JP7340855B2 - Workpiece moving trolley - Google Patents

Description

The present invention relates to a workpiece moving cart for transferring a heavy workpiece to a table lifter, workbench, or other receiving platform.

Heavy workpieces are often transferred to a receiving stand using a device such as a hawk lift, which has a hawk that can be moved up and down using a hydraulic mechanism using a hydraulic cylinder or an electric mechanism driven by a motor. There may be cases where it is not possible to use it, or it may be convenient to transport it manually. For example, Patent Document 1 describes a manual hand-carried vehicle that can transport stacked boxes to a predetermined location and unload them without using a hydraulic mechanism or an electric mechanism. This transport vehicle has an elevating frame above the vehicle frame and an elliptical cam at the front and rear ends of the vehicle frame.The elliptical cam is rotated to raise the elevating frame, lift the box, and transport it to a predetermined location. The structure is such that the box is lowered by lowering the lift frame, but the structure is complicated. That is, a support plate is fixed to the vehicle frame, a hand lever is pivoted to the support plate, a support rod is fixed to the central axis of the elliptical cam at the front and rear ends, and the support rod is fixed to the support plate. The oval cam is held between the vehicle frame and the elevating frame. This hand lever has one end of a front link and a rear link connected to each other so that they move together when the hand lever is rotated. Connect to eccentric shaft. With this configuration, when the hand lever is operated, the elliptical cam rotates via the link, and when it rotates in the long diameter direction, the lifting frame on which the box is placed rises, allowing the transport vehicle to move. When the box is rotated in the minor axis direction, the elevator frame is lowered and the box can be lowered. As described above, the conventional structure requires many parts such as a support frame, a support rod, and links, and has a complicated structure. Further, when lowering the elevator frame, a separate operating member such as a hand lever must be provided and operated, which is cumbersome to handle.

Utility Model Publication No. 3-23897 (Claims for Utility Model Registration, Figures 1, 7 to 9)

The problem to be solved by the present invention is to provide a workpiece moving cart that is manually operated, has an extremely simple structure, and is easy to handle.

According to the present invention, the main body of the cart is movable back and forth in the direction of the receiving platform, and the carriage is provided on the upper part of the carriage body so as to be movable up and down and back and forth. One member is provided with a linear member extending in the traveling direction, and the other member is provided with a vertical drive wheel that rotates while being guided by the linear member and supports the carrier, and when the main body of the carrier is in the backward position, the carrier is transported from the upper surface of the receiving platform. The center of rotation of the vertical driving wheels is displaced from the center of the outer shape of the vertical driving wheels so that the top surface of the platform is raised and the top surface of the conveyance platform is lowered from the top surface of the receiving platform when the truck body is in the forward position. A characteristic workpiece moving cart is provided, and the above-mentioned problems are solved. In the present invention, the linear member and the vertical driving wheel are, for example, a linear member composed of a rack, a chain, a pin rack, a rail, etc., and the vertical driving wheel is a gear that meshes with the rack, a chain sprocket that meshes with the chain, and a pin wheel that meshes with the pin rack. , a friction wheel that rolls in frictional contact with the rail, or any other appropriate mechanism that can rotate the upper and lower driving wheels when the carrier is moved.

In the present invention, preferably, the workpiece moving trolley is provided, wherein the linear member is a rack fixed to a conveyance table, and the vertical drive wheels are vertical gears provided on the trolley body. Further, the above-mentioned trolley body is composed of a plurality of holding frames extending at intervals in the direction of the receiving platform, the conveying platform is held by the holding frames, the holding frames have wheels, and the wheels provide a space between the holding frames. A base plate is formed with a plurality of rails so as to run on the rails. The above-mentioned receiving stand is composed of a plurality of upright frames provided at intervals into which the above-mentioned holding frame enters, and the above-mentioned base plate is provided with the above-mentioned base plate. The carriage body is provided with a stopper and a carriage backward stopper that the carriage body comes into contact with at the backward end when the carriage moves backward away from the receiving platform. The workpiece moving truck is provided with a carriage retraction stopper against which the platform comes into contact.

Further, according to the present invention, when the conveyance platform abuts the conveyance platform backward stopper, the center of rotation of the vertical driving wheel is displaced so that the vertical driving wheel rotates in a direction that moves the conveyance platform toward the conveyance platform backward stopper. The above-mentioned workpiece moving cart is proposed.

