Chain Gate System

Abstract

To provide a chain gate system that can improve convenience during construction. [Solution] A chain gate system 100 includes a main machine 1, an accessory 2, and a chain 3. The main machine 1 includes a first motor 11, a first control unit 121, and a first communication unit 13. The accessory 2 includes a second motor 21, a second control unit 221, and a second communication unit 23. The chain 3 is connected between the main machine 1 and the accessory 2. The first motor 11 raises and lowers a first end of the chain 3 based on the control content of the first control unit 121. The second motor 21 raises and lowers a second end of the chain 3 based on the control content of the second control unit 221. The first communication unit 13 and the second communication unit 23 transmit and receive control signals Si1 related to the control of the first motor 11 and the second motor 21 to each other via wireless communication.

Description

[Technical Field]

[0001] The present disclosure relates to a chain gate system, and more particularly to a chain gate system that raises and lowers a chain. [Background technology]

[0002] The chain gate described in Patent Document 1 has a pair of gateposts arranged facing each other at a predetermined distance, and restricts the passage of vehicles by raising and lowering a chain or the like between the gateposts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-190208 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional chain gates require the installation of communication cables between gateposts during construction, which is inconvenient. Therefore, there is a need to improve the convenience of conventional chain gates during construction.

[0005] The present disclosure has been made in consideration of the above-mentioned reasons, and aims to provide a chain gate system that can improve convenience during installation. [Means for solving the problem]

[0006] A chain gate system according to one aspect of the present disclosure includes a main machine, an accessory, and a chain. The main machine has a first motor, a first control unit, and a first communication unit. The accessory has a second motor, a second control unit, and a second communication unit. The chain is connected between the main machine and the accessory. The first motor raises and lowers a first end of the chain based on the control content of the first control unit. The second motor raises and lowers a second end of the chain based on the control content of the second control unit. The first communication unit and the second communication unit Using radio waves Control signals relating to the control of the first motor and the second motor are transmitted and received to and from each other via wireless communication. The main engine further includes a first photoelectric sensor, and the auxiliary engine further includes a second photoelectric sensor. The first photoelectric sensor and the second photoelectric sensor transmit and receive the control signal to and from each other by performing bidirectional optical communication. [Effects of the Invention]

[0007] The present disclosure has the advantage of improving convenience during construction. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram showing a schematic configuration of a chain gate system according to this embodiment. [Figure 2] FIG. 2 is a sequence diagram for explaining the operation of the chain gate system. DETAILED DESCRIPTION OF THE INVENTION

[0009] The embodiments and modifications described below are merely examples of the present disclosure. The present disclosure is not limited to the embodiments and modifications, and various modifications other than these embodiments and modifications are possible depending on the design, etc., as long as they do not deviate from the technical concept of the present disclosure. The drawings described in the following embodiments and modifications are schematic drawings, and the ratios of the sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensional ratios.

[0010] (Embodiment) (1) Overview An overview of a chain gate system 100 according to this embodiment will be described below with reference to FIG.

[0011] The chain gate system 100 according to this embodiment includes a main machine 1, an accessory 2, and a chain 3. The main machine 1 includes a first motor 11, a first motor control unit 121, and a first communication unit 13. The accessory 2 includes a second motor 21, a second motor control unit 221, and a second communication unit 23. The chain 3 is connected between the main machine 1 and the accessory 2. The first motor 11 raises and lowers a first end of the chain 3 based on the control content of the first motor control unit 121. The second motor 21 raises and lowers a second end of the chain 3 based on the control content of the second motor control unit 221. The first communication unit 13 and the second communication unit 23 transmit and receive control signals related to the control of the first motor 11 and the second motor 21 to each other via wireless communication. The first motor control unit 121 corresponds to the first control unit in the present disclosure. Similarly, the second motor control unit 221 corresponds to the second control unit in the present disclosure.

[0012] The chain gate system of the comparative example includes a signal cable for the first communication unit and the second communication unit to transmit and receive control signals related to the control of the first motor and the second motor. Therefore, in the chain gate system of the comparative example, the signal cable needs to be laid between the main machine and the auxiliary machine during construction. In other words, the chain gate system of the comparative example is less convenient during construction, and there is a need to improve convenience.

[0013] In the chain gate system 100 of this embodiment, during construction, there is no need to lay a signal cable between the main machine 1 and the auxiliary machine 2 for transmitting and receiving control signals related to the control of the first motor 11 and the second motor 21. Therefore, the chain gate system 100 of this embodiment has the advantage of being able to improve convenience during construction. Note that "during construction" in this disclosure includes, for example, when constructing a new system or when replacing a chain gate system made by another company.

[0014] (2) Detailed configuration (2-1) Overall The detailed configuration of the chain gate system 100 of this embodiment will be described below with reference to FIG.

[0015] The chain gate system 100 is installed, for example, at the entrance / exit of a parking lot of a facility. As shown in FIG. 1, the chain gate system 100 includes a main machine 1, an auxiliary machine 2, a chain 3, a first power cable C1, and a second power cable C2. The main machine 1 and the auxiliary machine 2 are installed at a predetermined distance apart, allowing vehicles to pass through. The chain 3 is connected between the main machine 1 and the auxiliary machine 2. More specifically, the chain 3 is stretched between the main machine 1 and the auxiliary machine 2. Note that the term "vehicle" used in this disclosure includes automobiles and motorcycles.

[0016] The chain gate system 100 raises and lowers the chain 3 in response to a request from an external device (not shown) to raise or lower the chain 3. As a result, the chain gate system 100 switches between an open state in which vehicles can pass and a closed state in which vehicles cannot pass. Note that "raising and lowering the chain 3" in this disclosure means moving the chain 3 in the up and down direction. The external device is, for example, a dedicated remote controller carried by a user of a vehicle that intends to pass between the main engine 1 and the auxiliary engine 2.

[0017] The first power cable C1 electrically connects the external power source PW1 and the main machine 1, and supplies power from the external power source PW1 to the main machine 1. The second power cable C2 electrically connects the main machine 1 and the auxiliary machine 2, and supplies power received by the main machine 1 from the external power source PW1 to the auxiliary machine 2.

[0018] (2-2) Main engine As shown in Figure 1, the main engine 1 has a first motor 11, a first processing unit 12, a first communication unit 13, a first photoelectric sensor 14, a memory unit 15, a reception unit 16, a rotation angle detection unit 17, a load detection unit 18, and a display unit 19.

