JPH0650304A - Cylinder device - Google Patents

Abstract

PURPOSE:To effectively restrain energy loss in a simply constructed cylinder device. CONSTITUTION:When a piston 16 of a main cylinder 11 interrupts a chamber 20 and supply exhaust path 32, pressure in a chamber is increased as pushed by the piston 16, while fluid exhausted from the chamber 20 having the increased pressure is sent to a sub-cylinder 62 so that a piston 48 is moved with speed control by a flow controlling valve 70 in synchronization with the piston 16. Thus, a special position detector is dispensed with by the simple construction to provide an economical cylinder device so that energy can be effectively utilized by the use of exhausted fluid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder device which operates a sub cylinder by a fluid discharged from a main cylinder.

[0002]

2. Description of the Related Art Generally, in the industrial world, when a piston of a cylinder moves to a predetermined position, a piston of another cylinder may start moving in synchronization with the cylinder. In such a case, in the conventional case, the position of the cylinder piston is detected by the position detector, and when the piston of the cylinder moves to a predetermined position, the switching valve is switched by the signal from the position detector. , A fluid is supplied from another pump to another cylinder to move the piston of the other cylinder.

[0003]

However, such a conventional cylinder device requires a special position detector, a switching valve, complicated piping, and wiring, which complicates the structure and is expensive. There is a problem that becomes. Moreover, since the fluid supplied to another cylinder is normally returned to the tank (when not supplied to the other cylinder), a large energy loss occurs.

It is an object of the present invention to provide a cylinder device which has a simple structure and is inexpensive and which can effectively suppress energy loss.

[0005]

SUMMARY OF THE INVENTION Such an object is to connect a main cylinder having therein a cylinder chamber divided into two chambers by a piston, and two chambers of the main cylinder respectively. A pair of supply / discharge passages for supplying / discharging fluid to / from the piston of the main cylinder, and when the piston moves toward one stroke end and reaches the vicinity of the one stroke end,
A shutoff member that shuts off one chamber from which the fluid is being pushed out and one supply / discharge passage on the low pressure side, and a piston for 2
A sub-cylinder having a cylinder chamber partitioned into two chambers, and one of the chambers of the sub-cylinder and one of the chambers of the main cylinder are always connected to each other, and the main cylinder is shut off by a shut-off member to increase the pressure. A connection passage for guiding the fluid in one chamber to the chamber of the sub-cylinder to move the piston of the sub-cylinder, and a connection passage connecting the middle of the connection passage and the one supply / discharge passage on the low pressure side. This can be achieved by providing an escape passage for releasing the fluid therein to one of the low pressure side supply / discharge passages, and a flow rate control valve provided in the middle of the escape passage for adjusting the amount of the escaped fluid.

[0006]

Now, the high-pressure fluid is supplied from the high pressure side supply / discharge passage, here the other supply / discharge passage, to the chamber of the main cylinder, here the other chamber, and the piston of the main cylinder moves toward one stroke end. Suppose you are moving. At this time, since the low-pressure side supply / discharge passage and the connection passage are connected to the remaining chamber of the main cylinder, here one chamber, the fluid in one chamber flows out through both the supply / discharge passage and the connection passage. However, since the connection passage is connected to the sub-cylinder and the flow control valve and has a large resistance, the fluid in the one chamber is discharged only through one of the supply / discharge passages on the low pressure side and does not flow through the connection passage. Absent. As a result, the piston of the sub-cylinder does not move at this point. When the piston of the main cylinder reaches a predetermined position near one stroke end, the shutoff member shuts off one chamber from one supply / discharge passage, but after this shutoff, the piston moves toward one stroke end. As the fluid in one chamber increases in pressure, it is pushed out by the piston. A predetermined amount of the fluid thus pushed out flows into one of the chambers of the sub-cylinder through the connection passage, and the remaining predetermined amount is released into the one supply / discharge passage through the escape passage and the flow control valve. As a result, the piston of the sub-cylinder starts moving in synchronization with the piston of the main cylinder. At this time, the moving speed of the piston of the sub-cylinder can be determined by adjusting the amount of fluid flowing through the flow control valve to adjust the amount of fluid flowing into the sub-cylinder. In this way, the movement of the piston of the sub-cylinder is performed by the piston of the main cylinder blocking one chamber and one supply / discharge passage and causing the fluid to flow from one chamber to the connection passage. As described above, a special position detector, a switching valve, complicated piping, and wiring are unnecessary, the structure is simple, and the cost of the entire device is low. Moreover, since the fluid supplied to the sub-cylinder is the fluid discharged from the main cylinder, energy can be effectively used.