The present invention is configured as described above, and for example, a workpiece in which a plurality of plate-like bodies are stacked is moved by a cart and carried onto a receiving stand configured with a table lift, etc. It can be suitably used in a processing device that can raise the plate-like objects one by one by the thickness of . The cart of the present invention has a main body that can move back and forth in the direction of the receiving platform, and a conveying platform is provided on the top of the main body that can move vertically and back and forth. It can be transported in the direction of Then, a linear member extending in the traveling direction is provided on one of the main body of the trolley and the transport platform, and a vertical drive wheel is provided on the other member to rotate while being guided by the linear member to support the transport platform, so that the main body of the trolley is The center of rotation of the vertical driving wheel is set so that the top surface of the conveyance table is raised above the top surface of the receiving table when it is in the backward position, and the top surface of the conveying table is lowered from the top surface of the receiving table when the cart body is in the forward position. Since it is disposed at a position displaced from the center of the outer shape of the carriage, the carriage main body with a workpiece placed on the transfer platform in the retreated position can be moved forward toward the receiving platform without any hindrance. At this time, the top surface of the carrier is at a higher position than the top surface of the receiver until the carrier body hits the carrier advance stopper, so the carrier can be moved without the carrier colliding with the receiver. When the carriage body hits the carriage advance stopper, the forward motion is blocked, but the carriage can move forward due to inertia and pressing force until it hits the carriage advance stopper, and the vertical drive wheels rotate with the forward movement. In accordance with the amount of displacement of the rotation center, the distance between the pitch point, which is the point of contact between the linear member and the vertical driving wheel, and the rotation center becomes shorter, and the top surface of the conveyance table descends from the top surface of the receiving table. As a result, the workpiece on the conveyor table is received and supported by the receiving table during the descent.

After the work is transferred to the receiving table, the cart is moved back away from the receiving table. In the initial state, the top surface of the conveying table is lower than the top surface of the receiving table, so the conveying table is moved back without any problem. can be done. When the trolley retreats to the retreat position and stops, the upper and lower driving wheels rotate due to the conveyor table that moves due to inertia and pressing force, and the distance from the center of rotation to the pitch point becomes longer, and the top surface of the conveyor table is closer to the receiving table. It rises from the top surface and can place the next workpiece. As described above, the vertical movement of the conveyor platform can be automatically performed by rotating the vertical drive wheels using the inertia and pressing force associated with the movement of the cart, so compared to conventional systems, the number of parts is smaller and the configuration is easier. It is simple, and a special operation member for moving the conveyance table up and down can be omitted.

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, seen from the front. The front view of a conveyance table. An explanatory diagram of the main body of the truck seen from the front. An explanatory diagram of a vertical gear. The cart is shown, (A) is an explanatory diagram seen from the top, and (B) is an explanatory diagram seen from the side. The main body of the trolley is shown without the handle attached, (A) is an explanatory view seen from the top, and (B) is an explanatory view seen from the front. 1 shows a transport platform, (A) is an explanatory diagram seen from the top, (B) is an explanatory diagram seen from the side, and (C) is an explanatory diagram seen from the front. The base plate is shown, (A) is an explanatory view seen from a plane, and (B) is an explanatory view seen from a side. An example of assembling the trolley body and the conveyance platform by aligning the rack and the vertical gear is shown, (A) is an explanatory view of the state placed on the assembly workbench, and (B) is a partially enlarged view. An explanatory diagram when the trolley body approaches the forward end. FIG. 7 is an explanatory diagram when the conveyance table comes into contact with the conveyance table advance stopper. FIG. 7A is a partial explanatory diagram showing a state when the conveyance table is in contact with a conveyance table retraction stopper, and FIG. An example using a pressing aid is shown, (A) is an explanatory diagram before pressing, and (B) is an explanatory diagram when pressing. An explanatory diagram showing a combination of a chain and a chain sprocket. A combination of a pin rack and a pin wheel is shown, (A) is an explanatory diagram seen from the front, and (B) is an explanatory diagram seen from the side with a part cut away.