[0019] (First motor) The first motor 11 raises and lowers the first end of the chain 3 based on the control content of a first motor control unit 121 (described later) of the first processing unit 12. The first motor 11 is, for example, a brushless motor. The first end of the chain 3 is connected (coupled) to the output shaft of the first motor 11 so that the first end of the chain 3 is lowered (moved downward) by rotation of the first motor 11 in a first direction and the first end of the chain 3 is raised (moved upward) by rotation of the first motor 11 in a second direction.

[0020] When lowering the first end of the chain 3, the first motor 11 lowers the first end of the chain 3 to a preset lowering stop position based on the control content of the first motor control unit 121. When raising the first end of the chain 3, the first motor 11 raises the first end of the chain 3 to a preset raising stop position based on the control content of the first motor control unit 121.

[0021] The first motor 11 has a first brake unit 111 that holds a first end of the ascending or descending chain 3. Furthermore, the first brake unit 111 holds the first end of the ascending or descending chain 3 at a descending stop position or an ascending stop position based on the control content of the first motor control unit 121.

[0022] Based on the control content of the abnormality processing unit 124, the first brake unit 111 releases the hold on the first end of the chain 3 and allows the first end of the chain 3 to descend under its own weight to the lowest position. The "lowest position" here refers to the position at which the first end of the chain 3 can be lowered the furthest.

[0023] (First processing section) The first processing unit 12 is mainly composed of a computer system having one or more processors and a memory. The functions of the first processing unit 12 are realized by the processor of the computer system executing a program recorded in the memory of the computer system. The program may be recorded in the memory, or may be provided via a telecommunications line such as the Internet, or may be recorded on a non-transitory recording medium such as a memory card and provided.

[0024] 1, the first processing unit 12 includes a first motor control unit 121, a first communication control unit 122, a setting unit 123, an abnormality processing unit 124, a timer unit 125, and a thermal trip unit 126. The first motor control unit 121 corresponds to the first control unit of the present disclosure.

[0025] The first motor control unit 121 controls the first motor 11 in response to a control signal Si1 that the first communication unit 13 transmits and receives to the second communication unit 23. More specifically, the first motor control unit 121 controls the first motor 11 when the first communication unit 13 receives a control signal Si1b including a reception report, which will be described later, from the second communication unit 23. As a result, the first motor control unit 121 controls the first motor 11 in synchronization with the second motor control unit 221 of the auxiliary device 2. In other words, the first motor control unit 121 controls the first motor 11 so as to raise and lower the first end of the chain 3 at the same timing as the second motor 21 raises and lowers the second end of the chain 3.

[0026] The first motor control unit 121 controls the first motor 11 using setting information stored in a setting storage unit 151 (described later) of the storage unit 15. The setting information includes a preset lifting distance and lifting speed at which the first motor 11 raises and lowers the chain 3. The lifting distance here refers to the amount of lowering required for the chain 3 to reach the lowering stop position from its current position, or the amount of lifting required for the chain 3 to reach the upper stop position from its current position. In other words, the setting information includes the preset lowering stop position, upper stop position, and lifting speed.

[0027] The first motor control unit 121 controls the first motor 11 to lower the first end of the chain 3 to a predetermined lowering stop position at a predetermined lifting speed. Then, the first motor control unit 121 controls the first brake unit 111 of the first motor 11 to hold the first end of the chain 3, which has been lowered to the lowering stop position, at the lowering stop position for a predetermined time. After the predetermined time has elapsed, the first motor control unit 121 controls the first motor 11 to raise the first end of the chain 3 to a predetermined upper stop position at a predetermined lifting speed. Thereafter, the first motor control unit 121 controls the first brake unit 111 of the first motor 11 to hold the first end of the chain 3, which has been raised to the upper stop position, at the upper stop position until the next time the first motor control unit 121 is controlled.

[0028] In this embodiment, when lowering the first end of the chain 3, the first motor control unit 121 controls the first motor 11 to lower the first end of the chain 3 at a preset lifting speed until just before the lowering stop position, and then decelerates the lifting speed. This configuration can prevent the chain 3 from strongly colliding with a chain pit (not shown) provided to accommodate the chain 3. This has the advantage of reducing the impact noise when the chain 3 collides with the chain pit.

[0029] The first communication control unit 122 controls the first communication unit 13. In this embodiment, the first communication control unit 122 controls the first communication unit 13 to transmit a control signal Si1a related to control of the second motor 21 to the second communication unit 23 when the reception unit 16 described later receives a request to raise or lower the chain from an external device (not shown).

[0030] When a communication failure occurs between the first communication unit 13 and the second communication unit 23, the first communication control unit 122 controls the first photoelectric sensor 14 to transmit and receive a control signal Si1 related to the control of the first motor 11 and the second motor 21 by performing two-way optical communication with the second photoelectric sensor 24.

[0031] The setting unit 123 sets setting information used when the first motor control unit 121 controls the first motor 11 and when the second motor control unit 221 controls the second motor 21, and stores the setting information in the setting storage unit 151. As described above, the setting information includes the preset lowering stop position, upper stop position, and lifting speed.

[0032] The setting unit 123 lowers the first and second ends of the chain 3, and stores the positions of the first and second ends of the chain 3 at the time when the load sensor 18 detects a load equal to or greater than a predetermined value as lowering stop positions in the setting memory 151. The setting unit 123 also raises the first and second ends of the chain 3, and stores the positions of the first and second ends of the chain 3 at the time when the load sensor 18 detects a load equal to or greater than a predetermined value as lifting stop positions in the setting memory 151. The setting unit 123 stores in the setting memory 151 a lifting / lowering speed that is set in advance by the user of the vehicle or the administrator of the chain gate system 100, etc.

[0033] The setting unit 123 of this embodiment stores, in the setting storage unit 151, the position of the rotor of the first motor detected by the rotation angle detection unit 17 (described later) at the time when the load detection unit 18 detects a load equal to or greater than a predetermined value, as the lowering stop position or the raising stop position of the first end of the chain 3. Similarly, the setting unit 123 of this embodiment stores, in the setting storage unit 151, the position of the rotor of the second motor detected by the rotation angle detection unit 25 (described later) of the auxiliary device 2 at the time when the load detection unit 18 detects a load equal to or greater than a predetermined value, as the lowering stop position or the raising stop position of the second end of the chain 3.

