JP4939295B2 - Labor-saving grab work boat - Google Patents

Description

  The present invention relates to a labor-saving grab work ship, in particular, the weight of the grab bucket and a part or all of the weight of the grab bucket via a rope arranged between the weight and the grab bucket that can be moved up and down on the carriage. The present invention relates to a labor-saving grab work boat that can cancel out and save power for driving up and down the grab bucket.

  As a labor-saving grab work boat having the above-mentioned structure, for example, as shown in Patent Document 1, a work table mounted on a table boat so as to be able to swivel in a horizontal plane, and a sheave pivoted at the tip of the work table, which is pivotably supported by the work table. A freely supported boom, an elevating guide frame that is erected on one side of the work table, and a fixed pulley is pivotally supported on the upper part, and a movable pulley is pivotally supported by the elevating guide frame so as to be movable up and down. A weight for reducing the weight of the bucket, a grab bucket capable of gripping the sediment at the bottom of the water, one end side of which is attached to the grab bucket, and the other end side is wrapped around a moving pulley via a sheave and a fixed pulley, and the weight is There is known a type including a rope to be suspended, and a lifting means such as a lifting cylinder that is interposed between a weight and a work table or a lifting guide frame and extends in the vertical direction to lift the weight. ing.

Further, as shown in Patent Document 2, a boom that is pivotably supported by a workbench and that supports the first and second sheaves at the tip is rotatably mounted on one side of the workbench and fixed to the upper part. An elevating guide frame on which a pulley is pivotally supported, a weight for reducing the weight of a bucket that is guided by the elevating guide frame and is supported by a movable pulley, and a grab bucket capable of grasping sediment on the bottom of the water; A first rope having one end connected to the grab bucket and the other end connected to a winch on a work table or a lifting guide frame through the first sheave so that the grab bucket can be moved up and down; There is also known a type in which one end side is attached and the other end side is wound around a moving pulley via a second sheave and a fixed pulley, and a second rope that suspends a weight.
No. 3-12839 Japanese Patent Publication No. 60-53141

  In general, there are several types of grab buckets with different specifications according to the difference in the hardness of the earth and sand to be gripped and the difference in the amount of earth and sand held per bucket. It is beneficial to increase work efficiency if it is properly used according to the situation at the site. However, if the grab bucket is replaced with another bucket with different specifications, the bucket weight will change greatly with the replacement. May end up.

  However, in the conventional labor-saving grab work boat, the weight weight (that is, the total weight that the weight exerts on the rope) remains on the other end of the rope while the weight body that is suspended via the moving pulley is set on the rope. (Weight) could not be changed, so if the bucket weight is greatly changed as described above, the existing weight will not be able to cope with the changed bucket weight, and the power generated by the weight There is a possibility that the saving effect cannot be fully expected.

  Therefore, in the past, in order to cope with a large change in the bucket weight, it was necessary to replace the existing weight completely with a weight corresponding to the changed bucket weight, but the weight exchange work is troublesome. In addition, in order to cope with future changes in the bucket weight, it is necessary to prepare several large weights with different weights in advance, which causes problems such as complicated management and handling and increased costs. .

  The present invention has been made in view of such circumstances, and even if the weight of the bucket is greatly changed due to replacement of the grab bucket or the like, the existing weight body is still used (that is, replaced with another weight body). The weight-saving grab work vessel that can change the overall weight of the weight arbitrarily, so that the effect of reducing the power for driving the bucket by the weight can continue to be fully demonstrated, and all the problems of the prior art are solved at once. The purpose is to provide.

In order to achieve the above-mentioned object, the invention of claim 1 is characterized in that a boom pivotably supported by a work table mounted on a carriage and having a sheave supported rotatably at a tip thereof is provided on one side of the work table. a lift guide frame fixed sheave Rutotomoni top is set is axially supported, and the weight of the movable pulley is axially supported, capable and rotation and lateral movement impossible lifting the weight at a fixed position in the elevation guide frame Elevating and lowering guiding means for guiding to the grab, a grab bucket capable of gripping sediment at the bottom of the water, one end side of which is attached to the grab bucket, and the other end side is wound around the moving pulley through the sheave and the fixed pulley, and the weight is A rope that hangs a weight; and a lifting cylinder that is interposed between the weight and the work table or the lifting guide frame and extends in the vertical direction to lift the weight. Grab bucket with weight through the rope A labor glove work ship which is adapted to offset the weight and part or all, weight main body of the weight is left aligned on the left and right across the lifting cylinder, and a right side wall portion, the left, right side wall An upper wall part integrally connecting the upper ends of the parts, and an upper end part of the elevating cylinder is connected to the upper wall part, and a weight changing means capable of arbitrarily changing the entire weight of the weight, At least two weight pieces that can be placed one above the other vertically on the left and right sides of the lift cylinder, and a part or all of the weight pieces are placed vertically on the lower end of the left and right side wall portions. it consists of a binding means capable of binding detachably in a state superposed you characterized.

