JPH10279290A - Locking device of jack device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a locking device which prevents the shrinkage of a jack device simply and inexpensively and set and release the setting of the locking device simply in a short time. SOLUTION: This device is constituted in such a manner that a groove 16 is formed on an outer peripheral face of a cylinder tube 11 of a jack device Y, a locking pin 6 which fits in the groove 16 from its outside in such a manner that it can be engaged and disengaged freely is provided, a slider 7 which can loosely fit along an outer face of the cylinder tube 11 and is connected with a piston rod 13 side is fitted in outer periphery of the cylinder tube 11 in play, and the slider 7 is matched with the locking pin 6 by sticking out a part of the locking pin 6 from an inner peripheral face of the slider 7 to the outside in a condition in which the locking pin 6 is fitted in the groove 16. Consequently, machining cost of the locking device is reduced, the cylinder tube can be utilized effectively, and the operation at the time of use can be done simply in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jack device for supporting a heavy object, and more particularly, to a locking device for preventing the jack device from being reduced while supporting the heavy object with the jack device. It is about.

[0002]

2. Description of the Related Art A jack device using a hydraulic cylinder can lift a heavy object by supplying hydraulic oil to an extension-side oil chamber of the hydraulic cylinder. By the way, in the state where a heavy object is supported by the jack device using the hydraulic cylinder for a long time, a load is constantly applied to the jack device on the reduction side. However, the hydraulic oil sometimes escapes to the tank side, in which case there is a disadvantage that the supported heavy object falls or inclines (when supported by a plurality of jack devices).

[0003] When a super-large structure such as an oil tank is lifted, it is necessary to support the periphery of the structure with a plurality of jack devices and lock all the jack devices so as not to be reduced. There is. When such a super-large structure is to be lifted to a predetermined height, it is necessary to raise the structure while keeping it in a horizontal position, and to extend each jack device simultaneously by the same amount (small stroke). .

Conventionally, a jack device as shown in FIG. 10 may be used to raise and lower a super-large structure in a horizontal posture. In FIG. 10, (A) to (E)
Indicates a state change of the jack device. This FIG.
In the jack device shown in FIG. 5, a long bolt 62 is erected on the center of a base 61, and a lower base 63 and a bracket 64 are loosely fitted on the outer periphery of the bolt 62 so as to be able to move up and down. Also, hydraulic cylinders (two) 65, 65 having a predetermined small stroke (for example, a stroke of about 150 mm) are attached to the bracket 64, and the lower base 63 and the bracket 64 are connected to each other by extending and contracting the hydraulic cylinders 65, 65. Can be moved toward or away from each other by a constant stroke. Further, a lower nut 66 that supports the lower base 63 from the lower surface side and an upper nut 67 that supports the bracket 64 from the lower surface side are screwed to the bolt 62, respectively. In FIG. 10, reference numeral 68 denotes a sleeper serving as a mounting table.

The jack device shown in FIG. 10 is operated as follows. First, as shown in FIG. 10A, the upper and lower nuts 66 and 67 are lowered, and
3 and the bracket 64 are supported at the lower movement position. At this time, each of the hydraulic cylinders 65 is reduced. Then, from the state of (A), the hydraulic cylinders 65, 65 are extended to the full stroke as shown in (B), and the bracket 64 is moved up by the stroke → the upper nut 67 is moved as shown in (C). Screw up until it comes into contact with the lower surface of the bracket 64 → As shown in (D), the hydraulic cylinder 65,
65 is reduced and the lower base 63 is moved up until it comes into contact with the lower surface of the upper nut 67 → The lower nut 66 is screwed up until it comes into contact with the lower surface of the lower base 63 as shown in FIG. This (E)
(A) in the position where the bracket 64 is raised by the height of one stroke of the hydraulic cylinder 65 in the state of (A).
Has returned to the state. And after that, (B) ~
The bracket 64 can be raised to a predetermined height with respect to the bolt 62 by performing the required number of operations in (E) as one step.

In order to levitate a super-large structure using the jack device shown in FIG. 10, a plurality of jack devices are used to arrange them around the super-large structure, and each bracket 64 is connected to the side of the structure. It is connected and fixed and installed. Then, each jack device is simultaneously and sequentially turned on in FIG.
By performing the operation as shown in (E), the super-large structure can be raised by one stroke while maintaining the horizontal posture, and similarly, the operations of (B) to (E) can be repeated as many times as necessary to obtain the super-large structure. The objects can be raised in sequence to the desired height by so-called "measuring insect movement". Also, in this conventional jack device, the load of the structure is
And is supported by an upper nut 67 through the hydraulic cylinder 6
The upper nut 67 can support the load of the structure even when the extension function of the 5, 65 is released. When the elevated superstructure is lowered, the operations (B) to (E) are performed in reverse order on each jack device to reduce each jack device.

[0007]

However, the conventional jack device shown in FIG. 10 has the following problems.

(1) When a structure raised to a predetermined height is supported, the structure can be supported by an upper nut 67 screwed to a bolt 62, but is used for this kind of super-large structure. In such a case, it is necessary to use a bolt having a large diameter (high rigidity) and a long length as the bolt 62 serving as a support. Therefore, a great deal of cost is required for threading the bolt 62, and the cost of the entire jack device is increased.

