KR100510751B1 - Air jack using oil jack and air booster - Google Patents

Abstract

The present invention relates to an air manipulator comprising an hydraulic jack for lifting an object and an air booster for raising the ram of the hydraulic jack, comprising: a pedestal formed with a wheel and a carrying handle; A hydraulic cylinder having a ram mounted therein and an oil tank for storing oil, the hydraulic jack having an internal and external dual structure; A hydraulic circuit unit integrally formed under the hydraulic jack; An air booster comprising an air booster having a pump for discharging oil stored in an oil tank of a hydraulic jack to a hydraulic cylinder by a piston reciprocating forward and backward in a booster cylinder and a reciprocating action of the piston. A ram valve chamber formed below the ram; A ram ball valve elastically installed in the ram valve chamber with a spring; An overflow passage located above the ram valve chamber and horizontally penetrating toward both sides of the ram; An overflow pull pin formed to an outer diameter smaller than an inner diameter of the overflow passage and exposed to both sides of the ram through both ends of the overflow passage; A connecting passage connecting an intermediate portion of the ram valve chamber to an overflow passage; The invention is characterized in that the hydraulic jack including an overflow device made of an operating pin installed between the ramball valve and the overflow pin in the state installed in the connection passage with the air booster.

Description

Air jack using oil jack and air booster

The present invention relates to an air grinder comprising a hydraulic jack for lifting an object (mainly a vehicle) and an air booster for raising the ram of the hydraulic jack.

As a prior art related to the air grinder composed of a hydraulic jack and an air booster, there is a utility model registration No. 249992, which is a pneumatic supply valve for an air booster that pumps oil stored in an oil tank of a hydraulic jack to a hydraulic cylinder of a hydraulic jack. It is characterized by an improved structure.

However, since the conventional air booster is installed with the pneumatic supply valve exposed to the outside of one side of the booster cylinder, the phenomenon of contacting or colliding with other objects and the infiltration of foreign matter (oil dust) during use It is pointed out that the failure rate is high as a disadvantage, and that the noise is generated when the piston of the air booster is released to the outside through the valve during the reverse operation.

In addition, since the air compressor of the related art is configured to supply air pressure only to the air booster, the air stored in the oil tank of the hydraulic jack is not pumped smoothly during the piston reciprocating operation of the air booster. This is because when the oil stored in the oil tank is pumped to the hydraulic cylinder, when the air pressure is not supplied to the oil tank, the oil pumping operation of the air booster is not performed smoothly, and the air in the oil tank flows into the hydraulic pumping chamber of the air booster. This will appear, if the air flows into the hydraulic pumping chamber, the pumping operation of the oil is not made properly, there is a problem that the ram of the hydraulic jack rises slowly.

On the other hand, to solve the above problems, the air booster when the air booster pumps the oil stored in the oil tank of the hydraulic jack has been introduced to provide an air pressure to the oil tank, but this is supplied to the oil tank of the hydraulic jack Since the air pressure is injected under high pressure, the air pressure of high pressure flows into the hydraulic cylinder and raises the ram.However, the ram actuated by pneumatic pressure has a low lifting pressure and can lift an object (vehicle, etc.). It was not practical because it was not.

Therefore, the present invention has been made in view of the above-mentioned general matters, and most of the pneumatic pressure supplied to the air booster is used to operate the piston, and as a means for supplying a part of the pneumatic pressure to the oil tank of the hydraulic jack in a low pressure state. The oil pumping operation of the air booster is performed smoothly, and when the hydraulic jack's ram reaches the maximum operating state, an overflow device is provided at the bottom of the ram to return the hydraulic pressure supplied to the hydraulic cylinder of the hydraulic jack to the oil tank. It is a structure to be installed to protect the air booster, so that the operator can use the air machine safely, and also to reduce the production cost of the air booster by reducing the number of assembly parts of the air booster pneumatic valve device. Further secure the pneumatic valve Another object of the present invention is to improve the structure of the pneumatic supply device of the air booster so as to dampen the noise generated when the protective box and the simultaneous pneumatic pressure are released.