[0034] The abnormality processing unit 124 acquires abnormality information regarding an abnormality that has occurred in the main machine 1, and stores the abnormality information in the abnormality storage unit 152, which will be described later. The abnormality information here refers to information regarding the nature of the abnormality that has occurred in the main machine 1, the number of times the abnormality has occurred, and the like. Furthermore, the abnormality that has occurred in the main machine 1 here includes, for example, a load abnormality in which the load sensing unit 18 senses a load equal to or greater than a predetermined value while the first motor control unit 121 is controlling the first motor 11, an obstacle abnormality in which the first photoelectric sensor 14, which will be described later, senses an obstacle, and a time abnormality in which the time required to raise and lower the first end of the chain 3 exceeds the expected time by a predetermined time or more. Note that abnormalities that have occurred in the main machine 1 are not limited to those described above.

[0035] Furthermore, the abnormality processing unit 124 acquires abnormality information related to an abnormality that has occurred in the auxiliary machine 2, and stores the abnormality information in the abnormality storage unit 152. More specifically, the abnormality processing unit 124 acquires abnormality information related to an abnormality that has occurred in the auxiliary machine 2, which the first communication unit 13 receives from the second communication unit 23. The abnormality information here refers to information related to the nature of the abnormality that has occurred in the auxiliary machine 2, the number of times the abnormality has occurred, and the like. Furthermore, the abnormality that has occurred in the auxiliary machine 2 here includes, for example, an obstacle abnormality in which a second photoelectric sensor 24 (described later) of the auxiliary machine 2 detects an obstacle, and a time abnormality in which the lifting / lowering time required to lift the second end of the chain 3 exceeds the expected time by a predetermined time or more. Note that the abnormality that has occurred in the auxiliary machine 2 is not limited to those described above.

[0036] When the abnormality processing unit 124 acquires abnormality information related to the above-mentioned load abnormality in the main machine 1, it controls the first brake unit 111 of the first motor 11 to release the hold on the first end of the chain 3 and allow the first end of the chain 3 to descend under its own weight to the lowest position. Similarly, when the abnormality processing unit 124 acquires abnormality information related to the above-mentioned time abnormality in the main machine 1 and the auxiliary machine 2, it controls the first brake unit 111 of the first motor 11 to release the hold on the first end of the chain 3 and allow the first end of the chain 3 to descend under its own weight to the lowest position.

[0037] Furthermore, if the abnormality processing unit 124 acquires abnormality information related to the above-mentioned obstacle abnormality in the main machine 1 and the auxiliary machine 2 while the first motor control unit 121 is controlling the first motor 11 to lower the first end of the chain 3, the abnormality processing unit 124 continues the above-mentioned control by the first motor control unit 121. On the other hand, if the abnormality processing unit 124 acquires abnormality information related to the above-mentioned obstacle abnormality while the first motor control unit 121 is controlling the first motor 11 to raise the first end of the chain 3, the abnormality processing unit 124 stops the above-mentioned control by the first motor control unit 121, releases the hold on the first end of the chain 3, and controls the first brake unit 111 of the first motor 11 to lower the first end of the chain 3 by its own weight to the lowest position.

[0038] The timer unit 125 stores timer information, which is set in advance by the user of the vehicle or the administrator of the chain gate system 100, in a timer storage unit 153 (described later). The timer information here is, for example, information that causes the first motor 11 to automatically lower the chain 3 during any predetermined time period, that is, without the need for a request for raising or lowering from an external device (not shown), and that causes the first brake unit 111 to hold the raised or lowered chain 3 at a lowering stop position.

[0039] Based on the timer information, the timer unit 125 causes the first motor control unit 121 to control the first motor 11 so that the first motor 11 automatically lowers the first end of the chain 3 and holds the first end of the chain 3 at a lowering stop position in a predetermined arbitrary time period. Furthermore, based on the timer information, the timer unit 125 causes the first motor control unit 121 to control the first motor 11 so that the first motor 11 automatically raises the first end of the chain 3 and holds the first end of the chain 3 at an upper stop position in a predetermined arbitrary time period.

[0040] Similarly, the timer unit 125 performs timer control based on the timer information to cause the second motor control unit 221 to control the second motor 21, described later, of the auxiliary device 2, so as to automatically lower the second end of the chain 3 and hold the second end of the chain 3 at a lowering stop position by the second brake unit 211, during the above-mentioned arbitrary time period. Furthermore, the timer unit 125 performs timer control based on the timer information to cause the second motor control unit 221 to control the second motor 21, described later, of the auxiliary device 2, so as to automatically raise the second end of the chain 3 and hold the second end of the chain 3 at an upper stop position by the second brake unit 211. The timer unit 125 controls the first communication unit 13 to transmit a control signal Si1a related to the above-mentioned timer control to the second communication unit 23, described later, of the auxiliary device 2.

[0041] The thermal trip unit 126 increments or decrements the thermal timer based on the control content of the first motor control unit 121. More specifically, while the first motor control unit 121 is controlling the first motor 11 to lower the first end of the chain 3, the thermal trip unit 126 increments the thermal timer by one second every second. Furthermore, while the first motor control unit 121 is controlling the first motor 11 to raise the first end of the chain 3, the thermal trip unit 126 increments the thermal timer by two seconds every second. On the other hand, while the first motor control unit 121 is controlling the first brake unit 111 of the first motor 11 to hold the first end of the chain 3 at the lowering stop position or the raising stop position, the thermal trip unit 126 decrements the thermal timer by one second every second.

[0042] When the thermal timer reaches a predetermined value (e.g., 900 seconds) or more, the thermal trip unit 126 causes the first motor control unit 121 to control the first motor 11 to lower the first end of the chain 3 until the thermal timer reaches 0 seconds, and to hold the first end of the raised or lowered chain 3 at a lowering stop position with the first brake unit 111. When the thermal timer reaches 0 seconds, the thermal trip unit 126 causes the first motor control unit 121 to control the first motor 11 to raise the first end of the chain 3 and to hold the first end of the chain 3 at an upper stop position with the first brake unit 111.

[0043] Similarly, when the thermal timer reaches a predetermined value or more, the thermal trip unit 126 performs thermal trip control to cause the second motor control unit 221 to control the second motor 21 to lower the second end of the chain 3 until the thermal timer reaches 0 seconds and to hold the second end of the raised or lowered chain 3 at a lowering stop position with the second brake unit 211. Then, when the thermal timer reaches 0 seconds, the thermal trip unit 126 performs thermal trip control to cause the second motor control unit 221 to control the second motor 21 to raise the second end of the chain 3 and to hold the second end of the chain 3 at an upper stop position with the second brake unit 211. The thermal trip unit 126 controls the first communication unit 13 to transmit a control signal Si1a related to the thermal trip control to the second communication unit 23 of the auxiliary device 2.

