JP2010024007A - Pallet carrier device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pallet carrier device, capable of moving a pallet truck between stock lines without using a large driving motor. <P>SOLUTION: The device includes a rotary bracket 6 rotatably attached to a fixed frame 5; a conveyor part 4 provided in a position distant from a rotation axis O of the rotary bracket 6 and adapted so that a pallet truck 2 for work carrying can be loaded thereon; a balance weight 8 mounted on the opposite side to the conveyor part 7 across the rotating axis O of the rotary bracket 6; and an actuator 9 rotationally driving the rotary bracket 6. The distance between the rotating axis O of the rotary bracket 6 and the conveyor part 7 is such that when the rotary bracket 6 is rotationally driven at 180° by the actuator 9, the conveyor part 7 can move between a first position P1 where the conveyor part 7 is connected to a first stock line 4A of the pallet truck 2 and a second position P2 where the conveyor part 7 is connected to a second stock line 4B of the pallet truck 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pallet transfer device, and in particular, a transfer device including a stock line for transferring a plurality of pallet trucks carrying workpieces to be assembled to a construction object such as an automobile engine, and a stock line for transferring pallet trucks with workpieces lowered. It is related with the pallet conveyance apparatus connected to each stock line.

  FIG. 8 is a diagram showing an overall configuration of a conventional stock apparatus 90 described in Patent Document 1 (Japanese Patent Laid-Open No. 2008-150205). The conventional stock apparatus 90 transports, for example, the first stock line 92a that transports the pallet truck 91 in the transport direction X with the workpiece W placed thereon, and the pallet truck 91 that has lowered the work W in the direction opposite to the transport direction X. A second stock line 92b, and a lifting device 93 that includes a conveyor portion 93a that can be connected to the starting point and the ending point of both the stock lines 92a and 92b, and is configured to be able to move the pallet cart 91 up and down.

  Further, the pallet truck 91 described in Patent Document 1 has a self-propelled carriage structure with a motor attached thereto, and includes a power supply for supplying the trolley line to the trolley line and a sensor provided before and after the pallet carriage 91. When there is no obstacle in the traveling direction, current flows through the motor and the pallet travels, and when there is an obstacle ahead in the traveling direction, it stops.

  FIG. 9 is a diagram showing a configuration of the lifting device 93. The lifting device 93 uses a motor 94 as a drive unit, and a conveyor unit 95 that carries the pallet truck 91 into and out of the lifting device 93, and the conveyor unit 95. Is attached to the support column 96 so as to be vertically movable while being suspended by the chain 96a, and the power from the motor 94 is transmitted to the chains 94a and 96a and the sprockets 96b and 96c. The pallet carriage 91 is moved up and down.

JP 2008-150205 A

  The lifting device 93 configured as described above is large enough to lift the total mass of the pallet cart 91, the conveyor unit 95, and the bracket 97 in order to apply a force necessary to move the pallet cart 91 up and down to the bracket portion 97. A motor 94 that can generate a driving force (torque) is required. For this reason, since large power is applied to each part during operation of the lifting device 93, even if any abnormality is detected, the operation of the bracket part 97 cannot be stopped instantaneously, and the lifting device 93 may be damaged. There is a problem that there is.

  In addition, since a large force is always applied to the chains 94a and 96a, the service life is shortened and the maintenance cycle must be shortened. If the chains 94a and 96a are broken, the brackets are broken. Since the portion 97 may fall and cause damage to other portions, it is necessary to attach a mechanism for preventing the fall (such as a stopper) in case of an emergency.

  For this reason, it is preferable to provide a safety fence around the conventional stock device 90 and the lifting device 93 for the safety of the operator, and when adding or deleting the pallet truck 91 to the stock device 90, the stock device 90 had to be stopped.

  The present invention has been made in consideration of the above-described problems, and an object of the present invention is to provide a pallet transport device that can move a pallet truck between stock lines without using a large drive motor.

  In order to solve the above-mentioned problems, the present invention is capable of mounting a rotating bracket that is rotatably attached to a fixed frame and a pallet truck that is mounted at a position away from the rotating shaft of the rotating bracket and that is used for workpiece transfer. A conveyor unit, a balance weight attached to the opposite side of the conveyor unit around the rotation axis of the rotary bracket, and an actuator for driving the rotary bracket to rotate. When the rotary bracket is driven to rotate at a predetermined angle by the actuator, the distance to the part is a first position where the conveyor part is connected to the first stock line of the pallet truck, and the conveyor part is connected to the second stock line of the pallet truck. It is the distance that can be reciprocated between the second positions to be connected to Providing pallet conveying apparatus characterized and.

