KR100255979B1 - Device for regulations rpm of engine for hydraulic system of crane - Google Patents

Abstract

PURPOSE: An engine acceleration controller is provided to control an engine rpm(revolutions per minute) with a control lever fixed nearby a main control valve without a need of control of an rpm coming around the engine side of vehicle. CONSTITUTION: An engine acceleration controller comprises a main accelerator control lever adjacently fixed to a main control valve on a side of a crane base and a subsidiary accelerator control lever(73) rotatably forward and backward to a fixing frame(52) constituting a subsidiary manipulation lever unit(5) on the other side of the crane base. Herein, a link interlockingly connects accelerator control levers while two driven gears(87,88) are rotatably engaged with interlocking left and right movements of link during axially attached to the two driven axles(81,83). An accelerator lever-connecting-wire(93) is included as well to control an engine rpm by rotating an accelerator lever, pulled and returned depending on rotational amount of gears. The engine rpm is controlled with simply manipulating the main accelerator control lever or the subsidiary accelerator control lever. Therefore, overload placed on the crane is avoided simply.

Description

Engine acceleration control device for crane hydraulic system

The present invention relates to an engine acceleration control apparatus for a hydraulic system of a crane for a vehicle for compensating for the flow rate during overload in a crane for a vehicle mounted on a vehicle to draw the driving force of the engine and use it as a hydraulic power source for driving the operation unit.

In general, vehicle cranes are generally classified into straight and articulated cranes, and they are used as hydraulic power sources for manipulating various operating units by drawing out the driving force of the engine through the PTO shaft to drive the hydraulic pump.

Such a vehicle-mounted crane is mounted on a vehicle largely and has an outrigger at both ends, and has a crane base having a turntable at the center of the upper surface, and a column which is rotatably installed vertically via a turntable bearing installed at an upper portion of the turntable; And a boom extending obliquely upwardly or upside down from the column, and a winch installed along the boom to lift and unload heavy goods.

The crane base is provided with various hydraulic mechanisms such as a hydraulic motor, an oil tank, a hydraulic valve, and the hydraulic transmission by such hydraulic mechanisms is performed by drawing out and using the driving force of the engine through the PTO shaft. That is, the driving force of the engine is transmitted to the hydraulic pump through the PTO shaft, and the hydraulic oil contained in the oil tank is pumped to the main control valve by the hydraulic pump, and the hydraulic oil introduced into the main control valve selects the operating levers for switching the flow path of each valve. In accordance with the conventional operation is carried out by the cylinders or hydraulic motor of each operating unit to selectively operate each operating unit to perform a crane operation. The oil pumped to each operation unit is returned to the oil tank via the main control valve.

On the other hand, the main control valve is composed of approximately four valves. That is, the main control valve is a swing valve for turning the boom left and right by turning the column of the upper turntable from side to side in turn, an extension valve for stretching the boom, and a derrick valve for undulating the boom up and down. And a winch operating valve for driving the winch. In addition, a lower portion of the main control valve is provided with a supply port for injecting the hydraulic oil pumped from the inlet pump, the upper portion of the main control valve is provided with a drain port for draining the hydraulic oil to the oil tank.

The flow path of each valve of the main control valve is made by the movement of the spool, and the movement of the spool is a casting work composed of casting levers which are installed up and down sequentially so that each spool and one end are connected in order to protrude to the left side of the main control valve. It is made independently by selective operation of the cast levers of the lever portion. In addition, even if there is an operator on the opposite side of the main control valve, the right side of the crane base is installed in a fixed frame of a rectangular frame shape so that the flow path to the valves can be changed, and the auxiliary operating levers can be turned back and forth in this fixed frame. A subsidiary operation lever part provided is further provided, and the levers of the sub operation lever part and the levers of the casting operation part are connected to each other by links located at the rear side of the main control valve. Therefore, even if any of the casting operation lever or the auxiliary operation lever is operated, the flow path of the valve can be organically switched by moving the spool by linkages connecting the levers of the casting operation lever and the auxiliary operation levers to each other. .

The hydraulic pressure for operating the crane having the flow path switching structure of the main control valve as described above is set by adjusting the rotational speed of the vehicle engine to be able to perform a proper working speed and working capacity, and usually the accelerator lever on the engine side. The crane is operated while maintaining the state in which it is adjusted by turning to maintain a predetermined number of revolutions.

