JP4670488B2 - Construction machine rear monitoring device - Google Patents

Description

  The present invention relates to a rear monitoring device for a construction machine that is mounted on an upper swing body of a construction machine such as a hydraulic excavator and secures a rear view that cannot be obtained from a cab.

  As a construction machine, for example, a hydraulic excavator has a working unit mounted on an upper swinging body that is mounted on a lower traveling body provided with a self-propelling unit via a swivel device. Work such as excavation is performed. A driver's cab is provided in the upper swing body for the operation of the machine such as traveling of the vehicle by the lower travel body, turning of the upper swing body and operation of the working means. A driver's seat on which an operator is seated is provided in the driver's cabin, and operating means such as an operating lever and a pedal are provided on the left and right sides of the driver's seat and in front of the driver's seat. The operator's cab is located in front of the upper swing body and is provided in parallel with the working means, and a machine room building in which the engine and other equipment are installed is arranged at the rear of the operator's cab. A counterweight is installed at a position behind the machine room building.

  When the hydraulic excavator is in operation, the operator needs to monitor the surroundings for safety confirmation and for ensuring smooth operation. For this reason, the cab is provided with windows around the entire circumference so that the operator can visually recognize the region where the hydraulic excavator is operated with the naked eye. Further, in order to obtain a rear visual field that is difficult to see from the cab, a rearview mirror is mounted at an appropriate position, so that the operator can secure a rear visual field to some extent while keeping the front facing. However, the machine room building located behind the cab has a predetermined height in order to secure a large accommodation space inside it, and there is also a distance to the counterweight disposed at the rearmost part. For this reason, a large blind spot area exists in the rear part of the vehicle. For this reason, especially when the vehicle is moved backward, even if there are protrusions such as structures on the ground or people or animals enter, the operator may not recognize them.

As described above, in order to secure the rear view, a camera is installed on the counterweight, and a monitor is installed in the cab, and the image of the area including the rear is acquired by the camera, and this image is displayed on the monitor. For example, Japanese Patent Application Laid-Open No. H10-228667 discloses a configuration configured to monitor the rear. And in this patent document 1, since the camera installed in the counterweight is exposed outside, the camera is protected from being stolen. Specifically, the camera is attached to a bracket, and the bracket is mounted on the upper swing body so as to be able to be reversed in the vicinity of the engine cover. Therefore, when the camera is used, the bracket is disposed on the building cover, and when the camera is not used, the bracket can be rotated 180 ° and stored in the engine cover.
Japanese Patent Laid-Open No. 10-140619

  The engine cover can be held closed by a key. Therefore, the structure is useful for preventing theft by locking the engine cover in a state where the camera is stored inside the engine cover. However, in order to store and take out the camera in the engine cover, it is necessary to open the engine cover by opening the key, and then reverse the bracket so that the engine cover is closed and locked. It is extremely troublesome. In the first place, the engine cover is not something that opens and closes frequently, but is heavy, and the camera must be stowed in the engine cover each time a day's work is done. Therefore, it is not possible to perform an operation of bringing the camera into an operating state at the start of work, and this operation is extremely difficult and impractical.

  The present invention has been made in view of the above points. The purpose of the present invention is to prevent theft of a camera used for rear monitoring without performing special processing on a casing of a machine room building or a counterweight. It is to be able to take measures to prevent.

In order to achieve the above-described object, the present invention has a camera installed on the upper surface of the counterweight casing in order to obtain a field of view behind the construction machine, and a monitor for displaying an image acquired by the camera is installed in the cab. A rear monitoring device for a construction machine configured to be installed, comprising a cover member and a base member that are detachably connected to an upper surface of the casing, and in which a camera housing space is formed Is detachably mounted, and the camera housing is mounted such that the base member comes into contact with the upper surface portion of the casing, and a screw is screwed from the contact surface side of the base member to the upper surface portion of the casing. the cover member and the base member and are connected, the base member is extended to a position covered by the engine cover by this It is an its characterized in that at least one position of the screw in the region covered has a structure which is connected to the casing upper surface by Njinkaba.

  The camera housing is intended to protect the camera housed in the device from being stolen and to prevent damage caused by flying rocks or the like, and therefore must have high strength. For this purpose, the camera housing is preferably made of a metal material such as a steel plate. However, it is necessary to form an opening in the camera housing in order to ensure an external visual field necessary for the camera housed in the camera housing. This opening is for securing the field of view of the camera provided in the camera housing, and has a minimum size necessary for the purpose. Then, a transparent plate such as a transparent resin or glass is attached to the opening as necessary. Further, the transparent plate can be provided on the camera side. Further, the opening is formed in either the base member or the cover member, or in a portion from the base member to the cover member. When the camera is configured to be supported by the base member, it is reasonable to provide the opening in the base member. Although the objective lens of the camera is disposed so as to face the opening, a wider field of view is ensured if it is disposed at a position close to the opening.

