JP2003072940A - Work conveying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work conveying device capable of efficiently carrying in and out a large work to and from a processing machine. SOLUTION: The work conveying device is so structured that a work conveying carriage 23 can be driven in a halfway section of a main conveying path C for mounting and conveying a work. The work conveying carriage 23 is provided with a plurality of work supporting parts 30 with an interval in a conveying direction of the main conveying path C, and an intermediate conveyer 27 as a part of the main conveying path C is placed in a position-fixed state between the work supporting parts 30. Each of the work supporting parts 30 comprises a rolling conveying body 34 for mounting and moving the work in a direction of the main conveying path C, and a work receiving frame 33 for elevating with the work mounted. The work receiving frame 33 is structured so as to be driven and elevated across a non operating position where the work receiving frame is immersed beneath a conveying level of the rolling conveying body 34 and an operating position where the work receiving frame projects above the conveying level of the rolling conveying body 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work transfer device used for loading and unloading a large work such as a machine frame of a construction machine into a processing machine such as an automatic welding machine.

[0002]

2. Description of the Related Art In the manufacture of a backhoe, which is an example of a construction machine, a track frame or revolving frame that has been temporarily assembled is carried into an automatic welding machine and subjected to finish welding processing. Large and heavy workpieces were carried in and out of the processing machine using overhead cranes and hoists.

[0003]

In the structure in which the work is conveyed by the above means, it takes a lot of time to carry the work into the processing machine and set the support base, which is one of the factors that hinder the improvement of the work efficiency. It was

The present invention has been made in view of the above points, and a main object thereof is to provide a work transfer device capable of efficiently carrying in and out a large work into and from a processing machine. To do.

[0005]

[Means for Solving the Problems] [Structure, Action and Effect of the Invention According to Claim 1]

(Structure) In the invention according to claim 1, a movement path of the work transfer carriage is installed across the middle part of the main transfer path for mounting and transferring the work and the processing area where the processing machine is installed. In addition, the work transport carriage is configured to be able to enter the middle part of the main transport path, and the work transport carriage is provided with a plurality of work support portions at intervals in the transport direction of the road main transport path, and In between, an intermediate conveyor, which is a part of the main transport path, is installed in a fixed position, and the work is placed on each work support part and the rolling transport body that moves in the transport direction of the main transport path, and the work It is characterized in that it is provided with a work receiving frame that is placed and raised and lowered, and that the work receiving frame can be raised and lowered above and below the transport level of the rolling transport body.

(Operation) According to the above construction, the work placed and conveyed along the main conveyance path is first transferred onto the work conveyance carriage which is waiting in the middle of the main conveyance path. It Next, the plurality of work support parts of the work transfer carriage are lifted to lift and support the transferred work on the main transfer path, and the work transfer carriage is retracted from the main transfer path to transfer the work to the processing area. To do.

In this case, when the work is transferred to the work carrier, the work receiving frame of the work supporting part is retracted from the rolling carrier so that the work can be easily introduced onto the work supporting part. Then, when moving the work transfer carriage toward the processing area, the work receiving frame is moved above the rolling carrier so that the work is placed on the work receiving frame and the work is displaced. It can be transported without.

Further, since the intermediate conveyor remains at a midway portion of the main transfer path where the work transfer carriage has moved toward the processing area and constitutes a part of the main transfer path, the subsequent work is Can be passed through an intermediate part of the main transfer path without the work transfer carriage and transferred to a processing area on the lower side of the transfer. Further, it is also possible to place the work, which has been processed in the processing area, on the work transfer carriage again, return it to an intermediate part of the main transfer path, and carry it out by this main transfer path.

(Effect) Therefore, according to the first aspect of the invention, a large and heavy work can be easily placed and transported by using the main transport path and the transport carriage, and the transport carriage can be placed in the processing area. Even while moving toward the main conveyance path, the function can be maintained and the work can be placed rearward while maintaining its function, and the large work can be transferred to the processing area or the processed work can be carried out smoothly and satisfactorily. It has become possible.

[Structure, Action and Effect of Invention According to Claim 2]

(Structure) In the invention according to claim 2, in the invention according to claim 1, the work transfer carriage is provided with an actuator for driving and raising and lowering the work receiving frame.

(Operation / Effect) According to the above configuration, the work receiving frame on which a heavy work is placed can be surely and quickly driven and raised, and the weight can be supported by the work receiving frame. It is possible to branch and convey a work piece from a part to a processing area in an efficient manner.