The invention according to claim 2 is a boom that is pivotally supported by a work table mounted on a trolley so that it can be raised and lowered, and a sheave is rotatably supported at the tip, and is erected on one side of the work table and fixed to the upper part. A lifting guide frame on which a pulley is pivotally supported, a weight on which a movable pulley is pivotally supported, and a lifting guide means for guiding the weight to the lifting guide frame so that it can be lifted and lowered and cannot be rotated and moved laterally. A grab bucket capable of gripping sediment at the bottom of the water, and a rope having one end bound to the grab bucket and the other end wound around the movable pulley via the sheave and the fixed pulley to suspend the weight A lifting cylinder interposed between the weight and the work table or the lifting guide frame and extending in the vertical direction to lift the weight, and the entire weight of the weight is passed through the cable The grab bucket weight and some or all phases The weight-saving grab work boat is constructed such that the weight main body of the weight is integrally formed between the left and right side walls arranged on the left and right sides of the lifting cylinder and the upper ends of the left and right side walls. An upper wall portion to be coupled, and an upper end portion of the elevating cylinder is connected to the upper wall portion, and weight changing means capable of arbitrarily changing the entire weight of the weight is provided on the left and right wall portions. constructed with each hollow form, and wherein the composed of a liquid capable reservoir tank unit for weight changes, and the liquid supply means to the tank, and the liquid discharge means from the tank portion To do.

As described above, according to the present invention, even if the bucket weight is largely changed due to replacement of the grab bucket or the like, the overall weight of the weight can be arbitrarily changed while the existing weight body is continuously used. The weight saving effect of the bucket drive power can continue to be fully demonstrated. In this case, the existing weight body can continue to be used and it is not necessary to replace it with another weight body. This simplifies and saves costs.

In particular, according to the invention of claim 1 , the weight changing means includes at least two weight pieces that can be placed one above the other on the carriage on the left and right sides of the lifting cylinder, and part of the weight pieces or Since it is composed of a coupling means that can be detachably coupled with the entire body vertically stacked on the left and right bottom walls of the weight body, a relatively small weight piece that is easy to manage and handle The total weight of the weight can be easily changed by preparing at least two and simply detaching the weight from the weight main body.

In particular, according to the invention of claim 2 , the weight changing means can store the liquid for changing the weight , which is formed by hollowing the left and right side walls of the weight body suspended from the rope. A tank unit, a liquid supply unit to the tank unit, and a liquid discharge unit from the tank unit, so that the total weight of the weight can be easily changed by supplying and discharging the liquid to the tank unit. Moreover, it can be performed continuously and finely.

  Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

In the accompanying drawings, FIGS. 1 to 5 show a first embodiment of the present invention, FIG. 1 is an overall view showing a labor-saving grab work boat, and FIG. 2 is a side view showing a weight changing means. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2, FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG. 2, and FIG. It is a disassembled perspective view which shows a part. 6 to 9 show a second embodiment of the present invention. FIG. 6 is a side view showing the weight changing means (corresponding to FIG. 2), and FIG. 7 is an enlarged view of line 7-7 in FIG. 8 is an enlarged sectional view taken along line 8-8 in FIG. 6, and FIG. 9 is a perspective view showing the main part of the weight changing means. 10 to 12 show a third embodiment of the present invention, in which FIG. 10 is an overall view showing a labor-saving grab work ship, and FIG. 11 is an enlarged view of part 11 of FIG. 10 (FIGS. 2 and 6). FIG. 12 is a sectional view taken along line 12-12 of FIG. Further, FIG. 13 is a view corresponding to FIG. 2 showing weight changing means according to the fourth embodiment, and FIG. 14 is an overall view showing a labor-saving grab work boat according to a reference example.

