JP2009202981A - Counterweight attaching and detaching device of mobile crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a counterweight attaching and detaching device of a mobile crane for preventing cutting of a connection code 9 in the case that a connector 10 is not unconnected when canceling attachment of a counterweight 3 by a counterweight attaching and detaching means 5 wherein a counterweight attachment state detector 7 and a counter weight attachment state determining means 13 for determining an attachment state of the counterweight 3 are connected by the connector 10 and the connection code 9. <P>SOLUTION: An attachment and detachment restriction means 15 is provided to restrict attachment and detachment of a counter weight attaching and detaching means 5. The counter weight attachment state determining means 13 outputs a connection state signal 13a to the attachment and detachment restriction means 15 when the connector 10 is connected and an attachment state of the counterweight is detected and prevents the connection code 9 from being cut by restricting attachment and detachment of the counter weight attaching and detaching means 5 by the attachment and detachment restriction means 15 if the connector 10 is not unconnected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a counterweight attaching / detaching device for a mobile crane.

As shown in FIG. 6, a counterweight attaching / detaching device for this type of mobile crane A includes a swivel base 2 mounted on a vehicle 1 so as to be capable of being swiveled, and a counterweight 3 attached to the rear end of the swivel base 2. A mounting table 4 provided on the vehicle 1 for mounting the counterweight 3 and a counterweight attaching / detaching means 5 for mounting / dismounting the counterweight 3 mounted on the mounting table 4 to / from the rear end of the swivel base 2 are provided. . That is, since the counterweight 3 is heavy, when moving the mobile crane A, the counterweight 3 is mounted from the rear of the swivel 2 of the mobile crane A in order to reduce the vehicle weight of the mobile crane A. The counterweight 3 is released and mounted on a separate vehicle for transportation. At the work site, the counterweight 3 is attached to the mobile crane A as follows. First, the counterweight 3 is lifted from a separately mounted vehicle by the mobile crane A and placed on the mounting table 4 of the mobile crane A. Next, after the suspension of the counterweight 3 by the mobile crane A is released, the swivel base 2 of the mobile crane A is swiveled and is positioned directly above the counterweight 3 on which the rear part of the swivel base 2 is placed. Then, the counterweight 3 is attached to the swivel base 2 by means of the counterweight attaching / detaching means 5 (hydraulic cylinder for detaching the counterweight) provided at the rear part of the swivel base 2. (For example, see Patent Document 1)
By the way, in the mobile crane A, as shown in FIG. 7, the safety device 6 is provided so that the mobile crane A may not fall down by the suspended load suspended. The safety device 6 monitors the mobile crane A. When the allowable suspension load is determined by the safety device 6, the mounting state of the counterweight 3 attached to the rear part of the swivel base 2 is determined. Since the counter weight 3 is equipped with a counter weight mounting state detector 7 that detects the mounting state of the counter weight 3 and outputs a mounting signal 7a, the mounting signal 7a from the counter weight mounting state detector 7 is turned. The counter weight mounting state discriminating means 8 provided in the safety device 6 provided on the side of the table 2 is inputted to the counter weight mounting state discriminating means 8 of the safety device 6 and receives the mounting signal 7a to determine the mounting state of the counter weight 3. The allowable suspension load for the mounted state of the counterweight 3 is determined. Then, the counterweight mounting state detector 7 mounted on the counterweight 3 mounted on the rear part of the swivel base 2 and the counterweight mounting state determination means 8 of the safety device 6 on the swivel base 2 side are connected by the connection cord 9 and the connector 10. When releasing the counterweight 3 from the rear part of the swivel base 2, the connector 10 is removed and then the attachment is released. (For example, see Patent Document 2)
Utility Model Registration No. 2545740 (2nd page, FIG. 1) JP 2008-1444 (6th page, FIG. 4)

However, when the mounting of the counterweight 3 is released (the counterweight 3 is mounted on the mounting table 4 from the rear part of the swivel base 2), forgetting to remove the connector 10 and the mounting of the counterweight 3 is canceled (the counterweight 3 is removed). In some cases, the connection cord 9 is cut off at this time. It is also possible to lengthen the connection cord 9 so that the connection cord 9 is not cut even if the counterweight 3 is released (the counterweight 3 is placed on the mounting table 4 from the rear of the swivel base 2). Forgetting to remove the connector 10 and turning the swivel base 2 would cause the connection cord 9 to be disconnected. An object of this invention is to provide the counterweight attachment / detachment apparatus of the mobile crane which prevents such a subject.

