JP5062034B2 - Chain conveyor overload position indexing system - Google Patents

Description

  The present invention relates to an overload position indexing system for a chain conveyor that detects a location causing an overload condition when an overload condition is detected and the chain conveyor is stopped.

As a chain conveyor overload detection system, a drive unit of the chain conveyor includes a fixed frame, a movable frame movably provided on the fixed frame, a caterpillar chain provided on the movable frame and engageable with the drive chain; The rotary drive device interlocked with the caterpillar chain, and a compression coil spring provided between the fixed frame and the movable frame for receiving the movable frame that is moved by a load. The amount of movement of the movable frame relative to the fixed frame is measured by a laser displacement sensor. There is one that can detect an overload state by detecting (see, for example, Patent Document 1).
In addition, as a chain conveyor status detection system, the tension of the drive chain is measured with a strain gauge attached to the link of the drive chain, the measured value is transmitted by a transmitter, and the position of the transmitter is triangulated by three receivers. There is a thing provided with the controller calculated | required by (for example, refer patent document 2).

JP 2000-6791 A (FIGS. 1-2) US Pat. No. 7,325,669 (FIG. 1-3)

In the overload detection system for a chain conveyor as in Patent Document 1, an overload state can be detected by detecting the amount of movement of the movable frame in the drive unit. Cannot be determined.
Therefore, for example, when a carrier or loaded work is caught by an interference object and an excessive load is applied to the drive unit, and this overload state is detected and the drive unit is stopped, maintenance personnel sequentially check the conveyor path while checking it. It is necessary to find a place that is caught by an interferer that is a part that turns and causes an overload condition.
Therefore, since much labor and time are required to determine the location causing the overload state, the stop time of the conveyor becomes long, so that productivity is lowered.
In addition, since there may be places in the conveyor path where it is difficult for maintenance personnel to approach, in this case, more labor and time are required, and maintenance personnel are forced to perform dangerous work. In some cases.

  Moreover, in the state detection system of the chain conveyor like patent document 2, while detecting the tension state of the drive chain to which the strain gauge is attached, the position of the transmitter that has transmitted the state can be obtained by triangulation. For example, even when the overload state is detected by a system such as Patent Document 1 and the drive unit is stopped, even if the tension state of the drive chain to which the strain gauge is attached is detected and the position thereof is specified, It does not lead to the index of the location causing the condition.

  Therefore, in view of the above-mentioned situation, the present invention intends to solve the problem of relatively easily determining the location causing the overload condition when the overload condition is detected and the chain conveyor is stopped. Therefore, the present invention is to provide an overload position indexing system for a chain conveyor that can shorten the conveyor stop time and improve the productivity.

  In order to solve the above problem, the chain conveyor overload position indexing system according to the present invention is driven and controlled by the conveyor control device, and detects the overload state and stops the chain conveyor. An overload position indexing system for a chain conveyor for determining a cause, a fixed frame fixed on the ground side, a movable frame supported so as to be movable in the front-rear direction with respect to the fixed frame, A driving device that is supported by the movable frame and that applies a driving force by engaging with a driving chain, and an elastic support means that is provided between the fixed frame and the movable frame and receives the movable frame that moves according to a load. A drive unit comprising: an overload detector that detects that the movable frame has moved beyond a predetermined value relative to the fixed frame; and a predetermined distance from the drive chain, In response to a request signal from a transmitter installed on the upper side, a plurality of tension transmitters that transmit tension data corresponding to the tension number of the ID number and the drive chain, and radio waves from the tension transmitters Three or more receivers arranged on the ground side so that they can be received simultaneously, a position calculation device that calculates the position of the tension transmitter from a radio field intensity received by the receiver by a three-point surveying method, When the overload detector detects the overload state of the drive chain and the conveyor control device stops the chain conveyor, it is adjacent in the front-rear direction by the tension data from the tension transmitter in the overload state A tube that calculates the tension difference of the drive chain at the position of the tension transmitter and indicates the position of the adjacent tension transmitter whose calculated value is larger than the tension difference in the normal operation state It is obtained by a computer.