According to the second aspect of the invention, the main cylinder can control the two sub-cylinders. Further, according to the third aspect, the sub cylinder can be remotely operated by the main cylinder. Further, according to the fourth aspect, the insertion portion provided for cushioning the main cylinder can also have a blocking function, and the structure is simplified. Further, if configured as in claim 5,
The moving position of the piston of the main cylinder can be detected in the sub cylinder. Further, according to the sixth aspect, the correspondence between the moving position of the piston of the main cylinder and the moving position of the piston of the sub cylinder becomes clear, and the control becomes simple.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 11 denotes a main cylinder used for mold clamping of a die casting machine, and the main cylinder 11 has a cylinder case 13 in which a cylinder chamber 12 extending in the axial direction is formed. This cylinder chamber 12
An insertion hole 14 having a diameter smaller than that of the cylinder chamber 12 is provided at one axial end of
However, there is a similar insertion hole on the other axial end of the cylinder chamber 13.
15 are in communication. Reference numeral 16 denotes a piston slidably inserted in the cylinder chamber 12, and the piston 16 has a large-diameter piston portion 17 and a rod portion 18 having the other end fixed to the piston portion 17. ing. The piston portion 17 has an outer diameter slightly smaller than the inner diameter of the cylinder chamber 12, and a U packing 19 for sealing the space with the cylinder chamber 12 is attached to the outer periphery of the piston portion 17. The piston portion 17 allows the cylinder chamber 12 to be divided into a chamber 20 located on one side and a chamber 21 located on the other side.
Divided into two rooms. Further, the central portion of the rod portion 18 penetrates through one end portion of the cylinder case 13, and a space between the rod portion 18 and the cylinder case 13 is sealed by a U packing 22 attached to the cylinder case 13. An insertion portion 23 as a blocking member that contacts the piston portion 17 is formed on the rod portion 18 on one side of the piston portion 17, and the outer diameter of the insertion portion 23 is substantially the same as that of the insertion hole 14. Further, the rod portion 18 on the other side of the piston portion 17 has the piston portion
An insertion portion 24 is formed as another blocking member in contact with 17,
The outer diameter of the insertion portion 24 is almost the same as that of the insertion hole 15.

Reference numeral 27 is a pump for discharging a pressure fluid, 28 is a tank, and these pump 27 and tank 28 are connected to a switching valve 29 through a discharge passage 30 and a discharge passage 31, respectively. The switching valve 29 and the insertion holes 14 and 15 are connected to each other through a pair of supply / discharge passages 32 and 33. As a result, the chambers 20 and 21 of the main cylinder 11 are supplied through the insertion holes 14 and 15, respectively. It means that it is connected to the discharge passages 32 and 33. As a result, the supply / discharge passages 32 and 33 are switched to the high-pressure side and the remaining low-pressure side by switching the switching valve 29, supplying fluid to the chambers 20 and 21, or
Drain fluid from 0 and 21. Further, the insertion holes 14 and 15 and the one end and the other end of the cylinder chamber 12 respectively communicate with the communication passages 34 and 35.
Check valves 36 and 37 that allow only the flow of fluid from the insertion holes 14 and 15 to the cylinder chamber 12 are interposed in the communication passages 34 and 35, respectively. Then, when the piston 16 moves toward one stroke end and moves to the vicinity of the one stroke end, the insertion portion 23 starts to be inserted into the insertion hole 14, so that the space between the supply / discharge passage 32 and the chamber 20 is reduced. When the piston 16 moves toward the other stroke end and moves to the vicinity of the other stroke end, the insertion portion 24 begins to be inserted into the insertion hole 15, so that the supply / discharge passage 33 and the chamber twenty one
Is cut off.

