JP2553353B2 - Hydraulic jack - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hydraulic jack used for pushing up or lowering a lower part of a blade of a heavy object such as an airplane.

[Conventional technology]

A hydraulic jack shown in FIG. 11, for example, has been developed as a hydraulic jack for moving up and down a relatively large structural heavy object, such as an aircraft blade.

A ram 3 is vertically movably inserted into a cylinder 1 through a piston 2, a leg 5 is connected to an upper portion of the cylinder 1 through a bracket 4, and a caster 6 is provided below each leg 5. A spring 5 for urging the leg 5 upward is interposed between the caster 6 and the leg 5.

When lifting a heavy object, the entire hydraulic jack is conveyed below the load supporting point via the caster 6, and then the caster is slightly moved at a right angle by inputting or levering to align the ram with the jack point. There is.

When the ground on which the legs 5 are grounded has an inclination or unevenness, each leg 5 is expanded and contracted and the length of each leg 5 is adjusted to make the ram 3 stand up to the weight.

After adjusting the horizontal and vertical directions of the cylinder 2 and the ram 3 with respect to the jack point in this way,
To push up the weight. On the other hand, when the ram 3 is lowered, it is lowered to a position where the load of the heavy object does not act on the ram 3. At this time, the leg 5 and the cylinder 2
Rises, and in this state, the leg 5 is manually compressed to end the operation.

[Problems to be solved by the invention]

With the above-mentioned hydraulic jack, when aligning with the jack point of the load supporting part of heavy objects, especially when the ground is inclined or uneven, the length of the leg is adjusted manually, However, there is a problem that the larger the hydraulic jack, the more labor is required and the working efficiency is deteriorated.

Therefore, the present invention is to provide a hydraulic jack in which vertical adjustment with respect to a jack point of the hydraulic jack is easy and accurate, and working efficiency can be significantly improved.

[Means for solving problems]

In order to achieve the above-mentioned object, the structure of the present invention is such that a hydraulic jack main body provided with a plurality of legs is floatably arranged on a dolly, and a plurality of casters are arranged under the dolly, and each caster is a dolly. It is characterized in that it is connected directly to the drive cylinder provided in the above or via an arm, and the truck and the hydraulic jack main body move up and down according to the expansion and contraction amount of the drive cylinder.

[Work]

When the drive cylinder is installed vertically, the carriage and the hydraulic jack body move up and down according to the amount of expansion and contraction of the drive cylinder, and when the drive cylinder is connected to the caster via the arm, this drive cylinder is When the arm expands and contracts, the arm rotates and the caster moves. Then, the arm is displaced from the horizontal position to the vertical position, the bogie and the hydraulic jack main body move up and down according to the expansion and contraction amount of the drive cylinder, and the height can be adjusted.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 10.

A hydraulic cylinder 9 is movably erected on a carriage 8, and a ram 10 is vertically movably inserted into the hydraulic cylinder 9 to form a hydraulic jack body A.

A ring bracket 11 is connected to the outer periphery of the upper portion of the hydraulic cylinder 9, and upper base ends of legs 15, 16 and 17 are pivotally attached to brackets 12, 13 and 14 extending to the outer periphery of the ring bracket 11 via shafts. The lower portions of these legs 15, 16 and 17 are rotatably coupled to a support 19 via spherical bearings 18, respectively.

The dolly 8 includes a base 20, a pair of casters 23a and 23b connected to the lower part of the base 20 via a bracket 21, an arm 22 and a third drive cylinder 74, and a bracket 24 and a fourth drive cylinder on the base 20. It is composed of a lever 47 connected via 75 and a caster 26 provided in the lower part of the fourth drive cylinder 75. By pulling the lever 47, the entire hydraulic jack can be moved to an arbitrary position via the casters 23, 26. It can be moved.

When moving the entire hydraulic jack to any position,
15,16,17 are floating from the ground, and they are in a certain position, for example,
When reaching the jack point below the wings of the airplane, which is a heavy object, extend each leg 15,16,17 and abut the support base 19 on the ground, and support the bottom of the wings of the airplane with these legs 15,16,17 It is becoming like this.