In order to achieve the above object, a counterweight attaching / detaching device for a mobile crane according to claim 1 according to the present invention includes a swivel mounted on a vehicle so as to be capable of swiveling, and a counter attached to a rear end portion of the swivel. A weight, a mounting table provided on the vehicle for mounting the counterweight, a counterweight attaching / detaching means for attaching / detaching the counterweight mounted on the mounting table to the rear end of the swivel base, and a counterweight mounted on the counterweight. Counterweight mounting state detector that detects mounting and outputs a mounting signal, and counterweight mounting state determination means that receives the mounting signal from the counterweight mounting state detector provided on the swivel base and determines the mounting state of the counterweight And a connection cord for connecting the counterweight mounting state detector and the counterweight mounting state determining means; The counterweight is attached to the rear end of the swivel with the counterweight attaching / detaching means, and the counterweight attachment state detector and the counterweight attachment state determining means are connected with the connection cord and the connector. In the mobile crane counterweight attachment / detachment device in which the connector is removed when releasing the weight attachment, the counterweight attachment state discriminating means is connected when the attachment signal is received from the counterweight attachment state detector. It is characterized in that it is provided with attachment / detachment restricting means for determining the state and outputting a connection state signal and for restricting attachment / detachment of the counterweight attaching / detaching means in response to the connection state signal. .
According to a second aspect of the present invention, there is provided a counterweight attaching / detaching device for a mobile crane, on which a swivel mounted on a vehicle so as to be capable of swiveling, a counterweight attached to a rear end of the swivel, and a counterweight provided on the vehicle. A counterweight mounted on the counterweight, and a counterweight mounted on the counterweight that detects the mounting of the counterweight and outputs a mounting signal. A state detector, a counter weight mounting state determination means for determining the mounting state of the counter weight in response to the mounting signal from the counter weight mounting state detector provided on the swivel side, a counter weight mounting state detector, and a counter weight mounting A connection cord and a connector for connecting the state discriminating means are provided. When the counterweight is attached by the counterweight attaching / detaching means, the counterweight attachment state detector and the counterweight attachment state discriminating means are connected by the connection cord and the connector, and the connector is detached when releasing the attachment of the counterweight. In the mobile crane counterweight attachment / detachment device, the connector connection state detection means for detecting the connection state of the connector and the detection signal from the connector connection state detection means detection means are used to determine that the connector is in the connection state. Connector connection state determining means for outputting a connection state signal, and attachment / detachment restriction means for receiving the connection state signal and restricting attachment / detachment of the counterweight attachment / detachment means.
A counterweight attaching / detaching device for a mobile crane according to a third aspect of the present invention is the counterweight attaching / detaching device according to the first or second aspect, wherein the counterweight attaching / detaching means is constituted by a hydraulic cylinder arranged between a rear part of the swivel base and a counterweight. The restriction means is characterized in that at least the extension of the hydraulic cylinder is restricted.

  According to a fourth aspect of the present invention, there is provided a counterweight attaching / detaching device for a mobile crane, which includes a swivel mounted on a vehicle so as to be capable of being swiveled, a counterweight attached to a rear end of the swivel, and a counterweight provided on the vehicle. And a counterweight attaching / detaching means for attaching / detaching the counterweight mounted on the mounting table to the rear end of the turntable, and a counterweight mounted on the counterweight for detecting the mounting state of the counterweight and outputting a mounting signal. A mounting state detector; counter weight mounting state determining means for determining a mounting state of the counter weight in response to the mounting signal from the counter weight mounting state detector mounted on the swivel side; a counter weight mounting state detector and a counter It is equipped with a connection cord and a connector for connecting the weight mounting state discriminating means to the rear of the swivel When the counterweight is attached to the part by the counterweight attaching / detaching means, the counterweight attachment state detector and the counterweight attachment state discriminating means are connected by the connection cord and the connector, and when releasing the attachment of the counterweight, the connector is connected. In the counterweight attaching / detaching device of the mobile crane that has been removed, the counterweight mounting state determining means determines that the connector is in a connected state when receiving a mounting signal from the counterweight mounting state detector, and a connection state signal A placement detection means for detecting that the counterweight is placed on the placement table and outputting a placement signal; and a connection state signal from the counterweight attachment state determination means; When a placement signal is received from the placement detection means, a turning restriction signal is received. And a turning restriction means for restricting turning driving of the turntable in response to a turning restriction signal.

According to a fifth aspect of the present invention, there is provided a counterweight attaching / detaching device for a mobile crane, which includes a swivel mounted on a vehicle so as to be capable of being swiveled, a counterweight attached to a rear end of the swivel, and a counterweight provided on the vehicle. And a counterweight attaching / detaching means for attaching / detaching the counterweight mounted on the mounting table to the rear end of the turntable, and a counterweight mounted on the counterweight for detecting the mounting state of the counterweight and outputting a mounting signal. A mounting state detector; counter weight mounting state determining means for determining a mounting state of the counter weight in response to the mounting signal from the counter weight mounting state detector mounted on the swivel side; a counter weight mounting state detector and a counter It is equipped with a connection cord and a connector for connecting the weight mounting state discriminating means to the rear of the swivel When the counterweight is attached to the part by the counterweight attaching / detaching means, the counterweight attachment state detector and the counterweight attachment state discriminating means are connected by the connection cord and the connector, and when releasing the attachment of the counterweight, the connector is connected. In the mobile crane counterweight attachment / detachment device
Connector connection state detecting means for detecting the connection state of the connector, and connector connection state determining means for receiving a detection signal from the connector connection state detecting means detecting means and determining that the connector is in a connected state and outputting a connection state signal A placement detection means for detecting that the counterweight is placed on the placement table and outputting a placement signal; a connection state signal from the connector connection state determination means; and a placement detection means from the placement detection means. It is characterized by comprising a turning drive discriminating means for outputting a turning restriction signal when receiving a placement signal, and a turning restriction means for restricting the turning drive of the turntable upon receiving the turning restriction signal.

   According to a sixth aspect of the present invention, there is provided a counterweight attaching / detaching device for a mobile crane, including a swivel mounted on a vehicle so as to be capable of swiveling, a counterweight attached to a rear end of the swivel, and a counterweight provided on the vehicle. And a counterweight attaching / detaching means for attaching / detaching the counterweight mounted on the mounting table to the rear end of the turntable, and a counterweight mounted on the counterweight for detecting the mounting state of the counterweight and outputting a mounting signal. A mounting state detector; counter weight mounting state determining means for determining a mounting state of the counter weight in response to the mounting signal from the counter weight mounting state detector mounted on the swivel side; a counter weight mounting state detector and a counter It is equipped with a connection cord and a connector for connecting the weight mounting state discriminating means to the rear of the swivel When the counterweight is attached to the part by the counterweight attaching / detaching means, the counterweight attachment state detector and the counterweight attachment state discriminating means are connected by the connection cord and the connector, and when releasing the attachment of the counterweight, the connector is connected. In the counterweight attaching / detaching device of the mobile crane that is to be removed, a placement detecting means that detects that the counterweight is placed on the placing table and is placed on the placing weight, and outputs a placement signal; and A turning drive determining means for outputting a turning restriction signal to the turning restriction means when receiving a placement signal; and a turning restriction means for restricting the turning drive of the turntable in response to the turning restriction signal. The signal is configured to be input to the turning drive determining means after passing through the connector. It is a feature.

