JP5759708B2 - Boom-type work vehicle counterweight attachment / detachment device - Google Patents

Description

  The present invention relates to a counterweight attachment / detachment device that is detachably attached to the rear part of a swivel base of a boom type work vehicle, and in particular, a lifting / lowering hydraulic cylinder is provided on the counterweight side, and the rod tip of the hydraulic cylinder is used as a turntable. The present invention relates to a counterweight attaching / detaching device for a boom-type work vehicle that is attached to and detached from a provided counterweight support.

  In boom-type work vehicles (including mobile cranes, aerial work vehicles, hydraulic excavators, etc.), a counterweight may be attached to the rear of the swivel as a balancer for the load applied to the boom. It is mounted at the rear of the swivel at the site where the car is used. Boom-type work vehicles that use counterweights are generally large, and if the counterweights are installed, the weight limit for running on public roads will be exceeded. The counterweight is attached to the rear part of the swivel of the boom type work vehicle.

  By the way, a hydraulic cylinder is used to raise and lower the counterweight to the height of the support base at the rear of the swivel base in order to attach and detach the counterweight to the rear part of the swivel base, but this lifting hydraulic cylinder is mounted on the counterweight side. Some are installed on the swivel side.

  In the present application, the counterweight attaching / detaching device is intended for a lifting / lowering hydraulic cylinder mounted on the counterweight side. In this manner, the lifting / lowering hydraulic cylinder is provided on the counterweight side. Known examples of the apparatus include those shown in FIGS. 14A to 14C, for example. The counterweight attaching / detaching device shown in FIG. 14 is disclosed in Japanese Patent Laid-Open No. 2002-194774 (Patent Document 1).

  The counterweight attaching / detaching device of this known example (FIG. 14) employs a hydraulic excavator as a boom type work vehicle, and a counter is mounted on the rear part 121 of the hydraulic excavator 102 (hereinafter simply referred to as the rear part 121 of the rotary base). The weight 103 can be detachably mounted. In the counterweight attaching / detaching device of this known example, the lifting / lowering hydraulic cylinder 104 is installed on the counterweight 103 with the rod 142 facing upward, while the counterweight 103 is supported on the rear part 121 of the swivel base. The support stand 122 is provided. In addition, the hydraulic cylinder 104 and the support stand 122 are installed at two places on the left and right, respectively. The hydraulic cylinder 104 has a tube 141 fixed to the counterweight 103, and a rod 142 that protrudes and descends vertically.

  A lateral pin hole 145 is provided at the distal end (upper end) of the rod 142 of the hydraulic cylinder 104, while a lateral pin hole 124 is also provided at the distal end of the support base 122. In the following description, the tip of the rod may be simply referred to as the rod tip.

  In order to mount the counterweight 103 to the rear part 121 of the swivel base with the counterweight attachment / detachment device of this known example, the following operation is performed.

  First, as shown in FIG. 14A, with the counterweight 103 with the hydraulic cylinder 104 lowered onto the ground G, the boom type work vehicle is stopped at a predetermined position and the swivel base 102 is turned to a predetermined position. Thus, the tip end portion (pin hole 124) of the support base 22 is positioned directly above the rod 142 of the hydraulic cylinder 104. 14A, a hydraulic device is connected to the hydraulic cylinder 104 on the counterweight 103 side.

  Next, as shown in FIG. 14 (B), the hydraulic cylinder 104 is extended so that the pin hole 145 at the tip of the rod is aligned with the pin hole 124 on the support base 122 side. 109 is inserted.

  When the hydraulic cylinder 104 is contracted as shown in FIG. 14C in a state where both the pin holes 145 and 124 are connected by the connecting pin 109, the counterweight 103 is pulled up together with the tube 141, and the counterweight 103 Is set at a predetermined position of the rear part 121 of the swivel base.

JP 2002-194774 A

  By the way, in the counterweight attaching / detaching device of the above-mentioned known example (FIG. 14), the pin hole 145 on the hydraulic cylinder 104 (rod tip) side and the support of the swivel base rear part 121 when the counterweight 103 is mounted on the swivel base rear part 121 are supported. There are the following problems in connecting the pin hole 124 on the stage 122 side with the connecting pin 109.

  First, it is necessary to extend the hydraulic cylinder 104 so that the height of the pin hole 145 on the rod 142 side exactly matches the height of the pin hole 124 on the support base 122 side. Adjustment of the amount was troublesome. That is, the height adjustment of both pin holes 145 and 124 can be adjusted only by the amount of expansion / contraction of the hydraulic cylinder 104, but in order to make the heights of both pin holes exactly match, the hydraulic cylinder 104 is adjusted several times. There was a case that had to be extended or contracted (fine adjustment).

  Further, in order to insert the connecting pin 109 into both the pin holes 145 and 124, the pin hole 145 on the hydraulic cylinder 104 side (rod tip) overlaps with the pin hole 124 on the support base 22 side in a concentric position. However, since the rod 142 of the hydraulic cylinder 104 is rotatable about the axis with respect to the tube 141, the pin hole 145 on the rod 142 side is connected to the pin hole 124 on the support base 122 side. Even when the heights are accurately adjusted, the direction of the pin hole 145 on the rod 142 side is often not aligned concentrically with the pin hole 124 on the support stand 122 side (center misalignment). In this case (when the center is misaligned), the rod 142 is rotated with respect to the tube 141 so that the direction of the pin hole 145 on the rod side matches the direction of the pin hole 124 on the support base 122 side. Necessary.

