JP2014125281A - Manufacturing method of car body weight and car body weight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a car body weight for easily manufacturing the car body weight of projecting an installation bracket above and below a side surface, and the car body weight.SOLUTION: A weight body 21 is formed by welding-joining by successively laminating a plurality of iron plate-like bodies 21a, 21b, 21c, 21d, 21e and 21f different in a size in order of successively becoming small from the large iron plate-like body in the size, and after welding-joining a first bracket 22 to one side upper part of the weight body, a second bracket 23 is welded-joined to the one side upper part of the weight body of becoming an upper position by vertically reversing the weight body, and a suspension member 24 is welded-joined to an upper surface of the weight body, and a decorative sheet 25 for covering a side surface of the weight body is respectively welded-joined to the side edge of the largest iron plate-like body in the size.

Description

  The present invention relates to a car body weight manufacturing method and a car body weight, and more particularly to a car body weight manufacturing method and a car body weight structure that are detachably attached to a lower traveling body of a crawler crane.

  The crawler crane is configured such that an upper swing body is turnably provided on an upper portion of a lower traveling body provided with a crawler, and a boom is supported on the upper swing body so as to be raised and lowered. In addition, a car body weight for improving balance and sudden release ability is mounted (see, for example, Patent Document 1). Further, as a counterweight to be mounted on the upper revolving unit of a crawler crane, a plurality of steel plates such as slab materials that are overlapped and welded together and covered with a decorative plate is known (for example, Patent Document 2). reference.).

JP 2012-111618 A Japanese Patent No. 3273246

  However, in the case of the counterweight mounted on the upper swing body, it can be easily manufactured with the structure described in Patent Document 2, but the carbody weight is attached to the front or rear surface of the carbody via a bracket. Therefore, it is necessary to project mounting brackets above and below the side of the car body weight, and the mounting bracket is subject to tensile stress due to the weight of the car body weight and bending moment due to the length of the mounting bracket, etc. Therefore, it is necessary to firmly join the body portion of the car body weight and the mounting bracket. Further, when a car body weight is manufactured with the same structure as the counterweight described in Patent Document 2, there is a problem in workability when welding the mounting bracket.

  Accordingly, an object of the present invention is to provide a car body weight manufacturing method and a car body weight capable of easily manufacturing a car body weight having a shape in which mounting brackets are protruded from the upper and lower sides.

  In order to achieve the above object, a car body weight manufacturing method according to the present invention is a car body weight manufacturing method to be mounted on a car body of a crawler crane. A plurality of other iron plate bodies are sequentially stacked on the upper surface of the largest iron plate body in the order of decreasing size from the largest iron plate body, and the upper and lower adjacent iron plate bodies are A weight main body forming step for forming a weight main body in which a plurality of iron plate bodies are integrated by welding and welding, and a first bracket for connecting a car body projecting to one side is welded to one upper portion of the weight main body. The first bracket welding process to be joined, the weight body reversing process in which the upper and lower sides of the weight body are reversed to place the largest steel plate-like body at the top, and A second bracket welding process in which a second bracket for car body connection protruding to one side is welded and joined to one side upper part of the weight body that is higher, A lifting member welding process that welds and joins lifting members for lifting car body weights, and a decorative sheet welding process that welds and joins the decorative plates that cover the sides of the weight body to the side edges of the largest steel plate-like body. It is characterized by being performed.

  Further, the car body weight of the present invention is a car body weight attached to the car body of a crawler crane, in which a plurality of iron plate bodies having different sizes are stacked in order of increasing size from the lower order and adjacent in a stacked state. Welded to the weight body welded to the steel plate, the first bracket for car body connection that is welded and joined to the lower part on one side of the weight body, and the upper part on one side of the weight body The second bracket for connecting the car body that is joined and protrudes to one side, the lifting member for lifting the car body weight welded to the upper surface of the weight body, and the side edge of the largest steel plate-like body And a decorative plate that is welded and covers the side surface of the weight body.