[Structure, Action and Effect of the Invention According to Claim 3]

(Structure) In the invention according to claim 3, in the invention according to claim 1 or 2, the interval of the work receiving frames is set wider than that of the work support base of the processing machine installed in the processing area. .

(Operation) According to the above configuration, the height of the work support base in the processing machine is set to be slightly higher than the transfer level of the rolling transfer body in the work support portion of the work transfer carriage, and the work receiving frame is supported by the work support frame. By setting it so that the work is placed and transported by raising it higher than the table, the work placed on the work receiving frame is conveyed once above the work support table and then the work receiving frame is moved. The work can be transferred to the work support of the processing machine by lowering it from the support. In addition, the carried-out work may be carried out by performing the above operations in the reverse order.

(Effect) Therefore, according to the invention of claim 3, the transfer from the work carrier to the work support of the processing machine can be carried out promptly, and the whole work loading or unloading work to the processing machine can be carried out. Can be done efficiently.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment in which the present invention is applied to a work transfer in a welding process of a turning frame in a backhoe will be described with reference to the drawings.

An example of the backhoe is shown in FIG.
In this backhoe, a swivel base 4 is mounted on the upper part of a truck frame 3 having a crawler type traveling device 1 on the left and right and a dozer device 2 so as to be fully swivelable about a vertical axis P1. An excavator 8 in which a boom 5, an arm 6 and a bucket 7 are sequentially connected to the front end of the
Is connected so as to be capable of swinging right and left (swing) around a vertical axis P2, and a driving part 9 and an operating part 10 accommodating an engine are mounted on a swivel base 4.

FIG. 2 shows a swivel frame 3A which is a base body which constitutes the swivel base 3, and the swivel frame 3A can swing the excavating device 8 to the left and right at the front end of a base plate 11 made of a steel plate. The cast steel swing bracket 12 connected to the base plate 11 is welded and fixed, and a vertical frame member 13 made of a steel plate as a backbone is formed along the upper surface of the base plate 11 from the left and right rear ends of the swing bracket 12 to the rear portion of the base plate 11. Are fixed by welding, and other components such as the frame member 14 are also fixed by welding.

Parts such as the vertical frame member 13 and the frame member 14 are to be temporarily welded to the base plate 11 manually and then subjected to final welding in an automatic welding process.
The work transfer device of the present invention is used in a transfer process of loading and unloading the swivel frame 3A that has been temporarily assembled and welded to and from a plurality of automatic welding machines.

FIG. 3 shows a partial plan view of a processing line for automatically welding the revolving frame 3A. In the figure,
A is a workpiece (swivel frame that is temporarily welded) W
Is a processing area for welding the workpiece W, and the workpiece W is mounted and supported to rotate around a horizontal axis and a vertical axis to change its posture and to move up and down, and an articulated welding robot. An automatic welding machine 18 composed of 17 is installed as a processing machine.

A main conveyor 20 is installed along a direction in which a plurality of the processing areas A are installed in parallel to form a main transfer path C for loading and unloading the work. This main conveyor 20 is configured by installing three idle roller type conveyor units 22 in parallel on the upper part of a conveyor frame 21 installed on the floor surface, and the placed work W is indicated by an arrow in FIG. Transport in direction F. In addition, a branch conveyance path C for traveling the work conveyance carriage 23 to convey the work W between the intermediate portion of the main conveyor 20 and the processing areas A1 and A2.
1, C2 are formed. For the sake of convenience, in the following description, the direction of the main conveyance path C is referred to as the left-right direction, and the directions of the branch conveyance paths C1 and C2 are referred to as the front-rear direction.

As shown in FIGS. 4 to 6 and FIG.
The work transfer carriage 23 has a structure in which the lower portions of two sets of left and right underframes 24a, 24b arranged at a predetermined interval in the left-right direction are connected by a stay 24c to be integrated, and front and rear of each underframe 24a, 24b. Wheels 25 provided on the left and right sides are mounted so as to be able to travel along four rails 26 laid on the floor orthogonally to the main transport path C, and the work transport carriage 23 as a whole is in the middle of the main transport path C. It is possible to enter the site. Then, the intermediate conveyor 27 is installed and fixed between the two underframes 24a and 24b at a place where the work transport vehicle is loaded in the main transport path C, and a part of the main transport path C is configured. In addition, as shown in FIG. 10, the intermediate conveyor 27 includes an idler roller type conveyor unit 29 above the conveyor frame 28 installed on the floor.
4 are installed in parallel. The stay 25c that connects the two sets of left and right underframes 24a and 24b is arranged in front of the underframes 24a and 24b so as not to interfere with the conveyor frame 28 of the intermediate conveyor 27.

