JP2011026092A - Assembled condition recognition device for assembled structure, and crane using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device having improved reliability, which is used for a structure consisting of a plurality of assembled structural components, such as a crane boom, to recognize the assembled condition of whether an order of assembly is wrong or not by means of a host device mounted on one of the structural components of a crane body for acquiring attribute information for a client device mounted on the remaining structural component of the boom. <P>SOLUTION: For power source lines 9a, 9b between the host device 5 and the client device 6, series circuits consisting of load resistances 55, 65 for giving load variations thereto and switch elements 56, 66 are provided on the transmission sides, high pass filters 57, 67 for extracting signal components transmitted from the load variations are provided on the reception sides, and another backup communication passage using the power source lines 9a, 9b is provided, separately from a communication passage using a signal line 9c. Thus, even when a signal passage is cut off by breakage or connector-off, backup communication is actualized to maintain recognizing performance. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an apparatus for recognizing an assembly state of an assembly structure such as a boom of a crane and the crane using the same.

  In mechanical devices composed of various parts, the desired functions and performance cannot be achieved unless these parts are assembled correctly. Here, assembling refers to the type of part, the position of the part, the order of connection, and the like. For example, in a lattice boom crane which is one of construction machines, a long boom is configured by connecting many unit booms, thereby exhibiting the capability as a crane. However, the unit specifications used for each unit boom (length, weight, etc.) and their connection order are stipulated by the crane's mechanical specifications, and if they are not assembled correctly, Not only cannot the function and performance be exhibited, but in some cases, the operating machine may become unstable.

  From such a viewpoint, for example, a technique described in Patent Document 1 has been proposed. According to the prior art, a recording device (client device) in which unique attribute information is recorded is installed for each unit boom, and the attribute information is transmitted to a control device of the machine body (in the publication, an overload prevention device: a host device). ) Automatically recognizes whether the correct parts are connected in the correct order (whether the model is different or not).

JP-A-7-33386

  However, it is not uncommon for such a recognition device to fail in construction machines used in harsh conditions. For example, in an environment where there is a lot of dust on the open air, contact failure occurs due to the occurrence of dew condensation on the connector terminal part or adhesion of dust, or the wiring is caught somewhere, causing disconnection or disconnection of the connector. Alternatively, the recording apparatus itself may fail due to vibration or collision. Therefore, when these problems occur, the parts are not correctly recognized despite the fact that the structure is correctly assembled, so that the warning continues to sound or the use of the machine is locked.

  An object of the present invention is to provide an assembly state recognition device for an assembly structure that can recognize an assembly state of a plurality of structural parts with high reliability, and a crane using the same.

  An assembly state recognition apparatus for an assembly structure according to the present invention is a client device in which a host device mounted on any one of the structural components is mounted on the remaining structural components in a structure formed by assembling a plurality of structural components. In the apparatus that recognizes the assembled state by acquiring the attribute information, the host apparatus and the client apparatus are connected to each other by a pair of power supply lines and signal lines, and communication means included in each of them is provided. Communication is performed via the signal line, and a signal generation unit that generates a signal to be transmitted on the transmission side of the host device and the client device, and causes the communication unit to transmit via the signal line; Load means for applying a load to the power supply line corresponding to the signal to be transmitted created by the signal creation means, and the host device and the client device A signal processing means for decoding a signal received by the communication means via the signal line, and a signal processing means for extracting a transmitted signal component from a load fluctuation of the power line. It is characterized by comprising an extracting means for giving to the above.

