JP6104128B2 - Construction equipment cab roof panel structure - Google Patents

Description

  The present invention relates to a roof panel structure of a construction machine cab having a skylight.

  As shown in FIG. 8, some construction machinery cabs having a skylight 13 are manufactured by separately welding the outer periphery of the roof panel 20 to the cab body 1 after separately manufacturing the roof panel 20 and the cab body 1. .

  In the case where the skylight 13 is provided in such a construction machine cab, it is formed by drilling the window hole 6 leaving the middle rail 7 so that the window hole 6 is arranged in advance in the skylight pasting place 5 of the roof panel 20 before being attached to the cab body 1. After that, the roof panel 20 is circumferentially welded to the top 3 of the cab body 1 and the skylight 13 is attached to the roof panel 20 with an adhesive. In general, the roof panel 20 of the construction equipment cab is required to have strength to withstand falling rocks, and the middle rail 7 contributes to the improvement of the strength of the roof panel 20.

Japanese Patent No. 3180325

  By the way, the roof panel 20 is circumferentially welded to the top 3 of the cab body 1 and the intermediate rail 7 is formed integrally with the roof panel 20, so the roof panel 20 is welded to the cab body 1. There was no escape in the welding distortion at the time, and the central part of the middle rail 7 was bent and sometimes deformed in the vertical direction. When the center part of the middle beam 7 is deformed upward, the middle beam 7 interferes with the skylight 13 and affects the waterproof performance. Moreover, when the center part of the middle rail 7 deform | transforms below, the clearance gap between the middle rail 7 and the skylight 13 will become large, and the appearance from a room will deteriorate.

  The objective of this invention is providing the roof panel structure of the construction machine cab which can prevent the deformation | transformation of the up-down direction of the middle rail by welding distortion.

  In order to achieve the above-mentioned object, the present invention forms a window hole by leaving an intermediate rail so that a plurality of window holes are arranged at a roof window affixing portion of the roof panel, and then the roof panel is formed on the cab body. In the roof panel structure of the construction machine cab formed by circumferential welding on the top, one side of the longitudinal direction of the middle rail is cut off from the roof panel and a gap is formed therebetween, and the roof panel is circumferentially welded to the cab body. After that, the separated intermediate beam and roof panel are joined and welded together with a plate.

  The gap may be formed in a bowl shape so that a cut end portion of the middle rail extends to the roof panel side.

  The connecting plate may be formed wider than the middle rail, and an outer peripheral edge of the connecting plate may be welded to the middle rail and welded to the roof panel.

  A weather strip is provided in an annular shape on the roof panel and the intermediate beam facing the window hole, and a skylight is disposed so as to cover the plurality of window holes from above, and is in close contact with the weatherstrip, and an outer peripheral portion of the skylight May be adhered to the roof panel.

  According to the roof panel structure of the construction machine cab of the present invention, it is possible to prevent the middle rail from being deformed in the vertical direction due to welding distortion.

(A) is a top exploded view of the construction machine cab according to the embodiment of the present invention, and (b) is an enlarged view of a main part of (a). It is the whole construction machine cab perspective view. FIG. 3 is a partial end view taken along line AA in FIG. 2. (A) is a perspective view of the roof panel before welding to a cab main body, (b) is a principal part enlarged view of (a). (A) is explanatory drawing of the process of welding a connecting plate to a middle crosspiece, (b) is explanatory drawing of the process of welding a connecting plate to a roof panel. It is explanatory drawing of the process of affixing a skylight on a roof panel. It is a principal part enlarged view of the middle crosspiece which shows other embodiment. It is explanatory drawing which shows the conventional roof panel structure.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the following embodiments, front, rear, left and right are based on the front and rear of the construction machine cab. For example, the front direction is referred to as the front, the rear direction is referred to as the rear, and the left and right are referred to as the left and right for the operator who enters the construction machine cab and faces the front.

  As shown in FIGS. 1 and 2, the construction machine cab is assembled by separately welding the cab body 1 and the roof panel 2 and then welding the roof panel 2 to the top 3 of the cab body 1. It is performed by welding continuously or intermittently.

