JP2012193511A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work machine including a canopy in a simple structure, capable of effectively preventing leaves of a palm or the like from hitting an operator during work.SOLUTION: The work machine comprises a driver seat 7 and a canopy 8 in a revolving super structure 3. The canopy 8 includes a roof 20 covering the upper part of the driver seat 7, a plurality of columns 31 and 32 supporting the roof 20, and a leaf guard 40 covering the periphery of the driver seat 7. The leaf guard 40 has a swingable door part 46 and the door part 46 is provided with a stopper 50 for regulating the swing. The stopper 50 includes an outer side holding part 51b, an inner side holding part 56, and an opening/closing lever 57. By the operation of the opening/closing lever 57, the inner side holding part 56 is displaced to a closed position at which it can be in contact with the column 32 and an open position at which it cannot be in contact with the column 32. At the closed position, the column 32 is held between the outer side holding part 51b and the inner side holding part 56.

Description

  The present invention relates to a work machine such as a hydraulic excavator, and more particularly to a structure of a canopy.

  In this type of work machine, a box-shaped cab in which windows and doors are arranged is generally provided around a driver's seat. Furthermore, in order to prevent rocks and the like from hitting the cab, there is also a model in which a guard composed of a wire mesh or the like is arranged around the cab (Patent Document 1).

  In addition, there is a model in which a small work machine or the like is provided with a canopy that covers only the upper part of the driver's seat without using a cab (Patent Document 2).

  For example, in Patent Document 2, four pillars are erected apart from the front and rear and left and right of the driver's seat, and a canopy roof is provided above each pillar. A protective cover that protects the front of the operator's feet is bolted between the left and right front pillars.

JP-A-9-228422 JP 2001-90116 A

  For example, in tropical regions and subtropical regions, there are many places where tall plants such as cocoons grow. When pioneering or farming work is performed using a work machine in such a place, if the work machine is a model that employs a canopy, the leaves will enter the operation space during the work, and the operator will be hit by the leaves. Get in the way.

  Therefore, an object of the present invention is to provide a work machine having a canopy that can effectively prevent the leaves of the palms and the like from hitting the operator during work, while having a simple structure, and can improve workability. .

  The work machine of the present invention includes a lower traveling body and an upper revolving body provided on the lower traveling body so as to be able to swivel. The upper swing body is provided with a driver's seat and a canopy.

  The canopy includes a roof that covers the upper side of the driver's seat, a plurality of support columns that support the roof, and a protective cover that is supported by the support columns and covers at least a part of the periphery of the driver's seat. The protective cover has a door portion that can swing outward with one side edge as a fulcrum. A stopper for restricting the swinging of the door portion is provided on the other edge of the door portion.

  The stopper is fixed to the door portion, contacts the strut and / or its peripheral portion fixed to the strut, and controls the inner holding portion of the door portion to be inward of the outer holding portion. It has an inner holding part that is supported by the door part and is rotatable about a horizontal axis, and an open / close lever provided integrally with the inner holding part. The opening / closing lever includes an inner lever positioned inside the door portion and an outer lever positioned outside the door portion through an opening formed in the door portion.

  By the operation of either the inner lever or the outer lever, the inner clamping portion is in a closed position where it can come into contact with the column and / or its peripheral part fixed to the column, and its periphery fixed to the column and / or column. It is displaced to the open position where it cannot contact the part. And in the closed position, the support | pillar and its peripheral site | part fixed to the support | pillar are pinched | interposed between an outer side clamping part and an inner side clamping part.

  According to the working machine configured in this way, first, a protective cover is provided on the canopy, and this protective cover covers a necessary part around the driver's seat, so that the leaves can not enter the working space. Can be suppressed. Therefore, workability can be improved.