(2) In the case where the bolt 62 is used for the support column of the jack device, when the bracket 64 is supported at the high head position or when the bracket 64 is lowered from the high head position to the surface of the ground, the upper and lower nuts 66 and 67 are sequentially turned, respectively. The screw rotation operation must be performed for each long dimension, and the screw rotation operation is complicated and requires a long time.

In view of the above-mentioned conventional problems, the present invention makes it possible to easily and inexpensively manufacture a locking device for preventing a jack device from shrinking after a heavy object is levitated by the jack device. Another object of the present invention is to enable the setting and releasing operations of the locking device to be performed easily and in a short time.

[0011]

The present invention has the following structure as means for solving the above-mentioned problems.

The invention of claim 1 of the present application is directed to a locking device for preventing the jack device from shrinking. The jack device used in claim 1 of the present invention includes a cylinder tube. On the other hand, a hydraulic cylinder with a structure in which the piston rod moves up and down is used. Further, this jack device may be constituted by only one hydraulic cylinder, but may be constituted by a long stroke first hydraulic cylinder and a short stroke second hydraulic cylinder as in the embodiment of the present application.

The locking device according to the first aspect of the present invention includes a locking pin that forms a concave groove on the outer peripheral surface of the cylinder tube and is removably fitted into the concave groove from the outside thereof and held at the position there. ing. The concave groove may be formed annularly or partially (arc-shaped) on the outer surface of the cylinder tube. Further, the concave groove can be formed in an appropriate shape such as a semicircular or square cross section. Further, the concave groove may be formed at least at one place on the outer peripheral surface of the cylinder tube, but may be formed at two places near the upper and lower ends of the outer surface of the cylinder tube or at many places with a predetermined small height interval. When only one concave groove is formed,
The concave groove is formed at an appropriate position near the top side of the cylinder tube. When a large number of grooves are formed in one cylinder tube, it is appropriate to set the interval between the vertically adjacent grooves to a small interval of, for example, about 40 to 60 mm. Note that the interval can be set appropriately according to the application.

As the locking pin, a pin having a shape which can be removably fitted into the concave groove is employed. For example, if the concave groove is annular, a pair of semi-circular rings in which an annular ring is divided into two can be used as the locking pins. It is preferable that the locking pin be held in position while fitted into the concave groove. Further, when the locking pin is fitted in the concave groove, a part of the locking pin projects outward from the outer surface of the cylinder tube.

In this locking device, a slider that can slide in the longitudinal direction along the outer surface of the cylinder tube is loosely fitted on the outer periphery of the cylinder tube.
This slider is connected to the piston rod side. Therefore, when the jack device expands and contracts, the slider slides on the outer surface of the cylinder tube in its length direction. Also, the inner diameter of the distal end portion (the end opposite to the piston rod connecting portion) of this slider is set to be very slightly larger than the outer diameter of the cylinder tube. There is almost no gap between the tube and the outer peripheral surface. Then, in a state where the locking pin is fitted in the concave groove, a part of the locking pin protrudes outside the inner peripheral surface of the slider, and the tip end surface of the slider can abut the protruding portion of the locking pin. It has become.

The locking device according to the first aspect of the present invention is used as follows. This jack device can be used with its cylinder tube in any of the downward and upward postures. First, when the cylinder tube is used in a downward position, the slider (or piston rod) is connected to a heavy object in a state where the jack device is reduced, and then the jack device is extended by a predetermined length so that the base end side of the cylinder tube is closed. The grounding completes the set. On the other hand,
When the cylinder tube is used in the upright position, the tail side of the cylinder tube is connected to a heavy object while the jack device is also reduced, and then the jack device is extended by a predetermined length so that the distal end of the piston rod (or slider). When the is grounded, the setting is completed. When a super-large structure is lifted, a plurality of jack devices are arranged around the structure. Next, when the jack device (hydraulic cylinder) is extended from the set state,
When the cylinder tube is in the downward position, the slider moves up along the cylinder tube.On the other hand, when the cylinder tube is in the upward position, the cylinder tube moves up with respect to the slider to levitate the respective structures. Can be. Then, after lifting the structure to the desired height, the extension operation of the jack device is stopped. The extension length of the jack device is set so that the groove is exposed at a position immediately near the slider tip (the end opposite to the piston rod connection side) when the number of grooves formed is small. Further, when a large number of the concave grooves are formed at predetermined small intervals, even if the jack device is extended by an arbitrary intermediate length,
Any one of the concave grooves is exposed at a position immediately near the tip of the slider. In this state, the operating oil in the jack device is still contained. Next, after the locking pin is fitted from the outside into the concave groove exposed in the immediate vicinity of the slider tip, when the supporting force of the jack device is released, the tip surface of the slider abuts the locking pin. The load of a heavy object can be supported by the locking pin portion.

