JP2008163958A - Cylinder protective cover device - Google Patents

Abstract

An object of the present invention is to make it possible to easily attach and detach to / from a cylinder and to hold the cylinder so that it does not fall off when the cylinder is extended and contracted.
In order to detachably fix a fixing cylinder portion 24 at an end portion of a bellows portion 23 constituting a cover member 21 to a rod lead-out portion 15 of a cylinder tube 11, a cover end in which an elastic member is formed in a cylindrical shape. A cover in which the fastening member 40 is attached to the outer peripheral portion of the rod lead-out portion 15 and fixed using the cylindrical body fastening member 50, and the fixing cylinder portion 24 is fixed to the outer peripheral surface of the cover end fastening member 40. A fixing surface is formed, and the fixing cylindrical portions 24 and 25 at both ends of the cover member 21 are brought into contact with this and a cylindrical portion of the connecting member 16 provided at the tip of the piston rod 12, thereby covering the same structure. The band 31 of the tightening means 30 is detachably fixed by being tightened by the driver portion 32.
[Selection] Figure 2

Description

  The present invention relates to a cylinder protective cover device for protecting a piston rod protruding from a cylinder tube of a cylinder mounted on a hydraulic working machine or the like.

  As a hydraulic working machine that operates in the field, for example, a hydraulic excavator includes a front working machine that performs work such as excavation of earth and sand, and the front working machine includes a boom and an arm, and a front attachment such as a bucket. Each of these members is driven by a hydraulic cylinder. The hydraulic cylinder is provided so that the piston rod protrudes from the cylinder tube, and a member connected thereto, for example, a bucket, is driven by expanding and contracting the piston rod with respect to the cylinder tube.

  A hydraulic excavator is used for excavation of earth and sand in the field. Foreign matter such as dust adheres to the hydraulic cylinder that drives the front work machine, and also collides with flying objects such as rocks and structures such as concrete. there is a possibility. In particular, if the piston rod expands and contracts while dust or the like is attached, fine particles may enter the cylinder tube. Further, when the piston rod collides with another object, the surface of the piston rod may be damaged or deformed.

Therefore, for example, Patent Document 1 discloses that a piston rod is protected by attaching a protective cover to the hydraulic cylinder. This known protective cover is composed of a flexible member such as a cylinder whose one end is fixed to the tip of the piston rod and the other end is fixed to the cylinder tube, and expands and contracts following the expansion and contraction of the cylinder. Is. Therefore, the piston rod is reliably protected from the most contracted position to the most extended position of the cylinder.
JP 2001-241406 A

  Thus, the protective cover can effectively protect the hydraulic cylinder without foreign matter such as dust adhering to the piston rod, or flying objects such as rocks, obstacles, structures or the like directly colliding with each other. The protective cover is composed of, for example, a bellows structure in which flexible members are connected, and the collision object acts directly on the protective cover. As a result, since the protective cover may be damaged or deteriorated, the protective cover must be replaceably attached to the cylinder.

  Both ends of the protective cover are cylindrical, and appropriate fixing means are provided at the tip of the piston rod, particularly a connecting member inserted into a predetermined member through a connecting pin, and a rod outlet end portion of the cylinder tube or a position in the vicinity thereof. It is fixed detachably using. The protective cover using the fixing means can be attached and detached as easily and quickly as possible, and must be stably held in the mounted state. In particular, when the piston rod extends, a tensile force acts on the protective cover, but the protective cover must be held so as not to fall off due to the tensile force.

  The tip of the piston rod is usually provided with a substantially cylindrical portion, and the mounting condition of the protective cover is good to some extent. Therefore, for example, the end portion of the protective cover can be fixed relatively easily by using a cover tightening member including a band and a fastener, and can be stably held in the fixed state. However, the rod lead-out end of the cylinder tube has various shapes, and some of the connecting parts of the hydraulic piping protrude, so that the cover is fastened according to the structure of the part to which the protective cover is attached. Members must be used. Furthermore, depending on the configuration of the rod lead-out end, the protective cover may not be stably held.

  The present invention has been made in view of the above points, and the object of the present invention is to be able to be easily attached to and detached from the cylinder and to be held so as not to fall off when the cylinder is extended and contracted in the mounted state. It is to provide a cylinder protective cover device.