 Next, details of the hydraulic jack body A will be described.

As shown in FIG. 3, the piston 27 is placed in the hydraulic cylinder 9.
The ram 10 is vertically movably inserted through the cylinder head 28 and a cylinder head 28, and a pressure chamber 29 is defined below the hydraulic cylinder 9. The pressure chamber 29 is selectively connected to a pump or a tank as a hydraulic source via a port 30. It is connected to the.

A male screw portion 31 is formed on the outer periphery of the ram 10, and a female screw 33 of a lock nut 32 rotatably arranged above the cylinder head 28 is screwed into the male screw portion 31 to form a lock nut.
32 is used as a stopper to position the ram 10,
A flange-shaped spur gear 36 is formed above the lock nut 32.

A key groove 34 is formed in the ram 10 along the axial direction, and a key 35 protruding from the inner periphery of the cylinder head 28 is fitted into the key groove 34 to guide the vertical movement of the ram 10. .

A horizontal bracket 37 is connected to the upper side of the ram 10 outside, and the other side of the bracket 37 is connected to an upper part of a screw rod 38 parallel to the ram 10.

A fixed housing 40 is connected to the outer periphery of the upper portion of the hydraulic cylinder 9 via a bracket 39, and a screw nut 43 is rotatably held in the housing 40 via bearings 41 and 42. The threaded rod 38 penetrates the housing 40 and the screw nut 43 in the vertical direction, and has a male screw portion 44a engraved on the outer periphery of the threaded rod 38.
Engages with the female screw portion 44b formed on the screw nut 43. The lead angle of the male screw part 44a is formed larger than the lead angle of the screw part 31 of the ram 10.

A spur gear 45 is integrally connected to the screw nut 43 or via a bolt 46, and the spur gear 45 is a spur gear of the lock nut 32.
36 meshes with.

When hydraulic pressure is introduced from the port 30 to the pressure chamber 29, the ram 10 rises. At this time, the screw rod 38 moves upward through the bracket 37. At this time, the screw nut 43 rotates via the male screw 44a and the female screw 44b, and this rotational force is transmitted to the lock nut 32 via the spur gears 45 and 36 to rotate it in the opposite direction.
Therefore, the lock nut 32 does not rise along with the ram 10,
It is held in a fixed position on the cylinder head 28 while rotating.

Therefore, when the ram 10 is raised to a predetermined position and stopped, the lock nut 32 is held by the cylinder head 28, and the load is held by the hydraulic pressure of the pressure chamber 29 acting on the ram 10 meshing with the lock nut 32. The sinking of the ram 10 due to an accidental oil leak in the pressure chamber 29 is prevented by locking the lock nut 32 on the cylinder head 28.

When lowering the ram 10, high-pressure oil is returned from the pressure chamber 29 to the tank and lowered by the weight of the ram 10. At this time, screw rod 38
Is also lowered, the screw nut 43 rotates in the opposite direction to the above case, and at the same time, the lock nut 32 is rotated in the opposite direction to the above case via the spur gears 45 and 36 so as not to interfere with the downward movement of the ram 10. I have to. When the hydraulic jack 9 is composed of a multi-stage extension ram, each ram may be provided with a lock nut, a screw rod, and a gear mechanism as described above.

Next, a fine adjustment positioning mechanism for the hydraulic cylinder 9 will be described.

That is, the hydraulic jack pulls the handle 47,
Although it moves to the lower part of the heavy object via 23 and 26, accurate positioning cannot always be performed with respect to the jack point, and the hydraulic cylinder 9 may tilt due to unevenness on the ground. Therefore, the hydraulic jack according to this embodiment is provided with a horizontal alignment mechanism and a height adjustment mechanism.

The horizontal alignment mechanism is performed by moving the cylinder 9 on the carriage 8.

 This basic principle is shown in FIGS.