1, 3, 4, and 5, reference numeral 45 designates a cylinder case installed at a position far from the main cylinder 11, for example, on a control panel. Inside the cylinder case 45, a pair of parallel cylinders are provided. Chambers 46 and 47 are formed. Pistons 48 and 49 are slidably inserted into the cylinder chambers 46 and 47, respectively, and these pistons 48 and 49 have large-diameter piston portions 50 and 51 and the other ends of these piston portions 50 and 51. It has fixed rod portions 52 and 53, respectively. The pistons 50 and 51 have outer diameters in the cylinder chambers 46 and 47.
The diameter is slightly smaller than the inner diameter of the cylinder chamber 46,
O-rings 54 and 55 that seal between 47 and 47 are mounted respectively. The piston chambers 50 and 51 divide the cylinder chambers 46 and 47 into two chambers 56 and 57 located on one side and chambers 58 and 59 located on the other side. Further, the central portions of the rod portions 52 and 53 pass through the inside of one end of the cylinder case 45, and locking pieces 60 and 61 in the shape of a truncated cone that widen toward the one end are fixed to the one end. The cylinder case 45 and the piston 48 described above collectively constitute a sub-cylinder 62 that internally has a cylinder chamber 46 divided into two chambers 56 and 58 by the piston 48, and the cylinder case 45 (the sub-cylinder) described above. (Shared with 62), piston
49 as a whole constitutes another sub-cylinder 63 having a cylinder chamber 47 partitioned by a piston 49 into two chambers 57, 59. Further, in this embodiment, the moving speed (distance) of the main cylinder 11 and the sub cylinders 62, 63
In order to equalize the moving speed (distance) of the sub-cylinder 6 with the axial length of the insertion portions 23 and 24.
The stroke lengths of 2 and 63 are the same.

One of the chambers of the sub-cylinder 62, here the rod-side chamber 56 and one chamber of the main cylinder 11, here the rod-side chamber 20, is a connecting passage 66 made of a long pipe.
Is always connected through, and a throttle 64 is provided at one end of the connection passage 66 adjacent to the main cylinder 11. As a result, when the chamber 20 and the supply / discharge passage 32 are shut off by the insertion portion 23 and the fluid flowing out from the chamber 20 to the connection passage 66 is restricted by the throttle 64, the pressure in the chamber 20 rises. However, the fluid in the chamber 20 whose pressure has risen is guided to the chamber 56 of the sub-cylinder 62 through the connection passage 66 and moves the piston 48 of the sub-cylinder 62 toward the head side. Further, one of the chambers of the sub-cylinder 63, here the rod-side chamber 57 and the other chamber of the main cylinder 11, here the head-side chamber 21, is constantly connected through another connecting passage 67 made of a long pipe. A throttle 65 is provided at one end of the connection passage 67 near the main cylinder 11. As a result, when the chamber 21 and the supply / discharge passage 33 are shut off by the insertion portion 24 and the fluid flowing out of the chamber 21 to the connection passage 67 is restricted by the throttle 65, the pressure inside the chamber 21 rises. But this increased pressure chamber
The fluid in 21 flows through the connection passage 67 into the chamber of the sub-cylinder 63.
Guided by 57, the piston 49 of the sub-cylinder 63 is moved toward the head side. The remaining chamber 58 of the sub-cylinder 62
And one of the supply / discharge passages 32 is connected through a long passage 68, and the connection passage 66 and the passage 58 are connected by an escape passage 69, whereby the escape passage 69
Is connected to the supply / discharge passage 32 through the passage 68. As a result, a part of the fluid in the connection passage 66 is released to the one supply / discharge passage 32 through the escape passage 69. A flow control valve 70 for adjusting the amount of fluid to be released and a check valve 71 for allowing only the flow of fluid from the connection passage 66 to the passage 68 are provided in the middle of the escape passage 69. The remaining chamber 59 of the sub-cylinder 63 and the middle of the other supply / discharge passage 33 are connected through a long passage 72. Further, the connecting passage 67 and the passage 72 are connected by another escape passage 73, and this escape passage
The 73 is connected to the supply / discharge passage 33 through the passage 72. As a result, a part of the fluid in the connection passage 67 is released to the other supply / discharge passage 33 through the escape passage 73.
Further, another flow rate control valve 74 for adjusting the amount of the fluid to be released and a check valve 75 for allowing only the flow of the fluid from the connection passage 67 to the passage 72 are provided in the middle of the escape passage 73. Then, as described above, the two sub cylinders 62, 63 can be controlled by the single main cylinder 11.