In the process of crane operation, the moving part is driven while receiving various loads from no load to overload, and the flow rate of the operating hydraulic pressure of the moving part must also be changed according to such various loads, but conventionally, except that the engine rotation speed is controlled by the corresponding means. There was no means. Therefore, when the degree of load changes frequently, there is no time to adjust the engine speed and it is virtually impossible to adjust.

Therefore, when operating the crane at no load while maintaining the engine speed at a high speed so as to obtain a large hydraulic pressure, unnecessary fuel is consumed, resulting in waste of resources and an increase in air pollution. If the overload occurs while the crane is being operated while maintaining the low speed, the required hydraulic pressure cannot be met, resulting in a situation in which it is difficult to carry out the crane work, and the moving parts are broken and the crane is overturned. There is a risk of this.

The present invention has been made in view of the conventional problems as described above, without having to go to the engine side of the vehicle to adjust the rotational speed of the engine individually, it is possible to arbitrarily adjust the rotational speed of the engine with a control lever installed near the main control valve It is an object of the present invention to provide an engine acceleration control device.

1 is a schematic plan view showing a crane base of a crane equipped with an engine acceleration control device according to the present invention.

2 is a front view showing the main control valve of the crane.

Figure 3 is a plan view of the main part showing an operating state of the engine speed control apparatus according to the present invention.

4 is a front view of FIG. 3.

Figure 5 is another main plan view showing an operating state of the engine acceleration control device according to the present invention.

6 is a front view of FIG. 5.

7 is a plan view showing an operating state of the engine acceleration control device according to the present invention.

8 is a perspective view showing still another main portion of the engine acceleration control device according to the present invention.

9 is a plan view showing another example of the operating lever constituting the engine acceleration control apparatus according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: Crane base 3: Main control valve

4: casting operation lever part 5: auxiliary operation lever part

13: oil tank 14: hydraulic pump

31, 33, 35, 37: valve 32, 55: vertical axis

38: spool 34, 75: rotating bracket

39: supply port portion 41: casting work lever

50: link 51: auxiliary operation lever

52: fixed frame 53: upper plate

54: lower plate 57, 58: connecting member

71: main accelerator control lever 73: auxiliary accelerator control lever

81, 83: driven shaft 82, 84: dog

85, 86: drive bracket 87, 88: driven gear

90: driven lever 91: spring

93: accelerator lever connection wire

In order to achieve the above object, the engine acceleration control device according to the present invention is installed on the left side of the crane base of the crane, the main accelerator which is installed in the front and rear pivotable adjacent to the left cast operation lever part of the main control valve constituting the hydraulic system Control lever; An auxiliary accelerator control lever installed on the right side of the crane base so as to be able to swing back and forth on the vertical axis of the fixed frame having a rectangular frame forming an auxiliary operation lever installed vertically corresponding to the casting operation lever part; A link for linking the main accelerator control lever and the auxiliary accelerator control lever to each other; Two driven gears which are respectively fixed to two driven shafts which are rotatably mounted side by side at a predetermined interval in the fixed frame and are engaged with each other in linkage with the horizontal movement of the link; And, one end is connected to one side of the right driven shaft and the other end is connected to the accelerator lever on the engine side, the accelerator lever to adjust the number of revolutions by turning the accelerator lever by pulling and returning according to the amount of rotation of the gears Characterized in that it comprises a connection wire.

According to the present invention, the auxiliary operating levers are rotatably supported on a vertical axis provided in the fixed frame of the auxiliary operating lever part, and two driven shafts are vertically installed in parallel with the vertical axis.

At the end of the auxiliary accelerator control lever of the link, two drive brackets are sequentially installed to protrude forward at intervals wider than the distance between the driven shafts, and correspondingly, in the direction of movement of the link in contact with the drive bracket when the link is moved left and right. The turning dogs are respectively fixed to the driven shafts, and the driven shafts are in contact with each other, and two driven gears rotating in rotation with the driven shafts by the dog's turning are in turn, and the right driven shafts have free ends. A driven lever to which one end of the connecting wire is connected is condensed and protrudes obliquely toward the front left side of the fixed frame.

