Stopper dog and conveying system

Abstract

To provide a stopper dog and a conveying system capable of reducing rattling of a carriage during conveyance by eliminating a gap between a towing attachment and the stopper dog and sufficiently preventing runaway of the carriage when a conveying conveyor decelerates or stops, or when the carriage is conveyed on an inclined section.SOLUTION: A stopper dog 110 arranged on the opposite side so as to be contactable with and detachable from a towing attachment C by opposing each other with respect to a pusher dog 150 provided on a conveying conveyor 101 or a carriage and abutting against the towing attachment C has: an abutting surface 112 which abuts on the towing attachment C; and a swing shaft 111. The abutting surface 112 has a conveying abutting portion 113 formed so that a distance from the swing center of the swing shaft 111 becomes smaller toward the maximum swing position side and a runaway prevention portion 114 provided on the maximum swing position side of the conveying abutting portion 113 and formed such that a distance from the swing center of the swing shaft 111 becomes longer toward the maximum swing position side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a stopper dog that is arranged on the opposite side of the carriage in the conveying direction to a pusher dog that is provided on a conveying conveyor or carriage and contacts the traction attachment of the carriage or conveying conveyor, and is capable of contacting and disengaging from the traction attachment, and to a conveying system having the stopper dog. [Background technology]

[0002] A known transport system is for transporting work carts or the like horizontally, in which a towing attachment provided on a transport conveyor arranged under the cart or the cart's transport path engages with and disengages from a pusher dog and a stopper dog provided on the transport conveyor or cart arranged on the cart's transport path to tow and free the cart. For example, as shown in FIG. 4, a conveying system 500 has a conveying conveyor 501, a plurality of pusher dogs 550 that are provided on the conveying conveyor 501 and contact a towing attachment C provided on the lower part of the cart, and a plurality of stopper dogs 510 that are arranged to face the pusher dogs 550 from the opposite side of the conveying direction of the cart and be able to contact and separate from the towing attachment C.

[0003] The pusher dog 550 is configured so that a pressing surface 552 at the tip can swing up and down around a swing shaft 551, and the pressing surface 552 abuts against the towing attachment C, so that the carriage is transported by the driving of the transport conveyor 501. The stopper dog 510 has a similar shape to the pusher dog 550, and is configured so that an escape prevention part 514 at the tip can swing up and down around a swing axis 511, and prevents the traction attachment C from coming off the pressing surface 552 and causing the cart to escape when the transport conveyor 501 decelerates or stops or when transporting on an inclined section. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Publication number 07-005314 Summary of the Invention [Problem to be solved by the invention]

[0005] Since the stopper dog 510 needs to swing upward with the pressing surface 552 of the pusher dog 550 in contact with the towing attachment C so that the runaway prevention part 514 faces the towing attachment C, the swing trajectory of the tip end (shown by the dotted line in FIG. 4) is designed not to interfere with the towing attachment C. A gap is formed between the towing attachment C and the stopper dog 510 during transportation, and due to the influence of fluctuations in the transport resistance of the trolleys of the transport conveyor, the towing attachment C is transported with a rattle, making it impossible to transport stably and ensuring safe work for the workers. There was also a risk that the rattle could have a negative impact on product quality.

[0006] In order to reduce the above-mentioned gap, as shown in Patent Document 1, it is known to change the relative positions of the towing attachment and the stopper dog by making the transport conveyor into a vertically movable path. However, in order to smoothly move the stopper dog to the runaway prevention position, the gap cannot be reduced to zero, and there is still a risk of rattling occurring.In addition, since the stopper dog only moves up and down at specific positions on the transport conveyor, it is difficult to change the position where the stopper dog faces and moves away from the conveyor.

[0007] As a conveying system 500b capable of eliminating gaps and sufficiently suppressing the occurrence of rattle, as shown in FIG. 5, a conveying abutment portion 513 of the stopper dog 550b facing the towing attachment C is made curved, and the distance from the center of the oscillating shaft 511 is changed in the vertical direction so that the upper part can pass without interfering with the towing attachment C, and the lower part interferes with the towing attachment C. As a result, even if there is an error in the position or shape of the towing attachment C, the stopper dog 550b is reliably in contact with the towing attachment C, and rattling due to a gap can be sufficiently suppressed. However, in the case of such a configuration, when the towing attachment C separates from the pressure surface 552 and the cart runs away when the transport conveyor 501 decelerates or stops, if the conveyor level in the line is affected or the inertial force of the cart is large, the towing attachment C may slip in the transport direction against the transport abutment part 513, causing the stopper dog 550b to swing downward, allowing the cart to run away.