[0044] (1st Communications Department) The first communication unit 13 is a communication module capable of wireless communication with the second communication unit 23. In this disclosure, "wireless communication" refers to communication using radio waves as a medium, and includes Bluetooth (registered trademark) or Wi-Fi (registered trademark), etc. The first communication unit 13 transmits and receives a control signal Si1 related to control of the first motor 11 and the second motor 21 to and from the second communication unit 23 via wireless communication. The control signal Si1 in this embodiment includes a start instruction to start raising and lowering the chain 3, a setting instruction to specify the amount and speed of raising and lowering the chain 3, and a reception report reporting that the start instruction and setting instruction have been received.

[0045] When the receiving unit 16, which will be described later, receives a lifting / lowering request requesting lifting / lowering of the chain 3 from an external device (not shown), the first communication unit 13 of this embodiment transmits a control signal Si1a (see FIG. 1) including the above-mentioned start instruction and the above-mentioned setting instruction to the second communication unit 23 under the control of the first communication control unit 122. The lifting amount and lifting speed indicated by the setting instruction of this embodiment are stored as setting information in the setting storage unit 151. The first communication unit 13 of this embodiment receives a control signal Si1b (see FIG. 1) including the above-mentioned reception report from the second communication unit 23.

[0046] The first communication unit 13 of this embodiment transmits a control signal Si1a related to the above-mentioned timer control to the second communication unit 23 based on the control of the timer unit 125. Also, the first communication unit 13 of this embodiment transmits a control signal Si1a related to the above-mentioned thermal trip control to the second communication unit 23 based on the control of the thermal trip unit 126.

[0047] The first communication unit 13 transmits and receives abnormality information related to an abnormality that has occurred in the main engine 1 and the auxiliary engine 2 to the second communication unit 23 via wireless communication. More specifically, the first communication unit 13 transmits abnormality information related to an abnormality that has occurred in the main engine 1, which is acquired by the abnormality processing unit 124, to the second communication unit 23. The first communication unit 13 receives abnormality information related to an abnormality that has occurred in the auxiliary engine 2 from the second communication unit 23.

[0048] (First photoelectric sensor) The first photoelectric sensor 14 has a light-emitting unit and a light-receiving unit. The light-emitting unit of the first photoelectric sensor 14 outputs light to the light-receiving unit of the second photoelectric sensor 24 of the auxiliary machine 2. The light-receiving unit of the first photoelectric sensor 14 is configured to be able to receive the light output from the light-emitting unit of the second photoelectric sensor 24. The first photoelectric sensor 14 detects an obstacle when the light output from the light-emitting unit of the second photoelectric sensor 24 is not input to the light-receiving unit. In this disclosure, the term "obstacle" refers to, for example, a vehicle attempting to pass between the main machine 1 and the auxiliary machine 2.

[0049] More specifically, the first photoelectric sensor 14 detects an obstacle while the first end of the chain 3 is held at the lowering stop position. When the first photoelectric sensor 14 detects an obstacle while the first end of the chain 3 is held at the lowering stop position, the abnormality processing unit 124 of the main machine 1 controls the first motor 11 not to raise the first end of the chain 3 to the upper stop position and to maintain the state in which the first end of the chain 3 is held at the lowering stop position. Similarly, the abnormality processing unit 223 of the accessory 2, which will be described later, controls the second motor 21 not to raise the second end of the chain 3 to the upper stop position and to maintain the state in which the second end of the chain 3 is held at the lowering stop position in the above case.

[0050] Furthermore, the first photoelectric sensor 14 detects an obstacle while the first motor control unit 121 controls the first motor 11 to lower or raise the first end of the chain 3. If the first photoelectric sensor 14 detects an obstacle while the first motor control unit 121 controls the first motor 11 to lower or raise the first end of the chain 3, the abnormality processing unit 124 of the main machine 1 controls the first brake unit 111 of the first motor 11 to release the hold on the first end of the chain 3 and allow the first end of the chain 3 to descend under its own weight to the lowest position. Similarly, the abnormality processing unit 223 of the accessory 2 controls the second brake unit 211 of the second motor 21 to release the hold on the second end of the chain 3 and allow the second end of the chain 3 to descend under its own weight to the lowest position. This configuration can prevent (suppress) damage to the chain gate system 100 or a vehicle attempting to pass between the main machine 1 and the accessory 2.

[0051] Furthermore, when the light receiving portion of the first photoelectric sensor 14 does not receive light output from the light emitting portion of the second photoelectric sensor 24 for a predetermined period of time, the abnormality processing portion 124 of the main machine 1 controls the first motor 11 to lower the first end of the chain 3 to the lowering stop position. Similarly, the abnormality processing portion 223 of the accessory 2 controls the second motor 21 to lower the second end of the chain 3 to the lowering stop position in the above case. With this configuration, malfunction of the first photoelectric sensor 14 due to snow, dirt, etc. can be detected, and it is possible to prevent (suppress) a situation in which the vehicle cannot pass between the main machine 1 and the accessory 2.

[0052] The first photoelectric sensor 14 transmits and receives a control signal Si1 related to the control of the first motor 11 and the second motor 21 by performing bidirectional optical communication with the second photoelectric sensor 24. The first communication control unit 122 converts the above-mentioned control signal Si1a into flashing light according to a predetermined format and causes the light-emitting unit of the first photoelectric sensor 14 to output the above-mentioned light to the light-receiving unit of the second photoelectric sensor 24. The first communication control unit 122 also obtains the above-mentioned control signal Si1b by converting the flashing light received by the light-receiving unit of the first photoelectric sensor 14 from the light-emitting unit of the second photoelectric sensor 24 according to a predetermined format. The first communication control unit 122 performs the above-mentioned operation, for example, when a communication failure occurs between the first communication unit 13 and the second communication unit 23.

[0053] (Storage part) The storage unit 15 includes a rewritable nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory). The storage unit 15 includes a setting storage unit 151, an abnormality storage unit 152, and a timer storage unit 153. The setting storage unit 151 stores setting information used when the first motor control unit 121 controls the first motor 11 and when the second motor control unit 221 controls the second motor 21. The abnormality storage unit 152 stores abnormality information acquired by the abnormality processing unit 124. The timer storage unit 153 stores timer information used by the timer unit 125.