  Moreover, the overload position indexing system for the chain conveyor according to the present invention is driven and controlled by the conveyor control device in order to solve the above problem, and when the overload state is detected and the chain conveyor is stopped, the overload is detected. An overload position indexing system for a chain conveyor for determining a location causing a state, a fixed frame fixed on the ground side, and a movable frame supported so as to be movable in the front-rear direction with respect to the fixed frame A driving device that is supported by the movable frame and that engages with a driving chain to apply a driving force, and an elasticity that is provided between the fixed frame and the movable frame and that receives the movable frame that moves according to a load. A drive unit comprising support means, an overload detector for detecting that the movable frame has moved beyond a predetermined value with respect to the fixed frame, and a predetermined distance attached to the drive chain In response to a request signal from a transmitter installed on the ground side, a plurality of tension transmitters that transmit tension data corresponding to the tension number of the ID number and the drive chain, and the tension transmitters Installed at a predetermined place on the ground side, a receiver disposed on the ground side for receiving the radio wave, a pulse transmitter attached to the drive device of the drive unit, an origin dog attached to the drive chain, and Further, an origin detector for detecting the passage of the origin dog, and the pulse transmitter when the overload detector detects an overload state of the drive chain by the overload detector and the conveyor control device stops the chain conveyor. The position of the tension transmitter is calculated from the number of pulses and the number of pulses from the origin dog of the tension transmitter, and the tension transmitter in the overload state The tension difference of the drive chain at the position of the tension transmitter adjacent in the front-rear direction is calculated from the tension data, and the position of the adjacent tension transmitter where the calculated value is larger than the tension difference in the normal operation state is calculated. The management computer shown is provided.

The chain conveyor overload position indexing system according to the present invention is driven and controlled by the conveyor control device, and causes an overload condition when the chain conveyor is stopped by detecting the overload condition. An overload position indexing system for a chain conveyor that indexes a position, a fixed frame fixed on the ground side, a movable frame supported so as to be movable in the front-rear direction with respect to the fixed frame, and supported by the movable frame A drive unit that engages with the drive chain to apply a drive force, and a drive unit that is provided between the fixed frame and the movable frame and includes elastic support means that receives the movable frame that moves according to a load. An overload detector that detects that the movable frame has moved beyond a predetermined value relative to the fixed frame; and an overload detector attached to the drive chain at a predetermined distance and installed on the ground side. In response to a request signal from the transmitter, a plurality of tension transmitters that transmit tension data corresponding to the tension number of the ID number and the drive chain, and radio waves from the tension transmitters can be received simultaneously. Three or more receivers arranged on the ground side, a position calculation device for calculating the position of the tension transmitter from the radio field intensity received by the receiver by a three-point survey method, and the overload detector When the conveyor controller detects the overload state of the drive chain and stops the chain conveyor, the position of the tension transmitters adjacent in the front-rear direction by the tension data from the tension transmitter in the overload state A management computer indicating a position of the adjacent tension transmitter, wherein the calculated tension difference of the drive chain is greater than the tension difference in a normal operation state; When the chain conveyor is stopped by detecting an overload condition, the adjacent tension in which the tension difference of the drive chain at the position of the tension transmitter adjacent in the front-rear direction is larger than the tension difference in the normal state It can be seen that there is a place causing the overload state between the positions of the transmitter, and the position of the tension transmitter can be easily obtained by calculation based on the three-point survey method by the position calculation device.
Therefore, when the overload condition is detected and the chain conveyor is stopped, the management computer displays the position of the tension transmitter before and after the location causing the overload condition. Since it is possible to relatively easily determine the locations, it is possible to shorten the conveyor stop time and improve productivity.

