Construction machinery

Abstract

The present invention provides a construction machine in which the data communication line between the upper rotating body and the attachment, which is composed of multiple elements, forms a single, unbranched main line. [Solution] In the construction machine, the termination box 17 has a termination resistor 72 and one base-side connection terminal 31, and has a first trunk line and a second trunk line from the base-side connection terminal to the termination resistor, the jib 13a, which is a communication trunk line containing element, has a base-side connection terminal 31 and a corresponding end-side connection terminal 32, and has a first trunk line 100 and a second trunk line 101 from the base-side connection terminal to the end-side connection terminal, the upper slewing body 12 has a termination resistor 21 and an end-side connection terminal 22, and also has a first trunk line and a second trunk line from the termination resistor to the end-side connection terminal, the communication trunk line containing element, the upper slewing body and the termination box are connected so that the first trunk lines and the second trunk lines are electrically connected to each other, and the connected first trunk line and second trunk line each constitute a single trunk line without branching as a whole.

Description

Technical Field

[0001] The present invention relates to construction machinery.

Background Art

[0002] In recent years' construction machinery, various electronic devices and control devices have come to be installed. These electronic devices and control devices perform information communication, for example, using a data communication line from a central computer.

[0003] Even for the same construction machinery, there is a degree of freedom in configuration, such as the presence or absence of a counterweight and changes in the boom configuration. Therefore, it is necessary to change the configuration of the data communication line (bus) according to the selected configuration. Particularly for a data communication line that requires termination resistors at both ends of the bus, such as CAN communication, it is necessary to insert the termination resistors at appropriate positions according to the selection of the above configuration.

[0004] As a method of configuring a data communication line that requires termination resistors, a method has been proposed in which the upper swing body of a construction machine is divided into several units, termination resistors at both ends of the bus are mounted on each unit, and an appropriate data communication line is configured by switching the use / non-use of the termination resistors of each unit according to the selected configuration (see Japanese Patent Application Laid-Open No. 2014-208525).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the conventional construction machinery described above, the location of the termination resistor is limited to the upper rotating body, making it necessary to route data communication lines for electronic devices and other equipment into the upper rotating body, and creating such a route is not easy. Furthermore, the user of the construction machinery has to decide which location of the termination resistor to use depending on the configuration being used, which is not only a cumbersome task for the user, but also a risk of situations where a termination resistor remains in an unexpected location or where a necessary termination resistor is missing if the choice of whether or not to use a termination resistor is incorrect.

[0007] This disclosure is made based on the circumstances described above and aims to provide construction machinery that can easily configure data communication lines in accordance with the selected configuration. [Means for solving the problem]

[0008] A construction machine according to one aspect of the present disclosure comprises an upper slewing body and an attachment comprising one or more elements, wherein some or all of the elements and the upper slewing body are connected by a data communication line, and comprises a termination box having a termination resistor terminating one end of the data communication line and one base-side connection terminal, and having a first trunk line from the base-side connection terminal to the termination resistor, and a second trunk line from the termination resistor to the base-side connection terminal, wherein the communication trunk line-containing element, which is an element connected by the data communication line, has a base-side connection terminal and a corresponding terminal-side connection terminal, and has a first trunk line from the base-side connection terminal to the terminal-side connection terminal, and a second trunk line from the terminal-side connection terminal to the base-side connection terminal, and the upper slewing body is connected by the data The communication line has a termination resistor and one terminal end for terminating the other end of the communication line, and includes a first trunk line from the termination resistor to the terminal end, and a second trunk line from the terminal end to the termination resistor, wherein some or all of the communication trunk line containing elements are connected such that the base terminals of the elements are electrically connected to the terminal end terminals of the upper rotating body or other communication trunk line containing elements, and the terminal end terminals of the elements are electrically connected to the base terminal terminals of the termination box or other communication trunk line containing elements, and the first trunk lines are electrically connected to the first trunk lines and the second trunk lines are electrically connected to the first trunk lines and the second trunk lines as a whole, and the connected first trunk lines constitute one trunk line without branching as a whole, and the connected second trunk lines constitute one trunk line without branching as a whole. [Effects of the Invention]