  According to the present invention, the iron plate-like body having the largest size at the top after completion is placed at the bottom, and the iron plate-like body having the largest size is laminated in order from the small iron plate-like body. As a result, the weight body can be easily welded. Further, since the first bracket located at the lower portion after completion in this state is welded to the weight main body, the welding work of the first bracket can be easily performed. Then, after the first bracket is joined, the weight main body is turned upside down and the second bracket, which is an upper part after completion, is welded to the weight main body, so that the second bracket can be easily welded. In addition, since the decorative plate is welded and joined to the side edge of the iron plate having the largest size after inversion, the decorative plate can be easily welded. By these, each welding joining can be performed reliably and the joining strength of each iron plate-shaped body and each bracket can fully be ensured.

  In addition, since the side of the weight body is covered with a decorative plate, the appearance of the car body weight is also good, and it is not necessary to precisely control the dimensional accuracy and the roughness of the cut edge when cutting each iron plate-like body. Since the cutting speed can be increased and the finishing of the cut surface is unnecessary, the manufacturing process can be simplified and the processing time can be shortened. Further, since the lifting member for lifting the car body weight is welded to the upper surface, the car body weight can be easily transported or attached to the car body.

It is a partial cross section side view of the car body weight of the state with which the car body which shows the example of 1 form of this invention was mounted | worn. It is a top view of the car body weight of the state similarly mounted in the car body. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is explanatory drawing which shows the process before the weight main body inversion process in the manufacturing process of a car body weight. It is explanatory drawing which shows the process after the weight main body inversion process in the manufacturing process of a car body weight. It is a top view of the lower traveling body of a crawler crane. It is a side view of a lower traveling body similarly. It is a side view of a crawler crane.

  First, as shown in FIG. 8, the crawler crane 11 includes a lower traveling body 12 and an upper revolving body 13 that is pivotably provided on the upper portion of the lower traveling body 12. In the center, there is an equipment room (engine room) 13a equipped with an engine, a hydraulic pump, etc., and a plurality of winches (not shown) each wound with a main winding rope 14a, an auxiliary winding rope 14b, and a hoisting rope 14c. A boom 15 that can tilt in the front-rear direction and a cab 13b are provided at the front, and a plurality of counterweights 16 are placed on the base 13c at the rear.

  As shown in FIGS. 6 and 7, the lower traveling body 12 is mounted on a car body 17 having a swivel bearing 17a at the center upper portion, and a pair of axles 18a and a crawler expansion / contraction cylinder 18b on both sides of the car body 17. Crawler 18. Jack brackets 17b are respectively provided at both front and rear end portions of the car body 17, and the base portions of jack arms 19a each having a jack 19 attached to the front end of the jack bracket 17b are rotatable. In addition, an upper connection arm 17c for mounting the car body weight 20 is provided on the inner upper side of each jack bracket 17b. Further, a lower connecting arm 17d for mounting the car body weight 20 is provided at the front lower center and the rear lower center of the car body 17, respectively.

  As shown in FIG. 1 to FIG. 3, the car body weight 20 is formed by stacking six flat rectangular iron plate bodies 21a, 21b, 21c, 21d, 21e, and 21f having different sizes and adjoining each other vertically. A weight main body 21 formed by welding and joining iron plate-like bodies, a first bracket 22 provided at the lower center of one side of the weight main body 21, and two ends of the upper side of the one side of the weight main body 21 are provided. The second bracket 23 is formed, two lifting members 24 provided on the upper surface of the weight body 21, and a decorative plate 25 that covers the side surface of the weight body 21.