  According to said structure, it is used for the structure which assembles | assembles several structural components like the boom of a crane, etc., and the host apparatus mounted in either of each said structural components, such as a crane main body, is said boom etc. By acquiring the attribute information of the client device mounted on the remaining structural parts of the device, it is possible to recognize the assembly state such as whether the assembly order is wrong or not, between the host device and the client device. , + Or − and GND are mutually connected by a pair of power supply lines and signal lines, and communication means included in each communicates via the signal lines, it should be noted that the signal lines by the communication means are In addition to the communication path used, another backup communication path using the power line is provided. Specifically, a signal to be transmitted is generated on the transmission side which is one of the host device and the client device, and the signal is generated together with the signal generation unit which causes the communication unit to transmit the signal via the signal line. Corresponding to the signal to be transmitted created by the creating means, a load means for applying a load to the power supply line is provided, and on the other receiving side, the signal received by the communication means via the signal line And an extraction means for extracting the transmitted signal component from the load fluctuation of the power supply line and applying the extracted signal component to the signal processing means.

  Therefore, even if the signal path is interrupted due to disconnection of the signal line or disconnection of the connector, backup communication of the attribute information can be realized using the power line and the recognition function can be maintained. Thereby, the reliability can be improved.

  In the assembly state recognition apparatus for an assembly structure according to the present invention, the signal creating means drives the load means to communicate the attribute information when communication failure occurs by the communication means.

  According to the above configuration, only when a communication failure such as a non-response on the receiving side occurs during communication using the communication unit, the signal generation unit drives the load unit and the attribute information Perform backup communication.

  Furthermore, in the assembly state recognition device for an assembly structure according to the present invention, the load means comprises a series circuit of a load resistor and a switch element interposed between a pair of the power supply lines of + or-and GND, The load variation is realized by opening and closing the switch element, and load resistances in the client device are set to different resistance values.

  According to the above configuration, when configuring the load means for realizing the load fluctuation of the power supply line, the load resistance interposed between the pair of power supply lines of + or − and GND and the switch element are connected in series. When configured with a circuit, the load resistance in the client device is set to a different resistance value.

  Therefore, on the host device side, by comparing the level of the voltage drop of the + or − side power supply line, that is, the resistance value with a predetermined set value, it is possible to determine which client device cannot communicate with the signal line. Can be detected.

  In the assembly state recognition apparatus for an assembly structure according to the present invention, the load resistance is set to a resistance value having a prime number relationship with each other.

  According to the above configuration, depending on the resistance value setting, the voltage drop level between the case where a plurality of client devices perform backup communication using the power supply line simultaneously and the case where one unit performs backup communication. However, such a case can be eliminated by setting the resistance values to values that are in a prime relationship with each other.

  Therefore, even when there are a plurality of client devices performing backup communication using the power line, each can be accurately identified.

  Furthermore, in the assembly state recognition apparatus for an assembly structure according to the present invention, a plurality of the client devices are grouped, and the resistance value is set for each group.

  According to the above configuration, when there are a large number of client devices, the resistance value is set for each group.

  Therefore, even when there are a large number of client devices, the types of resistance values can be reduced.

  In the assembly state recognition apparatus for an assembly structure according to the present invention, the client device includes a switch element for supplying power to a subsequent client device on the + or − power supply line side, and the host device side has its own device. When the recognition is performed, the switch element is closed to supply power to the subsequent client device, and the subsequent client device is recognized.

  According to the above configuration, when a plurality of client devices are connected in cascade from the host device, each client device is provided with a power feeding switch element, and when the host device is recognized by the host device, Power is supplied to the client device so that the subsequent client device is recognized.

  Therefore, it is possible to acquire the attribute information in order from the side close to the host device and recognize whether or not a plurality of cascade-connected client devices are assembled in the desired assembly order.

  Furthermore, the crane according to the present invention is characterized in that the assembly state recognition device for an assembly structure is used at least for a boom portion.

  According to said structure, a large sized lattice boom crane connects many unit booms, comprises a boom, and uses the said assembly state recognition apparatus for the confirmation of the connection order of each unit boom, or a connection leak. Thus, the assembly state can be easily confirmed, and the construction machine used in a harsh situation can be confirmed with high reliability. In the crane, the assembly state recognition device can be used for a counterweight that is mounted on the opposite side of the boom of the main body, and whose mounting amount changes according to the length of the boom.