[0009] The construction machinery described herein allows for easy configuration of data communication lines to correspond to the selected configuration. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic side view showing the configuration of a construction machine according to one embodiment of the present disclosure. [Figure 2]Figure 2 is an explanatory diagram illustrating the configuration of the data communication lines in the upper rotating body, communication trunk line containing element, and termination box of the construction machine shown in Figure 1. [Figure 3] Figure 3 is an explanatory diagram illustrating the configuration of a data communication line when the upper rotating body, communication trunk line containing element, and termination box of the construction machine shown in Figure 5 are connected. [Figure 4] Figure 4 is an explanatory diagram illustrating the configuration of the data communication line when the jib of the construction machine shown in Figure 1 is extended. [Figure 5] Figure 5 is a schematic side view showing the configuration of a construction machine according to a different embodiment than that shown in Figure 1. [Figure 6] Figure 6 is an explanatory diagram illustrating the configuration of a data communication line when the upper rotating body, communication trunk line containing element, and termination box of the construction machine shown in Figure 5 are connected. [Modes for carrying out the invention]

[0011] [Description of Embodiments of the Invention] (1) A construction machine according to one aspect of the present disclosure comprises an upper rotating body and an attachment comprising one or more elements, wherein some or all of the elements and the upper rotating body are connected by a data communication line, and comprises a termination box having a termination resistor terminating one end of the data communication line and one base-side connection terminal, and having a first trunk line from the base-side connection terminal to the termination resistor, and a second trunk line from the termination resistor to the base-side connection terminal, wherein the communication trunk line-containing element, which is an element connected by the data communication line, has a base-side connection terminal and a corresponding terminal-side connection terminal, and has a first trunk line from the base-side connection terminal to the terminal-side connection terminal, and a second trunk line from the terminal-side connection terminal to the base-side connection terminal, and the upper rotating body is the data The communication trunk line includes a termination resistor and one terminal end for terminating the other end of the communication line, and a first trunk line extending from the termination resistor to the terminal end, and a second trunk line extending from the terminal end to the termination resistor, wherein some or all of the communication trunk line containing elements are connected such that the base terminals of the elements are electrically connected to the terminal end terminals of the upper rotating body or other communication trunk line containing elements, and the terminal end terminals of the elements are also connected such that the first trunk lines are electrically connected to each other and the second trunk lines are electrically connected to each other and the first trunk lines are electrically connected to each other and the second trunk lines are electrically connected to each other and the first trunk lines are electrically connected to each other and the second trunk lines are electrically connected to each other. The connected first trunk lines constitute a single trunk line without branching as a whole, and the connected second trunk lines constitute a single trunk line without branching as a whole.

[0012] In this construction machine, the other termination resistor is fixed inside the upper rotating body, and the upper rotating body has a terminal end that connects to this termination resistor. If no communication trunk line elements are used, connecting a termination box to the terminal end of the upper rotating body terminates the connection between the first trunk line and the second trunk line with a termination resistor, thus creating a data communication line with termination resistors at both ends. If communication trunk line elements are used, one of the communication trunk line elements is connected to the terminal end of the upper rotating body, and the base terminal of this communication trunk line element is connected to the terminal end of the upper rotating body, so that the first trunk line and the second trunk line extend from the base terminal of the communication trunk line element to the terminal end. Similarly, connecting a termination box to the terminal end of the communication trunk line element terminates the connection between the first trunk line and the second trunk line with a termination resistor, thus creating a data communication line with termination resistors at both ends. On the other hand, when the next communication trunk element is connected to the terminal end connection terminal of the above-mentioned communication trunk element, the first trunk and the second trunk extend to the terminal end connection terminal via the base end connection terminal of the next communication trunk element. By repeating this process, the first trunk and the second trunk can be extended until a termination box is connected, making it easy to configure a data communication line.