  The iron plate-like bodies 21a to 21f have the same thickness and have shapes in which the vertical and horizontal dimensions become smaller in order. When the iron plate-like bodies 21a to 21f are stacked in order of size, welding is performed on the four side portions. For example, the vertical and horizontal dimensions are set to be reduced by 20 mm so that a step having a width that can be easily performed is generated. In addition, the thickness of the iron plate-like bodies 21a to 21f is arbitrary, but if the thickness is small, the number of sheets increases and the number of welding processes also increases. Therefore, the thickness is usually about 100 mm that is commercially available as a general product. It is preferable to use an iron bulk material. What is necessary is just to set the vertical and horizontal maximum dimension of an iron plate-shaped object according to the space of the part which mounts the car body weight 20. FIG. The decorative plate 25 may be an iron plate (steel plate) having a thickness of about 10 mm that is generally sold as a thick plate.

  As shown in FIG. 4, the car body weight 20 is manufactured by placing the iron plate 21a having the largest size at the lowermost position and placing the iron plate having the next largest size on the iron plate 21a. The body 21b is laminated so as to provide a welding step 26a around each of the four sides. Furthermore, the iron plate-like body 21c having the next largest size is laminated on the iron plate-like body 21b, and all the iron plate-like bodies 21a to 21f are laminated in the order of decreasing size. And when each iron plate-like body is laminated, or after all the iron plate-like bodies are laminated, the welding step 26a formed around the iron plate-like bodies adjacent vertically is welded and joined. Then, a weight main body forming step for forming a weight main body 21 in which the six iron plate-like bodies 21a to 21f are integrated is performed. Then, the 1st bracket welding process of welding and joining the 1st bracket 22 for the car body connection which protrudes to one side in the center of one side upper part of the weight main body 21 is performed.

  Next, the weight main body 21 that has finished the first bracket welding process is lifted by a crane using the first bracket 22, and as shown in FIG. The second bracket welding step of welding and joining two car body connecting second brackets 23 projecting one side to a predetermined position on one side upper part of the weight body 21 which is the upper level is reversed. A lifting member welding process is performed in which the two lifting members 24 for lifting the car body weights are welded and joined to predetermined positions on the upper surface of the weight body 21 that is the upper rank.

  Finally, a decorative plate welding process is performed in which the decorative plate 25 covering the side surface of the weight main body 21 is welded and joined to the side edge of the iron plate-like body 21a having the largest inverted size. At this time, a cutout portion 25a corresponding to the first bracket 22 and a cutout portion 25b corresponding to the second bracket 23 are formed in advance on the decorative plate 25 attached to the side portion provided with the first bracket 22 and the second bracket 23. Keep it. Further, when the decorative plate 25 is welded to the side edge of the iron plate-like body 21a, the upper end of the decorative plate 25 is disposed below the upper surface of the iron plate-like body 21a, and the side edge of the iron plate-like body 21a and the makeup are arranged. By forming the welding step 26b between the upper end of the plate 25, the welding operation can be performed easily and reliably. Moreover, the car body weight 20 having the structure shown in FIGS. 1 to 3 is completed by welding the side edges of the adjacent decorative plates 25 together.

  As described above, the iron plate bodies 21a, 21b, 21c, 21d, 21e, and 21f having different sizes are stacked from the bottom in the descending order of size, and the welding step 26a is provided between the iron plate bodies that are vertically adjacent to each other. Thereby, welding joining of each steel plate-shaped body can be performed downward, and welding of the 1st bracket 22 located below at the time of completion can also be performed downward. And by welding the 2nd bracket 23, the lifting member 24, and the decorative board 25 after reversing the weight main body 21 up and down, these welding operations can also be performed downward. Therefore, since the welding operation of each member can be performed in an easy posture, the welding joining of each member can be performed easily and reliably.

  Further, the decorative board is not provided on the bottom that is not noticeable when the car body weight 20 is used, and the upper end of the decorative board 25 is simply welded to the side edge of the iron plate-like body 21a having the largest size. No welding marks are generated on the entire plate surface of the plate 25, and the appearance can be improved. Further, since the cut surface of the iron plate-shaped body is not exposed to the outside, the cut surface may be rough, and therefore the iron plate-shaped body can be easily cut out in a short time. Moreover, since the lower end of the decorative board 25 is located above the lower surface of the weight main body 21, the decorative board 25 may be damaged when the car body weight 20 is placed on the loading platform or the ground during transportation. Also disappear.

