JPS58501833A - lock valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] lock valve Technology Momeno The present invention relates to a zero leakage lock valve (C) and more particularly (C) connected in a parallel flow relationship. The present invention relates to a locking valve that prevents fluid exchange between multiple devices.

Background technology In applications requiring a hydraulic tilting axis υ, a single large hydraulic cylinder is required. Rather, it is preferable to have two or more hydraulic cylinders. (- It has been found that the The cylinder has greater rigidity and more stability than using a single hydraulic cylinder. Provides load carrying capacity. Lifts loads with solid dimensions] - More accurate than Rack C7 For applications such as lift trucks that must be maneuvered and positioned Load-carrying stiffness such as O has been found to be a desirable feature in .

However, there are many (two will be explained below) connected in parallel flow relationships. d is the time when an external force acts on one of the cylinders. Wake up when you wake up. As a result of this action of 11J, the dimension is reduced from the external force foot. The fluid in the roller/cylinder part is connected to the corresponding interconnection in other hydraulic cylinders. is sent within the The response is, of course, the load carried by the cylinder. Performance of the load support device Kari Futotoranoku: 7 rings so as to have an adverse effect on C] It is undesirable because it can cause locking and tilt and twist (C).

Used to prevent exchange between hydraulic nolinders connected to the phase. One technique developed is that just two fluid conduits connect the hydraulic cylinder, pump and tank. The cylinders are connected to each other in a series flow relationship that extends across the cylinders. Is Rukoto. The opposite ends of the hydraulic cylinders are intangibly connected to each other and the pump The fluid supplied to the rod end of the first hydraulic cylinder moves the iron. one of the interconnected hydraulic cylinders from the cylinder head of the second interconnected hydraulic cylinder; A series relationship is formed to allow fluid to be discharged into the end of the stove. Second hydraulic system The fluid delivered to the rod end of the cylinder causes a displacement of the rond and a second cylinder. at the head end of said cylinder to discharge fluid from the head end of said cylinder into a fluid tank. Reduce dimensions. Hydraulic cylinders and their An example of a system to which they relate is U.S. Pat. No. 84,920 and U.S. Special Issue II'l' No. 4,08, published May 25, 1978. It is recorded and cut down in 6,84ro Y. Such systems are JQ, '4'lK 3%, the pump ° pressure (well, 7 hydraulic cylinders working together is the head) Connect the rod ends to the phase rl- (and connect the rod ends to each other (/C) parallel to the U Requires less pressure than when connected in an upstream relationship.

i 978-+ [9J] 19 Fl-i”1B-i no U.S. special i! 4,114 , No. 516 (Engineering, Desired)) to ensure fluid transmission to the cylinder and at the other cylinder end. A directional control valve for regulating fluid flow rate is also described. However, this Directional control valves, such as will not prevent fluid exchange between the two.

The invention relates to solving one or more problems encountered by the prior art. are doing.

Disclosure of invention In one aspect, the invention includes a lock valve that connects a first control port through a first conduit. a first distribution port and a second distribution port connecting each in series flow relationship; (2) a third distribution port each connected in series flow relationship with the second control port. and a fourth dispensing port. The first dispensing port and the second dispensing port are flat. The third distribution port and the fourth distribution port are connected in a parallel flow relationship. These are parallel flow fluid flows between the connected distribution ports. be shut off, and fluid exchange between them be corrected once.

A locking valve typically has a flow associated with a first dispensing port and a second dispensing port. The flow control device includes a t-, c-distribution port that transmits flow in one direction and a second Other than a switch (or other Block the flow in the opposite direction. Other flow regulators may be either all flow regulators or flow transfer models. The flow in the other direction (L+l+If';:,) until it is in the current mode. Even more flowy The joint device allows one-way fluid communication through the second conduit and directs fluid into the first conduit. Blocks flow in other directions except when activated into flow transfer mode by a signal that cut off

The locking valve of the present invention has a distribution port associated with one of the control ports that cooperates with two hydraulic cylinders. Particularly stepped are the joints which are fluidly interconnected with the same working end. of course , the remaining control ports and the associated remaining distribution ports are located at the remaining ends of the hydraulic cylinder, respectively. fluidly connected to the

Brief description of the drawing FIG. 1 is a schematic diagram of a locking valve of the present invention incorporated into a hydraulic system.

