JP2021008364A - Hydraulic crane driving device - Google Patents

Abstract

To provide a hydraulic crane driving device capable of enhancing the degree of freedom of arrangement of directional control valves, and also controlling a manufacturing cost.SOLUTION: A supplementary directional control valve 58 is provided between a second hydraulic pump 48 and a jib derricking and supplementary hydraulic motor 12B. A jib derricking directional control valve 60 is provided between a first hydraulic pump 44 and the jib derricking and supplementary hydraulic motor 12B. A jib derricking and supplementary operation device 68 operates the directional control valve of one of the jib derricking directional control valve 60 and the supplementary directional control valve 58. An operation circuit switching valve 69 is provided between the jib derricking and supplementary operation device 68, and the jib derricking directional control valve 60 and the supplementary directional control valve 58. The operation circuit switching valve 69 performs switching whether to supply pilot pressure according to an operation of the jib derricking and supplementary operation device 68 to the jib derricking directional control valve 60 or to the supplementary directional control valve 58.SELECTED DRAWING: Figure 2

Description

The present invention relates to, for example, a hydraulic crane driving device for driving a hydraulic crane used for transporting materials to a high place.

For example, Patent Document 1 describes a crawler type hydraulic crane as a hydraulic crane used for transporting materials to a high place. This hydraulic crane can be used as a mobile hydraulic crane (crane specification) and as a tower type hydraulic crane (tower specification) according to the specifications of the front attachment.

In this case, the hydraulic crane of Patent Document 1 merges the "pipeline connecting the first hydraulic pump and the auxiliary winding motor" and the "pipeline connecting the second hydraulic pump and the auxiliary winding motor". .. When used as a mobile hydraulic crane, the auxiliary winding motor is driven by the pressure oil from the second hydraulic pump to raise and lower the auxiliary hook. On the other hand, when it is used as a tower type hydraulic crane, the auxiliary winding motor is driven by the pressure oil from the first hydraulic pump to raise and lower the jib. As a result, the hoisting winch and the undulating winch can be driven by different pumps, and pressure interference can be suppressed.

Japanese Unexamined Patent Publication No. 2016-102017

Since the hydraulic crane of Patent Document 1 joins the "pipeline connecting the first hydraulic pump and the auxiliary winding motor" and the "pipeline connecting the second hydraulic pump and the auxiliary winding motor", the first It is necessary to prevent the pressure oil of the first hydraulic pump from flowing back into the hydraulic circuit of the second hydraulic pump and the pressure oil of the second hydraulic pump from flowing back into the hydraulic circuit of the first hydraulic pump. There is. Therefore, in Patent Document 1, the symbol at the neutral position of the auxiliary winding first control valve provided between the first hydraulic pump and the auxiliary winding motor is blocked, and the second hydraulic pump and the auxiliary winding motor are used. The symbol at the neutral position of the supplementary winding second control valve provided between and is used as a block.

As a result, in the case of the technique of Patent Document 1, it is essential to arrange the supplementary winding first control valve at the most downstream of the series circuit of the first hydraulic pump, and the supplementary winding second control valve is placed on the second hydraulic pump. It is essential to place it at the most downstream of the series circuit. That is, the technique of Patent Document 1 limits the degree of freedom in the arrangement of the supplementary winding first control valve and the supplementary winding second control valve. In addition, there is a possibility that the manufacturing cost will increase due to the need for a merging pipeline.

An object of the present invention is to provide a hydraulic crane drive device capable of improving the degree of freedom in arranging a control valve (directional control valve) and suppressing manufacturing costs.

In order to solve the above-mentioned problems, the present invention includes a first hydraulic pump, an undulating hydraulic motor driven by pressure oil supplied from the first hydraulic pump, the first hydraulic pump, and the above. An undulating directional control valve that switches the supply and discharge of pressure oil to the undulating hydraulic motor between the undulating hydraulic motor, an undulating operating device that operates the undulating directional control valve, and the first hydraulic pump. Between a second hydraulic pump different from the above, a main winding hydraulic motor driven by the pressure oil supplied from the second hydraulic pump, and the second hydraulic pump and the main winding hydraulic motor. It is supplied from the main winding directional control valve that switches the supply and discharge of pressure oil to the main winding hydraulic motor, the main winding operating device that operates the main winding directional control valve, and the first hydraulic pump. A jib undulation / auxiliary winding hydraulic motor driven by one of the pressure oil and the pressure oil supplied from the second hydraulic pump, and the first hydraulic pump and the jib undulation / A jib undulation direction control valve that switches the supply and discharge of pressure oil to the jib undulation / auxiliary winding hydraulic motor between the auxiliary winding hydraulic motor, the second hydraulic pump, and the jib undulating / auxiliary winding hydraulic pressure. Of the auxiliary winding directional control valve for switching the supply and discharge of pressure oil to the jib undulating and auxiliary winding hydraulic motor between the motor, and the jib undulating directional control valve and the auxiliary winding directional control valve. In a hydraulic crane drive device including a jib undulation / auxiliary winding operating device for operating either one of the directional control valves, the jib undulating / auxiliary winding operating device, the jib undulating directional control valve, and the auxiliary winding are provided. Whether to supply the pilot pressure corresponding to the operation of the jib undulation and auxiliary winding operation device to the jib undulating directional control valve or the auxiliary winding directional control valve with the directional control valve. It is characterized in that an operation circuit switching valve for switching is provided.

According to the present invention, the degree of freedom in arranging the directional control valve can be improved, and the manufacturing cost can be suppressed.

That is, according to the present invention, by switching the operation circuit switching valve, the pilot pressure supply destination from the jib undulation / auxiliary winding operation device can be selected from the jib undulating direction control valve and the auxiliary winding directional control valve. It is possible to switch to either one of. In this case, as in Patent Document 1 described above, "a pipeline connecting the first hydraulic pump and the jib undulating / auxiliary winding hydraulic motor" and "the second hydraulic pump and the jib undulating / auxiliary winding hydraulic motor". It is not necessary to merge with the "pipeline connecting the two". Therefore, the merging pipeline becomes unnecessary, and the manufacturing cost can be suppressed. Further, it is possible to improve the degree of freedom in arranging the directional control valve for auxiliary winding and the directional control valve for jib undulation. Moreover, by using the operation circuit switching valve as a manual switching valve, the certainty of switching of the pilot circuit can be improved.

It is a front view which shows the mobile hydraulic crane which mounted the hydraulic crane drive device by embodiment of this invention. It is a hydraulic circuit diagram of the mobile hydraulic crane in FIG. It is a front view which shows the tower type hydraulic crane which mounted the hydraulic crane drive device by embodiment of this invention. It is a hydraulic circuit diagram of the tower type hydraulic crane in FIG.

Hereinafter, the case where the hydraulic crane drive device according to the embodiment of the present invention is applied to a crawler type hydraulic crane will be described in detail with reference to the accompanying drawings.

1 to 4 show embodiments of the present invention. Here, FIGS. 1 and 2 show a case where the hydraulic crane 1 is used as a mobile hydraulic crane (crane specification). On the other hand, FIGS. 3 and 4 show a case where the hydraulic crane 1 is used as a tower type hydraulic crane (tower specification).

That is, the hydraulic crane 1 of the embodiment can be used as the mobile hydraulic crane 1 as shown in FIGS. 1 and 2 according to the specifications of the front attachments 7A and 7B, and can be used in FIGS. 3 and 4. It can be used as a tower type hydraulic crane 1 as shown in. In other words, the hydraulic crane 1 can select (replace) the front attachments 7A and 7B according to the work site, work content, and the like.

In FIGS. 1 and 3, the hydraulic crane 1 is provided on a self-propelled crawler-type lower traveling body 2, an upper rotating body 3 rotatably mounted on the lower traveling body 2, and a front side of the upper rotating body 3. It is configured to include front attachments 7A and 7B that are undulatingly attached. The hydraulic crane 1 performs the suspension work by using the main hook 20 (FIG. 1) suspended from the tip of the front attachment 7A or the hook 34 (FIG. 3) suspended from the tip of the front attachment 7B. It is a thing.

Here, the lower traveling body 2 and the upper swinging body 3 are used in both the case of the mobile hydraulic crane 1 and the case of the tower type hydraulic crane 1. Further, the backstop 13 and the mast 14, which will be described later, are also used in both the case of the mobile hydraulic crane 1 and the case of the tower type hydraulic crane 1. On the other hand, the front attachments 7A and 7B have different configurations depending on the crane specification (FIG. 1) and the tower specification (FIG. 2).

That is, the front attachment 7A of the mobile hydraulic crane 1 shown in FIG. 1 (hereinafter, also referred to as a crane attachment 7A) is mainly composed of a boom 8. On the other hand, the front attachment 7B (hereinafter, also referred to as tower attachment 7B) of the tower type hydraulic crane 1 shown in FIG. 3 is mainly composed of a boom 21 and a jib 24.