According to a second aspect of the present invention, in the locking device of the first aspect, the slider is screwed to the reference side screw member connected to the piston rod side and the reference side screw member. Adjustment-side screw member. The adjustment-side screw member can be moved up and down by being screwed with respect to the reference-side screw member. Further, the distal end surface of the adjustment-side screw member can directly or indirectly abut on a locking pin fitted into the concave groove of the cylinder tube via another member.

In the locking device of the second aspect, as described in the method of use of the first aspect, the structure is lifted to a desired height by the jack device (while the hydraulic oil in the jack device is kept closed). When the adjustment-side screw member is screwed to the extension side with respect to the reference-side screw member in a state in which the locking pin is fitted in the concave groove at the position closest to the slider tip, the reference-side screw member is rotated by the adjustment-side screw member. And the locking pin can be stretched. Therefore, in the locking device of the second aspect, the load of the heavy object can be supported by the locking pin while the structure is lifted to the desired height (without reducing the jack device).

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A jack device and a locking device according to an embodiment of the present invention will be described below with reference to FIGS. In the following description, a heavy object, an object to be processed, and a structure (or a very large structure) are synonyms.

The jack device Y shown in FIGS.
The hydraulic cylinder 1 and the second hydraulic cylinder 2 are connected in the longitudinal direction. As shown in FIGS. 4 to 6, the locking device according to the embodiment of the present invention is arranged on the outer circumference of the cylinder tube 11 of the first hydraulic cylinder 1 in the length direction (vertical direction).
And a plurality of grooves 16 formed on the outer peripheral surface of the cylinder tube 11 as described later.
16 and locking pins 6, 6 fitted into the concave grooves 16.

The first hydraulic cylinder 1 has a long stroke (for example, a stroke of about 1500 to 1600 mm) depending on the application. The second hydraulic cylinder 2 has a predetermined small stroke (for example, a stroke of about 50 to 60 mm). In the jack device Y of this embodiment, the first hydraulic cylinder 1
The cylinder tube 21 of the second hydraulic cylinder 2 is connected and fixed to the tip of the piston rod 13.

In this embodiment, the slider 7 is provided as shown in FIG.
6, a long cylindrical body 71, a reference side screw member 72 fixed to the lower end of the cylindrical body 71, and an adjustment side screw member 73 screwed to the reference side screw member 72. , And a ring body 74 located below the adjustment-side screw member 73.

The cylindrical body 71 has a considerable length (for example,
m). The upper portion of the cylinder 71 is connected to the cylinder tube 21 of the second hydraulic cylinder 2 by a shaft 79. Therefore, the cylinder 71 moves up and down together with the cylinder tube 21 of the second hydraulic cylinder 2. The lower side of the cylinder 71 is the first hydraulic cylinder 1
Cover the outer periphery of the cylinder tube 11. In the fully contracted state of the first hydraulic cylinder 1, FIG.
As shown in the figure, when the cylinder 71 covers almost the entire length of the cylinder tube 11, while the first hydraulic cylinder 1 extends,
As shown in FIG. 3, the lower side of the cylinder tube 11 is exposed to the outside by a length corresponding to the amount of extension.
The cylindrical body 71 has two mounting seats 81 and 82 at upper and lower positions.
Are mounted in a horizontal orientation. Each of the mounting seats 81 and 82 is fixed to a side surface of the processing object (heavy object) 10 to connect the slider 7 to the processing object 10.

The reference side screw member 72 is fixed to the lower end of the cylindrical body 71 by bolting (or welding). The reference side screw member 72 is formed with a male screw, and the adjustment side screw member 73 is formed with a female screw that is screwed to the male screw. On the outer surface of the adjustment-side screw member 73, handles 76, 76 protrude outward at respective opposing positions. The adjustment side screw member 73 is connected to each of the handles 76 and 7.
The reference side screw member 7 is gripped and rotated by screwing.
2 can be moved up or down. In another embodiment, the reference side screw member 7 is used.
2, a female screw may be formed on the adjustment-side screw member 73.

The ring member 74 is formed separately from the adjusting screw member 73. The inner diameter of the ring body 74 is formed to be slightly larger than the outer diameter of the cylinder tube 11, and the facing portion 77 between the outer surface of the cylinder tube 11 and the inner surface of the ring body 74 extends over the entire circumference. They are almost in sliding contact with each other. And this ring body 74
As shown in FIG. 4, when the cylinder tube 11 is used downward, each of the locking pins 6, 6 fitted in the concave groove 16 is locked from above.

When the adjustment-side screw member 73 is rotated in the extension side (downward movement side) in the state shown in FIG. 4, the lower surface of the adjustment-side screw member 73 contacts the upper surface of the ring body 74.
The contact surface 78 (the lower surface of the adjustment-side screw member and the upper surface of the ring body) is a gentle arc surface whose center side is higher. The reason why the contact surface 78 is an arc surface is as follows. That is, the portion of the slider 7 above the adjustment-side screw member 73 is the first hydraulic cylinder 1
There is a slight annular gap with respect to the outer peripheral surface of the cylinder tube 11, and the cylinder 71 may be slightly inclined with respect to the cylinder tube 11. As described above, when the cylinder 71 is inclined with respect to the cylinder tube 11, the adjustment-side screw member 73 is eccentric with respect to the cylinder tube 11 (the lower surface of the adjustment-side screw member is inclined). There is a possibility that the upper surface of the ring body 74 may come into contact with the upper surface of the ring body 74. Can make circumferential contact.