According to the engine acceleration control device of the present invention configured as described above, the engine rotational speed of the vehicle is appropriately prepared to transmit the driving force of the engine to the hydraulic pump. Next, the crane operation is performed by operating the casting operation levers or the auxiliary operation levers in order to pressurize hydraulic oil from the hydraulic tank to the cylinders or hydraulic motors of the operation units to switch the flow path of each valve of the main control valve. If it is difficult to carry out crane work by overloading the moving part of the crane due to the lack of flow rate for the working hydraulic pressure during the crane work process, the main accelerator control lever or auxiliary gear is not needed on the engine side without turning the accelerator lever. By increasing the amount of fuel supplied to the engine by adjusting the accelerator lever by adjusting the accelerator control lever, the flow rate of the hydraulic oil pumped to the cylinder or hydraulic motor of the operating part is increased to solve the overload. Therefore, the crane work can be performed smoothly.

Other features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

As shown in FIG. 1, reference numeral 1 denotes a crane base mounted on a vehicle, and outriggers are installed on left and right sides to stably support a work load during crane work, and a column supporting left and right on a central portion of the column is supported. A turntable 11 having a turntable bearing 12 is provided on the upper surface for pivotal support.

And the oil tank 13 is provided in front of the crane base 1, and this oil tank 13 is connected with the hydraulic pump 14 driven by the PTO shaft which draws out the engine output of a vehicle. Therefore, when the engine is driven, the hydraulic pump 14 is driven by the transmission of the driving force of the engine by the PTO shaft, and the hydraulic oil in the oil tank 13 is supplied via the hydraulic pump 14 by the suction force of the hydraulic pump 14. Discharged. The discharge flow rate of the hydraulic pump 14 is almost determined by the rotation speed of the engine. That is, the higher the rotation speed of the engine, the larger the discharge flow rate of the hydraulic pump 14 becomes.

The hydraulic pump 14 is connected to the main control valve 3 installed at the rear end of the upper left end of the crane base 1. Therefore, the hydraulic oil discharged from the hydraulic pump 14 is pumped to the main control valve (3).

As shown in FIG. 2, the main control valve 3 includes a swing valve 31 for turning the boom from side to side by rotating the column from the bottom to the top, an extension valve 33 for stretching the boom, And a derrick valve 35 for undulating the boom up and down, and a winch operating valve 37 for driving the winch.

The lower part of the main control valve (3) is provided with a supply port portion (39) connected through the hydraulic pump (14) and the supply pipe (15), and the oil tank (13) and the drain at the top of the main control valve (3). The drain port part 40 connected through the pipe 16 is provided.

Therefore, the hydraulic oil pressurized from the hydraulic pump 14 can be pressurized into the valves through the supply port part 39, and the hydraulic oil pressurized into the valves is switched in accordance with the forward and backward movement of the spools 38. The cylinders or hydraulic motors of each operating unit are pumped or drained to the oil tank 13 through the drain port unit 40.

Port switching by the forward and backward movement of the spool of each valve of the main control valve 3, as shown in Figs. 1, 3, 4 and 7, the casting lever constituting the casting lever portion (4) ( 41 are made independently by individual manipulations. That is, each spool 38 of the valves 31, 33, 35, 37 partially protrudes out of the left side of the valves 31, 33, 35, 37, as shown in FIGS. 1 to 3 and 7. As shown, one end of the casting levers 41 is connected to the protruding portions of the spools 38 so as to be turned back and forth in turn. Therefore, the casting levers 41 are installed vertically in a substantially horizontal state in order to extend to the left side of the main control valve 3 in order, and the casting levers 41 are used to easily identify the purpose of the casting operation levers 41. The stops of 41 are bent at different angles.

In the absence of external force, the casting levers 41 are maintained in a neutral state by springs (not shown) interposed at the connection portion. As shown in FIG. 1, in the neutral state of the casting operation levers 41, the hydraulic oil pumped from the hydraulic pump 14 through the supply pipe 15 and the supply port part 39 is respectively provided by the valves 31, 33, 35,. 37) is drained to the oil tank 13 through the drain port portion 40 through the interior. When the free end of the casting operation levers 41 is held in a neutral state and pulled forward, hydraulic oil pressurized from the hydraulic pump 14 through the supply pipe 15 and the supply port part 39 is applied to each valve 31, 33, 35, 37. ) And the hydraulic oil pumped to the cylinders or hydraulic motors of each operation unit, and the hydraulic oil is transferred to the operation unit again through the valves (31, 33, 35, 37), the drain port portion 40 and the drain pipe (16) Drain to the oil tank 13 through the in turn.