  The pallet conveying apparatus having the above-described configuration includes a first position and a conveyor unit in which the conveyor unit is connected to the first stock line by rotationally driving the rotary bracket in the forward and reverse directions by an actuator (motor, hydraulic cylinder, air cylinder, etc.). Can be reciprocated between second positions connected to the second stock line. When the range of the rotation angle of the rotation bracket is 180 °, the distance from the rotation axis of the rotation bracket to the attachment position of the conveyor is half of the movement distance by the pallet conveying device. That is, the distance from the rotating shaft of the rotating bracket to the mounting position of the conveyor is set in accordance with the moving distance of the pallet carriage and the range of the rotating angle of the rotating bracket.

  Since the balance weight is attached to the opposite side of the conveyor portion around the rotation axis of the rotation bracket, the actuator can rotate the rotation bracket with a small power when transporting the conveyor portion up and down. The mounting position of the conveyor part and the balance weight is opposite to the rotation axis of the rotating bracket, that is, the position of the opposite phase different by 180 °, and it is preferable that the balance part and the balance weight are mounted so as to be balanced as much as possible. . The first position and the second position depend on the arrangement of the first stock line and the second stock line, and in the case of saving space by arranging these stock lines side by side, the first position is the first position. The position and the second position are arranged one above the other, and the pallet transport device operates as a lifting device.

  Preferably, the rotating bracket has a disk shape, and the actuator includes a driving pulley having a high frictional resistance portion that abuts on the outer periphery of the rotating bracket, and a driving motor that rotationally drives the driving pulley. 2).

  In the pallet conveying apparatus having the above-described configuration, when the driving pulley rotates, a predetermined driving force is transmitted to the rotating bracket via the driving pulley, so that the conveyor unit can be conveyed. Further, an actuator using a motor as a drive source rotates the rotating bracket at a constant speed. When an external force that stops the movement of the conveyor portion is applied, the driving pulley slips, the driving force of the driving motor is not transmitted to the rotating bracket, and the rotation stops. The high frictional resistance portion preferably includes an O-ring made of rubber or synthetic resin, and the driving pulley preferably has a groove for fitting the O-ring on its outer periphery.

  In addition, a pulley or sprocket is provided on the outer periphery of the rotating bracket, and an endless belt, an endless rope (cable body) or a chain is wound around the pulley or sprocket and the sprocket connected to the driving pulley or driving motor. It is also conceivable that the rotary bracket is rotationally driven by a drive motor.

  In the case where the balance weight has a mass that is balanced with an object having half the mass of a pallet carriage mounted on the conveyor unit (Claim 3), the drive source is necessary for rotationally driving the pallet stand. It is sufficient to supply half of the power, and an actuator with low output can be used.

The conveyor unit has a conveyor mounting shaft rotatably connected to a rotating bracket; and
A horizontal holding pulley connected to the conveyor mounting shaft, a fixed pulley having the same diameter as the horizontal holding pulley and fixedly arranged concentrically with the rotary shaft of the rotating bracket, and the fixed pulley and the horizontal holding pulley. When connected to a horizontal holding mechanism comprising an endless belt body wound around a pulley for use (Claim 4), the horizontal connected to the fixed pulley by the endless belt body even if the rotating bracket rotates. The rotation direction of the holding pulley can be fixed in the same direction as the fixed pulley. In other words, the conveyor mounting shaft connected to the horizontal holding pulley and the conveyor section can be kept horizontal.

  The endless belt body is preferably one that does not expand and contract, and may be a person having a high frictional resistance portion, but more preferably a non-slip toothed belt. In addition, the endless belt body is preferably one that bends flexibly in order to keep the horizontal state of the conveyor portion stable. For this reason, the endless belt body is preferably a belt, but the endless belt body is wound between pulleys. The shape is not limited as long as it is rotated and transmits tension. That is, a chain or a cord-like body may be used as the endless belt body. Further, it is preferable to provide anti-slip teeth on the horizontal holding pulley and the fixed pulley.

