JP3919448B2 - Self-propelled work machine assembly jig device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a jig apparatus used when assembling a frame body in a self-propelled work machine such as a backhoe or a log loader.
[0002]
[Prior art]
In the backhoe, the frame body includes a track frame that supports the traveling device, a front work device, an engine, and a swivel frame that mounts the boarding operation unit. These frame bodies partially include each component. After being welded and temporarily assembled, they are automatically welded and assembled by a welding robot. Further, if necessary, machining such as drilling is performed after the automatic welding.
[0003]
In this case, in the automatic welding process of the frame body, the temporarily assembled and welded work is positioned and fixed using a jig, and the jig for the work is replaced whenever the work specifications are different.
[0004]
[Problems to be solved by the invention]
However, since jigs were prepared for each workpiece with different specifications, it took time to replace and manage the jig every time the workpiece was changed, and a lot of space for storing the jig. Was necessary.
[0005]
The present invention has been made paying attention to such a situation, and can easily replace and manage a jig when assembling a frame body in a self-propelled working machine, and store the jig. The main object of the present invention is to provide an assembly jig apparatus that can easily perform management effective for space reduction.
[0006]
[Means for Solving the Problems]
[Configuration, operation and effect of inventions according to claims 1 and 2 ]
[0007]
(Structure) The invention according to claim 1 is equipped with a work table on which a temporarily assembled and assembled track frame is mounted as a work, and a pair of left and right clamp units are mounted so that the position can be changed in the left and right directions. In addition, a positioning pin to be inserted into the knock hole formed in the workpiece and a clamp fitting for fastening and fixing the workpiece on the work table are equipped so that the left and right clamp fittings are positioned between the left and right positioning pins. In order to clamp and fix the clamp fittings, the clamp fitting operating driving means is provided, and the left and right clamp units are adjusted to the left and right along the work surface to adjust the left and right positions of the pair of left and right positioning pins. The work table is provided with a clamp position changing drive means for changing the position in the direction, and the left and right clamp units are inserted into the knock holes of the workpiece. In the positioning state in which the positioning pin is inserted, the left and right clamp fittings are tightened and fixed by operating the clamp fitting operating drive means to clamp and fix the workpiece portions on the left and right outer positioning pins.
[0008]
According to the second aspect of the present invention, the positioning pin and clamp fitting of each clamp unit are mounted on a movable frame that can be moved left and right along the rail, and the clamp position changing drive means includes a screw shaft that screw-feeds the movable frame and the screw shaft. It is comprised with the electric motor driven reversely.
[0009]
(Effect) According to the structure of the said Claim 1 and Claim 2, what is necessary is just to move each right and left clamp unit to the predetermined position with respect to the workpiece | work by the clamp position change drive means for the process of the workpiece | work from which a specification differs. Thus, it is possible to properly position and fix a workpiece having a dimensional specification that falls within the movement range of the left and right clamp units on one work table.
[0010]
(Effects) Therefore, according to the inventions according to claim 1 and claim 2 , it is not necessary to change the jig every time the workpiece specifications are different, and the setup can be changed easily and quickly. The assembly work efficiency when manufacturing a small number of units can be improved.
[0011]
In addition, since a single jig device can handle workpieces with many specifications, jig management becomes easy and the storage space for jigs can be greatly reduced, contributing to the effective use of space in the facility. it can.
[0012]
[Configuration, operation and effect of invention of claim 3 ]
[0013]
(Structure) According to the invention of claim 3 , in the invention of claim 1, by inputting the work information, each clamp unit is automatically set at a preset position corresponding to the work to which the work information is input. Control means for moving is provided.
[0014]
(Operation / Effect) According to the above-described configuration, the clamp unit can be automatically moved to a position corresponding to the workpiece by inputting workpiece information by, for example, key operation or reading a barcode. Therefore, the jig can be changed in an extremely short time, the time for changing the setting can be saved, and the work efficiency can be further improved, and the above-mentioned effect of the invention of claim 1 is promoted.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a backhoe which is an example of a self-propelled work machine. This backhoe has a swivel frame 4 mounted on a swivel frame 4 on a track frame 3 having a pair of left and right crawler type traveling devices 1 and a dozer device 2, and a boom 5, arm 6, In addition, a front device 8 formed by sequentially connecting buckets 7 is provided, and a driving unit 9 and a boarding operation unit 10 that house an engine (not shown) are mounted.
[0016]
The track frame 3 and the revolving frame 4 are structures assembled by welding components made of cast steel or steel plate, and the present invention is an improvement of a jig apparatus used in the process of assembling them. One example will be described below.
[0017]
2 to 7 illustrate a jig device A1 used in the process of automatically welding the track frame 3. In the following description, the track frame 3 is referred to as a work W.
[0018]
This jig apparatus A1 is detachably mounted on a support base 11 installed and fixed on the floor surface of the front part of the welding robot B, and a work base 12 mounted and connected to the support base 11, and the work It is composed of a pair of left and right clamp units 13 that are arranged so as to protrude on the table 12.
[0019]
Each clamp unit 13 is configured by mounting a positioning pin 16, a clamp fitting 17, and a work support base 18 on a movable frame 15 that can move left and right along a rail 14 disposed on the lower surface of the work table 12. In addition, both clamp units 13 are exposed to be movable in the left-right direction through left and right openings 19 formed in the work table 12 . In addition, a screw shaft 20 for screw-feeding the movable frame 15 and an electric motor 21 for forward / reverse rotation driving are provided as drive means for moving the clamp units 13 to the left and right below the work table 12. A controller 22 for controlling this is provided.
[0020]
The positioning pins 16 in the clamp unit 13 are inserted into a pair of knock holes 23 formed in the workpiece W to position the workpiece W, and are moved out and out by the air cylinder 24. Further, the clamp fitting 17 is rocked up and down around the a fulcrum to press and fix the edge of the center opening of the workpiece W, and is rocked by the air cylinder 25. .
[0021]
Here, the controller 22 is connected to a control device 26 that is installed and fixed, and a controller 27 of the welding robot B is also connected to the control device 26, and an input unit 26a provided in the control device 26 is manually operated. When the information for specifying the workpiece W is input, the electric motor 21 is controlled based on the information set in advance, and clamped at a predetermined position set for appropriately positioning and fixing the target workpiece W. The unit 13 is automatically moved. Also, based on the input workpiece information, the welding robot B operates based on a preset program, and automatic welding corresponding to the workpiece W positioned and fixed is performed.
[0022]
Further, the jig device A1 can be removed from the support base 11 and replaced with a support base of another welding robot. At this time, the controller 22 of the other welding robot is connected to the controller 22 equipped on the work table 12. By connecting to the control device, the automatic position change control of the clamp unit 13 and the setting of the welding program are performed also in this welding robot by inputting work information to the control device as in the previous case.
[0023]
[Another embodiment]
The present invention can also be implemented in the following forms.
[0024]
(1) In the above-described embodiment, one of the pair of clamp units 13 may be installed in a fixed position as a reference clamp unit, and only the other clamp unit 13 may be moved.
[0025]
(2) In the above embodiment, the means for inputting the work information to the control device 26 may be appropriately selected from well-known input means such as key input, bar code input, and magnetic card input.
[Brief description of the drawings]
1 shows a plan view and FIG. 4 jig apparatus for the automatic welding equipment that the overall side view and FIG. 2 is a side view of the automatic welding equipment utilizing the jig device [3] the fixture using the backhoe Plan view [Fig. 5] Vertical side view of the jig device [Fig. 6] Vertical front view showing the state of the jig device before the work is mounted [Fig. 7] Vertical front view showing the workpiece fixing state of the jig device Explanation】
12 Working table 13 Clamp unit
14 rails
15 Movable frame 16 Positioning pin 17 Clamp fitting
20 Screw shaft
21 Motor
23 knock hole
25 Air cylinder
26 Control means W Workpiece