The ring member 74 is supported by ring receivers 75, 75 provided at the outer periphery 4 of the adjusting screw member 73 so as not to fall off. The ring body 74 is installed in a vertically free state by a slight height (for example, about 10 to 15 mm) between the lower surface of the adjustment-side screw member 73 and the lower-end laterally bent piece of the ring receiver 75.

On the outer peripheral surface of the first hydraulic cylinder 1, a large number of grooves 16, 16,... Are formed at predetermined small height intervals (for example, at intervals of 40 to 60 mm). In this embodiment, each concave groove 16 has a groove having a semicircular vertical cross section formed in an annular shape over the entire circumference of the tube. Thus, forming the concave groove 16 on the outer peripheral surface of the cylinder tube 11 can be performed by relatively simple processing. Note that the concave groove 16 may be a square groove, or may be formed in an arc shape (an angle range smaller than 360 °) in the circumferential direction of the cylinder tube 11.

As the locking pins 6 and 6, two arc pins having a circular cross section having a diameter equivalent to the groove width of the concave groove 16 and having a substantially half circumference are employed. These locking pins 6,
6 is a cylinder tube 1 as shown in FIGS.
1 can be fitted into the concave groove 16 formed on the outer peripheral surface so as to be freely detachable from the horizontal facing direction. 4 and 5, when the locking pins 6 and 6 are fitted in the concave grooves 16, the inner half thickness of the diameter of the locking pin is inward of the outer surface of the cylinder tube 11 as shown in FIG. While
The outer half thickness protrudes outward from the outer surface of the cylinder tube 11. In addition, each locking pin 6,
Numerals 6 are retained as they are when they are fitted into the respective grooves 16.

FIG. 7 is a schematic sectional view of a first hydraulic cylinder 1 and a second hydraulic cylinder 2 constituting the jack device Y shown in FIGS. 1 to 3 and a hydraulic circuit thereof, and FIG. An operation process diagram of the device Y is shown, and FIG. 9 is a flowchart showing an operation sequence of the jack device Y. 7 and 8, illustration of the concave groove 16 on the outer peripheral surface of the cylinder tube 11, the slider 7, and the like is omitted.

As shown in FIG. 7, the first hydraulic cylinder 1
The piston 12 divides the inside of the long cylinder tube 11 into two upper and lower oil chambers (an extension-side oil chamber 14 and a reduction-side oil chamber 15). On the other hand, the second hydraulic cylinder 2 also partitions the inside of the short cylinder tube 21 into two oil chambers (an extension-side oil chamber 24 and a reduction-side oil chamber 25) by a piston 22. In this embodiment, the cylinder tube 21 of the second hydraulic cylinder 2 is fixed to the tip of the piston rod 13 on the first hydraulic cylinder 1 side by welding or the like, and the two hydraulic cylinders 1 and 2 are connected in a line. doing. The connection between the first hydraulic cylinder 1 and the second hydraulic cylinder 2 is not limited to the illustrated form (the connection between the piston rod 13 of the first hydraulic cylinder 1 and the cylinder tube 21 of the second hydraulic cylinder 2). Appropriate form such as connection of the cylinder tube 11 of one hydraulic cylinder 1 and the piston rod 23 of the second hydraulic cylinder 2 or connection of the cylinder tubes 11 and 21 of both hydraulic cylinders 1 and 2 or between the piston rods 13 and 23 Can be adopted. Further, in another embodiment, the first hydraulic cylinder 1 and the second hydraulic cylinder 2 can be arranged in a separated state.

Hydraulic oil is supplied to and discharged from the oil supply pipes 36 and 37 to the extension-side oil chamber 14 and the reduction-side oil chamber 15 of the first hydraulic cylinder 1 through respective oil supply passages formed in the piston rod 13. . Further, oil supply pipes 38 and 3 are provided in the extension-side oil chamber 24 and the reduction-side oil chamber 25 of the second hydraulic cylinder 2, respectively.
Hydraulic oil is supplied and discharged from 9.

In the jack device Y, the extension side oil chamber 14 of the first hydraulic cylinder 1 is connected to the extension side oil chamber 24 and the reduction side oil chamber 25 of the second hydraulic cylinder 2 by a solenoid valve 45.
Is selectively continuous through. The solenoid valve 45 employs a three-position valve. The extension-side oil chamber 14 of the first hydraulic cylinder 1 is in a shut-off state (when the solenoid valve 45 is OFF) or the hydraulic oil discharge side of the second hydraulic cylinder 2 Is controlled so as to communicate with the oil chamber (24 or 25). Incidentally, in the hydraulic circuit of FIG.
Are check valves, and the check valve 35 is a pilot check valve. When the solenoid valve 45 is OFF, the extension-side oil chamber 14 of the first hydraulic cylinder 1 is shut off, and the solenoid valve 45
When the valve chamber SV ₇ of is turned ON, the second hydraulic cylinder 2 on the reduction side oil chamber 25 and the first hydraulic cylinder 1 of the extension-side oil chamber 14 and the oil feeding tube 39, the valve chamber SV _7, via the oil pipe 36 When the valve chamber SV ₈ of the solenoid valve 45 is turned ON, the extension-side oil chamber 24 of the second hydraulic cylinder 2 and the extension-side oil chamber 14 of the first hydraulic cylinder 1 are connected to the oil supply pipe 38 and the valve chamber S.
V ₈ communicates via an oil feed pipe 36.