[0013] (2) In (1) above, the base-side connection terminal and the terminal-side connection terminal are arranged on the surface to which the other communication trunk line-containing element, the upper swivel body, or the termination box are connected, and the corresponding base-side connection terminal and terminal-side connection terminal are electrically connected by connecting the communication trunk line-containing element to the other communication trunk line-containing element, the upper swivel body, or the termination box. By configuring the communication trunk line-containing element to be electrically connected to the corresponding base-side connection terminal and terminal-side connection terminal by connecting it to the other communication trunk line-containing element, the upper swivel body, or the termination box in this way, additional work such as wiring between the corresponding terminals is eliminated, and thus a data communication line can be configured efficiently.

[0014] (3) In the above (1) or (2), the data communication line may be a CAN communication line. The construction machine is suitably compatible with the CAN communication line.

[0015] (4) In any of the above (1) to (3), the communication trunk-containing element may be a jib. Since the jibs are linearly connected and the number of stages changes according to the application, the present disclosure can be used easily and effectively.

[0016] (5) In any of the above (1) to (4), part or all of the communication trunk-containing element may have two or more sets of base-end side connection terminals and corresponding end-side connection terminals. With this configuration, the construction machine can also configure a data communication line for a configuration in which a plurality of communication trunk-containing elements branch from one communication trunk-containing element.

[0017] [Details of Embodiments of the Present Invention] Hereinafter, a construction machine according to an embodiment of the present invention will be described with appropriate reference to the drawings.

[0018] [First Embodiment] The construction machine 1 shown in FIG. 1 includes a lower traveling body 11, an upper revolving body 12 mounted on the lower traveling body 11 so as to be horizontally rotatable, an attachment 13 attached to the upper revolving body 12 so as to be able to undulate (swing so as to fall forward and stand up backward), a hook 14, a wire rope 15 hanging the hook 14 from the tip of the attachment 13, and a winch 16 for winding up the wire rope 15.

[0019] [Configuration of Construction Machine] The lower traveling body 11 has a crawler frame 11a as a traveling device and crawlers 11b disposed on the crawler frame 11a. The crawler frame 11a and the crawlers 11b are provided on both sides in the width direction of the lower traveling body 11, respectively. That is, the lower traveling body 11 has a pair of crawler frames 11a and crawlers 11b.

[0020] The upper rotating body 12 includes an operator's cabin 12a adjacent to the attachment point 13, a rotating lever 12b, and a luffing winch (not shown) for luffing the attachment 13.

[0021] Of these, the operator's cabin 12a is where the operator sits and operates the construction machine 1.

[0022] The slewing lever 12b controls the rotation of the upper slewing body 12. The slewing lever 12b is located inside the operator's cabin 12a and can be operated by the operator. The slewing lever 12b shown in Figure 1 is a stick type, and for example, when pulled towards the operator, the upper slewing body 12 rotates, and the rotation speed changes according to the amount it is pulled. Note that the slewing lever 12b shown in Figure 1 is an example, and the slewing lever 12b is not limited to this configuration.

[0023] The attachment 13 consists of one or more elements. In the construction machine 1, the attachment 13 consists of one jib 13a. The construction machine 1 can lift loads via this attachment 13. In the construction machine 1 shown in Figure 1, the attachment 13 is not extendable, but the attachment 13 may be extendable. The attachment 13 has a sheave 13x at its tip that guides the wire rope 15. The attachment 13 also has a jib angle gauge 30.

[0024] The hook 14 is fixed to the lower end of the wire rope 15 and is used for lifting or lowering loads.

[0025] The wire rope 15 is wound around the winch 16 via the sheave 13x at the end of the attachment 13.

[0026] The winch 16 is installed on the upper slewing body 12. The winch 16 can move the hook 14 upward by winding up the wire rope 15, and move the hook 14 downward by unwinding the wire rope 15. The winch 16 may also be installed on the back side of the attachment 13 (the side that is on top when the attachment 13 is tilted).

