JP5445403B2 - Counterweight desorption device for work machines - Google Patents

Description

  The present invention relates to a counterweight desorbing device for desorbing a counterweight mounted on a rear end portion of an upper swing body in a base machine in a working machine such as a hydraulic excavator or a demolition machine configured as a base. It is.

  FIGS. 6A, 6B, and 6C show three types of work machines that are application examples of the present invention.

  Fig. 6 (a) is a high place demolition machine that performs high place demolition work such as high-rise buildings, (b) is a low place demolition machine that performs low place demolition work such as low and middle-rise buildings, Demolition backhoe machines for collecting and excavating work are shown.

  These base machines B are a crawler type lower traveling body 1 and an upper swing with a cabin mounted on the lower traveling body 1 so as to be pivotable around an axis (rotation central axis) X perpendicular to the ground. The body 2 and a counterweight 3 mounted on the rear end of the upper swing body 2 are attached to the base machine B (upper swing body 2) with work attachments A1, A2, A3 having different specifications for each machine. Is done.

  Each attachment A1, A2, A3 is configured by attaching a front member for each machine to the tip of a common main boom 4 attached to the upper swing body 2 so as to be freely raised and lowered.

  That is, three types of front booms 5, 6, and 7 having different shapes and sizes are connected to the front end of the main boom 4 so as to be detachable and interchangeable to form booms 8, 9, and 10. Arms 11, 12, and 13 having shapes and sizes suitable for the respective 10 tips, and working devices (open / close type crushing devices, clamps, buckets) 14, 15, and 16 are attached to the tips of these arms 11 to 13, respectively. .

  Further, as hydraulic cylinders for operating the attachments A1, A2 and A3, a common boom cylinder 17 for raising and lowering the main boom 4 (entire attachment), arm cylinders 18, 19, and 20 for operating the arms 11 to 13, and a working device Work device cylinders 21, 22, and 23 for operating 14 to 16 are provided.

  The working devices 14 and 15 of (a) and (b) are further provided with an opening / closing cylinder (not shown).

  Further, in the lower part dismantling machine of (b), the front boom 6 is rotatably connected to the tip of the main boom 4 via the adapter 24 and is rotated by the front boom cylinder 25.

  On the other hand, in the case of a normal shovel (not shown), a U-shaped boom is attached to the upper swing body 2, and an arm is attached to the tip of the boom as a front member, and a bucket is attached to the tip of the arm. Arm and bucket cylinders are attached to form a work attachment.

  In this case, the U-shaped boom corresponds to the main boom 4 of the working machine shown in FIGS.

  In such a working machine, for example, it is raised to the roof of the building for building demolition work, or it is lowered to the basement for underground excavation work, etc. May be brought into

  However, the larger the machine, the higher the crane cost and the more difficult it is to secure the crane installation space.

  Therefore, it can be considered that the machine is disassembled into a plurality of units, carried into a work place, and assembled on site.

  In this case, even if the carry-in can be performed by a crane, the assembly is necessary by itself when the crane cannot be used for the assembly.

  As a machine configuration suitable for this self-assembly, the configuration of Patent Document 1 can be employed.

  An example of the dismantling backhoe machine of FIG. 6C will be described with reference to FIGS.

  In this machine, a set of the base machine B and the main boom 4 (hereinafter referred to as a main boom set), a set of the front boom 7, the arm 13, and the work device (bucket) 16 (the bucket 16 may be removed). (Hereinafter referred to as a front boom set) and separately carried into the work site and assembled on site.

  At the ends of the main and front booms 4 and 7 that are connected to each other, the upper boom holes 26 and 27 at the upper part in the horizontal state of the boom and the lower pin holes 28 at the lower part are used as the front boom connection part and the main boom connection part. , 29 are provided, and as locking means, a locking pin 30 protruding in the boom width direction on the outer surface of the distal end of the main boom 4 and a locking hook 31 opening downward at the base end of the front boom 7 are provided. Each is provided.

  When assembling, the main boom group is caused to approach the front boom group by the self-propelling function of the base machine B (lower traveling body 1), and the main boom 4 is raised by using the hoisting function by the boom cylinder 17, as shown in FIGS. In this way, the “pinning up” operation (first operation) for rotating the main boom 4 upward by engaging the locking pin 30 with the locking hook 31 is performed.