On the other hand, because the main control valve 3 is located on the left end of the crane base 1, the crane driver must operate the casting lever 41 on the left side of the crane base 1, so that the crane is operated by covering the column and the like. 1, 5 to 7, considering that there is a difficult point, the casting lever so that the port of each valve (31, 33, 35, 37) can be switched even on the right side of the crane base (1) An auxiliary operation lever part 5 composed of auxiliary operation levers 51 corresponding to the casting operation levers 41 is installed at the rear side of the upper right end of the crane base 1 in correspondence with the part 4. The operation levers 51 are in turn connected to the casting operation levers 41 by links 50.

That is, the auxiliary operating lever portion 5, as shown in Figures 5 and 6, the fixed frame 52 of the substantially rectangular frame shape that is installed vertically to the rear end of the upper right side of the crane base 1, and the fixed The vertical axis 55 connecting the upper ends of the upper plate 53 and the lower plate 54 of the frame 52 to each other, and the auxiliary operation lever 51 having one end rotatably connected to the vertical axis 55 independently of each other. ) In addition, the connecting members 57 are installed at the connecting portions with the vertical shaft 55 of the auxiliary operating levers 51 to protrude backwards, and also the connecting members with the connecting portions with the spools 38 of the casting operating levers 41. 58 are provided, respectively, and the free ends of the connecting members 57 of the auxiliary operating levers 51 and the free ends of the connecting members 58 of the casting operating levers 41 are sequentially connected by the links 50. Connected. The link 50 is preferably arranged to the rear of the turntable 11.

Accordingly, when the auxiliary operation levers 51 are pivoted to the rear, the spools 58 are moved forward by the casting operation levers 41 turning forward by the interlocking action of the links 50 and the connecting members 57 and 58. When the auxiliary operation levers 51 are released, the casting operation levers 41 are returned to their original positions by the springs interposed with the respective spools 38 and maintain the neutral state so that the spools 58 also return to the neutral state. do.

On the other hand, in the present invention, due to the relation that the operating flow rate acting on each operating unit is set in accordance with the predetermined rotational speed of the engine, the flow rate acting on the operating unit is such that the overload applied to the operating unit of the crane cannot be overcome. It is possible to remotely control the engine speed arbitrarily in the casting lever part 4 or the auxiliary operation lever part 5 without the need to go to the engine side and adjust the engine speed in consideration of the case where the crane work cannot be performed smoothly. It is supposed to be.

That is, the engine acceleration control device according to the present invention, the main accelerator control lever 71, the auxiliary accelerator control lever 73 and another link connecting the accelerator control levers (71, 73) to each other ( 50, and an accelerator lever connecting wire 75 for turning the engine according to the operation of the accelerator adjusting levers 71 and 73.

The main accelerator control lever 71 has one end forward and backward in the left position of the lower feed port portion 39 of the main control valve 3, as in the forward and backward connection structure to the spools 38 of the casting operation levers 41. Possibly supported. That is, the vertical shaft 32 is installed and supported on the left side of the supply port part 39, and the channel type rotation bracket 34 is pivotally coupled to the vertical axis 32, and the main accelerator on the rotation bracket 34. As one end of the control lever 71 is connected, the main accelerator control lever 71 may be rotated back and forth in a state in which it extends to the left side of the main control valve 3 similarly to the casting operation levers 41.

1, 5 to 7, the auxiliary accelerator control lever 73 is connected to the vertical axis 55 of the fixed frame 52 constituting the auxiliary operating lever portion 7 so as to be able to swing back and forth. Is installed. The auxiliary accelerator control lever 73 is preferably connected to the vertical axis 55 in the same manner as the front and rear swing structures of the auxiliary operation levers 51. That is, the channel-type rotating bracket 75 is coupled to the lower end of the vertical shaft 55 positioned below the lowermost auxiliary operating lever 51 in correspondence with the main accelerator control lever 71, and assisted by the rotating bracket 75. When one end of the accelerator control lever 73 is connected, the auxiliary accelerator control lever 73 may be rotated back and forth in a state in which it extends to the right side like the auxiliary operation levers 51.