3, 4 and 5, the sub-cylinder
A case 79 having a cavity 78 inside is fixed in the vicinity of 62 and 63, specifically, on one end surface of the cylinder case 45.
A pair of sliders 80 and 81 are slidably supported on the lower surface of the cavity 78 of 79. And these sliders 80, 81
Can be moved along guide rails 82, 83 extending parallel to the rod portions 52, 53 of the sub-cylinders 62, 63 formed on the lower surface of the cavity 78. Micro switches 84 and 85 are attached to the sliders 80 and 81, respectively, and these micro switches 84 and 85 are turned on when engaged with the locking pieces 60 and 61, respectively, and released from the locking pieces 60 and 61. Turns off. When the micro switches 84 and 85 are turned on, the switching valve 29 is switched to the neutral position and the operation of the main cylinder 11 is stopped. 86 and 87 are sliders 80 and 81
Screw shafts which are screwed in, and these screw shafts 86 and 87 extend parallel to the guide rails 82 and 83. And
One ends of the screw shafts 86 and 87 project from the case 79, and knobs 88 and 89 are fixed to the ends thereof, respectively.

Next, the operation of the embodiment of the present invention will be described. Now, the high-pressure fluid discharged from the pump 27 is supplied to the other supply / discharge passage 33 by the switching valve 29, while the low-pressure return fluid from the one supply / discharge passage 32 is discharged to the tank 28. To do. As a result, at the present time, the other supply / discharge passage 33 is the high-pressure supply / discharge passage, and the one supply / discharge passage 32 is the low-pressure supply / discharge passage. And the other supply / discharge passage
The high pressure fluid supplied to 33 is the other chamber of the main cylinder 11.
It is supplied to 21, and the piston 16 of the main cylinder 11 is pressed by the high-pressure fluid and moves toward one stroke end. At this time, the main cylinder 11
It is considered that the fluid in the chamber 20 is pushed by the piston 16 and flows out through both the low-pressure side supply / discharge passage 32 and the connection passage 66, but the sub-cylinder 62 and the flow control valve 70 are connected to the connection passage 66. Since the resistance is large, it is discharged to the tank 28 only through the supply / discharge passage 32 on the low pressure side, which has the least resistance.
It does not flow through the connecting passage 66. As a result, the piston 48 of the sub-cylinder 62 does not move at this point. At this time, the high pressure fluid is
Since it is also supplied to the chamber 59, the piston 49 of the sub-cylinder 63 has moved to the stroke end on the rod side.

When the piston 16 of the main cylinder 11 reaches a predetermined position near one stroke end,
The insertion portion 23 as a blocking member begins to be inserted into the insertion hole 14. At this time, since the outer diameter of the insertion portion 23 and the inner diameter of the insertion hole 14 are substantially the same, the insertion portion 23 is formed in the chamber 20 and the supply / discharge passage 32.
Cut off between and. Even after this interruption, the piston 16 is pushed by the high-pressure fluid and moves toward one stroke end, so that the fluid in the chamber 20 is pushed by the piston 16 and pushed out to the connection passage 66. Here, the flow of the fluid pushed out to the connection passage 66 is restricted by the throttle 64, so that the moving speed of the piston 16 is decelerated to buffer it, and the internal pressure in the chamber 20 rises.
In this way, since the insertion portion 23 provided for exhibiting the buffer function of the main cylinder 11 also has the blocking function,
The structure of the entire device is simplified. Then, the fluid whose pressure has risen passes through the throttle 64 and the connection passage 66 as described above, and then a predetermined amount flows into the chamber 56 of the sub-cylinder 62, and the remaining predetermined amount escapes through the passage 69 and the flow rate control. Through the valve 70, the passage 68 escapes to the supply / discharge passage 32. As a result, the piston 48 of the sub-cylinder 62 starts moving to the rod side in synchronization with the piston 16 of the main cylinder 11. At this time, if the opening of the flow control valve 70 is adjusted to adjust the amount of fluid flowing through the escape passage 69, the amount of fluid flowing into the chamber 56 of the sub-cylinder 62 can be adjusted. The moving speed of the piston 48 of the cylinder 62 can be determined. In this embodiment, the flow rate control valve 70 is adjusted so that the moving speed of the piston 16 of the main cylinder 11 and the moving speed of the piston 48 of the sub-cylinder 62 are the same. Since the axial length of 23 and the stroke length of the piston 48 of the sub-cylinder 62 are the same length, when the piston 16 of the main cylinder 11 reaches one stroke end, the piston 48 of the sub-cylinder 62 also moves to the head side. Reach the stroke end. As a result, the correspondence relationship (one-to-one relationship) between the moving position of the piston 16 of the main cylinder 11 and the moving position of the piston 48 of the sub-cylinder 62 becomes clear, and the control becomes simple.