  As described above, the assembly state recognition apparatus for an assembly structure according to the present invention is used for a structure in which a plurality of structural parts are assembled such as a crane boom, and any one of the structural parts such as a crane main body. In a device in which the host device mounted on the device recognizes the assembled state such as whether the assembly order is wrong by acquiring the attribute information of the client device mounted on the remaining structural parts such as the boom In addition to the communication path using the signal line, the host device and the client device are provided with load means for applying a load on the transmission side with respect to the power supply line, and the reception side transmits from the load fluctuation. Extraction means for extracting the signal component is provided, and another backup communication path using the power supply line is provided.

  Therefore, even if the signal path is interrupted due to disconnection of the signal line or disconnection of the connector, backup communication of the attribute information can be realized using the power line and the recognition function can be maintained. Thereby, the reliability can be improved.

  Furthermore, as described above, the crane of the present invention uses the assembly state recognition device for an assembly structure at least in the boom portion.

  Therefore, it is possible to easily confirm the connection order and connection leakage of many unit booms, and it is possible to confirm the construction machine used in a severe situation with high reliability.

It is a schematic block diagram of the crane using the assembly state recognition apparatus which concerns on one Embodiment of this invention. It is a figure for demonstrating the structure of the middle unit boom in the said crane. It is a block diagram which shows the electrical constitution of the assembly state recognition apparatus which concerns on one Embodiment of this invention. It is a figure for demonstrating the operation | movement of one Embodiment of this invention. It is a figure for demonstrating the operation | movement of one Embodiment of this invention. It is a figure for demonstrating the operation | movement of one Embodiment of this invention. It is a wave form diagram for demonstrating operation | movement of the assembly state recognition apparatus which concerns on other forms of implementation of this invention.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a crane 1 using an assembly state recognition device according to an embodiment of the present invention. The crane 1 includes a lower traveling body in which a main body 2 is movable by a crawler, and an upper revolving body mounted so as to be able to swivel thereon. 3 and the driver's cab, a counterweight 4 is mounted on the rear side, a hydraulic mechanism including a hoisting winch, a hoisting / lowering winch, a hydraulic source for driving a turning and traveling device, and driving sources thereof The engine that is.

  The boom 3 is assembled by sequentially adding a plurality of unit booms (structural parts) 3a, 3b, 3c, 3d, 3e, 3f at the construction site. The lower boom 3a is a unit boom that is positioned closest to the main body 2 of the boom 3, and the base end of the lower boom 3a is pivotally supported by the main body 2, so that the boom 3 as a whole can be swung vertically. . The upper boom 3f is a unit boom located on the most distal end side of the boom 3, and a sheave for supporting a wire for lifting the load is attached to the distal end of the upper boom 3f. The intermediate booms 3b to 3e are unit booms interposed between the lower boom 3a and the upper boom 3f.

  FIG. 2 is a view for explaining the structure of the intermediate booms 3b to 3e. The intermediate booms 3b to 3e are configured to have a box shape with four main members arranged at positions corresponding to the respective corners of a substantially quadrangular prism shape and a plurality of sub-materials connecting adjacent main members. Has been. The upper boom 3a and the lower boom 3f at both ends are formed in a quadrangular pyramid shape by narrowing the box shape. And the coupling pin part 7 is provided in the edge part of the front end side of each unit boom 3a-3e, On the other hand, the coupling hole part 8 is provided in the edge part of the base end side of each unit boom 3b-3f. It has been. The connecting pin portion 7 of each unit boom 3a to 3e is inserted into the connecting hole portion 8 of another unit boom 3b to 3f adjacent to the front end side with respect to the unit boom 3a to 3e, and is adjacent by a pin (not shown) or the like. The boom 3 is completed by fastening between the booms 3a to 3e; 3b to 3f.