  The first stock line and the second stock line include at least two power rails arranged along a traveling track of the pallet truck, while the pallet truck has at least two electrical connections to the power rail. , A drive motor that supplies power for traveling in a predetermined traveling direction determined by the polarity of the electric power supplied through the terminal, and the presence of adjacent obstacles that are respectively arranged before and after the pallet carriage And a control circuit that is connected to these sensors and supplies electric power to the drive motor so as to travel on the pallet when no obstacle is detected in the traveling direction, and the conveyor unit, When connected to the first stock line and the second stock line, each is connected to the power rail and electrically It is preferably provided connected by the switching power supply rail (Claim 5).

  More specifically, the sensor includes a switch that releases a contact in a state where the presence of an obstacle is detected, and the control circuit connects two power supply lines of the drive motor to the two terminals, respectively. In addition, it is conceivable to include a diode whose forward direction is the direction from the drive motor to the terminal, and the switch connected to each of these diodes in parallel.

  According to the above configuration, the sensors provided before and after the pallet truck detect that there are no pallet trucks or obstacles adjacent to the front and rear, and the control circuit does not detect obstacles such as pallet trucks adjacent in the traveling direction by the sensor. In this case, since electric power is supplied to the drive motor, the pallet trucks on the stock line can be run in a predetermined running direction and stocked in a state adjacent to each other. Since each pallet truck is self-propelled by a drive motor provided on each pallet truck, each drive motor supplies power sufficient to transport a workpiece mounted on one pallet truck.

  Further, the power supplied to the power supply rail is supplied to the control circuit via the terminal, and the power controlled via the control circuit is supplied to the drive motor. That is, all pallet trucks can be supplied with power from one power source without using a power source having a mass or life as a power source. Since the traveling direction is determined by the polarity of the power supplied to the power rail, the traveling direction can be switched without rotating the pallet.

  In addition, when the conveyor unit is connected to the first stock line and the second stock line, it is connected to the power supply rails and electrically connected to the respective power supply rails. It can be adjusted to the stock line to which the conveyor unit is connected, and the pallet truck can be carried in and out of the conveyor unit with a very simple configuration.

  Moreover, it is preferable to provide the switching power supply rail provided in the conveyor unit perpendicular to the rotation direction of the rotary bracket. Thereby, it can prevent that a pallet cart moves with respect to a conveyor part with rotation of a rotation bracket, and can obtain the stable operation | movement. By aligning the rotation direction of the rotating bracket with the direction of the switching power supply rail, the rotating bracket can be rotated using some of the inertia associated with the movement of the pallet truck when it is carried in, or the inertia of the rotating bracket can be rotated. You may make it carry out a pallet cart using some.

  The power supply rails and terminals require at least a pair of power supply rails and terminals of positive and negative electrodes. In addition to this, it is preferable to provide a ground power supply rail and terminals for preventing leakage. In addition, the power rail can also serve as a traveling rail, thereby simplifying the configuration, but a separate trolley power line may be routed.

  The conveyor section preferably includes a cam follower that engages with a cam receiver provided on the stock line side so as to be guided and fixed so as to be connected to predetermined positions of the first stock line and the second stock line. Item 6).

  According to the above configuration, the cam follower provided in the conveyor portion is engaged with the cam receiver, so that the connection state between the stock line and the conveyor portion can be reliably performed and locked, and the lock mechanism is provided. As a result, the conveyor can be stably fixed, so that the reliability is improved. The cam follower preferably includes a roller at the tip for reducing contact resistance with the cam receiver, and the cam receiver preferably includes a slope portion for guiding the cam follower.

  The position of the cam follower is such that when the cam follower is fixed to the cam receiver, the cam follower is once bent toward the rotating shaft side of the rotating bracket before reaching the rotating end of the rotating bracket, and then the bending is eliminated or weakened at the rotating end of the rotating bracket. If the cam follower is engaged with the cam receiver at the rotating end of the rotating bracket, the weight can be applied in the locking direction, and the locked state can be stabilized. Can keep.

  As described above, according to the present invention, since the pallet carriage can be moved with the minimum necessary power, an actuator with a small output can be used as the drive source. Therefore, even if the user accidentally touches the drive part during operation, it is safe because a large force is not applied to the user. Even if the actuator of the drive source is completely damaged, the rotating bracket does not rotate suddenly, and further safety can be ensured. In addition, the pallet truck can be transported with less force, which saves energy, and the apparatus can be made smaller, saving resources.