Then, the piston 48 of the sub-cylinder 62
When it reaches the stroke end on the head side,
60 engages with the microswitch 84
Turn on 84. As a result, the micro switch 84 is moved to the position of the piston 16 of the main cylinder 11, that is, the piston 16
Has reached one of the stroke ends, and that fact is displayed on a display (not shown), and a signal is sent to the switching valve 29 to switch the switching valve 29 to the neutral position to operate the main cylinder 11. Stop. Here, since the micro switch 84 that indirectly detects the position of the piston 16 of the main cylinder 11 is interrupted by the sub cylinder 62 that is remotely operated by the discharge fluid of the main cylinder 11,
When the micro switch 84 fails and is repaired,
It is not necessary to work near the main cylinder 11 (if the main cylinder 11 operates due to an unexpected situation, the vicinity of the main cylinder 11 becomes extremely dangerous), and as a result,
Safety is improved. Further, the movement of the piston 48 of the sub-cylinder 62 is performed by the insertion portion 23 of the main cylinder 11 blocking the chamber 20 and the supply / discharge passage 32 and causing the fluid from the main cylinder 11 to flow into the connection passage 66. As in the prior art, no special position detector, switching valve, complicated piping, and wiring are required, the structure is simplified, and the cost of the entire device is reduced. Moreover, since the fluid supplied to the sub-cylinder 62 is the fluid discharged from the main cylinder 11, energy can be effectively used.

Next, the switching valve 29 is switched to supply the high-pressure fluid from the pump 27 to one supply / discharge passage 32, and the other supply / discharge passage 32.
When 33 is connected to tank 28, the high pressure fluid is
And moves the piston 16 toward the other stroke end. At this time, the high pressure fluid is transferred to the sub cylinder 62.
Flow into both chambers 56 and 58, but the pressure receiving area of the piston 48 on the chamber 58 side is wider than the pressure receiving area of the piston 48 on the chamber 56 side, so the piston 48 is pressed by the high pressure fluid and moves to the rod side stroke end. Then, it returns to the initial state. After that, the sub-cylinder 63 operates, but its operation is almost the same as that described above, and thus detailed description thereof is omitted.

When the stroke of the main cylinder 11 is adjusted, for example, when the stroke when moving from the head side to the rod side is made shorter than the current stroke by, for example, 10 mm, the screw shaft 86 is rotated by the knob 88 and the slider is moved.
The 80 and the micro switch 84 are integrally moved by 10 mm to one end side (left side in FIG. 4). As a result, when the piston 48 of the sub-cylinder 62 moves 10 mm before the head-side stroke end, the locking piece 60 engages with the micro switch 84, and the operation of the main cylinder 11 stops. Since the piston 16 of the cylinder 11 and the piston 48 of the sub-cylinder 62 have a one-to-one correspondence in position as described above, the piston 16 of the main cylinder 11 also stops 10 mm before the rod-side stroke end. The stroke adjustment in the sub cylinder 63 is also the same as described above. Further, in the case as described above, the stroke can be adjusted without changing the positions of the micro switches 84 and 85 by adjusting the opening degrees of the flow rate control valves 70 and 74.

In the above-described embodiment, the position of the piston 16 of the main cylinder 11 is detected by the sub-cylinders 62 and 63, and the stroke of the main cylinder 11 is adjusted. The cylinder may perform an operation different from that of the main cylinder, for example, moving a fixing pin for fixing the molds that have been clamped to each other, or a completely different operation such as a feeding operation. Further, although the micro switches 84 and 85 are used in the above-mentioned embodiments, proximity switches or the like may be used in the present invention. Further, in the present invention, one of the sub-cylinders 62 and 63 may be omitted and the number of sub-cylinders may be one.