Further, according to the overload position indexing system for the chain conveyor according to the present invention, the drive control is performed by the conveyor control device, and when the overload state is detected and the chain conveyor is stopped, the overload state is caused. An overload position indexing system for a chain conveyor, wherein a fixed frame fixed to the ground side, a movable frame supported so as to be movable in the front-rear direction with respect to the fixed frame, and the movable frame Drive comprising: a supported drive device that engages a drive chain to apply a drive force; and an elastic support means that is provided between the fixed frame and the movable frame and receives the movable frame that moves according to a load. And an overload detector that detects that the movable frame has moved beyond a predetermined value with respect to the fixed frame, and is attached to the drive chain at a predetermined distance and installed on the ground side. A plurality of tension transmitters that transmit tension data corresponding to the ID number and the magnitude of the tension of the drive chain in response to a request signal from the transmitter, and a ground that receives radio waves from the tension transmitters A receiver disposed on the side, a pulse transmitter attached to the drive device of the drive unit, an origin dog attached to the drive chain, and the origin dog installed at a predetermined location on the ground side An origin detector for detecting passage, and the number of pulses of the pulse transmitter and the tension when the overload state of the drive chain is detected by the overload detector and the conveyor control device stops the chain conveyor. Calculate the position of the tension transmitter from the number of pulses from the origin dog of the transmitter, and tension data from the tension transmitter in the overload state A management computer that calculates the tension difference of the drive chain at the position of the tension transmitters adjacent in the front-rear direction, and indicates the position of the adjacent tension transmitter in which the calculated value is larger than the tension difference in the normal operation state; When the chain conveyor is stopped by detecting an overload condition, the tension difference of the drive chain at the position of the tension transmitter adjacent in the front-rear direction is larger than the tension difference in the normal state. It can be seen that there is a place causing an overload condition between the tension transmitter positions, and the position of the tension transmitter is determined from the number of pulses from the pulse transmitter and the number of pulses from the origin dog of the tension transmitter. It can be easily obtained.
Therefore, when the overload condition is detected and the chain conveyor is stopped, the management computer displays the position of the tension transmitter before and after the location causing the overload condition. Since it is possible to relatively easily determine the locations, it is possible to shorten the conveyor stop time and improve productivity.
In addition, since the position of the tension transmitter is not obtained by the three-point surveying method, the number of receivers does not have to be three or more. Therefore, the number of receivers can be reduced, and the position calculation device. The hardware and the calculation software for the three-point surveying method are not necessary, so that the cost can be reduced.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and includes all the embodiments that satisfy the requirements described in the claims. . In this specification, the moving direction (see arrow F in the figure) side of the power chain 3 that is a driving chain for applying a driving force to the transport carrier 9 is the front, and the left and right are the front.
In the following embodiments, an overhead conveyor will be described as an example of the chain conveyor 1, but the chain conveyor 1 may be a floor conveyor.

Embodiment 1 FIG.
1 to 5 are schematic diagrams showing the configuration of an overload position indexing system for a chain conveyor 1 according to Embodiment 1 of the present invention. FIG. 1 is an overall configuration diagram, FIG. 2 is a tension transmitter S1 and FIG. 3 is a block diagram showing the configuration of the tension transmitter S1, FIG. 4 is an explanatory diagram of the three-point surveying method, and FIG. 5 is the power at the position of the tension transmitters S1, S2,. It is a figure which shows the relationship between the tension | tensile_strength of the chain 3, and the distance from the drive part 10, FIG.5 (a) is an example of a normal operation state, FIG.5 (b) is the state which stopped the chain conveyor 1 by overload. An example is shown. Further, the path of the power chain 3 in FIG. 1 is a plan view.

As shown in FIG. 1 and FIG. 2, a chain conveyor 1 that is a so-called power and free overhead conveyor is provided with a power rail 2 and a free rail 6 on the upper and lower sides along a conveyance path. The power chain 3, which is a drive chain, is supported by the engaging power trolleys 4,..., And the transport carrier 9 is supported by the free trolleys 7,.
In addition, a drive dog 5 that swings about the left and right axis is attached to the power rail 3 between the power trolleys 4 and 4 that are close to each other, and a free trolley 7 at the tip is driven to be engaged with the drive dog 5. Dog 8 is formed.

Next, a configuration example of the drive unit 10 will be described.
The drive unit 10 engages with a fixed frame 11 fixed on the ground side, a movable frame 12 supported so as to be movable in the front-rear direction with respect to the fixed frame 11, and a power chain 3 supported by the movable frame 12. Depending on the load provided between the fixed frame 11 and the movable frame 12, for example, a caterpillar chain 13 that is a driving device that applies a driving force and a geared motor that is provided with a brake that is a rotational driving device that drives the caterpillar chain 13. Since the caterpillar chain 13, which is composed of a compression coil spring 14, which is an elastic support means for receiving the movable frame 12 that moves and is driven by the rotation driving device, is engaged with the power chain 3, the power chain 3 is moved in the conveying direction ( (See arrow F in the figure.)
Therefore, the transport carrier 9 with the driven dog 8 engaged with the drive dog 5 is pulled by the power chain 3 and moves in the transport direction.