[0027] <Data communication line configuration> In the construction machine 1, the jib 13a and the upper slewing body 12, which are elements constituting the attachment 13, are connected by a data communication line. In other words, all of the elements and the upper slewing body 12 of the construction machine 1 are connected by a data communication line.

[0028] One example of the data communication line mentioned above is a CAN communication line. The construction machine 1 is suitably compatible with a CAN communication line. The following explanation will use the case of a CAN communication line as an example, but this does not mean that the data communication line is limited to a CAN communication line. For example, the data communication line may be another type of communication line that requires termination resistors at both ends of the trunk line.

[0029] (Terminal box) As shown in Figure 2, the construction machine 1 is equipped with one termination box 17. The termination box 17 has one base-side connection terminal 71 and a termination resistor 72 that terminates one end of the data communication line, and also has a first trunk line 73 from the base-side connection terminal 71 to the termination resistor 72, and a second trunk line 74 from the termination resistor 72 to the base-side connection terminal 71.

[0030] (Communication trunk line component) The jib 13a is an element connected by the above-mentioned data communication line (hereinafter also referred to as the "communication trunk line containing element"). The jib 13a has a base-side connection terminal 31 and a corresponding terminal-side connection terminal 32, as well as a first trunk line 33 extending from the base-side connection terminal 31 to the terminal-side connection terminal 32, and a second trunk line 34 extending from the terminal-side connection terminal 32 to the base-side connection terminal 31.

[0031] (Upper rotating body) The upper rotating body 12 has a termination resistor 21 and one terminal connector 22 that terminates the other end of the data communication line, and also has a first trunk line 23 from the termination resistor 21 to the terminal connector 22, and a second trunk line 24 from the terminal connector 22 to the termination resistor 21.

[0032] (Construction of data communication lines) The jib 13a, which is the entirety of the above-mentioned communication trunk line-containing elements, has its base end connection terminal 31 connected to the end end connection terminal 22 of the upper swivel body 12 so that the first trunk lines 23, 33 and the second trunk lines 24, 34 are electrically connected to each other, and its end end connection terminal 32 connected to the base end connection terminal 71 of the termination box 17 so that the first trunk lines 33, 73 and the second trunk lines 34, 74 are electrically connected to each other. As shown in Figure 3, the connected first trunk lines 23, 33, and 73 together constitute one trunk line 100 without branching, and the connected second trunk lines 24, 34, and 74 together constitute one trunk line 101 without branching.

[0033] Here, the jib angle meter 30 installed on the jib 13a will exchange data signals with this data communication line. In this case, as shown in Figure 2, the jib angle meter 30 is connected to the first trunk line 23 and the second trunk line 24 by a branch line 35 to exchange data signals. At this time, by configuring the branch line 35 to be less than a predetermined length, it is possible to prevent the branch line 35 from electrically becoming part of the trunk lines 100 and 101. In a CAN communication line, it is necessary for trunk lines 100 and 101 to be constructed as a single trunk line without branching as a whole, so by devising the position of the jib angle meter 30 and the routing of the first trunk line 23 and the second trunk line 24, the branch line 35 is designed to be less than a predetermined length.

[0034] The base-side connection terminals 31, 71 and the terminal-side connection terminals 22, 32 are arranged on the surface to which the jib 13a, upper swivel body 12, or termination box 17, which are other communication trunk line elements to which the jib 13a is connected, are connected. By connecting the jib 13a to the upper swivel body 12 and the termination box 17, the corresponding base-side connection terminals and terminal-side connection terminals (between the base-side connection terminal 31 of the jib 13a and the terminal-side connection terminal 22 of the upper swivel body 12, and between the base-side connection terminal 71 of the termination box 17 and the terminal-side connection terminal 22 of the jib 13a) are electrically connected. By configuring the jib 13a to be electrically connected to the upper swivel body 12 and the termination box 17 in this way, the additional work of wiring between the corresponding terminals is eliminated, thus enabling the efficient construction of a data communication line.