  The cab body 1 is formed by assembling a steel pipe or the like in a box shape to form a frame 4 and attaching the panels P to the frame 4 as front, rear, left and right wall surfaces. The frame 4 at the top 3 of the cab body 1 is formed in a frame shape so as to surround an outer periphery of a roof panel 2 described later.

  As shown in FIG. 4A, the roof panel 2 is manufactured by forming three window holes 6 and two middle rails 7 at the skylight pasting place 5 of the roof panel 2. The skylight pasting location 5 is located at the front end of the roof panel 2. The window hole 6 and the middle beam 7 are formed by punching the window hole 6 while leaving the middle beam 7 so that the plurality of window holes 6 are arranged in the skylight pasting place 5 of the roof panel 2 by punching or the like. At this time, the window holes 6 are formed in a rectangular shape and aligned in the left-right direction at equal intervals, and the front edges 8 of the window holes 6 are formed on the same straight line.

  Further, as shown in FIG. 4 (b), when the window hole 6 is made in the roof panel 2, the front part of each middle rail 7 is separated from the roof panel 2 and between the separated middle rail 7 and the roof panel 2. A gap 9 is formed. The gap 9 is formed in the roof panel 2 in front of the front edge 8 of the window hole 6, and the cut end portion 10 of the middle rail 7 is extended to the roof panel 2 side in front of the front edge 8 of the window hole 6. It is formed in a bowl shape. Specifically, the gap 9 is formed in a U shape in plan view. As a result, the cut end 10 of the intermediate rail 7 becomes convex with respect to the front end F of the roof panel 2. A gap 9 formed in front of each middle rail 7 connects the three window holes 6 into one hole. As a result, when the roof panel 2 is circumferentially welded to the cab body 1, the roof panel 2 is freely deformed while the intermediate rail 7 itself is not deformed. The gap 9 allows displacement of the cut end 10 and absorbs welding distortion of the roof panel 2. Further, the gap 9 is formed in a bowl shape to facilitate the positioning of the middle rail 7.

  Although the front portion of the middle rail 7 is separated from the roof panel 2, one of the longitudinal directions (front-rear direction) of the middle rail 7 may be separated from the roof panel 2. Specifically, the rear portion of the middle rail 7 may be separated from the roof panel 2 and the gap 9 may be formed therebetween. In this case, the gap 9 is preferably formed in a bowl shape so as to extend the cut end portion 10 of the intermediate rail 7 backward. The window hole 6 is preferably formed so that the rear edges 11 are aligned on a straight line. Further, the shape of the gap 9 is not limited to a U-shape, and may be another bowl shape such as an arc shape or a V-shape. Furthermore, when the positioning of the middle rail 7 is unnecessary, the gap 9 may be linear as shown in FIG. In this case, the gap 9 is formed so that the position of the front edge is collinear with the front edge 8 of the window hole 6 (the rear edge 11 of the window hole 6 when the rear portion of the middle rail 7 is cut off). Good.

  When the roof panel 2 is circumferentially welded to the cab body 1, as shown in FIGS. 5A and 5B, the separated intermediate rail 7 and the roof panel 2 are welded and joined by the connecting plate 12. Specifically, the connecting plate 12 formed wider than the middle rail 7 is disposed so as to cover the gap 9 from above, and the outer periphery of the connecting plate 12 is welded to the middle rail 7 and welded to the roof panel 2. The crosspiece 7 and the roof panel 2 are joined. After the connecting plate 12 is welded to the middle rail 7, the connecting plate 12 is welded to the roof panel 2. At this time, the roof panel 2 may be distorted by circumferential welding with the cab main body 1, but the middle rail 7 is separated from the roof panel 2 through the gap 9, so the cut end portion 10 of the middle rail 7. However, the distortion can be absorbed by displacing within the range of the gap 9, and the bending occurring in the central portion in the longitudinal direction of the middle rail 7 can be reduced or not generated. As a result, the shape of the intermediate rail 7 can be made stable and substantially constant. In addition, by forming the connecting plate 12 wider than the middle rail 7, the strength of the joint portion between the roof panel 2 and the middle rail 7 can be ensured. The connecting plate 12 is welded to the upper surfaces of the middle rail 7 and the roof panel 2, but may be welded to the lower surfaces of the middle rail 7 and the roof panel 2.