  First, in FIGS. 1 to 5 showing the first embodiment, a work table 2 is mounted so as to be able to swivel in a horizontal plane on a self-navigable carriage 1 of a labor-saving grab work ship. The boom B is pivotally supported so that it can be raised and lowered. The raising / lowering drive of the boom B is performed by the telescopic cylinder 3 interposed between the boom B and the work table 2, and a rope guide sheave S is rotatably supported at the tip of the boom B. .

  An intermediate portion of the rope A is wound around the sheave S, one end side of the rope A is suspended from the sheave S, and the terminal portion of the grab bucket G capable of gripping the sediment at the bottom of the water. The base is bound, and the bucket G can be suspended at the tip of the boom B via the rope A.

  The grab bucket G is configured by pivotally supporting a pair of left and right bucket claws Ga, Gb on a base frame Gm so that the bucket claws Ga, Gb can be opened and closed, and between each bucket pawl Ga, Gbb. A forced opening / closing device (not shown) is provided for each, and the forced opening / closing device can be remotely operated from the cab in the work table 2. Since the structure of the grab bucket G is the same as that of a conventionally known grab bucket, further explanation is omitted.

  On one side of the work table 2, an elevating guide frame 4 extending in the vertical direction is erected, and a fixed pulley 5 is rotatably supported at the center of the upper end of the elevating guide frame 4. A weight W for bucket weight reduction is guided to the lifting guide frame 4 so that the weight can be raised and lowered, and a movable pulley 6 is rotatable at the center of the upper end of the weight body Wm that forms the main part of the weight W. It is pivotally supported.

  In the illustrated example, the weight main body Wm is formed in a gate shape with left and right side wall portions 7a and 7b arranged in parallel with a distance from each other, and an upper wall portion 7c integrally connecting the upper ends of both side wall portions 7a and 7b. It is formed. Between the both outer side surfaces of the left and right side wall portions 7a and 7b and the left and right side frame portions of the lifting guide frame 4 corresponding to them, lifting guide means 8 for guiding the lifting and lowering of the weight W is provided.

  In the illustrated example, the lift guide means 8 is fixed to the lift guide frame 4 and extends in the vertical direction, and the weight main body Wm is slidably engaged with the guide rail 4g only in the vertical direction. Although it is composed of a plurality of fixed sliders 9, the structure is not limited to the illustrated example as long as the weight W can be guided up and down stably. For example, a rotating wheel (not shown) that can roll the guide rail 4g is rotatably supported on the slider 9, and the slider 9 is guided to the guide rail 4g through the rotating wheel. .

  The other end side of the rope A is wound around the movable pulley 6 through the sheave S and the fixed pulley 5, and the weight W is suspended in the lifting guide frame 4. The terminal portion on the other end side is bound 10 at an appropriate position on the upper end portion of the lifting guide frame 4. There may be at least one set of the movable pulley 6 and the fixed pulley 5, but when a plurality of sets are arranged side by side (in the arrangement on the transmission path) as shown in the drawing, the lifting stroke of the weight W is increased. Even if it is short, the lifting stroke of the grab bucket G can be secured sufficiently long.

  Between the upper end portion of the weight main body Wm and the work table 2 or the lifting guide frame 4, the left and right side wall portions 7a and 7b of the weight main body Wm extend in the vertical direction to force the weight W. An elevating cylinder CY that moves up and down is interposed, and this constitutes the elevating means of the present invention. The elevating cylinder CY is driven to extend by hydraulic pressure when, for example, the grab bucket G is lowered below the water surface, and is driven to contract by releasing the hydraulic pressure when the grab bucket G is raised. Depending on the set weight of the weight W, the elevating cylinder CY may be configured to be contracted by hydraulic pressure when the grab bucket G is raised.

  In the illustrated example, the elevating cylinder CY is formed of a telescopic multi-stage cylinder so as to ensure a sufficient elevating stroke of the weight W. However, a large number of sets of the movable pulley 6 and the fixed pulley 5 are provided. When the lifting stroke of the weight W is set to be relatively short, it is possible to use a single lifting cylinder.

  The above configuration is the same as the basic configuration of a conventionally known labor-saving grab work boat. In this embodiment, the entire weight of the weight W is further used while the weight main body Wm is continuously used (that is, set to the rope A). The weight changing means C that can arbitrarily change the entire weight of the weight W is equipped on the carrier 1 in the state where the weight is kept.