  According to a seventh aspect of the present invention, there is provided the counterweight attaching / detaching device for a mobile crane according to the fourth or fifth aspect, wherein the placement detecting means is arranged on the vehicle side so that the counterweight is placed on the placement table. It is characterized by comprising a detector.

  A counterweight attaching / detaching device for a mobile crane according to an eighth aspect of the present invention is the apparatus according to any one of the fourth to sixth aspects, wherein the position detecting means is arranged on the swivel base or the counterweight side that the counterweight is mounted on the mounting base. It is characterized by comprising the mounted detector.

  A counterweight attaching / detaching device for a mobile crane according to a ninth aspect of the present invention is the counterweight attaching / detaching device according to the fourth to sixth aspects, wherein the counterweight attaching / detaching means is constituted by a hydraulic cylinder disposed between a rear part of the swivel base and a counterweight. The above-described position detecting means is constituted by an extension detector that detects that the hydraulic cylinder is extended by a predetermined amount or more.

  According to a tenth aspect of the present invention, there is provided a counterweight attaching / detaching device for a mobile crane according to any one of the first to ninth aspects, wherein the counterweight includes a plurality of counterweights, and the counterweight mounting state detector is mounted in the plurality of counterweights. Further, the detector is capable of identifying counterweights.

  According to a first aspect of the present invention, there is provided a counterweight attaching / detaching device for a mobile crane, wherein the counterweight mounting state determining means determines that the connector is in a connected state when receiving a mounting signal from the counterweight mounting state detector. Since the connection status signal is output to the attachment / detachment restricting means, and the attachment / detachment restricting means restricts the attachment / detachment of the counterweight attaching / detaching means, forgetting to remove the connector accidentally and releasing the counterweight (counterweight Even if it is attempted to place the counterweight on the mounting table of the vehicle, the attachment / detachment restricting means can restrict the attachment / detachment of the counterweight attaching / detaching means to prevent the connection cord from being cut.

  In the counterweight attaching / detaching device for a mobile crane according to the second aspect of the present invention, the connector connection state determining means receives the detection signal from the connector connection state detecting means, determines that the connector is in the connected state, and connects to the attachment restricting means. Since the status signal is output and the attachment / detachment restricting means restricts the attachment / detachment of the counterweight attaching / detaching means, forgetting to remove the connector by mistake and releasing the attachment of the counterweight (the counterweight is removed from the vehicle mounting table) The attachment / detachment restricting means can restrict the attachment / detachment of the counterweight attaching / detaching means to prevent the connection cord from being cut.

  According to a third aspect of the present invention, there is provided a counterweight attaching / detaching device for a mobile crane according to the first or second aspect, wherein the counterweight attaching / detaching means comprises a hydraulic cylinder, and the attaching / detaching restricting means restricts at least the extension of the hydraulic cylinder. Thus, it is possible to prevent the counterweight from being released (the counterweight is placed on the mounting table of the vehicle) by the extension of the hydraulic cylinder. Therefore, it is possible to prevent the counterweight from being unintentionally released (mounting the counterweight on the mounting table of the vehicle) by forgetting to remove the connector by mistake.

  According to a fourth aspect of the present invention, there is provided a counterweight attaching / detaching device for a mobile crane, wherein the counterweight mounting state determining means determines that the connector is in a connected state when receiving a mounting signal from the counterweight mounting state detector. A connection state signal is output, the placement detection means detects that the counterweight is placed on the placement table and outputs a placement signal, and the turning drive determination means places the connection state signal and placement. Since it receives the signal and outputs a turning restriction signal to the turning restriction means to restrict the turning drive of the turntable, even if you forget to remove the connector accidentally and try to turn the turntable, the turning restriction means It is possible to prevent the connection cord from being cut by restricting the turning drive of the turntable.

  In the counterweight attaching / detaching device for a mobile crane according to the fifth aspect of the present invention, the connector connection state determination means receives the detection signal from the connector connection state detection means, determines that the connector is in the connection state, and outputs the connection state signal. The placement detection means detects that the counterweight is placed on the placement table and outputs a placement signal, and the turning drive determination means receives the connection state signal and the placement signal and turns. Since the turning restriction signal is output to the restricting means to restrict the turning drive of the turntable, even if you forget to remove the connector by mistake and try to turn the turntable, the turning restriction means will turn the turntable. It is possible to prevent the connection cord from being cut by restricting driving.

  A counterweight attaching / detaching device for a mobile crane according to a sixth aspect of the present invention is a mounting detection for detecting that the counterweight is mounted on the mounting table and outputting a mounting signal. And a turning drive determining means for outputting a turning restriction signal to the turning restriction means when receiving the placement signal, and a turning restriction means for restricting the turning drive of the turntable upon receiving the turning restriction signal. Since the placement signal is configured to be input to the turning drive discrimination means after passing through the connector, the turning drive discrimination means can also determine that the connector is connected only by receiving the placement signal. it can. Therefore, even if you forget to remove the connector accidentally and try to turn the swivel, if the turn drive determining means receives the placement signal, it outputs a turn restricting signal to the turn restricting means. Therefore, it is possible to prevent the connection cord from being cut by restricting the turning drive.