According to the present invention, at the rear end of the rotation bracket 75 of the auxiliary accelerator control lever 73, another connection member 57 is further protruded to the rear, and correspondingly, rotation of the main accelerator control lever 71 is performed. Another connecting member 58 is further protruded to the rear end of the bracket 34, and the free ends of the connecting members 57 and 58 are rotatable in turn with both ends of the other link 50. Are connected to each other. Therefore, when the main accelerator control lever 41 is turned back and forth, the auxiliary accelerator control lever 73 is turned back and forth by linkage by the link 50 and the connecting members 57 and 58, and the auxiliary accelerator control lever 73 is turned back and forth. Even when turning, the main accelerator control lever 71 pivots back and forth by interlocking by the link 50 and the connecting members 57 and 58.

In addition, according to the present invention, two driven shafts 81 and 83 are arranged between the upper plate 53 and the lower plate 54 of the fixed frame 52 at predetermined intervals in parallel with the vertical axis 55. In turn, it is rotatably installed.

As shown in FIGS. 5 and 6, the portions corresponding to the links 50 of the driven shafts 81 and 83 are rearwardly arranged with the dogs 82 and 84 protruding backwards, and correspondingly the links ( On the front side of 50), two drive brackets 85 and 86 are sequentially installed at predetermined intervals with both dogs 82 and 84 inward. Therefore, when the main accelerator control lever 71 is pivoted backwards or the auxiliary accelerator control lever 73 is pivoted forward, the link 50 moves to the right, so that the left driving bracket 85 of the link 50 is moved. By pushing the left dog 82 to the right, the left driven shaft 81 rotates clockwise. On the contrary, when the link 50 is moved to the left side, the right driving bracket 86 of the link 50 pushes the right dog 84 to the left side, thereby causing the right driven shaft 83 to rotate counterclockwise.

In addition, according to the present invention, driven gears 87 and 88 are fitted to the stop portions of the driven shafts 81 and 83 while being engaged with each other. Preferably, the driven gears 87 and 88 are formed in a substantially fan shape. Therefore, when the left driven shaft 81 rotates clockwise as the link 50 moves to the right, the right driven shaft 83 rotates counterclockwise due to the engagement of the driven gears 87 and 88. On the contrary, when the right driven shaft 83 rotates counterclockwise as the link 50 moves to the left side, the left driven shaft 81 rotates clockwise. That is, even if the link 50 moves in any of the left and right directions, the left driven shaft 81 rotates clockwise and the right driven shaft 83 rotates counterclockwise due to the engagement of the driven gears 87 and 88. Done.

In addition, according to the present invention, as shown in Fig. 5 to 8, the driven lever 90 is condensed to the lower end of the right driven shaft 83 protrudes inclined toward the front left of the fixed frame 52. 9, the driven lever 90 may be formed in an obtuse angle like the boomerang by being integral with the right dog 84. In this case, it is preferable that the bone curved boundary between the driven lever 90 and the right dog 84 is adhered to the right driven shaft 83.

Then, one end of the spring 91 is connected to the front protrusion of the driven lever 90 and the other end of the spring 91 is connected to the lower plate 54 of the fixing frame 52. The other end of the spring 91 is preferably connected to the guide protrusion 92 protruding upward from the upper left end of the lower plate 54. Therefore, when the right driven shaft 83 rotates counterclockwise, the spring 91 is tensioned as the driven lever 90 also turns counterclockwise. When the external force acting on the driven shafts 81 and 83 in the tensioned state of the spring 91 is removed, the driven lever 90 pivots clockwise by the restoring force of the spring 91 so that the driven shafts 81 and 88 rotate. In addition to returning to the original position, the link 50 is also returned to the original position, and thus, the main accelerator control lever 71 and the auxiliary accelerator control lever 73 are also returned to their original positions in the neutral state.