[0008] The present invention solves the problems described above by providing a stopper dog and a conveying system which can eliminate the gap between the towing attachment and the stopper dog to reduce rattling when the cart is being conveyed, and can adequately prevent the cart from running away when the conveyor decelerates or stops or when the cart is being conveyed on an inclined section. [Means for solving the problem]

[0009] The stopper dog of the present invention is provided on a conveying conveyor or a cart, and is arranged opposite to the pusher dog that abuts against the towing attachment of the cart or conveying conveyor, so as to be able to abut against and disengage from the towing attachment, and has an abutment surface that abuts against the towing attachment and a swing shaft that swings the abutment surface between a standby position and a maximum swing position, the abutment surface having a conveying abutment portion and a runaway prevention portion provided on the maximum swing position side of the conveying abutment portion, the conveying abutment portion being formed so that the distance from the swing center of the swing shaft becomes smaller toward the maximum swing position side, and the runaway prevention portion being formed so that the distance from the swing center of the swing shaft becomes longer toward the maximum swing position side, thereby solving the above problem. In addition, the conveying system of the present invention is a conveying system having a conveying conveyor, a plurality of pusher dogs provided on the conveying conveyor or cart and abutting against a towing attachment of the cart or conveying conveyor, and a plurality of stopper dogs arranged opposite the pusher dogs from the opposite side so as to be able to abut against and be released from the towing attachment, and the plurality of stopper dogs include the above-mentioned stopper dogs, thereby solving the above-mentioned problem. Effect of the Invention

[0010] According to the stopper dog of claim 1 and the conveying system of claim 5, the conveying abutment portion of the abutment surface of the stopper dog is formed so that the distance from the swing center of the swing shaft becomes smaller toward the maximum swing position side, and the runaway prevention portion of the abutment surface of the stopper dog is formed so that the distance from the swing center of the swing shaft becomes longer toward the maximum swing position side, resulting in a structure in which the conveying abutment portion approaches the towing attachment as it swings toward the maximum swing position side, making it possible to reduce or eliminate the gap between the towing attachment and the stopper dog, reducing rattling during conveying of the cart, and even if the towing attachment slips in the conveying direction against the conveying abutment portion when the conveying conveyor decelerates or stops or when conveying on an inclined portion, the runaway prevention portion can abut against the towing attachment to prevent runaway.

[0011] According to the configuration of claim 2, the runaway prevention part has a flat portion that abuts against the towing attachment, and thus can receive the force of the towing attachment in the runaway direction, thereby reliably preventing runaway. According to the configuration described in claim 3, the transport abutment portion has a portion on the maximum swing position side through which the push dog can pass without interfering with the towing attachment when it is in contact with the towing attachment, and a portion on the standby position side which interferes with the towing attachment when it is in contact with the towing attachment of the cart due to its swing, thereby reliably eliminating any gap between the towing attachment and the stopper dog. According to the configuration described in claim 4, the runaway prevention portion is formed so that it can pass through the towing attachment without interfering with it by swinging when the pusher dog is in contact with the towing attachment as a whole, so that the stopper dog can be swung upward until the conveying abutment portion reliably abuts against the towing attachment when conveying begins. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is an explanatory diagram of a conveyance system having a stopper dog according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an explanatory diagram of the stopper dog of FIG. 1. [Diagram 3] 1 is an explanatory diagram of an operation of a conveying system according to an embodiment of the present invention; [Figure 4] FIG. 1 is an explanatory diagram of a conventional conveying system. [Diagram 5] FIG. 13 is an explanatory diagram of another transport system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] As shown in Figures 1 and 2, a conveying system 100 having a stopper dog 110, which is one embodiment of the present invention, comprises a conveying conveyor 101, a pusher dog 150 that is attached to the conveying conveyor 101 and abuts against a towing attachment C attached to the bottom of a cart (not shown), and a stopper dog 110 that faces the pusher dog 150 from the opposite side of the conveying direction of the cart and is arranged so as to be able to abut against and separate from the towing attachment C. A plurality of sets of pusher dogs 150 and stopper dogs 110 are provided for the transport conveyor 101, and the transport system 100 is configured to transport a plurality of carts at appropriate intervals along the transport path on which the transport conveyor 101 is installed.