  The weight changing means C includes at least one (two in the illustrated example) weight adjusting weight piece W1, housed in the carriage 1 (in the illustrated example, the elevating guide frame 4 on the work table 2). W2 and a coupling means J capable of detachably coupling the weight pieces W1 and W2 to the weight body Wm suspended from the other end side of the rope A via the movable pulley 6 are provided.

  The coupling means J is configured so that a plurality of connecting rods 11 integrally extending downward at the lower ends of the left and right side wall portions 7a, 7b of the weight body Wm and the connecting rods 11 can be inserted and removed. A connection hole 12 formed in the weight pieces W1 and W2, and a connection that allows the weight pieces W1 and W2 to be inserted into the connection rod 11 in a skewered manner with the connection hole 12 inserted into the connection rod 11 and fastened. A bolt 13 and a nut 14 that can be screwed to the bolt 13 and are fixed to the weight pieces W1, W2 are configured. The weight pieces W1 and W2 and the connecting rod 11 are respectively formed with bolt holes 15 and 16 through which the connecting bolt 13 can be inserted. Thus, by connecting the necessary number of weight pieces W1, W2 to the connecting rod 11 (and hence the weight main body Wm) by the connecting bolt 13, the entire weight of the weight W can be changed arbitrarily and stepwise. It is.

  Next, the operation of the first embodiment will be described. In performing the work of collecting sediment from the bottom of the solid line in FIG. 1, first, the grab bucket G is held in an expanded state, and the lifting cylinder CY is extended to drive the weight W in the lifting guide frame 4. The rope A is fed out and the grab bucket G is gradually lowered. Then, when the grab bucket G reaches the bottom of the water, the bucket G is forcibly closed to forcibly lift up the sediment at the bottom of the water and grip it in the bucket G.

  Thereafter, the hydraulic pressure of the lifting cylinder CY is released or the cylinder CY is contracted to lower the weight W in the lifting guide frame 4 and pull the rope A together with the grab bucket G. In this case, since the weight of the weight W and the weight of the grab bucket G can be partially or completely offset, the power for driving up and down the grab bucket G can be saved, and the bucket G can be lifted and lowered smoothly. Can be made.

  By the way, the larger the overall weight of the weight W, the smaller the driving force required to lift the grab bucket G. However, on the other hand, the driving force required when the grab bucket G is lowered increases. The total weight should be selected as appropriate from the viewpoint of both raising and lowering of the grab bucket G so that the work efficiency is the highest and the power can be saved.

  In general, the grab bucket G has several types of buckets (not shown) with different specifications according to the difference in the hardness of the earth and sand to be gripped and the difference in the amount of earth and sand held per bucket. It is possible to improve the work efficiency by properly using them according to the situation at the dredging site. However, if the grab bucket G is replaced with another bucket with different specifications, the replacement is necessary. As a result, the bucket weight may be significantly changed.

  Therefore, in this embodiment, in order to cope with such a large change in the bucket weight, the weight changing means C described above (specifically, an appropriate number of weight pieces W1, W2 are coupled to the weight body Wm). The total weight of the weight W can be changed stepwise according to the bucket weight. When changing the weight, the existing weight body Wm can be used as it is (that is, it remains set on the rope A), and it is not necessary to replace it with another large weight body. Can be simplified and cost can be saved. Moreover, it is possible to easily change the overall weight of the weight W simply by preparing a plurality of relatively small weight pieces W1 and W2 that are easy to manage and handle and detaching them from the weight body Wm. it can.

Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, only the connecting means J 'between the weight body Wm and the weight pieces W1, W2 is different from the above embodiment, so only the difference will be described. The other components are denoted by the same reference numerals as the corresponding components in the first embodiment (the same applies to the following third and fourth embodiments).

  The coupling means J ′ of the second embodiment includes a lock claw mechanism 20 provided at each of the lower end portions of the left and right side wall portions 7a and 7b of the weight body Wm and the lower end portion of the upper weight piece W1, and its lock claw. In order to cooperate with the mechanism 20, it is constituted by a locking box 21 provided on the upper surface of the lower weight pieces W 1, W 2.

  Each lock claw mechanism 20 includes a box-shaped lock housing 20a fixed to the lower end portions of the left and right side wall portions 7a and 7b of the weight body Wm and the lower end portion of the upper weight piece W1, and the lock housing 20a. A lock claw 20b that is pivotally supported by the lower wall between the lock position and the unlock position and protrudes downward from the lower wall, and the lock claw 20b is interposed between the lock position and the lock release position. The drive device 20c is housed in the lock housing 20a for forced rotation, and the drive device 20c is configured by combining a parallel link mechanism 23 and a hydraulic cylinder 24 in the illustrated example.