  The rotating bracket can be balanced with the fixed frame as long as it can be attached to the fixed frame in a rotatable manner. The pulley can be brought into contact with and easily rotated. Since the rotation by the drive motor is stable, there is no unevenness in the movement of the pallet truck and stable operation can be expected. In addition, since the driving force from the drive motor is transmitted to the rotating bracket via the driving pulley that is in frictional contact with the rotating bracket, even if the user accidentally touches the device, the driving pulley runs idle and the device It is safe because it can stop the movement.

  In the case where a lock mechanism using a cam receiver and a cam follower is provided at the joint between the stock line and the conveyor portion, the joint state between the stock line and the conveyor portion can be stabilized, so that the reliability can be further improved.

  1-7 is a figure which shows the structure of the pallet conveying apparatus 1 which concerns on 1st Embodiment of this invention, FIG. 1 is a figure which shows the whole structure. A pallet conveying apparatus 1 shown in FIG. 1 conveys a plurality of pallet carriages 2 mounted with shafts such as cams or cranks as workpieces W from the workpiece carry-in portion 1a to the workpiece carry-out portion 1b. That is, the pallet conveyance device 1 of the present embodiment is arranged in each of the workpiece carry-in unit 1a and the workpiece carry-out unit 1b and pallet lifting / lowering unit 3 that conveys the pallet carriage 2 in the vertical direction, the workpiece carry-in unit 1a, and the workpiece carry-out unit 1b And a pair of upper and lower stock lines 4 disposed between the two.

  Each of the pallet trucks 2 includes a drive motor 2a and sensors 2b that are respectively arranged before and after the pallet truck 2 to detect the presence of adjacent obstacles, and travel without colliding with the front and rear pallet trucks 2 themselves. It is. Therefore, a plurality of pallet carts 2 can be placed on standby on the stock line 4.

  The pallet elevating unit 3 is provided at a position away from the fixed frame 5 installed on the floor surface F, the rotary bracket 6 rotatably attached to the fixed frame 5, and the rotation axis O of the rotary bracket 6. A conveyor unit 7 that is attached and configured to be able to mount a pallet carriage 2 for workpiece transfer, a balance weight 8 that is mounted on the opposite side of the conveyor unit 7 around the rotation axis O of the rotating bracket 6, and the rotation The pallet conveying device 1 according to the present embodiment includes the pallet elevating units 3 at both ends of the stock line 4. In the following description, when each pallet elevating unit 3 is distinguished, it is referred to as a first pallet elevating unit 3A and a second pallet elevating unit 3B.

  The stock line 4 has a first stock line 4A for transporting the pallet cart 2 in the transport direction X from the right to the left (the workpiece carry-in portion 1a to the workpiece carry-out portion 1b) with the workpiece W mounted on the pallet cart 2, A second stock line 4B is provided that conveys the pallet carriage 2 arranged side by side below the first stock line 4A and having lowered the workpiece W in the conveyance direction Y from the workpiece carry-out portion 1b to the workpiece carry-in portion 1a. Each stock line 4 is provided with a pair of power supply rails 4c for supplying electric power to the pallet truck 2. The pallet carriage 2 can be moved in the transport direction X or the transport direction Y only by changing the polarity of the power supplied to the power supply rails 4c, 4c.

  Therefore, in the pallet transport device 1 according to the present embodiment, the first position P1 and the second position P2 are connected to the stock lines 4A and 4B in which the pallet elevating units 3 provided at both ends of the stock line 4 are arranged in the vertical direction. By transporting the pallet truck 2 up and down, the pallet truck 2 can be transported in a loop as a whole. In the present embodiment, the pallet conveying device 1 includes not only the pallet elevating unit 3 but also the stock line 4 to which the pallet elevating unit 3 is connected. However, the pallet conveying device 1 of the present invention includes at least one pallet. What is necessary is just to have the raising / lowering part 3. FIG.

  2-4 is a figure which shows the detailed structure of the pallet raising / lowering part 3 which is the principal part of the pallet conveying apparatus 1 of this invention, FIG. 2 is a side view, FIG. 3 is a top view, FIG. It is a figure explaining the detailed structure.

  As shown in FIG. 2, the fixed frame 5 includes a leg 5 a having a height adjusting mechanism and firmly fixed to the floor surface F, and a connection portion 5 b connected to the frame on the stock line 4 side, The rotating shaft O of the rotating bracket 6 is fixed in the vicinity of the upper end portion 5c.