The present invention as a means for achieving the above object,

A pedestal with a wheel attached at the front and a carrying handle formed at the rear; A front side of the pedestal, a hydraulic cylinder in which a ram is liftable and an oil tank for storing oil, the hydraulic jack having an internal and external dual structure; A hydraulic circuit part integrally formed at the lower part of the hydraulic jack to supply oil (hydraulic) stored in the oil tank to the hydraulic cylinder or to return oil (hydraulic) introduced into the hydraulic cylinder to the oil tank and a check valve; ; In the rear side of the pedestal, the oil stored in the oil tank of the hydraulic jack is pumped into the hydraulic cylinder of the hydraulic jack by the reciprocating operation of the piston and the piston reciprocating forward and backward in the booster cylinder and the booster cylinder fixedly installed. In the air grinder composed of the air booster having a pumping stand,

A ram valve chamber formed at a ram lower end of the hydraulic jack;

A ram ball valve elastically installed in the ram valve chamber with a spring;

An overflow passage located above the ram valve chamber and horizontally penetrating toward both sides of the ram;

An overflow pull pin formed to an outer diameter smaller than an inner diameter of the overflow passage and exposed to both sides of the ram through both ends of the overflow passage;

A connecting passage connecting an intermediate portion of the ram valve chamber to an overflow passage;

An operation pin installed between the ram ball valve and the overflow pin in a state in which the connection path is inserted into the connection passage;

It is characterized in that the hydraulic jack including an overflow device made of a configuration with the air booster,

In addition, the upper side of the hydraulic cylinder of the hydraulic jack to form a overflow passage for returning the hydraulic pressure to the oil tank when the hydraulic pressure continues to flow into the hydraulic cylinder even when the ram is in the maximum operation operation, the diameter of the overflow passage oil tank It is characterized in that it is formed with a very small diameter of about 1mm so that the pneumatic pressure supplied to the inflow low pressure can not overcome the elastic force of the spring to support the ramball valve of the over-pro apparatus.

And, the front is attached to the wheel and the rear is a support handle is formed; A front side of the pedestal, a hydraulic cylinder in which a ram is liftable and an oil tank for storing oil, the hydraulic jack having an internal and external dual structure; A hydraulic circuit part integrally formed at the lower part of the hydraulic jack to supply oil (hydraulic) stored in the oil tank to the hydraulic cylinder or to return oil (hydraulic) introduced into the hydraulic cylinder to the oil tank and a check valve; ; In the rear side of the pedestal, the oil stored in the oil tank of the hydraulic jack is pumped into the hydraulic cylinder of the hydraulic jack by the reciprocating operation of the piston and the piston reciprocating forward and backward in the booster cylinder and the booster cylinder fixedly installed. In the air grinder composed of the air booster having a pumping stand,

It is airtightly assembled on one side of the booster cylinder of the air booster, and a part of the pneumatic pressure supplied from the compressor is supplied to the booster cylinder while the other part is formed in the pneumatic operation chamber for bypass supply to the oil tank of the hydraulic jack. A pneumatic supply side flange;

A valve assembly mounted to the pneumatic operation chamber of the pneumatic supply side flange to control the operation of supplying air pressure to the booster cylinder and the operation of discharging air pressure to the outside;

A pneumatic release noise valve fixed to the pneumatic supply side flange while wrapping the valve assembly to reduce the occurrence of noise during pneumatic discharge;

A noise protection cylinder having a pneumatic discharge hole fixedly installed in a state of covering the pneumatic discharge noise valve to discharge pneumatic pressure;

It is characterized in that the air booster made, including a configuration with a hydraulic jack,

In addition, the pneumatic operation chamber of the pneumatic supply side flange is formed in a single-layered circular structure in three stages with a valve assembly having a large diameter, a pneumatic moving portion having a middle diameter, and a small diameter pneumatic inlet portion being opened toward the outside. The inlet part is formed by connecting a pneumatic supply passage for guiding the inflow of pneumatically supplied from the outside, the pneumatic moving part has at least one supply injection hole communicating with the booster cylinder and a pneumatic bypass passage for bypassing pneumatic supply to the hydraulic jack It is characterized by being formed,

In addition, the pneumatic release sound valve is a valve operating chamber formed in an open state toward the pneumatic supply side flange, and protruding in the periphery of the valve operation chamber allows the opening and closing operation of the valve assembly and is discharged through the valve assembly at the same time It characterized in that it comprises a projection formed with a plurality of incisions for releasing the pneumatic pressure, an annular groove cut toward the outer circumference, and a plurality of noise holes penetrating both sides of the annular groove,