  Further, on the upper wall of each locking box 21, a long hole-shaped locking hole 21a that can be engaged with and disengaged from the corresponding locking claw 20b is formed.

  Accordingly, the locking hole 21a of the locking box 21 is held between the lower ends of the left and right side wall portions 7a and 7b of the weight body Wm and the lower weight piece W1 while the lock claw 20b is held at the unlocked position. When the lock claw 20b is rotated to the lock position and locked to the opening edge of the lock hole 21a, the space between the weight body Wm and the weight piece W1 is increased. Combined. Similarly, between the upper weight piece W1 and the lower weight piece W2, the lock claw 20b is held in the unlocked position and inserted into the lock hole 21a of the lock box 21 and lowered. If the lock claw 20b is rotated to the lock position and locked in the locking hole 21a, the weight pieces W1 and W2 are connected. The unlocking may be performed in the reverse procedure.

  Thus, also in the second embodiment, the total weight of the weight W can be arbitrarily set by connecting the necessary number of weight pieces W1, W2 to the weight body Wm in series by the connecting means J '. Therefore, the same effect as that of the first embodiment can be expected.

  Next, a third embodiment of the present invention will be described with reference to FIGS. In this embodiment, since only the weight changing means C is different from the above embodiment, only the difference will be described.

  In other words, the weight changing means C of the third embodiment is provided in a weight body Wm suspended from the other end side of the rope A via the movable pulley 6 and can store water 34 for changing the weight. A hollow part 30 as a part, a water supply means 3I as a liquid supply means to the hollow part 30, and a drainage means 32 as a liquid discharge means from the hollow part 30.

  The weight body Wm having a gate shape is formed hollow so that at least a part of the weight main body Wm becomes a water storage tank, and the space portion of the hollow portion 30 located in the left and right side wall portions 7a and 7b is The bottoms communicate with each other through a communication pipe 33 that extends horizontally around the elevating cylinder CY.

  The water supply means 31 is configured to be able to take in water in the surrounding water area into the hollow portion 30, which includes a water conduit 31 a that communicates between the peripheral water area and the hollow portion 30 a, and the water conduit 31 a to each other. A joint 31b that can be connected / disconnected in series and an open / close valve 31c that can be opened and closed, and a pump 31d that forcibly pumps water from the surrounding water area into the water guide pipe 31a and pumps it to the hollow portion 30 are provided.

  Although not shown, a confirmation means for confirming the water surface level (and hence the adjustment weight) of the hollow portion 30, for example, a transparent monitor window for visually observing the water surface level, or a level sensor for detecting the water surface level, etc. Is attached to the weight main body Wm.

  The drainage means 32 is configured to be able to drain the water 34 stored in the hollow portion 30 to the surrounding water area, and includes a drain pipe 32a for communicating between the peripheral water area and the hollow portion 30a, The drain pipe 32a is provided with a connectable / disengageable joint 32b and a detachable on-off valve 32c provided in series with each other. The drainage by the drainage pipe 32a is performed by natural fall using gravity, but a forced drainage pump may be used as necessary.

  Each of the water guide pipe 31a and the drain pipe 32a has at least a part of flexibility so that they can follow the lifting and lowering operation of the weight body Wm without difficulty. Sufficient slack is given so that there is room even if it rises the highest.

  Thus, in this embodiment, the total weight of the weight W can be easily and continuously changed finely by supplying and discharging the liquid (water) to and from the hollow portion 30 of the weight main body Wm. There is. Moreover, in the illustrated example, the water supply means 31 can forcibly take the water in the surrounding water area into the hollow portion 30, and the drainage means 32 can discharge the water in the hollow portion 30 to the surrounding water area. Therefore, as the water 34 for changing the weight, the water in the water area around the site can be used as it is, so there is no need to store the water for changing the weight in the carriage 1 (outside the weight W). As a result, facilities can be simplified and costs can be reduced.

  The pump 31d may be a dedicated pump for changing the weight. However, the pump 31d may be a pump for other uses (for example, a cooling water pump for heavy machinery hydraulic cooling or engine cooling, By using the fire extinguishing pump in combination, the cost can be reduced.