  In this way, when the rod tip of the hydraulic cylinder 104 is connected to the support base 122 by inserting the connecting pin 109 through the both pin holes 145, 124, the height and centering of the pin holes (overlapping) There is a problem that the work to be performed) is troublesome and takes time.

  Therefore, in the present application, when the rod tip of the hydraulic cylinder provided on the counterweight side is supported by the support provided at the rear of the swivel base, the alignment between the rod tip and the support is easily performed in a short time. The present invention has been made for the purpose of providing a counterweight attaching / detaching device for a boom type work vehicle.

  The present invention has the following configuration as means for solving the above problems. The present invention is directed to a counterweight attachment / detachment device for a boom type work vehicle.

[Invention of Claim 1 of the Present Application]
The counterweight attaching / detaching device according to the first aspect of the present invention is for detachably mounting a counterweight on the rear portion of a swivel mounted on a vehicle so as to be freely rotatable, and is equipped on a boom type work vehicle. It is. In addition, there exist a mobile crane, an aerial work vehicle, a hydraulic excavator etc. as a boom type work vehicle equipped with the counterweight attachment / detachment apparatus of this application.

  The counterweight attaching / detaching device according to claim 1 of the present application has the following configuration.

A support base for supporting the counterweight is provided at two positions apart from the left and right of the rear part of the swivel base. In the following description, the rear part of the swivel base may be simply referred to as the rear part of the swivel base.

Each support base at the rear part of the swivel base has a pair of frame parts having a predetermined length in the front and rear, and each frame part is attached in a posture protruding rearward at a position higher than the upper surface of the rear part of the swivel base. .

The counterweight, a pair of hydraulic cylinders for the counterweight elevating rod of the respective hydraulic cylinders are provided in a posture facing upward. Each hydraulic cylinder has a tube fixed to the counterweight, and is installed so that the rod protrudes upward and downward with respect to the counterweight.

At the tip of the rod of each hydraulic cylinder, an expanded portion having a diameter larger than the outer diameter of the rod is provided. In the following description, the tip of the rod may be simply referred to as the rod tip.

  According to the first aspect of the present invention, a bulging portion provided at the tip of the rod may be a member in which a large-diameter bulging member is fixed to the tip of the rod by means such as welding.

Each frame part has a locking member capable of detachably locking the bulging part of the rod tip part, and a locking position and a bulging part capable of locking the bulging part with respect to the frame part . It is installed so that it can be slid in the horizontal direction between the unlocking position for unlocking. When the locking member is in the locking position, the locking member enters the lower surface side of the bulging portion of the rod tip (the lower surface of the bulging portion can be locked from below). It is located outward from the outer shape of the swelled portion (the swelled portion is brought into the unlocked state).

Since the frame unit and the hydraulic cylinder has a left and right pair, respectively, the engaging member is also disposed one on each frame section.

According to the first aspect of the present invention, the locking member is provided with a groove having a width wider than the outer diameter of the rod of the hydraulic cylinder and narrower than the outer diameter of the bulged portion, and the groove is fitted to the rod. The bulging portion can be locked at the opposite edge portion. If it does in this way, in the state which locked the bulging part of the rod tip part with the locking member by the side of a support stand, the slot of this locking member will come to fit a rod on the undersurface side of a bulging part.

  The counterweight attaching / detaching apparatus according to the first aspect is used as follows.

  To attach the counterweight to the rear of the swivel, first place the counterweight with a hydraulic cylinder at a predetermined position where the counterweight can be supported by the support on the rear of the swivel. Swivel to a position just above the hydraulic cylinder).

Next, with the locking member positioned at the unlocking position, the hydraulic cylinder is extended to move the bulged portion of the rod tip up to the height of the locking member on the support base, When the locking member is slid to the locking position, the locking member enters the lower surface side of the bulged portion and the bulged portion is locked by the locking member. At this time, the groove of the locking member is fitted to both sides of the rod on the lower surface side of the bulged portion (the rod enters the groove).

  When the hydraulic cylinder is reduced in a state where the locking member is in the locking position, the rod cannot be moved downward when the lower surface of the bulging portion comes into contact with the upper surface of the locking member. When the counterweight is pulled up, the counterweight can be moved upward, and the counterweight can be mounted at a predetermined height position at the rear of the swivel base.

  Thus, in the counterweight attachment / detachment device according to the first aspect of the present invention, in order to lock (connect) the rod front end portion of the hydraulic cylinder on the counterweight side to the support base at the rear portion of the swivel base, the bulge provided at the rod front end portion The swelled portion can be locked by the locking member by sliding the locking member provided on the support base side with the portion moved up to a predetermined height or more.

  Therefore, in order to lock (connect) the rod tip of the hydraulic cylinder to the support base at the rear of the swivel base, the supported portion of the rod tip relative to the support height (locking member height) on the support base side The height (expanded part height) does not have to be strictly aligned, and even if the rod of the hydraulic cylinder rotates with respect to the tube, the expanded part can always be locked by a locking member. It has become.

[Invention of claim 2 of the present application]
The invention according to claim 2 of the present application is the counterweight attaching / detaching device according to claim 1, further comprising a locking means for locking the locking member to the support base in a non-slidable state when the locking member is in the locking position. It is a thing.

As the lock means used in the second aspect of the present invention, an appropriate configuration can be adopted as long as the locking member can be locked in a non-slidable state at the locking position (for example, a pin insertion type may be used).

[Invention of claim 3 of the present application]
The invention of claim 3 of the present application is also a counterweight attaching / detaching device for a boom type work vehicle for detachably attaching a counterweight to the rear part of the swivel as in the case of claims 1 and 2 above. In the counterweight attaching / detaching device according to the third aspect , the rod tip is provided with a pin hole as a locking structure for locking the rod tip of the hydraulic cylinder to the support at the rear of the swivel. The base is provided with a pin receiving portion that can support the pin inserted into the pin hole of the rod tip with the rod tip projecting upward from the upper surface of the support base from all horizontal directions.

In the counterweight attaching / detaching device according to claim 3 , the pin hole at the rod tip is provided in a horizontal direction, the support base is provided with a rod insertion hole through which the rod tip is inserted vertically, and the pin receiving portion on the support stand side Is provided at the upper edge of the rod insertion hole.

In the counterweight attaching / detaching device according to the third aspect , in a state where the hydraulic cylinder is extended so that the rod tip protrudes upward from the upper surface of the support base, the pin is inserted into the pin hole of the rod tip, and thereafter By reducing the hydraulic cylinder, both end portions of the pin inserted into the pin hole can be supported on the pin receiving portion (the upper surface side edge of the rod insertion hole).

[Invention of claim 4 of the present application]
The invention of claim 4 of the present application is also a counterweight attaching / detaching device for a boom type work vehicle for detachably attaching a counterweight to the rear part of the swivel base, similarly to the above-described claims 1-2 . In the counterweight attaching / detaching device according to claim 4 , an expansion member having a diameter larger than the outer diameter of the rod can be detachably fixed to the rod tip of the hydraulic cylinder, while the outer diameter of the rod is attached to the support base. A rod insertion hole that is larger and smaller than the outer diameter of the expansion member is provided so that the expansion member can be attached to and detached from the rod end portion with the rod end portion protruding above the support base through the rod insertion hole. Is.

In the counterweight attaching / detaching device according to claim 4 , as a method for attaching and detaching the bulging member to the rod tip portion, a member for detaching the bulging member from the rod tip portion by screwing or a pin or the like can be used. Can be adopted.

Then, in the counterweight attaching and detaching apparatus of the fourth aspect, protrudes above the support base upper surface of the rod tip by extending the hydraulic cylinder through the support base of the rod insertion hole when opening the膨形member from the rod tip By attaching a bulging member to the rod tip and then reducing the hydraulic cylinder, the bulging member at the rod tip can be locked to the upper surface of the lip of the rod insertion hole of the support base. .

[Effect of the invention of claim 1 of the present application]
The counterweight attaching / detaching apparatus according to the first aspect of the present invention is placed at a predetermined position where the counterweight is to be mounted, and a hydraulic cylinder provided on the counterweight is extended so that the bulged portion at the tip of the rod is supported by a support base (frame) The swelled portion provided at the rod tip can be locked and released with respect to the frame portion by sliding the locking member in a state where it is moved upward from the locking member provided in the portion). It is like that.

Therefore, in the counterweight attaching / detaching device according to the first aspect, in order to support the rod tip portion of the hydraulic cylinder on the frame portion at the rear of the swivel base, the height of the rod tip portion is strictly aligned with the frame portion . This is not necessary and can be performed regardless of the direction of the rod (without correcting the direction of the rod), so that there is an effect that the rod tip can be supported on the frame portion easily and in a short time. That is, as in the known example shown in FIG. 14, when pins are inserted through and connected to both pin holes, exact height adjustment of the both pin holes and heart polymerization are necessary. According to the first aspect of the present invention, the height can be adjusted to a very about height (the swelled portion only needs to be above the locking member), and the tip end of the rod can be supported by the support base regardless of the direction of the rod.

According to the first aspect of the present invention, the rod of the hydraulic cylinder is fitted into the groove provided in the locking member when the bulge portion is locked, so that the bulge portion can be locked at the opposite edge of the groove. As a result, the bulging portion of the rod tip can be supported from both sides of the rod in the state where the counterweight is suspended, and the bulging portion can be supported in a stable state.

[Effect of the invention of claim 2 of the present application]
According to the invention of claim 2 of the present application, in the counterweight attaching / detaching device of claim 1 , the locking member can be locked to the support base so as not to be slidable by the locking means in a state where the locking member is in the locking position. It is like that.

Therefore, in the counterweight attaching / detaching device according to the second aspect , in addition to the effect of the first aspect, the locking member can be locked at the locking position by the locking means. There is an effect that safety is improved.

[Effect of the invention of claim 3 of the present application]
The counterweight attaching / detaching device according to the third aspect of the present invention supports the pin inserted into the pin hole at the rod tip as a locking structure for locking the rod tip of the hydraulic cylinder to the support at the rear of the swivel. The pin receiving portion provided on the table is configured to be supported from all horizontal directions.

Therefore, in the counterweight attaching / detaching device according to the third aspect , as in the first aspect, the support portion on the support base side is used to lock (connect) the rod tip of the hydraulic cylinder to the support base at the rear of the swivel base. It is not necessary to align the supported part height (pin hole height) of the rod end with respect to the height (pin receiving part height), and the rod of the hydraulic cylinder rotates relative to the tube. However, there is an effect that the pin inserted into the pin hole at the tip of the rod can be supported by the pin receiving portion on the support base in the same direction (the work for correcting the orientation of the rod is unnecessary).

[Effect of the invention of claim 4 of the present application]
The counterweight attaching / detaching device according to the fourth aspect of the present invention enables the bulging member having a diameter larger than the outer diameter of the rod to be detachably fixed to the rod tip of the hydraulic cylinder, while the outer diameter of the rod is supported on the support base. A rod insertion hole that is larger and smaller than the outer diameter of the expansion member is provided, and the expansion member can be attached to and detached from the rod end portion with the rod end portion protruding above the support base through the rod insertion hole. It is a thing.

Therefore, in the counterweight attaching / detaching device according to the fourth aspect as well, as in the first or third aspect , the rod end of the hydraulic cylinder is locked (connected) to the support base at the rear of the swivel base. It is not necessary to precisely align the supported portion height (expanded member mounting height) of the rod tip with respect to the supporting portion height (the height of the upper edge of the rod insertion hole), and the hydraulic pressure Even if the rod of the cylinder rotates with respect to the tube, the expansion member is always in a posture capable of being locked with the edge of the rod insertion hole of the support base (the work for correcting the orientation of the rod is unnecessary). There is.

It is a side view of the boom type work vehicle equipped with the counterweight attaching / detaching device of the first embodiment of the present application, and is an explanatory diagram of the working state when the counterweight is placed at a predetermined position. FIG. 3 is an explanatory diagram of a working state when the counterweight in the boom type work vehicle of FIG. 1 is mounted on the rear part of the swivel base. FIG. 3 is a partially enlarged perspective view of FIG. 2 including a counterweight attaching / detaching device portion of the first embodiment of the present application. It is IV arrow line view of FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is a state change figure from Drawing 5, and is a perspective view of a rod tip part locked state. FIG. 5 is a view corresponding to FIG. 4 in a state where a counterweight is attached to the rear part of the swivel base. FIG. 6 is a view corresponding to FIG. 5 showing a counterweight attaching / detaching device of a second embodiment of the present application. It is a state change figure from Drawing 8, and is a perspective view of a rod tip part locked state. FIG. 6 is a view corresponding to FIG. 5 showing a counterweight attaching / detaching device of a third embodiment of the present application. It is a state change figure from Drawing 10, and is a perspective view of a rod tip part locked state. FIG. 6 is a view corresponding to FIG. 5 showing a counterweight attaching / detaching device of a fourth embodiment of the present application. It is a state change figure from Drawing 12, and is a perspective view of a rod tip part locked state. It is explanatory drawing of a well-known counterweight attachment / detachment apparatus.

Hereinafter, some embodiments of the present application will be described with reference to FIGS. 1 to 13. FIGS. 1 to 7 show a boom type work vehicle equipped with a counterweight attaching / detaching device of the first embodiment and the first embodiment. FIG. 8 and FIG. 9 show details of the counterweight attaching / detaching device of the second embodiment, and FIGS. 10 to 11 show details of the counterweight attaching / detaching device of the third embodiment. FIGS. 12 to 13 show details of the counterweight attaching / detaching device of the fourth embodiment. The counterweight attaching / detaching device of the first embodiment shown in FIGS. 1 to 7 corresponds to claims 1 and 2 of the present application, and the counterweight attaching / detaching device of the second embodiment shown in FIGS. are those corresponding to claim 3, the counterweight attaching and detaching apparatus of a fourth embodiment of the third embodiment and 12-13 in FIG. 10 to 11 are intended to respectively correspond to the claims 4 .

  8 to 9 (second embodiment), FIGS. 10 to 11 (third embodiment), and FIGS. 12 to 13 (fourth embodiment) are shown in FIGS. 5 and 10 of the first embodiment, respectively. This corresponds to 6. The basic configuration of the second to fourth embodiments other than the illustrated portions is the same (or substantially the same) as that used in FIGS. 1 to 4 of the first embodiment. The drawings of the basic components of the second to fourth embodiments are the same as those in FIGS.

[First Example of FIGS. 1 to 7]
In FIG.1 and FIG.2, the large mobile crane is employ | adopted as a boom type work vehicle which mounts a counterweight. In addition, as a boom type work vehicle that can be used in the present application, an aerial work vehicle or a hydraulic excavator can be adopted in addition to the mobile crane.

  The boom type work vehicle shown in FIGS. 1 and 2 has a swivel base 2 mounted on a frame 11 of a vehicle 1 via a swivel bearing 12 so that the swivel base 2 can be swiveled horizontally. Install freely.

  In this type of large boom type work vehicle, the counterweight 3 can be detachably mounted on the rear portion 21 of the swivel base 2. In the following description, the rear part 21 of the swivel base 2 may be simply referred to as the rear part 21 of the swivel base.

  By the way, the counterweight 3 is heavy, and if the counterweight 3 is attached to the rear part 21 of the swivel base, the weight of the counterweight 3 will exceed the weight limit when traveling on public roads. Is transported to the work site in a separate transport vehicle.

  The counterweight 3 used in this embodiment is one in which high-weight side weights 32, 32 are integrally assembled on the left and right sides of a low-height central weight 31 as shown in FIG. Is adopted.

  In order to mount the counterweight 3 to the rear part 21 of the swivel base, as shown in FIG. 1, the counterweight 3 is suspended by its own crane (the telescopic boom 13, the winch 14, the hook 15, etc.) 3 is placed at a predetermined position on the vehicle frame 11 (a position that can be attached to the rear part 21 of the turntable), and then the turntable 2 is turned as shown in FIG. The counterweight 3 is faced.

  A counterweight attaching / detaching device is used to attach the counterweight 3 to the rear part 21 of the swivel base. The counterweight attaching / detaching device of the first embodiment shown in FIGS. 1 to 7 is configured as follows. In the following description, left and right and front and rear refer to the left and right and front and rear when the rear part 21 of the swivel is viewed from the rear, and the rear view is the same as when the rear part 21 of the swivel is viewed from the rear. is there.

  In the counterweight attaching / detaching apparatus of the first embodiment, as shown in FIGS. 3 to 5, a support base 22 for supporting the counterweight 3 is installed at the rear part 21 of the swivel base, while the counterweight 3 is used for raising and lowering. The hydraulic cylinder 4 is provided.

  In order to stably support the counterweight 3, two hydraulic cylinders 4 for raising and lowering are used at two positions spaced apart from each other on the center weight 31. Correspondingly, the support base 22 at the rear part 21 of the swivel base is also left and right. It is provided in two places. In this embodiment, the left and right hydraulic cylinders 4, 4 are slightly displaced in the front-rear direction. That is, in FIG. 3, the left hydraulic cylinder 4 is in a position (front position) near the swivel base 21, and the right hydraulic cylinder 4 is in a position (rear position) far from the swivel back 21.

  Each hydraulic cylinder 4, 4 has its tube 41 fixed to the counterweight 3 with a stopper 43 in such a posture that its rod 42 faces upward. Accordingly, when the hydraulic cylinders 4 and 4 are extended and contracted, the rod 42 moves up and down with respect to the counterweight 3.

  An expanded portion 44 having a diameter larger than the outer diameter of the rod 42 is provided at the tip of the rod 42 of each hydraulic cylinder 4, 4. In the following description, the tip of the rod may be simply referred to as the rod tip.

  Each of the bulged portions 44, 44 is obtained by fixing a disk-shaped steel material having a diameter that is appropriately larger than the outer diameter of the rod 42 to the rod tip portion by welding. In addition, as a method for fixing the bulged portion 44 to the rod tip, an appropriate means such as screw connection or pin connection can be employed in addition to welding.

  Each of the support weights 22 and 22 for supporting the counterweight installed at the rear part 21 of the swivel base has a frame part 23 having a rectangular shape in the rear view and an appropriate length in the front-rear direction. It is attached in a posture that protrudes backward at a position higher than the upper surface of 21.

  A large opening hole 25 through which the swelled portion 44 on the hydraulic cylinder 4 side can be inserted vertically is provided at each distal end portion of each support base 22, 22. The holes 25 and 25 are in correspondence with the swelled portions 44 and 44 provided at the rod tip portions of the hydraulic cylinders 4 and 4 in a state where the counterweight 3 is placed at a position where the counterweight 3 can be attached to the rear part 21 of the swivel base. It is provided at a position where it can be polymerized in a plan view.

  Each of the left and right support bases 22 and 22 (frame portions 23 and 23) is provided with a locking member 50 that can lock the bulged portion 44 at the tip of the rod so as to be slidable back and forth.

  Each of the locking members 50, 50 has an upper surface plate 51 that covers the upper surface of the frame portion 23 and a side surface plate 52 that covers the outer side surface 24 of the frame portion 23. The side plates 52 of the locking member 50 may be provided on both the left and right sides of the top plate 51, respectively.

  FIG. 5 is an enlarged view of the right support base 22 portion of the left and right support bases 22 shown in FIG. 3, and the locking members 50, 50 provided on the left and right support bases 22, 22. Are symmetrical to each other in the rear view. In the following description, the relationship between the locking member 50 and the support base 22 and the relationship between the locking member 50 and the rod tip portion (expanded portion 44) are related to the right side shown in FIGS. The stop member 50 will be described.

  In the side plate 52 of the locking member 50, a long slot 53 is formed in the front and rear, and a guide pin 54 that protrudes outward from the side face 24 of the support base 22 (frame portion 23) in the slot 53. The locking member 50 can be slid back and forth within the length range of the slot 53 with respect to the support base 22. A handle 55 for sliding the locking member 50 back and forth is provided on the upper surface plate 51 of the locking member 50.

  Further, the upper surface plate 51 of the locking member 50 is provided with a groove 56 having a predetermined depth from the rear edge (the front end side of the support base 22) toward the front. The groove 56 is formed wider than the outer diameter of the rod 42 of the hydraulic cylinder 4 and narrower than the outer diameter of the bulging portion 44 at the tip of the rod.

  As will be described in detail later, when the locking member 50 is slid rearward in the state indicated by the chain line (reference numerals 42 ', 44') in FIG. Since the width of the groove 56 is narrower than the outer diameter of the bulged portion 44 at that time, the bulged portion 44 can be supported from below by the opposing edge of the groove 56. Note that the state of FIG. 5 is the unlocked state (locked release position), and the state of FIG. 6 is the locked state (locked position).

  Also, between the locking member 50 and the support base 22, there is a locking means 6 for locking the locking member 50 so that it cannot slide in the locking release position of FIG. 5 and the locking position of FIG. Provided. The locking means 6 of this embodiment includes a pin hole 62 provided on the side plate 52 of the locking member 50 and two front and rear pin holes 63 and 64 provided on the side surface 24 of the support base 22 (frame portion 23). On the other hand, the locking member 50 can be locked at the locking release position of FIG. 5 and the locking position of FIG.

  Next, the usage and function of the counterweight attaching / detaching device of the first embodiment will be described. First, as shown in FIGS. 3 and 4, the counterweight 3 is turned in a state where it is placed at a predetermined position on the vehicle frame 11. The base 2 is pivoted so that the holes 25 and 25 at the front ends of the support bases 22 and 22 are directly above the rod front ends (respectively expanded portions 44 and 44) of the hydraulic cylinders 4 and 4 on the counterweight 3 side. To accurately align. Before extending the hydraulic cylinder 4 on the counterweight 3 side, the locking member 50 is slid forward with respect to the support base 22 as shown in FIGS. 3 and 5, but in this state, the support base The hole 25 at the tip is open to the whole surface. Further, in this state, the locking member 50 is preferably locked in a non-slidable manner by the locking means 6 at the locking release position (the pin hole 62 in the side plate 52 of the locking member 50 and the side surface 24 of the support base 22). The pin 61 is inserted into the front pin hole 63 located at the front).

  In this state, when a hydraulic device is connected to each of the hydraulic cylinders 4 and 4 and both the hydraulic cylinders 4 and 4 are extended at the same time, the rods 42 and 42 on each side are moved upward, so The shape portions 44, 44 move up through the holes 25, 25 at the tip of the support base to a position slightly higher than the height of the upper surface of the locking members 50, 50 (as shown by the chain lines in FIGS. 3 and 5).

  Next, when each pin 61 of the locking means 6 on each side is removed and the handle 55 is gripped and the locking members 50 and 50 are slid rearward (locking side), the locking member as shown in FIG. The groove 56 in the 50 upper surface plate 51 is fitted so as to straddle the rod 42 from the left and right in the vicinity of the lower surface side of the bulged portion 44. In the state of FIG. 6, the pin hole 62 in the side plate 52 of the locking member 50 is overlapped with the rear pin hole 64 in the side surface 24 of the support base 22, and the overlapping pin holes The locking member 50 can be locked so as not to slide by inserting the pin 61 through the pins 62 and 64.

  Then, as shown in FIG. 6, when the hydraulic cylinder 4 is contracted in a state where the locking member 50 is in the locking position, first, the lower surface of the bulging portion 44 is above the left and right opposing edges of the groove 56 of the locking member 50. And the rod 42 cannot be moved downward, and then the tube 41 of the hydraulic cylinder 4 is pulled up to move the counterweight 3 upward, and finally the counterweight 3 is swiveled as shown in FIG. The rear portion 21 can be mounted at a predetermined height position.

  In the final mounting state of the counterweight 3, the counterweight 3 is fixed to the swivel base rear portion 21 by pin-coupling the locking member on the counterweight 3 side to the lock receiving portion on the swivel base rear portion 21 side. The method for fixing the weight 3 is not directly related to the counterweight attaching / detaching device of the present application, and thus the description thereof is omitted.

  In order to remove the counterweight 3 from the state in which the counterweight 3 is attached to the rear part 21 of the swivel base, the reverse procedure to the above may be performed.

  As described above, the counterweight attaching / detaching apparatus of the first embodiment places the counterweight 3 at a predetermined position on the vehicle frame 11 and extends the hydraulic cylinder 4 provided on the counterweight 3 in the extended state of the swivel base rear portion 21. By sliding the locking member 50 provided on the support base 22, the swelled portion 44 provided at the tip of the rod can be locked and released from the support base 22.

  Therefore, in the counterweight attaching / detaching device of the first embodiment, the height of the rod front end portion is strictly set with respect to the support base 22 in order to support the rod front end portion of the hydraulic cylinder 4 on the support base 22 of the swivel base rear portion 21. Therefore, the rod tip can be supported on the support base 22 easily and in a short time because it can be performed regardless of the orientation of the rod 42 (without correcting the orientation of the rod).

  In the counterweight attaching / detaching device of the first embodiment, the groove 56 in the upper surface plate 51 of the locking member 50 is fitted to the rod 42 on the lower surface side of the bulged portion 44 in the counterweight suspended state. The bulging portion 44 can be supported from both sides of the rod 42 by the opposite edge portion of the groove 56, and the bulging portion 44 can be supported in a stable state.

  Further, since the locking member 50 can be locked to the support base 22 by the locking means 6 in a state where the locking member 50 is in the locking position, the locking member 50 is not prepared. Will not be moved to (improves safety).

[Second Embodiment of FIGS. 8 to 9]
The counterweight attaching / detaching device of the second embodiment shown in FIGS. 8 to 9 has a locking structure for locking the rod tip portion of the hydraulic cylinder 4 to the support base 22 of the swivel base rear portion 21 in the first embodiment. A modification is shown.

  That is, in the counterweight attaching / detaching device of the second embodiment, the pin hole 45 is provided at the tip of the rod 42 of the hydraulic cylinder 4 as shown in FIG. 45 portion) projecting upward from the upper surface of the support base 22, as shown in FIG. 9, a pin receiver capable of supporting the connecting pin 9 inserted through the pin hole 45 at the rod tip portion from all horizontal directions. A portion 29 is provided.

  In the case of the second embodiment, a rod insertion hole 28 for inserting the tip end of the rod 42 up and down is provided at the tip end of the support base 22, and a small height is provided at the upper edge of the rod insertion hole 28. It is preferable to provide a cylindrical body and use the cylindrical body as the pin receiving portion 29.

  The other basic configuration of the second embodiment is substantially the same as that of the first embodiment, so that the drawings and description of the first embodiment are used.

  In the counterweight attachment / detachment device of the second embodiment, the hydraulic cylinder 4 is extended from the state shown in FIG. 8 so that the tip of the rod passes through the rod insertion hole 28 of the support base 22 above the upper surface of the pin receiving portion (cylinder) 29. As shown in FIG. 9, after protruding (the state shown by the chain line in FIG. 8), the connecting pin 9 is inserted into the pin hole (reference numeral 45 ′) at the tip of the rod, and then the hydraulic cylinder 4 is contracted. Both end portions of the connecting pin 9 inserted through the pin hole 45 can be supported on the pin receiving portion 29. In FIG. 8, when the connecting pin 9 is inserted into the pin hole 45 ', the connecting pin 9 is concentric with the directing direction of the pin hole 45' regardless of the direction of the pin hole 45 '. It is very easy to insert from the direction (for example, the direction of reference numeral 9 'in FIG. 8).

  Thus, also in the counterweight attaching / detaching device of the second embodiment, the height of the support portion on the support base 22 side is used to lock (connect) the rod front end portion of the hydraulic cylinder 4 to the support base 22 of the swivel base rear portion 21. It is not necessary to precisely align the supported portion height (the height of the pin hole 45) of the rod tip with respect to the height (the height of the pin receiving portion 29), and the rod 42 of the hydraulic cylinder 4 is connected to the tube. Even if it rotates with respect to 41, it is very easy to insert the connecting pin 9 from the direction matched to the direction of the pin hole 45 with respect to the pin hole 45 at the tip of the rod.

  Also in the case of the second embodiment, the counterweight 3 can be mounted at a predetermined height position of the rear part 21 of the swivel base by reducing the hydraulic cylinder 4 from the state of FIG.

  Also in the case of the second embodiment, in order to remove the counterweight 3 from the state in which the counterweight 3 is mounted on the rear part 21 of the swivel base, the reverse procedure to the above may be performed.

[Third Example of FIGS. 10 to 11]
The counterweight attaching / detaching device of the third embodiment shown in FIGS. 10 to 11 also has a locking structure for locking the rod tip portion of the hydraulic cylinder 4 to the support base 22 of the swivel base rear portion 21 in the first embodiment. A modification is shown.

  In the third embodiment, as shown in FIG. 10, a male thread 46 is formed at the tip of the rod 42 of the hydraulic cylinder 4, and a rod insertion hole 28 through which the rod tip can be inserted is provided in the support base 22. In the state where the rod tip is inserted through the rod insertion hole 28 into the upper surface side of the support base 22, the expansion member 7 can be attached to and detached from the male screw 46 at the rod tip by screwing. As the inflatable member 7 used in the third embodiment, a nut having a diameter larger than the diameter of the rod insertion hole 28 is used.

  Since the other basic configuration of the third embodiment is substantially the same as that of the first embodiment, the drawings and description of the first embodiment are used.

  In the counterweight attaching / detaching device of the third embodiment, the hydraulic cylinder 4 is extended from the state shown in FIG. 10 so that the rod tip (male thread 46 portion) protrudes upward from the upper surface of the support base through the rod insertion hole 28 of the support base 22. Then, the expansion cylinder (nut) 7 is screwed into the male thread (reference numeral 46 ') at the tip of the rod, and then the hydraulic cylinder 4 is contracted. 11, the inflatable member 7 screwed into the rod tip can be supported by the upper edge of the rod insertion hole 28.

  Thus, also in the counterweight attaching / detaching apparatus of the third embodiment, the height of the support portion on the support base 22 side is used to lock (connect) the rod front end portion of the hydraulic cylinder 4 to the support base 22 of the swivel base rear portion 21. The height of the supported portion of the rod tip (the height of the male screw 46) does not need to be strictly aligned with the height (the height of the upper edge of the rod insertion hole 28), and the hydraulic pressure Even if the rod 42 of the cylinder 4 rotates with respect to the tube 41, there is no problem in screwing the expansion member (nut) 7 into the male screw 46 at the tip of the rod.

  Also in the case of the third embodiment, the counterweight 3 can be mounted at the predetermined height position of the rear part 21 of the swivel base by reducing the hydraulic cylinder 4 from the state shown in FIG.

  Also in the case of the third embodiment, in order to remove the counterweight 3 from the state in which the counterweight 3 is mounted on the rear part 21 of the swivel base, the reverse procedure to the above may be performed.

[Fourth Embodiment of FIGS. 12 to 13]
The counterweight attaching / detaching device of the fourth embodiment is a modification of the third embodiment (the bulging member is detachably attached to the rod tip).

  In the fourth embodiment, as shown in FIG. 12, a pin hole 45 is formed at the tip of the rod 42 of the hydraulic cylinder 4, and a rod insertion hole 28 through which the rod tip can be inserted is provided in the support base 22. In addition, a bulging member 8 made of a cylindrical body that can be detachably fixed to the rod tip by pin connection and a connecting pin 9 that fixes the bulging member 8 to the rod tip are used.

  The tubular member 8 is provided with a hole 81 through which the rod tip is inserted vertically and a pin hole 82 penetrating horizontally. The connecting pin 9 is inserted through the pin hole 82 of the bulging member 8 and the pin hole 45 at the tip of the rod.