  In order to achieve the above-described object, the present invention provides a cylinder in which a piston rod is led out from a cylinder tube, and is mounted over the entire length of the piston rod to protect the piston rod of the cylinder. A cylinder protective cover device comprising: a cover member that expands and contracts following the expansion and contraction operation of the rod; and a cover fixing means that both ends of the cover member are detachably fixed to the piston rod and the cylinder tube, The cover fixing means detachably fixed to the cylinder tube has an annular or arcuate shape wound around the outer peripheral surface of the cylinder tube so as to protrude in a direction in which the piston rod of the cylinder tube protrudes. A cover end fastening member made of an elastic plate, and the cover end fastening member The cover is fixed to the outer peripheral surface of the tube, and the end of the cover member is fitted to the cover end fastening member, and can be attached to and detached from the outer peripheral surface of the cylinder tube by the cover fastening member. It is characterized in that it is configured to be fixed to.

  Here, the cylinder tube has a structure in which the rod lead-out portion is connected to a cylindrical member. In the following description, the term “cylinder tube” includes not only the cylindrical main body portion but also the rod lead-out portion. It is a waste. Moreover, although a connecting member is attached to the front-end | tip part of a piston rod, when it is called the front-end | tip part of a piston rod, this connecting member is also included.

  If the cylinder tube rod lead-out end or its vicinity has a substantially cylindrical shape, it is not difficult to fix the cover end fastening member. Are connected so that the pipe connection portion protrudes, and the width dimension on the tip side from the pipe connection portion is extremely narrow. For this reason, the cover member is not directly fixed to the cylinder tube, but the cover end fixing member is attached to the cylinder tube, and the end of the cover member is fixed to the cover end fixing member. Therefore, the cover end fixing member is assembled into the cylinder tube in advance according to the structure corresponding to the cylinder tube, and the cover member fixing member can be used regardless of the structure of the cylinder tube. The configuration and the fastening method can be made constant.

  For example, when the cylinder tube is provided with a pipe connection portion, a notch groove for inserting the pipe connection portion into the cover end fixing member is formed, and the pipe connection portion is inserted into the notch groove. Can be assembled. Thereby, this cover end fixing member can be extended from the pipe connection part to the base end side. Then, when the cover end fastening member is brought into contact with the pipe connection portion or the notch groove is formed in an L shape, the cover end fastening member can be prevented from falling off the cylinder tube. Can be demonstrated. In addition, when a flat part is formed on the outer surface of the cylinder tube, it is easily adapted to the shape of the cylinder tube by forming a thick part that contacts the flat part on the inner surface of the cover end fastening member. Can be made.

  The inner surface of the cover end fastening member must be configured so that a sufficient frictional engagement force acts on the outer surface of the cylinder tube. For this purpose, the cover end fastening member can be made of, for example, a metal elastic plate, and can be used that is brazed so as to have an annular shape or an arc shape. By tightening the cover end fastening member made of this elastic plate with a fixture, the cover has a substantially cylindrical shape and can be fixed to the outer surface of the cylinder tube. Since the end of the cover member is fixed to the outer surface of the front end side of the cover end fixing member, the surface to which the cover is fixed has a substantially cylindrical shape, and the cover end fixing member is at least a rod of the cylinder tube. The lead-out side portion may have a length that can be wound around at least ½ rotation of the circumference, and may partially overlap at 360 degrees or more. As a result, the same cover end fastening member can be attached to cylinder tubes having slightly different outer diameters. However, it is not preferable that the cover end fastening member is wound twice or more because the diameter of the portion becomes thick. Also, since different functions are required for the outer peripheral surface and the inner peripheral surface of the cover end fastening member, a highly rigid outer surface member and a friction member such as rubber are used to enhance the fixation to the cylinder tube. Can be provided on the inner surface.

  The cover end fastening member can be attached to the cylinder tube in advance, and once attached, there is almost no need to replace it. On the other hand, the cover member is frequently replaced. One end of the cover member is detachably fixed to the cover fixing surface, which is the outer peripheral surface of the cover end fixing member, and the other end is fixed to the tip of the piston rod. By attaching the cover end fastening member to the cylinder tube, both ends of the cover member can use substantially the same fixing structure.