[0035] <Regarding scalability> In the construction machine 1, the communication trunk line containing element is the jib 13a. Another jib 13b can be connected to and extended from the jib 13a, for example, as shown in Figure 4.

[0036] Another jib 13b constitutes a data communication line as another communication trunk line-containing element. The data communication line of the other jib 13b is configured in the same way as the data communication line of the original jib 13a. In this case, the construction machine 1 can be configured by removing the termination box 17 from the construction machine 1 before extension, connecting the other jib 13b, and attaching the removed intermediate box 17 to the terminal connection terminal 32 of the other jib 13b. With this configuration, for all of the above communication trunk line-containing elements (the two jibs 13a and 13b), the base terminal connection terminal 31 of the original jib 13a is connected to the terminal connection terminal 22 of the upper slewing body 12. The terminal connection terminal 32 of the original jib 13a is connected to the base terminal connection terminal 31 of the other jib 13b. The terminal connection terminal 32 of the other jib 13b is connected to the base terminal connection terminal 71 of the termination box 17. In this way, the connected first trunk lines 23, 33, and 73 together constitute a single trunk line 100 without branches, and the connected second trunk lines 24, 34, and 74 together constitute a single trunk line 101 without branches.

[0037] The same configuration and procedure can be used to further extend the jib of construction machine 1, which is composed of two jibs 13a and 13b.

[0038] Thus, the number of stages in the jib 13a will vary depending on the application, but when the jib 13a is extended, the extended jib 13b is connected in a straight line, so this disclosure can be used easily and effectively.

[0039] <Advantages> In the construction machine 1, the other termination resistor 21 is fixed inside the upper slewing body 12, and the upper slewing body 12 has a terminal end connection terminal 22 connected to this termination resistor 21. If no communication trunk line-containing elements are used, connecting a termination box 17 to the terminal end connection terminal 22 of the upper slewing body 12 terminates the connection between the two trunk lines 100 and 101 with a termination resistor 72, thus creating a data communication line with termination resistors 21 and 72 at both ends. If communication trunk line-containing elements are used, a jib 13a is connected to the terminal end connection terminal 22 of the upper slewing body 12 as one of the communication trunk line-containing elements, and the base end connection terminal 31 of this communication trunk line-containing element is connected to the terminal end connection terminal 22 of the upper slewing body 12, so that the trunk lines 100 and 101 extend to the terminal end connection terminal 32 via the base end connection terminal 31 of the communication trunk line-containing element. Similarly, when a termination box 17 is connected to the terminal end connection terminal 32 of the above-mentioned communication trunk line element, the two trunk lines 100 and 101 are terminated by a termination resistor 72, thereby forming a data communication line with termination resistors 21 and 72 at both ends. On the other hand, when another jib 13b is connected to the terminal end connection terminal 32 of the above-mentioned communication trunk line element as the next communication trunk line element, the trunk lines 100 and 101 extend to the terminal end connection terminal 32 via the base end connection terminal 31 of the other jib 13b. By repeating this process, the two trunk lines 100 and 101 can be extended until a termination box 17 is connected, making it easy to form a data communication line.

[0040] [Second Embodiment] <Construction Machinery Configuration> The construction machine 2 shown in Figure 5 comprises a lower traveling body 11, an upper slewing body 12 mounted on the lower traveling body 11 so as to be able to rotate horizontally, an attachment 18 attached to the upper slewing body 12 so as to be able to luff (tilt forward and stand upright backward), a hook 14, a wire rope 15 hanging from the tip of the attachment 13 to the hook 14, and a winch 16 for winding up the wire rope 15.

[0041] Since the construction machine 2 has the same configuration as the construction machine 1 of the first embodiment, except for the attachment 18, the same number is used and the explanation is omitted.

[0042] As shown in Figure 5, the attachment 18 of the construction machine 2 has a boom 18a, a jib 18b, a front strut 18c, and a rear strut 18d. The construction machine 2 is a tower-type construction machine with the jib 18b attached to the tip of the boom 18a, and the attachment 18 is composed of four elements.