Further, according to the present invention, one end of the accelerator lever connecting wire 93 is connected to the free end of the protrusion of the driven lever 90, and the other end of the connecting wire 93 is connected to the accelerator lever of the engine side. One end of the connecting wire 93 is preferably connected to the free end of the protrusion of the driven lever 90 in the case of the guide protrusion 92.

Therefore, when the driven lever 90 turns counterclockwise, the connecting wire 93 is pulled and the accelerator lever on the engine side is turned to increase the amount of fuel supplied to the engine, thereby increasing the engine speed. As the engine speed increases, the discharge pressure and the flow rate of the hydraulic pump 14 increase, thereby overloading the operation unit. Then, when the driven lever 90 returns to its original position by the restoring force of the spring 91, as the towed connecting wire 93 returns to its original position, the accelerator lever on the engine side also returns to the original position, so the engine rotation speed is The set rotation speed is maintained.

Next, the operation of the engine acceleration control device according to the present invention configured as described above will be described.

After moving the crane to the working place of the crane, the outrigger of the crane base (1) mounted on the vehicle is stretched and well supported on the ground so that the crane does not overturn, and then the engine's driving force is adjusted to a predetermined speed It is drawn out through this PTO shaft and prepared to act on the hydraulic pump 14. In this state, since both the casting levers 41 and the auxiliary operation levers 51 are in a neutral state, the hydraulic oil is supplied from the oil tank 13 by the suction force driven by the hydraulic pump 14. And return to the oil tank 13 via the main control valve (3) does not drive the operating portion of the crane.

In this state, when operating the crane by driving the moving part, the flow paths of the valves 31, 33, 35, 37 of the main control valve 3 are selectively switched to the cylinders or the hydraulic motor of the moving part. By operating the hydraulic oil, the operating unit can be driven, and the hydraulic oil fed to the operating unit is returned to the oil tank 13 via the main control valve 3 again. In order to selectively switch the flow path of the valves 31, 33, 35, 37, a casting lever 41 connected to the spool 38 of the valve or a link 50 connected to the casting lever 41 is provided. When the auxiliary operation lever 51 is rotated, the flow path of the valve can be switched by moving the spool 38 back and forth by interlocking the link 50 and the connecting members 57 and 58.

By operating the operation levers 41 and 51 as described above, the main accelerator control lever 71 or the auxiliary accelerator control lever 73 are turned when the operation part is overloaded while the crane operation is performed by sequentially operating the operation parts. Let's do it. For example, when the auxiliary accelerator control lever 73 is pivoted backward, the link 50 is moved to the left side by the linkage between the link members 58 and 57 of both accelerator control levers 71 and 73 and the link 50 connecting them. The right dog 84 pivots counterclockwise since the right drive bracket 86 of the link 50 pushes the right dog 84 to the left. The right driven shaft 83 rotates counterclockwise by the counterclockwise rotation of the right dog 84, and the right driven gear 88 and the driven lever 90 which are stuck on the right driven shaft 83 are also half Rotate together clockwise. In addition, the left driven gear 87 fixed to the left driven shaft 81 rotates in a clockwise direction in response to the counterclockwise rotation of the right driven gear 88. As a result, the left driven shaft 81 also rotates in a clockwise direction. Turn around. Since the same operation is made even when the main accelerator control lever 71 is pulled forward, the description thereof will be omitted.

In the turning process of the driven shafts 81 and 83 as described above, the connecting wire 93 is tensioned while the spring 91 connected to the driven lever 90 is tensioned by the counterclockwise rotation of the driven lever 90. By being pulled out, the accelerator lever on the engine side connected to the other end of the connecting wire 93 is pivoted, thus increasing the supply amount of fuel supplied to the combustion chamber of the engine. As the amount of fuel supplied to the combustion chamber of the engine is increased in this way, the engine speed is rapidly increased, and the driving force according to the increased engine speed is drawn through the PTO shaft and transferred to the hydraulic pump 14, thereby providing the hydraulic pump 14 Discharge flow rate is rapidly improved. Therefore, the hydraulic pressure acting on the moving part is significantly increased, so that the overload on the moving part of the crane can be sufficiently eliminated.