  Accordingly, the outer peripheral surface of the cover end fixing member is formed in a substantially cylindrical shape so that the cover member can be easily attached and detached, and the axial length of the contact surface of the end portion of the cover member is also increased to some extent. For this purpose, the cover end fixing member is mounted so as to protrude from the end of the cylinder tube toward the lead-out side of the piston rod. However, it goes without saying that the cover end fixing member has a length that does not interfere with the connecting member provided at the tip of the piston rod when the cylinder is reduced. Furthermore, in order to more smoothly and reliably fix the end of the cover member on the outer peripheral surface of the cover end fastening member, a friction surface, a large number of minute engagement claws, A stopper portion such as an arc-shaped stopper ridge can be formed. However, the engaging claw and the stopper ridge do not protrude greatly, but have a slight height.

  Various attachments can be used as means for fixing the cover end fastening member to the cylinder tube. Since the cover end fastening member is rarely removed, if it can be stably fixed, even if this fixing involves some difficulty, or even if it cannot be fixed without using a large jig There is no problem. However, it is preferable that the fixture is detachable. As a specific configuration, for example, a grooved metal or resin band and a loop shape of the band are used, and the inner diameter is reduced. Further, it can be constituted by a fastener having a screw member tightened with respect to a cover end fastening member wound around the cylinder tube.

  Both ends of the cover member are detachably fixed to the cover fastening member and the tip of the piston rod using a cover fastening member. This cover fastening member is performed by clamping or fastening. Since the cover member is frequently exchanged, it can be easily fixed and can be easily removed. And it is made to hold | maintain stably, without falling off loosely in the fixed state. And the replacement | exchange operation | work of a cover member becomes easy by making the fixing mechanism of the both ends of a cover member the same.

  The cover member can be fixed directly to the tip of the piston rod. However, as with the rod outlet end side of the cylinder tube, a cover end fastening member is provided so that the cover member can be attached to and detached from this cover end fastening member. It can also be fixed. Further, the cover member can be expanded and contracted, and can be constituted by, for example, a bellows member. Cylindrical fixing cylindrical portions are provided at both ends of the bellows member, and these are attached to the rod outlet end portion of the cylinder tube and the tip end portion of the piston rod.

  The cover member that protects the piston rod can be easily attached and detached, and in a mounted state, it can be stably held so that it does not fall off during the expansion and contraction of the cylinder.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, FIG. 1 shows an external appearance of a hydraulic excavator as an example of a hydraulic working machine provided with a cylinder to which the protective cover device of the present invention is attached. In the figure, 1 is a lower traveling body of a hydraulic excavator, and 2 is an upper swing body. A front work machine 3 is mounted on the upper swing body 2, and the front work machine 3 includes a boom 4, an arm 5, and a bucket 6 as a front attachment. By operating the front work machine 3, Work such as excavation of earth and sand is performed.

  The boom 4, the arm 5, and the bucket 6 constituting the front work machine 3 are driven by a hydraulically driven cylinder 10. As shown in FIG. 2, the cylinder 10 includes a cylinder tube 11 and a piston rod 12, and a connecting member 14 is connected to one end of the cylinder tube 11, that is, a bottom side end 13. The other end of the cylinder tube 11 is a rod lead-out portion 15 from which the piston rod 12 is led. The piston rod 12 is inserted into the rod lead-out portion 15 so as to extend from the cylinder tube 11 or contract toward the cylinder tube 11 side. A connecting member 16 is provided at the tip of the piston rod 12.

  For example, when configured as a bucket cylinder that drives the bucket 6 constituting the front work machine 3, the connecting member 14 provided at the end of the cylinder tube 11 is connected to the bracket 5a provided on the arm 5, and the piston rod A connecting member 16 provided at the tip of 12 is connected to a link mechanism 6 a connected to the bucket 6. Further, a bucket 6 is connected to the tip of the arm 5 by a connecting pin 7 so as to be relatively rotatable. Therefore, by driving the cylinder 10 provided between the arm 5 and the bucket 6, the bucket 6 is rotated at the tip of the arm 5.