The first drive cylinder for horizontal drive on the base 20 of the truck
48 and a second drive cylinder 49 are provided, one first drive cylinder 48 being arranged horizontally on the line xx 'and the other second drive cylinder 49 being on the line yy'. The two first and second drive cylinders 48, 49, which are horizontally arranged, are connected to the hydraulic cylinder 9, and their extension lines are orthogonal to each other.

The base 20 is provided with three slide members 50, 51, 52,
The legs 15, 16, 17 are slidably connected to the slide members 50, 51, 52 via brackets 53, 54, 55.

Hydraulic cylinder 9 and legs 15, 16, 17 are slide members 50, 51,
The hydraulic cylinder 9 and the legs 15, 16 and 17 as a whole are arranged in the x direction by extending the first drive cylinder 48 in the x direction, for example. Move
When the other second drive cylinder 49 is extended, for example, in the y direction, the hydraulic cylinder 9 and the legs 15, 16, 17 move in the y direction.
The first and second drive cylinders 48, 49 are respectively replaced by x ', y'
When compressed in the same direction, the hydraulic cylinder 9 and legs 15, 16, 17
Moves in the x ', y'directions. Therefore, the top of the ram 10 of the hydraulic cylinder 9 can be accurately aligned with the lower part of the jack point by expanding and contracting the first and second drive cylinders 48, 49 with respect to the jack point each time.

The configuration based on the above-mentioned basic principle is specifically shown in FIGS.
A description will be given based on the embodiments shown in FIGS. 6, 6 and 7.

The first drive cylinder 48 has a bracket 56 at the bottom of the base 20.
The piston rod of the first drive cylinder 48 is connected to a bracket 57, which penetrates through a central hole 81 formed in the base 20, the upper part of which is the lower part of the hydraulic cylinder 9. When the first drive cylinder 48 is extended and contracted by being connected to the flange 58 provided on the hydraulic cylinder 9, the hydraulic cylinder 9 moves in the xx 'direction.

The base end of the second drive cylinder 49 is connected to a bracket 59 standing upright on the base 20, and the piston rod of the drive cylinder 49 is connected to the main body of the hydraulic cylinder 9. However, it may be coupled to the flange 58 via another bracket. Second
When the drive cylinder 49 of is expanded and contracted, the hydraulic cylinder 9 is moved to y-
Move in the y'direction.

The slide members 50, 51, 52 are arranged on the base 20 at equal intervals, for example, at an interval of 60 degrees. This slide member 50,51,52
Is a hollow rectangular frame 60 with a stainless plate 60 'on the bottom, a slide frame 63 as a hollow guide slidably inserted into the frame 60 via left and right bearings 61 and 62, and a slide. From the slider 66 slidably inserted in the frame 63 through the front and rear bearings 64, 65 and the bottom bearing 67, and the bracket 69 standing on the slider 66 and provided with a plurality of mounting holes 68 in different directions. It is configured. Each of the bearings 61, 62, 64, 65, 67 is formed of a smooth material such as Teflon pad.

The brackets 53, 54, 55 provided on the legs 15, 16, 17 are connected to the brackets 69 of the slide members 50, 51, 52 via bolts inserted in the mounting holes 68. Further, the outer ends of the brackets 71, 72, 73 connected to the flange 58 of the hydraulic cylinder 9 are also connected to the brackets 69 of the slide members 50, 51, 52. At this time, the direction of the slide parts 50, 51, 52 and the leg 1
If the orientation of 5, 16, 17 is displaced, one of the mounting holes 68 corresponding to the direction of the legs 15, 16, 17 is used for bolting. The drive cylinders 48, 49 are driven to move the hydraulic cylinder 9 and the legs 15, 16, 17 in the x-x 'direction or the y-y' direction, and this movement causes the brackets 53, 54, 55 and the brackets to move.
Bracket 69 for slide members 50, 51, 52 via 71, 72, 73
Is transmitted to

For example, as shown in FIG. 6, the hydraulic cylinder 9 and the leg
When 15, 16, 17 move in the x direction, the slider 66 slides in the x direction guided by the slide frame 63, and when it moves in the y direction, the slider 66 becomes integral with the slide frame 63 and forms a frame body.
It is guided by 60 and moves in the y direction.