  Further, as shown in FIG. 3, stays 5f and 5g for attaching abutting portions 5d and 5e made of synthetic resin for defining the operation end of the rotation operation of the rotary bracket 6 at appropriate positions of the fixed frame 5, and the rotation bracket Sensors 5h and 5i for detecting a state where 6 is at the operating end are provided. Reference numeral 5j denotes a support shaft for wiring signal lines for electrically connecting various sensors (described later) provided on the conveyor unit 7. The sensors 5h and 5i are preferably non-contact sensors such as photoelectric tubes and magnetic sensors.

  The rotary bracket 6 has a disk shape and is rotatably attached to the rotary shaft O by a bearing 6a made of a bearing or the like at the center thereof, as shown in FIG. A conveyor mounting shaft 7a is mounted at a position separated by d1 in parallel with the rotation axis O and is rotatable with respect to the rotation bracket 6. The balance weight 8 is positioned at a distance d2 on the opposite side of the rotation axis O by 180 °. Is attached.

  In this embodiment, both distances d1 and d2 are the same, and the mass of the balance weight 8 is a mass in a state where an object having half the mass of the pallet carriage 2 is mounted on the conveyor unit 7. That is, the balance weight 8 has a mass that is balanced in a state where an object having half the mass of the pallet carriage 2 is mounted on the conveyor unit 7. Accordingly, when the pallet truck 2 is mounted on the conveyor section 7, the conveyor section 7 is heavier by half the mass of the pallet truck 2, and when the pallet truck 2 is not mounted on the conveyor section 7, the balance weight 8 side is The pallet truck 2 is configured to be heavier by half the mass.

  As shown in FIG. 3, an abutting piece 6b that abuts one of the abutting portions 5d and 5e at the operating end of the rotating operation is provided at an appropriate position of the rotating bracket 6.

  The conveyor portion 7 is attached to the rotating bracket 6 by the conveyor mounting shaft 7a being rotatably connected to the rotating bracket 6 by a bearing 7b such as a bearing. The pulley 7c is connected. On the other hand, 7d is a fixed pulley arranged concentrically and concentrically with the rotation axis O of the rotary bracket 6. By winding an endless belt body 7e around the fixed pulley 7d and the horizontal holding pulley 7c, The fixed pulley 7d and the horizontal holding pulley 7c can always be kept in the same direction (horizontal) by the tension transmitted by the endless belt body 7e. In other words, each of the members 7 a to 7 e is a horizontal holding mechanism that can hold the level of the conveyor unit 7. The endless belt body 7e is configured so as not to slip by providing teeth on the inside, and a roller (not shown) is brought into contact with the endless belt body 7e so as to keep applying an appropriate tension. .

  The conveyor unit 7 is connected to the power rail 4c provided in each stock line 4 when connected to the first stock line 4A and the second stock line 4B, and is also electrically connected to each other. A switching power supply rail 7f, a sensor 7g for detecting the pallet carriage 2 in a state where the pallet carriage 2 is mounted in the conveyor unit 7, and guiding and fixing the conveyor unit 7 so as to be connected to a predetermined position of the stock line 4. Provided with a cam follower 7h. The cam follower 7h engages with a cam receiver 4d provided on the stock line 4 side, whereby the conveyor portion 7 can be stably connected to the stock line 4.

  In addition, the contact surface of the power supply rail 4c and the switching power supply rail 7f is a cut surface S that is cut in such a manner that it becomes an inclined surface and comes into contact with the connection between the conveyor unit 7 and the stock line 4, and the conveyor unit 7 The switching power supply rail 7f is configured to be able to be electrically and reliably connected to the power supply rail 4c in the connected state with the stock line 4.

  The actuator 9 includes a driving pulley 9a having a high frictional resistance portion that comes into contact with the outer periphery of the disc-shaped rotating bracket 6, and a driving motor 9b that rotationally drives the driving pulley 9a. Further, as shown in FIG. 2, the high frictional resistance portion of the driving pulley 9a preferably includes an O-ring 9c made of rubber or synthetic resin, and the driving pulley 9a has a groove for fitting the O-ring 9c to the outer periphery thereof. It is preferable to have 9d. The driving motor 9b supplies the minimum necessary driving force that can rotate the rotary bracket 6.

  4A and 4B are views for explaining the relationship between the cam receiver 4d and the cam follower 7h. FIG. 4A is a side view as viewed from a direction perpendicular to the rotation axis O of the rotary bracket 6, and FIG. It is the side view seen from the axial center direction of the rotation axis O.