  While the front work machine 3 is driven to perform work such as excavation of earth and sand, rocks and the like may scatter and collide with the cylinder 10. Further, the cylinder 10 may collide with a structure such as concrete or steel frame. Even if the outer surface of the cylinder tube 11 collides with these, it will not receive any special damage. However, when the piston rod 12 is led out from the cylinder tube 11, a rock, a structure, or the like collides with the outer surface of the piston rod 12 to damage the outer surface of the piston rod 12, or cause dents or deformation. There is a possibility. As a result, there is a possibility that the operation of the cylinder 10 may be hindered, and there is a possibility that foreign matter such as dust enters from a damaged portion and contaminates the hydraulic oil flowing through the hydraulic circuit.

  In view of the above, the cylinder protection cover device 20 for protecting the piston rod 12 is attached to the cylinder 10. FIG. 2 separately shows each part of the cylinder protection cover device 20 together with the cylinder 10, and FIG. 3 shows a state where the cylinder protection cover device 20 is assembled to the cylinder 10. .

  As is clear from these drawings, the cylinder protection cover device 20 has a cover member 21. The cover member 21 is configured by using a flexible sheet 22 formed in an annular shape shown in FIG. 4 as a unit and overlapping a predetermined number of the flexible sheets 22 and sequentially connecting them with a sewing means. Here, the flexible sheet 22 can be made of cloth, and a fiber reinforced thermoplastic resin sheet or the like is preferably used. The sewing is preferably made of high strength and excellent weather resistance such as nylon thread.

  Each flexible sheet 22 is sewn with a portion S1 in the vicinity of the inner peripheral edge on one side and a portion S2 in the vicinity of the outer peripheral edge on the other side with respect to the flexible sheet 22 positioned on the front and rear thereof. It is fixed. As a result, as is apparent from FIG. 5, a mountain fold portion 23 a composed of the outer peripheral side fixed portion becomes a valley fold portion 23 b composed of the inner peripheral side fixed portion, and these mountain fold portion 23 a and valley fold portion 23 b become. Are formed one after the other, and the formation portion of the mountain fold portion 23a and the formation portion of the valley fold portion 23b form one pitch and are connected by a predetermined pitch to form a bellows portion 23 having a cylindrical shape as a whole. Is done. Cylindrical fixing cylinder portions 24 and 25 are connected to both end portions of the bellows portion 23, respectively. The fixing cylinder portions 24 and 25 are formed of the same member as the bellows portion 23.

  The fixing cylinder portions 24 and 25 provided at both ends of the bellows portion 23 are formed on the outer peripheral surface of the cylinder tube 11 of the cylinder 10 near the rod outlet end portion and the outer peripheral surface of the connecting member 14 provided at the tip of the piston rod 12. Removably fixed. The fixing cylinder portions 24 and 25 each have an inner diameter corresponding to the outer diameter of the portion to be fixed, but the cylinder tube 11 to which the fixing cylinder portion 24 is fixed and the fixing cylinder portion 25 are fixed. The outer diameter of the connecting member 14 of the piston rod 12 is different. Since the fixing cylinder portion 25 fixed to the connecting member 14 has a small diameter, the connecting portion of the bellows portion 23 to the fixing cylinder portion 24 is continuously reduced in diameter, and therefore on the fixing cylinder portion 25 side. The inner and outer diameters of the flexible sheet 22 constituting the bellows portion 23 are gradually reduced.

  In the bellows portion 23, the flexible sheets 22 are substantially in close contact with each other in the most contracted state. When stretched from both ends from the most contracted state, the front and rear flexible sheets 22 and 22 are separated leaving a mountain fold portion 23a and a valley fold portion 23b, and are stretched while maintaining a cylindrical shape. In the most extended state, the angle of the mountain fold portion 23a and the valley fold portion 23b is maximized. At this time, both the mountain fold portion 23a and the valley fold portion 23b are overlapped by a predetermined sewing allowance between the front and rear flexible sheets 22 and 22, and the other portions are separated from each other.

