JP2580328B2 - Conveyor with lifting platform - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a transport device provided with a worktable that can be raised and lowered and slidable in any direction in front, rear, left and right.

(Conventional technology and its problems) This type of transport device with a lifting work table is used as a transport device for supporting an engine or the like when an engine or the like is lifted from below and assembled to an automobile body suspended on a trolley conveyor. It is used.

That is, since the work table is supported on the lift table supported by hydraulically driven lifting drive means on the carriage so as to be slidable in any direction in front, rear, left and right, the work table is supported on the work table to a predetermined level. Although the position of the lifted work can be freely adjusted in the front, rear, left, and right directions, the work table is moved to the lower limit position so that the work can be safely loaded and transferred onto the work table. It is necessary to configure the worktable to be automatically centered when lowered.

A conventional centering device for the worktable in this type of transport apparatus with a worktable is disclosed, for example, in Japanese Patent Application Laid-Open No. Sho 62-122870.
As described in Japanese Patent Laid-Open Publication No. H10-209, the system comprises a hydraulic cylinder for centering in each of the front, rear, left and right directions provided on a lifting platform driven up and down by a lifting drive means, and the weight of the entire lifting platform including the working table is large. Therefore, not only is the load applied to the lifting drive means extremely large, but also it is necessary to provide a hydraulic pipe between the lifting platform and the truck, which has the drawback that the cost of the entire apparatus becomes extremely high.

(Means for Solving the Problems) An object of the present invention is to provide a transport device with a lifting and lowering worktable that can solve the conventional problems as described above. The lifting platform 4 supported on the trolley 1 by hydraulically driven lifting and lowering driving means 5, and a hydraulic supply unit 1 for supplying hydraulic pressure to the hydraulic cylinder unit 9 of the lifting and lowering driving means 5.
4. A worktable 7 supported on the elevating platform 4 so as to be able to move horizontally in any direction in front, rear, left and right, and centering the working table 7 in both front, rear, left and right directions when the elevating platform 4 is lowered to a lower limit position. The work table 7 is provided at one end side in the front-rear direction of the lift table 4 and has a centering pinch extending to the other end side. The centering device 28 includes a pair of left and right holding bodies 30a and 30b that are provided at the other end in the front-rear direction of the elevating platform 4 and that perform centering operations on the holding arm 32 for centering.
And a centering cam 31 that is provided on the carriage 1 and moves the pair of left and right holding members 30a and 30b closer to each other when the lifting platform 4 is lowered. Cam
It is configured to be distributed in the front-rear direction with 31.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a bogie, which is provided with a free wheel 2 which rolls on the floor at the bottom, and a worker boarding platform on both left and right sides and a front side as shown in FIG. 3 is provided. Reference numeral 4 denotes an elevator, which is supported by the carriage 1 via a hydraulically driven elevator drive means 5 so as to be able to ascend and descend.
A work table 7 is supported on the upper front end via a slide table 6.

The hydraulically driven lifting / lowering drive means 5 includes a pair of left and right pantograph links 8 interlocked with each other and a pair of hydraulic cylinder units 9 for driving the pantograph links.
Of the 10b, the front fulcrum 10a is pivotally supported at a fixed position on the trolley 1, and the rear fulcrum 10b is supported by a slide guide 11 provided on the trolley 1 via a wheel so as to be movable back and forth. The front fulcrum 12a of the pair of front and rear fulcrums 12a and 12b on the upper end side of the pantograph link 8 is pivotally supported at a fixed position on the lift 4 and the rear fulcrum 12b is a slide guide 13 provided on the lift 4. Is supported movably back and forth through wheels.

A hydraulic supply unit 14 for supplying hydraulic pressure to the hydraulic cylinder unit 9, that is, a tank 15, a hydraulic pump 1
A hydraulic supply unit 14 including a pump drive motor 17 and a pump drive motor 17 is installed in a unit supporting concave portion 18 provided in the carriage 1 directly below the elevating platform 4. Reference numeral 19 denotes a bellows-like cover which is stretched between the periphery of the base 1 and the periphery of the lift 4 as necessary.

As shown in FIGS. 3 to 5, the slide table 6
A sliding body 21 fitted on a longitudinal slide guide rail 20 laid on the lift 4 and a pair of front and rear contact plates 23a and 23 opposed to a longitudinal stopper 22 provided on the lift 4
b, and are slidably supported in the front-rear direction within a range until the contact plates 23a and 23b contact the front-rear stopper 22. The working table 7 includes a sliding body 25 fitted on a left-right slide guide rail 24 laid on the slide table 6 and a pair of left and right sides facing a left-right stopper 26 provided on the slide table 6. Contact plates 27a and 27b are provided, and are slidably supported in the left-right direction within a range until the contact plates 27a and 27b contact the left-right stopper 26.

Reference numeral 28 denotes a sentan ring device of the work table 7. The centering device 28 includes a pair of left and right holding bodies 30a and 30b supported by guide rails 29 laid on the elevating platform 4 behind the worktable 7 so as to be slidable in the horizontal direction. The extended centering clamp arm 32, a centering cam 31 provided on the carriage 1 for moving the two clamps 30 a and 30 b in a direction of approaching each other, and the centering clamp arm 32. At the tip, the two holding bodies
And a clamped portion 33 composed of a vertical shaft roller supported so as to be located between 30a and 30b.