  Since the protective cover has a swinging door portion, even if a large range of the canopy is covered with the protective cover, the canopy can easily enter and exit by opening and closing the door portion. The door portion is provided with a stopper having an outer clamping portion and an inner clamping portion that sandwich the column and / or its peripheral portion fixed to the column, and either the inner lever or the outer lever located inside or outside the door portion is operated. Thus, the inner holding portion can be displaced between the closed position and the open position. In addition, the support | pillar and its peripheral part fixed to the support | pillar are the concept containing the support | pillar itself, its peripheral part fixed to the support | pillar, and both.

  These open / close levers are provided integrally with the inner clamping portion, and in particular, the outer lever is positioned outside the door portion through an opening formed in the door portion. That is, in this working machine, since the structure of the stopper is extremely simple, it is excellent in productivity and durability.

  For example, it is preferable that the outer clamping portion and the inner clamping portion are positioned apart in the vertical direction. If it does so, since a contact point with a support | pillar etc. will shift | deviate up and down, shakiness and inclination of a door part can be suppressed more stably.

  Moreover, a stopper may be provided in the lower end part in the other edge of a door part, and you may make it provide an auxiliary stopper in the part above the stopper. If it does so, since a door part can be locked up and down, rocking | fluctuation of a door part can be controlled more stably. In addition, since the upper swing body is at a relatively high position, by providing the stopper at the lower end portion of the door portion, the operator can easily operate when boarding the work machine.

  Furthermore, it is preferable that the inner clamping portion is automatically displaced to the closed position in an unloaded state by using a moment difference in force between the opening / closing lever and the inner clamping portion. If it does so, since an inner side clamping arm will always return to a closed position, it can hold | maintain stably in the state which closed the door part.

  According to the work machine of the present invention, it is possible to effectively suppress the leaves and the like from hitting the operator during work, so that workability can be improved. Moreover, since it can be realized with a simple structure utilizing the existing structure, it is excellent in productivity and durability.

It is a side view which shows the outline of the working machine of this embodiment. It is a perspective view which shows the outline of the principal part of an upper turning body seen from the diagonally right front. It is a perspective view which shows the outline of the principal part of an upper turning body seen from the diagonally left front. It is a left view which shows the outline of the part of a canopy. It is a perspective view which shows the outline of the principal part (stopper part) of a canopy. It is an exploded view of a stopper. It is a right view which shows the outline of the part of a left side guard. It is a perspective view which shows the outline of the principal part (part of an auxiliary stopper) of a canopy. It is an exploded view of an auxiliary stopper. It is an exploded view of the principal part of an auxiliary stopper. It is a figure for demonstrating the structure of a holding mechanism. It is the schematic of the principal part which shows a modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is merely illustrative in nature and does not limit the present invention, its application, or its use.

  FIG. 1 shows a hydraulic excavator 1 (exemplary work machine) to which the present invention is applied. The hydraulic excavator 1 is a relatively small model among hydraulic excavators, and a small turning type upper turning body 3 is turnably provided on a crawler type lower traveling body 2. A dozer 4 is provided on the front side of the lower traveling body 2. The upper swing body 3 is provided with an attachment 5, a machine room 6, a driver's seat 7, a canopy 8, and the like.

  In the following description, when directions such as front and rear, left and right, and up and down are indicated, for the sake of convenience, description will be made with reference to the excavator 1 in the figure. Specifically, the left side of the drawing is the front, the right side of the drawing is the rear, the upper side of the drawing is the upper side, the lower side of the drawing is the lower side, the front side of the drawing is the left side, and the rear side of the drawing is the right side. The front-rear direction corresponds to the length direction of the vehicle body, and the left-right direction corresponds to the width direction of the vehicle body.

  The attachment 5 includes a boom 5a, an arm 5b, a bucket 5c, and the like. In the case of this model, the attachment 5 is provided at a substantially central portion on the front side of the base 3a in the upper swing body 3 so as to be able to undulate and swing left and right. A counterweight 9 is disposed at the rear of the upper swing body 3 in order to maintain a front-rear balance with the attachment 5.