  The cover member 21 is detachably attached to the cylinder 10. In order to be able to be attached to and detached from the bucket driving cylinder 10 while being connected to the link mechanism 6a provided to be connected to the bracket 5a and the bucket 6 of the arm 5, the bellows part 23 and the fixing cylinder part 24, It is assumed that a split is formed in 25, the split part is opened, and the cylinder 10 is detachable from the side. Therefore, as shown in FIG. 4, the annular flexible sheet 22 has a C shape in which one cut portion is formed in the radial direction, and the flexible sheet 22 is stacked in a predetermined number. Are arranged with the cut portions coincided with each other, thereby forming a cut for attaching to and detaching from the cylinder 10 over the entire length of the bellows portion 23. And in order to make this cut | interruption a connection state, it attaches so that attachment or detachment is possible so that the surface fastener 26 may be spanned. Further, if the tip of the piston rod 12 in the cylinder 10 can be easily attached to and detached from the link mechanism 6a, the piston rod 12 is detached from the link mechanism 6a, and the bellows portion 23 is removed from the tip of the piston rod 12. Since it can be mounted, it is not necessary to form a cut or the like in the flexible sheet 22 of the bellows portion 23 constituting the cylinder protective cover device 20.

  In the cover member 21 of the cylinder protection cover device 20, the fixing cylinder 24 is fixed to the cylinder tube 11, and the fixing cylinder 25 is fixed to the connecting member 14 connected to the tip of the piston rod 12. First, the connecting portion of the connecting member 16 to the piston rod 12 has a cylindrical shape having a predetermined length in the axial direction. Therefore, the fixing cylinder portion 25 of the cover member 21 is detachably fixed to the cylindrical portion of the connecting member 16 using the cover tightening member 30 constituting the cover fixing means.

  As shown in FIGS. 6 and 7, the cover fastening member 30 is made of a metal plate, and has a band 31 having grooves 31a formed on the surface with a predetermined pitch interval, and the band 31 is formed in a loop shape. And a driver portion 32 as a tightening portion in which a screw member 32b for tightening that engages with the groove 31a of the band 31 is rotatably mounted in the housing 32a that is inserted through. When the screw member 32b constituting the driver unit 32 is rotated, one end of the band 31 is sent in the direction of the arrow in FIG. 7, and the loop diameter of the band 31 can be reduced.

  On the other hand, the rod outlet end side of the cylinder tube 11 is not provided with a cylindrical portion having a predetermined width, and the fixing cylinder portion 24 fixed to the cylinder tube 11 side cannot be directly attached. Or at least can not be fixed stably. That is, as is clear from FIG. 2, the rod outlet 15 in the cylinder tube 11 is provided with a pipe connecting portion 18 to which the hydraulic pipe 17 is connected, and the inner surface of the rod outlet 15 is The taper portion 15a has a diameter that is continuously reduced from the front position slightly from the pipe connection portion 18. Therefore, a structure that cannot be stably fixed directly to the cylinder tube 11 (specifically, the rod lead-out portion 15) by a cover fixing means such as a cover fastening member provided to fix the fixing cylinder portion 25. It has become.

  For this reason, in order to secure the site | part which fixes the cylinder part 24 for fixation, it is set as the structure which mounts the cover end fastening member 40 to the cylinder tube 11 side. The cover end fastening member 40 is composed of a metal plate having elasticity in the bending direction, in particular, a curved plate of aluminum, which is a soft metal that does not easily rust. As shown in FIG. 8, the cover end fastening member 40 is bent in advance and is elastically deformed when it is wound around the cylinder tube 11 and a compression force is applied from the outer peripheral side thereof. And is reduced in diameter so as to be in close contact with the outer peripheral surface of the cylinder tube 11. It is most preferable that the cover end fastening member 40 is wound around an angle of approximately 360 degrees or slightly smaller than that when the cover end fastening member 40 is wound around a predetermined position of the cylinder tube 11.

  The cover end fastening member 40 is wound and fixed so as to cover a predetermined width before and after the position where the pipe connecting portion 18 of the rod outlet portion 15 in the cylinder tube 11 is attached. In the rod lead-out portion 15, the pipe connection portion 18 is provided so as to protrude in this way, but the other portions have a substantially cylindrical shape. For this reason, the cover end fastening member 40 is formed with a notch groove 41 through which the pipe connecting portion 18 passes on one end side thereof, and when this notch groove 41 is wound around the rod lead-out portion 15, It is directed in the axial direction, and is extended by a predetermined angle in the arc direction along the way. That is, the notch groove 41 is substantially L-shaped, and therefore the cover end fastening member 40 is inserted through the notch groove 41 through the pipe connecting portion 18 and rotated by a predetermined angle in the circumferential direction. By moving the pipe connection portion 18 to the circumferential groove in the cutout groove 41, a retaining function is exhibited. In place of the L-shaped cutout groove 41, as shown in FIG. 9, a predetermined depth is provided from the ends joined or overlapped with each other as in the cover end fastening member 140. When the concave portions 141a and 141a (or the concave portions may be formed only at one end) and wound around the rod lead-out portion 15, the portions surrounded by the concave portions 141a and 141a are formed. Also, the insertion portion 141 for passing the pipe connection portion 18 also exhibits the above-described retaining function.

