JP2674920B2 - Hydro-pneumatic high speed cylinder device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydropneumatically actuated high speed cylinder device capable of varying output at any position of a stroke.

[0002]

2. Description of the Related Art A conventional high-speed cylinder device is disclosed, for example, in "Plasticity and Machining", Vol. 1, No. 1 (1960), pp. 51-54, and this high-speed cylinder device is shown in FIG. The low pressure chamber 83 and the high pressure chamber 84 are provided in the cylinder body 81 via the orifice plate 82, and the orifice of the orifice plate 82 is provided on the surface of the piston 86, to which the output rod 85 is connected, on the high pressure chamber 84 side. A ring seal 87 that abuts on the outer peripheral portion of the hole 82a is provided, and a starting nozzle hole 88 that opens outside the abutting portion of the ring seal 87 on the outer periphery of the orifice hole 82a is formed on the orifice plate 82.

In the above structure, when the ring seal 87 is in contact with the orifice plate 82 at the top dead center H position of the piston 86, the pressure P ₁ acting on the piston 86 by the fluid pressure of the low pressure chamber 83 and the pressure of the high pressure chamber 84. The pressure P ₂ acting on the piston 86 via the orifice hole 82a by the fluid pressure
And are in balance. In this state, by supplying the fluid from the starting nozzle hole 88 and slightly moving the piston 86 to the bottom dead center L side, the pressure receiving area of the piston 86 that receives the pressure by the fluid in the high pressure chamber 84 increases at a dash. The 86 could be driven to the bottom dead center L side with high speed and high output.

[0004]

When performing plastic working such as pressing, for example, the section requiring high-speed and high-output processing is limited during the driving stroke of the processing jig, and the entire driving stroke is high-speed and high-output. In addition, if the entire driving stroke is high speed and high output, the capacity of the buffer mechanism must be greatly increased. By the way, the high-speed cylinder device has a structure in which it is not possible to switch to high-speed drive during low-speed drive, or to switch from high-speed drive to low-speed drive before bottom dead center to buffer the impact of the machining jig.
It was difficult to incorporate it into a drive mechanism that requires switching and control between high speed and low speed and high output and low output.

The present invention solves the above-mentioned problems, and the moving speed and output of the output rod can be changed at any position of the stroke, the setting of the changing position can be easily changed, and the whole can be made compact. An object of the present invention is to provide a hydraulic / pneumatic actuated high speed cylinder device that can be used.

[0006]

In order to solve the above problems, a hydropneumatically actuated high speed cylinder device according to the present invention comprises:
An air pressure chamber and a hydraulic chamber defined by a piston slidably arranged in the cylinder casing are provided, and the piston is provided with an output rod projecting toward the air pressure chamber side and a control rod projecting toward the hydraulic chamber side in the relative direction. On the hydraulic chamber side,
A high-pressure oil chamber is provided through a valve plate having a valve hole formed therein, through which a control rod is inserted through a sealing material, and a hydraulic chamber and a high-pressure oil chamber are communicated in the valve hole at a predetermined position of the control rod. A small diameter portion that forms an inflow space is provided, and a hydraulic pressure booster that supplies high pressure oil into the high pressure oil chamber is integrally provided around the cylinder casing.

[0007]

In the above structure, when the piston is driven from the top dead center to the bottom dead center to move the output rod in a protruding manner, the hydraulic pressure booster is operated to send the pressure oil to the high pressure oil chamber,
Pressure oil is supplied to the hydraulic chamber so that a driving force larger than the piston driving force of the pneumatic chamber is obtained. As a result, the piston is moved to the air pressure chamber side, the air in the air pressure chamber is discharged, and the output rod is moved in a protruding manner. Then, when the small diameter part of the control rod approaches the valve hole position, an inflow space is formed between the small diameter part and the valve hole, and the pressure oil in the high pressure oil chamber flows into the hydraulic chamber through this inflow space and the piston Drive the output rod to move at high speed and high output. Further, when the small-diameter portion passes through the valve hole and the inflow space is closed and the supply of pressure oil to the hydraulic chamber is stopped, the moving speed and output of the output rod are reduced, and the piston is stopped at bottom dead center. . For the backward movement from the bottom dead center, the piston can be returned to the top dead center by stopping the hydraulic pressure booster and reducing the hydraulic pressure in the hydraulic chamber from the pneumatic chamber.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hydropneumatically actuated high speed cylinder device according to the present invention will be described below with reference to FIG.