Best mode for carrying out the invention The present invention primarily relates to hydraulic cylinders or cylinders that are fluidly connected in a parallel flow relationship. Regarding ensuring fluid separation between any number of fluid motors, such as Ru. Such fluid separation prevents the exchange of fluid between the fluid rams and Take advantage of excluding reciprocal movements between them. In the following description, the present invention is defined as 2(l I! Oil using a cylinder of 0, instep/stem 10 (this is implemented with a small - C).

However, if the invention is extended to cover three or more hydraulic cylinders, It should be understood that and referring now to the detailed drawings, the hydraulic system 1o is a source of pressurized fluid such as a pump 12, a tank 14, a control valve 16, a first hydraulic cylinder 1; 8. Contains a second hydraulic cylinder 19 and a lock valve 20. Pressurized hydraulic fluid , the pump 12 is also supplied to the control valve 16 through the transmission line 22, while the drain Conduit 24 (c) Transmits hydraulic fluid from the control valve 16 to the tank 14. A pair of actuation lines 26 and 28 are a first control port 3o and a first control port 3o between the control valve 16 and the lock valve 2o. Fluid communication is provided through each of the second control ports 32. control port 30 and 32 constitutes a part of the lock valve 2o and is connected to each of the actuation pipes 26 and 28. are combined.

The lock valve 20 further includes a first distribution port 34 and a second distribution port 36, respectively. and these distribution ports are in parallel flow relationship through conduit 38 to first control port 30. connected with. Each of the third distribution port 4o and the fourth distribution port 42 is A second conduit 44 forms part of the lock valve 20 and also passes through the second control port 32. and are fluidly connected in a parallel flow relationship.

The hydraulic cylinder 18 has a first or rod end 18a and a second or head store 1. 8, while the hydraulic cylinder 19 has a third or rod end 19a and a third It has four or head ends 19b. The first cylinder end 18a and the third cylinder The distributor end 19a is connected to a distribution port by a pair of cylinder conduits 46 and 48, respectively. 34 and 36, while the second nol) 7 da end 18b and the fourth Each of the cylinder ends 19b of the other pair of cylinder conduits 50 and 52 They are joined to respective openings 40 and 42.

The locking valve fluid conduits 38 each extend to a dispensing port 34 and 36, respectively. It includes bifurcated sections forming conduits 38a and 38b. Distribution port 34 and 36 includes a first pilot operated non-return check. Each of the valve 54 and the second pilot operated check valve 56 are preferably configured to These check valves are operable in a fluid isolation mode and a fluid transfer mode. back check Valves 54 and 56 are connected to distribution conduits 38a and 38b, respectively. Ru. Pilot actuation system of second conduit 44 and check valves 54 and 56 (shown) A device providing fluid communication between the two (not shown) constitutes a pilot line 58. Lily The valve 60 is operable in a fluid isolation mode and a fluid transfer mode; a first conduit between both pilot operated check valves 54 and 56 and control port 3o; 38, allowing fluid flow only in direction 1 toward control port 3o. Let's read N・°4 verses. The IJ IJ valve 60 is a pilot operated check valve 54 ．． 56 and the relief valve 40 is greater than a predetermined value. This predetermined fluid pressure value is determined by the check valve 54 and and 56 are both in their fluid delivery mode (with sufficient directivity). It is. Preferably, the pressure required to activate the relief valve 60 into its transmission mode is , one check valve (54 or 56) is open and the other check valve (54 or 56) is open. 6) is closed by such predetermined differences only for selected differences that are possible if In such cases, actual manufacturing tolerances and Check valves with different opening pressures than their ideal (same) design opening pressure depending on the 4 and 56 as a result of the pilot opening pressure.

The device for regulating fluid communication through the second conduit 44 preferably includes a third pilot An operated check valve 62 is configured, and the check valve 62 is connected from the control port 32 to the distribution port 40 and and 42 or from the first conduit 38 to the pilot operated check valve 62. Pilot communicated through pilot line 64 to pilot mechanism (not shown) Pressure can operate from closed flow isolation mode to open fluid transfer mode .

1) Bypass reverse arranged in a parallel flow relationship with the IJ-7 valve 60]]-me valve 6 6, the fluid is discharged from the control port 30 due to the pressure difference between the check valves 54 and 56-\. Operable to transmission mode.