Further, the drive unit 10 is provided with an unillustrated limit switch, a displacement sensor, or the like, which is an overload detector that detects that the movable frame 12 has moved beyond a predetermined value with respect to the fixed frame 11. Therefore, when an overload state is detected by the overload detector, the chain conveyor 1 is stopped by a command from the conveyor control device 20.
The drive unit 10 is not a so-called caterpillar drive (caterpillar chain drive mechanism) as shown in FIG. 1, but a drive sprocket provided on the movable frame 12 and engaged with the power chain 3 is driven by a rotary drive device. A so-called sprocket drive may be used.

As shown in FIG. 1, tension transmitters S1, S2,..., S7 are attached to the power chain 3 at a predetermined distance in the front-rear direction (equal intervals in the example shown in FIG. 1). The tension transmitters S1, S2,..., S7 transmit tension data corresponding to the ID number and the magnitude of the tension of the power chain 3 in response to a request signal from the transceiver TR installed on the ground side.
Further, on the ground side, a transmitter / receiver TR and a receiver R1 which are three receivers (may be three or more) capable of simultaneously receiving radio waves from the tension transmitters S1, S2,. , R2 are provided, and data received by the transceiver TR and the receivers R1, R2 is sent to a position calculation device 16 and a management computer 17 to be described later in detail via a LAN (Local Area Network) 15.
In the transceiver TR, the transmitter and the receiver may be separate. Further, the number of tension transmitters S1, S2,..., S7 is not limited to seven, but may be two or more, but the number of these tension transmitters may be increased to narrow the interval between the front and rear tension transmitters. The greater the accuracy, the better the indexing accuracy of the location causing the overload state by the overload indexing system described later.

Next, configuration examples of the tension transmitters S1, S2,..., S7 will be described.
As shown in FIGS. 2 and 3, the tension transmitter S1 (the other tension transmitters S2,..., S7 have the same configuration) has a configuration in which center links 3A and side links 3B, 3B are alternately connected. The tension type load cell 21 which is a tension detection unit and the calculation / transmission unit 22 which are respectively attached to the center links 3A and 3A adjacent to the front and rear of the power chain 3 are connected by a cable 23.
Here, the calculation / transmission unit 22 processes the output signal of the transmission circuit 22C for transmitting data wirelessly and the tension load cell 21 and corresponds to the magnitude of the tension of the power chain 3 based on this output signal. It comprises an arithmetic unit 22A that performs control and the like for transmitting tension data and an ID number from the transmission circuit 22C, and a battery 22B for supplying power.

Next, the three-point survey method will be described.
When the overload detector of the drive unit 10 detects an overload and the conveyor control device 20 stops the chain conveyor 1, in response to a request signal transmitted from the transmitter / receiver TR at a constant cycle or an overload occurrence According to the transmitted request signal, for example, the tension data and the ID number are transmitted from the tension transmitter S1, but as shown in FIG. 4, the radio waves of the tension transmitter S1 received by the three receivers TR, R1, and R2. From the strength, the position calculation device 16 can calculate and determine the position of the tension transmitter S1 in the horizontal plane (XY plane) using calculation software of a well-known three-point surveying method.

Next, the indexing of the location causing the overload state will be described.
The position of the power chain 3 (tension transmitters S1, S2,..., S7) shown in FIG. 1 when the chain conveyor 1 is operating normally without the overload detector of the drive unit 10 detecting an overload. If the distance from the drive unit outlet OUT in this case to the position of the tension transmitter S7, the position of the tension transmitter S6 or the position of the tension transmitter S1, and the distance from the drive unit inlet IN is the horizontal axis, the tension transmitter When the chain tension detected by S1, S2,..., S7 is plotted on the vertical axis, the result is as shown in FIG.
That is, in such a normal operation state, since the tension transmitters S1, S2,..., S7 are attached to the power chain 3 at equal intervals, the tension of the power chain 3 at the position of the tension transmitter adjacent in the front-rear direction. Difference TN, for example, [(tension at the position of the tension transmitter S1) − (tension at the position of the tension transmitter S2)], [(tension at the position of the tension transmitter S2) − (tension at the position of the tension transmitter S3) )],... [(Tension at the position of the tension transmitter S6) − (tension at the position of the tension transmitter S7)] is constant.