In this case, the lower boom 8A of the boom 8 of FIG. 1 and the lower boom 21A of the boom 21 of FIG. 3 are used for both the crane and the tower. That is, in FIGS. 1 and 3, the booms 8 and 21 and the lower booms 8A and 21A are designated by different reference numerals, but have the same configuration. In other words, the crane attachment 7A and the tower attachment 7B have a configuration in which the upper side of the booms 8 and 21 above the lower booms 8A and 21A is different between the crane and the tower.

The lower traveling body 2 is provided on the track frame 2A, the drive wheels 2B provided on the left and right sides of the track frame 2A, and the drive wheels 2B on the left and right sides of the track frame 2A on opposite sides in the front and rear directions. It is composed of the idle wheel 2C, the drive wheel 2B, and the track 2D wound around the idle wheel 2C. The left and right drive wheels 2B are rotationally driven by the left and right traveling hydraulic motors 2E and 2F (see FIGS. 2 and 4).

The upper swing body 3 constitutes the crane main body of the hydraulic crane 1, and has a swing frame 4 extending in the front and rear directions. A boom support bracket 4A is provided on the front side of the swivel frame 4 at intermediate portions in the left and right directions. Further, a gantry support bracket 4B is provided on the rear side of the swivel frame 4 with respect to the boom support bracket 4A. Further, a backstop support bracket 4C is provided on the rear side of the swivel frame 4 with respect to the gantry support bracket 4B.

On the rear side of the swivel frame 4, left and right counterweights 5 (shown only on the right side) for balancing the weight of the front attachments 7A and 7B and the suspended load are arranged at intervals in the left and right directions. In this case, the left and right counterweights 5 can be increased or decreased according to, for example, the front attachments 7A and 7B and the suspended load.

A lower boom spreader 16 (FIG. 1) and a boom undulating winch 17 (FIG. 1) are arranged between the left and right counterweights 5 so as to be separated from each other in the front and rear. On the other hand, the cab 6 is arranged on the right front side of the turning frame 4 (on the right side of the front attachments 7A and 7B). The driver's cab in the cab 6 includes a driver's seat (not shown), various operating devices 64, 65, 66, 67, 68 (see FIGS. 2 and 4), an input device 75 (see FIGS. 2 and 4), and the like. Have been placed.

Next, the crane attachment 7A shown in FIG. 1 will be described. The crane attachment 7A includes a boom 8 undulatingly attached to a swivel frame 4 of the upper swivel body 3. The boom 8 is composed of a lower boom 8A and an upper boom 8B connected to the tip of the lower boom 8A. The lower boom 8A is used in both the crane attachment 7A and the tower attachment 7B, together with the main winding winch 11 and the jib undulating and auxiliary winding winch 12.

The base end side of the lower boom 8A is undulatingly attached to the boom support bracket 4A of the swivel frame 4 by pin coupling. A backstop support bracket 8C is provided on the tip side of the lower boom 8A. Further, on the lower boom 8A, a main winding winch 11 and a jib undulating and auxiliary winding winch 12 used as an auxiliary winding winch are mounted side by side in the length direction.

On the other hand, sheave brackets 8D and 8E are provided at the tip of the upper boom 8B. A guide sheave 9 is rotatably attached to the sheave bracket 8D, and a point sheave 10 is rotatably attached to the sheave bracket 8E. In the guide sheave 9 and the point sheave 10, the main winding rope 19 is wound around.

The main winding winch 11 constitutes a main winding rope winch that winds up and unwinds the main winding rope 19. The main winding winch 11 includes a main winding drum 11A and a main winding hydraulic motor 11B (see FIGS. 2 and 4). In the main winding winch 11, the main winding drum 11A is rotated (forward rotation, reverse rotation) by the main winding hydraulic motor 11B, and the main winding rope 19 is wound and unwound to raise and lower the main hook 20.

The jib undulating and supplementary winding winch 12 constitutes a supplementary winding rope winch that winds and unwinds a supplementary winding rope (not shown) in the case of a crane specification, and the jib undulating rope 29 in the case of a tower specification. (Fig. 3) is wound up and unwound to form a rope winch for undulating jib. The jib undulation / supplementary winding winch 12 includes a jib undulation / supplementary winding drum 12A and a jib undulation / supplementary winding hydraulic motor 12B (see FIGS. 2 and 4).

When the jib undulation / supplementary winding winch 12 is a crane specification, the jib undulation / supplementary winding drum 12A is rotated (forward rotation, reverse rotation) by the jib undulation / supplementary winding hydraulic motor 12B, and the supplementary winding rope is wound and wound. The auxiliary hook (not shown) can be raised and lowered by pulling it out. On the other hand, as shown in FIG. 3, in the case of the tower specification, the jib undulation / supplementary winding winch 12 rotates (forward rotation, reverse rotation) the jib undulation / supplementary winding drum 12A by the jib undulation / supplementary winding hydraulic motor 12B. , The jib undulating rope 29 (the jib winding rope 29A) is wound up and unwound to undulate the jib 24.

The backstop 13 is provided between the swivel frame 4 and the boom 8. That is, the base end side of the backstop 13 is attached to the backstop support bracket 4C of the swivel frame 4. The tip end side of the backstop 13 is attached to the backstop support bracket 8C of the lower boom 8A. The backstop 13 expands and contracts according to the undulation angle of the boom 8, and when the boom 8 stands up substantially perpendicular to the ground, the backstop 13 supports the upright boom 8 from behind.

The mast 14 is provided on the swivel frame 4 so as to be rotatable in the front and rear directions. That is, the base end side of the mast 14 is rotatably attached to the gantry support bracket 4B of the swivel frame 4 by pin coupling. The tip 14A of the mast 14 is a free end that can rotate forward and backward with respect to the swivel frame 4. The tip 14A of the mast 14 is provided with a boom upper spreader 15 having a plurality of sheaves.

On the other hand, on the rear side of the swivel frame 4, a boom lower spreader 16 and a boom undulating winch 17 are provided between the left and right counterweights 5. The boom lower spreader 16 has a plurality of sheaves corresponding to each sheave of the boom upper spreader 15.

The boom undulating winch 17 constitutes a boom undulating rope winch that winds up and unwinds the boom undulating rope 18. The boom undulating winch 17 includes a boom undulating drum 17A as an undulating drum and a boom undulating hydraulic motor 17B (see FIGS. 2 and 4) as an undulating hydraulic motor. The boom undulation winch 17 turns by rotating (forward rotation, reverse rotation) the boom undulation drum 17A by the boom undulation hydraulic motor 17B, and winding and unwinding the boom undulation rope 18 (boom winding rope 18A). The boom 8 is raised and lowered with respect to the frame 4.

The boom undulating rope 18 is composed of a boom winding rope 18A and a boom pendant rope 18B. One end of the boom winding rope 18A is wound around the boom undulating drum 17A of the boom undulating winch 17, and the other end is wound around each sheave of the boom upper spreader 15 and each sheave of the boom lower spreader 16. There is. One end of the boom pendant rope 18B is connected to the tip 14A of the mast 14, and the other end is connected to the sheave bracket 8D of the upper boom 8B.

Therefore, when the boom winding rope 18A of the boom undulating rope 18 is wound by the boom undulating winch 17, the boom upper spreader 15 approaches the boom lower spreader 16 and the tip 14A of the mast 14 is rearward (counterweight 5). Rotate to the side). On the other hand, when the boom winding rope 18A of the boom undulating rope 18 is unwound from the boom undulating winch 17, the upper boom spreader 15 is separated from the lower boom spreader 16 and the tip 14A of the mast 14 is forward (cab 6 side). ). In this way, the boom 8 winds up and unwinds the boom winding rope 18A of the boom undulating rope 18 by the boom undulating winch 17, so that the boom 8 is centered on the base end side of the boom 8 with respect to the ground. It can undulate between a posture that is tilted at a relatively small angle and a posture that stands almost perpendicular to the ground.

One end of the main winding rope 19 is wound around the main winding drum 11A of the main winding winch 11. The other end side of the main winding rope 19 is wound around the guide sheave 9 and the point sheave 10 provided on the tip end side of the upper boom 8B, and then attached to the main hook 20 for suspension. Therefore, the main hook 20 can be raised and lowered by winding and unwinding the main winding rope 19 with the main winding winch 11.

Next, the tower attachment 7B shown in FIG. 3 will be described. The configuration of the tower attachment 7B will be mainly described as being different from the crane attachment 7A. Further, in FIG. 3, the members (same members) used in both the tower attachment 7B and the crane attachment 7A are designated by the same reference numerals except for the lower boom 21A.

The tower attachment 7B includes a boom 21 (hereinafter, also referred to as a tower boom 21), a jib 24 (hereinafter, also referred to as a tower jib 24), and a tower strut 27.