  As shown in FIG. 4, the cam receiver 4d has a slope portion 10 for guiding the cam follower 7h, and a positioning contact portion 11 at the moving end of the rotary bracket. A concave portion 12 is formed that is stably engaged with the cam follower 7h that abuts. As a result, the cam follower 7h is positioned at the rotational axis O side of the rotary bracket 6 once as shown by the phantom line before reaching the rotation end of the rotary bracket 6 when the cam follower 7h is fixed to the cam receiver 4d. It is arrange | positioned in the position where a deflection | deviation disappears in a rotation end, after bending to a point.

  5 to 7 are views for explaining the configuration of the stock line 4. FIG. 5 is a side view seen from a direction perpendicular to the transport direction X, FIG. 6 is a plan view, and FIG. FIG. 6 is a side view as viewed from a conveyance direction X.

  That is, the stock line 4 has a frame 4f having a leg 4e that is provided with a height adjusting mechanism and is stably fixed to the floor surface F, and at least both ends in the transport direction X are respectively shown in FIG. As shown, sensors 4g and 4h for detecting the pallet carriage 2 are attached. Although not shown, in the pallet transport device 1 of the present embodiment, the pair of power supply rails 4c provided on the first stock line 4A and the pair of power supply rails 4c provided on the second stock line 4B have polarities. A power supply unit that supplies different power is provided.

  Further, as shown in FIG. 7, the pallet carriage 2 includes a wheel 2c made of a conductor mounted on the power rail 4c, and a terminal 2d electrically connected to the power rail 4c by contacting the wheel 2c. A control circuit (not shown) that is connected to the terminal 2d and the sensor 2b and supplies power to the drive motor 2a when there is no obstacle ahead of the transport direction X (or transport direction Y), And a workpiece support 2e that stably receives the workpiece W.

  According to the pallet conveying apparatus 1 having the above-described configuration, when the pallet carriage 2 is mounted on the pallet carriage 2 in the work loading section 1a, the pallet carriage 2 travels on the stock line 4A using the power supplied from the power supply rail 4c. Will be stocked. At this time, it is not necessary to attach a separate battery to the pallet carriage 2, and power can be supplied from the power supply of the entire pallet transport device 1 via the power supply rail 4c. In other words, since the drive motors mounted on each pallet truck 2 need only secure the power necessary to transport each pallet truck 2, it is small, so that the user's body hits the pallet truck 2 that is running. Even so, it won't be so powerful as to injure you.

  Further, since the switching power supply rail 7f is also electrically connected to the power supply rail 4c, the pallet carriage 2 can be carried into and out of the conveyor section 7 simply by supplying power to the switching power supply rail 7f. it can.

  Next, when the workpiece W is removed in the workpiece unloading portion 1b, the actuator 9 rotates the rotary bracket 6 of the pallet lifting / lowering portion 3B by 180 ° to connect the conveyor portion 7 to the first stock line 4A from the first position P1. 2 can be moved to the second position P2 connected to the stock line 4B.

  At this time, the cam follower 7h provided in the conveyor portion 7 engages with the cam receiver 4d provided in the second stock line 4B, and particularly fits into the recess 12 provided in the cam receiver 4d. The connection state of the stock line 4B can be stabilized. Further, since the switching power supply rail 7f is connected to the power supply rail 4 of the second stock line 4B, the conveyance direction of the pallet carriage 2 is reversed (conveyance direction Y), and the pallet carriage 2 can be easily carried out from the pallet elevating part 3B. Can be done. When the unloading of the pallet carriage 2 is completed, the actuator 9 can rotate the rotating bracket 6 in the reverse direction to make an adjustment for loading the next pallet carriage 2.

  On the other hand, the pallet carriage 2 conveyed to the second stock line 4B moves to the conveyor unit 7 waiting at the second position P2 at the downstream end of the second stock line 4B in an empty state where no workpiece W is mounted (work loading). Then, the rotary bracket 6 is rotated 180 ° by the actuator 9 of the pallet lifting / lowering unit 3A, and the second position P2 for connecting the conveyor unit 7 to the second stock line 4B is changed to the first position P1 for connecting to the first stock line 4A. The actuator 9 returns the rotary bracket 6 to its original position so that it is moved and returned to its original position.