  As a result, the main and front booms 4 and 7 are rotated relative to each other about the locking pin 30 so that the upper pin holes 26 and 27 coincide with each other, and the upper pin 32 is inserted into the coincident upper pin holes 26 and 27. .

  Next, as shown in FIG. 10, the main boom 4 is further rotated upward, and the front boom 7 is rotated downward (first downward direction) about the upper pin 32, whereby the locking hook 31 is locked. A second operation is performed in which the lower pin holes 28 and 29 are made to coincide with each other while being separated from 30, and the lower pin 33 is inserted into both the pin holes 28 and 29.

  In this way, the main boom 4 (main boom set) and the front boom 7 (front boom set) are connected, and the work attachment A3 of FIG. 6C is assembled.

  Disassembly is performed by the reverse procedure and operation.

  As for the locking means, the locking pin 30 can be provided on the front boom 7 side and the locking hook 31 can be provided on the main boom 4 side, contrary to the above.

  On the other hand, since the counterweight 3 occupies a large proportion of the total weight of the base machine, it is necessary to remove the counterweight 3 from the upper swing body 2 and carry it back on site.

  In this case, in a situation where the crane cannot be used for assembling / disassembling, the counterweight 3 needs to be detached and attached by itself as well as the attachment in order to enable consistent assembling / disassembling by itself.

  Conventionally, the techniques disclosed in Patent Documents 2 to 4 are known as self-removing techniques for the counterweight.

JP 2009-293261 A JP 2002-167807 A Japanese Utility Model Publication No. 5-85789 JP 2006-62789 A

  However, since all of the above-mentioned known technologies are built-in base machines in which a counter weight or a desorption unit such as a hydraulic cylinder is incorporated in the rear part of the upper swing body, the counter weight and the engine surroundings are compared to a standard hydraulic excavator base machine. A special design that affects the layout of the product is required.

  On the other hand, hydraulic excavators, in particular, small rear swivel excavators, have a layout design in which counter weights and devices around the engine are arranged as much as possible in order to reduce the amount of rear overhang.

  Accordingly, it is very difficult to adopt the above-mentioned known technology, and it is necessary to change the equipment and parts around the engine, and it is also necessary to change the mold in the case of a cast counterweight. As a result, the cost is significantly increased.

  Therefore, the present invention provides a counterweight demounting device for a work machine that can demount and remove the counterweight by itself without any changes to the base machine (counterweight and engine surroundings).

  According to the first aspect of the present invention, the upper swing body is mounted on the lower traveling body so as to be rotatable about an axis perpendicular to the ground, and a counterweight is detachably mounted at the rear end of the upper swing body. And a work attachment is attached to the upper swing body, and the work attachment is a counterweight self-removing / removing device for a work machine configured by connecting a front member to a boom that moves up and down by a boom cylinder. A weight detachable frame is detachably attached to the boom in place of the front member, and a lifting position for raising and lowering the counter weight is provided on the basis of the weight detachable frame, and the counter weight is mounted on the upper swing body. And the weight to be moved between the removal position away from the upper swing body In which wearing unit is configured.

  According to a second aspect of the present invention, in the configuration of the first aspect, the boom has a front boom as one of the front members selected from a plurality of types at the tip of the main boom attached to the upper swing body. Each of the connecting portions is configured to be detachably and interchangeably connected, and the weight detachable frame is detachably attached to the main boom instead of the front boom.

According to a third aspect of the present invention, in the configuration of the second aspect, as the connecting portion of the main and front booms, an upper pin hole is provided at the upper part and the lower pin is provided at the lower part of the boom in a state where the booms are phase-connected. Each of the holes is provided with a locking hook on one side and a locking pin on the other side as locking means.
(i) a first operation for causing one pin hole of the upper and lower pin holes to coincide by locking the locking pin to the locking hook and rotating the main boom upward;
(ii) By rotating the main boom further upward with the pin inserted into the matched pin hole, the front boom is pivoted downward about the pin to match the other pin hole. The two booms are connected to each other by the second operation and separated by the reverse operation, and the weight attaching / detaching frame has two pins corresponding to both the upper and lower pin holes provided in the front boom. Of the locking pin and the locking hook, a locking means for locking to the locking means provided on the front boom is provided.