FIG. 1 shows an embodiment of the present invention, in which a workpiece moving cart 1 is provided adjacent to a receiving table 3 so as to transfer a workpiece 2, for example, a stack of plate-like bodies, to the receiving table 3. In the embodiment, the receiving table 3 is constructed and incorporated into the processing apparatus (not shown), like a lift table, so that the plate-shaped objects placed on its upper surface are lifted one by one and sent into the processing apparatus.

The workpiece moving cart 1 includes a cart main body 4 that can move back and forth in the direction of the receiving table 3, and a conveying table 5 that is provided on the upper part of the cart main body 4 so as to be movable up and down and back and forth. A linear member extending in the running direction is provided on the lower surface of one of the trolley body 4 and the carriage 5, in the embodiment shown in the figure, the carriage 5; A vertical driving wheel is provided which rotates while being guided by the linear member and supports the conveyance platform 5. In addition, contrary to the embodiment shown in the drawings, it is also possible to provide a linear member on the side of the truck body 4 and provide vertical driving wheels on the side of the transport platform 5 (not shown). As mentioned above, various configurations can be adopted for the linear member and the vertical driving wheels.As will be described in detail below, in the embodiment shown in FIGS. The driving wheel is composed of a vertical gear 7.

Referring to FIGS. 2, 3, and 5 to 7, the truck body 4 has a plurality of rows of holding frames 8 extending in parallel pairs at intervals in the direction of the receiving table 3. The holding frames 8 are provided facing each other with an insertion gap into which the plate-shaped carrier 5 can be inserted, and in the embodiment shown in the figure, six rows are provided. They are connected by a frame connecting plate 9, and as shown in FIG. 1, a trolley handle 10 is fixed in an upright position on the connecting plate 9. On the inner surface of the front end of the holding frame 8, there is provided a carriage advance stopper 11 that comes into contact when the carriage 5 moves forward, and on the inner surface of the rear end, there is provided a carriage retreat stopper 12 that comes into contact when the carriage 5 moves backward. It is being The holding frame 8 also has a gear mounting hole 14 for pivotally supporting the rotating shaft 13 of the vertical movement gear 7, and a wheel mounting hole 17 for mounting the wheel axle 16 of the wheel 15 for running the bogie 1. It is provided.

As described above, the conveyance table 5 is formed into a plate-shaped body with a width that can be inserted into the insertion gap of the holding frame 8 in a fitted state, and is connected to the conveyance table connection plate 18 provided at one end by tightening bolts. A carrier handle 19 is provided on the upper surface of the carrier connecting plate 18. The upper surface 5A of the conveyance table 5 is formed into a flat surface on which the work 2 can be placed, and the rack 6 is formed on the lower surface of the conveyance table 5. The racks 6 may be provided continuously along the entire lengthwise direction of the lower surface of the conveyor table 5, but in the embodiment shown in the figure, three vertically moving gears 7 are provided per holding frame 8 in consideration of the load of the workpiece. Since the number of vertical movement gears 7 is increased, the number of vertical movement gears 7 is divided into three locations. In addition, the teeth of each rack 6 are preferably marked with rack tooth numbers in order from "1" corresponding to the teeth of the vertical gear 7 that mesh with each tooth, and the vertical gears are also marked with rack tooth numbers as shown in FIG. If you mark the gear tooth numbers like this, it will be easier to align the rack and the vertical gear. Note that an appropriate mark may be used instead of the number.

As shown in FIG. 8, a base plate 21 is formed with a plurality of rails 20 on which the wheels 15 of the truck 1 run. The rail 20 extends to the receiving table 3 along between the holding frames 8. The receiving table 3 is composed of a plurality of upright frames 22 provided at intervals into which the holding frame 8 can fit, and the upper surface of the upright frames 22 has a table lifter structure. As shown in FIG. 1, a truck advance stopper 23 is provided at one end of the base plate 21 so as to come into contact with the truck 1 when the truck 1 travels forward to the forward end toward the receiving platform 3, and at the other end. is provided with a truck backward movement stopper 24 so as to come into contact with it at the rearward movement end when the carriage retreats in a direction away from the receiving table 3.