[0054] (Reception Department) The reception unit 16 receives a request for raising or lowering the chain 3 from an external device (not shown). As described above, the external device is, for example, a dedicated remote controller carried by a user of a vehicle that intends to pass over the chain 3. The communication method between the reception unit 16 and the external device is a wireless communication method that complies with standards such as Bluetooth (registered trademark), infrared-based radio, or low-power radio that does not require a license (specified low-power radio).

[0055] (Rotation angle detection unit) The rotation angle detection unit 17 detects the position of the rotor of the first motor and outputs the detection result to the first processing unit 12.

[0056] (Load sensing part) The load sensor 18 detects the load applied to the first motor 11 from the chain 3. Specifically, the load sensor 18 detects the load by monitoring the current flowing through the first motor 11. The load sensor 18 may also detect the load by measuring the pressure applied to the first motor 11 from the chain 3.

[0057] (Display) The display unit 19 has a plurality of lamps such as an abnormal lamp, an upper limit lamp, a lower limit lamp, a reception lamp, and a photoelectric lamp.

[0058] The abnormality lamp on the display unit 19 lights up when the abnormality processing unit 124 acquires abnormality information related to an abnormality that has occurred in the main engine 1 or the auxiliary engine 2. The upper limit lamp on the display unit 19 lights up when the first and second ends of the chain 3 are held in the raised stop position. The lower limit lamp on the display unit 19 lights up when the first and second ends of the chain 3 are held in the lowered stop position or when the first and second ends of the chain 3 are positioned lower than the lowered stop position (for example, when the first end of the chain 3 has been lowered by its own weight to the lowest position). The reception lamp on the display unit 19 lights up when the reception unit 16 receives a lifting / lowering request from an external device requesting that the chain be raised or lowered. The photoelectric lamp on the display unit 19 lights up when the first photoelectric sensor 14 detects an obstacle.

[0059] (2-3) Auxiliary As shown in FIG. 1, the auxiliary machine 2 includes a second motor 21, a second processing unit 22, a second communication unit 23, a second photoelectric sensor 24, and a rotation angle detection unit 25.

[0060] (Second motor) The second motor 21 raises and lowers the second end of the chain 3 based on the control content of a second motor control unit 221 (described later) of the second processing unit 22. The second motor 21 is, for example, a brushless motor. The second end of the chain 3 is connected (coupled) to the output shaft of the second motor 21 so that the second end of the chain 3 is lowered (moved downward) by rotation of the second motor 21 in a first direction and the second end of the chain 3 is raised (moved upward) by rotation of the second motor 21 in a second direction.

[0061] When lowering the second end of the chain 3, the second motor 21 lowers the second end of the chain 3 to a preset lowering stop position based on the control content of the second motor control unit 221. When raising the second end of the chain 3, the second motor 21 raises the second end of the chain 3 to a preset upper stop position based on the control content of the second motor control unit 221.

[0062] The second motor 21 has a second brake unit 211 that holds the second end of the ascending or descending chain 3. Furthermore, the second brake unit 211 holds the second end of the ascending or descending chain 3 at a descending stop position or an ascending stop position based on the control content of the second motor control unit 221.

[0063] Based on the control content of the abnormality processing unit 124, the second brake unit 211 releases the hold on the second end of the chain 3 and allows the second end of the chain 3 to descend under its own weight to the lowest position. The "lowest position" here refers to the position at which the second end of the chain 3 can be lowered the furthest.

[0064] (Second processing section) The second processing unit 22 is mainly composed of a computer system having one or more processors and a memory. The functions of the second processing unit 22 are realized by the processor of the computer system executing a program recorded in the memory of the computer system. The program may be recorded in the memory, or may be provided via a telecommunications line such as the Internet, or may be provided by being recorded on a non-transitory recording medium such as a memory card.

[0065] 1, the second processing unit 22 has a second motor control unit 221, a second communication control unit 222, and an abnormality processing unit 223. The second motor control unit 221 corresponds to the second control unit in the present disclosure.

[0066] The second motor control unit 221 controls the second motor 21 in accordance with the control signal Si1 that the first communication unit 13 transmits and receives to the second communication unit 23. More specifically, the second motor control unit 221 controls the second motor 21 when the second communication unit 23 transmits a control signal Si1b including a reception report to the first communication unit 13. As a result, the second motor control unit 221 controls the second motor 21 in synchronization with the first motor control unit 121 of the main machine 1. In other words, the second motor control unit 221 controls the second motor 21 so as to raise and lower the second end of the chain 3 at the same timing as the first motor 11 raises and lowers the first end of the chain 3.

[0067] The second motor control unit 221 controls the second motor 21 based on the control signal Si1a received by the second communication unit 23 from the first communication unit 13. The control signal Si1a includes setting instructions that instruct the lift amount and lift speed for raising and lowering the chain 3.

[0068] The second motor control unit 221 controls the second motor 21 to lower the second end of the chain 3 to a predetermined lowering stop position at a predetermined lifting speed. Then, the second motor control unit 221 controls the second brake unit 211 of the second motor 21 to hold the second end of the chain 3, which has been lowered to the lowering stop position, at the lowering stop position for a predetermined time. After the predetermined time has elapsed, the second motor control unit 221 controls the second motor 21 to raise the second end of the chain 3 to a predetermined upper stop position at a predetermined lifting speed. Thereafter, the second motor control unit 221 controls the second brake unit 211 of the second motor 21 to hold the second end of the chain 3, which has been raised to the upper stop position, at the upper stop position until the next time the second motor 21 is controlled.

[0069] In this embodiment, when lowering the second end of the chain 3, the second motor control unit 221 controls the second motor 21 to lower the second end of the chain 3 at a preset lifting speed until just before the lowering stop position, and then decelerates the lifting speed. This configuration can prevent the chain 3 from strongly colliding with a chain pit (not shown) provided to accommodate the chain 3. This has the advantage of reducing the impact noise when the chain 3 collides with the chain pit.

[0070] The second communication control unit 222 controls the second communication unit 23. When the second communication control unit 222 receives a control signal Si1a including a start instruction and a setting instruction from the first communication unit 13, the second communication control unit 222 in this embodiment controls the second communication unit 23 to transmit a control signal Si1b related to control of the first motor 11 to the first communication unit 13. The control signal Si1b includes a reception report reporting that the start instruction and the setting instruction have been received.

[0071] When a communication failure occurs between the first communication unit 13 and the second communication unit 23, the first communication control unit 122 controls the second photoelectric sensor 24 to transmit and receive a control signal Si1 related to the second motor 21 and the control of the second motor 21 by performing two-way optical communication with the first photoelectric sensor 14.