The jack device Y is operated by a hydraulic circuit shown in FIG. In the hydraulic circuit of FIG. 7, reference numeral 31 denotes a hydraulic oil tank, 32 denotes a motor, 33 denotes a pump,
1 is a first solenoid valve, 42 is a second solenoid valve, 43 is a third solenoid valve, 44 is a fourth solenoid valve, 45 is a fifth solenoid valve, and PS ₁ is a _first solenoid valve.
Pressure switch, PS ₂ for second pressure switch, PS ₃ for third
3 shows a pressure switch. 1st solenoid valve 41
The second solenoid valve 42 employs a two-position valve, and each of the third to fifth solenoid valves 43, 44,
Each of the 45 has a three-position valve. FIG.
Set pressure of the pressure switch in the, in this embodiment, the first pressure switch PS ₁ is 50 Kg / cm ^2, the second pressure switch PS ₂ is 170 kg / cm ^2, the third pressure switch PS ₃ is 132
It is set to Kg / cm ² respectively. In the state of FIG. 7,
Each of the solenoid valves 41 to 45 is in an OFF state.

This jack device Y is shown in FIGS.
(E), the second hydraulic cylinder 2 is turned upward,
The tube 11 of the first hydraulic cylinder 1 is used with being grounded. The jack device Y operates as shown in the flowchart of FIG. 9 to operate the jack device Y in the order shown in FIGS. 8A to 8E.

That is, as shown in FIG. 8 (A), the jack device Y is set between the ground and the object to be processed in a state where the jack device Y is at its minimum size. From this state, whereupon ON the motor start push button as shown in step S ₁ in FIG. 9,
The hydraulic oil in the tank 31 is circulated through the first solenoid valve 41 and the fourth solenoid valve 44 by the pump 33 in FIG. Then, turning ON the ground push button (step S _2), the valve chamber SV ₁ of the first solenoid valve 41 and the valve chamber SV ₂ of the second solenoid valve 42 and the valve chamber SV ₄ of the third solenoid valve 43 4 a valve chamber SV ₆ of the solenoid valve 44 becomes the fifth solenoid valve 45 of the valve chamber SV ₇ and is 0N, respectively (step S _3), hydraulic oil in the contraction side oil chamber 25 of the second hydraulic cylinder 2 and the first hydraulic It is supplied into the extension-side oil chamber 14 of the cylinder 1. Then, during the first pressure switch PS ₁ has detected a hydraulic oil supply pressure (Step S _4), the thrusting jack device Y is between the ground and the object to be treated, the hydraulic oil supply pressure is first pressure switch When the set value of PS ₁ is reached, the first pressure switch P
S ₁ is actuated and the ground push button is turned off (each valve chamber SV ₁ , S
_{V 2, SV 4, SV 6} , SV 7 completes a set of jack device Y turned OFF) (step S _5). At this time, in the jack device Y, the piston 22 of the second hydraulic cylinder 2 is at the lower movement position, and the piston 12 of the first hydraulic cylinder 1 is also at the lower position, for example, as shown in FIG. Has become.

Next, in order to raise the workpiece from this state, the ascending side of the ascending / descending mode is selected (step S ₆ ), and then the ascending push button is turned on (step S ₇ ).
Then, the valve chamber SV ₆ of the fourth solenoid valve 44 fifth
Valve chamber SV ₇ of the solenoid valve 45 is turned ON (Step S _8), is supplied hydraulic fluid to a second hydraulic cylinder 2 extension side oil chamber 24 the piston 22 is only a small stroke L shown in FIG. 8 (A) elevated → second hydraulic fluid on the reduction side oil chamber 25 of the cylinder 2 is introduced into the first hydraulic cylinder 1 extended side oil chamber 14 through the valve chamber SV ₇ → piston 12 in FIG. 8 (B ) Is raised by a small stroke M → the operating oil in the reduction side oil chamber 15 of the first hydraulic cylinder 1 is returned to the tank 31 side. When the second hydraulic cylinder 2 the piston 22 is uppermost dynamic, working oil supply pressure is high, and its working oil supply pressure reaches the second pressure set pressure switches PS ₂ (Step S _9), the fifth solenoid valve 45 is switched to the valve chamber SV ₈ side (the valve chamber SV ₇ as shown in step S ₁₀ is O
FF, the valve chamber SV ₈ is ON). Then, the hydraulic oil supply direction to the second hydraulic cylinder 2 is switched as shown in FIG. 8C → hydraulic oil is supplied into the reduction side oil chamber 25 of the second hydraulic cylinder 2, and the piston 22 is moved to the position shown in FIG. moves downward as shown in D) → hydraulic oil in the second hydraulic cylinder 2 extension side oil chamber 24 is introduced into the first hydraulic cylinder 1 extended side oil chamber 14 through the valve chamber SV ₈ → piston 12 Rises by the small stroke M → the operating oil in the reduction side oil chamber 15 of the first hydraulic cylinder 1 is returned to the tank 31 side. When the second hydraulic cylinder 2 the piston 22 is lowermost, the hydraulic oil supply pressure is high, and its working oil supply pressure reaches the second pressure set pressure switches PS ₂ (step S _11), the fifth
Solenoid valve 45 is switched to the valve chamber SV ₇ side (the valve chamber SV ₈ as shown in step S ₁₂ is OFF, the valve chamber SV ₇ is ON), the flow returns to step S _9.