The vertical movement gear 7 raises the top surface 5A of the carrier 5 above the top surface 3A of the receiver 3 when the carrier is in the backward position, and raises the upper surface 5A of the carrier 5 above the upper surface 3A of the receiver 3 when the carrier is in the forward position. The center of rotation A is displaced from the center B of the outer shape of the vertical movement gear 7 so as to descend from the upper surface 3A. In the embodiment shown in the figure, when receiving the workpiece 2, the height of the top surface 5A of the conveyance table 5 is 5 mm higher than the top surface 3A of the receiving table 3, and when the cart moves in the direction of the receiving table 3 and descends. Although the amount of displacement is determined to be 6 mm lower than the upper surface 3A of the receiving table 3, this amount of displacement can be set appropriately as desired.

FIG. 4 shows an example of a vertically moving gear 7 whose rotation center is displaced. In FIG. 4, when the center of the external shape of the vertical gear 7 is B, and the rotation center of the vertical gear 7 is A, the tooth located outward on the line A-B is designated as "3", and the tooth on the right side is designated as "3". are sequentially designated as "2" and "1". As a result, the distance from the rotation center to the pitch point, which is the contact point between the rack and the vertical movement gear, is made so that the right teeth "2" and "1" are sequentially larger than the tooth "3". Further, the left tooth of "3" is sequentially changed to "4", "5", etc., so that the distance from the center of rotation to the pitch point becomes shorter in sequence.

In the embodiment shown in the figure, a total of 18 vertical movement gears 7 are provided in order to support the load of the workpiece, so in order to vertically move the conveyance table 5 in a horizontal state, all 18 vertical movement gears 7 must be used. The meshing positions of the teeth of the gear 7 and the teeth of the rack 6 must match. Various assembly methods can be used for positioning, one example of which is shown in FIG. To explain in detail, first, the conveyor table 5 assembled as shown in FIG. 7 is placed on the assembly workbench 25 with the rack 6 facing upward. Next, one of the holding frames 8 that make up the carriage body 4 in pairs is removed from the holding frame connecting plate 9, and the front end of the rack 6 of the carriage 5 is brought into contact with the carriage forward stopper 11. The trolley body 4 is placed on the assembly workbench 25 in a state where they are in contact with each other, and the holding frame 8 is brought adjacent to the rack 6 of the transport platform 5. Then, depending on the height of the conveyor platform 6 when the cart is moving forward, the vertical gear 7 is positioned so that, for example, the teeth "10" of the vertical gear 7 mesh with the teeth "10" of the rack 6. Insert it into rack 6. Thereafter, the other holding frame 8 that had been removed is placed on the assembly workbench 25 with its front end aligned with the conveyance table advance stopper 11, and the vertical movement gear 7 is placed between the opposing holding frames 8. , and insert the rotating shaft 13 into the gear attachment hole 14 to assemble the vertical gear 7 between the holding frames 8 , and fix the removed end of the holding frame 8 to the holding frame connecting plate 9 . After all 18 vertical movement gears 7 are assembled between the holding frames 8 in this way, with the conveyor table 5 and the truck body 4 combined, turn the conveyor table 5 so that it is located above the truck body 4. If the assembly is then taken out from the assembly workbench, the meshing positions of all the vertical gears 7 and the racks 6 can be properly adjusted and assembled. Since the wheels 15 do not need to be aligned, they can be assembled by inserting them between the holding frames at the appropriate time and inserting the wheel axles 16 into the wheel mounting holes 17.

The truck 1 assembled as described above is set so that the wheels 15 roll on the rails 20 of the base plate 21 as shown in FIG. At this time, when the rear end of the carriage 1 is in contact with the carriage backward stopper 24, the rear end of the carriage 5 is also in contact with the carriage retreat stopper 12. The teeth of the rack 6 of the conveyance table 5 are engaged with the teeth of a vertical movement gear 7 that is displaced so that the upper surface 5A of the conveyance table 5 is at a higher position than the upper surface 3A of the receiving table 3. Then, a workpiece 2 made of, for example, a plurality of stacked plate-like bodies is placed on the conveyance table 5, and the cart handle 10 is pushed to move the cart forward in the direction of the receiving table 3.

When the truck 1 is moved forward, the holding frame 8 of the truck body 4 enters between the upright frames 22 of the receiving table 3, and until the truck 1 comes into contact with the truck advance stopper 23, as shown in FIG. 5 is still in the raised position. While the truck 1 is moving forward, the carrier 5 is placed on the truck body 4 and is moving forward together with the truck body 4, but the carrier 5 itself is not moving forward yet. Therefore, since the upper surface 5A of the conveyance table 5 is held at a higher position than the upper surface 3A of the receiving table 3 by the vertical movement gear 7, there is no risk of hitting the receiving table 3, and the cart 1 runs without any trouble.