The tower boom 21 is undulatingly attached to the upper swing body 3. The tower boom 21 is connected to a lower boom 21A whose base end side is undulatingly attached to the boom support bracket 4A of the swivel frame 4 and a plurality of stages, for example, three stages whose base end is attached to the tip of the lower boom 21A. It is composed of an intermediate boom 21B and an upper boom 21C provided at the tip of the intermediate boom 21B located on the most distal side of the three-stage intermediate boom 21B.

On the lower boom 21A of the tower boom 21, a main winding winch 11 and a jib undulating and auxiliary winding winch 12 used as a jib undulating winch are mounted side by side in the length direction. This point is the same as the lower boom 8A of the boom 8 of the crane attachment 7A.

On the other hand, the upper boom 21C has a rhombic shape in which the upper portion protrudes forward in the standing posture of the tower boom 21 (the posture shown in FIG. 3), and the lower side portion is attached to the tip of the intermediate boom 21B. A tower jib 24 is undulatingly attached to the front side of the upper boom 21C (the front side in an upright posture). A tower strut 27 is swingably attached to a corner portion on the rear side (rear side in an upright state) of the upper boom 21C. Further, a triangular sheave bracket 21D is attached to the rear side of the upper boom 21C. The tower guide sheave 22 and the top sheave 23 are rotatably attached to the sheave bracket 21D.

The tower jib 24 is attached to the tip of the upper boom 21C constituting the tower boom 21. The tower jib 24 includes a lower jib 24A whose base end is undulatingly attached to the upper boom 21C, an intermediate jib 24B whose base end is attached to the tip of the lower jib 24A, and an upper jib 24B provided at the tip of the intermediate jib 24B. It is composed of 24C. A guide sheave 25 and a point sheave 26 are rotatably attached to the tip end side of the upper jib 24C. The guide sheave 25 and the point sheave 26 are such that the main winding rope 33 is wound around.

The tower strut 27 is swingably attached to the upper boom 21C constituting the tower boom 21. The tower strut 27 is configured as a triangular structure by connecting three struts 27A, 27B, 27C by three connecting portions 27D, 27E, 27F.

The tip side jib pendant rope 28 constitutes a pendant rope that connects the tower strut 27 and the tower jib 24. In this case, one end of the tip side jib pendant rope 28 is connected to the connecting portion 27E of the tower strut 27, and the other end is connected to the tip side of the upper jib 24C of the tower jib 24.

The jib undulating rope 29 is wound around the jib undulating and supplementary winding winch 12, and its tip is connected to the connecting portion 27F of the tower strut 27. The jib undulating rope 29 undulates the tower jib 24 with respect to the tower boom 21 via the tower strut 27.

The jib undulating rope 29 is composed of a jib winding rope 29A and a base end side jib pendant rope 29B. One end of the jib winding rope 29A is wound around the jib undulating and auxiliary winding drum 12A of the jib undulating and auxiliary winding winch 12. The other end of the jib winding rope 29A is wound around each sheave of the jib upper spreader 30 and each sheave of the jib lower spreader 31. In this case, the jib lower spreader 31 is attached to the intermediate boom 8B of the tower boom 21 and has a plurality of sheaves. The jib upper spreader 30 is provided so as to face the jib lower spreader 31 and has a plurality of sheaves. One end of the base end side jib pendant rope 29B is connected to the jib upper spreader 30, and the other end is connected to the connecting portion 27F of the tower strut 27.

Therefore, by winding the jib undulating rope 29 (the jib winding rope 29A) with the jib undulating and supplementary winding winch 12, the tip end side of the tower jib 24 can be raised upward with respect to the tower boom 21. Further, by unwinding the jib undulating rope 29 (the jib winding rope 29A) by the jib undulating and supplementary winding winch 12, the tip end side of the tower jib 24 can be laid down with respect to the tower boom 21.

The boom undulating rope 32 is composed of a boom winding rope 32A and a boom pendant rope 32B. One end of the boom winding rope 32A is wound around a boom undulating winch 17 (not shown in FIG. 3; see FIG. 1) and a boom undulating drum 17A (not shown in FIG. 3; see FIG. 1), and the other end. The side is wound around each sheave of the upper boom spreader 15 and each sheave of the lower boom spreader 16 (not shown in FIG. 3, see FIG. 1). One end of the boom pendant rope 32B is connected to the tip 14A of the mast 14, and the other end is connected to the upper boom 21C of the tower boom 21.

Therefore, by winding the boom winding rope 32A of the boom undulating rope 32 with the boom undulating winch 17, the tip end side of the tower boom 21 can be raised upward with the base end side of the tower boom 21 as the center. Further, by unwinding the boom winding rope 32A of the boom undulating rope 32 by the boom undulating winch 17, the tip end side of the tower boom 21 can be laid down to the ground side centering on the base end side of the tower boom 21. ..

One end of the main winding rope 33 is wound around the main winding drum 11A of the main winding winch 11. The other end of the main winding rope 33 is attached to the hook 34 via the top sheave 23 of the tower boom 21 (sheave bracket 21D), the guide sheave 25 of the tower jib 24, and the point sheave 26. Therefore, the hook 34 can be raised and lowered according to the winding and unwinding of the main winding rope 33 by the main winding winch 11.

Next, the hydraulic circuit 41 of the hydraulic crane 1 will be described with reference to FIGS. 2 and 4. Here, FIG. 2 shows a hydraulic circuit when the crane attachment 7A is attached to the upper swing body 3. In this case, the jib undulating and auxiliary winding hydraulic motor 12B is used as, for example, an auxiliary winding hydraulic motor for raising and lowering the auxiliary hook. On the other hand, FIG. 4 shows a hydraulic circuit when the tower attachment 7B is attached to the upper swing body 3. In this case, the jib undulating and supplementary winding hydraulic motor 12B is used as a jib undulating hydraulic motor for undulating the tower jib 24.

In the hydraulic circuit 41 of the hydraulic crane 1, the pressure oil is supplied by the first hydraulic circuit 42 to which the pressure oil is supplied by the first hydraulic pump 44 and the second hydraulic pump 48 different from the first hydraulic pump 44. It includes a second hydraulic circuit 43 to be supplied. In addition to the above-mentioned left traveling hydraulic motor 2E and boom undulating hydraulic motor 17B, the first hydraulic circuit 42 includes a first hydraulic pump 44, a left traveling directional control valve 51, and jib undulating directional control. It includes a valve 60 and a boom undulating directional control valve 53 as an undulating directional control valve. In the second hydraulic circuit 43, in addition to the above-mentioned right traveling hydraulic motor 2F and main winding hydraulic motor 11B, the second hydraulic pump 48, right traveling directional control valve 52, and auxiliary winding directional control The valve 58 and the main winding directional control valve 55 are included. In this case, the hydraulic pumps 44, 48 and the control valves 51, 52, 53, 55, 58, 60 are mounted on the upper swing body 3. Further, a hydraulic oil tank 45, a pilot hydraulic pump 62, an operation circuit switching valve 69, a control device 76, etc., which will be described later, are also mounted on the upper swing body 3.

Here, in the case of the crane specifications shown in FIG. 1, as shown in FIG. 2, the jib undulating and auxiliary winding hydraulic motor 12B is connected to the second hydraulic circuit 43 via the auxiliary winding direction control valve 58. To. On the other hand, in the case of the tower specification shown in FIG. 3, as shown in FIG. 4, the jib undulation / auxiliary winding hydraulic motor 12B is connected to the first hydraulic circuit 42 via the jib undulation direction control valve 60. Be connected. Therefore, the jib undulation / auxiliary winding hydraulic motor 12B constitutes the first hydraulic circuit 42 and the second hydraulic circuit 43.

The first hydraulic pump 44 supplies pressure oil to the left traveling hydraulic motor 2E, the jib undulating / auxiliary winding hydraulic motor 12B, and the boom undulating hydraulic motor 17B as the undulating hydraulic motor. The first hydraulic pump 44 discharges the hydraulic oil stored in the hydraulic oil tank 45 as pressure oil. The first hydraulic pump 44 supplies the hydraulic oil to the left traveling hydraulic motor 2E, the jib undulating / auxiliary winding hydraulic motor 12B, and the boom undulating hydraulic motor 17B together with the hydraulic oil tank 45 for storing the hydraulic oil. It constitutes a first hydraulic source for the purpose.

The first hydraulic pump 44 is rotationally driven by, for example, an engine (not shown) which is a drive source (rotation source) mounted on the upper swing body 3. The engine rotationally drives a second hydraulic pump 48 and a pilot hydraulic pump 62 in addition to the first hydraulic pump 44. The drive source for driving the hydraulic pumps 44, 48, 62 may be composed of an engine alone as an internal combustion engine, or may be composed of, for example, an engine and an electric motor, or an electric motor alone. Further, the hydraulic pumps 44, 48, 62 may be driven by separate drive sources.