Proper actuation of the control valve 16 (either to the left or right of the position shown) is controlled by the 7 field pressure flow. hydraulic nolinders 18 and 19, allowing transmission to the appropriate cylinder ends of the body. Let's take a look at the extended or contracted evening. Control valves are Therefore, it is common to use a spool-type valve or other mechanism that can control and seal the zero flow. reeds, and typically allow small but significant fluid leakage through them . Fluid leakage of any amount will sometimes cause the load to remain in selected conditions for extended periods of time. This is unacceptable in some cases, such as in applications that must be supported by rock Valve 20 preferably utilizes components such as check valves 54, 56, 62 and 66. These valves are generally sealed to zero flow and are controlled by control valves 16, such as brackets. Customarily used in conjunction with valves. Hydraulic system explained so far 1 The actual operation of 0 will be provided in the next section.

Industrial applicability If extension of the hydraulic cylinders or rams 18 and 19 is desired, the control valve 16 is shifted to the left, which causes pressurized fluid to be transferred from fluid transfer line 22 to fluid actuation line 22. 28 and to control port 32. The fluid entering the control port 32 is through the conduit 44 and the valve 10 throat operated reversing valve 62 into its fluid transfer mode. -1 actuation υ, the fluid passing through the pilot-operated reverse IE valve 62 is parallel to fM the lock valve 2o through the distribution ports 40 and 42, where the The fluid is oiled to bias the cylinders 18 and 19 to their extended position. Pressure cylinder end 18. Enter b and 19b. Along the Ryusa Tsumugi explained earlier (2) (fluid pressure), the hydraulic fluid present at cylinder ends 18a and 19a pilot operated check valves 54 and 56 operating in a fluid flow isolation mode; As a result, it increases because it cannot be released. The increasing fluid pressure is , pilot line 5 to the pilot mechanism of pilot operated check valves 54 and 56. 8 and thereby cause pilot operated check valve 54 to block their flow. Activates body transmission mode. The relief valve 6° allows the pressure inside the conduit 38 to flow to the control port 3o. for both check valves 54 and 56 before operatively allowing any fluid flow of Pyro-operate valves 54 and 56 to ensure an open fluid transfer mode. The flow continues until the pressure (by a predetermined difference) is exceeded to allow the cut to open. Remains in body-blocking mode. Such a predetermined pressure difference is Typical of check valves 54 and 56 as a result of releasing pressure tolerances and results therefrom necessary to account for unsynchronized openings. The result of opening the relief valve 60 As a result, the remaining hydraulic flow at the cylinder ends 18a and 0:'19a The body passes through the IJ l)-no valve 6o, passes through the opening 3o, and connects the operating pipe 26. and is continuously transmitted to the fluid tank 14 through the drain line 24.

If it is desired to retract hydraulic cylinders 18 and 19, control valve 16 is moved to the right. shifted, with hydraulic fluid from transmission line 22 passing through actuation line 26 to the control port. 30. The relief valve 60 transmits flow only toward the control port 30. Then, the pressurized fluid opens the bypass check valve 66 and flows in a parallel flow relationship between IJ and IJ. -] Stroke the valve 60. The hydraulic fluid thus transferred is pilot-operated reverse actuate stop valves 54 and 56 to their fluid transfer mode and from there Allowing fluid communication to cylinder ends 18a and 19a. directly explained so far The fluid pressure in the hydraulic circuit is the hydraulic pressure at the cylinder ends 18b and 19b. The fluid encounters the pilot-operated check valve 62 and cannot escape there. , the amount increases. The pressure in fluid line 38 is pumped through pilot line 64. The pressure in the fluid conduit 38 is communicated to the pilot operated check valve 62 so that the pressure in the fluid conduit 38 is predetermined. When the specified minimum pressure is exceeded, the pilot operated check valve 62 is placed in its fluid transfer mode. It operates to. As a result of the opening of pilot operated check valve 62, hydraulic cylinder 18 and 19 contract and fluid exits the cylinder from cylinder ends 18b and 19b. through pilot-operated check valve 62 through pilot-operated check valve 62. Follow line 28 through control &l] valve 16 and through drain line 24 to drain the tap. is released into the tank 14.