Hereinafter, steps S ₉ to S ₁₂ shown in FIG. 9 are automatically repeated several times to
Is continuously extended to a predetermined length, for example, as shown in FIG. 8E (the object to be processed is raised to a desired height).
Thereafter, when the raising push button is turned off (the fourth solenoid valve 4 and the fifth solenoid valve 45 are turned off, respectively), the extension operation of the jack device Y is stopped, and the workpiece is held in that state. Become.

For example, to reduce the jack device Y in the extended state shown in FIG. 8E (to lower the workpiece supported at the raised position), the following is performed. First select the descending side mode in step S ₆ in FIG. 9, followed by operating the lowering push button (step S _13). Then, the fourth valve chamber SV ₅ of solenoid valves 44 and the valve chamber SV ₇ of the fifth solenoid valve 45 is turned ON (step S ₁₄₎ → hydraulic oil to the first hydraulic cylinder 1 on the reduction side oil chamber 15 is (At this time, the check valve 35 is opened by the pilot pressure.) → The hydraulic oil in the extension-side oil chamber 14 of the first hydraulic cylinder 1 passes through the oil pipe 36, the valve chamber SV ₇ , and the oil pipe 39. 2
Hydraulic oil in the extension side oil chamber 24 of the second hydraulic cylinder 2 is introduced into the reduction side oil chamber 25 of the hydraulic cylinder 2
And the first hydraulic cylinder 1 is reduced by one stroke range (stroke M in FIG. 8B).
When the piston 22 of the second hydraulic cylinder 2 moves to the lowest position, the hydraulic oil supply pressure increases, and the hydraulic oil supply pressure becomes the third hydraulic oil supply pressure.
And it reaches the set pressure of the pressure switch PS ₃ (step S _15), the valve chamber SV ₇ as shown in the fifth solenoid valve 45 is switched to the valve chamber SV ₈ side (Step S ₁₆ is OF
F, the valve chamber SV ₈ is ON). Then, the hydraulic oil supply direction to the second hydraulic cylinder 2 is switched, and the hydraulic oil in the extension-side oil chamber 14 of the first hydraulic cylinder 1 passes through the oil supply pipe 36, the valve chamber SV ₈ , and the oil supply pipe 38. It is introduced into the extension-side oil chamber 24 of the second hydraulic cylinder 2 → the piston 22 of the second hydraulic cylinder 2 moves up → the operating oil in the reduction-side oil chamber 25 of the second hydraulic cylinder 2 returns to the tank 31 side Being the first
The hydraulic cylinder 1 is reduced by the stroke range M. When the piston 22 of the second hydraulic cylinder 2 moves to the maximum, the hydraulic oil supply pressure increases, and the hydraulic oil supply pressure becomes the third hydraulic oil supply pressure.
And it reaches the set pressure of the pressure switch PS ₃ (step S _17), the fifth solenoid valve 45 is switched to the valve chamber SV ₇ side (step S _18), the flow returns to step S _15.

Hereinafter, steps S ₁₅ to S ₁₈ shown in FIG. 9 are automatically repeated several times to
Is continuously reduced to a predetermined length, for example, as shown in FIG. After that, the lowering push button is turned off (fourth
When the solenoid valve 4 and the fifth solenoid valve 45 are respectively turned off), the reducing operation of the jack device Y stops. When the jack device Y is reduced by a predetermined small stroke M in this manner, even when a large load is applied to the jack device, the object to be processed can be slowly lowered, so that it is safe.

[0041] Further, when it is desired to rapidly reduce the jack device Y, pressing the rapid lowering push button (not shown), the valve chamber SV ₅ of the valve chamber SV ₄ and the fourth solenoid valve 44 of the third solenoid valve 43 is turned ON (The fifth solenoid valve 45 remains OFF), and the hydraulic oil in the extension-side oil chamber 14 of the first hydraulic cylinder 1 can be continuously returned to the tank 31 without passing through the second hydraulic cylinder 2. , Rapid reduction becomes possible.