In addition, the inside of the noise protection cylinder is characterized in that it is equipped with a filter for preventing the inflow of foreign substances with the action of reducing the noise emitted to the plurality of pneumatic discharge holes.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a side view showing the overall configuration for explaining the present invention, Figures 2 and 3 is a cross-sectional view of the operating state of the air booster of the present invention, Figure 4 is a cross-sectional view taken along the line AA of Figure 2, Figure 5 6 is an exploded perspective view partially showing the valve structure of the air booster, and FIGS. 6 to 8 are cross-sectional views of an operation state of the hydraulic jack of the present invention, and FIGS. 9 and 10 are hydraulic circuit parts of the hydraulic jack shown in cross-sectional view taken along line BB of FIG. The operating state is shown in cross section.

Reference numeral 1 denotes a bottom plate, 2 a hydraulic jack, and 3 an air booster.

The bottom plate 1 is made of a steel plate material, the wheel 11 is mounted on the front and the movement knob 12 is attached to the rear inclined upward toward the rear.

The hydraulic jack 2 is vertically fixed to the front side of the bottom plate 1, and the air booster 3 is horizontally fixed to the rear side of the bottom plate 1.

The hydraulic jack 2 has a hydraulic circuit part 4 formed at a lower end thereof, and an oil tank 2a in which oil is stored on the upper surface of the hydraulic circuit part and a hydraulic cylinder 2b installed in the oil tank. Consists of

The hydraulic circuit unit 4 is formed with a hydraulic pumping passage 42 to which the hydraulic pumping pipe 41 is connected, and the hydraulic pumping passage 42 is a hydraulic suction passage for sucking oil stored in the oil tank 2a. And 43 are connected to a hydraulic discharge passage 44 for supplying hydraulic pressure to the hydraulic cylinder 2b or for recovering the hydraulic pressure to the oil tank 2a.

In addition, the hydraulic circuit part 4 opens the hydraulic suction passage 43 when the hydraulic pressure is sucked from the hydraulic pumping passage 42, while the suction ball valve closes the hydraulic suction passage 43 when discharging the hydraulic pressure. 45 is installed in the hydraulic discharge passage 44, the cylinder connecting passage 46 for supplying the hydraulic pressure into the hydraulic cylinder (2b) and the tank connecting passage for returning the hydraulic pressure to the oil tank (2a) 47 is formed.

The hydraulic discharge passage 44 is provided with a return ball valve 48 for controlling the hydraulic flow back to the tank connection passage 47, the return ball valve 48 is the hydraulic circuit portion (4) It is installed to open and close the tank connection passage 47 by the hydraulic control cock 49 is assembled to the screw.

The oil tank 2a of the hydraulic jack 2 is provided with an oil supplement port 21 sealed by a nipple and a pneumatic injection port 23 to which a pneumatic bypass hose 22 is connected, and the hydraulic cylinder 2b. The ram 24 is mounted up and down by hydraulic pressure.

An overflow device is provided at the lower end of the ram 24. The overflow device includes a ram valve chamber 51 opened downward in the lower end of the ram 24 and an overflow passage 52 positioned horizontally through both sides of the ram valve chamber at an upper end of the ram valve chamber. And a connecting passage 53 connecting the ram valve chamber with the overflow passage, a ram ball 55 elastically installed in the ram valve chamber 51 with a spring 54, and the overflow passage 52. The overflow pin 56 is inserted and installed so that both ends are exposed, and the operation pin is inserted into the connection passage 53 to open the ram ball valve 55 by the falling operation of the overflow pin 56. It consists of 57.

And the upper end of the hydraulic cylinder (2b) is fixed to the cylinder ring 24 for allowing the lifting operation of the ram (5) while preventing the leakage of hydraulic pressure, the ram 5 is directly under the cylinder ring The overflow passage 25 is provided to allow the oil tank 2a to overflow the hydraulic pressure that overflows to the ram valve chamber 51 → the connecting passage 53 → the overflow passage 52 when it is raised to the maximum. The overflow passage 25 is formed with a diameter of about 1mm very small.

On the other hand, the hydraulic control cock 49 screwed to the hydraulic circuit section 4 is opened and closed operation of the recovery ball valve 48 by a manual adjustment section 13 installed to enable the rotation operation on the movable handle 12 side. To control.