The first hydraulic pump 44 discharges pressure oil into the first discharge pipe line 46. In this case, the first discharge pipe 46 connects the left traveling directional control valve 51, the jib undulating directional control valve 60, and the boom undulating directional control valve 53 in series. That is, the left traveling directional control valve 51, the jib undulating directional control valve 60, and the boom undulating directional control valve 53 are connected in series to the first hydraulic pump 44 in order from the upstream side. As a result, the first hydraulic circuit 42 is the first for supplying pressure oil to the left traveling hydraulic motor 2E, the boom undulating hydraulic motor 17B, and the jib undulating / auxiliary winding hydraulic motor 12B as needed. It is a series circuit of.

The first hydraulic circuit 42 is provided with a first main relief valve 47 located between the first discharge pipe line 46 and the hydraulic oil tank 45. The first main relief valve 47 opens when the pressure in the first discharge pipe 46 exceeds a predetermined pressure (set pressure) to relieve the excess pressure to the hydraulic oil tank 45 side. That is, the maximum pressure of the pressure oil supplied from the first hydraulic pump 44 is defined by the first main relief valve 47.

On the other hand, the second hydraulic pump 48 of the second hydraulic circuit 43 is provided separately from the first hydraulic pump 44. The second hydraulic pump 48 supplies pressure oil to the right traveling hydraulic motor 2F, the jib undulation / auxiliary winding hydraulic motor 12B, and the main winding hydraulic motor 11B. The second hydraulic pump 48 discharges the hydraulic oil stored in the hydraulic oil tank 45 as pressure oil. The second hydraulic pump 48 supplies the hydraulic oil to the right traveling hydraulic motor 2F, the jib undulation / auxiliary winding hydraulic motor 12B, and the main winding hydraulic motor 11B together with the hydraulic oil tank 45 for storing the hydraulic oil. It constitutes a second hydraulic source for the purpose.

Similar to the first hydraulic pump 44, the second hydraulic pump 48 is rotationally driven by an engine serving as a drive source (rotation source). The second hydraulic pump 48 discharges pressure oil into the second discharge pipe line 49. In this case, the second discharge line 49 connects the right traveling directional control valve 52, the auxiliary winding directional control valve 58, and the main winding directional control valve 55 in series. That is, the right traveling directional control valve 52, the auxiliary winding directional control valve 58, and the main winding directional control valve 55 are connected in series to the second hydraulic pump 48 in order from the upstream side. As a result, the second hydraulic circuit 43 is a second for supplying pressure oil to the right traveling hydraulic motor 2F, the main winding hydraulic motor 11B, and the jib undulating / auxiliary winding hydraulic motor 12B as needed. It is a series circuit of.

The second hydraulic circuit 43 is provided with a second main relief valve 50 located between the second discharge pipe line 49 and the hydraulic oil tank 45. The second main relief valve 50 is opened when the pressure in the second discharge pipe line 49 exceeds a predetermined pressure (set pressure) to relieve the excess pressure to the hydraulic oil tank 45 side. That is, the maximum pressure of the pressure oil supplied from the second hydraulic pump 48 is defined by the second main relief valve 50.

The left traveling hydraulic motor 2E of the first hydraulic circuit 42 drives the left track 2D of the lower traveling body 2. The left travel hydraulic motor 2E is supplied with pressure oil from the first hydraulic pump 44 via the left travel direction control valve 51. That is, the left traveling hydraulic motor 2E is driven by the pressure oil supplied from the first hydraulic pump 44.

The left traveling directional control valve 51 is a pilot-operated directional control valve. That is, the left traveling directional control valve 51 is composed of, for example, a hydraulic pilot type directional control valve at 6 ports and 3 positions. The left traveling direction control valve 51 switches and controls the pressure oil supplied from the first hydraulic pump 44 to the left traveling hydraulic motor 2E. That is, the left traveling direction control valve 51 switches the supply and discharge of the pressure oil to the left traveling hydraulic motor 2E between the first hydraulic pump 44 and the left traveling hydraulic motor 2E. A pilot pressure (switching signal) based on the operation of the left travel operation device 64 is supplied to the hydraulic pilot units 51A and 51B of the left travel direction control valve 51.

The right traveling hydraulic motor 2F of the second hydraulic circuit 43 drives the right crawler belt of the lower traveling body 2. The pressure oil from the second hydraulic pump 48 is supplied to the right traveling hydraulic motor 2F via the right traveling directional control valve 52. That is, the right traveling hydraulic motor 2F is driven by the pressure oil supplied from the second hydraulic pump 48.

The right traveling directional control valve 52 is a pilot-operated directional control valve like the left traveling directional control valve 51. That is, the directional control valve 52 for traveling to the right is composed of, for example, a hydraulic pilot type directional control valve at 6 ports and 3 positions. The right traveling direction control valve 52 switches and controls the pressure oil supplied from the second hydraulic pump 48 to the right traveling hydraulic motor 2F. That is, the right traveling direction control valve 52 switches the supply and discharge of pressure oil to the right traveling hydraulic motor 2F between the second hydraulic pump 48 and the right traveling hydraulic motor 2F. The pilot pressure (switching signal) based on the operation of the right traveling operation device 66 is supplied to the hydraulic pilot units 52A and 52B of the right traveling direction control valve 52.

The boom undulating hydraulic motor 17B of the first hydraulic circuit 42 drives the boom undulating drum 17A of the boom undulating winch 17. Pressure oil from the first hydraulic pump 44 is supplied to the boom undulating hydraulic motor 17B via the boom undulating direction control valve 53. That is, the boom undulating hydraulic motor 17B is driven by the pressure oil supplied from the first hydraulic pump 44.

The boom undulating directional control valve 53 is a pilot-operated directional control valve. That is, the boom undulating directional control valve 53 is composed of, for example, a hydraulic pilot type directional control valve at 6 ports and 3 positions. The boom undulating direction control valve 53 switches and controls the pressure oil supplied from the first hydraulic pump 44 to the boom undulating hydraulic motor 17B. That is, the boom undulating direction control valve 53 switches the supply and discharge of pressure oil to the boom undulating hydraulic motor 17B between the first hydraulic pump 44 and the boom undulating hydraulic motor 17B. Pilot pressure (switching signal) based on the operation of the boom undulation operation device 65 is supplied to the hydraulic pilot units 53A and 53B of the boom undulation direction control valve 53.

The boom undulating direction control valve 53 and the boom undulating hydraulic motor 17B are connected to the hydraulic oil tank 45 via a boom undulating detour pipe 54. A boom undulating relief valve 54A and a boom undulating check valve 54B are provided in parallel in the boom undulating detour pipe 54.

The main winding hydraulic motor 11B of the second hydraulic circuit 43 drives the main winding drum 11A of the main winding winch 11. The pressure oil from the second hydraulic pump 48 is supplied to the main winding hydraulic motor 11B via the main winding directional control valve 55. That is, the main winding hydraulic motor 11B is driven by the pressure oil supplied from the second hydraulic pump 48.

The main winding directional control valve 55 is a pilot-operated directional control valve. That is, the main winding directional control valve 55 is composed of, for example, a hydraulic pilot type directional control valve at 6 ports and 3 positions. The main winding directional control valve 55 switches and controls the pressure oil supplied from the second hydraulic pump 48 to the main winding hydraulic motor 11B. That is, the main winding directional control valve 55 switches the supply and discharge of pressure oil to the main winding hydraulic motor 11B between the second hydraulic pump 48 and the main winding hydraulic motor 11B. Pilot pressure (switching signal) based on the operation of the main winding operating device 67 is supplied to the hydraulic pilot units 55A and 55B of the main winding directional control valve 55.

The main winding directional control valve 55 and the main winding hydraulic motor 11B are connected to the hydraulic oil tank 45 via a main winding detour pipe 56. The main winding detour pipe 56 is provided with a main winding relief valve 56A and a main winding check valve 56B in parallel.

The jib undulation / supplementary winding hydraulic motor 12B drives the jib undulation / supplementary winding drum 12A of the jib undulation / supplementary winding winch 12. In the case of the crane specifications shown in FIG. 2, the jib undulating and auxiliary winding hydraulic motor 12B is connected to the auxiliary winding directional control valve 58 via the jib undulating and auxiliary winding pipelines 57A and 57B. In this case, the oil pressure oil from the second hydraulic pump 48 is applied to the jib undulating / auxiliary winding hydraulic motor 12B via the auxiliary winding direction control valve 58 and the jib undulating / auxiliary winding pipelines 57A and 57B. Will be supplied.

The auxiliary winding directional control valve 58 is a pilot-operated directional control valve. That is, the auxiliary winding directional control valve 58 is composed of, for example, a hydraulic pilot type directional control valve at 6 ports and 3 positions. The auxiliary winding direction control valve 58 switches and controls the pressure oil supplied from the second hydraulic pump 48 to the jib undulating and auxiliary winding hydraulic motor 12B, which is the auxiliary winding hydraulic motor. That is, the auxiliary winding direction control valve 58 switches the supply and discharge of pressure oil to the jib undulating and auxiliary winding hydraulic motor 12B between the second hydraulic pump 48 and the jib undulating and auxiliary winding hydraulic motor 12B. The pilot pressure (switching signal) based on the operation of the jib undulating and auxiliary winding operation device 68 is supplied to the hydraulic pilot portions 58A and 58B of the auxiliary winding direction control valve 58.