Left and right underframes 2 of the work transfer carriage 23
A support frame 31 is erected on each of 4a and 24b, and a work support portion 30 is formed on the support frame 31. In the work supporting portion 30, four sets of rolling transfer units 32 are arranged in parallel in the front-rear direction, and a work receiving frame 33 is arranged so as to surround the rolling transfer units 32.

In the rolling transport unit 32, a disc-shaped rolling transport body 34 which is freely rotatable around the front-rear axis is provided with a main transport path C.
Are arranged at the upper end of the support frame 31, and the conveyance level L thereof is set at the same height as the conveyance level of the main conveyance path C.

The support frame 31 has a vertical rail 35.
A movable frame 37 which can be moved up and down along with and is driven up and down by an air cylinder (actuator) 36 is mounted, and the work receiving frame 33 is attached to the upper end of the movable frame 37, and the intermediate conveyor 27 side. It extends horizontally in a cantilever fashion. Then, as shown in FIGS. 5 and 6, when the movable frame 37 descends, the upper surface S of the work receiving frame 33 sinks below the transport level L of the rolling transport unit 32, and as shown in FIGS. The ascending / descending range of the work receiving frame 33 is set so that when the movable frame 37 moves up, the upper surface S of the work receiving frame 33 projects higher than the transport level L of the rolling transport unit 32.

The work transfer structure according to the present invention is constructed as described above, and in the work transfer carriage 23 which is on standby in the middle part of the main transfer path C, the work receiving frame 33 of the rolling transfer unit 32 is provided. The work W, which is immersed below the transfer level L and has been placed and transferred along the main transfer path C as shown in FIG. 12, is transferred via the rolling transfer unit 32 and the intermediate conveyor 27 to the work transfer carriage. It is carried on top of 23.

Here, as shown in FIGS. 9 and 10, the upper end of the support frame 31 of the underframe 24b located on the upstream side of the main transport path C of the work transport carriage 23 and the upper end of the conveyor frame 28 of the intermediate conveyor 27. 1, a pair of front and rear guide rails 42, 43 for engaging and guiding a pair of front and rear guide pins 41 that are inserted into the work W from above and projectingly provided on the lower surface are fixedly provided.
As shown in FIG. 1, the work W carried in on the work transfer carriage 23 has the guide pins 41 and the intermediate conveyor 2
The guide rails 43 on the upper part 7 determine the position in the direction (front-rear direction) orthogonal to the main conveyance path C. In addition, the guide rail 4 on the intermediate conveyor 27
A stopper 44 is fixed to the guide pin 3 and each guide pin 4
0 comes into contact with the stopper 44, positioning is performed in the direction of the main conveyance path C, and conveyance is stopped.

When the work W is carried into a predetermined position on the work transfer carriage 23, as shown in FIG. 13, the movable frame 37 is driven up to raise the work receiving frame 33 above the transfer level of the main transfer path C. By doing so, the work W is placed on the left and right work receiving frames 33 and lifted.

Next, as shown in FIG. 14, the work transfer carriage 23 is moved forward toward the processing area A1. Here, the left and right work support portions 3 of the work transfer carriage 23
The interval of 0 is set to be wider than the lateral width of the work support base 16 installed in the processing area A1, and the work support base 16 stands by at a position lower than the work receiving frame 33. Therefore, the work transfer carriage 2 is moved to the position where the left and right work support portions 30 sandwich the work support base 16 from the left and right.
It is possible to move the work 3 and carry the work W up to above the work support 16.

Next, as shown in FIG. 15, the work W can be transferred onto the work support 16 by raising the work support 16 and lowering the work receiving frame 33, as shown in FIG. As described above, the work transport carriage 23 that has finished loading the work returns to the original position.

Then, the work W on the work support 16 is provided.
After being positioned and fixed by a jig that is installed in advance, is subjected to automatic welding processing by the welding robot 17, as shown in FIG. In this case, the guide pin 41 inserted into and mounted on the work support 16 is manually removed by hand.

Further, even if the succeeding work W is transferred to the main transfer path while the work transfer carriage 23 for the processing area A1 is performing the work loading operation, it is intermediate in the transfer path portion where the work transfer carriage 23 is not present. Since the conveyor 27 remains, the succeeding work W can pass through the transfer path portion where the work transfer carriage 23 is not present, and the processing area A
It is possible to move the work transfer carriage 23 for 2 to the transfer path portion in which the work transfer carriage 23 is on standby.