  Fixing of the cover end fastening member 40 to the rod lead-out portion 15 is performed by the cylindrical body fastening member 50 constituting the fixture. This cylinder fastening member 50 has the same configuration as the cover fastening member 30 shown in FIGS. 6 and 7. However, since this cylinder fastening member 50 requires a stronger fastening force, the width and thickness of the band 51 are made larger than those of the cover fastening member 30, and the driver portion 52 composed of the housing 52 a and the screw member 52 b. Is also large. The cylinder fastening member 50 is firmly attached to a portion of the rod outlet portion 15 of the cylinder tube 11 closer to the base end side than the pipe connection portion 18, and the cover end fastening member 40 is stably attached to the cylinder tube 11. It is made to fix to.

  The fixing cylinder portion 24 of the cover member 21 is attached to a portion of the outer peripheral surface of the cover end fastening member 40 on the tip side from the attachment position of the cylinder fastening member 50. This portion on the outer peripheral surface of the cover end fixing member 40 is a cover fixing surface to which the fixing cylinder portion 24 is fixed. Accordingly, the inner diameter of the fixing cylinder 24 is substantially the same as or slightly larger than the outer diameter of the cover fastening surface. The fixing cylinder portion 24 is fixed by using a cover tightening member 30 used for fixing the fixing cylinder portion 25 of the cover member 21 to the connecting member 14 provided by connecting to the piston rod 12. However, the fixing cylinder portion 24 has a larger diameter than the fixing cylinder portion 25, and therefore, the length of the band 51 is longer than the length of the band 31.

  Here, in the cover end fastening member 40, a portion where the fixing cylinder portion 24 in the cover member 21 is fixed by the cover fastening member 30 is a tapered portion 15 a of the rod outlet portion 15 in the cylinder tube 11. It is a part. Therefore, at this position, the inner peripheral surface of the cover end fastening member 40 is not in contact with the cylinder tube 11. For this reason, although depending on the strength of the cover end fastening member 40, the stability may be somewhat inferior compared with the fixing portion of the fixing cylinder portion 25. Therefore, in order to prevent the fixing cylinder portion 24 from falling off the cover end fastening member 40, as shown in FIG. 10, the front end side of the cover end fastening member 40, that is, the lead-out side of the piston rod 12 is used. An annular stopper portion 42 that is thicker than the cover end fastening member 40 is attached to the end portion. The tightening position of the fixing cylinder portion 24 of the cover member 21 by the cover tightening member 30 is on the proximal side with respect to the arrangement portion of the stopper portion 42, and is close to the stopper portion 42.

  The stopper portion 42 can be formed of metal, but is formed of, for example, a hard rubber material, and is mounted so as to be folded at a corner portion of the end portion of the cover end fastening member 40. As a result, other members such as the cover member 21 are protected from damage at the edge portion at the end of the cover end fastening member 40. Further, the contact surface of the cover end fastening member 40 on the cylinder tube 11 side can be treated so as to increase the frictional force, and as shown in FIG. 9, the friction member liner 43 is laminated. You can also keep it. As a result, the cover end fastening member 40 is held extremely stably in the attached state.

  By configuring in this way, the cover member 21 is provided at a portion having a different structure and shape, such as the rod lead-out portion 15 of the cylinder tube 11 and the connecting member 16 provided at the tip of the piston rod 12, with respect to the cylinder 10. The fixing cylinders 24 and 25 at both ends are brought into contact with each other, and the screw member 32b constituting the driver part 32 is screwed using the cover fastening member 30 which is the same cover fixing means, and the band 31 is tightened. Therefore, it can be easily fixed. Further, in order to replace the cover member 21 due to damage or the like, the operation of removing the cover member 21 can be easily performed by screwing the screw member 32b of the driver portion 32 and loosening the band 31. Can be removed.