  According to a fourth aspect of the present invention, in the configuration of the second or third aspect, the weight attaching / detaching unit is configured to be able to stand on the ground in an attaching / detaching posture in which the weight attaching / detaching frame is attached to / detached from the main boom. .

  According to a fifth aspect of the present invention, in the structure according to any one of the first to fourth aspects, as the lifting means, a lifting cylinder that extends and contracts in the vertical direction is attached to one end of the weight attaching / detaching frame. The weight attaching / detaching unit is configured by providing a lifting tool for hanging the weight, and configured to move the counterweight between the mounting position and the removing position by the boom raising and lowering operation and the lifting cylinder extending and retracting operation. It has been done.

  According to a sixth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, as the lifting means, the weight attaching / detaching frame is provided with a hanging arm that expands and contracts in a horizontal direction when the boom is raised. A lifting cylinder extending and contracting in the vertical direction is provided at the tip, and a lifting tool for hanging a counterweight is provided at the lower end of the lifting cylinder to constitute the counterweight detaching unit.

  According to a seventh aspect of the present invention, in the structure according to any one of the first to fourth aspects, as the lifting means, the weight detachable frame includes a motor-driven winch and a suspension rope drawn from the winch. A guide sheave suspended from one end is provided, and a suspension tool for suspending a counterweight is suspended from the suspension rope to constitute the counterweight detachable unit.

  According to the present invention, the weight attaching / detaching frame is attached to the boom constituting the work attachment (the main boom in claims 2 to 4), the lifting means for raising and lowering the counter weight is provided on the basis of the frame, and the counter weight is set to the attachment position. Since the weight removal unit that moves between the removal position is configured, that is, the counterweight is removed by itself using the boom that was originally installed on the machine, the counterweight or engine area is designed as a standard design. There is no need to change anything.

  For this reason, the design is facilitated, and since it is not necessary to change the devices and parts and the counterweight type due to the design change, the cost can be very low.

  In this case, according to the invention of claim 2, as shown in FIGS. 6 (a) to 6 (c), a front boom selected from a plurality of types is attached to the tip of a common main boom attached to the upper swing body. In a main boom shared work machine in which a boom is configured that is connected in a detachable and interchangeable manner, a weight detachment unit is constructed by attaching a weight detachment frame to the main boom instead of the front boom. Regardless, the same desorption device can be configured.

  Therefore, a plurality of types of attachment / detachment units having different configurations for each machine are not used properly, and the attachment / detachment procedure and operation of the attachment / detachment frame are not changed, which is extremely advantageous in terms of cost and workability.

  According to the invention of claim 3, in the machine capable of detaching the main boom and the front boom by itself as shown in FIGS. 6 (a) to 6 (c) and FIGS. 7 to 10, the counter weight can be detachable by itself. Assembling / disassembling of the machine including the removal and installation of the machine can be performed consistently without using a crane, so the use of the machine can be expanded, and it is effective in reducing the construction cost and shortening the construction period.

  According to the invention of claim 4, since the weight detaching unit is self-supporting on the ground in a detaching posture in which the weight detaching frame is detachably attached to the main boom, a work for holding the unit in the detaching posture and an operation for making the unit self-supporting are performed. It becomes unnecessary and the workability is improved.

  According to the fifth and seventh aspects of the invention, since the counterweight is moved between the mounting position and the detaching position by using the boom hoisting operation, the apparatus configuration can be simplified and the cost can be reduced.

  According to the invention of claim 6, the counterweight is moved between both positions by the expansion and contraction movement of the suspension arm and the vertical movement of the lifting cylinder, that is, both the horizontal movement and the vertical movement of the counterweight are performed separately. It is easy to work.

1 is a side view of a machine showing a first embodiment of the present invention. (a)-(d) is a schematic side view which shows the assembly procedure of the apparatus by 1st Embodiment. (a)-(d) is a schematic side view which shows the counterweight removal procedure by 1st Embodiment. It is a side view of the machine which shows 2nd Embodiment of this invention. It is a side view of the machine which shows 3rd Embodiment of this invention. (a)-(c) is a schematic side view which shows three types of main boom shared type working machines with which this invention is applied. It is a perspective view which shows 1 of the connection procedure of the main boom and front boom in the same machine. It is a side view showing procedure 2 of the same. It is a side view which shows 3 of a procedure same as the above. It is a side view which shows 4 of a procedure same as the above.