The work W that has been subjected to the automatic welding process is transferred to the work transfer carriage 23 that has moved to the processing area A1 again, and then returned to the main transfer path C and unloaded.

[Other Embodiments] (1) The main conveyance path C may be constituted by a drive type conveyor. (2) It is possible to appropriately select a mode of manually moving the work transfer carriage 23 or a form of self-propelled movement. (3) As the actuator for driving the movable frame 37 up and down, a screw expansion mechanism driven by an electric motor, a hydraulic cylinder, or a lifter driven by other power can be used. (4) The processing machine is not limited to the automatic welding machine, but can be applied to an automatic machining line.

[Brief description of drawings]

1] Overall side view of backhoe

FIG. 2 is a perspective view of a revolving frame.

FIG. 3 is a plan view of a work transfer line.

FIG. 4 is a plan view of the work transfer device.

FIG. 5 is a front view of the main part of the work transfer device viewed from the processing machine side.

FIG. 6 is a side view of a main part of the work transfer device.

FIG. 7 is a front view of the main part of the work transfer device viewed from the processing machine side.

FIG. 8 is a side view of a main part of the work transfer device.

FIG. 9 is a perspective view of a work transfer carriage.

FIG. 10 is a perspective view of a fixed installation portion of the work transfer device.

FIG. 11 is a side view showing a positioning guide structure for a conveyed work.

FIG. 12 is a side view showing a state where the work is conveyed on the main conveyance path.

FIG. 13 is a side view showing a work lift state at a transfer path branching portion.

FIG. 14 is a plan view showing a state where the work is loaded into the processing machine.

FIG. 15 is a side view showing a state where the work is loaded into the processing machine.

FIG. 16 is a side view showing a state where the work is loaded into the processing machine.

FIG. 17 is a front view showing a state of machining a workpiece.

[Explanation of symbols] 16 Work support table 18 processing machine 23 Work transfer cart 27 Intermediate conveyor 30 Work support 33 Work receiving frame 34 Rolling carrier A processing area C Main transport path

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tatsuya Kusunita             1-1-1 Nakanomiya Oike, Hirakata City, Osaka Prefecture             Inside the Kubota Hirakata Factory (72) Inventor Kou Kou             1-1-1 Nakanomiya Oike, Hirakata City, Osaka Prefecture             Inside the Kubota Hirakata Factory (72) Inventor Kenji Ikeda             1-1-1 Nakanomiya Oike, Hirakata City, Osaka Prefecture             Inside the Kubota Hirakata Factory (72) Inventor, Yutani Mitani             1-1-1 Nakanomiya Oike, Hirakata City, Osaka Prefecture             Inside the Kubota Hirakata Factory (72) Inventor Shuji Shimotaka             1-1-1 Nakanomiya Oike, Hirakata City, Osaka Prefecture             Inside the Kubota Hirakata Factory (72) Inventor Fumihiro Okada             1-1-1 Nakanomiya Oike, Hirakata City, Osaka Prefecture             Inside the Kubota Hirakata Factory (72) Inventor Hiroshi Nakamura             1-1-1 Nakanomiya Oike, Hirakata City, Osaka Prefecture             Inside the Kubota Hirakata Factory F-term (reference) 3F044 AA01 CE02 CE08 CE09 CE16                       CE30 CE40 CE46

Claims (3)

[Claims] 1. A movement path of a work transfer carriage is installed between an intermediate part of a main transfer path for placing and transferring a work and a processing area where a processing machine is installed, and the work transfer carriage is mainly transferred. The work carriage is equipped with a plurality of work support portions at intervals in the transport direction of the main transport path, and the work transport carriage is provided between the work support trucks. The intermediate conveyer, which is a fixed part, is installed in a fixed position, and each work supporting part places a work and moves it in the carrying direction of the main carrying path, and a work receiving frame that puts the work and moves up and down. The work transfer device is characterized in that the work receiving frame can be moved up and down above and below the transfer level of the rolling transfer body. 2. The work transfer device according to claim 1, wherein the work transfer carriage is provided with an actuator for driving and lifting the work receiving frame. 3. The work transfer device according to claim 1, wherein the distance between the work receiving frames is set wider than that of the work support table of the processing machine installed in the processing area.