  Accordingly, the cover member 21 can be replaced as a consumable item at the work site. On the other hand, most of the cover end fastening member 40 constituting the attachment portion of the cover member 21 is covered with the cover member 21 at the end of the cylinder tube 11 and is almost damaged. Since there is no, there is almost no need to replace it once it is installed.

1 is an external view of a hydraulic excavator as an example of a hydraulic working machine in which a cylinder protective cover of the present invention is mounted on a hydraulic cylinder. It is composition explanatory drawing which decomposes | disassembles and shows a cylinder protection cover apparatus with a cylinder. It is structure explanatory drawing of the state which incorporated the cylinder protective cover apparatus in the cylinder. It is a top view of the flexible sheet which comprises a bellows member. It is sectional drawing of a bellows member. It is a front view of a fastening member. FIG. 7 is a side view of FIG. 6. It is a perspective view which shows the structure of a cover end fastening member. It is a perspective view which shows the modification of a cover fastening member. It is sectional drawing of a cover end fastening member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cylinder 11 Cylinder tube 12 Piston rod 15 Rod derivation | leading-out part 16 Connection member 18 Piping connection part 20 Cylinder protection cover apparatus 21 Cover member 23 Bellows part 24,25 Fixing cylinder part 30 Cover fastening member 31 Band 32 Driver part 40,140 Cover fastening member 40a Cover fastening surface 41 Notch groove 141 Insertion part 42 Stopper part 50 Cylinder fastening member 51 Band 52 Driver part

Claims (7)

A cylinder in which a piston rod is led out from a cylinder tube, and a cover member which is covered over the entire length of the piston rod and extends and contracts following the expansion and contraction of the piston rod in order to protect the piston rod of the cylinder In the cylinder protective cover device provided with cover fixing means for detachably fixing both ends of the cover member to the piston rod and the cylinder tube,
The cover fixing means that is detachably fixed to the cylinder tube,
A cover end fastening member made of an annular or arcuate elastic plate wound around the outer peripheral surface of the cylinder tube so as to protrude in the direction in which the piston rod of the cylinder tube protrudes;
It is composed of a fixture for fixing the cover end fastening member to the outer peripheral surface of the cylinder tube,
A cylinder protective cover device having a configuration in which an end portion of the cover member is fitted to the cover end fastening member and is detachably fixed to an outer peripheral surface of the cylinder tube by a cover fastening member. A pipe connecting portion is connected to the cylinder tube, and a notch groove through which the pipe connecting portion is inserted is formed in the cover end fastening member, and one side end portion of the cover end fastening member is connected to the cylinder tube. It is arranged at the base end side from the position where the pipe connection part is provided on the outer surface of the cylinder tube, and the other side end part protrudes from the end part of the cylinder tube toward the lead-out direction of the piston rod. The cylinder protective cover device according to claim 1. The cover end fastening member has a length that can be wound around at least 1/2 turn of the circumference of the cylinder tube at the rod lead-out end side, and the fixture includes the cover end fastening member. 3. The cylinder protective cover device according to claim 1, wherein the cylinder protective cover device is constituted by a fastening member mounted so as to be tightened. The cylinder protective cover device according to claim 3, wherein a stopper portion for preventing the cover member from being detached is formed on an outer peripheral surface of the cover end fixing member. The cover tightening member for fixing the cover member to the cover end fastening member includes a band and a loop shape of the band, the inner diameter thereof is reduced, and the cover member is used as the cover end fastening member. The cylinder protective cover device according to any one of claims 1 to 4, wherein the cylinder protective cover device comprises a fastener to be tightened. In order to detachably fix the cover member to the outer peripheral surface of the piston rod, a band and a loop shape of the band are formed, the inner diameter is reduced, and the cover member is attached to the outer peripheral surface of the piston rod. The cylinder protective cover device according to claim 1, wherein the cylinder protective cover device has a cover fastening member including a fastening tool to be fastened. A configuration in which another cover end fastening member made of an annular or arc-shaped elastic plate is wound around the outer peripheral surface of the piston rod, and the other end of the cover member is detachably fixed by a fixture. The cylinder protective cover device according to claim 1, wherein

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