  As shown in FIG. 2, the machine room 6 is mainly disposed on a portion extending from the right side portion to the rear portion of the base portion 3a. Inside the machine room 6 are housed various devices (not shown) for driving and controlling the hydraulic excavator 1, such as an engine, a hydraulic pump, a fuel tank, and a control valve.

  The driver's seat 7 on which the operator is seated is disposed in the left portion of the central portion of the upper swing body 3. The driver's seat 7 is arranged in the vertical direction away from the upper surface of the base portion 3a by a predetermined dimension. An operation space 10 is secured around the driver's seat 7, and operation devices such as an operation lever 11 and a pedal 12 are arranged in the operation space 10. A space (an elevator 13) for an operator to enter and exit the operation space 10 is secured at a front portion on the left side of the upper swing body 3.

  The canopy 8 has a basic structure including a roof 20 and a support column that supports the roof 20. The strut is composed of a pair of left and right struts including a right strut 31 and a left strut 32 and is erected on the upper swing body 3. The support columns 31 and 32 are arranged side by side in the front-rear direction on both sides of the driver's seat 7. Each of the columns 31 and 32 is formed by bending a metal tube in an arch shape.

  Specifically, the right column 31 includes a right column front portion 31a that is positioned right in front of the driver's seat 7 and extends in the vertical direction, a right column column rear portion 31b that is positioned in the right rear of the driver's seat 7 and extends in the vertical direction, A right column upper portion 31c extending in the front-rear direction is connected to the upper end of the column front portion 31a and the upper end of the right column rear portion 31b. Similarly, the left column 32 has a left column front portion 32a that extends in the vertical direction and is located on the left front side of the driver seat 7, a left column rear portion 32b that is positioned on the left rear side of the driver seat 7 and extends in the vertical direction, A left column upper part 32c extending in the front-rear direction is connected to the upper end of the column front part 32a and the upper end of the left column rear part 32b.

  Two horizontal struts 33 extending in the left-right direction are connected to the lower portions of the right strut front part 31a and the left strut front part 32a so as to be separated in the vertical direction. The roof 20 is formed in a rectangular plate shape. The roof 20 is disposed between the right column upper part 31c and the left column upper part 32c, and is fixed to these. Therefore, the upper part of the operation space 10 including the driver's seat 7 is covered with the roof 20.

  In the case of the hydraulic excavator 1, as shown in detail in FIG. 3, a leaf guard 40 (protective cover) is attached to the canopy 8 in order to prevent the leaf from entering the operation space 10.

  The leaf guard 40 is attached to the support so as to surround the front, rear, left and right sides of the driver seat 7 and covers the entire periphery of the driver seat 7. Specifically, the leaf guard 40 includes a front guard 41 that covers the front of the driver's seat 7, a left guard 42 that covers the left side of the driver's seat 7, a right guard 43 that covers the right side of the driver's seat 7, and a driver's seat. 7 and a rear guard 44 that covers the rear of 7.

  Further, the leaf guard 40 is provided so as not to cover a portion below the driver seat 7 and to cover only a portion above the driver seat 7 in the vertical direction. Thus, the reason for covering only the upper part of the driver's seat 7 is that if it is a foot, even if a leaf enters the operation space 10, the workability is not greatly impaired, and the material cost can be suppressed. is there.

  The leaf guard 40 of the present embodiment includes a frame-like frame 40a and a wire mesh 40b (an example of a net member) fixed to the frame 40a. The wire mesh 40b only needs to be able to prevent the invasion of leaves, so that the wire diameter is thinner and the pitch between the wires is larger than that for the purpose of preventing intrusion of rocks and the like. Even if the leaf guard 40 is provided, a good working field of view can be secured.

  As shown in FIG. 4, the left guard 42 includes a fixed portion 45 fixed to the canopy 8 and a swingable open / close door 46.

  Specifically, a support member 47 extending in the vertical direction is disposed between the left column front part 32a and the left column rear part 32b in the front-rear direction. The lower end of the support member 47 is fixed to the base portion 3a, and the upper end of the support member 47 is fixed to the left column upper portion 32c. And the fixing | fixed part 45 is arrange | positioned between the support member 47 and the left support | pillar rear part 32b, and the door part 46 is arrange | positioned between the support member 47 and the left support | pillar front part 32a.