[0072] The abnormality processing unit 223 acquires abnormality information related to an abnormality that has occurred in the auxiliary machine 2. The abnormality processing unit 223 also acquires abnormality information related to an abnormality that has occurred in the main machine 1. More specifically, the abnormality processing unit 223 acquires abnormality information related to an abnormality that has occurred in the main machine 1, which the second communication unit 23 receives from the first communication unit 13.

[0073] When abnormality processing unit 223 acquires abnormality information related to a load abnormality in the main machine 1, it controls the first brake unit 111 of the first motor 11 to release the hold on the second end of the chain 3 and allow the second end of the chain 3 to descend under its own weight to the lowest position. Similarly, when abnormality processing unit 223 acquires abnormality information related to a time abnormality in the main machine 1 and the auxiliary machine 2, it controls the first brake unit 111 of the first motor 11 to release the hold on the second end of the chain 3 and allow the second end of the chain 3 to descend under its own weight to the lowest position.

[0074] Furthermore, if the abnormality processing unit 223 acquires abnormality information related to an obstacle abnormality in the main machine 1 and the auxiliary machine 2 while the second motor control unit 221 is controlling the second motor 21 to lower the second end of the chain 3, the abnormality processing unit 223 continues the above control by the second motor control unit 221. On the other hand, if the abnormality processing unit 223 acquires abnormality information related to the above obstacle abnormality while the second motor control unit 221 is controlling the second motor 21 to raise the second end of the chain 3, the abnormality processing unit 223 stops the above control by the second motor control unit 221, releases the hold on the second end of the chain 3, and controls the second brake unit 211 of the second motor 21 to lower the second end of the chain 3 by its own weight to the lowest position.

[0075] (Second Communications Department) The second communication unit 23 is a communication module capable of wireless communication with the first communication unit 13. The second communication unit 23 transmits and receives a control signal Si1 related to the control of the first motor 11 and the second motor 21 to and from the first communication unit 13 via wireless communication. As described above, the control signal Si1 in this embodiment includes a start instruction to start raising and lowering the chain 3, a setting instruction to specify the amount and speed of raising and lowering the chain 3, and a reception report to report that the start instruction and the setting instruction have been received.

[0076] The second communication unit 23 of this embodiment receives a control signal Si1a (see FIG. 1) including the above-mentioned start instruction and the above-mentioned setting instruction from the first communication unit 13. When the second communication unit 23 of this embodiment receives the control signal Si1a from the first communication unit 13, it transmits a control signal Si1b (see FIG. 1) including the above-mentioned reception report to the first communication unit 13 based on the control of the second communication control unit 222.

[0077] The second communication unit 23 of this embodiment receives a control signal Si1a related to timer control from the first communication unit 13. The second communication unit 23 of this embodiment also receives a control signal Si1a related to thermal trip control from the first communication unit 13.

[0078] The second communication unit 23 transmits and receives abnormality information related to an abnormality that has occurred in the main engine 1 and the auxiliary engine 2 to the first communication unit 13 via wireless communication. More specifically, the second communication unit 23 transmits abnormality information related to an abnormality that has occurred in the auxiliary engine 2, which is acquired by the abnormality processing unit 223, to the first communication unit 13. The second communication unit 23 receives abnormality information related to an abnormality that has occurred in the main engine 1 from the first communication unit 13.

[0079] (Second photoelectric sensor) The second photoelectric sensor 24 has a light-emitting section and a light-receiving section. The light-emitting section of the second photoelectric sensor 24 outputs light to the light-receiving section of the first photoelectric sensor 14 of the main engine 1. The light-receiving section of the second photoelectric sensor 24 is configured to be able to receive the light output from the light-emitting section of the first photoelectric sensor 14. The second photoelectric sensor 24 detects an obstacle when the light output from the light-emitting section of the first photoelectric sensor 14 is not input to the light-receiving section.

[0080] More specifically, the second photoelectric sensor 24 detects an obstacle while the second end of the chain 3 is held at the lowering stop position. When the second photoelectric sensor 24 detects an obstacle while the second end of the chain 3 is held at the lowering stop position, the abnormality processing unit 124 of the main machine 1 controls the first motor 11 not to raise the first end of the chain 3 to the upper stop position and to maintain the state in which the first end of the chain 3 is held at the lowering stop position. Similarly, the abnormality processing unit 223 of the accessory 2 controls the second motor 21 in the above case not to raise the second end of the chain 3 to the upper stop position and to maintain the state in which the second end of the chain 3 is held at the lowering stop position.

[0081] Furthermore, the second photoelectric sensor 24 detects an obstacle while the second motor control unit 221 controls the second motor 21 to lower or raise the second end of the chain 3. If the second photoelectric sensor 24 detects an obstacle while the second motor control unit 221 controls the second motor 21 to lower or raise the second end of the chain 3, the abnormality processing unit 124 of the main machine 1 controls the first brake unit 111 of the first motor 11 to release the hold on the first end of the chain 3 and allow the first end of the chain 3 to descend under its own weight to the lowest position. Similarly, the abnormality processing unit 223 of the accessory 2 controls the second brake unit 211 of the second motor 21 to release the hold on the second end of the chain 3 and allow the second end of the chain 3 to descend under its own weight to the lowest position. This configuration can prevent (suppress) damage to the chain gate system 100 or a vehicle attempting to pass between the main machine 1 and the accessory 2.

[0082] Furthermore, the abnormality processing unit 124 of the main engine 1 controls the first motor 11 to lower the first end of the chain 3 to the lowering stop position when the light receiving unit of the second photoelectric sensor 24 does not receive light output from the light emitting unit of the first photoelectric sensor 14 for a predetermined period of time. Similarly, the abnormality processing unit 223 of the accessory 2 controls the second motor 21 to lower the second end of the chain 3 to the lowering stop position in the above case. With this configuration, malfunction of the second photoelectric sensor 24 due to snow, dirt, etc. can be detected, and it is possible to prevent (suppress) a situation in which the vehicle cannot pass between the main engine 1 and the accessory 2.