Next, the air booster 3 is horizontally fixed to the rear side of the bottom plate 1.

The body of the air booster (3) is composed of a booster cylinder 31 of a cylindrical shape, a pneumatic supply side flange (32a) and a pneumatic discharge side flange (32b) fixedly assembled to both sides of the booster cylinder, The pneumatic supply side flange 32a is equipped with a valve assembly 6 for supplying air pressure to the booster cylinder 31 and the hydraulic jack 22, and a pneumatic release noise valve 7 for releasing air pressure to the outside. The pneumatic discharge side flange 32b is equipped with a pumping pipe 81 for supplying hydraulic pressure to the hydraulic jack 22 by the pumping operation of the piston 8 reciprocating in the booster cylinder 31.

One side of the pneumatic supply side flange (32a) is attached to the structure in which the pneumatic supply connector 33 is connected to the pneumatic supply hose 33 is connected to the pneumatic supply hose for supplying air pressure from the compressor (not shown), the other side of the hydraulic jack (2) The pneumatic bypass connector 34 to which the pneumatic bypass hose 22 for bypassing pneumatic pressure to the oil tank 2a is connected is attached to the screw assembly structure.

The pneumatic operation chamber 35 is formed at an outer surface side central portion of the pneumatic supply side flange 32a with an opening toward the outside. The pneumatic operation chamber 35 has a valve assembly 351 having the largest diameter. It consists of the pneumatic movement part 352 and the pneumatic inflow part 353 which diameter becomes small gradually on the reference | standard.

The pneumatic supply connector 33 and the pneumatic inlet 353 of the pneumatic operation chamber 35 is connected by a pneumatic supply passage 36, the pneumatic bypass connector 34 and the pneumatic operation chamber 35 The pneumatic moving part 352 is connected by the pneumatic bypass passage 37.

In addition, one or more pneumatic injection holes 354 penetrating toward the booster cylinder 31 are formed in the pneumatic moving part 352.

Next, the pneumatic operation chamber 35 is equipped with a valve assembly 6 for controlling the pneumatic pressure supplied to the pneumatic supply passage (36).

The valve assembly 6 includes a fixed valve 61 assembled in a fixed state to the valve assembly 351 of the pneumatic operation chamber 35 and an operation valve 62 movably assembled in the center of the fixed valve 61. ), And a working plate 64 that is elastically supported by a spring 63 that is elastically installed on the pneumatic inlet portion 353 is configured to be screwed into the fastening bolt 65, the operation valve 62 is The small diameter part 62a which is installed to penetrate the center of the fixed valve 61 movably, and the large diameter part 62b which are exposed to one side (left side of the figure) of the fixed valve 61 are integrally formed, and the said In the small diameter portion 62a and the large diameter portion 62b, a plurality of pneumatic discharge grooves 62c for releasing pneumatic pressure are formed, and a packing (not shown) is attached to the outer circumference of the large diameter portion 62b.

Next, an outer side of the pneumatic supply side flange 32a is provided with a pneumatic release noise valve 7 for reducing the occurrence of noise when discharging the pneumatic.

A valve operating chamber 71 is formed at the center of one side (right side in the drawing) of the pneumatic discharge valve 7 to reciprocately receive the operation valve 62 of the valve assembly 6. At the periphery of the operation chamber 71, a cylindrical protrusion 72 is formed, in which several incisions 73 for releasing pneumatic pressure are formed while movably receiving the large diameter portion 62b of the operation valve 62.

In addition, the outer periphery of the pneumatic release valve 7 is formed with an annular groove 74 for reducing noise during pneumatic discharge and a plurality of noise holes 75 penetrating to both sides of the annular groove 74, The pneumatic discharge silencer 7 is assembled in a fixed state to the outer surface of the pneumatic supply side flange 32a by means of several assembly bolts 76.

In addition, a pneumatic return passage 77 is formed at the center of the valve operation chamber 71 of the pneumatic discharge valve 7. The pneumatic return passage 77 is an air booster by a pneumatic return hose 78. It is connected to the bypass hole 31a formed in one side of the booster cylinder 31 of (3).