  As a modified example of the third embodiment, for example, a liquid supply source that is separated and independent from the weight W, for example, a liquid storage tank (not shown) is provided inside or outside the carriage 1, and this liquid supply source is provided. The liquid (water) is supplied / discharged between the (storage tank) and the hollow portion 30 of the weight body Wm by the water supply means 31 as the liquid supply means and the drainage means 32 as the liquid discharge means. Things can be considered.

  FIG. 13 shows a fourth embodiment of the present invention. In this embodiment, the mounting position of the movable pulley 6 in the weight main body Wm is different from the above-described embodiment in that it is disposed in the lower part of the weight main body Wm. In this embodiment, it is desirable to increase the number of the movable pulleys 6 and the fixed pulleys 5 so that the weight main body Wm can be suspended in a balanced manner even if the dynamic pulley 6 is disposed below the weight main body Wm. In the example shown, four sets of the moving pulley 6 and the fixed pulley 5 are distributed in the front, rear, left and right of the weight body Wm so that the weight body Wm can be stably suspended by at least four ropes A in the front, rear, left and right. ing.

FIG. 14 shows a reference example. In this reference example, the ropes A1 and A2 are divided into two systems for raising and lowering the grab bucket G and for hanging the weight, and accordingly, the sheave at the upper end of the boom B is also divided into two systems, that is, the first system. The second sheaves S1 and S2 are arranged separately.

Thus, in the present reference example, the first rope A1 for raising and lowering the grab bucket G is connected to the grab bucket G at one end side thereof, and the work table 2 or the elevator side at the other end side through the first sheave S1. The bucket G is connected to the winch 40 on the guide frame 4, and the bucket G is raised by the winding operation of the winch 40, and the bucket G is lowered by the feeding operation.

  On the other hand, the second rope A2 for hanging the weight is attached to the grab bucket G at one end side, and the other end side is wound around the moving pulley 6 via the second sheave S2 and the fixed pulley 5 to receive the weight W. Therefore, the entire weight of the weight W can be partially or completely offset with the weight of the grab bucket G via the second rope A2.

Further, even in this type of labor-saving grab work boat, any of the weight changing means C of the above-described embodiments can be implemented (in FIG. 14, the weight changing means C of the first embodiment is implemented). In this case, the same effects as those in the above embodiments can be expected .

  As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.

  For example, in the above-described embodiment, the work table 2 that pivotally supports the boom B so that it can be raised and lowered is mounted on the carriage 1 so as to be able to turn in a horizontal plane (that is, around the vertical axis). The work table may be fixed to the carriage so as not to move relative thereto, or may be slidably mounted.

In the above embodiment, the trolley 1 is capable of navigating by itself. However, in the present invention, a trolley that is not capable of navigating by itself may be used and pulled by another ship .

In the first to third embodiments, only one sheave S, S1, S2 at the tip of the boom B is provided. However, in the present invention, the grab bucket G and the weight W are stably suspended. In addition, a plurality of sheaves having the same function may be used in parallel. In this case, there are a plurality of ropes guided by the sheaves, and a plurality of fixed pulleys and moving pulleys around which the ropes are wound are required in accordance with the number of sheaves.

Further, in order to change the overall weight of the weight W, the first, second and fourth embodiments adopt a method in which the weight pieces W1, W2 are attached to and detached from the weight body Wm, and in the third embodiment, In the present invention, a method of supplying and discharging liquid (including liquids such as water, muddy water, oil, or a mixed liquid thereof) into the tank portion 30 of the weight body Wm is shown. You may make it change the whole weight of the weight W by using both types together.

1 is a general view showing a labor-saving grab work boat according to a first embodiment of the present invention; Side view showing weight change means according to the first embodiment (enlarged view of the part 2 in FIG. 1) 3-3 sectional view of FIG. 4-4 enlarged cross-sectional view of FIG. The disassembled perspective view which shows the principal part of the weight change means of the weight based on 1st Example. Side view showing weight changing means according to the second embodiment (corresponding to FIG. 2) 7-7 enlarged sectional view of line 7-7 FIG. 6 is an enlarged sectional view taken along line 8-8. The perspective view which shows the principal part of the weight change means based on 2nd Example. Overall view showing a labor-saving grab work boat according to a third embodiment of the present invention. 11 enlarged view of FIG. 10 (corresponding to FIGS. 2 and 6) 12-12 sectional view of FIG. FIG. 2 is a diagram corresponding to FIG. 2 showing weight changing means according to the fourth embodiment. Overall view showing a labor-saving grab work boat according to a reference example