As described above, in the jack device Y of FIG.
Stroke range L of piston 22 of second hydraulic cylinder 2
(E.g., 50 to 60 mm), it is possible to precisely extend or contract by an amount of expansion and contraction M corresponding to the amount of expansion and contraction. The small stroke range M can be accurately raised. In this way, even when the jack device Y is extended or contracted in small increments, the first hydraulic cylinder 1 is moved by a small stroke range M by each of the two hydraulic cylinders 2 at the time of both extension and contraction operations. Since the jack device Y can be extended or contracted, the jack device Y can be operated to a desired range in a short time (speed can be increased).

The jack device Y with a locking device according to the present embodiment is used, for example, as shown in FIGS.
That is, in the embodiment of FIG. 3, two jack devices Y are used for the object 10 to be processed, and the upper and lower mounting seats 81 and 82 are used.
Are fixed to the side surfaces of the workpiece 10 respectively. When the object 10 is a super-large structure such as an oil tank, for example, a large number of jack devices Y are arranged around the super-large structure. When the jack device Y shown in FIGS. 1 and 2 is set, the adjustment-side screw member 73 is screwed up to the highest position with respect to the reference-side screw member 72.

Then, from the set state of FIGS. 1 and 2,
When the jack devices Y, Y are sequentially extended by the same amount (small stroke M) in synchronization with each other as described above, the slider 7 and the workpiece 10 are moved as the second hydraulic cylinder 2 moves upward. When the workpiece 10 is moved up to the desired height as shown in FIG. 3, the extension operation of the jack devices Y, Y is stopped. At this time, the hydraulic oil in each of the jack devices Y, Y is sealed. At this time, the slider 7 is in the state shown in FIG. 6A, and the ring body 74 is supported by each ring receiver 75 at a position separated below the adjustment-side screw member 73.

Next, as shown in FIG. 6B, each groove 1 on the outer peripheral surface of the cylinder tube 11 of the first hydraulic cylinder 1
Of the 6, 16, ..., slider 7 lower end (ring receiver 7
(5 lower end) in one concave groove 16 which is exposed in the immediate vicinity position,
The locking pins 6, 6 are fitted from the left and right outer sides, respectively. Subsequently, when the adjustment side screw member 73 is screwed in the extension direction (downward movement direction) by grasping the handles 76, 76, first, each locking pin 6 in which the lower surface of the ring body 74 is fitted into the concave groove 16. , 6 and the adjusting side screw member 73
When the is screwed downward, the lower surface of the adjustment-side screw member 73 comes into contact with the upper surface of the ring body 74 as shown in FIG. In this state, the adjustment side screw member 73 is stretched between the locking pins 6 and 6 and the reference side screw member 72 so that the load applied to the slider 7 can be supported by the locking pins 6 and 6. Become. And this FIG.
In the state (C), the slider 7 (heavy object 10) is supported by the cylinder tube 11 via the locking pins 6 and 6 even if the support function of the jack device Y by the hydraulic pressure is released. When the heavy object 10 is lowered from the state in which the heavy object 10 is supported by the locking device, the jack device Y is slightly extended, and the adjusting side screw member 73 is moved upward to the position shown in FIG. Screwing each locking pin 6, 6 into the groove 16
The jack device Y may be reduced with the locking pin 6 removed.

As described above, when the locking device according to the embodiment of the present application is used, when the heavy object 10 is lifted to a desired height,
The jack device Y can be extended at a stretch to the required length. And when supporting heavy objects with the locking device,
After fitting the locking pins 6 and 6 into the predetermined concave grooves 16, it is only necessary to screw the adjustment-side screw member 73 in the extension direction (downward movement direction), so that the operation is simplified. Further, this locking device adopts a configuration in which the locking pins 6, 6 are fitted into the concave grooves 16 formed on the outer peripheral surface of the cylinder tube 11, so that the bolts are used as pillars as in the related art (FIG. 10). Compared to the case where the screw 62 is large and long, the processing cost of the screw is high, it can be manufactured at a lower cost, and a part of the jack device Y (cylinder tube 11) can be effectively used as a locking device. Further, in a device in which a large number of concave grooves 16, 16,... Are formed at predetermined small intervals on the outer peripheral surface of the cylinder tube 11, as in the locking device of this embodiment,
In a state where the jack device Y is extended by an arbitrary length (a state in which the heavy object 10 is levitated to an arbitrary height), the jack device Y can be locked so as not to be reduced.

When a super-large structure is levitated, a large number of jack devices Y are arranged around the structure, and these jack devices Y are simultaneously expanded and contracted to maintain the structure in a horizontal posture. It can be moved up and down automatically while it is kept. When a plurality of jack devices Y are used to move the structure up and down in this way, it is preferable to incorporate a synchronization circuit that operates the jack devices Y and Y in synchronization in the hydraulic circuit.