And the outer periphery of the pneumatic discharge valve (7) is installed with a noise protection cylinder (9) wrapped around, the noise protection cylinder (9) is a pneumatic discharge hole (91) for discharging the pneumatic pressure to the outside In addition, a filter 92 is installed inside to prevent foreign matter from penetrating into the pneumatic discharge hole 91 while further reducing noise.

Next, a pumping table 83 elastically installed with a spring 82 is fixed to the piston 8 mounted inside the booster cylinder 31 of the air booster 3. The pumping table 83 is pneumatically installed. The oil (hydraulic) stored in the oil tank (2a) of the hydraulic jack (2) is inserted into the pumping pipe (81) fixed at the center of the discharge flange (32b) is sucked through the hydraulic pumping pipe 41, and then hydraulic The operation of discharging to the cylinder 2b is performed.

On the other hand, the movement knob 12 is provided with a pneumatic valve 13 is connected to the pneumatic hose withdrawn from the compressor, the pneumatic supply hose 14 and the pneumatic supply hose (13) is connected to the pneumatic supply valve (13) It is connected.

The operation of the present invention configured as described above will be described.

When the air blower connects the pneumatic hose drawn from the compressor to the pneumatic valve 13 and then opens the pneumatic valve 13, the air booster 3 operates first, and then the hydraulic jack 2 operates. .

The operating state of the air booster 3 will be described.

2 shows a state in which the piston 8 of the air booster 3 has completed the reverse operation. In this case, the bypass hole 31a is the front and rear airtight members a and b of the piston 8. ), The valve assembly 6 is elastically supported in the pneumatic return passage 77 of the pneumatic return hose 78 and the pneumatic release silencer 7 between the front airtight member a. Pneumatic pressure greater than the elastic force of the spring 63 is acting so that the operating plate 64 of the valve assembly 6 closes the pneumatic inlet 353.

In the above state, the pneumatic pressure supplied to the pneumatic supply hose 14 flows into the pneumatic inlet portion 353 through the pneumatic supply passage 36 of the pneumatic supply side flange 32a, and at this time, to the pneumatic inlet portion 353. The inlet air pressure has a pressure higher than the air pressure acting on the pneumatic return passage 77.

Therefore, the pneumatic pressure flowing into the pneumatic inlet portion 353 pushes the operation plate 64 of the valve assembly 6 so that the valve assembly 6 moves toward the pneumatic release valve 7 as shown in FIG. 3. When moved, the pneumatic operation chamber 35 is opened.

When the valve assembly 6 is opened as described above, the pneumatic pressure introduced into the pneumatic inlet 353 is moved (supplied) to the pneumatic injection hole 354 and the pneumatic bypass passage 37 formed in the pneumatic moving part 352. In this case, the pneumatic injection hole 354 is directly connected to the booster cylinder 31 having a large internal cross-sectional area, while the pneumatic bypass passage 37 has a small internal diameter pneumatic bypass connector 34 and pneumatic pressure. Since the bypass hose 22 and the pneumatic inlet 23 are connected to the oil tank 2a of the hydraulic jack 2, most of the pneumatic pressure introduced into the pneumatic inlet 353 is a high pressure booster cylinder ( 31 is supplied to the oil tank 2a in a low pressure state.

As described above, the high pressure pneumatic pressure supplied to the booster cylinder 31 pushes the piston 8 forward to operate the pump 8, thereby discharging the hydraulic pressure sucked into the pumping pipe 81.

On the other hand, when the piston 8 starts the forward operation, the pneumatic pressure existing on the front side of the piston is discharged to the pneumatic discharge port 38 mounted on the pneumatic discharge side flange 32b to advance the piston 8. The operation is performed smoothly. When the piston 8 completes the forward operation, that is, the rear gastight member b is out of the bypass hole 31a, the piston 8 is moved forward. As the pneumatic pressure instantly flows into the bypass hole 31a → pneumatic return hose 78 → pneumatic return passage 77 and flows into the valve operation chamber 71, it pushes the operation valve 62 of the valve assembly 6, As shown in FIG. 2, the operation plate 64 of the valve assembly 6 overcomes the elastic force of the spring 63 and seals the pneumatic inlet 353. In this case, the large diameter portion of the operation valve 62 62) is moved toward the projection portion 72 of the pneumatic release valve (7) Thus, the pneumatic pressure flowing into the valve operation chamber 71 is discharged through several incisions 73 formed in the protrusion 72.