Once the desired degree of contraction or expansion of the cylinder has been achieved, Move it to the closed position as shown, and then connect the pump 12 through the transfer tube 22. The supplied fluid is returned to the tank 14 through the drain pipe 24. hydraulic cylinder The position of the cylinders 18 and 19 is then locked by the locking valve 20 and Fluid exchange between cylinders 18 and 19 is prevented. Consider fluid exchange between cylinders. When the cylinder 18 is contracted, the force exerted on the cylinder 18 is first use will be considered. Such transmitted forces are transmitted to cylinder lines 50 and 52. The pressure on the hydraulic cylinder 19 is increased and the hydraulic cylinder 19 is extended. While I was there, When the hydraulic cylinder 19 is extended, fluid must flow out from the cylinder end 19a. Must be. Although the pressure in cylinder line 48 increases, the flow therethrough The body flow is blocked by the pilot-operated reverse eye valve 56 located at the fluid flow J5'lf + 7~D. Cut off. Therefore, cylinder 18t4 resists accommodation ft1 and cylinder 19 resists stretching. Of course, the same result is that the fluid flow from the cylinder end 19b is shut off by a check valve 62, which is machined by the lot, and/from the cylinder end 18a. ML fluid flow is shut off by pilot operated check valve 54 in flow shutoff mode. Therefore, it can be obtained by applying a contraction force to the cylinder 19.

Secondly, extension forces are considered in the cylinder 18. Inside the cylinder base 18a fluid is distributed because the pilot operated check well 54 is in its flow interruption mode. There is no need for transmission through the mouth 34. The same result was obtained at the cylinder end 19a ( The burning fluid is removed by the pilot operated check valve 56 in flow cutoff mode. Since the cylinder 19 cannot flow, the extension force obtained when the cylinder 19 is applied is Ru.

Although several conduits and conduits have been described above, the same is true for the purposes of the present invention. removed or replaced by appropriate passages in the unitary structure for components rather than those where the components are directly connected to each other It should be understood that this is only included to illustrate the actual arrangement of.

Here, the lock valve is connected fluidly in parallel when an unbalanced external force acts on the cylinder. It is clear that this is provided to prevent fluid exchange between the hydraulic cylinders. It will be clear. Thus preventing fluid exchange between the hydraulic cylinders 18 and 19, Maintaining a constant relationship between hydraulic cylinders thereby ensures that they are in a fixed position. Often required to hold supported loads. lift truck prop A lock valve 20 equipped with hydraulic pressure 7 cylinders is used for tilting. In the case of hydraulic pressure 7 cylinders The original load is maintained in a constant tilting state, and the relative one-stroke of the hydraulic tilting cylinder is This prevents any significant displacement and thereby eliminates the resulting binding of the tilting cylinder.

Claims (1)