The two holding bodies 30a, 30b are urged in a direction approaching each other by a tension coil spring 35 stretched between these two holding bodies 30a, 30b via brackets 34a, 34b, and the two holding bodies 30a, 30b are On the inner side in contact with the held portion 33,
When the two holding bodies 30a and 30b move closer to each other, the holding part 33 of the centering holding arm 32 is guided to the centering position in the front-rear direction, and the work surface centering cam surface 36a having a U-shape in plan view. , 36b are formed.

The centering cam 31 is disposed in the front-rear direction with the hydraulic supply unit 14 as shown in the figure, and has a pair of left and right cam surfaces 37a and 37b located in a V-shape. , 37b
Brackets 39a, 39b project downward from 0a, 30b through the opening 38 of the lifting platform 4, and cam followers 40a, 40b comprising horizontal shaft rollers are provided at the lower ends of both brackets 39a, 39b. . Reference numeral 41 denotes a stopper that regulates the distance between the two clamps 30a and 30b when they approach each other, and is attached to one bracket 39b, and abuts on the other bracket 39a when the clamps 30a and 30b approach each other.

The cart 1 has a trolley 43 supported by guide rails 42 installed below the floor as shown in FIGS.
The front trolley 43a is connected to the front trolley 43a via a connecting rod 45. Thus, the leading trolley 46 is provided with a driven dog 51 which is detachable with a pusher 50 of a drive chain 49 supported via a trolley 48 on a guide rail 47 provided below the guide rail 42, This driven dog 51
The bogie 1 travels on the floor along the guide rails 42 by the engagement of the pusher 50. Reference numeral 52 shown in FIG. 2 denotes a power supply means for supplying necessary electric power to the hydraulic supply unit 14 of the traveling vehicle 1 and the like.

The transport device configured as described above can be used as a means for transporting assembled parts such as an engine in a process of assembling the engine or the like from below, for example, to an automobile body transported by a trolley conveyor, The cart 1 travels on a fixed path at a constant speed while supporting assembled parts such as an engine on a worktable 7. Then, the pantograph link 8 is extended by the hydraulic cylinder unit 9 by the operation of the operator who is on the operator boarding table 3 to raise the elevator 4 to a predetermined height as shown in FIG. An operation of assembling an engine or the like supported by the worktable from below into an automobile body that is conveyed synchronously with the carriage 1 by a trolley conveyor is performed.

When the lift 4 is raised as described above, the cam followers 40a and 40b of the centering device 28 are separated upward from the centering cam 31 on the carriage 1, so that the pair of holding members 30a and 30b It can move freely on the guide rail 29 in the left-right direction. Therefore, the worktable 7 can be horizontally moved in any direction in the front, rear, left and right directions within a certain range. That is, since the working table 7 is supported movably in the left-right direction on the slide table 6 supported movably in the front-rear direction with respect to the elevating table 4, the abutment plate 23
a) to move horizontally in any direction in the front-rear direction and left-right direction within the range of movement in the front-rear direction where any one of a and 23b abuts, and in the range of movement in the left-right direction where one of the contact plates 27a and 27b abuts the left-right stopper 26. Can be.

This movement of the worktable 7 also causes the centering held arm 32 (the held part 33) to move integrally, but when the held part 33 (the worktable 7) moves in the left-right direction, a pair of holdings is performed. One of the bodies 30a and 30b is pressed and moved in the moving direction, and the other holding body is moved by the extension coil spring 35. When the clamped portion 33 (work table 7) moves in the front-rear direction, the clamps 30a and 30b are pushed and expanded against the extension coil spring 35 via the work table centering cam surfaces 36a and 36b. become. Of course,
The moving range of the worktable 7 in the front, rear, left and right directions is limited so that the held portion 33 does not deviate from between the holding members 30a and 30b (a hatched range 53 shown in FIG. 6).

As described above, the raised work table 7 can be moved in any direction in the front, rear, left, and right directions, so that the position of an assembly component (engine or the like) supported on the work table 7 can be freely set on a horizontal plane. The assembling work can be performed while adjusting. FIG. 6 shows a state in which the workbench 7 is horizontally moved to both front and right limit positions.

The pantograph link 8 is contracted by the hydraulic cylinder unit 9 to lower the lift 4 so that the second
The worktable 7 can also be lowered as shown in the figure, but when the lift 4 is lowered in this way, as shown in FIGS. 3 to 5, the worktable 7 is provided on the pair of holding bodies 30a and 30b. One of the cam followers 40a, 40b (the cam follower 40a in the example of FIG. 6) is a pair of cam surfaces 37a, 37b of the centering cam 31.
One side (the cam surface 37a in the example of FIG. 6) is downwardly contacted, and with the lowering of the elevator 4, the left and right direction (left in the example of FIG. 6) up to the center position between the two cam surfaces 37a and 37b. Centered on The other cam follower also moves in the same direction, but as the worktable 7 also moves in the front-rear direction as shown in FIG. 6, the sandwiched portion 33 pushes the space between the two holding bodies 30a and 30b left and right. When extended, both cam followers 40a,
40b is forcibly pushed and narrowed to the minimum interval by the two cam surfaces 37a and 37b, and the pair of holding bodies 30a and 30b move close to each other to the minimum interval.