[0014] The pusher dog 150 is configured so that a pressing surface 152 at the tip can swing up and down around a swing axis 151 from a standby position to a maximum swing position, and the pressing surface 152 abuts against the towing attachment C. When the transport conveyor 101 is driven, the pressing surface 152 of the pusher dog 150 pushes the towing attachment C, thereby transporting the cart. The stopper dog 110 is arranged to face the pusher dog 150, which abuts against the towing attachment C of the cart, from the opposite side in the transport direction of the cart so as to be able to abut against and detach from the towing attachment C, and has an abutment surface 112 that abuts against the towing attachment C, and is configured so that the abutment surface 112 at the tip can swing up and down around a swing shaft 111.

[0015] The contact surface 112 has a transport abutment portion 113 and an escape prevention portion 114 provided above the transport abutment portion 113 (toward the maximum swing position), and the transport abutment portion 113 is formed so that its distance from the swing center of the swing shaft 111 decreases toward the top, and the escape prevention portion 114 is formed so that its distance from the swing center of the swing shaft 111 increases toward the top.

[0016] In this embodiment, the uppermost part of the transport abutment part 113 follows a trajectory R2 shown by a dotted line in FIG. 2, and has a portion at the upper part that can pass without interfering with the towing attachment C by swinging when the pusher dog 150 abuts against the towing attachment C, and the lowermost part of the transport abutment part 113 follows a trajectory R3 shown by a dotted line in FIG. 2, and has a portion at the lower part (towards the standby position) that can interfere with the towing attachment C by swinging when the pusher dog 150 abuts against the towing attachment C.

[0017] In this embodiment, the runaway prevention section 114 has a flat section 115 that abuts against the towing attachment C of the trolley, and the uppermost part of the runaway prevention section 114 follows a trajectory R1 shown by the dotted line in Figure 2, and is formed so that when the pusher dog 150 abuts against the towing attachment C of the trolley, it can pass through without interfering with the towing attachment by swinging. In this embodiment, multiple sets of pusher dogs 150 and stopper dogs 110 are provided above the conveying conveyor 101, and a towing attachment C is provided under the cart (not shown), but the positional relationship between the conveying conveyor and the cart is not limited to this. In addition, a set of pusher dogs 150 and stopper dogs 110 may be provided on each cart, and a plurality of traction attachments C may be provided on the transport conveyor so as to protrude toward the cart, and the pusher dogs 150 may be pushed and transported by the traction attachments C provided on the transport conveyor.

[0018] The operation of the transport system 100 having the stopper dog 110 according to one embodiment of the present invention configured as above when transporting a cart will be described below. With both the pusher dog 150 and the stopper dog 110 of the transport conveyor 101 swinging upward, the transport conveyor 101 is driven in the left direction as shown in FIG. 3, approaches the towing attachment C provided at the bottom of the cart, and first comes into contact with the stopper dog 110. Then, the stopper dog 110 is pushed by the pulling attachment C and swings downward, and the transport conveyor 101 is driven in the left direction in the figure until the pulling attachment C abuts against the pressing surface 152 of the pusher dog 150.

[0019] The uppermost part of the runaway prevention section 114 follows the trajectory R1 shown by the dotted line in Figure 2, and the runaway prevention section 114 is formed so that it can pass through without interfering with the towing attachment C of the cart by swinging when the pusher dog 150 is in contact with the towing attachment C, so that the towing attachment C can get over the runaway prevention section 114 before it comes into contact with the pressing surface 152 of the pusher dog 150. Furthermore, the uppermost part of the transport abutment portion 113 follows the trajectory R2 shown by the dotted line in Figure 2, and has a portion above it that can pass through without interfering with the towing attachment C by swinging when the pusher dog 150 is in contact with the towing attachment C. Therefore, the towing attachment C can clear the upper part of the transport abutment portion 113 before it contacts the pressing surface 152 of the pusher dog 150.

[0020] On the other hand, the lowermost part of the transport abutment portion 113 follows the trajectory R3 shown by the dotted line in FIG. 2, and has a portion at the lower part that interferes with the traction attachment C due to the swinging motion when the pusher dog 150 abuts against the traction attachment C. Therefore, when the traction attachment C abuts against the pressing surface 152 of the pusher dog 150, as shown in FIG. 1, the traction attachment C comes into contact with the transport abutment portion 113 and there is no gap. In this state, the towing attachment C is pushed by the pressing surface 152 of the pusher dog 150 and is transported in the left direction in the figure by the driving of the transport conveyor 101, so that rattling during transport of the cart can be reduced. Furthermore, even if there is an error in the dimensions of the towing attachment C, an error in the vertical position, etc., the stopper dog 110 can be reliably swung upward to the position where it comes into contact with the conveying contact portion 113.