The auxiliary winding direction control valve 58 and the jib undulating / auxiliary winding hydraulic motor 12B are connected to the hydraulic oil tank 45 via the auxiliary winding detour pipe line 59. A supplementary winding relief valve 59A and a supplementary winding check valve 59B are provided in parallel in the supplementary winding detour line 59.

On the other hand, in the case of the tower specification shown in FIG. 4, the jib undulating / auxiliary winding hydraulic motor 12B is connected to the jib undulating direction control valve 60 via the jib undulating / auxiliary winding pipelines 57A and 57B. In this case, the pressure oil from the first hydraulic pump 44 is applied to the jib undulating / auxiliary winding hydraulic motor 12B via the jib undulating direction control valve 60 and the jib undulating / auxiliary winding pipelines 57A and 57B. Will be supplied.

As described above, the jib undulating and auxiliary winding pipelines 57A and 57B are connected to the auxiliary winding directional control valve 58 in the case of the crane specification and connected to the jib undulating direction control valve 60 in the case of the tower specification. To As a result, the jib undulating and auxiliary winding hydraulic motor 12B is driven by the pressure oil of either the pressure oil supplied from the first hydraulic pump 44 or the pressure oil supplied from the second hydraulic pump 48. Driven.

The jib undulating directional control valve 60 is a pilot-operated directional control valve. That is, the jib undulating directional control valve 60 is composed of, for example, a hydraulic pilot type directional control valve at 6 ports and 3 positions. The jib undulation direction control valve 60 switches and controls the pressure oil supplied from the first hydraulic pump 44 to the jib undulation / auxiliary winding hydraulic motor 12B, which is the jib undulation hydraulic motor. That is, the jib undulation direction control valve 60 switches the supply and discharge of pressure oil to the jib undulation / auxiliary winding hydraulic motor 12B between the first hydraulic pump 44 and the jib undulating / auxiliary winding hydraulic motor 12B. Pilot pressure (switching signal) based on the operation of the jib undulation / auxiliary winding operation device 68 is supplied to the hydraulic pilot units 60A and 60B of the jib undulation direction control valve 60.

The jib undulation direction control valve 60 and the jib undulation / auxiliary winding hydraulic motor 12B are connected to the hydraulic oil tank 45 via a jib undulation detour pipe 61. A jib undulation relief valve 61A and a jib undulation check valve 61B are provided in parallel in the jib undulation detour pipe 61.

The pilot hydraulic pump 62 is rotationally driven by an engine serving as a drive source (rotation source), similarly to the first hydraulic pump 44 and the second hydraulic pump 48. The pilot hydraulic pump 62 discharges the hydraulic oil stored in the hydraulic oil tank 45 into the pilot discharge pipe 63 as pressure oil. That is, the pilot hydraulic pump 62 constitutes the pilot hydraulic source together with the hydraulic oil tank 45. The pilot hydraulic pump 62 supplies the pilot pressure to the directional control valves 51, 52, 53, 55, 58, 60 via the operating devices 64, 65, 66, 67, 68.

The left traveling operation device 64, the boom undulating operation device 65, the right traveling operation device 66, the main winding operation device 67, and the jib undulation / auxiliary winding operation device 68 are lever-type pressure reducing valve type pilot valves, respectively. (That is, a lever operating device). The left travel operation device 64 outputs pilot pressure oil (that is, pilot pressure) having a pressure corresponding to the lever operation amount to the hydraulic pilot units 51A and 51B of the left travel direction control valve 51. As a result, the left traveling operation device 64 operates the left traveling direction control valve 51. The boom undulation operation device 65 as the undulation operation device outputs the pilot pressure according to the lever operation amount to the hydraulic pilot units 53A and 53B of the boom undulation direction control valve 53. As a result, the boom undulating operation device 65 operates the boom undulating direction control valve 53.

The right-handed operation device 66 outputs the pilot pressure according to the lever operation amount to the hydraulic pilot units 52A and 52B of the right-handed directional control valve 52. As a result, the right traveling operation device 66 operates the right traveling direction control valve 52. The main winding operation device 67 outputs the pilot pressure according to the lever operation amount to the hydraulic pilot units 55A and 55B of the main winding directional control valve 55. As a result, the main winding operating device 67 operates the main winding directional control valve 55.

The jib undulating and auxiliary winding operation device 68 applies the pilot pressure according to the lever operation amount to the auxiliary winding directional control valve 58 and the jib via the operation circuit switching valve 69 and the electromagnetic switching valves 70, 71, 72, 73. The output is output to the hydraulic pilot units 58A, 58B (60A, 60B) of the directional control valve 58 (60) of either one of the undulating directional control valve 60. That is, in the case of the crane specifications shown in FIG. 2, the pilot pressure of the jib undulating and auxiliary winding operation device 68 is supplied to the auxiliary winding directional control valve 58 via the operation circuit switching valve 69 and the electromagnetic switching valves 70 and 71. Will be done. On the other hand, in the case of the tower specification shown in FIG. 4, the pilot pressure of the jib undulation / auxiliary winding operation device 68 is a jib undulation direction control valve via the operation circuit switching valve 69 and the electromagnetic switching valves 72 and 73. Supplied to 60. As a result, the jib undulating and auxiliary winding operation device 68 operates the directional control valve of either the jib undulating directional control valve 60 or the auxiliary winding directional control valve 58.

The operation circuit switching valve 69 is a manual switching valve and can be switched by the operation lever 69A. The operation circuit switching valve 69 has two switching positions, a position corresponding to the "crane mode (moving crane mode)" and a position corresponding to the "tower mode (tower crane mode)". That is, the operation circuit switching valve 69 is switched to either the "crane mode" position shown in FIG. 2 or the "tower mode" position shown in FIG. 4 by manually operating the operation lever 69A.

Here, the operation circuit switching valve 69 is provided between the jib undulating and auxiliary winding operation device 68, the jib undulating directional control valve 60, and the auxiliary winding directional control valve 58. The operation circuit switching valve 69 switches whether to supply the pilot pressure corresponding to the operation of the jib undulation / auxiliary winding operation device 68 to the jib undulating directional control valve 60 or the auxiliary winding directional control valve 58.

That is, when the operation circuit switching valve 69 is switched to the “crane mode” position shown in FIG. 2 by the operation lever 69A, the jib undulation / auxiliary winding operation device 68 is changed to the auxiliary winding directional control valve 58 (hydraulic pressure). It is connected to the pilot units 58A and 58B). In this case, the jib undulating and auxiliary winding operation device 68 is connected to the auxiliary winding directional control valve 58 (hydraulic pilot portions 58A, 58B) via the operation circuit switching valve 69 and the electromagnetic switching valves 70, 71.

On the other hand, when the operation circuit switching valve 69 is switched to the position of the "tower mode" shown in FIG. It is connected to the pilot units 60A and 60B). In this case, the jib undulation / auxiliary winding operation device 68 is connected to the jib undulation direction control valve 60 (hydraulic pilot units 60A, 60B) via the operation circuit switching valve 69 and the electromagnetic switching valves 72, 73.

The solenoid switching valves 70, 71, 72, and 73 are all on / off solenoid valves (for example, solenoid solenoid type switching valves at 3 ports and 2 positions). The electromagnetic switching valves 70, 71, 72, and 73 are connected to the control device 76 as a controller, respectively. The electromagnetic switching valves 70, 71, 72, and 73 are turned on and off by the control device 76.

The first auxiliary winding electromagnetic switching valve 70 is provided between the operation circuit switching valve 69 and the (first) hydraulic pilot portion 58A of the auxiliary winding directional control valve 58. The first auxiliary winding electromagnetic switching valve 70 cuts off between the open position (on position) that communicates between the operation circuit switching valve 69 and the hydraulic pilot portion 58A of the auxiliary winding directional control valve 58, and between them. It is switched to the closed position (off position). That is, the first auxiliary winding electromagnetic switching valve 70 is in the closed position shown in FIG. 2, that is, the operation circuit when power is not supplied (powered) from the control device 76 to the electromagnetic pilot unit (solenoid). It is an off position (off position for connecting the hydraulic pilot portion 58A and the hydraulic oil tank 45) for cutting off the connection between the switching valve 69 and the hydraulic pilot portion 58A of the auxiliary winding direction control valve 58. On the other hand, when the power is supplied (powered) from the control device 76 to the electromagnetic pilot unit (solenoid), the first auxiliary winding electromagnetic switching valve 70 is in the open position, that is, the operation circuit switching valve 69. This is the on position for connecting the auxiliary winding direction control valve 58 to the hydraulic pilot portion 58A.