  And these unit booms 3a-3f are sequentially connected from the main body 2 side in this order as described above, but the structures of the intermediate booms 3b-3e are similar. However, the load that can be withstood varies depending on the thickness and thickness of the steel material constituting the steel material, and the connection order is determined in advance. Further, in the case where there is a time lag in the transport of these disassembled intermediate booms 3b to 3e to the next site, there is a possibility that some parts may be forgotten to be assembled. Therefore, in this crane 1, the host device 5 is connected to the main body 2, and the attribute information predetermined by communicating with each unit boom 3 a to 3 f is communicated, and the client device 6 for recognizing the connection order is provided. , Respectively. Then, a plurality of client devices 6 are connected in cascade to the wiring 9 from the host device 5, whereby the assembly state recognition device of the present embodiment is configured. The wiring 9 can be separated from the main body 2 and the unit booms 3 a to 3 f by a connector 10.

  FIG. 3 is a block diagram showing an electrical configuration of the assembly state recognition apparatus of the present embodiment. In the assembly state recognition apparatus of this embodiment, first, the wiring 9 is constituted by a pair of power lines 9a and 9b of + and GND and a signal line 9c (GND is shared with the power line 9b), which are respectively They are connected to each other by the connectors 10a, 10b, and 10c, and are extended to the tip side of the boom 3.

  The host device 5 serving as the attribute information reading device transmits a request signal for the attribute information to the client device 6 via the power supply 50 that supplies power between the power supply lines 9a and 9b and the signal line 9c. The communication processing circuit 51 that receives the attribute information sent back from the client device 6 in response thereto, and causes the communication processing circuit 51 to transmit / receive the attribute information, and from the received attribute information, each unit And an arithmetic processing circuit 52 that determines whether or not the booms 3a to 3f are correctly connected.

  On the other hand, the client device 6 which is the attribute information recording device receives the attribute information request signal from the host device 5 via the signal line 9c, and responds to the host device 5 with the response. A communication processing circuit 61 for transmitting the attribute information to and a calculation processing circuit 62 for storing the attribute information in advance and causing the communication processing circuit 61 to transmit and receive the attribute information. The attribute information includes the weight, length, width, height, manufacturer name, model, date of manufacture, compression constant, bending constant, etc. for each of the unit booms 3a to 3f provided with the client device 6. Receiving this, the arithmetic processing circuit 52 of the host device 5 calculates the total length of the boom 3, the number of units booms 3a to 3f connected, the connection order, and the like. Then, the arithmetic processing circuit 52 issues a warning or prohibits the operation of the crane 1 for safety when any of the unit booms 3a to 3f is not correctly connected from the received attribute information. Also good. In addition, in order to perform communication between the host device 5 and an arbitrary client device 6 or between the client devices 6 individually, it is necessary to recognize each, but the communication protocol for recognition is the main point of the present invention. Since it is not, description is abbreviate | omitted.

  Each client device 6 is provided with a switch element 63 for power supply to the subsequent client device on the + power supply line 9a side. Opening and closing of the switch element 63 is controlled by the arithmetic processing circuit 62. The arithmetic processing circuit 62 opens the switch element 63 in the activated state, power is supplied between the power supply lines 9a and 9b, and the host When the device 5 is recognized on the device 5 side, the switch element 63 is closed to supply power to the succeeding client device, and the host device 5 is made to recognize the succeeding client device. In this way, when a plurality of client devices 6 are connected in cascade from the host device 5, the attribute information is sequentially acquired from the side closer to the host device 5 as to whether they are assembled in the intended assembly order, It can be recognized.

  In the assembly state recognition apparatus configured as described above, it should be noted that in the present embodiment, the host device 5 and the client device 6 include a pair of + and GND power supply lines 9a and 9b. As load means, a series circuit of load resistors 55 and 65 and switch elements 56 and 66 is interposed, and when the communication of the attribute information by the communication processing circuits 51 and 61 serving as communication means fails, the arithmetic processing circuits 52 and 62 are The attribute information is communicated using the power lines 9a and 9b. For this reason, the arithmetic processing circuits 52 and 62 as signal generating means open and close the switch elements 56 and 66 by digital output from the input / output port, and superimpose a pulse on the output voltage of the power supply 50. Further, the load fluctuation of the power supply 50 is received by the arithmetic processing circuits 52 and 62 as signal processing means through the high-pass filters 57 and 67 by digital input from the input / output ports.