[Claims] 1. First fluid control port (30) and second @L uncontrolled outlet (32): A first fluid distribution port (34) and a second driftwood distribution port (36): the first control port (30) and the first distribution D (34) and the second fluid distribution port (36). a first fluid transmission conduit (38) providing fluid communication to: a third fluid distribution port (40); ), a fourth fluid distribution port (42), said second control port (32), and said third fluid distribution port (42); a second dispensing port (40) and a fourth dispensing port (42). a fluid transmission conduit (44), and: said first fluid distribution port (34) and said second fluid distribution port. (36) a first device for regulating fluid communication through said first conduit (38) between said first conduit (38); (54,56) operable between fluid transfer mode and fluid cutoff mode. A first device (54, 56) and a second fluid communication regulating device (54, 56) When in said fluid transfer mode, both said first fluid distribution ports (34) and The first conduit ( a second device (60) regulating fluid communication through the first predetermined device (38); in response to a fluid pressure in said second conduit (44) being greater than a minimum pressure; a device (58) for activating a first regulating device into said fluid transfer mode; and a third dispensing device; (40) and the fourth dispensation [Ko.142] and the second dispensation (32) of I1j. a third device (62) regulating fluid communication between said second conduit (44) and said second conduit (44); ) and is operable between a transfer mode and a shutoff mode. a joint device (62) and a second predetermined pressure greater than the second minimum pressure; said third regulating device in said flow transfer mode responsive to fluid pressure in said tube (38); a locking valve comprising: a device (64) for actuating the position (62); 2. In the lock valve (20) f according to claim 1, the first fluid The communication adjustment device (54, 56) connects the first distribution port (34) and the second distribution port. (36) respectively connected to a first pilot-operated check valve (54) and a first pilot-operated check valve (54) and from the first control port (30) at a second pilot-operated check valve (56). by means of fluid pressure directed towards said first distribution port (34) and said second distribution port (36). a first reverse 1E valve (54) operable to the derivative transmission mode; A lock valve characterized in that it includes a check valve (56). 5. In the lock valve (20), the first and the first (20) The check valve operating device (58) connects the second conduit (44) with both the check valves. (characterized by a device (58) providing fluid communication between the cell (54, 56) lock valve. 4. In the lock valve (20) according to claim 2, the second housing communication A regulating device (60) is in fluid communication with said pilot operated check valve (54, 56). and a downstream 1R11 that communicates with the first control port (30) and the driftwood. ) an IJ-F valve (60), wherein the upstream 7) fluid pressure and said first predetermined 7) When the pressure light is selected, the minimum pressure is 1 hour; characterized by comprising a relief valve (60) providing fluid flow between the upstream side and the downstream side. lock valve. 5. In the lock valve (20) according to claim 4, the selected amount ensures the operation of both check valves (54°56) to their fluid transfer mode. A lock valve characterized in that it is large enough to 6. In the lock valve (20) according to claim 4, further: the release The first control port (30) and the pyro ・Upstream and downstream sides in fluid communication with the cut-operated check valves (54, 56), respectively. a bypass check valve (66) having a a bypass check valve (66) for providing fluid flow through said first conduit (38) to said first conduit (38); A lock valve comprising: Z. In the lock valve (20) according to claim 1, the third fluid communication The regulating device (62) connects the second distribution port (32) and the third distribution port (40)b. ・The 10th side in fluid communication with both of the distribution ports (42) of YoU1g4 and The third 71 that squares the second flll? Ironoto operated check valve (62) , the pressure acting on its second side by the pilot pressure and with a predetermined difference The pressure acting on the first side of the dog is activated into the fluid transfer mode. A lock valve characterized in that it includes a third pilot-operated check valve (62) that is . 8. The lock valve (20) according to claim 7, wherein the fluid communication adjustment The actuating device (64) of the device. said pilot transfers pressure from said first fluid conduit (38) to said third pilot; Lock valve characterized in that it comprises a device (64) for providing an operating check valve (6z) . 9. A first fluid having a first end (18a) and a second end (18t) having a ram (18) and a third end (19a) and a fourth end (191)) a second fluid ram; a device (12) for supplying pressurized fluid; and a tank (14): front The first ram end (18a) and the third ram end (19a) are connected to the refrigeration fluid, respectively. a first fluid distribution port (34) and a second fluid distribution port (36) through which said second a fourth ram end in fluid communication with the ram end (18b) and the fourth ram end (19b), respectively; a third fluid distribution port (40) and a fourth fluid distribution port (42); and a first fluid distribution port. With a lock valve (20) having a main port (30) and a second fluid control port (32): front the pressurized fluid supply device (12) and one of the control ports (30, 32 as desired); ) a control valve (16) selectively providing fluid flow between the eccentric ports (30, 32); and the lock valve (20) further connects the first control port (30) to the first control port (30). a first conduit (1c) fluidically connecting to the distribution port (34) and the second distribution port (36); 38), and the second control port (32) is connected to the third distribution port (40) and the fourth distribution port (40). a second conduit (:44) fluidly connected to the distribution port (42) and said first distribution port; (34) and a second dispensing port (36) to adjust the fluid communication between said first ram Preventing fluid transport between the end (18&) and the third ram end (19a), a device (54, 56) operable between a transmitting mode and a blocking mode; a first regulating device (54, 56), and said first predetermined minimum pressure is also increased; said first regulator (54) in response to fluid pressure in said second conduit (44). , 56) into said transmission mode; regulating fluid communication between the joint device (54, 56) and the first control port (30); a second device (60), wherein said first adjustment device (54, 56) is in a transmission mode; a second adjustment device (60) operable to a sharp transmission mode in which the second control is operable; port (32) and both the third distribution port (40) and the fourth distribution port (42). a third device (62) for regulating fluid communication between transmission and isolation modes; a third regulating PE position (62) operable between a second predetermined maximum The fluid pressure (C) in the thick first conduit (38) fc (small pressure) and a device (64) for actuating the third adjustment device (62) into said transmission mode. A fluid system (10) characterized by: 10. The fluid system (10) according to claim 9, further comprising: providing fluid communication between the first control port (30) and the first regulating device (54, 56); a fourth adjusting device (66) operable between transmission mode and shutoff mode; a fourth regulating device that is capable of operating and is independent of the mode of operation of said first regulating device; (66) A fluid system characterized by comprising: (66).