Further, the jack device of the present invention can be used upside down (the cylinder tube 11 is in an upright position). In that case, the tail side of the cylinder tube 11 is connected to the heavy object 10, and the tip (or the slider 7) of the piston rod 13 is grounded. When the jack device (hydraulic cylinder) is extended from this set state, the cylinder tube 11 moves upward (in this case, the slider 7 does not move up and down), and the structure 10 can be levitated. Further, in order to make the locking device function in this state, the locking pins 6 and 6 are fitted into the concave groove 16 exposed at a position immediately near the tip (upper end) of the slider 7, and then the adjustment-side screw member 73 is connected. The ring body 74 is pressed against the locking pins 6 and 6 from the lower surface side by screwing in the extending direction (upward moving direction). In this state, the adjustment-side screw member 73 is
, And the load applied to the cylinder tube 11 can be supported by the portions of the locking pins 6 and 6.

In the embodiment of the present invention, the first hydraulic cylinder 1 having a long stroke and the second hydraulic cylinder 2 having a short stroke are used as the jack device Y. The jack device Y may be constituted only by the cylinder. Further, in another embodiment, at least one concave groove 16 formed on the outer peripheral surface of the cylinder tube 11 may be provided.

[0050]

Locking device effects the present invention of claim 1 of the invention according to claim 1 according to the present invention, the recessed groove 16 formed on the outer peripheral surface of the cylinder tube 11 of the jack device Y, outside the concave groove 16 A locking pin 6 which is removably fitted from and held at the position thereof, is connected to the piston rod 13 side on the outer periphery of the cylinder tube 11 and slides along the outer surface of the cylinder tube 11 in its length direction. When the locking pin 6 is fitted into the groove 16 while the slider 7 is loosely fitted, a part of the locking pin 6 protrudes outside the inner peripheral surface of the slider 7 and the slider 7 is engaged. It is configured to be able to abut against the stop pin 6. Therefore, the invention of claim 1 of the present application has the following effects.

First, as compared with a conventional (FIG. 10) locking device using a large-diameter and long bolt (high screw processing cost), the processing is simpler and the manufacturing cost is lower.

Further, since the locking pin 6 can be fitted into the concave groove 16 from the side thereof, it is not necessary to screw the nut over a long dimension range as in the case of a long bolt. The operation at the time of use can be performed easily and in a short time.

Further, since the concave groove 16 for fitting the locking pin 6 into the cylinder tube 11 of the jack device Y is formed, the cylinder tube 11 is effective as a part of the locking device in addition to the function as the jack. Available.

Advantageous Effects of the Invention of Claim 2 The invention of claim 2 of the present application provides the locking device of claim 1
The slider 7 includes a reference side screw member 72 connected to the piston rod 13 side and an adjustment side screw member 73 screwed to the reference side screw member 72.
Since the distance between the reference side screw member 72 and the locking pin 6 fitted in the concave groove 16 is made to protrude in step 3, in addition to the effect of claim 1, the structure can be raised to a desired height. As it is (without reducing the jack device Y)
There is an effect that the load applied to the jack device Y can be supported by the locking pin 6.

[Brief description of the drawings]

FIG. 1 is a side view of a jack device with a locking device according to an embodiment of the present invention.

FIG. 2 is a left side view of the jack device of FIG.

FIG. 3 is a diagram showing a state in which a heavy object is levitated by using two jack devices of FIG. 1;

FIG. 4 is an enlarged sectional view of a portion IV in FIG. 3;

FIG. 5 is a view taken in the direction of arrows VV in FIG. 4;

FIG. 6 is a work process diagram using the locking device of the embodiment of the present application.

FIG. 7 is a hydraulic circuit diagram of the jack device of FIG.

FIG. 8 is an operation sequence diagram of the jack device of FIG. 1;

FIG. 9 is a flowchart showing an operation sequence of the jack device of FIG. 1;

FIG. 10 is an operation sequence diagram of the conventional jack device for a super-large structure.

[Description of Signs] 1 is a hydraulic cylinder, 6 is a locking pin, 7 is a slider, 1
1 is a cylinder tube, 13 is a piston rod, 16 is a concave groove, 72 is a reference side screw member, 73 is an adjustment side screw member,
74 is a ring body, and Y is a jack device.

Claims (2)

[Claims] 1. A jack device using a hydraulic cylinder (1) having a structure in which a piston rod (13) moves up and down with respect to a cylinder tube (11), wherein a concave groove (16) is formed on an outer peripheral surface of the cylinder tube (11). )
A locking pin (6) which is removably fitted into the concave groove (16) from the outside thereof and is held at the position thereof, and the piston rod (6) is provided on the outer periphery of the cylinder tube (11). 13) A slider (7) connected to the side and slidable along the outer surface of the cylinder tube (11) in its length direction is loosely fitted, and a locking pin (6) is fitted into the groove (16). In the state in which is inserted, a part of the locking pin (6) protrudes outside the inner peripheral surface of the slider (7), and the slider (7) can abut the locking pin (6). A locking device for a jack device, characterized in that: 2. The slider (7) according to claim 1, wherein:
Is provided with a reference side screw member (72) connected to the piston rod (13) side, and an adjustment side screw member (73) screwed to the reference side screw member (72) and capable of moving up and down. The adjustment side screw member (73) makes the adjustment side screw member (73) stretch between the reference side screw member (72) and the locking pin (6) fitted in the concave groove (16) by the screw rotation operation of the side screw member (73). A locking device for a jack device, characterized in that: