JP5333386B2 - Piping structure of work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To compactly and easily distribute hoses without increasing a boom cross section size or reducing the size of the hoses in a boom piping structure for distributing a plurality of the hoses in a U-turn shape over both proximal end and distal end booms of a telescopic boom. <P>SOLUTION: The total of four hoses folded in the U-turn shape over both proximal end and distal end booms 11 and 12 are divided into two sets of three hoses 17a... of a relatively small diameters and one large-diameter hose 17b, and the hoses of both sets are arranged with the mutually different minimum bend radiuses based on the respective maximum hose diameters and a 90&deg; phase shift in a boom circumferential direction in the state of holding them by different hose supporting and guiding devices 19 and 20. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a piping structure for a working machine that includes an extendable box-shaped boom and that allows piping to partially pass through the boom.

  Explains the background technology using a boom rotating and telescopic work machine, which is used for excavation, dismantling, removal of deposits from molten metal containers, etc. To do.

  This work machine is configured with a hydraulic excavator as a base body, and as shown in FIGS. 5 and 6, an upper swing body 2 is mounted on a crawler type lower traveling body 1 so as to be rotatable around an axis perpendicular to the ground. The base machine A is configured. 3 is a cabin installed on the upper swing body 2.

  The upper swing body 2 of the base machine A includes an upper frame 4, and a box-shaped boom 7 is attached to the upper frame 4 via a boom support frame 5 and a boom support mechanism 6.

  The boom support mechanism 6 has a cylindrical body portion 8, and the boom 7 is rotatably supported around the boom axis X via bearings 9, 9 on both the front and rear sides in a state where the boom 7 passes through the body portion 8. The

  Further, a hydraulic motor and a gear transmission mechanism (both not shown) for transmitting the rotational force to the boom 7 are provided between the body portion 8 and the boom 7 to constitute a boom rotation drive mechanism, and the boom is constituted by the mechanism. 7 is driven to rotate about the boom axis X.

  In FIG. 5, reference numeral 10 denotes a hoisting cylinder provided between the upper frame 4 and the body portion 8, and the body portion 8 and the boom 7 are integrally raised and lowered by the cylinder 10.

  As shown in FIGS. 7 and 8, the boom 7 includes a proximal boom 11 that is a fixed boom, a distal boom 12 that is a movable boom that is slidably fitted to the proximal boom 11 like a telescope, A telescopic cylinder (hydraulic cylinder; only shown in FIGS. 7 and 8) 13 provided in the boom straddling both booms 11 and 12 is configured to be telescopic.

  The telescopic cylinder 13 has a proximal end portion of the cylinder tube fixed to the proximal end boom 11 and a distal end portion fixed to the distal end boom 12.

  On the other hand, as shown in FIG. 5, a plurality of types of hydraulic working devices (a breaker is illustrated in the figure) 14 are attached to the tip of the tip boom 12 so as to be interchangeable. The position and orientation of 14 can be changed.

  In the illustrated example, a crushing vibration breaker using a breaker as a driving source is shown as the working device 14, but an open / close type crushing device, a bucket, or the like is also attached.

  The hydraulic drive portion (breaker, open / close cylinder, bucket cylinder; not shown) of the working device 14 is provided in the distal end side pipe 15 shown in FIG. 7, the boom inner pipe 16 passed through the inner end of the distal end boom 12, and the proximal end boom 11. Is connected to a hydraulic pump and a tank (not shown) mounted on the upper swing body 2 of the base machine A by a base end side pipe 17 that goes out to the outside.

  Here, since the pressure and flow rate of the hydraulic actuator, which is the drive source, vary depending on the type of the work device 14, a plurality of types (plurality) of pipes 15 to 17 having different diameters are provided.

  However, in FIG. 7, for simplification of the drawing, only one of the pipes 15 to 17 is shown.

  In general, a flexible hose is used as both the distal end side and proximal end side pipes 15, 17, and a steel pipe tube is used as the boom inner pipe 16.

  Further, since the base end side pipe (hereinafter referred to as the base end side hose) 17 is disposed across both the base end and the front end booms 11 and 12, as shown in the figure, the base end side pipe (hereinafter referred to as the base end side hose) 17 It is folded in a turn shape.

  The proximal hose 17 is supported and guided by a bendable / extendable hose support guide device 18, and is folded back with a constant bending radius regulated by the hose support guide device 18.

  The hose support guide device 18 is called a clip fixed between a pair of chain-like main bodies connected to a large number of links, such as a cable bear (registered trademark), and opposite links of the main bodies. What consists of a hose clamp member is used.

  The configuration of this type of work machine is shown in Patent Document 1.

JP-A-10-5988

  As the proximal end side hose 17, a plurality of hoses having different diameters are routed according to the type of the working device 14 attached as described above.

  In this case, a total of four hoses are routed: two hoses for supplying and returning pressure oil for the breaker or crushing cylinder, and two hoses for supplying and returning pressure oil for the bucket cylinder. explain.

  In this case, as shown in FIG. 8, two bucket cylinders and a total of three hoses for supplying breaker pressure oil (indicated by “17a” with branch code “a”) are relatively small in diameter. On the other hand, the return hose for the breaker (indicated by “17b” with branch code “b” added) has a relatively large diameter because it is necessary to reduce the pressure loss and ensure the impact performance. Used.

  Hereinafter, the three hoses 17a are referred to as “small-diameter hoses”, and the single hose 17b is referred to as “large-diameter hose”. Moreover, when it is not necessary to distinguish these, it is called a "hose" generically and may be represented by a unified code "17".

  Conventionally, the small-diameter hoses 17a ... and the large-diameter hoses 17b are arranged on the same plane and collectively bent into a U-turn shape.

  Therefore, since the bending radii of all the hoses 17 are unified with the minimum bending radius of the large-diameter hose 17b, the entire hose must be a large bending radius.

  Moreover, since the minimum bending radius of the hose support guide device 18 is determined by the bending radius of the entire hose and the cross-sectional size thereof is determined, the device 18 is also large.

  Moreover, since the telescopic cylinder 13 must also be provided in the boom 7, the space that can be used for piping is limited.

  As a result, the routing work becomes difficult, and the cross-sectional size of the boom 7 must be larger than the original size determined by the strength, thereby increasing the weight of the boom 7 and the height of the boom or machine during transportation. It was to be invited.

  This problem can be alleviated by downsizing the large-diameter hose (breaker return hose) 17b, but this will reduce the impact performance of the breaker.

  Moreover, although the said problem becomes remarkable when a large diameter hose is included as mentioned above, even when it did not include a large diameter hose, it had arisen in the condition where there are many hoses.

  Therefore, the present invention provides a piping structure for a working machine that can compactly arrange a plurality of hoses folded in a U-turn shape without increasing the boom cross-sectional size or downsizing the hose. It is.

  According to the first aspect of the present invention, a box-shaped boom constructed by telescopically fitting a movable boom to a fixed boom is attached to a base machine, a working device attached to the boom, a hydraulic pump for the base machine, In a piping structure of a working machine that folds a plurality of pipes connecting to a tank into a U-turn shape as a flexible hose at a portion straddling both the fixed and movable booms, a plurality of sets of the plurality of hoses at the folded portion In other words, each set hose is arranged with a phase shifted in the boom circumferential direction.

According to a second aspect of the present invention, in the configuration of the first aspect, the plurality of hoses are divided into a plurality of sets according to the hose diameter, and each set has a different minimum bending radius determined by the maximum hose diameter, and The phase is shifted in the boom circumferential direction.

  According to a third aspect of the present invention, in the configuration of the second aspect, the plurality of hoses are a large-diameter hose group including a breaker return hose for driving a breaker, and a small diameter only of a hose having a smaller diameter than the breaker return hose. The hose group is divided into a hose group in which the minimum bending radius of the large-diameter hose group is larger than the minimum bending radius of the small-diameter hose group and the phases are shifted from each other in the boom circumferential direction.

According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, the plurality of hoses are divided into two sets, and the two sets of hoses are arranged with a phase shifted by 90 ° in the boom circumferential direction. .

  According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, the minimum bending radius is set based on the maximum hose diameter in each of the sets of the above-described set hoses. It is held by a hose support guide device that can bend and stretch.

According to the present invention, divided into a plurality of hoses which is folded in a U-turn shape into a plurality of sets, the 90 ° phase shifting the phase of each set hose boom circumferential direction (claim 4, two sets of the boom circumferential direction Because it is arranged ( shifted ), all the hoses can be folded back compactly using the boom space efficiently.

  For this reason, all the hoses can be easily routed without further increasing the cross-sectional size of the boom or downsizing the hoses.

  In particular, as in the inventions of claims 2 and 3, a plurality of hoses are divided into a plurality of sets according to the hose diameter, and each set has a different minimum bending radius determined by the maximum hose diameter. (Bear breaker return hose set has a relatively large minimum bend radius, and other sets have a smaller minimum bend radius.) The effect of the point that can be increased.

Here, when the hoses are divided into two sets, if both hoses are arranged 90 ° out of phase in the boom circumferential direction as in the invention of claim 4, the two hoses are easily arranged with the boom side wall as a guide. Can be searched.