  The door portion 46 includes a substantially rectangular door frame 40a (also referred to as a door frame 46a) and a door wire net 46b fixed to the door frame 46a. A rear portion of the door frame 46 a is supported by the support member 47 via a hinge 48. As shown by an arrow line in FIG. 3, the door portion 46 can swing outward with the rear portion as a fulcrum, and the front portion of the door frame 46a (also referred to as a swing end 46c) is in the front-rear direction. When viewed from above, it can be in a state where it overlaps with the fixing portion 45 (closed state) and a state where the swing end 46c is located on the left side of the fixing portion 45 (open state).

  A stopper 50 that restricts the swing of the door 46 is provided at the lower end of the swing end 46c. Further, an auxiliary stopper 70 is provided at the upper end of the swing end 46c.

  As shown in detail in FIGS. 5 and 6, the stopper 50 includes a restriction piece 51 and a lock member 52.

  The restricting piece 51 includes a fastening seat 51a made of a pressed product of a steel plate, and an outer clamping arm 51b (outer clamping portion) that extends substantially orthogonally to the fastening seat 51a from one end of the fastening seat 51a. A plurality of elongated holes 51c extending in parallel are formed in the fastening seat 51a. An elastic resin cover 53 is attached to the outer clamping arm 51b.

  On the other hand, the lower end portion of the swing end 46c is provided with a fastening hole 54 having a female screw and penetrating perpendicularly to the swing direction. The bolt 55 inserted into the long hole 51c is fastened to the fastening hole 54, and the fastening seat 51a is fixed to the swinging end 46c. At this time, since the fixing position of the fastening seat 51a can be shifted in the swinging direction due to the presence of the long hole 51c, the outer clamping arm 51b can be easily and appropriately positioned even if a dimensional error occurs in the door portion 46 or the like.

  In a state where the restricting piece 51 is fixed to the swing end 46c, the outer clamping arm 51b protrudes laterally from the swing end 46c to a position partially overlapping with the left column front portion 32a in the swing direction. Therefore, when the door part 46 swings in the closing direction, the outer holding arm 51b can collide with the left column front part 32a, and the door part 46 can be prevented from swinging inward from the closed state.

  The lock member 52 includes an inner clamping arm 56 (inner clamping portion), an opening / closing lever 57, a cylindrical tube shaft 58, and the like. The inner clamping arm 56 is fixed to the cylindrical shaft 58 and extends in the radial direction of the cylindrical shaft 58. The opening / closing lever 57 includes an inner lever 57 a located inside the door portion 46 and an outer lever 57 b located outside the door portion 46, and these opening / closing levers 57 are also fixed to the cylinder shaft 58.

  The open / close levers 57a and 57b are located away from each other in the axial direction of the cylindrical shaft 58 (the direction of the rotation axis J1) and extend in the same radial direction of the cylindrical shaft 58. When viewed from the axial direction of the cylindrical shaft 58, the open / close levers 57a and 57b are arranged to be deflected to the opposite side of the inner clamping arm 56 with respect to the cylindrical shaft 58, and the open / close levers 57a and 57b and the inner clamping arm 56 are arranged. Is arranged in the shape of a "ku". An elastic resin cover 53 is also attached to the inner clamping arm 56 and the open / close levers 57a and 57b.

  On the other hand, a bearing portion 59 is provided at the lower end portion of the swing end 46c. The bearing portion 59 has a pair of shaft support portions 59a that sandwich the cylindrical shaft 58 in a state where the axial direction coincides with the swinging direction (left-right direction). Each shaft support 59a has a shaft hole 59b. An opening 60 is formed in the lower corner portion of the wire mesh 46b on the swing end 46c side by notching the wire mesh 46b.