[0043] In the construction machine 2, the boom 18a has a boom angle meter 80, the jib 18b has a jib angle meter 81, and the rear strut 18d has a jib load meter 82. Therefore, in the construction machine 2, the boom angle meter 80, the jib angle meter 81, and the jib load meter 82 require data communication.

[0044] <Data communication line configuration> In the construction machine 2, of the four elements, the three elements that contain the communication trunk line are the boom 18a, the jib 18b, and the rear strut 18d. In other words, in the construction machine 2, parts of multiple elements and the upper slewing body 12 are connected by data communication lines.

[0045] When configuring the data communication line for the construction machine 2, as shown in Figure 6, it is preferable that the boom 18a, which is part of the communication trunk line-containing element, has two sets of base-side connection terminals 31a, 31b and corresponding end-side connection terminals 32a, 32b. Specifically, for the first base-side connection terminal 31a and its corresponding first end-side connection terminal 32a, it has a first trunk line 33a extending from the base-side connection terminal 31a to the end-side connection terminal 32a and a second trunk line 34a extending from the end-side connection terminal 32a to the base-side connection terminal 31a. For the second base-side connection terminal 31b and its corresponding second end-side connection terminal 32b, it has a first trunk line 33b extending from the base-side connection terminal 31b to the end-side connection terminal 32b and a second trunk line 34b extending from the end-side connection terminal 32b to the base-side connection terminal 31b.

[0046] Furthermore, the data communication lines for the jib 18b and the rear strut 18d can have the same configuration as the data communication line for the communication trunk line-containing element (jib 13a) of the construction machine 1 in the first embodiment, so the same reference numerals are used and detailed explanation is omitted.

[0047] By configuring the data communication line of the boom 18a in this manner, similar to the configuration of the data communication line in the construction machine 1 of the first embodiment, each communication trunk line containing element, the upper slewing body 12, and the terminal box 17 are connected so that the first trunk lines are electrically connected to each other and the second trunk lines are electrically connected to each other. The connected first trunk lines 33, 33a, 33b, 23, and 73 together constitute a single trunk line 100 without branching, and the connected second trunk lines 34, 34a, 34b, 24, and 74 together constitute a single trunk line 101 without branching.

[0048] <Advantages> With this configuration, the construction machine 2 can also configure a data communication line in a configuration where one communication trunk line-containing element branches into multiple communication trunk line-containing elements.

[0049] [Other embodiments] The above embodiments do not limit the configuration of the present invention. Accordingly, the above embodiments allow for the omission, substitution, or addition of components of each part of the above embodiments based on the description herein and common technical knowledge, and all such omissions, substitutions, or additions should be interpreted as falling within the scope of the present invention.

[0050] In the above embodiment, a construction machine having a crawler unit as its lower traveling body was described as an example, but the lower traveling body may also have wheels. Thus, the details of the construction machine's configuration are not limited.

[0051] In the above embodiment, we described a case where all communication trunk line elements are incorporated into the data communication line. However, it is not always the case that all communication trunk line elements are incorporated into the data communication line. For example, depending on the selected configuration, there may be communication trunk line elements that do not need to perform data communication. In such cases, these communication trunk line elements do not need to be incorporated into the data communication line. In this case, the data communication line may consist of some of the communication trunk line elements, excluding those that do not need to be incorporated into the data communication line. In other words, a portion of the above-mentioned communication trunk line containing element is connected such that its base end connection terminal is connected to the end end connection terminal of the upper rotating body or to the end end connection terminal of another above-mentioned communication trunk line containing element, so that the first trunk lines and the second trunk lines are electrically connected to each other. Its end end connection terminal is also connected such that the first trunk lines and the second trunk lines are electrically connected to the base end connection terminal of the termination box or to the base end connection terminal of another above-mentioned communication trunk line containing element, so that the connected first trunk lines as a whole constitute a single trunk line without branching, and the connected second trunk lines as a whole constitute a single trunk line without branching.