In order to attach and detach the camera housed in the camera housing, the camera housing has a structure that can be disassembled. This is the reason why the camera housing includes the base member and the cover member. The base member extends to a position covered with the engine cover, and is screwed into at least one portion covered with the engine cover to be connected and fixed to the upper surface of the casing. Then, in order to stabilize the camera housing and prevent it from flapping, one or more screws are screwed into other locations, that is, the portion not covered with the cover member or the upper position of the cover member. Thus, the camera housing can be stably held. Therefore, the base member needs to have a dimension from a position where the camera is mounted to the inside of the engine cover, and has a shell structure having a housing space for the camera inside by the base member and the cover member. Therefore, the base member is formed of two members, and includes a base member body that forms a shell structure together with the cover member, and a mounting plate that is detachably fixed to the base member body. It is desirable to have a configuration in which they are attached so as to be in contact with each other . Then, in the casing of the counterweight, a concave groove reaching a portion covered by the engine cover can be formed in a portion covered by the mounting plate, and this concave groove can be used as a path for routing the wiring from the camera. Further, a through hole for taking out the wiring is formed in the base member of the camera housing, and the wiring is inserted into the inside of the concave groove from the through hole.

  By configuring in this way, it is possible to take measures to prevent theft of a camera used for rear monitoring without performing a slight process such as a bolt insertion part in a casing of a machine room or a counterweight. The effect of.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, FIG. 1 shows an overall configuration of a hydraulic excavator as an example of a construction machine. In the figure, 1 is a lower traveling body, and 2 is an upper revolving body installed on the lower traveling body 1 so as to be able to swivel. A working means 3 for performing work such as excavation is mounted on the upper swing body 2, and a cab 4 is also provided in the working means 3. A machine room building 5 is disposed at the rear position of the cab 4, and a counterweight 6 is installed at the rear position of the machine room building 5.

  As is clear from FIG. 1, in this hydraulic excavator, a rear visual field cannot be obtained from the cab 4. Therefore, for example, in order to ensure safety when the vehicle is moving backward, a rear monitoring device is provided for the operator to supplementarily acquire the rear visual field. The rear monitoring apparatus includes a camera unit 10 and a monitor 11 that displays a rear visual field image obtained by the camera unit 10. The camera unit 10 is disposed above the counterweight 6 in the upper swing body 2 and is mounted so that the field of view is directed rearward. On the other hand, the monitor 11 is mounted in the cab 4.

  Next, in FIG. 2, the plane of the site | part from the machine room building 5 to the counterweight 6 in the upper turning body 2 is shown. In this figure, 20 is a casing upper surface portion of the counterweight 6, 21 is an upper cover of the machine room building 5, and 22 is an engine cover. Equipment such as an engine is installed inside the machine room building 5, and a heat exchanger such as a radiator is connected to the engine. The engine cover 22 covers the upper part of the installation part of the engine, and in order to perform maintenance of the engine and the like, it constitutes an opening / closing cover that can be opened / closed in the vertical direction around the one side part 22a. Yes. Therefore, the part covered with the engine cover 22 in the upper cover 21 of the machine room building 5 is an opening 21a. Moreover, the engine cover 22 extends from the machine room building 5 to the position of the casing upper surface portion 20 of the counterweight 6 and is in contact with the casing upper surface portion 20.

  Furthermore, FIG. 3 shows a configuration example of the camera unit 10. As is apparent from this figure, the camera unit 10 is constituted by housing a camera holder 32 with a camera 31 mounted therein in a camera housing 30. The camera housing 30 includes a cover member 33 and a base member 34 joined to the cover member 33. The base member 34 includes a base member main body 35 and a mounting plate 36. The camera 31 attached to the camera holder 32 is fixed in a cavity formed by the cover member 33 and the base member main body 35 of the base member 34. Therefore, the camera 31 is housed in a space formed by the cover member 33 and the base member main body 35, and the camera housing 30 is provided in the camera housing 30 by the cover member 33 and the base member main body 35. It is formed.