Reference numeral 1 denotes a piston slidably arranged in an inner cylinder casing 2, which defines an air pressure chamber 3 and a hydraulic pressure chamber 4. The piston 1 is provided with an output rod 5 on the pneumatic chamber 3 side and a control rod 6 on the hydraulic chamber 4 side in a relative direction on the cylinder axis. A high pressure oil chamber 8 is formed at an end of the hydraulic chamber 4 in the inner cylinder casing 2 via a valve plate 7, and the control rod 6 is provided with a sealing material in a valve hole 9 formed in the valve plate 7. 1
It is slidably penetrated through 0. A small-diameter portion 11 having a length L is formed at a predetermined position on the control rod 6, and the small-diameter portion 11 allows the hydraulic chamber 4 and the high-pressure oil chamber 8 to be located between the control rod 6 and the valve hole 9.
An inflow space 12 that communicates with and is formed so that the pressure oil in the high pressure oil chamber 8 can be sent to the hydraulic chamber 4.

A guide hole 14 for the output rod 5 and a drive air port 15 for supplying / discharging compressed air into / from the air pressure chamber 3 are formed in the end plate 13 on the air pressure chamber 3 side. A guide hole 17 for the control rod 6 is formed in the end plate 16 on the high-pressure oil chamber 8 side, and the control rod 6 is formed on the outer surface of the guide hole 17.
Is provided, and a position sensor 19 for detecting a distance to the distal end surface of the control rod 6 to detect a movement limit of the piston 1 is attached to an end of the rod cover 18. The detection signal of the position sensor 19 is input to the cylinder control device 22. The end plate 16 is provided with a drive oil port 20 for supplying and discharging drive oil into the hydraulic chamber 4. The drive oil port 20 is connected to the high-pressure oil chamber 8.
And is connected to the hydraulic chamber 4 by an oil pipe 21 penetrating through the valve plate 7.

In the outer cylinder casing 30 fitted onto the inner cylinder casing 2, 8 to 16 hydraulic pressure boosters 31 for supplying pressure oil to the high pressure oil chamber 8 are arranged at regular intervals in the circumferential direction. The hydraulic pressure booster 31 is installed in the pneumatic chamber 3
The high-pressure oil storage chamber 33 is disposed on the high pressure oil chamber 8 side. The pressure intensifier 32
A pressure-intensifying piston 35 is slidably fitted in a pressure-increasing cylinder chamber 34 formed in the cylinder axis direction, and a pressure-increasing passage 36 formed between the pressure-increasing cylinder chamber 34 and the high-pressure oil storage chamber 33. Further, a pressure-intensifying rod 37 connected to a pressure-increasing piston 35 is slidably fitted thereto, and a first check valve 38 is provided to allow inflow only to the high-pressure oil storage chamber 33 side. In the return chamber 34a of the pressure-intensifying cylinder chamber 34, a return spring 39 for retreating the pressure-increasing piston 35 is fitted outside the pressure-increasing rod 37, and in the compression chamber 34b of the pressure-intensifying cylinder chamber 34. A pressure-increasing air port 40 for supplying and discharging operating air for driving the pressure-increasing rod 37 is formed. Further, a second check valve 42 that allows inflow only to the pressure-increasing passage 36 is interposed in the pressure-intensifying oil port 41 that supplies the pressure-intensifying oil to the pressure-increasing passage 36. Therefore, by repeatedly supplying and discharging the operating air to and from the compression chamber 34 b, the pressure-intensifying rod 37 is reciprocated to suction-compress the pressure-intensified oil from the pressure-intensifying oil port 41 and send the compressed oil to the high-pressure oil storage chamber 33. Can be.

A pressure increasing air pipe 51 and a pressure increasing oil pipe 52 are connected to the pressure increasing air port 40 and the pressure increasing oil port 41 of the pressure increasing portion 32, respectively. The pressure-increasing air pipe 51 is connected to a first pneumatic accumulator 56 via an air supply pipe 53, and compressed air is supplied to the first pneumatic accumulator 56 by a compressor 54 via a first pressure reducing valve 55. I have. And the air tube 51 for pressure intensification
An opening / closing valve 57 for starting and stopping the hydraulic pressure intensifier 31 and a first switching valve 58 for reciprocating the pressure increasing piston 35 are interposed in order from the first pneumatic accumulator 56 side. The pressure-intensifying oil pipe 52 is connected to a hydraulic pump 60. Therefore, the cylinder control device 22
The opening / closing valve 57 is opened by the signal of the first switching valve 58.
Is connected to the pressure increasing air pipe 51 and the compressed air of the first pneumatic accumulator 56 is supplied as operating air to the compression chamber 34b of the pressure increasing cylinder chamber 34, and the first switching valve 58 is set to II. By opening the pressure-increasing air pipe 51 on the compression chamber 34b side by setting
The operating air of b is discharged to the outside through the silencer 59, and the pressure-increasing piston 35 and the pressure-increasing rod 37 are retracted by the return spring 39, and then from the pressure-intensifying oil pipe 52 through the second check valve 42. The pressure increasing oil can be sucked into the pressure increasing passage 36.