[0052] In the second embodiment described above, a case was described in which the communication trunk element has two sets of base-side connection terminals and corresponding terminal-side connection terminals. However, depending on the selected configuration, the communication trunk element may have three or more sets of base-side connection terminals and corresponding terminal-side connection terminals.

[0053] Furthermore, the configuration of the construction machinery is not limited to the embodiments described above, and this disclosure can be used in other construction machinery that has a data communication line. [Industrial applicability]

[0054] As described above, the construction machinery of this disclosure allows for easy configuration of a data communication line in accordance with the selected configuration. [Explanation of symbols]

[0055] 1, 2 Construction machinery 11 Lower running body 11a Crawler Frame 11b Crawler 12 Upper rotating body 12a Pilot's cabin 12b Swivel lever 21 Termination resistors 22 End-side connection terminal 23. Main Line No. 1 24 Second Main Line 13 Attachments 13a, 13b jib 13x Sheave 30 Jib angle gauge 31, 31a, 31b Base-side connection terminals 32, 32a, 32b End-side connection terminals 33, 33a, 33b 1st main line 34, 34a, 34b 2nd main line 35 branch line 14 hooks 15 Wire rope 16 Winch 17 Termination Box 71 Base-side connection terminal 72 Termination resistors 73. Main Line No. 1 74 Second Main Line 18 Attachments 18a Boom 18b Jib 18c Front strut 18d Rear strut 80 Boom Angle Gauge 81 Jib angle meter 82 Jib load cell 100, 101 main line

Claims

1. A construction machine comprising an upper rotating body and an attachment consisting of one or more elements, wherein some or all of the elements and the upper rotating body are connected by a data communication line, The data communication line has a termination resistor that terminates one end of the above data communication line and a base-side connection terminal, and a termination box that has a first trunk line from the base-side connection terminal to the termination resistor and a second trunk line from the termination resistor to the base-side connection terminal. The communication trunk line element, which is an element connected in the above data communication line, has a base-side connection terminal and a corresponding terminal-side connection terminal, and has a first trunk line extending from the base-side connection terminal to the terminal-side connection terminal, and a second trunk line extending from the terminal-side connection terminal to the base-side connection terminal. The upper rotating body has a termination resistor and one terminal connector that terminates the other end of the data communication line, and has a first trunk line from the termination resistor to the terminal connector and a second trunk line from the terminal connector to the termination resistor. Some or all of the above communication trunk line containing elements are connected such that their base end connection terminals are connected to the end end connection terminals of the upper rotating body or to the end end connection terminals of other above communication trunk line containing elements, so that the first trunk lines are electrically connected to each other and the second trunk lines are electrically connected to each other. The terminal end connection is connected to the base end connection terminal of the termination box or to the base end connection terminal of the other communication trunk line containing element, so that the first trunk lines are electrically connected to each other and the second trunk lines are electrically connected to each other. The connected first trunk line, as a whole, constitutes a single trunk line without branches. A construction machine in which the connected second main line, as a whole, constitutes a single main line without branching.

2. The base-side connection terminal and the terminal-side connection terminal are respectively arranged on the surfaces to which the other communication trunk line-containing element, the upper rotating body, or the terminal box are connected. The construction machine according to claim 1, wherein the above-mentioned communication trunk element is connected to other communication trunk elements, the above-mentioned upper rotating body, or the above-mentioned terminal box, thereby electrically connecting the corresponding base-side connection terminal and terminal-side connection terminal.

3. The construction machine according to claim 1 or claim 2, wherein the above data communication line is a CAN communication line.

4. The construction machine according to claim 1 or claim 2, wherein the above-mentioned communication trunk line containing element is a jib.

5. The construction machine according to claim 1 or claim 2, wherein some or all of the above-mentioned communication trunk line-containing elements have two or more sets of base-end connection terminals and corresponding terminal-end connection terminals.

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