  As is apparent from FIG. 4, the camera holder 32 is fixed to a pair of left and right brackets 37, 37 fixed to the base member main body 35 with bolts 38. An opening 35 a is formed in the end surface portion of the base member main body 35, and the opening 35 a constitutes a light transmitting portion for acquiring the field of view of the camera 31. The front end surface of the camera holder 32 is mounted so as to come into contact with the periphery of the opening 35a, and a transparent plate 39 made of glass, plastic, or the like is mounted on a portion facing the opening 35a. The objective lens portion 31a of the camera 31 is held in a state with a predetermined distance from the transparent plate 39.

  The camera housing 30 houses the camera 31 therein, and is protected so that the camera 31 is not damaged even if it collides with a flying object such as a rock or a fixed object such as a tree or a structure, and prevents theft. Therefore, the entire camera housing 30, that is, the cover member 33 and the base member 34 are made of a highly rigid metal material. The cover member 33 constituting the camera housing 30 is detachably connected to the base member main body 35 constituting the base member 34, and the base member main body 35 is detachably connected to the mounting plate 36. Further, the mounting plate 36 is detachably fixed to the casing upper surface portion 20 of the counterweight 6 (part of which may be covered with the upper cover 21).

  In order to detachably connect the cover member 33 to the base member main body 35, a connecting plate 40 made of a bent metal plate is provided by welding means on the inner surface of the cover member 33. Here, in the structure shown in the figure, the connecting plate 40 is formed at two locations. However, if the cover member 33 is connected to the base member main body 35 by the bolts 42 at least at two locations, preferably at least three locations. The number and shape of the connecting plates are arbitrary. When the cover member 33 is fitted to the base member main body 35, the connection plate 40 has a contact surface portion 40a that contacts the inner surface of the base member main body 35, and a bolt is inserted into the contact surface portion 40a. A hole is formed and a nut 41 is fixed by welding so as to surround the hole.

  On the other hand, the cover member 33 is detachably connected to the base member main body 35 by inserting the bolt 42 from the lower surface side of the base member main body 35 and screwing it into the nut 41. Therefore, the bottom surface portion of the base member main body 35 is a raised portion 35b formed in a convex shape over a predetermined range, and a bolt 42 is mounted at a position in the raised portion 35b. Therefore, the step of the raised portion 35b substantially corresponds to the thickness of the head of the bolt 42 and the nut 45 described later, or has a step size with a drop from them.

  A base member main body 35 constituting the base member 34 is detachably connected to the mounting plate 36. The base member main body 35 and the mounting plate 36 are connected using bolts 44. For this purpose, the base member main body 35 is provided with a through hole through which the bolt is inserted, and a nut 43 is provided on the back side thereof. It is fixed by welding means. Therefore, the base member main body 35 and the mounting plate 36 are fixed in a connected state by screwing bolts 44 into the nuts 43 from above.

  The attachment plate 36 is detachably fixed to the casing upper surface portion 20 of the counterweight 6 at a plurality of places, for example, four places. Here, the casing of the counterweight 6 is filled with cement or the like as a heavy object, but at least about several percent to tens of percent on the upper side is a space. Therefore, the nut 45 is welded to the inside of the packing storage portion of the casing upper surface portion 20, and the mounting plate 36 is screwed into the nut 45 from the upper surface side of the mounting plate 36, so that the mounting plate 36 is The unit 20 is detachably fixed. Here, the mounting portion of the two bolts 46 </ b> A is mounted on the cover member 33, and is located on the side constituting the housing portion of the camera 31 together with the base member main body 35. The end portion of the mounting plate 36 enters the engine cover 22, and the other two bolts 46 </ b> B are located at a portion covered by the engine cover 22.

  Therefore, as shown in FIG. 5, the mounting plate 36 is an area F in which the housing portion 30 a of the camera housing 30 formed by the cover member 33 and the base member main body 35 is arranged at one end side. The site is wider. Two bolts 46 </ b> A are attached to the bolt insertion holes 47 provided at positions that are wide portions and avoid the region F. The other end side of the wide portion is a narrow portion. The other end side of the mounting plate 36 is a region B covered with the engine cover 22. The bolt insertion hole 47 to which the bolt 46B is attached is located in this region B. The camera unit 10 is stably held by these four bolts 46A and 46B.

  As is apparent from FIG. 5, the mounting plate 36 is larger than the shafts of the bolts 46A and 46B and larger than the shafts of the bolt insertion holes 47 and the bolts 44 having dimensions smaller than those bolt heads. A small-sized bolt insertion hole is formed, and a nut 43 is fixedly provided. Further, since the bolt 42 for connecting the cover member 33 and the base member main body 35 is disposed in the region F, a through hole 48 having a larger diameter than the head of the bolt 42 is formed.