  In order to realize stable operation with respect to load fluctuations of the power supply 50, the host device 5 and the client device 6 have a constant voltage circuit 58, which takes in a stable voltage from the power supply lines 9a, 9; 68 is provided. The power supply on the host device 5 side may be secured separately from the power supply 50 in which the load fluctuation occurs as described above. In that case, the constant voltage circuit 58 becomes unnecessary. The power source 50 may be an AC power source. In that case, the constant voltage circuits 58 and 68 are AC-DC converters.

  4 and 5 are diagrams for explaining the operation of the assembly state recognition apparatus configured as described above. As shown in FIG. 4A, when the client device 6 in all the unit booms 3a to 3f is normal and the wire 9 is not disconnected or disconnected, the connector 10 is shown in FIG. 4B. In addition, the voltage of the power supply 50 gradually decreases as V0 increases when the power supply switch element 63 is closed and the load increases. This voltage is V1. Using the voltage V1 as a power source and the voltage stabilized by the constant voltage circuits 58 and 68, the communication processing circuits 51 and 61 transmit and receive the attribute information and its request signal at the level S1 through the signal line 9c. .

  On the other hand, for example, as shown in FIG. 5 (a), when disconnection or disconnection of the connector 10c occurs between the main body 2 and the first stage unit boom 3a with respect to the signal line 9c, Since there is no response of attribute information to the request signal for a predetermined time or more, the arithmetic processing circuit 52 on the host device 5 side opens and closes the switch element 56 by digital output from the input / output port. As a result, as shown in FIG. 4B, a load fluctuation of level S2 corresponding to the load resistor 55 occurs between the power supply lines 9a and 9b from the voltage V1. When the arithmetic processing circuit 62 of the client device 6 of the lower boom 3a receives this from the high-pass filter 67 via the input / output port, the switch element 66 is similarly opened and closed by digital output from the input / output port, and attribute information is returned. Do. When the recognition of the lower boom 3a at the first stage is completed in this way, the switch element 63 of the lower boom 3a is closed and power is supplied to the intermediate boom 3b at the second stage. Similarly, the power lines 9a and 9b Recognition is done using.

  On the other hand, for example, as shown in FIG. 6 (a), when the disconnection or disconnection of the connector 10c occurs with respect to the signal line 9c after the first stage lower boom 3a, as shown in FIG. 6 (b), Communication using the signal line 9c and communication using the power supply lines 9a and 9b are used together. In such a case, once the client device on the front side, which has normally communicated the attribute information via the signal line 9c, once detects that communication using the power supply lines 9a, 9b is being performed on the rear side. Thereafter, communication using the power supply lines 9a and 9b may be performed.

  As described above, in the assembly state recognition apparatus of the assembly structure according to the present embodiment, the host device 5 mounted on any one of the structural components is used for the structure formed by assembling a plurality of structural components. In the device that recognizes the assembly state such as whether the assembly order is wrong by acquiring the attribute information of the client device 6 mounted on the component, between the host device 5 and the client device 6, When the communication processing circuits 51 and 61, which are connected to each other by a pair of power lines 9a and 9b and a signal line 9c of + and GND and each have communication via the signal line 9c, use the signal line 9c. In addition to the communication paths, another backup communication path using the power supply lines 9a and 9b is provided, so that the signal line 9c is disconnected or its connector 10c is connected. Be the signal path is blocked, etc. Les can power supply line 9a, using 9b realize backup communication of the attribute information, to maintain recognition function. Thereby, the reliability can be improved.