When the carriage 1 comes into contact with the carriage advance stopper 23 and stops, an inertial force acts in the forward direction on the carriage 5 on which the load of the workpiece 2 is applied, and as shown in FIG. The conveyance table 5 moves forward until it hits the forward stopper 11. When this inertial force is small, by pressing the carrier handle 19 in the forward direction, the carrier 5 can be advanced to the position where it hits the carrier advance stopper 11 in the same manner as described above. During this forward movement, the vertical movement gear 7 that meshes with the rack 6 of the conveyance platform 5 is rotated, and the teeth that have a short distance from the center of rotation to the pitch point mesh with the rack 6. Therefore, the top surface 5A of the rack 6, that is, the transport platform 5 descends to a position lower than the top surface 3A of the receiving table 3. During the descent, the workpiece 2 on the conveyor table 5 is transferred from the conveyor table 5 to the receiving table 3.

After the workpiece has been transferred, the cart 1 is moved back to a position where it hits the cart retraction stopper 24 using the cart handle 10. At this time, the conveyance table 5 retreats until it hits the conveyance table retraction stopper 12 due to the inertia force, the pressing force applied to the conveyance table handle 19, and the like. Then, the vertical movement gear 7 that meshes with the rack 6 of the conveyance table 5 rotates, and the teeth with a large distance from the center of rotation to the pitch point correspond to the teeth of the rack 6, so that the upper surface 5A of the conveyance table 5 , is held higher than the upper surface 3A of the receiving stand 3.

As mentioned above, the upper surface 5A of the conveyor table 5 is raised in the retracted position, but in order to secure the raised position, when the conveyor table 5 abuts the conveyor table retraction stopper 12, the conveyor table 5 must be conveyed. The center of rotation of the vertically moving gear 7 may be displaced so that the vertically moving gear 7 rotates in the direction in which the table retraction stopper 12 moves. For example, when the tooth "3" of the vertical gear 7 is meshed with the tooth "3" of the rack 6, the load from above is applied to the rotation center A of the vertical gear 7 and the center B of the outer shape of the vertical gear 7. Since it is on the connecting line, no rotational force acts on the vertical gear. However, if the teeth "2" and "1" of the vertical movement gear 7 mesh with the teeth "2" and "1" of the rack 6, the positions of the centers A and B will shift. As a result, as shown in FIG. 12(B), the center A becomes the fulcrum A, and the center B becomes the point of application B on which the load acts. When this happens, a rotational force acts on the vertical gear 7 in the counterclockwise direction in FIG. 12 due to the lever principle, and a force is applied to the vertical gear 7 in the direction of rotating the rack 6 in the backward direction. The conveyor table 5 can maintain the raised position. Note that the carriage body 4 may be provided with an appropriate hook or other latching device to hang the conveyance platform 5 in the retreated position (not shown).

If a latch is provided as described above, it can be removed when the trolley 1 is moved forward in the direction of the receiving platform 3, but when a strong rotational force is acting on the vertical movement gear 7 in the direction of moving the trolley 1 backward. , it is sufficient to provide an appropriate pressing means for actively pressing the trolley 1 in the forward direction. FIG. 13 shows one such embodiment. As shown in FIG. 13(A), when the side push type toggle clamp 26 is fixed to the trolley main body 4 and the handle 27 is rotated, the pressing rod 28 moves as shown in FIG. As shown in B), it protrudes and hits the rear end surface of the carrier 5 to press the carrier in the forward direction. Note that the trolley handle may be provided in the shape of a lever, and a mechanism may be provided (not shown) that moves the transport platform in the forward direction in conjunction with the push of the trolley handle.

In the above embodiment, the rack 6 is used as the linear member and the vertical gear 7 is used as the vertical drive wheel, but FIG. 14 shows an embodiment using a chain mechanism. In FIG. 14, a chain 29 is fixed in a stretched state on the lower surface of the conveyance table 5, and a chain sprocket 30 that engages with the chain 29 is provided on the truck body 4. is rotatably supported. The rotation center A of this chain sprocket 30 is provided to be displaced from the center B of the outer diameter of the chain sprocket 30 so as to move the conveyance platform 5 up and down, similarly to the vertical movement gear 7 of the above embodiment. Therefore, when the cart 1 is moved in the direction of the receiving table 3, the conveying table 5 is in the raised position and moves forward without any hindrance, and when it reaches the receiving table 3, it descends and transfers the workpiece to the receiving table. can.