Therefore, the expansion and contraction amounts of the first and second drive cylinders 48, 49 are selected to select the hydraulic cylinder 9 in the xx 'direction or the yy' direction.
And the legs 15, 16 and 17 are pushed or pulled, the slide frame 63 or the slider 66 slides in the same direction, and the hydraulic cylinder 9
Finely adjust to any position.

 Next, the height adjustment mechanism of the hydraulic jack will be described.

This is to horizontally correct the hydraulic cylinder 9 which is tilted when there is unevenness on the ground, and the basic principle is shown in FIGS. 4 and 5.

Casters 23a, 23b, and 26 are arranged at a lower portion of the base 20 at intervals of about 120 degrees, and the casters 23a and 23b are pivotally attached to a bracket 21 provided on the lower portion of the base 20 by a shaft 78 so as to be rotatable.
It is disposed at one end of 22. Third drive cylinders 74 are arranged between the other end of the arm 22 and the base 20, respectively.
Therefore, as the third drive cylinder 74 expands and contracts, the arm 22 rotates via the shaft 78 and the base 20 moves up and down.

The casters 26 are arranged at the lower end of a fourth drive cylinder 75 vertically arranged on the base 20, and the base 20 moves up and down as the fourth drive cylinder 75 expands and contracts.

Therefore, the base 20 is moved up and down by adjusting the expansion and contraction movements of the two third drive cylinders 74 connected to the casters 23a and 23b via the arms 22 and the fourth drive cylinder 75 provided with the casters 26. It can be adjusted horizontally or horizontally.

A concrete configuration based on the above basic principle is shown in the embodiment of FIG.

An arm 22 as a link is pivotally attached to an end of a bracket 21 provided on the base 20 via a shaft 78, and a caster 23 is attached to the arm 22.
Is connected to the rotating material.

Similarly, a third height-adjusting drive cylinder 74 indicated by a dotted line is disposed below the base 20 via a bracket, and a piston rod of the drive cylinder 74 is pivotally attached to the other end of the arm 22.

Therefore, when the third drive cylinder 74 is expanded and contracted, the arm 22 is displaced from the horizontal position to the vertical position, at which time the caster 23 is also moved, and the base 20 corresponding to the angle of the arm 22 is moved up and down. The height is the lowest when the arm 22 is horizontal, and the highest when the arm 22 is vertical.

A caster 26 is pivotally attached to the lower end of the fourth drive cylinder 75 connected to the base 20, and the base 20 is moved up and down by the expansion and contraction operation of the fourth drive cylinder 75.

As described above, for example, when pushing up the lower part of the wing of an airplane, which is a heavy object, the entire hydraulic jack is conveyed to the desired position via the lever 47 and the casters 23a, 23b, 26, and roughly aligned visually. .

Next, with respect to the jack point, the xx 'direction or y-
When the top of the ram 10 is displaced in any of the y'directions, the first and second drive cylinders 48, 49 are driven to correct the displacement in the right angle direction.

Further, when the ground is inclined or the base 20 and the hydraulic cylinder 9 are inclined with respect to the jack point due to unevenness, the third drive cylinder 74 and the fourth drive cylinder 75 are used.
By expanding and contracting and adjusting the height, one of the bases 20 is pushed up or pulled down to correct the inclination of the pressing cylinder 9.

In this way, when the hydraulic cylinder 9 is accurately aligned with the jack point, each leg 15, 16, 17 is manually operated.
The support base 19 at the tip is extended, grounded on the ground, and locked.