When the pneumatic pressure acting on the piston 8 is released to the cutout 73 of the pneumatic release valve 7 in the state where the piston 8 completes the forward operation as described above, the piston 8 is spring 82. When the piston 8 reaches the point of completion of the backward operation of the piston 8, the valve assembly 6 is opened again by the pneumatic inflow into the pneumatic inlet 353, and the pneumatic pressure is booster cylinder 31. ) And the piston 8 is pushed out again. Therefore, the piston 8 is to repeat the forward and backward operation.

On the other hand, the pneumatic pressure released to the cutout portion 73 formed in the pneumatic release noise valve (7) when the piston (8) in the reverse operation is diffused into the noise protection cylinder (9), the noise protection cylinder The inner space of (9) acts to delay the flow velocity of the pneumatic pressure while widening the space area by the annular groove 74 and the plurality of noise holes 75 formed on the outer circumference of the pneumatic release valve 7. Therefore, the noise generated when the pneumatic pressure is discharged to the outside through the plurality of pneumatic discharge holes 91 formed in the noise protection cylinder (9) is to be significantly reduced. In addition, the noise generated during the discharge of pneumatic pressure by the filter 92 mounted inside the noise protection cylinder 9 will be further reduced.

Next, the operation of the hydraulic jack 2 will be described.

As shown in FIG. 6, when the ram 5 of the hydraulic jack 2 is to be raised and lowered, the manual adjustment section 13 is rotated as shown in FIG. 9 to recover the ball valve 48. ) Operates the air booster 3 in a state in which the discharge end of the hydraulic discharge passage 44 is closed to start the ram 5 of the hydraulic jack.

When the air booster 3 operates to move the piston 8 forward, most of the pneumatic air flowing into the pneumatic operation chamber 35 is supplied to the booster cylinder through the pneumatic injection hole 35, and a pneumatic bypass passage ( 37) Pneumatic pressure moving through the low pressure state is supplied to the oil tank (2a) through the pneumatic bypass hose 22, the low pressure state air pressure supplied to the oil tank (2a) in this way is the internal pressure of the oil tank (2a) By increasing the hydraulic suction operation of the pumping stand 83 is to be made smoothly. In addition, since the overflow passage 25 formed in the upper portion of the hydraulic cylinder 2b is drilled with a very small diameter, even if the low pressure pneumatic pressure introduced into the oil tank 2a flows into the overflow passage 25, the overflow pin ( The phenomenon that the 56 presses the operation pin 57 is not generated.

Therefore, when the piston (8) of the air booster (3) is reversely operated and the pumping table (83) installed in the pumping pipe (81) also works backward and generates a suction force in the pumping pipe (81), the suction ball valve 45 opens the hydraulic suction passage 43 so that the oil stored in the oil tank 2a is sucked into the pumping pipe 81 through the hydraulic suction passage 43 and the hydraulic pumping passage 42, and the piston ( 8) When the pumping stand 83 moves forward, the suction ball valve 45 closes the hydraulic suction passage 43, so that the hydraulic pressure discharged from the pumping pipe 81 is the hydraulic pumping passage 42. → the hydraulic discharge passage 44 → the cylinder connecting passage 46 is introduced into the hydraulic cylinder (2b), and thus the ram (5) is raised by the amount of hydraulic pressure flowing into the hydraulic cylinder (2b), The ram 5 is driven by the hydraulic pressure flowing into the hydraulic cylinder 2b by the repeated pumping operation of the pumping stand 83. When the air booster 3 stops operating in a raised state as described above, the oil stored in the oil tank 2a is not pumped to the hydraulic cylinder 2b anymore, and the hydraulic pressure introduced to the hydraulic cylinder 2b is not supplied. Also, the oil tank 2a is not recovered, and thus the ram 5 is held in a state of lifting an object (vehicle) in a stopped state at an elevated position.

On the other hand, when the air booster 3 continues to operate even when the ram 5 is fully raised as shown in FIG. 8, the overflow pin 56 is caught by the cylinder ring 24 while the operating pin 57 In this case, the actuating pin 57 presses the ramball valve 55 to open the connecting passage 53, so that the hydraulic pressure flowing into the hydraulic cylinder 2b is connected to the connecting passage 53 → the overflow passage. (52) is recovered to the oil tank (2a) via the overflow passage (25).