  According to a seventh aspect of the present invention, there is provided a counterweight attaching / detaching device for a mobile crane according to the fourth or fifth aspect, wherein the counterweight is mounted on the mounting base on the vehicle side. Since it is comprised by the mounting detector, it can detect that the counterweight was mounted in the mounting base with the said detector.

  According to an eighth aspect of the present invention, there is provided a counterweight attaching / detaching device for a mobile crane according to the fourth aspect of the present invention, in which the counterweight is mounted on the mounting table according to the fourth to sixth aspects. Therefore, it is possible to detect that the counterweight is mounted on the mounting table with the detector.

  According to a ninth aspect of the present invention, there is provided a counterweight attaching / detaching device for a mobile crane according to the present invention, wherein the counterweight attaching / detaching means is a hydraulic cylinder disposed between a rear portion of the swivel base and a counterweight at an appropriate position. In addition, since the above-mentioned position detection means is composed of an extension detector that detects that the hydraulic cylinder is extended by a predetermined amount or more, the counterweight is mounted on the mounting table by the extension of the hydraulic cylinder. Can be detected at the turntable side.

  The counterweight attaching / detaching device for a mobile crane according to a tenth aspect of the present invention is the counterweight attaching / detaching device according to any one of the first aspect to the ninth aspect, wherein the counterweight attached state detector detects a detection signal identifying the attached state of the attached counterweight. Therefore, the counterweight mounting state determining means can determine the mounting state of the mounted counterweight with a detection signal that identifies the mounting state of the mounted counterweight.

  Hereinafter, an embodiment of a counterweight attaching / detaching device for a mobile crane according to the present invention will be described with reference to FIGS. In explaining the counterweight attaching / detaching device for a mobile crane according to the present invention, the symbols 1 to 5, the symbols 7 to 10, the symbols 7a and the symbols A shown in FIGS. 6 and 7 are the same in the following description. Detailed description will be omitted.

  First, a first embodiment of a counterweight attaching / detaching device for a mobile crane according to the present invention will be described with reference to FIG. In FIG. 1, the attaching / detaching operation means 11 is the counterweight attaching / detaching means 5 (specifically, a hydraulic cylinder disposed between the rear part of the swivel base 2 and the counterweight 3 and will be described as the hydraulic cylinder 5 in the following description). )), A control signal is output to the hydraulic cylinder extension control means 12a when the hydraulic cylinder 5 is extended, and a control signal is output to the hydraulic cylinder reduction control means 12b when the hydraulic cylinder 5 is reduced. Means. The counterweight mounting state discriminating means 13 receives the mounting signal 7a from the counterweight mounting state detector 7, determines the mounting state of the counterweight 3, and determines the allowable suspension load in the mounted state of the counterweight 3. And the connection state signal 13a is output to the attachment / detachment restricting means 15 described below when the attachment signal 7a from the counterweight attachment state detector 7 is not received. Therefore, the counterweight mounting state discriminating means 13 of the safety device 14 has the function of the counterweight mounting state discriminating means 8 of the safety device 6 described in the prior art, and a mounting signal from the counterweight mounting state detector 7 is provided. The difference is that a function of outputting the connection status signal 13a when not receiving 7a is added.

  The attachment / detachment restricting means 15 is interposed in a transmission circuit for transmitting an extension operation signal from the attachment / detachment operation means 11 to the hydraulic cylinder extension control means 12a, and receives the connection state signal 13a from the counterweight attachment state determination means 13 to receive the transmission circuit. It is a means to block. That is, when the connector 10 is connected, the counterweight mounting state discriminating means 13 receives the mounting signal 7a from the counterweight mounting state detector 7, outputs the connection state signal 13a to the attachment / detachment restricting means 15, and the hydraulic cylinder extension control means 12a. The operation of the is regulated.

  The counterweight attaching / detaching device according to the mobile crane according to the present invention configured as described above operates as follows. When the mounting of the counterweight 3 is released (the counterweight 3 mounted on the rear end of the swivel base 2 is mounted on the mounting table 4), the attaching / detaching operation means 11 is operated to remove the hydraulic pressure by removing the connector 10 The cylinder 5 is operated to extend. However, since the counterweight mounting state determination means 13 receives the mounting signal 7a from the counterweight mounting state detector 7 because the connector 10 is not removed, it outputs a connection state signal 13a to the attachment / detachment restriction means 15. Therefore, the attachment / detachment restricting means 15 interrupts the transmission circuit that transmits the extension operation signal from the attachment / detachment operation means 11 to the hydraulic cylinder extension control means 12a, so that the hydraulic cylinder 5 does not extend. Therefore, even if it is forgotten to unplug the connector 10 by mistake and the counterweight 3 is unmounted (the counterweight 3 is placed on the mounting table 4 of the vehicle 1), the hydraulic cylinder 5 is extended. Does not expand, and the connection cord 9 can be prevented from being cut.

  On the other hand, when the mounting of the counterweight 3 is released (the counterweight 3 mounted at the rear end of the swivel base 2 is mounted on the mounting table 4), the connector 10 is removed and then the attaching / detaching operation means 11 is operated. Then, the hydraulic cylinder 5 is operated to extend. Then, since the counterweight mounting state discriminating means 13 does not receive the mounting signal 7a from the counterweight mounting state detector 7 because the connector 10 is removed, the connection weight signal 13a is not output to the attachment / detachment restricting means 15. . Therefore, since the transmission / reception circuit for transmitting the extension operation signal from the attachment / detachment operation means 11 to the hydraulic cylinder extension control means 12a is not interrupted by the attachment / detachment restriction means 15, the hydraulic cylinder 5 can be extended based on the extension operation of the attachment / detachment operation means 11. The mounting of the counterweight 3 can be released (the counterweight 3 is mounted on the mounting table 4).