In the high pressure oil storage chamber 33, a high pressure oil supply hole 61 communicating with the high pressure oil chamber 8 is formed, and a high pressure oil port 63 to which a driving hydraulic pipe 62 is connected is formed. The driving hydraulic pipe 62 is provided with a hydraulic accumulator 64.
To store the pressurized oil in the high-pressure oil storage chamber 33 in the pressurized oil accumulator 64 or, conversely, to the hydraulic accumulator 6.
4 can be supplied to the high-pressure oil storage chamber 33.
That is, the driving hydraulic pipe 62 is provided with the high-pressure oil storage chamber 3.
An I position for communicating the hydraulic fluid with the hydraulic accumulator 64;
A second switching valve 66 that can be switched between a high pressure oil storage chamber 33 and a position II for discharging the pressure oil to the tank is interposed, and a drive between the second switching valve 66 and the high pressure oil storage chamber 33 is provided. The hydraulic pipe 62 is provided with a branch pipe 69 connected to the drive oil port 20 via the second pressure reducing valve 67 and the throttle valve 68.

Therefore, the top dead center H of the position sensor 19
By switching the first switching valve 58 to the I position by the cylinder control device 22 based on the detection signal of the above, the pressure oil of the hydraulic accumulator 64 is supplied to the high-pressure oil storage chamber 33 and the driving oil is supplied to the hydraulic chamber 4. The second switching valve 66 is set to II by the cylinder controller 22 based on the detection signal of the bottom dead center L of the position sensor 19.
By switching to the position, the hydraulic oil in the hydraulic chamber 4, the high-pressure oil chamber 8, and the high-pressure oil storage chamber 33 can be discharged.

A drive air pipe 71 communicating with an air supply pipe 53 is connected to the drive air port 15 of the air pressure chamber 3, and the drive air pipe 71 is allowed to flow into only the air pressure chamber 3 side. A three-way check valve 72 is interposed. A second pneumatic accumulator 7 for accumulating the air pressure of the driving air pipe 71 is provided at the connecting portion between the driving air pipe 71 and the bypass pipe 74.
5 are provided. Reference numeral 76 denotes a safety valve provided in the driving air pipe 71.

The operation of the above configuration will be described. (1) As shown in FIG. 2, when the piston 1 is at the top dead center H and the position sensor 19 detects this through the control rod 6, an open signal is output from the cylinder controller 22 to the on-off valve 57. The working air is supplied to the pressure boosting air pipe 51, the working signal is output to the first switching valve 58, the hydraulic pressure booster 31 is started, and the switching of the first switching valve 58 is repeated to cause the pressure boosting oil pipe 52 to operate. Rod for increasing pressure oil 3
The pressure is increased by 7 and sent to the high pressure oil storage chamber 33.

(2) Further, when a signal is output from the cylinder control device 22 to the second switching valve 66 and switched to the I position, the hydraulic pressure pipe 62 for communication is communicated and the pressure oil of the hydraulic accumulator 64 is changed to high pressure oil. The pressure oil for driving is supplied to the hydraulic chamber 4 via the branch pipe 69 while being supplied to the storage chamber 33 and the high pressure oil chamber 8. Thereby, the pressure P of the hydraulic chamber 4
₂ is projected move the output rod 5 become large piston 1 than the pressure P ₁ of the pressure chamber 3 by moving the bottom dead center L side.

(3) As shown in FIG. 3, when the small diameter portion 11 of the control rod 6 reaches the valve hole 9 of the valve plate 7, the inflow space 12 is formed.
Is formed, high-pressure oil in the high-pressure oil chamber 8 is introduced into the hydraulic chamber 4, and the piston 1 is acted on by this high-pressure oil to output the rod 5
Is projected and moved to the bottom dead center L side at high speed and high output. The movement of the output rod 5 with high speed and high output is continued in a section of L 'corresponding to the length L of the small diameter portion 11.

(4) As shown in FIG. 4, when the small diameter portion 11 of the control rod 6 passes through the valve hole 9 at the front position where the piston 1 reaches the bottom dead center L, the inflow space 12 is closed and the high pressure oil is discharged. The inflow of high-pressure oil from the chamber 8 side to the hydraulic chamber is stopped, and the speed and output of the output rod 5 are reduced.

(5) As shown in FIG. 5, when the piston 1 reaches the bottom dead center L, this is detected by the position sensor 19 via the control rod 6, and based on this detection signal, the cylinder controller 22 opens and closes. A closing signal is output to the valve 57 to stop the supply of operating air to the pressure increasing air pipe 51, and a stop signal is output to the first switching valve 58 to stop the hydraulic pressure booster 31. At the same time, a signal is output from the cylinder control device 22 to the second switching valve 66 to switch to the II position, and the hydraulic oil in the hydraulic chamber 4, the high-pressure oil chamber 8, and the high-pressure oil storage chamber 33 is discharged. As a result, the pressure P ₁ in the pneumatic chamber 3 becomes higher than the pressure P _{2 in the} hydraulic chamber 4, the piston 1 is moved to the top dead center H, and the output rod 5 is restored.

