat, 24... Tank, 25... Supply/discharge port, 28...
Impact member, 29...Return spring.

Claims (1)

[Claim for Utility Model Registration] A piston sliding inside the cylinder body is rapidly driven by supplying pressurized air to a pressure chamber defined by the piston, and the piston collides with an impact member to generate an impact force. In the impact cylinder for removing adhered powder particles, a tank is provided between the pressure chamber and a supply/discharge port for supplying and discharging pressurized air to and from the pressure chamber, and the piston has a tank connected to the pressure chamber on the opposite side. A through hole communicating with the chamber is provided, and a valve body is provided that comes into contact with and separates from the valve seat on the pressure chamber side opening edge of the through hole and the valve seat on the pressure chamber side opening edge of the passage hole between the tank and the pressure chamber. A valve spring is provided which biases the valve element against a valve seat in a passage hole between the pressure chamber and the tank, and air pressure acting on the valve element from the tank side drives the piston with an impact on the valve spring. 1. An impact cylinder for removing adhered powder and granular material, characterized in that the biasing force is set to such an extent that a valve body is opened after reaching a sufficient pressure to remove adhered particles.