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

  The embodiment is applied to a main boom shared work machine shown in FIGS.

  In each of the first to third embodiments, the following configuration is the same as that of the work machine shown in FIGS.

  (I) A base machine B includes a crawler-type lower traveling body 1 and an upper portion with a cabin mounted on the lower traveling body 1 so as to be rotatable about an axis (swivel center axis) X perpendicular to the ground. It consists of a revolving body 2 and a counterweight 3 mounted on the rear end of the upper revolving body 2, and a work attachment having different specifications for each machine is mounted on the base machine B (upper revolving body 2).

  (II) Each work attachment is provided with a common main boom 4 that can be raised and lowered on the upper swing body 2, and a front boom selected from three types having different shapes and sizes is provided at the tip of the main boom 4. The boom is configured to be detachable and interchangeable.

  (III) An arm of a suitable shape and size is attached to the tip of this boom, and a working device (open / close type crusher, clamp, bucket) is attached to the tip of this arm.

  (IV) A common boom cylinder 17 that raises and lowers the main boom 4 (the entire attachment), an arm cylinder that operates the arm, and a work device cylinder that operates the work device are provided as hydraulic cylinders that operate the attachment.

  Further, through each embodiment, weight detachable frames 34, 35, 36 are attached to the front end of the main boom 4 instead of the front boom, and weight detachable units U1-U3 are configured based on the weight detachable frames 34-36. The

  The weight attaching / detaching frames 34 to 36 are engaged with the first and second pin holes 37 and 38 corresponding to the upper and lower pin holes 26 and 28 of the main boom 4 and the engaging pins 30 of the main boom 4. A stop hook 39 is provided, and the frames 34 to 36 are detachably attached to the main boom 4 by the same first and second operations (described later in the first embodiment) as when the front boom 7 is attached to and detached from the main boom 4. .

1st Embodiment (refer FIGS. 1-3)
The weight attaching / detaching frame 34 according to the first embodiment is horizontally long when viewed from the side in the lifted state, and protrudes downward so that one side portion (base end portion) 34a in the length direction is wider than the other side portion. It is formed in a substantially triangular shape with a portion and a closed box shape (which may be a shape other than a box shape, such as an H-shaped cross section or a U shape).

  Further, as shown in FIG. 2 (a), the weight attaching / detaching frame 34 has a base end face 34b formed in a straight flat surface so that the base end face 34b can stand by itself in a vertically long posture, and the center of gravity is independent. It is set to an appropriate position (base end side).

  A lifting cylinder (hydraulic cylinder) 40 extending in the vertical direction is attached to the tip of the weight attaching / detaching frame 34, and a lifting tool fastened to a suspension ring 41 provided on the upper surface of the counterweight 3 at the lower end of the lifting cylinder 40. 42 (refer FIG. 3) is attached, and the weight removal | desorption unit U1 is comprised.

  The hanging tool 42 may be configured by connecting a plurality of shackles as illustrated, or may use a wire or a link having both ends formed in an annular shape.

  1 to 3, reference numeral 43 denotes a storage bracket for storing the lifting cylinder 40 along the weight attaching / detaching frame 34.

  2A to 2D show a procedure for attaching the weight attaching / detaching frame 34 to the main boom 4.

  In addition, in order to avoid complication of FIG. 2, the code | symbol of the pin hole, pin, and latching hook in the same figure is abbreviate | omitted, and shall use FIG. 1 about these.

  As shown in (a), the base machine B is brought close to the frame 34 in a state where the weight attaching / detaching frame 34 is self-supporting on the ground with the base end 34a facing downward, and the pin holes 26, 28 of the main boom 4 are made the same. It is assumed that the frame 34 is close to both pin holes 37 and 38 (a state corresponding to FIG. 8 when the front boom is connected).

  Next, as shown in (b) and (c), the locking pin 30 is locked to the locking hook 39 by using the self-running function of the base machine B (lower traveling body 1) and the function of raising the main boom 4 by the boom cylinder 17. And a “scooping up” operation (first operation) for rotating the main boom 4 upward (the state corresponding to FIGS. 8 and 9).