When the lifting platform 4 reaches the lower limit position by the above-described centering action, the pair of holding bodies 30a and 30b are in the closest position to each other at the center position of the moving range in the left-right direction as shown in FIGS. The clamped portion 33 located between the clamps 30a, 30b is located at the center position of the left-right movement range of the clamps 30a, 30b, and the work table centering cam surface 36a of the clamps 30a, 30b. It is positioned at the center in the front-rear direction of 36b.

Since the worktable 7 moves integrally with the clamped portion 33, the worktable 7 is centered at the center position in both the front, rear, left and right directions as shown in the figure by positioning the clamped portion 33 as described above. become. In this state, the cam followers 40a and 40b are sandwiched between the lower ends of the two cam surfaces 37a and 37b of the centering cam 31 from both left and right directions, so that the pair of sandwiching bodies 30a and 30b hold the sandwiched portion 33. Since the work table 7 is fixed while being clamped at the centering position, the worktable 7 is locked at the centering position in both the front, rear, left, and right directions. In other words, by lowering the worktable 7 to the lower limit position via the elevating table 4 and the slide table 6, the worktable 7 is automatically centered in the front, rear, left, and right directions, and is locked at the centering position. ,
The loading of the assembled components onto the worktable 7 and the transportation after the loading can be performed safely.

In the above embodiment, the centering device 28 is provided on the rear side of the work table 7 as shown in FIG.
It is also possible to arrange a centering device 28 in front of the centering device. In this case, the operator boards 3 can be provided on both the left and right sides and the rear side of the carriage 1.

(Effects and Effects of the Invention) As described above, according to the transport device with a lifting worktable according to the present invention, when the worktable is lowered to the lower limit position, the worktable is automatically moved to the centering position with respect to the front, rear, left, and right directions. Although it is possible to position, the centering device of the worktable, a pair of left and right holding bodies that are arranged and distributed in the front-rear direction with the worktable and that perform centering operation of a centering held arm extending from the worktable, A power source, such as a hydraulic cylinder, serving as an actuator for centering the worktable, since the centering cam is provided on the carriage and moves the pair of left and right holding members toward each other when the lift table is lowered. Is not required, and such a power source is necessary, and compared with a configuration in which the power source is arranged on a lift platform. ,
The entire device can be configured at very low cost.

In addition, a hydraulic supply unit on the trolley for supplying hydraulic pressure to the hydraulic cylinder unit of the lifting / lowering drive means is disposed separately from the centering cam in the front-rear direction. Since a pair of holding bodies are also arranged in the front-back direction,
At least the working space on the left and right sides of the worktable is not narrowed by the hydraulic supply unit, the centering device, and the like, and a wide work space can be secured on both the left and right sides of the worktable to improve workability.

[Brief description of the drawings]

1 is a side view, FIG. 2 is a rear view, FIG. 3 is a partially longitudinal side view showing a detailed structure of a main part, FIG. 4 is a longitudinal rear view of the same part, and FIG. FIG. 6 is a partially cutaway plan view showing a state in which the work support base has been moved at the ascending limit position, and FIG. 7 is a schematic plan view of the whole. 1 ... trolley, 4 ... lifting platform, 5 ... lifting drive means, 6 ...
... Slide table, 7 ... Work table, 8 ... Pantograph link, 9 ... Hydraulic cylinder unit, 20,24,29 ... Guide rail, 21,25 ... Sliding body, 28 ... Centering device, 30a, 30b …… Nipping body, 31 …… Cam for centering, 3
2 ... Centered clamped arm, 33 ... clamped section (vertical axis roller), 35 ... Extension coil spring, 36
a, 36b ... Cam surface for work centering, 37a, 37b ... V
U-shaped cam surface, 40a, 40b: Cam follower (horizontal axis roller).

Claims (1)

(57) [Claims] A lifting platform supported by a hydraulically driven lifting drive unit on a trolley; a hydraulic supply unit for supplying hydraulic pressure to a hydraulic cylinder unit of the lifting drive unit; A work table supported so as to be movable, and a transport device with a lifting work table, comprising a centering device for centering the work table in both front, rear, left, and right directions when the lift table is lowered to a lower limit position; The platform is provided at one end in the front-rear direction of the elevator, and includes a pinched arm for centering extending to the other end, and the centering device is provided at the other end in the front-rear direction of the elevator. A pair of left and right holding bodies for centering the centered holding arm; and a pair of left and right holding bodies provided on the carriage and the left and right Of a centering cam of approaching moving together the holding member, the hydraulic supply unit, the centering cams and longitudinal direction sorting arrangement has been that the lifting work platform with the transport device.