  Next, in the above embodiment, when the connection state of the connector 10 is detected by the counterweight attachment state determination means 13 when the attachment state 7a is detected by receiving the attachment signal 7a from the counterweight attachment state detector 7, the connector 10 If the connector 10 is determined to be connected and cannot be detected, the connector 10 is determined not to be connected. Whether the connector 10 is connected can be detected as a counterweight. Instead, it may be provided with a dedicated detection means for determining whether or not the connector 10 is in a connected state. Hereinafter, an embodiment in this case will be described as a second embodiment with reference to FIG.

  In FIG. 2, the counterweight mounting state detector 7 and the counterweight mounting state determination means 8 described in the prior art are connected by a connector 16 and a connection cord 17. The connector 16 includes a detector side connector 16a provided in the counterweight mounting state detector 7 and a connection cord side connector 16b to be fitted to the connector 16a. The detector-side connector 16a has a circuit separate from the counterweight mounting state detection, and the circuit is short-circuited to the body. The short-circuit of the other circuit in the detector-side connector 16a causes the connector connection state detection means 18 to It is composed.

  The separate circuit is input to the connector connection state determination means 19 provided in the safety device 20 via the connection cord side connector 16b and the connection cord 17 that are fitted. The connector connection state discriminating means 19 outputs the connection state signal 19a to the aforementioned attachment / detachment restricting means 15 when the input signal is a short circuit signal, and does not output the connection state signal 19a unless the input signal is a short circuit signal. . Therefore, the safety device 20 is different from the above-described safety device 14 in that the function of determining the connector connection state is not provided in the counterweight mounting state determination unit 8 but the dedicated connector connection state determination unit 19 is provided. .

  The counterweight attaching / detaching device according to the mobile crane of the second embodiment configured as described above operates as follows. When the mounting of the counterweight 3 is released (the counterweight 3 mounted on the rear end of the swivel base 2 is mounted on the mounting table 4), the attachment / detachment operation means 11 is operated to remove the hydraulic pressure by removing the connector 16 The cylinder 5 is operated to extend. However, since the connector connection state discriminating means 19 receives the short circuit signal from the connector connection state detection means 18 since the connector 16 is not removed, it outputs the connection state signal 19a to the attachment / detachment restriction means 15. Therefore, the attachment / detachment restricting means 15 interrupts the transmission circuit that transmits the extension operation signal from the attachment / detachment operation means 11 to the hydraulic cylinder extension control means 12a, so that the hydraulic cylinder 5 does not extend. Therefore, even if the user forgets to remove the connector 16 by mistake and tries to extend the hydraulic cylinder 5 so that the mounting of the counterweight 3 is released (the counterweight 3 is mounted on the mounting table 4 of the vehicle 1), The connection cord 17 can be prevented from being cut without being extended.

  On the other hand, when the mounting of the counterweight 3 is released (the counterweight 3 mounted on the rear end portion of the swivel base 2 is mounted on the mounting table 4), the connector 16 is removed and then the attaching / detaching operation means 11 is operated. Then, the hydraulic cylinder 5 is operated to extend. Then, the connector connection state determination means 19 does not receive the short-circuit signal from the connector connection state detection means 18 because the connector 16 is removed, and therefore does not output the connection state signal 19a to the attachment / detachment restriction means 15. Therefore, since the transmission / reception circuit for transmitting the extension operation signal from the attachment / detachment operation means 11 to the hydraulic cylinder extension control means 12a is not interrupted by the attachment / detachment restriction means 15, the hydraulic cylinder 5 can be extended based on the extension operation of the attachment / detachment operation means 11. The mounting of the counterweight 3 can be released (the counterweight 3 is mounted on the mounting table 4).

  Next, in the second embodiment, the connector connection state detection means 18 is constituted by a short circuit of another circuit in the detector-side connector 16a, and the connector connection state determination means 19 detects a short circuit of another circuit and determines the connector connection state. However, as another example of the second embodiment, determination may be made by another method using a dedicated circuit. For example, the identification signal output from the connector connection state determination means 19 is fed back through the connector 16 by a dedicated circuit, and the connector 16 is connected by receiving the returned identification signal at the connector connection state determination means 19. It may be determined that the connector 16 is not connected because the identification signal does not return when the connector 16 is removed.

  In the embodiment described above, the extension of the hydraulic cylinder 5 is restricted by the attachment / detachment restricting means 15, but both the extension and the reduction may be restricted. Further, the attachment / detachment restriction means 15 is not interposed from the attachment / detachment operation means 11 to the transmission circuit of the hydraulic cylinder extension control means 12a or the hydraulic cylinder extension control means 12b, but the hydraulic source for operating the hydraulic cylinder 5 by the attachment / detachment restriction means is unloaded. You may make it regulate. Further, in the above-described embodiment, the hydraulic cylinder 5 is disposed on the rear side of the swivel base 2 as illustrated in FIG. 3, but may be disposed on the counterweight 3 side. In the above embodiment, the case where the hydraulic cylinder 5 is arranged as the counterweight attaching / detaching means has been described. However, the counterweight 3 may be attached / detached by another means such as a winch or a wire rope.