  As a result, the weight attaching / detaching frame 34 is rotated around the locking pin 30 with respect to the main boom 4 so that the upper pin holes 26 and 37 coincide with each other. Plug in.

  As the upper pin 44 and the lower pin 45 described below, both upper and lower pins 32 and 33 for mounting the front boom shown in FIGS. 9 and 10 may be used.

  Finally, as shown in (d), the main boom 4 is further rotated upward, and the weight attaching / detaching frame 34 is rotated about the upper pin 44 in the backward tilting direction, whereby the locking hook 39 is locked to the locking pin 30. A second operation is performed in which the lower pin holes 28 and 38 are made to coincide with each other while being separated from each other, and the lower pin 45 is inserted into both the pin holes 28 and 38.

  Thus, the weight attaching / detaching frame 34 is attached to the main boom 4 to constitute the weight attaching / detaching unit U1.

  Also, the removal of the frame 34 is performed by the reverse procedure and operation.

  FIG. 3 shows a procedure for removing the counterweight 3 by the weight attaching / detaching unit U1.

  As shown in (a), in the state where the upper swing body 2 is turned sideways, the main boom 4 is raised to lift the weight detaching unit U1, and the lifting cylinder 40 is suspended and extended just above the suspension ring 41. Then, the suspension tool 42 is fastened to the suspension ring 41.

  Although it is not always necessary to turn the upper swing body 2 sideways, this has the advantage that the moving distance of the counterweight 3 can be shortened.

  Further, the counterweight 3 is released from being fixed to the upper swing body 2 with a bolt or the like at this stage or immediately before.

  Next, after lifting the lifting cylinder 40 and lifting the counterweight 3 as shown in (b), the main boom 4 is further raised until the counterweight 3 comes out of the base machine B as shown in (c).

  Finally, as shown in (d), the lifting cylinder 40 is extended and the counterweight 3 is placed at a position away from the upper swing body 2 (usually the side ground as shown), and then the lifting tool 42 is suspended. Removal work from 41 is completed.

  The counterweight 3 can be attached by the reverse procedure and operation.

  3B to 3D, reference numeral 2a denotes a counterweight support base formed at the rear portion of the upper frame of the upper swing body 2.

  As described above, the weight attaching / detaching frame 34 is attached to the main boom 4 of the boom constituting the work attachment, and the lifting weight 40 for raising and lowering the counter weight 3 is provided on the basis of the frame 34, and the counter weight 3 is attached and detached. Since the weight attaching / detaching unit U1 that moves between the counter weight 3 and the counter weight 3 by itself is attached by using the main boom 4 originally provided in the machine. Eliminates the need for any changes to the standard design.

  For this reason, the design is facilitated, and since it is not necessary to change the devices and parts and the type of the counterweight 3 due to the design change, the cost can be very low.

  In this case, as shown in FIGS. 6A to 6C, a plurality of types of front booms 5 to 7 having different specifications for each type of machine can be attached to and detached from the tip of the common main boom 4 as a part of the front member. In addition, in the main boom shared work machine in which the booms 8 to 10 are configured to be interchangeably connected, the weight detachable unit U1 is configured by attaching the weight detachable frame 34 to the main boom 4, and therefore, regardless of the type of the machine. The same desorption device can be constructed.

  Therefore, a plurality of types of attachment / detachment units having different configurations for each machine are not used properly, and the attachment / detachment procedure and operation of the attachment / detachment frame are not changed, which is extremely advantageous in terms of cost and workability.

  6 (a) to 6 (c) and FIG. 7 to FIG. 10, in a machine that can detach / attach the main boom 4 and the front booms 5 to 7 by itself, the counter weight 3 can also be attached / detached by itself. Assembling / disassembling of the machine including the removal and installation of the machine can be performed consistently without using a crane, so the use of the machine can be expanded, and it is effective in reducing the construction cost and shortening the construction period.

  Furthermore, since the weight detaching unit U1 is self-supporting on the ground in a detaching posture in which the weight detaching frame 34 is detachably attached to the main boom 4, there is no need for a gantry for holding the unit U1 in the detaching posture or a work for making the unit U1 independent. , Workability will be good.