  Since the power required for the rotation of the rotating bracket 6 is very weak, even if the user accidentally touches the rotating bracket 6 that is moving, the high frictional resistance portion of the driving pulley 9 is The movement of the rotating bracket 6 can be easily stopped by slipping and slipping. In other words, safety can be ensured accordingly.

It is a figure which shows the whole structure of the pallet conveying apparatus which concerns on 1st Embodiment. It is a side view which shows the structure of the pallet raising / lowering part of the said pallet conveying apparatus. It is a top view of the pallet raising / lowering part of the said pallet conveying apparatus. It is a figure explaining the structure of the detail of the said pallet conveying apparatus. It is a figure explaining the structure of the stock line of the said pallet conveying apparatus. It is a top view of the stock line of the said pallet conveying apparatus. It is the longitudinal cross-sectional view which looked at the structure of the stock line of the said pallet conveying apparatus from the advancing direction. It is a figure which shows the structure of the conventional pallet conveying apparatus. It is a figure which shows the structure of the pallet raising / lowering part of the said pallet conveying apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pallet conveyance apparatus 2 Pallet cart 2a Drive motor 2b Sensor 2d Terminal 4 Stock line 4A 1st stock line 4B 2nd stock line 4c Power rail 5 Fixed frame 6 Rotating bracket 7 Conveyor part 7a Conveyor mounting shaft 7c Horizontal holding pulley 7d Fixed Pulley 7e Endless belt 7f Switching power supply rail 7h Cam follower 8 Balance weight 9 Actuator 9a Driving pulley 9b Drive motor d1 Distance from rotating shaft to conveyor O Rotating shaft

Claims (7)

A rotating bracket that is rotatably attached to the fixed frame;
A conveyor unit that is mounted at a position away from the rotation axis of the rotating bracket and is configured to be able to mount a pallet carriage for workpiece conveyance;
A balance weight attached to the opposite side of the conveyor portion around the rotation axis of the rotation bracket;
An actuator that rotationally drives the rotating bracket;
The distance from the rotating shaft of the rotating bracket to the conveyor unit is such that when the rotating bracket is rotated by a predetermined angle by the actuator, the conveyor unit is connected to the first stock line of the pallet carriage and the conveyor unit. Is a distance that can be reciprocated between the second positions of the pallet truck connected to the second stock line.   The said rotation bracket is a disk shape, The said actuator is provided with the drive pulley which has a high frictional resistance part contact | abutted on the outer periphery of a rotation bracket, and the drive motor which rotationally drives this drive pulley. Pallet transport device.   3. The pallet transport device according to claim 1, wherein the balance weight has a mass balanced in a state in which an object having a half mass of a pallet carriage is mounted on the conveyor unit. 4. The conveyor unit has a conveyor mounting shaft rotatably connected to a rotating bracket; and
A horizontal holding pulley connected to the conveyor mounting shaft, a fixed pulley having the same diameter as the horizontal holding pulley and fixedly arranged concentrically with the rotary shaft of the rotating bracket, and the fixed pulley and the horizontal holding pulley. The pallet conveying apparatus according to any one of claims 1 to 3, wherein the pallet conveying apparatus is connected to a horizontal holding mechanism including an endless belt body wound around a pulley for use. The first stock line and the second stock line include at least two power rails arranged along a traveling track of the pallet truck, while the pallet truck has at least two electrical connections to the power rail. , A drive motor that supplies power for traveling in a predetermined traveling direction determined by the polarity of the electric power supplied through the terminal, and the presence of adjacent obstacles that are respectively arranged before and after the pallet carriage And a control circuit that is connected to these sensors and supplies electric power to the drive motor so as to travel on the pallet when no obstacle is detected in the traveling direction, and
The said conveyor part is provided with the switching power supply rail connected to a power supply rail, respectively electrically when it connects with a 1st stock line and a 2nd stock line, respectively. The pallet conveying device according to claim.   The said conveyor part is provided with the cam follower engaged with the cam receiver provided in the stock line side so that it might guide and fix so that it might connect with the predetermined position of the said 1st stock line and the 2nd stock line. Item 6. The pallet carrying device according to Item 5.   The position of the cam follower is such that when the cam follower is fixed to the cam receiver, the cam follower is once bent toward the rotating shaft side of the rotating bracket before reaching the rotating end of the rotating bracket, and then the bending is eliminated or weakened at the rotating end of the rotating bracket. The pallet conveying device according to claim 6, which is arranged at a proper position.

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