A ... rope A1 ... first rope A2 ... second rope B ... boom C ... weight change means CY ... lift cylinder G as lift means grab bucket S ... · Sheave S1 · · 1st sheave S2 · · 2nd sheaves J, J '· · · · · · · · · · · · · · · · · · · · · Weight body W1, W2 · · · Weight piece 1 · · · carrier 2 ..Working platform 5 ... fixed pulley 4 ... lift guide frame 6 ... moving pulley
7a, 7b ... the left and right side walls of the weight body
7c: Upper wall of the weight body
8. Elevating and guiding means 30 .. Hollow part 31 as tank part.. Water supply means 32 as liquid supply means. Drainage means 40 as liquid discharge means.

Claims (2)

A boom (B) pivotally supported by a workbench (2) mounted on a trolley (1) and supported so that a sheave (S) is rotatably supported at the tip, and a side of the workbench (2). elevating lift guide frame erected Rutotomoni top to a fixed pulley (5) is pivotally supported and (4), and the weight of the movable pulley (6) is pivotally supported (W), the weight (W) Lift guide means (8) for guiding the guide frame (4) so that it can be moved up and down in a fixed posture and cannot rotate and move laterally, a grab bucket (G) capable of gripping the sediment on the bottom of the water, and this grab bucket (G) A rope (A) having one end attached thereto and the other end wound around the movable pulley (6) through the sheave (S) and the fixed pulley (5) to suspend the weight (W); The weight is interposed between the weight (W) and the work table (2) or the lifting guide frame (4) and extends vertically. W) and a lifting cylinder for lifting and lowering (CY), said so as to offset the weight and part or all of the grab buckets (G) through the entire weight of the weight (W) rope (A) A labor-saving grab work boat ,
The weight body (Wm) of the weight (W) has left and right side wall portions (7a, 7b) and left and right side wall portions (7a, 7b) arranged on the left and right sides of the elevating cylinder (CY). ) And an upper wall portion (7c) that integrally couples the upper end portions of the elevating cylinder (CY) to the upper wall portion (7c),
The weight changing means (C) capable of arbitrarily changing the entire weight of the weight (W) can be placed on the carriage (1) so as to be vertically stacked on both left and right sides of the elevating cylinder (CY). Two weight pieces (W1, W2) and a part or all of these weight pieces (W1, W2) are attached and detached in a state where they are vertically stacked on the lower ends of the left and right side wall portions (7a, 7b). A labor-saving grab work boat characterized by comprising coupling means (J, J ′) that can be coupled together . A boom (B) pivotally supported by a workbench (2) mounted on a trolley (1) and supported so that a sheave (S) is rotatably supported at the tip, and a side of the workbench (2). The elevating guide frame (4), which is erected and on which the fixed pulley (5) is pivotally supported, the weight (W) on which the movable pulley (6) is pivotally supported, and the weight (W) is raised and lowered Lift guide means (8) for guiding the guide frame (4) so that it can be moved up and down in a fixed posture and cannot rotate and move laterally, a grab bucket (G) capable of gripping the sediment on the bottom of the water, and this grab bucket (G) A rope (A) having one end attached thereto and the other end wound around the movable pulley (6) through the sheave (S) and the fixed pulley (5) to suspend the weight (W); The weight is interposed between the weight (W) and the work table (2) or the lifting guide frame (4) and extends vertically. An elevating cylinder (CY) for elevating and lowering W), and the entire weight of the weight (W) is partially or completely offset with the weight of the grab bucket (G) via the rope (A). A labor-saving grab work boat,
The weight body (Wm) of the weight (W) has left and right side wall portions (7a, 7b) and left and right side wall portions (7a, 7b) arranged on the left and right sides of the elevating cylinder (CY). ) And an upper wall portion (7c) that integrally couples the upper end portions of the elevating cylinder (CY) to the upper wall portion (7c),
A weight changing liquid in which the weight changing means (C) capable of arbitrarily changing the entire weight of the weight (W) is formed by forming the left and right side walls (7a, 7b) hollow, respectively. the reservoir can be a tank portion (30), a liquid supply means (31) of the tank section (30), and wherein the constructed out with the liquid discharge means (32) from the tank (30) to, labor-saving grab work boats.

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