Claims (3)

A work table on which the temporarily assembled welded track frame is placed as a work is equipped with a pair of left and right clamp units that can be repositioned in the left and right directions, and each clamp unit is inserted into a knock hole formed in the work. Equipped with positioning pins and clamp fittings that fasten and fix the workpiece on the workbench so that the left and right clamp fittings are positioned between the left and right positioning pins, and to clamp and fix the workpiece Clamp position changing drive means which is equipped with a drive means for operating clamp fittings and which changes the left and right clamp units in the left and right direction along the work table surface in order to adjust the left and right positions of the pair of left and right positioning pins. Equipped with a work table, and positioning by inserting the positioning pins of the left and right clamp units into the knock holes of the workpiece. For assembly of a self-propelled working machine, wherein the right and left outer clamp pins are clamped and fixed by operating the clamp fitting operating drive means in the state to clamp the workpiece part on the left and right positioning pins. Jig device. The positioning pins and clamp fittings of each clamp unit are mounted on a movable frame that can be moved left and right along the rail, and the clamp position changing drive means is a screw shaft that screw-feeds the movable frame and an electric motor that drives forward and reverse rotation thereof. The assembly jig device for a self-propelled working machine according to claim 1, wherein the assembly jig device is constituted by a motor.   The self-propelled working machine according to claim 1, further comprising a control means for automatically moving the clamp unit to a preset position corresponding to the workpiece for which the workpiece information is input by inputting the workpiece information. Assembly jig device.

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