According to the above-described embodiment, in the entire movement stroke S of the output rod 5, only the section L'where the small diameter portion 11 of the control rod 6 corresponds to the valve hole 9 transfers the high pressure oil in the high pressure oil chamber 8 to the hydraulic chamber 4. , The piston 1 can be driven at a high speed and a high output to move the output rod 5 in a protruding manner, so that a high speed and a high output are required at a specific position such as a press machine, a pile driving machine, or a cutting machine. It can be applied to a driving mechanism of a tool or a device, and efficient driving can be performed. Moreover, by simply changing the design of the position of the small diameter portion 11 of the control rod 6,
The output state of the cylinder device can be easily changed, and it can be easily applied to all devices.

Further, since the drive source for obtaining the output to the cylinder device is the hydraulic pressure and the return drive source is the pneumatic pressure, a large driving force can be surely obtained, and compared with the case where the hydraulic pressure is used for both. It is also advantageous in terms of cost. Further, since the hydraulic pressure intensifier 31 is provided in the outer cylinder casing 30 and integrated with the inner cylinder casing 2, a device for separately obtaining high-pressure air for high-output driving is not required, and the whole can be made compact.

[0023]

As described above, according to the hydropneumatically actuated high speed cylinder device of the present invention, the inflow space is formed by passing the small diameter portion of the control rod through the valve hole while the piston is being driven. By supplying the high-pressure oil from the high-pressure oil chamber to the hydraulic chamber via the piston, the piston and the output rod can be driven at high speed and high output at the small diameter portion forming position of the control rod. Therefore, high-speed and high-output driving force can be obtained only in the required section during the entire stroke, and it is extremely effective as a driving device for a driving mechanism that requires high speed and high output only at a predetermined position, such as processing machines such as press machines and work machines. Can be used for. Further, since the hydraulic booster is provided integrally with the cylinder, a drive source for obtaining high output can be created in the same casing, and the overall size can be made compact.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a double-acting high-speed cylinder device according to the present invention.

FIG. 2 is an operation explanatory view of the cylinder device.

FIG. 3 is an operation explanatory view of the cylinder device.

FIG. 4 is an operation explanatory view of the cylinder device.

FIG. 5 is an operation explanatory view of the cylinder device.

FIG. 6 is an explanatory view of the operation of a conventional high speed cylinder.

[Explanation of symbols]

 1 Piston 2 Inner Cylinder Casing 3 Air Pressure Chamber 4 Hydraulic Chamber 5 Output Rod 6 Control Rod 7 Valve Plate 8 High Pressure Oil Chamber 9 Valve Hole 10 Sealing Material 11 Small Diameter 12 Inlet Space 19 Position Sensor 22 Cylinder Controller 30 Outer Cylinder Casing 31 Hydraulic Pressure Pressure booster 32 Pressure booster 33 High pressure air storage 34 Pressure boosting cylinder chamber 36 Pressure boosting passage 37 Pressure boosting rod 51 Pressure boosting air pipe 52 Pressure boosting oil pipe 54 Compressor 58 First switching valve 60 Hydraulic pump 62 Driving hydraulic pipe 64 Hydraulic pressure Accumulator 66 Second switching valve 67 Second pressure reducing valve 69 Branch pipe 71 Driving air pipe

Front page continued (72) Inventor Yoshihito Sakai 5-3 28 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. No. 28 Hitachi Shipbuilding Co., Ltd. (72) Inventor Tetsuro Furukawa 5-3-3 Nishikujo, Konohana-ku, Osaka-shi, Osaka Prefecture No. 28 Hitachi Shipbuilding Co., Ltd. (56) Reference JP-A-60-260709 (JP, A) Kai 61-82011 (JP, A) JP 63-62682 (JP, A) Jitsuko Sho 48-23028 (JP, Y1)

Claims (1)

(57) [Claims] 1. A cylinder casing is provided with an air pressure chamber and a hydraulic chamber defined by a piston slidably arranged, and the piston is provided with an output rod projecting toward the pneumatic chamber side and a control rod projecting toward the hydraulic chamber side. Provided in the relative direction, a high pressure oil chamber is provided at the end of the hydraulic chamber via a valve plate formed with a valve hole through which a control rod is inserted through a sealing material,
At a predetermined position of the control rod, a small diameter portion that forms an inflow space that connects the hydraulic chamber and the high pressure oil chamber is provided in the valve hole,
A hydraulic / pneumatically actuated high-speed cylinder device, characterized in that a hydraulic pressure booster for supplying high-pressure oil into a high-pressure oil chamber is integrally provided around the cylinder casing.