  The shaft 61 is inserted into the shaft hole 59b and the cylinder shaft 58 in a state where the outer lever 57b is extended to the outside of the door portion 46 through the opening 60 and the cylinder shaft 58 is inserted between the both shaft support portions 59a. Then, the pins 62 are fitted into both ends of the shaft 61. Thus, the lock member 52 is assembled to the door portion 46.

  The lock member 52 can be rotated about a rotation axis J1 extending in the lateral direction, and as shown in FIG. 7, the inner clamping arm 56 is displaced between a closed position and an open position by operating the opening / closing lever 57. Can do.

  In the closed position (the position indicated by the phantom line in FIG. 4 or FIG. 4), the inner clamping arm 56 projects laterally from the swing end 46c when viewed from the left-right direction (swing direction), and is in front of the left strut. It becomes possible to contact the part 32a. In the open position (the position indicated by the solid line in the figure), the inner clamping arm 56 is hidden by overlapping the door portion 46 when viewed from the left-right direction, and is unable to contact the left strut front portion 32a.

  Then, as shown in FIG. 5, the front portion of the left column is placed between the outer clamping arm 51b and the inner clamping arm 56 by displacing the inner clamping arm 56 to the closed position with the door portion 46 closed. 32a is sandwiched. Therefore, the door portion 46 is restricted from swinging and is kept closed. In the closed state, it is preferable that both the outer clamping arm 51b and the inner clamping arm 56 are in contact with the left strut front portion 32a, but one of them may be in contact with some gap.

  As shown in FIG. 5 and the like, in the state of the closed position, it is preferable that the outer clamping arm 51b and the inner clamping arm 56 are arranged apart from each other in the vertical direction. In the present embodiment, the outer clamping arm 51 b is disposed below the inner clamping arm 56. Compared with the arrangement in the opposed manner, the contact point is shifted up and down, so that rattling and inclination of the door portion 46 can be more stably suppressed.

  Moreover, it is preferable to set the inner clamping arm 56 so as to always return to the closed position. For example, the force moment difference between the opening / closing lever 57 and the inner clamping arm 56 can be used. Specifically, the sum of the moments of force with respect to the rotational axis J1 of both the inner lever 57a and the outer lever 57b is made larger than the moment of force with respect to the rotational axis J1 of the inner clamping arm 56.

  If it does so, when it will be in a no-load state, the lock member 52 will rotate in the direction which the inner side clamping arm 56 raises automatically. If the rotation is restricted so as to stop at a predetermined closed position (for example, the inner holding arm 56 is received by the bearing portion 59 as in a first holding mechanism of the auxiliary stopper 70 described later), the inner holding arm 56 is used. Can be displaced to the closed position.

  Even if the inner clamping arm 56 is crimped to the left strut front part 32a in the closed position, the inner clamping arm 56 may be separated from the left strut front part 32a and become unloaded due to vibration during operation. . Even in such a case, the door portion 46 can be stably held in the closed state by always returning the inner clamping arm 56 to the closed position.

  According to the method using the difference in the moment of force, there is no need to provide a particularly complicated mechanism, so that there is an advantage that the durability is excellent and the manufacturing cost can be suppressed. In addition, the lock member 52 can be rotated and biased using a spring (an example of an elastic member) so that the inner clamping arm 56 is displaced to the closed position.

  As shown in detail in FIGS. 8 and 9, the auxiliary stopper 70 includes an auxiliary regulating piece 71 and an auxiliary lock member 72.

  The auxiliary restricting piece 71 has the same member and structure as the restricting piece 51 described above. Specifically, the auxiliary restricting piece 71 includes a fastening seat 71a in which a long hole 71c is formed, and an outer auxiliary holding arm 71b (outer auxiliary holding portion) to which the resin cover 53 is attached. On the other hand, a fastening hole 74 is provided at the upper end of the swing end 46c, and a bolt 55 inserted into the elongated hole 71c is fastened to the fastening hole 74, and the fastening seat 71a is fixed to the swing end 46c.