As described above, when the air booster 3 continues to operate even when the ram 5 is fully operated, the hydraulic pressure supplied to the hydraulic cylinder 2b is recovered to the oil tank 2a and thus the air booster ( Overload does not appear in 3), so it is possible to prevent the trouble of air booster in advance.

When the ram 5 of the hydraulic jack 2 is to be lowered, as shown in FIG. 10, the manual adjustment section 13 is rotated in a direction opposite to that of the ram 5 ascending operation to recover the ball valve. When the 48 opens the tank connecting passage 47, the hydraulic pressure introduced into the hydraulic cylinder 2b passes through the cylinder connecting passage 46 and the hydraulic discharge passage 44 to open the tank connecting passage 47. As the oil tank (2a) is recovered through the lowering operation of the ram (5) is made.

The present invention as described above can eliminate the phenomenon that the air booster is overloaded because the hydraulic oil flowing into the hydraulic cylinder overflows into the oil tank even if the air busher continues to operate even when the ram of the hydraulic jack completes the upward operation. It is effective to prevent the occurrence of failure rate of the air booster, and it also has a structure that forms a pneumatic operation chamber, a pneumatic supply passage and a pneumatic flow passage in the pneumatic supply side flange which is airtightly assembled on one side of the booster cylinder of the air booster. By simplifying the pneumatic control valve structure to supply and discharge, it is possible to reduce the production cost by reducing the number of assembly parts. Also, the noise generated during pneumatic discharge can be reduced by the pneumatic release noise valve and the noise protection cylinder. The effect is to provide.

1 is a side view showing the overall configuration for explaining the present invention.

2 and 3 is a cross-sectional view of the operating state of the air booster of the present invention,

     2 is a state in which the piston is reversed,

     3 is a piston advanced state.

4 is a cross-sectional view taken along the line A-A of FIG.

Figure 5 is a partial cross-sectional view to show the valve structure of the air booster of the present invention

       Exploded perspective view.

6 to 8 is a cross-sectional view of the operating state of the hydraulic jack of the present invention,

     6 is a state in which the ram is lowered,

     7 is a state in which the ram is raised,

     8 is a state in which the hydraulic pressure overflows in the ram rise condition.

9 and 10 are cross-sectional views taken along the line B-B of Figure 6, the hydraulic circuit portion operating state of the hydraulic jack

       Cross-section.

※ Explanation of code for main part of drawing

1: bottom plate 2: hydraulic jack

2a: oil tank 2b: hydraulic cylinder

3: air booster 4: hydraulic circuit part

5: ram 6: valve assembly

7: Silent valve for pneumatic discharge 8: Piston

9: noise protection cylinder 13: pneumatic valve

25: month flow passage 31: booster cylinder

32a: Pneumatic supply side flange 32b: Pneumatic discharge side flange

41: hydraulic pumping pipe 42: hydraulic pumping passage

43: hydraulic suction passage 44: hydraulic discharge passage

45: suction ball valve 46: cylinder connecting passage

47: tank connection passage 48: ball valve for recovery

49: hydraulic control cock 51: ram valve chamber

52: overflow passage 53: connection passage

55: ram ball valve 56: overflow pin

57: operation pin 61: fixed valve

62: operating valve 64: operating plate

71: valve operation chamber 72: protrusion

73: incision 74: annular groove

75: noise hole 77: pneumatic return passage

81: pumping pipe 82: spring

83: pumping table 91: pneumatic discharge hole

Claims (6)