  Next, in the above embodiment, when the counterweight 3 is attached to or detached from the mounting table 4 with the hydraulic cylinder 5 provided in the swivel base 2, the hydraulic cylinder 5 may be driven without forgetting to remove the connector 10 or the connector 16. The attachment / detachment restricting means 15 restricts the drive of the hydraulic cylinder 5 to prevent the extension connecting cord 9 or the connecting cord 17 from being disconnected. However, the mounting of the counterweight 3 is released (the counterweight 3 is turned). The connection cords 9 and 17 can be made longer so that the connection cords 9 and 17 are not cut even if they are placed on the mounting table 4 from the rear of the table 2. However, even if the connecting cords 9 and 17 are lengthened, if the swivel base 2 is driven to forget to remove the connectors 10 and 16, the connecting cords 9 and 17 are also disconnected, so that the counterweight 3 is mounted. A description will be given below of an embodiment in which the swivel base 2 cannot be driven to rotate if it is forgotten to remove the connectors 10 and 16 in the state of being placed on the base 4 with reference to FIGS.

  FIG. 3 is an explanatory view for explaining a third embodiment of a counterweight attaching / detaching device for a mobile crane according to the present invention, and is obtained by adding a restriction of turning drive to the embodiment of FIG. Therefore, the reference numerals shown and used in FIG. 1 are the same here, and the description is omitted by using the same reference numerals. In FIG. 3, the placement detection means 31 is a detection means for detecting that the counterweight 3 is placed on the placement table 4 and outputting a placement signal 31 a, and the counterweight 3 is placed on the placement table 4 on the vehicle 1 side. It is comprised with the detector which detects having mounted | worn with a switch or a load. Further, the mounting detection means 31 may be detection means that is arranged on the swivel base 2 side or the counterweight side and detects a state in which the counterweight 3 is not mounted on the mounting base 4. 3 is a distance detector that detects that the distance of 3 is more than a predetermined distance by light or ultrasonic waves, a detector that directly detects that the distance is not attached by a switch, and the hydraulic cylinder 5 is extended by a predetermined amount or more. It can be detected by a detector configured to detect this.

  Further, as disclosed in the cited reference 1 cited as the prior art, a structure in which the counterweight 3 is attached to and detached from the rear part of the swivel base 2 by expanding and contracting the hydraulic cylinder 5 and rotating the piston rod, and locking the attachment and detachment by rotating the piston rod. In this case, the placement detecting means 31 may be configured by detecting non-locking due to rotation.

  The turning drive determination means 32 is a means for receiving the placement signal 31a from the position detection means 31 and the connection state signal 13a from the counterweight mounting state determination means 13 and outputting a turning restriction signal 32a. Therefore, the safety device 30 shown in FIG. 3 has a turning drive determining means 32 added to the safety device 14 shown and described in FIG.

  The turning operation means 33 is an operation means that outputs a turning operation signal 33 a that is manually operated to turn the turntable 2. The turning drive control means 34 is a control means for receiving a turning operation signal 33a from the turning operation means 33 and controlling a turning drive means (a turning motor, a speed reducer, etc.) that drives the turntable 2 to turn. The turning restriction means 35 is interposed in a transmission path for transmitting the turning operation signal 33a from the turning operation means 33 to the turning drive control means 34, and receives the turning restriction signal 32a from the turning drive determination means 32 and transmits the turning control signal 33a. It is a means to block the road.

  The third embodiment of the counterweight attachment / detachment device for a mobile crane according to the present invention configured as described above operates as follows. First, when the counterweight 3 is mounted on the mounting table 4 with the connector 10 connected, the connection cord 9 is shortened and cut off, which is the same as that illustrated in FIG. Description is omitted.

  The case where the hydraulic cylinder 5 is extended with the connector 10 connected and the counterweight 3 is mounted on the mounting table 4 will not be cut because the connection cord 9 is elongated. When the swivel base 2 is swiveled under such circumstances, the following effects are obtained. The placement detection means 31 outputs the placement signal 31 a to the turning drive determination means 32 since the counterweight 3 is placed on the placement table 4. Since the connector 10 is connected, the mounting signal 7a is input from the counterweight mounting state detector 7 to the counterweight mounting state determination means 13, and the connection state signal 13a is input from the counterweight mounting state determination means 13 to the turning drive determination means 32. Is output. The turning drive determination means 32 receives the placement signal 31a from the position detection means 31 and the connection state signal 13a from the counterweight mounting state determination means 13, and outputs the turning restriction signal 32a to the turning restriction means 35. To do. The turning restriction means 35 blocks the transmission path for transmitting the turning operation signal 33 a from the turning operation means 33 to the turning drive control means 34, and the turning operation signal 33 a is supplied to the turning drive control means 34 even if the turning operation means 33 is operated. Do not let to communicate.

  Therefore, even if the swivel base 2 is swung while the connector 10 is connected while the counterweight 3 is released (the counterweight 3 is placed from the rear of the swivel base 2 on the mounting base 4), the swivel base 2 Since the second turning drive cannot be performed, disconnection of the connection cord 9 can be prevented.

  On the contrary, in the state where the connector 10 is removed, the connection state signal 13a is not output from the counterweight mounting state determining means 13 to the turning drive re-separating means 32, so that the turning drive determining means 32 turns to the turning restriction means 35. The restriction signal 32a is not output. Therefore, the turning restricting means 35 does not block the transmission path for transmitting the turning operation signal 33a from the turning operation means 33 to the turning drive control means 34, so that the mounting of the counterweight 3 is released (the counterweight 3 is turned). If the connection of the connector 10 is removed in a state where it is mounted on the mounting table 4 from the rear part of the table 2, the swivel table 2 can be driven to rotate.