  The outer auxiliary holding arm 71b protrudes laterally from the swinging end 46c to a position partially overlapping with the left column front part 32a in the swinging direction, like the outer holding arm 51b. Therefore, when the door portion 46 swings in the closing direction, the outer auxiliary holding arm 71b and the outer auxiliary holding arm 71b collide with the left column front portion 32a, and the door portion 46 swings inward from the closed state. regulate.

  The auxiliary lock member 72 includes an inner auxiliary holding arm 76 (an inner auxiliary holding portion), an auxiliary opening / closing lever 77, a cylindrical second tube shaft 78, and the like. The inner auxiliary clamping arm 76 is fixed to the second cylinder shaft 78 and extends in the radial direction of the second cylinder shaft 78. The auxiliary opening / closing lever 77 is fixed to the second cylinder shaft 78 so as to be located inside the door portion 46.

  When viewed from the axial direction of the second cylinder shaft 78 (the direction of the rotation axis J2), the auxiliary opening / closing lever 77 is disposed on the opposite side of the inner auxiliary clamping arm 76 with respect to the second cylinder shaft 78. An elastic resin cover 53 is also attached to the inner auxiliary clamping arm 76 and the auxiliary opening / closing lever 77.

  On the other hand, a second bearing portion 79 having the same structure as the bearing portion 59 is also provided at the upper end portion of the swing end 46c. The second bearing portion 79 has a pair of second shaft support portions 79a that sandwich the second cylindrical shaft 78 and that have a shaft hole 79b opened. The shaft 61 is inserted into the shaft hole 79 b and the second cylinder shaft 78 in a state where the second cylinder shaft 78 is inserted between the second shaft support portions 79 a, and pins 62 are fitted into both ends of the shaft 61.

  The auxiliary lock member 72 can be rotated about a rotation axis J2 extending in the lateral direction. As shown in FIG. 7, the auxiliary opening / closing lever 77 is operated to close and open the inner auxiliary clamping arm 76. Can be displaced.

  In the closed position (the position indicated by the phantom line in FIG. 4 or FIG. 4), the inner auxiliary clamping arm 76 protrudes laterally from the swing end 46c and can come into contact with the left strut front portion 32a. In the open position (the position indicated by the solid line in the figure), the inner auxiliary clamping arm 76 is in a state of being hidden by overlapping the door portion 46 (see FIG. 8), and cannot be brought into contact with the left strut front portion 32a.

  The upper portion of the left strut front portion 32a is sandwiched between the outer auxiliary holding arm 71b and the inner auxiliary holding arm 76 by displacing the inner auxiliary holding arm 76 in the closed position with the door portion 46 closed. . Therefore, the door portion 46 is restricted from swinging the lower portion by the stopper 50, and the upper portion is also restricted from swinging, so that the closed state can be held more stably.

  As shown in FIG. 8 and the like, in the closed position, the outer auxiliary holding arm 71b and the inner auxiliary holding arm 76 are also preferably arranged apart from each other in the vertical direction. In the present embodiment, the outer auxiliary holding arm 71 b is disposed on the upper side of the inner auxiliary holding arm 76.

  The inner auxiliary clamping arm 76 is restricted from rotating by the first holding mechanism so as to stop at a predetermined closed position.

  Further, the inner auxiliary clamping arm 76 is restricted from rotating by the second holding mechanism so as to stop at a predetermined opening position. In the case of the auxiliary stopper 70, when the inner auxiliary clamping arm 76 is at a position other than the closed position when the door portion 46 is opened and closed, the inner auxiliary clamping arm 76 becomes an obstacle. In particular, it is easy to get in the way when the door 46 is opened and closed from the outside of the canopy 8. If there is the second holding mechanism, the inner auxiliary clamping arm 76 can be held in the open position, and such a problem can be prevented.

  FIG. 10 shows specific examples of the first holding mechanism and the second holding mechanism. The first holding mechanism includes a first engaging portion 81 and a first engaged portion 84. The second holding mechanism includes a second engaging portion 82 and a second engaged portion 85.