  Further, although the wiring 50 is connected to the camera 31, since the processing circuit for the video signal from the camera 31 and the monitor 11 are provided in the cab 4, the wiring 50 is routed to the cab 4. I have to do it. The wiring 50 extends from the cab 4 through the interior of the machine room building 5 to the position of the counterweight 6. Since the camera housing 30 is mounted on the casing upper surface portion 20 of the counterweight 6, the wiring 50 is led out from the machine room building 5 and connected to the camera housing 30. The camera housing 30 has a mounting plate 36, one end of the mounting plate 36 enters the inside of the engine cover 22, and the base member main body 35 is in contact with the upper part of the other end. Therefore, a concave groove 51 is formed in a portion of the casing upper surface portion 20 where the mounting plate 36 abuts, and the wiring 50 extending to the end of the machine room building 5 is accommodated in the concave groove 51. . The mounting plate 36 and the base member main body 35 are respectively provided with insertion holes 52 and 53, and the wiring 50 is drawn into the camera housing space 30 a of the camera housing 30 through the insertion holes 52 and 53. . As a result, the wiring 50 from the camera 31 is not exposed to the outside, damage caused by the collision object is not generated, and the appearance is good.

  The camera unit 10 is configured as described above. Next, a method for mounting the camera unit 10 will be described with reference to FIGS. First, a camera holder 32 is mounted on a bracket 37 provided on the base member main body 35, and the camera 31 is incorporated in the camera holder 32. Then, the wiring 50 from the camera 31 is inserted into the insertion hole 53 formed in the base member main body 35.

  In the above state, as shown in FIG. 6, the base member 34 is first assembled by connecting the base member main body 35 to the mounting plate 36. This assembly is performed by screwing the bolt 44 into the nut 45. The bolt 44 is screwed from the upper side in the figure, that is, from the inner surface side of the base member main body 35. In connection with this connection, the wiring 50 is inserted through the insertion hole 52. The nut 45 may be provided on the base member main body 35 side. In this case, the bolt 44 is screwed from the lower side in the drawing. Further, the base member main body 35 and the mounting plate 36 can be configured as a single body without necessarily being detachably connected.

  Next, as shown in FIG. 7, the housing member 30 a that houses the camera 31 is formed in the camera housing 30 by fitting the cover member 33 to the base member body 35. Then, the connecting member 40 of the cover member 33 is brought into contact with the inner surface of the base member main body 35, and the bolt 42 is screwed into the nut 41 from the lower surface side of the base member main body 35, whereby the cover member 33 is fixed to the base member main body 35. Connect to Thus, the camera unit 10 in which the camera 31 is accommodated in the camera housing 30 is assembled. Here, since the base member main body 35 is already connected to the mounting plate 36 in a stage before being connected to the cover member 33, the mounting plate 36 has a hole diameter through which the head of the bolt 42 can be inserted. When the through holes are formed and the bolts 42 are actually fixed, the bolts 42 are inserted from the back side of the mounting plate 36 and screwed into the nuts 41.

  Further, as shown in FIG. 8, the wiring 50 extending to the lower side of the mounting plate 36 is inserted into the recessed groove 51 formed in the casing upper surface portion 20, and the mounting plate 36 is inserted into the casing upper surface portion 20. Make contact. Since a part of the mounting plate 36, that is, the region B is located in the engine cover 22, the engine cover 22 is opened in advance.

  When the mounting plate 36 is disposed at a predetermined position, the mounting plate 36 is fixed to the casing upper surface portion 20 by bolts 46A and 46B. Thereafter, the engine cover 22 is closed. Here, since the engine cover 22 is provided with a key 23, the key 23 is to be engaged. As a result, the camera unit 10 is installed on the counterweight 6 as shown in FIG. In the assembled state of the camera unit 10, the wiring 50 is not exposed to the outside.

  By assembling as described above, the camera 31 can be prevented from being stolen. Since the camera 31 is located in the housing portion 30a of the camera housing 30 and is covered with a cover member 33 and a base member 34, both of which are formed of a metal material, the cover member 33 or the base member 34 is damaged. The camera 31 cannot be taken out.