The second auxiliary winding electromagnetic switching valve 71 is provided between the operation circuit switching valve 69 and the (second) hydraulic pilot portion 58B of the auxiliary winding directional control valve 58. The second auxiliary winding electromagnetic switching valve 71 cuts off between the open position (on position) that communicates between the operation circuit switching valve 69 and the hydraulic pilot portion 58B of the auxiliary winding directional control valve 58, and between them. It is switched to the closed position (off position). That is, the second auxiliary winding electromagnetic switching valve 71 is in the closed position shown in FIG. 2, that is, the operation circuit when power is not supplied (powered) from the control device 76 to the electromagnetic pilot unit (solenoid). It is an off position (off position for connecting the hydraulic pilot portion 58B and the hydraulic oil tank 45) for cutting off the connection between the switching valve 69 and the hydraulic pilot portion 58B of the auxiliary winding direction control valve 58. On the other hand, when the power is supplied (powered) from the control device 76 to the electromagnetic pilot unit (solenoid), the second auxiliary winding electromagnetic switching valve 71 is in the open position, that is, the operation circuit switching valve 69. This is the on position for connecting the auxiliary winding directional control valve 58 to the hydraulic pilot portion 58B.

The first jib undulation electromagnetic switching valve 72 is provided between the operation circuit switching valve 69 and the (first) hydraulic pilot portion 60A of the jib undulation direction control valve 60. The first jib undulation electromagnetic switching valve 72 cuts off between the open position (on position) that communicates between the operation circuit switching valve 69 and the hydraulic pilot portion 60A of the jib undulation direction control valve 60. It is switched to the closed position (off position). That is, the first jib undulating electromagnetic switching valve 72 is in the closed position shown in FIG. 2, that is, the operation circuit when power is not supplied (powered) from the control device 76 to the electromagnetic pilot unit (solenoid). It is an off position (off position for connecting the hydraulic pilot unit 60A and the hydraulic oil tank 45) for cutting off the connection between the switching valve 69 and the hydraulic pilot unit 60A of the jib undulating direction control valve 60. On the other hand, the first jib undulating electromagnetic switching valve 72 is in the open position, that is, the operation circuit switching valve 69 when power is supplied (powered) from the control device 76 to the electromagnetic pilot unit (solenoid). This is the on position for connecting the jib undulating direction control valve 60 to the hydraulic pilot unit 60A.

The second jib undulating electromagnetic switching valve 73 is provided between the operation circuit switching valve 69 and the (second) hydraulic pilot portion 60B of the jib undulating directional control valve 60. The second jib undulation electromagnetic switching valve 73 cuts off between the open position (on position) that communicates between the operation circuit switching valve 69 and the hydraulic pilot portion 60B of the jib undulation direction control valve 60, and between them. It is switched to the closed position (off position). That is, the second jib undulating electromagnetic switching valve 73 is in the closed position shown in FIG. 2, that is, the operation circuit when power is not supplied (powered) from the control device 76 to the electromagnetic pilot unit (solenoid). It is an off position (off position for connecting the hydraulic pilot unit 60B and the hydraulic oil tank 45) for cutting off the connection between the switching valve 69 and the hydraulic pilot unit 60B of the jib undulating direction control valve 60. On the other hand, the second jib undulating electromagnetic switching valve 73 is in the open position, that is, the operation circuit switching valve 69 when power is supplied (powered) from the control device 76 to the electromagnetic pilot unit (solenoid). This is the on position for connecting the jib undulating direction control valve 60 to the hydraulic pilot portion 60B.

The position sensor 74 is provided on the operation circuit switching valve 69. The position sensor 74 is connected to the control device 76. The position sensor 74 detects the switching position of the operation circuit switching valve 69 (that is, whether it is a position corresponding to the “crane mode” or a position corresponding to the “tower mode”), and a signal corresponding to the switching position. Is output to the control device 76.

The input device 75 is connected to the control device 76. The input device 75 is provided in the vicinity of the driver's seat in the cab 6. The input device 75 sets the moment limiter and the like. For this purpose, the input device 75 is configured to include, for example, a monitor for displaying setting items, selection items, and the like, and various operation switches for making various settings based on the display of the monitor. Further, the input device 75 is a notification device that notifies the operator of information by including, for example, a monitor, an indicator lamp, a warning lamp, a buzzer that serves as an audio device, and the like.

Here, the input device 75 sets the working mode of the hydraulic crane 1, that is, the working mode of the jib undulating / auxiliary winding hydraulic motor 12B to either a jib undulating mode (tower mode) or a supplementary winding mode (crane mode). A mode selection switch for selecting is configured. That is, the operator can set the working mode of the hydraulic crane 1 to, for example, either "crane mode" or "tower mode" by operating the input device 75. In other words, the operator can set the work mode of the hydraulic crane 1 to a desired work mode by operating the input device 75 and appropriately selecting the work mode.

The control device 76 is a controller that switches between the jib undulating electromagnetic switching valves 72 and 73 and the auxiliary winding electromagnetic switching valves 70 and 71. The control device 76 includes, for example, a microcomputer, a drive circuit, a power supply circuit, and the like. The control device 76 is connected to the jib undulating electromagnetic switching valves 72 and 73 (solenoid) and the auxiliary winding electromagnetic switching valves 70 and 71 (solenoid). Further, the control device 76 is connected to the input device 75. Further, power is supplied to the control device 76 from a battery (not shown) that serves as a power source mounted on the upper swing body 3.

The control device 76 switches the jib undulating electromagnetic switching valves 72 and 73 and the auxiliary winding electromagnetic switching valves 70 and 71 according to the switching position of the operation circuit switching valve 69. In this case, the control device 76 has the jib undulating electromagnetic switching valves 72 and 73 and the auxiliary winding electromagnetic switching valve 70 according to the switching position detected by the position sensor 74 and the working mode selected by the input device 75. , 71 is switched.

That is, in the control device 76, when the crane specifications are shown in FIG. 2, the switching position of the operation circuit switching valve 69 detected by the position sensor 74 is a position corresponding to the “crane mode”, and the input device 75 When the selected working mode is the "crane mode", power is supplied to the auxiliary winding electromagnetic switching valves 70 and 71. As a result, the control device 76 is set to the open position by exciting the auxiliary winding electromagnetic switching valves 70 and 71. As a result, it is permitted that the pilot pressure of the jib undulating and auxiliary winding operation device 68 is supplied to the auxiliary winding directional control valve 58 (hydraulic pilot portions 58A, 58B).

On the other hand, in the control device 76, when the tower specifications are shown in FIG. 4, the switching position of the operation circuit switching valve 69 detected by the position sensor 74 is a position corresponding to the “tower mode”, and the input device 75 When the selected working mode is "tower mode", power is supplied to the jib undulating electromagnetic switching valves 72 and 73. As a result, the control device 76 is set to the open position by exciting the jib undulating electromagnetic switching valves 72 and 73. As a result, it is permitted that the pilot pressure from the jib undulation / auxiliary winding operation device 68 is supplied to the jib undulation direction control valve 60 (hydraulic pilot portions 60A, 60B).

On the other hand, in the control device 76, when the switching position of the operation circuit switching valve 69 detected by the position sensor 74 and the working mode selected by the input device 75 do not match, the electromagnetic switching valves 70, 71, 72 , 73 is not supplied with power. As a result, the control device 76 is set to the closed position by degaussing the electromagnetic switching valves 70, 71, 72, 73. As a result, the pilot pressure from the jib undulating and auxiliary winding operating device 68 is applied to the auxiliary winding directional control valve 58 (hydraulic pilot portions 58A, 58B) and the jib undulating directional control valve 60 (hydraulic pilot portions 60A, 60B). Is prohibited from being supplied to.

The hydraulic crane 1 according to the present embodiment has the above-described configuration, and the operation of the hydraulic crane 1 will be described next.

As shown in FIGS. 1 and 2, when the suspension work is performed using the flood control crane 1 of the crane specifications, the boom undulation rope 18 is wound by the boom undulation winch 17, and the boom undulation rope 18 is swiveled as shown in FIG. 1, for example. The boom 8 is raised upward with respect to the frame 4. When the angle of the boom 8 is determined, the main winding drum 11A is rotated by the main winding hydraulic motor 11B of the main winding winch 11. As a result, the main winding rope 19 can be wound and unwound on the main winding drum 11A, and the main hook 20 can be raised and lowered, and a suspended load such as a material suspended from the main hook 20 can be placed between the ground and a high place. Can be transported by. Further, the auxiliary winding rope (not shown) is wound and unwound by rotating the jib undulating and auxiliary winding drum 12A by the jib undulating and auxiliary winding hydraulic motor 12B of the jib undulating and auxiliary winding winch 12. The auxiliary hook (not shown) can also be raised and lowered.