  By the way, the main boom 4 is preliminarily wired with a root side portion (root side piping; indicated by a two-dot chain line in FIG. 1) of the hydraulic piping for each work attachment. The hydraulic piping for the actuator is connected to this root side piping 46.

  Here, according to this counterweight desorbing device, since the weight demounting unit U1 is configured on the basis of the main boom 4, the hydraulic piping to the lifting cylinder 40 can be taken from the root side piping 46. It is no longer necessary to install dedicated hydraulic piping only at times.

  This point is the same in both the following second and third embodiments.

Second and third embodiments (see FIGS. 4 and 5)
Only differences from the first embodiment will be described.

  In the second embodiment shown in FIG. 4, the weight attaching / detaching frame 35 attached to the tip of the main boom 4 is suspended in a horizontal state in a boom raised state (a maximum raised state or a raised angle state below that). An arm 47 is provided, and a lifting cylinder 48 that expands and contracts in the vertical direction is provided at the tip of the suspension arm 47, and a lifting tool 42 is provided at the lower end of the lifting cylinder 48 to constitute a counterweight detachment unit U2.

  35a is a base end portion of the weight attaching / detaching frame 35, and 35b is a flat base end surface for self-supporting.

  The weight attaching / detaching frame 35 is formed in a shape in which the tip end side of the weight attaching / detaching frame 34 of the first embodiment is cut, and a suspension arm 47 is attached to an upper end portion of the frame 35 in a state where the boom is raised.

  The suspension arm 47 is configured to be extendable and contractable by an outer cylinder 49, an inner cylinder 50 that is slidably fitted to the outer cylinder 49 in a telescopic manner, and an expansion / contraction cylinder 51 provided across both the cylinders 49 and 50. Has been.

  The lifting cylinder 48 is suspended from the tip of the inner cylinder 50 of the suspension arm 47 and is retracted and operated in the contracted state of the arm as shown by the solid line in FIG. The counterweight 3 is placed on the ground.

  On the other hand, in the third embodiment shown in FIG. 5, a winch that is driven by a hydraulic motor (not shown) on a base end portion 36a (36b is a base end surface) of a weight attaching / detaching frame 36 having substantially the same shape as the first embodiment. 52 and a guide sheave 54 that hangs the suspension rope 53 drawn from the winch 52 from the front end of the frame.

  A suspension hook 55 as a suspension tool is suspended from the suspension rope 53 to constitute a weight detaching unit U3. The weight detaching frame 36 is raised and lowered, and the winch 52 is wound / rewinded (the suspension hook 55 The counterweight 3 is configured to be attached / detached by an (up / down) operation.

  According to both the second and third embodiments, basically the same effect as that of the first embodiment can be obtained.

  Further, as an effect unique to each embodiment, according to both the first and third embodiments, the counterweight 3 is moved between the mounting position and the detaching position by using the hoisting operation of the main boom 4. Can be simplified and the cost is low.

  On the other hand, according to the second embodiment, the counterweight 3 is mounted and removed by the telescopic movement of the suspension arm 47 and the vertical movement of the lifting cylinder 48, and is moved between both positions, that is, the horizontal and vertical directions of the counterweight 3. Since both of these movements can be performed separately, it is easy to work.

Other embodiments
(1) In the above-described embodiment, the weight detaching units U1 to U3 are configured by attaching the detachable frames 34 to 36 to the tip of the common main boom 4 for the main boom shared work machine. The present invention can also be applied to a work machine having a different main boom, and to a work machine having a single member (for example, a generally U-shaped boom in an excavator) instead of two members of a main boom and a front boom.

  In this case, a weight attaching / detaching frame may be attached to a non-shared main boom or a single member boom.

  (2) If the present invention is applied to a work machine capable of assembling work attachments by itself as in the above-described embodiment, the entire machine including disassembly / assembly of the counterweight is consistently self-supported. Although it is preferable in that it can be performed, the work attachment can be disassembled / assembled by using a crane, and can also be applied to a work machine in which only the counterweight is detached and attached by itself.