  The camera unit 10 can be disassembled from the viewpoint of the necessity of maintenance. Therefore, the camera 31 can be taken out by separating the cover member 33 and the base member main body 35. However, the bolt 42 that connects the cover member 33 and the base member main body 35 does not appear on the surface side of the camera unit 10, and the bolt 42 faces the contact surface side to the casing upper surface portion 20. The camera 31 cannot be taken out unless the entire unit 10 is separated from the casing upper surface portion 20.

  Since the mounting plate 36 is fixed to the casing upper surface portion 20 with bolts 46A and 46B, the entire camera unit 10 cannot be separated from the casing upper surface portion 20 unless these bolts 46A and 46B are removed. Since the bolt 46A is exposed to the outside, it can be easily detached. However, the bolt 46B is located inside the engine cover 22, and the engine cover 22 is locked with the key 23. For this reason, the bolt 46B cannot be detached unless the key 23 is opened. That is, the camera unit 10 cannot be separated from the upper swing body 2 unless the key 23 is opened and the engine cover 22 is opened. That is, the camera 31 can be prevented from being stolen.

  Here, as shown in FIG. 5, the engine cover 22 overlaps the casing upper surface portion 20 of the counterweight 6 over a large width, and the overlapped portion is used as a fastening portion of the bolt 46 </ b> B. Here, the projecting width of the engine cover 22 to the casing upper surface portion 20 depends on the protruding amount of the upward protruding portion from the upper cover 21 inside the engine cover 22 and the distance to the end surface of the casing upper surface portion 20. In FIG. 5, the heat exchanger H is higher than the upper cover 21 and is in a position close to the counterweight 6. By using such a large heat exchanger H, the heat exchange efficiency can be increased. From the viewpoint of maintaining the strength of the engine cover 22, it is necessary to suppress the rising angle. Therefore, when the engine cover 22 is inclined at a certain inclination angle from the height position of the heat exchanger H, the engine cover 22 protrudes greatly from the casing upper surface portion 20. The bolt 46B is arranged inside the engine cover 22 protruding in this manner.

1 is an overall configuration diagram of a hydraulic excavator as an example of a construction machine equipped with a rear monitoring device according to the present invention. It is a principal part top view of FIG. It is sectional drawing of a camera unit. It is sectional drawing which shows the structure of the camera mounting part in a camera unit. It is explanatory drawing which shows each area | region in the plane of a mounting plate. It is sectional drawing which shows the assembly process of a base member. It is sectional drawing which shows the process of connecting a cover member to a base member. It is sectional drawing which shows the process of mounting the camera unit 10 on the casing upper surface part of a counterweight.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 4 Operator's room 5 Machine room building 6 Counterweight 10 Camera unit 11 Monitor 20 Casing upper surface part 21 Upper cover 22 Engine cover 23 Key 30 Camera housing 30a Housing part 31 Camera 31a Objective lens part 32 Camera holder 33 Cover member 34 Base member 35 Base member main body 36 Mounting plate 39 Transparent plate 40 Connecting plates 41, 43, 45 Nut 42, 44, 46A, 46B Bolt 50 Wiring 51 Groove 52, 53 Insertion hole

Claims (4)

In order to obtain the field of view behind the construction machine, a camera is installed on the upper surface of the casing of the counterweight, and a construction machine rear monitoring device configured to install a monitor that displays an image acquired by the camera in the cab,
A camera housing comprising a cover member and a base member that are detachably connected to each other on the casing upper surface, and in which a camera housing space is formed is detachably mounted.
The camera housing is mounted so that the base member comes into contact with the upper surface portion of the casing, and the cover member and the base are screwed in by screwing a screw from the contact surface side of the base member to the upper surface portion of the casing The parts are connected,
A construction machine characterized in that the base member extends to a position covered by an engine cover and is connected to the upper surface of the casing by at least one screw at a portion covered by the engine cover. Rear monitoring device. Wherein said base member is in the upper position of the cover member by uncovered portion or the cover member, characterized by being configured to interpolate screw one or more portions of the screw and relative to the casing top section Item 1. A construction machine rear monitoring apparatus according to Item 1. The base member includes a base member body consists of a detachably fixed mounting plate to the base member body, that is configured to be mounted so as to cause contact with the mounting plate to the casing top section The rear monitoring device for a construction machine according to claim 1 or 2, characterized by the above-mentioned. The casing is formed with a concave groove reaching a portion covered by the engine cover at a portion covered by the mounting plate, a through hole is formed in the base member, and the wiring connected to the camera is The rear monitoring device for a construction machine according to claim 3, wherein the through-hole is inserted into the concave groove.

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