  Specifically, the auxiliary lock member 72 includes a first engagement portion 81 provided at the proximal end portion of the inner auxiliary holding arm 76 and a second engagement portion 82 provided at the proximal end portion of the auxiliary opening / closing lever 77. And have. On the other hand, the second bearing portion 79 has a substantially L-shape continuous to a first engaged portion 84 provided on a support wall 79c having a pair of second shaft support portions 79a at both ends, and one side portion of the support wall 79c. And a second engaged portion 85 provided on the lever holding arm 79d.

  The second cylinder shaft 78 located between the pair of second shaft support portions 79a is configured to be slidable in the direction of the rotation axis J2. Similarly to the stopper 50, the auxiliary opening / closing lever 77 has a larger moment of force with respect to the rotation axis J2 than the inner auxiliary holding arm 76, and the inner auxiliary holding arm 76 is always set to return to the closed position. .

  As shown in FIG. 11, in the no-load state, the auxiliary lock member 72 automatically rotates in the direction in which the inner auxiliary clamping arm 76 rises. And since the 1st engaging part 81 is received by the 1st to-be-engaged part 84, the inner side auxiliary clamping arm 76 is hold | maintained in a predetermined closed position (it shows with the continuous line in the figure).

  When the inner auxiliary clamping arm 76 is held at a predetermined open position, the auxiliary opening / closing lever 77 is lifted and the auxiliary lock member 72 is slid in the direction of the rotation axis J2. And the 2nd engaging part 82 is mounted on the 2nd to-be-engaged part 85 as shown with the virtual line in the figure. By doing so, the inner auxiliary clamping arm 76 can be held in a predetermined open position.

  When an operator gets on the excavator 1, first, the outer lever 57b is operated to displace the inner clamping arm 56 to the open position. At this time, since the outer lever 57b is disposed at the lower end of the leaf guard 40, it can be easily reached and easily operated. Then, since the door part 46 can be opened and closed, the operator only has to open the door part 46 and enter the operation space 10 through the elevator 13.

  After boarding, the inner clamping arm 56 is displaced to the closed position by operating the inner lever 57a. As a result, the lower portion of the swing end 46c is restricted from swinging, and the door portion 46 is held closed. Further, the auxiliary opening / closing lever 77 is operated to displace the inner auxiliary holding arm 76 to the closed position. At this time, even if the auxiliary opening / closing lever 77 is located inside the leaf guard 40 and disposed at the upper end, the operator can easily operate it because it is already on board. As a result, the upper portion of the swing end 46c is also prevented from swinging, and the door portion 46 is held more stably in the closed state.

  The periphery of the upper body of the operator seated on the driver's seat 7 is covered with a leaf guard 40. Therefore, for example, even when working at a site where the palm is prosperous, the leaf guard 40 can suppress the palm leaf from entering the operation space 10 and can be operated comfortably.

  When the operator gets off the hydraulic excavator 1, the auxiliary opening / closing lever 77 is operated to displace the inner auxiliary clamping arm 76 to the open position. Then, the inner auxiliary clamping arm 76 is held in the open position by the second holding mechanism. Further, the inner lever 57a is operated to displace the inner clamping arm 56 to the open position. By doing so, the door portion 46 can be opened and closed, so the operator only has to open the door portion 46 and get off the hydraulic excavator 1 through the elevator 13.

  In addition, the working machine according to the present invention is not limited to the above-described embodiment, and includes various other configurations.

  For example, the work machine is not limited to the hydraulic excavator 1 and may be a wheel loader or the like. The lower traveling body 2 is not limited to the crawler type. In short, any model equipped with a canopy 8 can be applied.

  The leaf guard 40 (protective cover) may be provided on a part of the periphery of the driver's seat 7, for example, only on the front and side surfaces. Also in the vertical direction, the protective cover may cover not only the upper part of the driver's seat 7 but also the lower part of the driver's seat 7. The wire mesh of the protective cover can be replaced with a transparent resin plate or glass plate.