In the embodiment shown in FIG. 15, a pin rack 31 is provided on the lower surface of the carrier 5, and a pin wheel 32 that meshes with the pin rack 31 is provided on the truck body 4. The pin wheel 32 is rotatably supported by the truck body 4 via the rotating shaft 13. When the conveyance platform 5 travels, the pin 33 of the pin wheel 32 is engaged with the pin rack 31, so the pin wheel 32 rotates. The rotation center A of this pin wheel 32 is provided to be displaced from the center B of the outer diameter of the pin wheel 32 so as to move the conveyance table up and down, similarly to the vertical movement gear of the above embodiment. Therefore, when the cart 1 is moved in the direction of the receiving table 3, the conveying table 5 is in the raised position and moves forward without hindrance, and when it reaches the receiving table, it can descend and transfer the workpiece to the receiving table. . Although not shown in the drawings, when using a friction wheel as a vertical drive wheel, when the conveyance table moves, the friction wheel should be placed on the rail surface on which it rolls so that the friction wheel can reliably rotate and move the conveyance table up and down. It is sufficient to create sufficient friction between the two.

In the above embodiment, the truck body is provided with six rows of pairs of holding frames, but the truck body is formed in an appropriate shape and structure so that it can be stacked vertically without hitting the receiving stand when the truck is moved forward. can do.

1 Workpiece moving cart 2 Workpiece 3 Receiving platform 4 Cart body 5 Transport table 6 Rack 7 Vertical movement gear 8 Holding frame 11 Carriage table forward stopper 12 Carriage table backward stopper 15 Wheels 20 Rails 21 Base plate 22 Standing frame 23 Cart forward stopper 24 Cart Backward stopper 29 Chain 30 Chain sprocket 31 Pin rack 32 Pin wheel

Claims (5)

A trolley body that can move back and forth in the direction of the receiving platform,
A transport platform is provided on the top of the trolley body and is movable up and down and back and forth.
A linear member extending in the running direction is provided on one of the trolley body and the transport platform, and a vertical drive wheel is provided on the other member to rotate while being guided by the linear member to support the transport platform,
When the trolley body is in the retracted position, the upper surface of the carrier is raised above the upper surface of the receiving tray,
The center of rotation of the vertical driving wheel is provided so as to be displaced from the center of the outer shape of the vertical driving wheel so that the top surface of the conveyance table is lowered from the top surface of the receiving table when the trolley body is in the forward position ;
The trolley body is composed of a plurality of holding frames extending in pairs at intervals in the direction of the receiver,
The conveyor table is held by the holding frame,
the holding frame has wheels;
A base plate is formed with a plurality of rails so that the wheels run on rails provided between the holding frames,
The receiving stand is composed of a plurality of upright frames provided at intervals into which the holding frame can fit,
The base plate includes a truck advance stopper that the truck comes into contact with when the truck approaches the receiving platform and travels to the forward end;
A trolley retraction stopper is provided, which the trolley contacts at the rearward end when retreating away from the receiving platform.
The carriage body is provided with a carriage advance stopper that comes into contact with the carriage when it moves forward, and a carriage retreat stopper that the carriage comes into contact with when it moves backward.
Work moving trolley. The workpiece according to claim 1, wherein the center of rotation of the vertical driving wheel is displaced so that when the conveying table abuts the conveying table reversing stopper, the vertical driving wheel rotates in a direction that moves the conveying table toward the conveying table reversing stopper. Mobile trolley. 3. The workpiece moving trolley according to claim 1, wherein the linear member is fixed to a conveyance table, and the vertical driving wheels are provided on the trolley body . 3. The workpiece moving cart according to claim 1 , wherein the linear member is a rack, and the vertical drive wheel is a vertical gear that meshes with the rack . 5. The workpiece moving truck according to claim 1 , wherein the truck main body is provided with a pressing means for pressing the conveyor table in the forward direction .

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