[0083] The second photoelectric sensor 24 transmits and receives a control signal Si1 related to the control of the first motor 11 and the second motor 21 by performing bidirectional optical communication with the first photoelectric sensor 14. The second communication control unit 222 converts the above-mentioned control signal Si1b into flashing light according to a predetermined format and causes the light-emitting unit of the second photoelectric sensor 24 to output the above-mentioned light to the light-receiving unit of the first photoelectric sensor 14. The second communication control unit 222 also obtains the above-mentioned control signal Si1a by converting the flashing light received by the light-receiving unit of the second photoelectric sensor 24 from the light-emitting unit of the first photoelectric sensor 14 according to a predetermined format. The second communication control unit 222 performs the above-mentioned operation, for example, when a communication failure occurs between the first communication unit 13 and the second communication unit 23.

[0084] (Rotation angle detection unit) The rotation angle detection unit 25 detects the position of the rotor of the second motor. The second communication control unit 222 controls the second communication unit 23 to transmit the detection result of the rotation angle detection unit 25 to the first communication unit 13 of the main engine 1. The first communication unit 13 outputs the received detection result of the rotation angle detection unit 25 to the first processing unit 12.

[0085] (3) Operation Next, the operation of the chain gate system 100 of this embodiment to raise and lower the chain 3 will be described with reference to Fig. 2. In the following description, it is assumed that a user of a vehicle about to pass through the chain gate system 100 issues a request for raising and lowering the chain 3 using an external device (not shown).

[0086] First, the reception unit 16 of the main machine 1 receives the above-mentioned lifting / lowering request from an external device (step S1). Then, the first communication unit 13 transmits a control signal Si1a including the above-mentioned start instruction and setting instruction to the second communication unit 23 based on the control of the first communication control unit 122 (step S2). The second communication unit 23 of the auxiliary machine 2 receives the control signal Si1a from the first communication unit 13.

[0087] Thereafter, the second communication unit 23, under the control of the second communication control unit 222, transmits a control signal Si1b including the above-mentioned reception report to the first communication unit 13 (step S3).

[0088] Then, the first motor control unit 121 controls the first motor 11 in synchronization with the second motor control unit 221 of the accessory 2 (step S4). More specifically, in step S4, the first motor control unit 121 controls the first motor 11 to raise and lower the first end of the chain 3 at the same timing as the second motor 21 raises and lowers the second end of the chain 3 in step S5, which will be described later.

[0089] Similarly, the second motor control unit 221 controls the second motor 21 in synchronization with the first motor control unit 121 of the main machine 1 (step S5). More specifically, in step S5, the second motor control unit 221 controls the second motor 21 to raise and lower the second end of the chain 3 at the same timing as the first motor 11 raises and lowers the first end of the chain 3 in step S4 described above. That is, steps S4 and S5 are performed at the same timing.

[0090] (4) Advantages The chain gate system 100 of this embodiment includes a main machine 1, an accessory 2, and a chain 3. The main machine 1 includes a first motor 11, a first motor control unit 121, and a first communication unit 13. The accessory 2 includes a second motor 21, a second motor control unit 221, and a second communication unit 23. The chain 3 is connected between the main machine 1 and the accessory 2. The first motor 11 raises and lowers a first end of the chain 3 based on the control content of the first motor control unit 121. The second motor 21 raises and lowers a second end of the chain 3 based on the control content of the second motor control unit 221. The first communication unit 13 and the second communication unit 23 transmit and receive control signals related to the control of the first motor 11 and the second motor 21 to and from each other via wireless communication. As a result, in the chain gate system 100 of this embodiment, there is no need to lay a signal cable between the main machine 1 and the accessory 2 during construction to transmit and receive control signals related to the control of the first motor 11 and the second motor 21 to and from each other. Therefore, the chain gate system 100 of this embodiment has the advantage of being able to improve convenience during construction.

[0091] In the chain gate system 100 of this embodiment, the main machine 1 further includes a first photoelectric sensor 14, and the auxiliary machine 2 further includes a second photoelectric sensor 24. The first photoelectric sensor 14 and the second photoelectric sensor 24 transmit and receive control signals Si1 to and from each other by performing bidirectional optical communication. This has the effect of allowing the main machine 1 and the auxiliary machine 2 to transmit and receive control signals Si1 to and from each other even if a communication failure occurs between the first communication unit 13 and the second communication unit 23. As a result, there is an advantage in that the chain 3 can be raised and lowered even if a communication failure occurs between the first communication unit 13 and the second communication unit 23.

[0092] In the chain gate system 100 of this embodiment, the control signal Si1 includes a start instruction to start raising and lowering the chain 3, a setting instruction to specify the amount and speed of raising and lowering the chain 3, and a reception report to report that the start instruction and setting instruction have been received. This has the advantage that, during construction, there is no need to lay communication cables for sending and receiving the start instruction, setting instruction, or reception report.

[0093] In the chain gate system 100 of this embodiment, the main machine 1 further includes a reception unit 16 that receives a lifting / lowering request from an external device to lift or lower the chain 3. When the reception unit 16 receives a lifting / lowering request from an external device to lift or lower the chain 3, the first communication unit 13 transmits the start instruction and the setting instruction to the second communication unit 23. When the second communication unit 23 receives the start instruction and the setting instruction from the first communication unit 13, it transmits the reception report to the first communication unit 13. When the first communication unit 13 receives the reception report from the second communication unit 23, the first motor control unit 121 controls the first motor 11. This has the advantage of making it easier for the first motor control unit 121 to control the first motor 11 in synchronization with the second motor control unit 221 of the auxiliary machine 2.

[0094] In the chain gate system 100 of this embodiment, the first communication unit 13 and the second communication unit 23 transmit and receive abnormality information relating to abnormalities occurring in the main engine 1 and the auxiliary engine 2 via wireless communication. This has the advantage that there is no need to lay communication cables for transmitting and receiving abnormality information during construction.

[0095] (5) Variations The above-described embodiment is merely one of various embodiments of the present disclosure. The above-described embodiment can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. The following modifications may be implemented in appropriate combination. The same components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0096] In the above-described embodiment, the control signal Si1 includes a start instruction to start raising and lowering the chain 3, a setting instruction to specify the amount and speed of raising and lowering the chain 3, and a reception report reporting that the start instruction and the setting instruction have been received. However, the control signal Si1 may include at least one of a start instruction to start raising and lowering the chain 3, a setting instruction to specify the amount and speed of raising and lowering the chain 3, and a reception report reporting that the start instruction and the setting instruction have been received.