A pedestal with a wheel attached at the front and a carrying handle formed at the rear; A front side of the pedestal, a hydraulic cylinder in which a ram is liftable and an oil tank for storing oil, the hydraulic jack having an internal and external dual structure; A hydraulic circuit part integrally formed at the lower part of the hydraulic jack to supply oil (hydraulic) stored in the oil tank to the hydraulic cylinder or to return oil (hydraulic) introduced into the hydraulic cylinder to the oil tank and a check valve; ; In the rear side of the pedestal, the oil stored in the oil tank of the hydraulic jack is pumped into the hydraulic cylinder of the hydraulic jack by the reciprocating operation of the piston and the piston reciprocating forward and backward in the booster cylinder and the booster cylinder fixedly installed. In the air grinder composed of the air booster having a pumping stand, A ram valve chamber formed at a ram lower end of the hydraulic jack; A ram ball valve elastically installed in the ram valve chamber with a spring; An overflow passage located above the ram valve chamber and horizontally penetrating toward both sides of the ram; An overflow pull pin formed to an outer diameter smaller than an inner diameter of the overflow passage and exposed to both sides of the ram through both ends of the overflow passage; A connecting passage connecting an intermediate portion of the ram valve chamber to an overflow passage; An operation pin installed between the ram ball valve and the overflow pin in a state in which the connection path is inserted into the connection passage; Air jack comprising a hydraulic jack and an air booster, characterized in that the hydraulic jack comprising an overflow device consisting of an air booster. The method of claim 1, One side of the hydraulic cylinder upper end of the hydraulic jack to form a flow passage for returning the hydraulic oil to the oil tank when the hydraulic pressure continues to flow into the hydraulic cylinder even when the ram is operated up to the maximum, the diameter of the overflow passage to the oil tank Air compressor consisting of a hydraulic jack and an air booster, characterized in that formed in a very small diameter of about 1mm so that the supplied pneumatic flow into the low pressure that can not overcome the elastic force of the spring supporting the ramball valve of the over-pro apparatus. A pedestal with a wheel attached to the front and a movable handle formed at the rear; A front side of the pedestal, a hydraulic cylinder in which a ram is liftable and an oil tank for storing oil, the hydraulic jack having an internal and external dual structure; A hydraulic circuit part integrally formed at the lower part of the hydraulic jack to supply oil (hydraulic) stored in the oil tank to the hydraulic cylinder or to return oil (hydraulic) introduced into the hydraulic cylinder to the oil tank and a check valve; ; In the rear side of the pedestal, the oil stored in the oil tank of the hydraulic jack is pumped into the hydraulic cylinder of the hydraulic jack by the reciprocating operation of the piston and the piston reciprocating forward and backward in the booster cylinder and the booster cylinder fixedly installed. In the air grinder composed of the air booster having a pumping stand, It is airtightly assembled on one side of the booster cylinder of the air booster, and a part of the pneumatic pressure supplied from the compressor is supplied to the booster cylinder while the other part is formed in the pneumatic operation chamber for bypass supply to the oil tank of the hydraulic jack. A pneumatic supply side flange; A valve assembly mounted to the pneumatic operation chamber of the pneumatic supply side flange to control the operation of supplying air pressure to the booster cylinder and the operation of discharging air pressure to the outside; A pneumatic release noise valve fixed to the pneumatic supply side flange while wrapping the valve assembly to reduce the occurrence of noise during pneumatic discharge; A noise protection cylinder having a pneumatic discharge hole fixedly installed in a state of covering the pneumatic discharge noise valve to discharge pneumatic pressure; An air booster consisting of a hydraulic jack and an air booster, characterized in that the air booster made with a hydraulic jack. The method of claim 3, wherein The pneumatic operation chamber of the pneumatic supply side flange is formed in a single-layered circular form in three stages with a valve assembly having a large diameter, a pneumatic moving portion having a middle diameter, and a small diameter pneumatic inflow portion open to the outside. The air supply unit is connected to the pneumatic supply passage for guiding the inflow of pneumatic pressure supplied from the outside, the pneumatic moving unit is formed with one or more supply injection hole communicating with the booster cylinder and a pneumatic bypass passage for bypass supply of the pneumatic pressure to the hydraulic jack Air jack consisting of a hydraulic jack and air booster, characterized in that. The method of claim 3, wherein The pneumatic discharge silencer is a valve operation chamber formed in an open state toward the pneumatic supply side flange, and the valve assembly is formed to protrude from the periphery of the valve operation chamber allows the opening and closing operation of the valve assembly and the pneumatic discharged through the valve assembly Air consisting of a hydraulic jack and an air booster, characterized in that it comprises a projection formed with a plurality of incisions for releasing to the outside, an annular groove cut toward the outer circumference, and a plurality of noise holes penetrating both sides of the annular groove Small. The method of claim 3, wherein An air grinder comprising a hydraulic jack and an air booster, wherein a filter is provided in the noise protection cylinder to prevent foreign substances from being introduced together with a function of reducing noise emitted to a plurality of pneumatic discharge holes.