If the auxiliary accelerator control lever 73 is rotated forward, the link 50 is moved to the right by the linkage between the connecting members 58 and 57 of both accelerator control levers 71 and 73 and the link 50 connecting them. The left dog 82 pivots clockwise because the left drive bracket 85 of the link 50 pushes the left dog 82 to the right. The left driven shaft 81 rotates clockwise by the clockwise turning of the left dog 82, and the left driven gear 87, which is fixed to the left driven shaft 81, also rotates clockwise. According to the clockwise rotation of the left driven gear 87, the right driven gear 88 meshed with the left driven gear 87 rotates counterclockwise as well as the right driven shaft 83 also rotates counterclockwise. You get Even if the main accelerator control lever 71 is rotated to the rear, the same result as that obtained when the auxiliary accelerator control lever 73 is rotated to the front is omitted. That is, regardless of the left and right movement of the link 50, the left driven shaft 81 is always rotated in the clockwise direction and the right driven shaft 83 is rotated in the counterclockwise direction so that the connecting wire 93 of the driven lever 90 When pulled by the counterclockwise rotation and the external force is removed, the driven lever 90 is rotated clockwise to return to the original position by the restoring force of the spring 91, and the other components are also returned to the original position.

According to the engine acceleration control device according to the present invention configured as described above, it is necessary to go near the casting lever part 4 or the auxiliary operation lever part 5 without going to the engine side of the vehicle and adjusting the turning amount of the accelerator lever one by one. Since the engine speed can be arbitrarily adjusted by simply operating the main accelerator control lever 71 or the auxiliary accelerator control lever 73 each time, the crane can be easily eliminated even when the crane is overloaded. Work can be performed efficiently.

Claims (5)

A main accelerator control lever installed on the left side of the base of the crane, the main accelerator control lever being installed to be rotatable back and forth adjacent to the left casting operation part of the main control valve forming the hydraulic system; An auxiliary accelerator control lever installed on the vertical axis of the fixed frame constituting the auxiliary operation lever installed vertically on the right side of the crane so as to be able to swing back and forth in correspondence with the main accelerator control lever; A link for linking the main accelerator control lever and the auxiliary accelerator control lever to each other; Two gears which are respectively fixed to two driven shafts which are rotatably mounted side by side at a predetermined interval in the fixed frame and mesh with each other in linkage with the horizontal movement of the link; And, One end is connected to one side of the right driven shaft and the other end is connected to the accelerator lever of the engine is pulled and returned in accordance with the amount of rotation of the gear to include an accelerator lever connecting wire for adjusting the rotational speed of the accelerator lever to control the engine speed Engine acceleration control device for a hydraulic system of the crane, characterized in that consisting of. The method of claim 1, The main accelerator control lever is rotatably connected back and forth through a channel-type rotating bracket on a vertical shaft installed on one side of the main control valve, The auxiliary accelerator control lever is pivotally connected to the vertical axis of the fixed frame through a channel-type rotating bracket, The rear end of the rotating brackets in turn is provided with a connecting member protruding rearward, The rear end of the connecting member is an engine acceleration control device for a hydraulic system of the crane, characterized in that rotatably connected to both ends of the link in turn. The method of claim 1, Each of the driven shafts is provided with dogs protruding rearwards, and correspondingly, two driving brackets protrude in front of the links at intervals wider than the gaps of the dogs with the dogs inward, and thus the left and right movements of the links are performed. According to the movement of the drive brackets and the dog according to the driven shaft is engaged with each other to rotate the engine acceleration control device for a hydraulic system of a crane, characterized in that the connection wire is to be towed. The method according to any one of claims 1 to 3, A driven lever is installed at one side of the right driven shaft to protrude obliquely toward the left front of the fixed frame, One end of the spring is connected to the protrusion of the driven lever and the other end of the spring is connected to one side of the fixed frame, One end of the connecting wire connected to the accelerator lever on the engine side is connected to the protrusion of the driven lever so that the connecting wire pulled by the restoring force of the spring tensioned by the turning of the driven lever returns to its original position. Engine acceleration control system for hydraulic systems. The method of claim 4, wherein The driven lever is integrally connected with the right dog has an oblique angled form, the bent boundary between the driven lever and the right dog, the engine acceleration control device for a hydraulic system of the crane, characterized in that the axis is fixed to the right driven shaft.