[0097] In the above-described embodiment, only the main machine 1 has the receiving unit 16. However, the accessory 2 may have a receiving unit having a configuration similar to that of the receiving unit 16 of the main machine 1. When the receiving unit of the accessory 2 receives a lifting / lowering request from an external device (not shown) requesting that the chain 3 be lifted or lowered, the second communication unit 23, under the control of the second communication control unit 222, transmits a control signal Si1b including a start instruction to start lifting or lowering the chain 3 to the first communication unit 13. Then, when the first communication unit 13 receives the control signal Si1b including the start instruction from the second communication unit 23, under the control of the first communication control unit 122, it transmits a control signal Si1a including a setting instruction for instructing the lifting amount and lifting speed for lifting or lowering the chain 3 to the second communication unit 23. Thereafter, when the second communication unit 23 receives a control signal Si1a including a setting instruction from the first communication unit 13 based on the control of the second communication control unit 222, it transmits a control signal Si1b including a reception report reporting that the setting instruction has been received to the first communication unit 13.

[0098] The auxiliary machine 2 may also have a load sensor having a similar configuration to the load sensor 18 of the main machine 1. Furthermore, the auxiliary machine 2 may also have a display having a similar configuration to the display 19 of the main machine 1.

[0099] In the above-described embodiment, only the first processing unit 12 of the main engine 1 has the thermal trip unit 126. However, the second processing unit 22 of the auxiliary engine 2 may have a thermal trip unit that performs control similar to that of the thermal trip unit 126 of the first processing unit 12.

[0100] In the above-described embodiment, the second power cable C2 electrically connects the main machine 1 and the auxiliary machine 2, and supplies the power received by the main machine 1 from the external power supply PW1 to the auxiliary machine 2. However, the second power cable C2 may electrically connect the external power supply PW1 and the auxiliary machine 2, and supply power from the external power supply PW1 to the auxiliary machine 2.

[0101] (summary) A chain gate system (100) of a first aspect includes a main machine (1), an accessory (2), and a chain (3). The main machine (1) has a first motor (11), a first control unit (121), and a first communication unit (13). The accessory (2) has a second motor (21), a second control unit (221), and a second communication unit (23). The chain (3) is connected between the main machine (1) and the accessory (2). The first motor (11) raises and lowers a first end of the chain (3) based on the control content of the first control unit (121). The second motor (21) raises and lowers a second end of the chain (3) based on the control content of the second control unit (221). The first communication unit (13) and the second communication unit (23) transmit and receive control signals (Si1) related to the control of the first motor (11) and the second motor (21) to and from each other via wireless communication.

[0102] This embodiment has the advantage of improving convenience during construction.

[0103] In the chain gate system (100) of the second aspect, in the first aspect, the main machine (1) further includes a first photoelectric sensor (14). The auxiliary machine (2) further includes a second photoelectric sensor (24). The first photoelectric sensor (14) and the second photoelectric sensor (24) transmit and receive control signals (Si1) to and from each other by performing bidirectional optical communication.

[0104] This embodiment has the advantage that the chain (3) can be raised and lowered even if a communication failure occurs between the first communication unit (13) and the second communication unit (23).

[0105] In the chain gate system (100) of the third aspect, in the first or second aspect, the control signal (Si1) includes at least one of a start instruction to start raising and lowering the chain (3), a setting instruction to instruct the amount and speed at which the first motor (11) and the second motor (21) will raise and lower the chain (3), and a reception report to report that the start instruction and the setting instruction have been received.

[0106] This aspect has the advantage that it is not necessary to lay a communication cable for transmitting and receiving the start instruction, the setting instruction, or the reception report.

[0107] In a fourth aspect of the chain gate system (100), in the third aspect, the main machine (1) further includes a reception unit that receives a request for raising or lowering the chain (3) from an external device. When the reception unit receives the request for raising or lowering the chain (3), the first communication unit (13) transmits a start instruction and a setting instruction to the second communication unit (23). When the second communication unit (23) receives the start instruction and the setting instruction from the first communication unit (13), it transmits a reception report to the first communication unit (13). When the first communication unit (13) receives the reception report from the second communication unit (23), the first control unit (121) controls the first motor (11) to start raising or lowering the first end.

[0108] This embodiment has the advantage that the first motor control section (121) can easily control the first motor (11) in synchronization with the second motor control section (221).

[0109] In the chain gate system (100) of the fifth aspect, in any one of the first to fourth aspects, the first communication unit (13) and the second communication unit (23) transmit and receive abnormality information regarding abnormalities occurring in the main engine (1) and the auxiliary engine (2) to each other via wireless communication.

[0110] This embodiment has the advantage that it is not necessary to lay a communication cable for transmitting and receiving abnormality information. [Explanation of symbols]

[0111] 100 Chain Gate System 1 Main engine 11 First motor 121 First control unit (first motor control unit) 13 First Communications Department 14 First photoelectric sensor 16 Reception Department 2 Auxiliary equipment 21 Second motor 221 Second control unit (second motor control unit) 23 Second Communications Department 24 Second photoelectric sensor 3 Chain Si1 control signal

Claims

1. a main engine having a first motor, a first control unit, and a first communication unit; an auxiliary machine having a second motor, a second control unit, and a second communication unit; a chain connected between the main engine and the auxiliary engine, The first motor raises and lowers the first end of the chain based on the control content of the first control unit, The second motor raises and lowers the second end of the chain based on the control content of the second control unit, the first communication unit and the second communication unit transmit and receive control signals related to control of the first motor and the second motor to and from each other via wireless communication using radio waves, The main engine further includes a first photoelectric sensor, The auxiliary device further includes a second photoelectric sensor. The first photoelectric sensor and the second photoelectric sensor transmit and receive the control signal to each other by performing bidirectional optical communication. Chain gate system.

2. The control signal is a start instruction to start raising and lowering the chain; a setting instruction for instructing the lifting amount and lifting speed at which the first motor and the second motor lift and lower the chain; and a reception report reporting that the start instruction and the setting instruction have been received. The chain gate system of claim 1 .

3. The main machine further has a reception unit that receives a request for raising or lowering the chain from an external device, the first communication unit transmits the start instruction and the setting instruction to the second communication unit when the reception unit receives the lifting request; the second communication unit transmits the reception report to the first communication unit when the second communication unit receives the start instruction and the setting instruction from the first communication unit; the first control unit controls the first motor to start lifting and lowering the first end when the first communication unit receives the reception report from the second communication unit. The chain gate system according to claim 2 .

4. The first communication unit and the second communication unit transmit and receive abnormality information regarding abnormalities occurring in the main engine and the auxiliary engine via the wireless communication. The chain gate system according to any one of claims 1 to 3.

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