  Further, when the counterweight 3 is mounted on the swivel base 2, the placement detection means 31 does not output the placement signal 31 a to the turning drive determination means 32 because the counterweight 3 is not placed on the placement base 4. . Since the connector 10 is connected, the mounting signal 7a is input from the counterweight mounting state detector 7 to the counterweight mounting state determination means 13, and the connection state signal 13a is input from the counterweight mounting state determination means 13 to the turning drive determination means 32. Is output.

  The turning drive discriminating means 32 receives the connection state signal 13a from the counterweight mounting state discriminating means 13, but does not receive the placement signal 31a from the placement detecting means 31. Therefore, the turning restriction signal 32a is sent to the turning restriction means 32a. Do not output to 35. Therefore, the turning restriction means 35 does not block the transmission path for transmitting the turning operation signal 33a from the turning operation means 33 to the turning drive control means 34. Therefore, when the counterweight 3 is attached to the turntable 2 The swivel base 2 can be swung while the connector 10 is connected, thereby enabling swiveling during crane operation.

  Since the placement signal 31a from the placement detection means 31 is input to the turning drive determination means 32 provided in the safety device 30 on the turntable 2 side, the detector of the placement detection means 31 is used as a vehicle. Since the mounting signal 31a needs to be connected from the vehicle 1 to the swivel base 2 via a rotary joint or wireless connection, the detector of the above-described position detecting means 31 is connected to the swivel base side or counterweight. It is more suitable to arrange on the side because there is no need to connect via a rotary joint or radio.

  Next, a fourth embodiment in which the above-described turning drive restriction is applied to the second embodiment illustrated and described in FIG. 2 will be illustrated in FIG. 4 and described below. In the embodiment illustrated in FIG. 4, the same components as those illustrated in FIGS. 2 and 3 are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 4, a safety device 40 is obtained by adding the turning drive determining means 32 to the safety device 20 shown and described in FIG. And although the said turning drive discrimination | determination means 32 was inputting the connection state signal 13a, it is made to input the connection state signal 19a here.

  Since it is apparent that the fourth embodiment configured as described above operates in the same manner as the third embodiment, detailed description thereof is omitted here.

  Furthermore, an embodiment of a development example of a counterweight attaching / detaching device for a mobile crane according to the present invention is shown as a fifth example in FIG. In FIG. 5, the placement detection means 51 is a detection means that is arranged on the counterweight 3 side and detects that the counterweight 3 is placed on the placement table 4 and outputs a placement signal 51a. 4 is a distance detector that detects that the distance between the counterweight 3 and the lower surface of the counterweight 3 is less than a predetermined distance by light or ultrasonic waves, or directly that the mounting table 4 and the counterweight 3 are not separated from each other. A detector that directly detects with a switch disposed on the lower surface of the counterweight 3, a detector that detects that the hydraulic cylinder 5 is extended by a predetermined amount or more, and the like.

  Further, as disclosed in the cited reference 1 cited as the prior art, a structure in which the counterweight 3 is attached to and detached from the rear part of the swivel base 2 by expanding and contracting the hydraulic cylinder 5 and rotating the piston rod, and locking the attachment and detachment by rotating the piston rod. In this case, the placement detecting means 51 may be configured by detecting non-locking due to rotation. In this case, the hydraulic cylinder 5 may be disposed on the counterweight 3 side, and detection of non-locking may be detected on the counterweight side.

  The turning drive determination unit 52 is a determination unit that receives the placement signal 51 a from the position detection unit 51 and outputs a turning restriction signal 52 a to the turning restriction unit 35. The connector 53 connects the mounting signal 7a input from the counterweight mounting detector 7 to the counterweight mounting state determination means 13 and the mounting signal 51a input from the position detection means 51 to the turning drive determination means 52. It is a connector to be connected through a cord 54. That is, since the placement signal 51a is input to the turning drive determination means 52 after passing through the connector 53, the connector 53 is connected when the turning drive determination means 52 receives the placement signal 51a. It is made to be able to discriminate simultaneously.

  Therefore, the safety device 50 includes the counterweight mounting state determination 13 and the turning drive determination unit 52, and the turning drive determination unit 52 does not use the connection state signal 13a from the counterweight mounting state determination 13. This is different from the third embodiment of FIG.

  Also in the fifth embodiment configured as described above, the same effects as those of the third embodiment and the fourth embodiment can be obtained. That is, when the placement detection means 51 detects that the counterweight 3 is placed on the placement table 4 and outputs the placement signal 51a, and the connector 53 is connected, the placement signal 51a is The turning drive determination means 52 outputs the turning restriction signal 52a to the turning restriction means 35, and the turning restriction means 35 turns the turning operation signal 33a from the turning operation means 33 to turn driving control. Even if the turning path 33 is operated and the turning operation means 33 is operated, the turning operation signal 33 a is not transmitted to the turning drive control means 34.

  Therefore, even if the swivel base 2 is swung while the connector 53 is connected with the counterweight 3 being released (the counterweight 3 is placed from the rear part of the swivel base 2 on the mounting base 4), the swivel base 2 Since the second turning drive cannot be performed, disconnection of the connection cord 54 can be prevented.

  On the contrary, in the state where the connector 53 is removed, the placement signal 51a from the placement detection means 51 is not input to the turning drive determination means 52. Therefore, the turning drive determination means 52 controls the turning restriction means 35 to turn. The signal 52a is not output. Therefore, the turning restricting means 35 does not block the transmission path for transmitting the turning operation signal 33a from the turning operation means 33 to the turning drive control means 34. Therefore, if the connector 53 is disconnected, the turning of the turntable 2 is turned off. Enable driving.