  Further, according to the invention of claim 5 in which each set hose is held and folded back on the hose support guide device, the minimum bending radius of each hose support guide device can be set to a value according to the maximum hose diameter in each set, The space utilization efficiency is particularly improved, and the effect of reducing the boom section size is further enhanced.

It is a side view which shows the piping structure which concerns on embodiment of this invention. It is the II-II line expanded sectional view of FIG. It is a perspective view which shows a front end boom and piping structure. It is the perspective view seen from the direction different from FIG. 1 is a schematic side view showing a boom telescopic / rotary working machine that is an example to which the present invention is applied. It is the same schematic plan view. It is a side view which shows the conventional boom piping structure in the working machine. It is the VIII-VIII line expanded sectional view of FIG.

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

  The embodiment is applied to a boom telescopic / rotary work machine having a hydraulic excavator as a base body shown in FIGS.

  In the embodiment, the following configuration is the same as that shown in FIGS.

  (I) An upper swing body is mounted on a crawler type lower traveling body so as to be rotatable around an axis perpendicular to the ground to constitute a base machine, and a boom support frame and a boom support mechanism are provided on the upper frame of the upper swing body. A box-shaped boom 7 is rotatable around the boom axis and mounted by a boom hoisting cylinder.

  (II) The boom 7 includes a proximal boom 11 that is a fixed boom, a distal boom 12 that is a movable boom that is slidably fitted to the proximal boom 11 in a telescopic manner, and both the booms 11 and 12. A point that is extendable and retractable by an extendable cylinder (hydraulic cylinder) 13 provided inside the boom.

  (III) The telescopic cylinder 13 is such that the proximal end of the cylinder tube is fastened to the proximal boom 11 and the distal end is fastened to the distal boom 12.

  (IV) A hydraulic working device is attached to the tip of the tip boom 12, and the position and orientation of the working device can be changed by raising, lowering, extending, and rotating the boom 7.

  (V) The hydraulic drive portion of this working device is constituted by a distal end side pipe 15 shown in FIG. 1, a boom inner pipe 16 passed through the inner end of the distal end boom 12, and a proximal end side pipe 17 that goes outside from the proximal end boom 11. A point connected to a hydraulic pump and a tank (not shown) mounted on the upper swing body of the base machine.

  (VI) Since the pressure and flow rate of the hydraulic actuator serving as the drive source differ depending on the type of the working device, a plurality of pipes 15 to 17 having different diameters are provided (in FIG. Point only).

  (VII) A flexible hose is used as both the distal end side and proximal end side pipes 15 and 17, and a steel pipe tube is used as the boom inner pipe 16.

  (VIII) A base end side pipe (hereinafter referred to as a base end side hose) 17 is U-turned across the base end and the end booms 11 and 12 as shown in the figure so as to follow the expansion and contraction of the boom 7. The point to be wrapped.

  (IX) The base end side hose 17 is supported and guided by a bendable / extendable hose support guide device, and is folded back with a constant bending radius regulated by the hose support guide device.

  Further, in the embodiment, in accordance with the description of the background art, as the proximal end hose 17, two hoses for supplying and returning pressure oil for a bucket cylinder or a crushing cylinder, and for supplying and returning pressure oil for a breaker In the case where a total of four hoses of the two hoses are routed and as a conventional hose support guide device, like a cable bear (registered trademark), a pair of chains connected to a number of links A case where a main body and a hose clamp member called a clip fixed between opposite links of the main body are used will be described.

  In this case, as shown in FIG. 2, three hoses for bucket cylinder and breaker pressure oil supply (indicated by “17a” with branch code “a”) having relatively small diameters are used. On the other hand, a breaker return hose (denoted by “17b” with branch code “b” added) has a relatively large diameter because it is necessary to reduce the pressure loss and ensure the impact performance.

  Hereinafter, the three hoses 17a are referred to as “small-diameter hoses”, and the single hose 17b is referred to as “large-diameter hose”. Moreover, when it is not necessary to distinguish these, it is called a "hose" generically and may be represented by a unified code "17".

  In the embodiment, on the premise of the above configuration, all the hoses 17 are divided into two groups of three small-diameter hoses 17a ... and one large-diameter hose. It is folded in a U-turn shape while being held by other hose support guide devices 19 and 20.

  The hose support guide devices 19 and 20 are fixed to the proximal boom 11 at one end and the distal end boom 12 at the other end, and follow the expansion and contraction of the boom 7 so as to be integrated with the hoses 17a. Move back and forth.

  Hereinafter, the combination of the small diameter hose set and the hose support guide device 19 is referred to as “small diameter hose unit U1”, and the combination of the large diameter hose 17b and the hose support guide device 20 is referred to as “large diameter hose unit U2.”