On the other hand, when there is an overload occurrence location A, when the overload detector of the drive unit 10 detects overload and the conveyor control device 20 stops the chain conveyor 1, the power chain 3 (tension transmission) If the machines S1, S2,..., S7) are at the positions shown in FIG. 1, the position of the tension transmitter S7 or the position of the tension transmitter S1 from the drive unit outlet OUT to the downstream side in this case, FIG. 5B shows the chain tension detected by the tension transmitters S1, S2,..., S7 plotted on the vertical axis with the distance to the drive unit IN as the horizontal axis.
That is, since there is an overload occurrence location A, the position of the tension transmitter S3 or the tension transmitter S7 located upstream of the overload occurrence location A and downstream of the drive unit 10 when the chain conveyor 1 is stopped. The tension of the position and the power chain 3 at the drive unit outlet OUT becomes zero.

Thus, the tension difference TS between the tension transmitters S2 and S3 positioned before and after the overload occurrence point A, ie, [(tension at the position of the tension transmitter S2) − (the position of the tension transmitter S3). Tension)] is larger than the tension difference TN in the normal operation state.
Therefore, when the chain conveyor 1 is stopped by detecting an overload state, the tension difference of the power chain 3 at the position of the tension transmitter adjacent in the front-rear direction is larger than the tension difference TN in the normal state. It can be seen that there is a location (for example, A) that causes an overload condition between the positions of the tension transmitters (for example, S2 and S3), and the tension based on the calculation based on the three-point survey method by the position calculation device 16 The position of the transmitter (for example, S2, S3) in the horizontal plane can be easily obtained.

Accordingly, when the overload state is detected and the chain conveyor 1 is stopped, the management computer 17 displays, for example, a tension transmitter before and after the location (for example, A) causing the overload state on the monitor. By displaying the position of (for example, S2, S3), it is possible to relatively easily determine the location (for example, A) that is causing the overload condition. Can be improved.
Since the installation positions of the tension transmitters S1, S2,..., S7 in the power chain 3 are not changed, one position of the adjacent tension transmitters (for example, S2, S3) is calculated by the above-mentioned three-point survey method. Thus, the other position may be calculated by the management computer 17.

Embodiment 2. FIG.
6 to 9 are schematic views showing the configuration of the overload position indexing system for the chain conveyor 1 according to Embodiment 2 of the present invention, FIG. 6 is an overall configuration diagram, and FIG. 7 is the tension transmitter S1, FIG. 8 is a diagram showing the relationship between the number of pulses from the origin of S2,... And the number of pulses indicating the current position of the tension transmitters S1, S2,. FIG. 9 (a) is a diagram showing the relationship between the current position of the tension transmitters S1, S2,... And the chain tension in the same state, and FIG. 9 (b) is the tension transmitters S1, S2 in the same state. ,... Are diagrams showing the relationship between the tension of the power chain 3 at the position of the power chain 3 and the distance from the drive unit 10, and the same reference numerals as those in FIGS. 1 to 5 of the first embodiment denote the same or corresponding parts.

The tension transmitters S1, S2,..., S7 shown in FIG. 6 are similar to the first embodiment in that the tension of the ID number and the power chain 3 is determined according to a request signal from the transceiver TR installed on the ground side. The tension data corresponding to the magnitude is transmitted, and the receiver in the second embodiment is only the transceiver TR.
Data transmitted from the tension transmitters S1, S2,..., S7 and received by the transmitter / receiver TR are sent via the LAN 15 to the management computer 17 described later in detail.
In the transceiver TR, the transmitter and the receiver may be separate.

The power chain 3 that is a drive chain has an origin dog 18A attached to an arbitrary position (between the tension transmitter S5 and the tension transmitter S6 in the present embodiment) at a predetermined position on the ground side. Is provided with, for example, a limit switch 18B which is an origin detector for detecting the passage of the origin dog 18A.
A pulse transmitter 19 is attached to the drive device of the drive unit 10 (for example, a rotary drive device that drives the caterpillar chain 13), and when the limit switch 18B detects the passage of the origin dog 18A and is turned on, The pulse count of the pulse transmitter 19 is set to zero in order to prevent accumulation of count errors.
Here, the pulse transmitter 19 and the limit switch 18 </ b> B are connected to the conveyor control device 20 or the management computer 17.