Next, in this state, the ram 10 may be extended to push up the jack point which is a load supporting point of the heavy object, but the third drive cylinder 74 and the fourth drive cylinder 75 are previously set so that the load does not act on the casters 23. High-pressure oil is returned to the tank side to release the pressure. It should be noted that the third drive cylinder 74 and the fourth drive cylinder 75 are in a state in which the legs 15, 16 and 17 are not grounded, or even when the legs 15, 16 and 17 are grounded In this case, it is preferable to connect a relief valve 79 in the circuit as shown in FIG. 8 so that the caster 23 does not carry the load.

Next, the basic principle of another embodiment of the present invention shown in FIGS. 9 and 10 will be described.

In this, the lower portion of the hydraulic cylinder 9 is projected downward through the central hole 81 of the base 20, the supporting member 80 is extended to the lower portion, and the supporting member 80 supports the base 20.

As described above, when the hydraulic jack is installed at the load supporting point and the pressures of the third drive cylinder 74 and the fourth drive cylinder 75 are released, the base 20 moves to the third drive cylinder 74 and the fourth drive cylinder 75. The cylinder 75 contracts by its own weight as much as it contracts, but at this time, the support member 80 provided on the hydraulic cylinder 9 is the base.
In order to support the lower surface of the base 20, the base 20 is eventually held by the legs 15, 16 and 17 via the hydraulic cylinder 9, and the base 20 does not descend any further. Therefore, the mounting portions of the first and second drive cylinders 48, 49 are prevented from being bent or displaced.

Scales are engraved on the support member 80, and the hydraulic cylinder 9
When moved in the -x 'and yy' directions, the amount of movement can be confirmed, and the positioning in the direction perpendicular to the jack point becomes easy. Incidentally, the concrete shape of the supporting member 80 and its positional relationship are shown by dotted lines in FIG. According to this specific example, three support members 80 are extended at 120 degree intervals.

〔The invention's effect〕

 The present invention has the following effects.

When the drive cylinder is expanded or contracted, the bogie directly moves up or down, or the arm rotates to set the height of the bogie corresponding to the angle of the arm, and the verticality of the ram with respect to the jack point can be finely adjusted.

Height adjustment can be done remotely via a drive cylinder, and no manual leg length adjustment is required, improving work efficiency, ensuring reliable and quick adjustment, and safe work.

[Brief description of drawings]

1 is a front view of the hydraulic jack, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a sectional view of the body of the hydraulic jack, FIG. 4 is a plan view showing the principle of horizontal adjustment, and FIG. Fig. 6 is a front view showing the principle of vertical adjustment, Fig. 6 is an enlarged plan view of a slide member, Fig. 7 is a front view of Fig. 6, Fig. 8 is a hydraulic circuit diagram, and Fig. 9 is a principle of a support mechanism of a bogie. FIG. 10 is a plan view of FIG. 9, taken along the line AA ′ of FIG. 9, and FIG. 11 is a sectional view of a conventional hydraulic jack. 8 ... carriage, 9 ... hydraulic cylinder, 10 ... ram, 15,16,
17 …… leg, 21 …… bracket, 22 …… arm, 23a, 23
b, 26 …… Caster, 27 …… Piston, 74,75 …… Drive cylinder, A …… Main body.

Claims (5)

(57) [Claims] 1. A hydraulic jack main body provided with a plurality of legs is rotatably arranged on a carriage, and a plurality of casters is arranged at the lower portion of the carriage, and each caster is directly connected to a drive cylinder provided on the carriage or an arm. A hydraulic jack characterized in that the carriage and the hydraulic jack main body move up and down according to the amount of expansion and contraction of the drive cylinder. 2. A hydraulic jack according to claim 1, wherein the drive cylinder is mounted vertically on the carriage. 3. The hydraulic jack according to claim 1, wherein the drive cylinder is pivotally attached to a bracket provided on the lower portion of the carriage. 4. The hydraulic jack according to claim 1, wherein three casters are arranged at intervals of 120 degrees. 5. A hydraulic jack according to claim 3, wherein one caster is connected to a vertical drive cylinder, and two casters are connected to another drive cylinder via an arm.