  Moreover, the large lattice boom crane connects many unit booms 3a to 3f to form the boom 3, and the assembly state recognition device described above is used to check the connection order and connection leakage of the unit booms 3a to 3f. By using this, it is possible to easily check the assembled state and to check the construction machine used in a harsh situation with high reliability. In the crane 1, the assembly state recognition device can be used for the counterweight 4 and the like for checking the stacking order. In addition, the assembly state recognition apparatus of the present embodiment can be applied to an assembly of complicated structural parts such as a link mechanism of a robot.

(Embodiment 2)
FIG. 7 is a waveform diagram for explaining the operation of the assembled state recognition device according to another embodiment of the present invention. This waveform diagram corresponds to the waveform diagram shown in FIG. In the above-described embodiment, each client device 6 is provided with the switch element 63 for feeding power to the subsequent stage, and the host device 5 polls the multi-stage client devices 6 sequentially from the previous stage side for recognition. It is possible to go. On the other hand, when the switch element 63 is not provided in each client device 6, when the power supply 50 is turned on and the arithmetic processing circuit 52 transmits a request for attribute information via the communication processing circuit 51, each client device 6. These arithmetic processing circuits 62 respond all at once. At that time, in the case of communication using the signal line 9c, attribute information collision can be avoided by the communication protocol. However, in the case of communication using the power supply lines 9a and 9b, since there is no such collision avoidance protocol, a collision occurs.

  Therefore, it should be noted that in the present embodiment, the load resistance 65 in each client device 6 is set to a resistance value different from each other, preferably a resistance value having a prime number relationship with each other. As a result, the level of the voltage drop of the + side power supply line becomes a different level, for example, as indicated by reference numerals S21 and S22, and each signal component ( Attribute information).

  Then, by setting the load resistor 65 to a different resistance value as described above, the arithmetic processing circuit 52 of the host device 5 sets the voltage drop level of the + side power supply line 9a, that is, the resistance value. By reading from the analog / digital conversion port and comparing with a predetermined set value, it is possible to detect at which client device communication via the signal line 9c is impossible.

  Furthermore, even if the load resistor 65 has a different resistance value as described above, depending on the setting of the resistance value, when a plurality of client devices perform backup communication using a power line at the same time, There is a possibility that the voltage drop level may be the same when backup communication is performed, but by setting the resistance value to a value that is a prime relationship with each other, such a case can be avoided. It can be lost. Therefore, even if there are a plurality of client devices performing backup communication using the power supply lines 9a and 9b, each can be accurately identified.

  That is, for example, when the load amount (resistance value) of each client device 6 is 1 for the client 1, 2 for the client 2, and the power signal level V 1 at no load is 100, only the client 1 is communicating. If the power signal level is 99 (= 100-1) and only the client 2 is communicating, the power signal level is 98 (= 100-2) and the clients 1 and 2 are communicating simultaneously. The power supply signal level is 97 (= 100-1-2). Therefore, by observing the signal level at that time, it is possible to detect that one or both of the clients 1 and 2 are communicating. However, when there is a client 3 with a load amount of 3 and the client performs communication, the power signal level becomes 97, so that it cannot be distinguished from the case where the clients 1 and 2 are communicating simultaneously. Therefore, the signals can be separated by making the load amount of each client relatively prime. For example, if the client 1 is 1, the client 2 is 2, and the client 3 is 4, the power signal level when only one client communicates is 99 (= 100-1), 98 (= 100-2) , 96 (= 100-4), when two of the three communicate simultaneously, the power signal level is 97 (= 100-1-2), 95 (= 100-1-4), 94 ( = 100-2-4), and the power signal level when all three clients communicate at the same time is 93 (= 100-1-2-4), which is understood to be separable in all cases.

  Furthermore, such a resistance value setting may be performed for each group of a plurality of client devices 6. With this configuration, even when there are a large number of client devices, the types of resistance values can be reduced.