  The car body weight 20 formed in this manner is mounted on the car body 17 by lifting the car body weight 20 using the lifting member 24, and the upper connecting arm 17c of the car body 17 and the second bracket of the car body weight 20 23, and the lower connecting arm 17d of the car body 17 and the first bracket 22 of the car body weight 20 are aligned, and the connecting pins 27 are respectively connected to the connecting through holes 27 formed at the tip portions thereof. 28 can be inserted into the connecting pin 28 and a retaining clip 28a is attached to the connecting pin 28. Moreover, the removal of the car body weight 20 from the car body 17 can be easily performed in the same manner.

  In addition, this invention is not restricted to the said example, The number of sheets and size of the iron plate-shaped bodies which comprise a weight main body are arbitrary, and the shape of an iron plate-shaped body is also arbitrary. Furthermore, the mounting position and the number of installations of the brackets to be attached to the weight body and the connecting arm provided to the car body can be appropriately set according to the weight and size of the car body weight and the mounting state to the car body.

  DESCRIPTION OF SYMBOLS 11 ... Crawler crane, 12 ... Lower traveling body, 13 ... Upper turning body, 13a ... Equipment room, 13b ... Driving room, 13c ... Base, 14a ... Main winding rope, 14b ... Supplementary winding rope, 14c ... Rising rope, DESCRIPTION OF SYMBOLS 15 ... Boom, 16 ... Counterweight, 17 ... Car body, 17a ... Slewing bearing, 17b ... Jack bracket, 17c ... Upper connection arm, 17d ... Lower connection arm, 18 ... Crawler, 18a ... Axle, 18b ... Crawler expansion / contraction cylinder 19 ... Jack, 19a ... Jack arm, 20 ... Car body weight, 21 ... Weight body, 21a, 21b, 21c, 21d, 21e, 21f ... Iron plate, 22 ... First bracket, 23 ... Second bracket, 24 ... Lifting member, 25 ... Decorative plate, 25a, 25b ... Notch, 26a, 26b ... Step for welding, 27 ... Connection Through-hole, 28 ... connecting pin, 28a ... retaining clip

Claims (2)

  In the manufacturing method of car body weights to be mounted on the car body of a crawler crane, a large iron plate is placed on the upper surface of the largest iron plate that has a plurality of different iron plates arranged at the lowest position. A plurality of other iron plate bodies are sequentially laminated in order of decreasing order from the state body, and a weight main body in which a plurality of iron plate bodies are integrated by welding the upper and lower adjacent iron plate bodies together. The weight body forming process to be formed, the first bracket welding process in which the first bracket for connecting the car body projecting to one side is welded to one side upper part of the weight body, and the weight body is turned upside down. A weight body reversing step in which the largest steel plate is placed at the top, and a carbo body projecting to one side on the upper side of the weight body that has been reversed and placed higher. The second bracket welding process for welding and joining the second bracket for connection, the lifting member welding process for welding and joining the lifting member for lifting the car body weight on the upper surface of the weight body that has been reversed and placed higher, and the size A method for manufacturing a car body weight, comprising sequentially performing a decorative plate welding step of welding a decorative plate covering a side surface of the weight body to a side edge of the largest iron plate-like body.   In the car body weight attached to the car body of a crawler crane, a plurality of iron plate bodies having different sizes are stacked in order of increasing size from the lower order, and the adjacent iron plate bodies are welded in the stacked state. A weight body, a first bracket for connecting a car body that is welded to one side lower part of the weight body and projecting to one side, and a car that is welded to one side upper part of the weight body and projecting to one side A second bracket for connecting the body, a lifting member for lifting the car body weight welded to the upper surface of the weight body, and a side surface of the weight body by welding to the side edge of the largest steel plate-like body A car body weight characterized by comprising a decorative veneer covering.

Images