  In this case, the small-diameter hose group is based on the largest one of the three small-diameter hoses 17a, and the large-diameter hose has its minimum bending radius determined based on the hose diameter. The cross-sectional sizes of the respective hose support guide devices 19 and 20 are set based on the minimum bending radius.

  In terms of the direction of FIG. 2, the small diameter hose unit U1 is folded up and down between the lower part in the front end boom 12 and the lower surface side of the base end boom 11, and the large diameter hose unit U2 is connected to the front end boom 12. Is folded back in the left-right direction between the right outer surface and the left outer surface.

That is, both sets hoses 17a ..., 17b is in another different minimum bend radius corresponding to the respective maximum hose diameter, and are placed shifted 90 ° phase in the boom circumferential direction.

  According to this piping structure, the following effects can be obtained.

  (A) A plurality of hoses 17 folded in a U-turn shape are divided into two sets of three small-diameter hoses 17a ... and one large-diameter hose 17b. Since the phases are shifted (perpendicularly) in the boom circumferential direction, all the hoses 17a,..., 17b can be folded back compactly by using the upper and lower, left and right boom spaces efficiently without waste.

  (B) Since the folding is performed with a minimum bending radius that is different for each pair (small-diameter hose group has a relatively small bending radius and large-diameter hose 17b has a large bending radius), the occupied space of the entire hose must be minimized. Can do.

  (C) Since the minimum bending radius of both hose support guide devices 19 and 20 can be set to a value corresponding to the maximum hose diameter for each set, the space utilization efficiency is further improved.

  Because of the above points, all the hoses 17 are easily routed without increasing the boom cross-sectional size beyond the size determined by the required boom strength or downsizing the large-diameter hose (breaker return hose) 17. can do.

Further, by arranging the small-diameter hose unit U1 and the large-diameter hose unit U2 with a 90 ° phase shift in the boom circumferential direction , both units U1 and U2 can be easily routed using the boom side wall as a guide.

Other embodiments
(1) In the above embodiment, the case where the four hoses are divided into two groups of three small-diameter hoses 17a ... and one large-diameter hose 17b is exemplified. You may divide into two sets of one hose group and the other hose group which consists of one or more hoses.

  Moreover, when there are many hoses, you may divide into 3 or more sets. In this case, each hose set may be arranged with the phase shifted by an angle of less than 90 ° in the boom circumferential direction.

  (2) As the hose support guide devices 19 and 20, other than those having a large number of clips attached between a pair of chains as described above, for example, a flexible material such as rubber or the like having a U-shaped cross section or tubular shape It is also possible to use a structure in which a large number of hose clamp members are attached on the inside.

  (3) In the above embodiment, the work machine in which the telescopic boom rotates is applied, but the present invention can also be applied to a work machine in which the boom is not rotating.

A base machine 7 telescopic boom 11 proximal boom as a fixed boom 12 distal boom as a movable boom 13 telescopic cylinder 14 working device 15 distal piping 16 boom internal piping 17 proximal piping 17a small diameter hose 17b of proximal piping Large diameter hose 18 Hose support guide device 19, 20 Hose support guide device

Claims (5)

  A box-shaped boom constructed by telescopically fitting a movable boom to a fixed boom is attached to the base machine, and a plurality of machines connecting the working device attached to the boom to the hydraulic pump and tank of the base machine are attached. In a piping structure of a working machine that folds a pipe into a U-turn shape as a flexible hose at a portion straddling both the fixed and movable booms, a plurality of hoses at the folded portion are divided into a plurality of sets, and A piping structure for a working machine, wherein the phase is shifted in the circumferential direction of the boom. The plurality of hoses are divided into a plurality of groups according to the hose diameter, and are arranged with mutually different minimum bending radii determined by the maximum hose diameter for each group, and shifted from each other in the boom circumferential direction. The piping structure for a working machine according to claim 1.   Dividing the plurality of hoses into a large-diameter hose assembly including a breaker return hose for driving a breaker and a small-diameter hose assembly having only a smaller diameter hose than the breaker return hose. 3. The work machine piping structure according to claim 2, wherein the radius is larger than the minimum bending radius of the small-diameter hose set and the phases are shifted from each other in the boom circumferential direction. The piping for a working machine according to any one of claims 1 to 3, wherein the plurality of hoses are divided into two sets, and both sets of hoses are arranged with a phase shifted by 90 ° in the boom circumferential direction. Construction.   Each said hose is hold | maintained in the hose support guide apparatus which can bend and extend separately for every group, and the minimum bending radius was set based on the maximum hose diameter in each group. The piping structure of the working machine according to any one of 4.

Images