On the other hand, as shown in FIGS. 3 and 4, when the suspension work is performed using the tower-specification hydraulic crane 1, the boom undulation rope 32 is wound by the boom undulation winch 17, for example, as shown in FIG. , The tower boom 21 is raised upward with respect to the turning frame 4. Further, by winding the jib undulating rope 29 with the jib undulating and supplementary winding winch 12, the tip side of the tower jib 24 can be raised upward with respect to the tower boom 21. After the angle of the tower jib 24 is determined, the main winding drum 11A is rotated by the main winding hydraulic motor 11B of the main winding winch 11. As a result, the main winding rope 33 can be wound up and unwound on the main winding drum 11A, and the hook 34 can be raised and lowered, and the suspended load such as materials suspended on the hook 34 can be transported between the ground and a high place. can do.

Here, in the embodiment, the pilot pressure of the jib undulation / auxiliary winding operation device 68 is used for jib undulation by the switching position of the operation circuit switching valve 69 and the switching position of the electromagnetic switching valves 70, 71, 72, 73. It is switched whether to supply to the directional control valve 60 or the auxiliary winding directional control valve 58. In this case, as shown in FIG. 2, in the case of the crane specification, the jib undulation / auxiliary winding pipelines 57A and 57B are provided between the jib undulating / auxiliary winding hydraulic motor 12B and the auxiliary winding directional control valve 58. Connecting. That is, in this case, one end side of the jib undulating and auxiliary winding pipelines 57A and 57B (that is, the side opposite to the jib undulating and auxiliary winding hydraulic motor 12B) is connected to the auxiliary winding direction control valve 58.

On the other hand, in the case of the tower specification, the jib undulating and auxiliary winding pipelines 57A and 57B connect between the jib undulating and auxiliary winding hydraulic motor 12B and the jib undulating direction control valve 60. That is, in this case, one end side of the jib undulating and supplementary winding pipelines 57A and 57B (that is, the side opposite to the jib undulating and supplementary winding hydraulic motor 12B) is connected to the jib undulating direction control valve 60. As described above, in the embodiment, according to the specifications of the front attachments 7A and 7B (that is, the working mode of the crane according to the front attachments 7A and 7B), the jib undulation and auxiliary winding pipes 57A and 57B are connected to one end side. The tip (the connection destination of the hoses constituting the jib undulating and auxiliary winding pipelines 57A and 57B) is switched (recombined).

The connection work on one end side of the jib undulating and supplementary winding pipelines 57A and 57B is performed, for example, at a work site. That is, the hydraulic crane 1 is transported to the work site in a disassembled state. Then, at the work site, for example, as shown in FIG. 1, the crane attachment 7A is attached to the upper swing body 3. At this time, as shown in FIG. 2, one end side of the jib undulating and auxiliary winding pipelines 57A and 57B is connected to the auxiliary winding direction control valve 58 side. On the other hand, as shown in FIG. 3, when the tower attachment 7B is attached to the upper swivel body 3, as shown in FIG. 4, one end side of the jib undulating and supplementary winding pipelines 57A and 57B is controlled in the direction of jib undulation. Connect to the valve 60 side.

Here, in the embodiment, which of the first hydraulic pump 44 and the second hydraulic pump 48 is used as the supply source of the pressure oil supplied to the jib undulating / auxiliary winding hydraulic motor 12B is determined. It is determined as follows according to the work mode to be set. That is, in the embodiment, the operator of the hydraulic crane 1 can set the working mode to either "crane mode" or "tower mode" by using the input device 75. In this case, the control device 76 controls the electromagnetic switching valves 70, 71, 72, 73 according to the set work mode. That is, the input device 75 and the control device 76 constitute a work mode setting device for the operator to set the work mode of the crane.

Here, the "crane mode" is a mode selected when the load is lifted by the main winding winch 11 or the jib undulating and auxiliary winding winch 12 as the auxiliary winding winch. When the control device 76 is set to the "crane mode", the solenoids of the jib undulating electromagnetic switching valves 72 and 73 are degaussed, and the solenoids of the auxiliary winding electromagnetic switching valves 70 and 71 are excited. At this time, by operating the operation lever 69A of the operation circuit switching valve 69 to the position shown in FIG. 2, that is, the position corresponding to the "crane mode", the pilot pressure of the jib undulation / auxiliary winding operation device 68 is supplemented. It is supplied to the winding direction control valve 58. Further, the jib undulating and auxiliary winding pipelines 57A and 57B connect the jib undulating and auxiliary winding hydraulic motor 12B and the auxiliary winding directional control valve 58. That is, one end side of the jib undulating and auxiliary winding pipelines 57A and 57B is connected to the auxiliary winding direction control valve 58. As a result, the pressure oil from the second hydraulic pump 48 is supplied to the jib undulating and auxiliary winding hydraulic motor 12B via the auxiliary winding directional control valve 58.

In such a "crane mode", when the load is lifted by the jib undulation / auxiliary winding winch 12, the boom undulation hydraulic motor 17B for driving the boom undulation drum 17A of the boom undulation winch 17 has a first hydraulic pressure. Pressure oil is supplied from the pump 44. On the other hand, pressure oil is supplied from the second hydraulic pump 48 to the jib undulation and supplementary winding hydraulic motor 12B that drives the jib undulation and supplementary winding drum 12A of the jib undulation and supplementary winding winch 12 used as the supplementary winding winch. To. Therefore, it is possible to prevent pressure interference between the boom undulating hydraulic motor 17B and the jib undulating / auxiliary winding hydraulic motor 12B.

On the other hand, the "tower mode" is a mode selected when the hydraulic crane 1 is used as a tower crane. When the control device 76 is set to the "tower mode", the solenoids of the auxiliary winding electromagnetic switching valves 70 and 71 are degaussed, and the solenoids of the jib undulating electromagnetic switching valves 72 and 73 are excited. At this time, by operating the operation lever 69A of the operation circuit switching valve 69 to the position shown in FIG. 4, that is, the position corresponding to the "tower mode", the pilot pressure of the jib undulation / auxiliary winding operation device 68 is jib. It is supplied to the undulating direction control valve 60. Further, the jib undulating and auxiliary winding pipelines 57A and 57B connect the jib undulating and auxiliary winding hydraulic motor 12B and the jib undulating direction control valve 60. That is, one end side of the jib undulating and supplementary winding pipelines 57A and 57B is connected to the jib undulating direction control valve 60. As a result, the pressure oil from the first hydraulic pump 44 is supplied to the jib undulation / auxiliary winding hydraulic motor 12B via the jib undulation direction control valve 60.

In such a "tower mode", when the load is lifted by the main winding winch 11, the jib undulation and auxiliary winding winch 12 used as the jib undulating winch 12 is driven by the jib undulating and auxiliary winding drum 12A. Pressure oil is supplied to the winding hydraulic motor 12B from the first hydraulic pump 44. On the other hand, pressure oil is supplied from the second hydraulic pump 48 to the main winding hydraulic motor 11B that drives the main winding drum 11A of the main winding winch 11. Therefore, it is possible to prevent pressure interference between the jib undulating / auxiliary winding hydraulic motor 12B and the main winding hydraulic motor 11B.

As described above, the pilot pressure of the jib undulation / auxiliary winding operation device 68 is controlled by the switching position of the operation circuit switching valve 69 and the switching position of the electromagnetic switching valves 70, 71, 72, 73. It is switched whether to supply to 60 or the auxiliary winding direction control valve 58. In this case, a position sensor 74 serving as an operation position detector is attached to the operation lever 69A of the operation circuit switching valve 69. The position sensor 74 detects whether the operation circuit switching valve 69 is operated to supply the pilot pressure to the jib undulating direction control valve 60 or the auxiliary winding direction control valve 58.

For example, consider a case where the operating lever 69A is operated in the "tower mode" and the operator sets the working mode to the "crane mode" by the input device 75. In this case, the operation circuit switching valve 69 allows (permits) to supply the pilot pressure of the jib undulation / auxiliary winding operation device 68 to the jib undulation direction control valve 60. However, since the control device 76 degausses the solenoids of the jib undulation electromagnetic switching valves 72 and 73, the pilot pressure of the jib undulation / auxiliary winding operation device 68 is not supplied to the jib undulation direction control valve 60. At this time, the control device 76 notifies the operator that the jib undulation / auxiliary winding winch 12 does not operate normally by displaying an error on the monitor of the input device 75, for example.

On the other hand, consider a case where the operating lever 69A is operated in the "crane mode" and the operator sets the working mode to the "tower mode" by the input device 75. In this case, the operation circuit switching valve 69 allows (permits) the pilot pressure of the jib undulating and auxiliary winding operation device 68 to be supplied to the auxiliary winding directional control valve 58. However, since the control device 76 degausses the solenoids of the auxiliary winding electromagnetic switching valves 70 and 71, the pilot pressure of the jib undulating and auxiliary winding operation device 68 is not supplied to the auxiliary winding directional control valve 58. At this time, the control device 76 notifies the operator that the jib undulation / auxiliary winding winch 12 does not operate normally by displaying an error on the monitor of the input device 75, for example. As a result, it is possible to achieve both reliable hydraulic change switching that is not affected by detection abnormalities and prevention of artificial switching errors.