  The other basic configuration of the fourth embodiment is substantially the same as that of the first embodiment, so that each drawing and description of the first embodiment are used.

  In the counterweight attaching / detaching device of the fourth embodiment, the hydraulic cylinder 4 is extended from the state shown in FIG. 12, and the rod tip is projected upward from the upper surface of the support base through the rod insertion hole 28 of the support base 22 (FIG. 12). ), A hole 81 of the bulging member 8 made of a cylindrical body is fitted to the tip of the rod, and the pin hole 82 on the bulging member 8 side and the pin hole 45 ′ on the rod tip side. , The connecting pin 9 is inserted into both pin holes, and then the hydraulic cylinder 4 is contracted, whereby the expansion member 8 pin-connected to the rod tip as shown in FIG. It can be supported by the upper edge of the insertion hole 28.

  Thus, also in the counterweight attaching / detaching device of the fourth embodiment, the height of the support portion on the support base 22 side is used to lock (connect) the rod tip of the hydraulic cylinder 4 to the support base 22 of the swivel base rear portion 21. The height of the supported portion of the rod tip (the height of the pin hole 45 portion) does not have to be strictly aligned with the height (the height of the upper edge of the rod insertion hole 28), and the hydraulic pressure is further increased. Even if the rod 42 of the cylinder 4 rotates with respect to the tube 41, there is no difficulty in inserting the connecting pin 9 through the pin hole 45 at the tip of the rod and the pin hole 82 of the expansion member 8.

  Also in the case of the fourth embodiment, the counterweight 3 can be mounted at a predetermined height position of the swivel base rear portion 21 by reducing the hydraulic cylinder 4 from the state shown in FIG.

  In the case of the fourth embodiment as well, in order to remove the counterweight 3 from the state in which the counterweight 3 is mounted on the rear part 21 of the swivel base, the reverse procedure to the above may be performed.

1 is a vehicle, 2 is a swivel, 3 is a counterweight, 4 is a hydraulic cylinder, 6 is a locking means, 7 and 8 are each an inflatable member, 9 is a connecting pin, 11 is a vehicle frame, 21 is a rear of the swivel, 22 Is a support base, 23 is a frame portion, 28 is a rod insertion hole, 29 is a pin receiving portion, 41 is a tube, 42 is a rod, 44 is a bulging portion, 45 is a pin hole, 46 is a male screw, 50 is a locking member , 56 are grooves, and 82 is a pin hole.

Claims (4)

A counterweight attaching / detaching device for a boom type work vehicle for detachably attaching a counterweight to a rear portion of a swivel mounted on a vehicle so as to be freely rotatable,
A support base for supporting the counterweight is provided at two positions spaced apart on the left and right of the rear part of the swivel base,
Each of the support bases has a frame portion having a predetermined length in the front and rear, and each frame portion is configured to be attached in a posture protruding rearward at a position higher than the upper surface of the rear portion of the swivel base,
Two hydraulic cylinders for the counterweight elevating in the counterweight is provided with a rod facing upward orientation of the respective hydraulic cylinders,
Provided with a bulging portion having a diameter larger than the outer diameter of the rod at the tip of the rod of each hydraulic cylinder,
A locking member that can lock the bulged portion to each frame portion , a locking position that can lock the bulged portion with respect to the frame portion , and a lock that unlocks the bulged portion. Install so that it can slide horizontally between the release position ,
The locking member is provided with a groove wider than the outer diameter of the rod of the hydraulic cylinder and narrower than the outer diameter of the inflated portion, and the groove is fitted to the rod so that the opposite edge of the groove The bulging part can be locked,
A counterweight attaching / detaching device for a boom type work vehicle. In claim 1,
In a state where the locking member is in the locking position, the locking member is provided to lock the locking member so as not to slide with respect to the support base.
A counterweight attaching / detaching device for a boom type work vehicle. A counterweight attaching / detaching device for a boom type work vehicle for detachably attaching a counterweight to a rear portion of a swivel mounted on a vehicle so as to be freely rotatable,
A support base for supporting the counterweight is provided at the rear of the swivel base,
The counterweight is provided with a hydraulic cylinder for raising and lowering the counterweight in such a posture that the rod of the hydraulic cylinder faces upward,
A pin hole is provided at the tip of the rod of the hydraulic cylinder,
A pin receiver that can support the pin inserted into the pin hole at the tip of the rod from all directions in the horizontal direction with the tip of the rod protruding above the upper surface of the support on the support. Has a part,
A counterweight attaching / detaching device for a boom type work vehicle. A counterweight attaching / detaching device for a boom type work vehicle for detachably attaching a counterweight to a rear portion of a swivel mounted on a vehicle so as to be freely rotatable,
A support base for supporting the counterweight is provided at the rear of the swivel base,
The counterweight is provided with a hydraulic cylinder for raising and lowering the counterweight in such a posture that the rod of the hydraulic cylinder faces upward,
An expandable member having a diameter larger than the outer diameter of the rod can be detachably fixed to the tip of the rod of the hydraulic cylinder,
The support base is provided with a rod insertion hole larger than the outer diameter of the rod and smaller than the outer diameter of the expansion member,
The bulging member can be attached to and detached from the tip of the rod in a state where the tip of the rod protrudes above the support base through the rod insertion hole.
A counterweight attaching / detaching device for a boom type work vehicle.

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