  As shown in FIG. 12, the stopper 50 and the auxiliary stopper 70 may be regulated at a peripheral portion of the support column. In the figure, a frame body 90 is fixed inside the left column front portion 32a and the like, and the stoppers 50 and 70 are regulated by the frame body 90. The frame 90 may have the same structure as the protective cover 40.

  The working machine according to the present invention is suitable for pioneering work and agricultural work in tropical regions and subtropical regions where tall plants such as cocoons grow.

1 Excavator (work machine)
2 Lower traveling body 3 Upper turning body 7 Driver's seat 8 Canopy 20 Roof 31 Right column 32 Left column 40 Leaf guard (protective cover)
40a frame 40b wire mesh (net member)
46 Door part 46c Oscillating end 50 Stopper 51b Outside clamping arm (outside clamping part)
56 Inner clamping arm (inner clamping part)
57 Opening / closing lever 70 Auxiliary stopper 71b Outer auxiliary holding arm (outer auxiliary holding part)
76 Inner auxiliary holding arm (inner auxiliary holding part)
77 Auxiliary opening / closing lever

Claims (5)

A lower traveling body,
An upper revolving unit provided on the lower traveling unit so as to be able to swivel;
With
A working machine provided with a driver's seat and a canopy on the upper swing body,
The canopy is
A roof covering above the driver seat;
A plurality of columns supporting the roof;
A protective cover supported by the support and covering at least a part of the periphery of the driver seat;
Have
The protective cover has a door part that can swing outward with one side edge as a fulcrum,
A stopper is provided on the other edge of the door portion to restrict the swinging of the door portion,
The stopper is
An outer holding part that is fixed to the door part and that contacts the support and / or its peripheral part fixed to the support and regulates the inward swing of the door part;
An inner clamping part supported by the door part at a position inside the outer clamping part and rotatable about a horizontal axis;
An opening / closing lever provided integrally with the inner clamping portion;
Have
The opening / closing lever is
An inner lever located inside the door portion;
An outer lever located outside the door part through an opening formed in the door part;
Have
By the operation of either the inner lever or the outer lever, the inner clamping portion is fixed to the support column and / or the support column and the closed position where the inner holding portion can be contacted with the peripheral portion fixed to the support column and / or the support column. Displaced to an open position where it cannot contact the surrounding area,
A work machine in which, in the closed position, the strut and / or its peripheral portion fixed to the strut is sandwiched between the outer sandwiching portion and the inner sandwiching portion. The work machine according to claim 1,
A work machine in which the outer clamping part and the inner clamping part are located apart in the vertical direction. In the work machine according to claim 1 or 2,
The stopper is provided at the lower end of the other edge of the door portion,
An auxiliary stopper is provided in the upper part of the stopper at the other edge of the door part,
The auxiliary stopper is
An outer auxiliary clamping portion that is fixed to the door portion and that contacts the support column and / or its peripheral portion fixed to the support column and regulates swinging inward of the door portion;
An inner auxiliary holding part supported by the door part at a position inside the outer auxiliary holding part and rotatable about a horizontal axis;
An auxiliary opening / closing lever provided integrally with the inner auxiliary clamping portion and operable only from the inner side of the door portion;
Have
By the operation of the auxiliary opening / closing lever, the inner auxiliary clamping portion is placed in a closed position where the inner auxiliary holding portion can be contacted with the support column and / or its peripheral portion fixed to the support column, and at the peripheral portion fixed to the support column and / or the support column. Displaced to the open position where contact is impossible,
A work machine in which, in the closed position, the strut and / or its peripheral part fixed to the strut is sandwiched between the outer auxiliary sandwiching portion and the inner auxiliary sandwiching portion. In the work machine according to any one of claims 1 to 3,
A work machine in which the inner clamping unit is automatically displaced to a closed position in a no-load state by using a force moment difference between the opening / closing lever and the inner clamping unit. In the work machine according to any one of claims 1 to 4,
A work machine in which a net member is used for the protective cover.

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