  Then, as shown in FIG. 6, the skylight 13 is affixed to the skylight pasting location 5 of the roof panel 2. Specifically, as shown in FIG. 3, a weather strip 14 is provided in an annular shape on the roof panel 2 and the intermediate rail 7 facing the window hole 6, and the skylight is formed on the roof panel 2 so as to cover the plurality of window holes 6 from above. 13, and the outer peripheral portion of the skylight 13 is bonded to the roof panel 2 via an adhesive 15. The weather strip 14 is formed in a U-shaped cross section, and accommodates the roof panel 2 and the middle rail 7 together with the plate 12 inside the U-shape. Since the middle beam 7 is not deformed in the vertical direction, the middle beam 7 interferes with the skylight 13 and the waterproof performance is lowered, or the gap with the skylight 13 becomes larger and the appearance from the room deteriorates. There is no, and the water stop and interior texture of the skylight 13 can be improved.

  In this way, one of the middle rails 7 in the longitudinal direction is separated from the roof panel 2 and a gap 9 is formed therebetween. The roof panel 2 is circumferentially welded to the cab body 1 and then the separated middle rail 7 and roof panel 2 are separated. Since the connecting plate 12 is welded and joined, it is possible to prevent the middle rail 7 from being deformed in the vertical direction due to welding distortion with a simple structure.

  Further, since the gap 9 is formed in a bowl shape so that the cut end portion 10 of the intermediate beam 7 extends toward the roof panel 2, the plate 12 connects the cut end portion 10 of the intermediate beam 7 and the roof panel 2. It is easy to position when welding with.

  The connecting plate 12 is formed wider than the middle rail 7, and the outer peripheral edge of the connecting plate 12 is welded to the middle rail 7 and welded to the roof panel 2. The roof panel 2 can be firmly joined with a simple structure. And the intensity | strength of the roof panel 2 is securable.

  A weather strip 14 is provided in an annular shape on the roof panel 2 and the middle rail 7 facing the window hole 6, and a skylight 13 is disposed so as to cover the plurality of window holes 6 from above, and is in close contact with the weatherstrip 14. Since the outer peripheral portion of 13 is bonded to the roof panel 2, the waterproof property between the skylight 13 and the roof panel 2 can be secured even when the intermediate rail 7 and the roof panel 2 are joined and welded together by the plate 12.

DESCRIPTION OF SYMBOLS 1 Cab body 2 Roof panel 3 Top part 5 Skylight pasting place 6 Window hole 7 Middle rail 9 Gap 10 Cutting edge part 12 Connecting plate 13 Skylight 14 Weather strip

Claims (4)

A construction machine cab that is formed by drilling a window hole leaving a middle rail so that a plurality of window holes are arranged at the roof window affixed portion of the roof panel, and then forming the roof panel by circumferential welding to the top of the cab body. In the roof panel structure,
One of the middle rails in the longitudinal direction is separated from the roof panel and a gap is formed between them. After the roof panel is circumferentially welded to the cab body, the separated middle rail and the roof panel are welded and joined by a connecting plate. A construction machine cab roof panel structure.   The roof panel structure of a construction machine cab according to claim 1, wherein the gap is formed in a bowl shape so that a cut end portion of the middle rail extends to the roof panel side.   The roof of the construction machine cab according to claim 1 or 2, wherein the connecting plate is formed wider than the middle rail, and an outer peripheral edge of the connecting plate is welded to the middle rail and welded to the roof panel. Panel structure.   A weather strip is provided in an annular shape on the roof panel and the intermediate beam facing the window hole, and a skylight is disposed so as to cover the plurality of window holes from above, and is in close contact with the weatherstrip, and an outer peripheral portion of the skylight The roof panel structure of the construction machine cab according to any one of claims 1 to 3, wherein the roof panel is bonded to the roof panel.