  In this embodiment, one round of the power chain 3 is 2800 pulses. As shown in FIG. 7, the number of pulses from the origin dog 18A of the tension transmitters S5, S4,..., S1, S7, S8 is 200, 600,..., 1800, 2200, 2600, and the current positions of these tension transmitters, which are the number of pulses from the limit switch 18B that is the origin detector, are the current pulse number of the pulse transmitter 19 and the origin dog. This is the sum of the number of pulses from 18A (when 2800 is exceeded, 2800 is subtracted).

Next, as shown in FIG. 8, the overload occurrence point B is between the tension transmitter S1 and the tension transmitter S2, and the overload detector of the drive unit 10 detects the overload state, and the conveyor control device 20 The example of the state which stopped the chain conveyor 1 is demonstrated.
If the chain conveyor 1 stops in the state shown in FIG. 8 and the current pulse of the pulse transmitter 19 at this time is 1600 pulses, the current positions of the tension transmitters S1, S2,. Can be sought.
That is, the current position of the tension transmitter S1 is 1600 + 1800-2800 = 600 pulses, the current position of the tension transmitter S2 is 1600 + 1400-2800 = 200 pulses, and the current position of the tension transmitter S3 is 1600 + 1000 = 2600 pulses. The current position of the tension transmitter S4 is 1600 + 600 = 2200 pulses, the current position of the tension transmitter S5 is 1600 + 200 = 1800 pulses, and the current position of the tension transmitter S6 is 1600 + 2600-2800 = 1400 pulses. The current position of the machine S7 is 1600 + 2200-2800 = 1000 pulses, which is the value shown in FIG.

In such an overload state, according to a request signal from the transmitter / receiver TR, tension data corresponding to the tension number of the ID number and the power chain 3 is transmitted from the tension transmitters S1, S2,. Therefore, for example, as shown in FIG. 9A, the tension of the power chain 3 at the positions of the tension transmitters S1, S2,.
Therefore, in this case, the distance (2200 pulses) that is the current position of the tension transmitter S4 from the distance (2000 pulses) that is the fixed position of the drive unit outlet OUT to the downstream side thereof, or the above-mentioned of the tension transmitter S5. When the distance (1800 pulses) that is the current position and the distance (2000 pulses) that is the fixed position of the drive unit inlet IN are plotted on the horizontal axis, the chain tension detected by the tension transmitters S1, S2,. As shown in FIG.

That is, since there is an overload occurrence point B, when the chain conveyor 1 is stopped, the position of the tension transmitter S2 or the tension transmitter S4 located upstream of the overload occurrence point B and downstream of the drive unit 10 The tension of the position and the power chain 3 at the drive unit outlet OUT becomes zero.
Thus, the tension difference TS between the positions of the tension transmitters S1 and S2 positioned before and after the overload occurrence point B, that is, [(tension at the position of the tension transmitter S1) − (the position of the tension transmitter S2). Tension)] is larger than the tension difference TN in the normal operation state (see FIG. 5A of the first embodiment).

  Therefore, when the chain conveyor 1 is stopped by detecting an overload state, the tension difference of the power chain 3 at the position of the tension transmitter adjacent in the front-rear direction is larger than the tension difference TN in the normal state. It can be seen that there is a location (for example, B) that causes an overload condition between the positions of the tension transmitter (for example, S1, S2), and the number of pulses of the pulse transmitter 19 and the tension transmitter (for example, S1). , S2), the position of the tension transmitter (for example, S1, S2) can be easily obtained from the number of pulses from the origin dog 18A.

Therefore, when the overload state is detected and the chain conveyor 1 is stopped, the management computer 17 displays, for example, a tension transmitter before and after the location (for example, B) causing the overload state on the monitor. By displaying the position of (for example, S1, S2), it is possible to relatively easily determine the location (for example, B) that is causing the overload condition. Can be improved.
In addition, since the position of the tension transmitters S1, S2,..., S7 is not obtained by the three-point survey method as in the first embodiment, the number of receivers may not be three or more. The number of receivers can be reduced, and the hardware of the position calculation device 16 (see FIG. 1 of the first embodiment) and the calculation software of the three-point survey method are not necessary, thereby reducing the cost. it can.