B Base machine 1 Lower traveling body 2 Upper swing body 3 Counterweight A1, A2, A3 Work attachment 4 Main boom 5, 6, 7 Front boom as front member 8, 9, 10 Boom 11, 12, 13 As front member Arm 14, 15, 16 Same as working device 17 Boom cylinder 26, 27 Upper pin hole 28, 29 for both main and front booms, Lower pin hole 30 Lock pin 31 as locking means Same as above, Lock hook 32 Upper Pin 33 Lower pin U1, U2, U3 Winch detachment unit 34, 35, 36 Weight detachment frame 34a, 35a, 36a Base end portion 34b, 35b, 36b Base end surface 37, 38 of the frame Pin hole 39 Same as above, Locking hook 40 Lifting cylinder 41 Hate ring 42 Lifting tool 44 Upper pin 45 Lower pin 47 Lifting arm 48 Lifting cylinder 49 Outer cylinder constituting the lifting arm 50 Same as the inner cylinder 51 Same as the expansion cylinder 52 Winch 53 Hanging rope 54 Guide sheave 55 As a lifting tool Hanging hook

Claims (7)

  An upper swing body is mounted on the lower traveling body so as to be rotatable about an axis perpendicular to the ground, and a counter weight is detachably mounted on the rear end of the upper swing body to constitute a base machine. A work attachment is attached to the upper swing body, and the work attachment is a counterweight self-loading / removing device for a work machine configured by connecting a front member to a boom that moves up and down by a boom cylinder. Instead, a weight detachable frame is detachably attached, and a lifting means for raising and lowering the counterweight is provided on the basis of this weight detachable frame, and the counterweight is mounted on the upper swing body and separated from the upper swing body. Consists of a weight removal unit that moves between the removal position Counterweight desorption apparatus for a working machine, characterized in that it is.   In the boom, a front boom as one of the front members selected from a plurality of types is connected to the tip of the main boom attached to the upper swing body so that the front boom can be attached and detached in a compatible manner. 2. The counterweight attaching / detaching device according to claim 1, wherein the weight attaching / detaching frame is detachably attached to the main boom in place of the front boom. As connecting parts for the main and front booms, upper and lower pin holes are provided in the upper part and the lower part in the lower part of the boom in a state where the booms are connected to each other. Stop hook, the other is provided with a locking pin,
(i) a first operation for causing one pin hole of the upper and lower pin holes to coincide by locking the locking pin to the locking hook and rotating the main boom upward;
(ii) By rotating the main boom further upward with the pin inserted into the matched pin hole, the front boom is pivoted downward about the pin to match the other pin hole. The two booms are connected to each other by the second operation and separated by the reverse operation, and the weight attaching / detaching frame has two pins corresponding to both the upper and lower pin holes provided in the front boom. 3. A counterweight attachment / detachment of a work machine according to claim 2, further comprising: a hole and a locking means for locking to a locking means provided on a front boom of the locking pin and the locking hook. apparatus.   4. The counterweight demounting device for a work machine according to claim 2, wherein the weight demounting unit is configured to be able to stand on the ground in a demounting posture in which a weight demounting frame is desorbed from the main boom. .   As the lifting means, a lifting cylinder that vertically expands and contracts is attached to one end of the weight detachable frame, and a lifting tool for suspending a counterweight is provided at the lower end of the lifting cylinder to constitute the weight detaching unit, and the boom 5. The counter weight is configured to move between the attachment position and the removal position by an up-and-down movement and an expansion / contraction operation of the lifting cylinder. 6. Counterweight desorption device for work machines.   As the lifting means, the weight attaching / detaching frame is provided with a lifting arm that expands and contracts in the horizontal direction when the boom is raised, and a lifting cylinder that expands and contracts in the vertical direction is provided at the tip of the lifting arm. The counterweight detaching device for a work machine according to any one of claims 1 to 4, wherein a suspending tool for suspending a counterweight is provided to constitute the counterweight detaching unit.   As the lifting means, the weight attaching / detaching frame is provided with a motor-driven winch and a guide sheave for hanging the suspension rope drawn from the winch from one end of the weight attaching / detaching frame, and the counter weight is suspended from the suspension rope. The counterweight demounting device for a work machine according to any one of claims 1 to 4, wherein the counterweight demounting unit is configured by suspending a hanging tool.

Images