As described above, in the embodiment, by switching the operation circuit switching valve 69, the supply destination of the pilot pressure from the jib undulation / auxiliary winding operation device 68 is controlled by the jib undulating direction control valve 60 and the auxiliary winding direction control. It is possible to switch to either one of the valve 58. In this case, as in Patent Document 1 described above, "a pipeline connecting the first hydraulic pump and the jib undulating / auxiliary winding hydraulic motor" and "the second hydraulic pump and the jib undulating / auxiliary winding hydraulic motor". It is not necessary to merge with the "pipeline connecting the two". Therefore, the merging pipeline becomes unnecessary, and the manufacturing cost can be suppressed. Further, it is not necessary to arrange the auxiliary winding directional control valve 58 and the jib undulating directional control valve 60 at the most downstream of the series circuit, and the degree of freedom of arrangement can be improved. Moreover, since the operation circuit switching valve 69 is a manual switching valve, the certainty of switching of the pilot circuit can be improved.

Further, the jib undulation / auxiliary winding hydraulic motor 12B is provided on the lower booms 8A and 21A of the booms 8 and 21. On the other hand, the hydraulic crane 1 is transported to the work site in a disassembled state. Therefore, when assembling the hydraulic crane 1 at the work site, both when the hydraulic crane 1 is used in the crane specification and in the tower specification, one end side of the jib undulating and auxiliary winding pipelines 57A and 57B (that is, that is). The work of connecting the jib undulation / auxiliary winding hydraulic motor 12B) to the upper swing body 3 side is performed. Therefore, even if the merging pipe is not provided, by changing the connection of the jib undulating and supplementary winding pipes 57A and 57B, pressure oil is applied to the jib undulating and supplementary winding hydraulic motor 12B so that pressure interference does not occur. Can be supplied.

In the embodiment, the jib undulation electromagnetic switching valves 72 and 73 that are switched between the open position and the jib undulating directional control valve 60 between the operation circuit switching valve 69 and the jib undulation direction control valve 60, the operation circuit switching valve 69 and the auxiliary winding It is provided with auxiliary winding electromagnetic switching valves 70 and 71 that can be switched between an open position and a closed position with the directional control valve 58. Then, the open position and the closed position of the jib undulating electromagnetic switching valves 72 and 73 and the auxiliary winding electromagnetic switching valves 70 and 71 are switched by the control device 76 as a controller. Therefore, the supply destination of the pilot pressure from the jib undulation / auxiliary winding operation device 68 can be determined by both the operation circuit switching valve 69 and the control device 76. Thereby, the certainty of switching of the pilot circuit can be further improved.

In the embodiment, the operation circuit switching valve 69 is a manual switching valve, and the control device 76 includes a position sensor 74 for detecting the switching position of the operation circuit switching valve 69, and an input device constituting a mode selection switch. 75 is connected. Then, the control device 76 includes the jib undulating electromagnetic switching valves 72 and 73 and the auxiliary winding electromagnetic switching valves 70 and 71 according to the switching position detected by the position sensor 74 and the working mode selected by the input device 75. To switch. Therefore, the pilot circuit can be reliably switched by manually operating the operation circuit switching valve 69.

In addition to this, the control device 76 can determine the consistency between the switching position of the operation circuit switching valve 69 and the working mode selected by the input device 75. That is, when the switching position of the operation circuit switching valve 69 and the working mode selected by the input device 75 match, the control device 76 applies the pilot pressure from the jib undulation / auxiliary winding operation device 68 to that mode and It can be supplied to a control valve (jib undulating directional control valve 60 or auxiliary winding directional control valve 58) required at the switching position. As a result, it is possible to prevent the hydraulic crane 1 from being erroneously operated in a state where the switching position of the operation circuit switching valve 69 and the working mode selected by the input device 75 do not match.

In the embodiment, a case where the main winding winch 11 and the jib undulating and auxiliary winding winch 12 are provided on the lower booms 8A and 21A of the booms 8 and 21 will be described as an example. However, the present invention is not limited to this, and for example, one or both of the main winding winch 11 and the jib undulating / auxiliary winding winch 12 may be provided on the upper swing body 3.

In the embodiment, a case where the left traveling directional control valve 51, the jib undulating directional control valve 60, and the boom undulating directional control valve 53 are connected in series to the first hydraulic pump 44 in this order from the upstream side is taken as an example. I explained. However, the present invention is not limited to this, and for example, a series connection may be made to the first hydraulic pump in the order of the left traveling directional control valve, the boom undulating directional control valve, and the jib undulating directional control valve from the upstream side.

In the embodiment, a case where the right traveling directional control valve 52, the auxiliary winding directional control valve 58, and the main winding directional control valve 55 are connected in series to the second hydraulic pump 48 in this order from the upstream side is taken as an example. I explained. However, the present invention is not limited to this, and for example, a series connection may be made to the second hydraulic pump in the order of the right traveling directional control valve, the main winding directional control valve, and the auxiliary winding directional control valve from the upstream side.

1 Flood Crane 7A Crane Attachment (Front Attachment)
7B Tower Attachment (Front Attachment)
11B Main winding hydraulic motor 12B Jib undulating and auxiliary winding hydraulic motor 17B Boom undulating hydraulic motor (undulating hydraulic motor)
44 First hydraulic pump 48 Second hydraulic pump 53 Boom undulating directional control valve (undulating directional control valve)
55 Main winding directional control valve 58 Supplementary winding directional control valve 60 Jib undulation directional control valve 65 Boom undulation operation device (undulation operation device)
67 Main winding operation device 68 Jib undulation and auxiliary winding operation device 69 Operation circuit switching valve 70 First auxiliary winding electromagnetic switching valve (auxiliary winding electromagnetic switching valve)
71 Second auxiliary winding electromagnetic switching valve (auxiliary winding electromagnetic switching valve)
72 First jib undulation electromagnetic switching valve (jib undulating electromagnetic switching valve)
73 Second jib undulating electromagnetic switching valve (jib undulating electromagnetic switching valve)
74 Position sensor 75 Input device (mode selection switch)
76 Controller

Claims (3)

The first hydraulic pump and
An undulating hydraulic motor driven by the pressure oil supplied from the first hydraulic pump, and
An undulating direction control valve for switching between supply and discharge of pressure oil to the undulating hydraulic motor between the first hydraulic pump and the undulating hydraulic motor.
An undulation operation device that operates the undulation direction control valve,
A second hydraulic pump different from the first hydraulic pump,
The main winding hydraulic motor driven by the pressure oil supplied from the second hydraulic pump,
A main winding directional control valve that switches the supply and discharge of pressure oil to the main winding hydraulic motor between the second hydraulic pump and the main winding hydraulic motor.
A main winding operating device that operates the main winding directional control valve,
A jib undulation / auxiliary winding hydraulic motor driven by one of the pressure oil supplied from the first hydraulic pump and the pressure oil supplied from the second hydraulic pump.
A jib undulation direction control valve for switching between supply and discharge of pressure oil to the jib undulation / auxiliary winding hydraulic motor between the first hydraulic pump and the jib undulation / auxiliary winding hydraulic motor.
An auxiliary winding direction control valve that switches the supply and discharge of pressure oil to the jib undulating and auxiliary winding hydraulic motor between the second hydraulic pump and the jib undulating and auxiliary winding hydraulic motor.
In a hydraulic crane drive device including a jib undulation / auxiliary winding operation device for operating one of the jib undulating directional control valve and the auxiliary winding directional control valve.
A pilot pressure corresponding to the operation of the jib undulation / auxiliary winding operating device is applied between the jib undulating / auxiliary winding operating device, the jib undulating directional control valve, and the auxiliary winding directional control valve. A hydraulic crane drive device characterized in that an operation circuit switching valve for switching between supplying to the jib undulating directional control valve and supplying to the auxiliary winding directional control valve is provided. An electromagnetic switching valve for jib undulation, which is provided between the operation circuit switching valve and the directional control valve for jib undulation and is switched between an open position communicating between them and a closed position blocking between them.
An electromagnetic switching valve for auxiliary winding, which is provided between the operation circuit switching valve and the directional control valve for auxiliary winding and is switched between an open position for communicating between them and a closed position for blocking between them.
A controller that is connected to the jib undulating electromagnetic switching valve and the auxiliary winding electromagnetic switching valve and switches the jib undulating electromagnetic switching valve and the auxiliary winding electromagnetic switching valve according to the switching position of the operation circuit switching valve. The hydraulic crane drive device according to claim 1, further comprising. The operation circuit switching valve is a manual switching valve.
The operation circuit switching valve is provided with a position sensor that is connected to the controller and detects the switching position of the operation circuit switching valve.
A mode selection switch for selecting the working mode of the jib undulation / auxiliary winding hydraulic motor to either the jib undulating mode or the auxiliary winding mode is connected to the controller.
The controller is characterized in that the jib undulating electromagnetic switching valve and the auxiliary winding electromagnetic switching valve are switched according to the switching position detected by the position sensor and the working mode selected by the mode selection switch. The hydraulic crane drive device according to claim 2.

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