[0021] When the transport conveyor 101 decelerates or stops, or when transporting on an inclined portion, a force in the transport direction is applied from the traction attachment C to the transport abutment portion 113 of the stopper dog 110 due to the inertial force and gravity of the carriage. If this force is large, the traction attachment C and the transport abutment portion 113 slip, the stopper dog 110 swings downward, and the traction attachment C leaves the pressing surface 152 of the pusher dog 150 and moves further to the left in the figure than the transport conveyor 101. However, since the towing attachment C immediately comes into contact with the flat portion 115 of the runaway prevention portion 114 of the stopper dog 110 and receives a force in a direction in which the stopper dog 110 swings upward, the towing attachment C does not move beyond that position, and the trolley is reliably prevented from running away.

[0022] In the above embodiment, the lowermost part of the conveying contact portion 113 follows the trajectory of R3 shown by the dotted line in FIG. 2, and has a portion at the lower part that interferes with the towing attachment C due to swinging when the pusher dog 150 abuts against the towing attachment C. However, if R3 shown by the dotted line in FIG. 2 at the lowermost part of the conveying contact portion 113 is larger than R2 shown by the dotted line in FIG. 2 at the uppermost part of the conveying contact portion 113, then the upper part can reliably pass over the towing attachment C during swinging, and the gap between the towing attachment C at the lower part can be made extremely small. In addition, in the above embodiment, the runaway prevention portion 114 is provided with a flat portion 115, but any shape may be used as long as a component force that causes the stopper dog 110 to swing downward is not generated when the towing attachment C and the conveying abutment portion 113 slip and the stopper dog 110 swings downward and the towing attachment C abuts against the runaway prevention portion 114, or the shape does not allow the towing attachment C and the runaway prevention portion 114 to slip. The operation is also similar in the case where a set of pusher dogs 150 and stopper dogs 110 is provided at the bottom of each of the aforementioned carts with the lower side being the maximum swing position, and multiple traction attachments C are provided on the transport conveyor so as to protrude upward. [Explanation of symbols]

[0023] 100, 500...Transportation system 101, 501...Transport conveyor 110, 510 ··· Stopper Dog 111, 511... Swing shaft 112... Contact surface 113, 513 ..... conveying contact part 114, 514... Escape prevention section 115 ··· Flat part 150, 550 ··· Pusha Dog 151, 551... Swing shaft 152, 552 ... Pressing surface C. Towing attachment

Claims

1. A stopper dog is provided on a transport conveyor or a carriage, and is disposed to be capable of contacting and disengaging from the towing attachment, facing from the opposite side to a pusher dog that contacts the towing attachment of the carriage or the transport conveyor, and has a contact surface that contacts the towing attachment and a swing shaft that swings the contact surface between a standby position and a maximum swing position, the contact surface has a transport contact portion and a runaway prevention portion provided on the maximum swing position side of the transport contact portion, the transport contact portion is formed such that a distance from the swing center of the swing shaft decreases toward a maximum swing position side, The stopper dog is characterized in that the runaway prevention portion is formed so that the distance from the swing center of the swing shaft becomes longer toward the maximum swing position side.

2. 2. The stopper dog according to claim 1, wherein the runaway prevention portion has a flat portion that abuts against a towing attachment.

3. 2. The stopper dog according to claim 1, wherein the transport abutment portion has a portion on the maximum swing position side through which the push dog can pass without interfering with the towing attachment when the push dog abuts against the towing attachment, and a portion on the standby position side which interferes with the towing attachment when the push dog abuts against the towing attachment.

4. 2. The stopper dog according to claim 1, wherein the runaway prevention portion is formed so that the pusher dog can pass through the towing attachment without interfering with the towing attachment by swinging when the pusher dog is in contact with the towing attachment as a whole.

5. A conveying system including a conveyor, a plurality of pusher dogs provided on the conveyor or a carriage and abutting against a towing attachment of the carriage or the conveyor, and a plurality of stopper dogs arranged to face the pusher dogs from the opposite side and be capable of abutting against and being released from the towing attachment, 5. A transport system, wherein the plurality of stopper dogs include the stopper dog according to claim 1.

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