[0019]

As described above, according to the present invention, energy loss can be effectively suppressed while the structure is simple and inexpensive.

[Brief description of drawings]

FIG. 1 is an overall schematic cross-sectional view, part of which is shown by a symbol, showing an embodiment of the present invention.

FIG. 2 is a front sectional view of a main cylinder.

FIG. 3 is a side sectional view in the vicinity of a micro switch.

FIG. 4 is a sectional view taken along the line II of FIG.

5 is a sectional view taken along the line II-II of FIG.

[Explanation of symbols]

 11 ... Main cylinder 12 ... Cylinder chamber 14, 15 ... Insertion hole 16 ... Piston 20, 21 ... Chamber 23, 24 ... Blocking member 32, 33 ... Supply / discharge passage 46, 47 ... Cylinder chamber 48, 49 ... Piston 56, 57, 58, 59 ... Chambers 60, 61 ... Locking pieces 62, 63 ... Sub-cylinders 66, 67 ... Connection passages 69, 73 ... Relief passages 70, 74 ... Flow control valves 84, 85 ... Switches

Claims (6)

[Claims] 1. A main cylinder having a cylinder chamber inside which is divided into two chambers by a piston, and a pair of supply / discharge units which are respectively connected to the two chambers of the main cylinder and which supply / discharge the fluid to / from these two chambers. A passage and a piston of the main cylinder, and when the piston moves toward one stroke end and reaches the vicinity of the one stroke end, one chamber on which the fluid is pushed out and one on the low pressure side A shut-off member for shutting off the supply and discharge passages of the sub-cylinder, a sub-cylinder having therein a cylinder chamber partitioned into two chambers by a piston, and one chamber of the sub-cylinder and one chamber of the main cylinder at all times. connection,
A connection passage for guiding the fluid in one chamber of the main cylinder, which is shut off by the shut-off member and whose pressure has risen, to the chamber of the sub-cylinder and for moving the piston of the sub-cylinder; And a flow passage control valve that is provided in the middle of the relief passage and adjusts the amount of the fluid to be released. And a cylinder device. 2. A piston provided in the main cylinder, wherein when the piston moves toward the other stroke end and reaches the vicinity of the other stroke end,
Another shut-off member for shutting off the other chamber from which the fluid is being pushed out and the other supply / discharge passage on the low pressure side, and another sub-cylinder having therein a cylinder chamber partitioned into two chambers by a piston, One of the chambers of the other sub-cylinder and the other chamber of the main cylinder are always connected to each other, and the fluid in the other chamber of the main cylinder, which has been blocked by another blocking member and whose pressure has increased, Of the other connecting passage for guiding the piston of the sub-cylinder to the other chamber and the middle of the other connecting passage and the other supply / discharge passage on the low pressure side, and the fluid in the other connecting passage is connected. 2. A further release passage for releasing the gas to the other supply / discharge passage on the low pressure side, and another flow rate control valve provided in the middle of the other release passage for adjusting the amount of the released fluid. The cylinder device described. 3. The cylinder device according to claim 1, wherein the connection passage is formed of a long pipe, and the main cylinder and the sub-cylinder are installed far apart from each other. 4. The shut-off member is a cushioning insertion portion provided in a rod portion of a piston, and when the insertion portion is inserted into an insertion hole formed in a cylinder case of the main cylinder, the chamber of the main cylinder is closed. The cylinder device according to claim 1 or 2, wherein the low pressure side supply / discharge passage is shut off. 5. A switch is provided in the vicinity of the sub-cylinder, and a locking piece engageable with the switch is provided on a rod portion of a piston of the sub-cylinder, and the switch is intermittently connected by the locking piece. The cylinder device according to 1 or 2. 6. The method according to claim 1, wherein when the piston of the main cylinder reaches the stroke end, the piston of the sub-cylinder reaches the stroke end by controlling the flow rate of the fluid passing through the flow control valve. 2. The cylinder device according to item 2.