  However, if the number of clients that communicate simultaneously is large and even one of the duplicate signals or all of them cannot be received even with the method described above, the arithmetic processing circuit 52 of the host device 5 does not return a response (ACK). Therefore, in that case, the arithmetic processing circuit 62 of each client device 6 may return the response of the attribute information after a specific waiting time, or the load fluctuations of the power supply lines 9a and 9b may occur for a predetermined time. A response of attribute information may be returned when the observation is not performed over a period of time. Thus, when a plurality of client devices 6 respond simultaneously, signal separation may be performed by level division, time division, or a combination thereof.

  In the above-described embodiment, the digital communication by opening and closing the switch elements 56 and 66 has been described. However, analog communication may be used. The power supply 50 may be a plurality of power supplies.

  Here, Japanese Patent Application Laid-Open No. 2007-217110 attempts to solve the complexity of wiring by sequentially connecting a plurality of client devices. Further, in this prior art, an attempt is made to further omit wiring by using a power supply line instead of a signal line for reading attribute information. However, the present invention is different because the purpose of the present invention is to perform highly reliable communication, and the communication of the power supply line is used for backup in the event of a failure in the signal line.

  In the present embodiment, each client device 6 may be connected to the host device 5 in parallel as described in Patent Document 1 described above, and cascade connection and parallel connection may be used in combination.

DESCRIPTION OF SYMBOLS 1 Crane 2 Main body 3 Boom 3a, 3b, 3c, 3d, 3e, 3f Unit boom 4 Counterweight 5 Host apparatus 50 Power supply 51, 61 Communication processing circuit 52, 62 Operation processing circuit 55, 65 Load resistance 56, 66 Switch element 57 , 67 High-pass filter 58, 68 Constant voltage circuit 6 Client device 63 Switch element 9 Wiring 9a, 9b Power supply line 9c Signal line 10; 10a, 10b, 10c Connector

Claims (7)

In a structure composed of a plurality of structural parts, the host device mounted on any one of the structural parts recognizes the assembled state by acquiring the attribute information of the client device mounted on the remaining structural parts. In the device to do
The host device and the client device are connected to each other by a pair of power lines and signal lines, and communication means included in each communicates via the signal lines,
On the transmitting side of the host device and the client device, a signal to be transmitted is generated, and signal generating means for causing the communication means to transmit via the signal line, and the transmission generated by the signal generating means Load means for applying a load to the power line in response to a signal to be
On the receiving side of the host device and the client device, a signal processing means for decoding a signal received by the communication means via the signal line, and a signal transmitted from a load fluctuation of the power supply line An assembly state recognition apparatus for an assembly structure, comprising: extraction means for extracting a component and applying the extracted component to the signal processing means.   2. The assembly state recognition apparatus for an assembly structure according to claim 1, wherein the signal generating means drives the load means to communicate the attribute information when communication failure occurs by the communication means.   The load means comprises a series circuit of a load resistor and a switch element interposed between a pair of power supply lines of + or-and GND, realizes the load fluctuation by opening and closing the switch element, and the client 3. The assembly state recognition apparatus for an assembly structure according to claim 1, wherein load resistances in the apparatus are set to different resistance values.   4. The assembly state recognition apparatus for an assembly structure according to claim 3, wherein the load resistance is set to a resistance value having a prime number relationship with each other.   5. The assembly state recognition apparatus for an assembly structure according to claim 3, wherein the plurality of client devices are grouped, and the resistance value is set for each group.   The client device includes a switch element for power supply to a subsequent client device on the + or − power supply line side, and when the host device recognizes its own device, the switch device is closed and the switch device is closed. The assembly state recognition apparatus for an assembly structure according to any one of claims 1 to 5, wherein power is supplied to the subsequent-stage client device to cause recognition of the subsequent-stage client device.   The crane which uses the assembly state recognition apparatus of the assembly structure of any one of the said Claims 1-6 for a boom part at least.

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