It is a whole block diagram of the overload position indexing system of the chain conveyor which concerns on Embodiment 1 of this invention. It is a principal part enlarged view around a tension transmitter and a conveyance carrier. It is a block diagram which shows the structure of a tension transmitter. It is explanatory drawing of a three-point surveying method. It is a figure which shows the relationship between the tension | tensile_strength of the power chain of the position of a tension transmitter, and the distance from a drive part, (a) is an example of a normal operation state, (b) is the state which stopped the chain conveyor by overload An example is shown. It is a whole block diagram of the overload position indexing system of the chain conveyor which concerns on Embodiment 2 of this invention. It is a figure which shows the relationship between the pulse number from the origin of a tension transmitter, and the pulse number which shows the present position of a tension transmitter. It is explanatory drawing which shows the example of a state which stopped a chain conveyor by overload. (A) is a diagram showing the relationship between the current position of the tension transmitter and the chain tension when the chain conveyor is stopped due to overload, and (b) is the tension of the power chain at the position of the tension transmitter in the same state. It is a figure which shows the relationship with the distance from a drive part.

Explanation of symbols

A, B Overload occurrence location R1, R2 Receiver S1, S2, S3, S4, S5, S6, S7 Tension transmitter TR Transceiver TN Normal tension difference TS Tension difference at overload 1 Chain conveyor 3 Power chain ( Drive chain)
DESCRIPTION OF SYMBOLS 10 Drive part 16 Position calculating device 17 Management computer 18A Origin dog 18B Limit switch (origin detector)
19 Pulse transmitter 20 Conveyor controller 21 Load cell (tension detector)
22 Calculation / Transmission Unit

Claims (2)

An overload position indexing system for a chain conveyor, which is driven and controlled by a conveyor control device, and when the overload state is detected and the chain conveyor is stopped, the location causing the overload state is determined,
A fixed frame fixed to the ground side, a movable frame supported so as to be movable in the front-rear direction with respect to the fixed frame, a driving device that is supported by the movable frame and that applies a driving force by engaging with a driving chain; In addition, a drive unit that is provided between the fixed frame and the movable frame and includes elastic support means that receives the movable frame that moves according to a load;
An overload detector that detects that the movable frame has moved beyond a predetermined value with respect to the fixed frame;
In response to a request signal from a transmitter installed on the ground side at a predetermined distance to the drive chain, a plurality of ID data and tension data corresponding to the magnitude of the tension of the drive chain are transmitted. A tension transmitter,
Three or more receivers arranged on the ground side so that radio waves from the tension transmitter can be received simultaneously;
A position calculation device for calculating the position of the tension transmitter from a radio wave intensity received by the receiver by a three-point survey method;
When the overload detector detects the overload state of the drive chain and the conveyor control device stops the chain conveyor, it is adjacent in the front-rear direction by the tension data from the tension transmitter in the overload state. Calculating the tension difference of the drive chain at the position of the matching tension transmitter, and the calculated value is larger than the tension difference in the normal operation state, the management computer indicating the position of the adjacent tension transmitter;
An overload position indexing system for a chain conveyor, comprising: An overload position indexing system for a chain conveyor, which is driven and controlled by a conveyor control device, and when the overload state is detected and the chain conveyor is stopped, the location causing the overload state is determined,
A fixed frame fixed to the ground side, a movable frame supported so as to be movable in the front-rear direction with respect to the fixed frame, a driving device that is supported by the movable frame and that applies a driving force by engaging with a driving chain; In addition, a drive unit that is provided between the fixed frame and the movable frame and includes elastic support means that receives the movable frame that moves according to a load;
An overload detector that detects that the movable frame has moved beyond a predetermined value with respect to the fixed frame;
In response to a request signal from a transmitter installed on the ground side at a predetermined distance to the drive chain, a plurality of ID data and tension data corresponding to the magnitude of the tension of the drive chain are transmitted. A tension transmitter,
A receiver disposed on the ground side for receiving radio waves from the tension transmitter;
A pulse transmitter attached to the drive unit of the drive unit;
An origin dog attached to the drive chain;
An origin detector installed at a predetermined location on the ground side for detecting the passage of the origin dog;
The number of pulses of the pulse transmitter and the pulse from the origin dog of the tension transmitter when the overload detector detects the overload state of the drive chain and the conveyor control device stops the chain conveyor. The position of the tension transmitter is calculated from the number, and the tension difference of the drive chain at the position of the tension transmitter adjacent in the front-rear direction is calculated from the tension data from the tension transmitter in the overload state. A management computer indicating the position of the adjacent tension transmitter, the value of which is greater than the tension difference in a normal operating state;
An overload position indexing system for a chain conveyor, comprising:

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