  Further, when the counterweight 3 is mounted on the swivel base 2, the placement detection means 51 does not output the placement signal 51 a to the turning drive determination means 52 because the counterweight 3 is not placed on the placement base 4. . Although the connector 53 is connected, the placement signal 51 a is not input to the turning drive determining means 52, so that the turning drive determining means 52 does not output the turning restriction signal 52 a to the turning restriction means 35. Therefore, the turning restricting means 35 does not block the transmission path for transmitting the turning operation signal 33a from the turning operation means 33 to the turning drive control means 34, and thus enables the turntable 2 to be turned. Therefore, in a state where the counterweight 3 is mounted on the swivel base 2 and the connector 53 is connected, the swivel base 2 during the crane operation can be swung, and the mounting signal 7a from the counterweight mounting state detector 7 is transmitted to the counterweight. It is possible to input to the mounting state discriminating means 8 and discriminate the mounting state of the counterweight 3 so that the crane can be safely operated.

  In the third to fifth embodiments, the embodiment is described as having both the drive restriction of the hydraulic cylinder 5 and the turning drive restriction of the swivel base 2, but only the turning drive restriction is described. It may be provided.

  In addition, a plurality of counterweights 3 to be mounted on the rear part of the swivel base 2 in each of the above embodiments can be mounted, and the counterweight is mounted by selecting as appropriate according to the lifting load required at the work site. Yes. Therefore, the counterweight mounting state detecting means 7 detects the mounting signal 7a that can detect and identify the mounting state of the counterweight mounted on the rear part of the swivel base 2, and outputs it as a signal.

It is a block diagram explaining 1st Embodiment of the counterweight attachment / detachment apparatus of the mobile crane which concerns on this invention. It is a block diagram explaining 2nd Embodiment of the counterweight attachment / detachment apparatus of the mobile crane which concerns on this invention. It is a block diagram explaining 3rd Embodiment of the counterweight attachment / detachment apparatus of the mobile crane which concerns on this invention. It is a block diagram explaining 4th Embodiment of the counterweight attachment / detachment apparatus of the mobile crane which concerns on this invention. It is a block diagram explaining 5th Embodiment of the counterweight attachment / detachment apparatus of the mobile crane which concerns on this invention. It is explanatory drawing explaining the counterweight attachment / detachment apparatus of the mobile crane which concerns on this invention. It is a block diagram explaining the counterweight attachment / detachment apparatus of the conventional mobile crane.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Turntable 3 Counterweight 4 Mounting base 5 Counterweight attachment / detachment means (hydraulic cylinder)
7 Counterweight attachment state detection means 7a Placement signal 8 Counterweight attachment state determination means 9 Connection cord 10 Connector 13a Connection state signal 15 Attachment / removal restriction means 16 Connector 17 Connection code 18 Connector connection state detection means 19 Connector connection state determination means 19a Connection Status signal 31 Placement detection means 31a Placement signal 32 Turn drive determination means 32a Turn restriction signal 35 Turn restriction means 51 Placement detection means 51a Placement signal 52 Turn drive determination means 52a Turn restriction signal 53 connector 54 Connection code

Claims (10)

A swivel mounted on the vehicle so as to be capable of swiveling, a counterweight attached to the rear end of the swivel, a mounting table provided on the vehicle for mounting the counterweight, and a counterweight mounted on the mounting table A counterweight attaching / detaching means for attaching / detaching to / from the rear end of the swivel base, a counterweight mounting state detector which is mounted on the counterweight and detects a mounting state of the counterweight and outputs a mounting signal, and the counterweight mounted on the swivel base side. A counterweight mounting state determining means for determining the mounting state of the counterweight in response to the mounting signal from the mounting state detector; a connection cord for connecting the counterweight mounting state detector and the counterweight mounting state determining means; and a connector. A counterweight is attached to the rear end of the swivel base using the counterweight attaching / detaching means. A counterweight attachment / detachment device for a mobile crane which connects the counterweight attachment state detector and the counterweight attachment state determination means with the connection cord and the connector when disconnected, and removes the connector when releasing the attachment of the counterweight. In
The counterweight mounting state determination means determines that the connector is in a connected state when receiving a mounting signal from the counterweight mounting state detector, and outputs a connection state signal and receives the connection state signal. A counterweight attaching / detaching device for a mobile crane, further comprising attaching / detaching restricting means for restricting attachment / detachment of the counterweight attaching / detaching means. A swivel mounted on the vehicle so as to be capable of swiveling, a counterweight attached to the rear end of the swivel, a mounting table provided on the vehicle for mounting the counterweight, and a counterweight mounted on the mounting table A counterweight attaching / detaching means for attaching / detaching to / from the rear end of the swivel base, a counterweight mounting state detector which is mounted on the counterweight and detects a mounting state of the counterweight and outputs a mounting signal, and the counterweight mounted on the swivel base side. A counterweight mounting state determining means for determining the mounting state of the counterweight in response to the mounting signal from the mounting state detector; a connection cord for connecting the counterweight mounting state detector and the counterweight mounting state determining means; and a connector. A counterweight is attached to the rear end of the swivel base using the counterweight attaching / detaching means. A counterweight attachment / detachment device for a mobile crane which connects the counterweight attachment state detector and the counterweight attachment state determination means with the connection cord and the connector when disconnected, and removes the connector when releasing the attachment of the counterweight. In
Connector connection state detection means for detecting a connection state of the connector; connector connection state determination means for receiving a detection signal from the connector connection state detection means and determining that the connector is in a connection state and outputting a connection state signal; And a counterweight attaching / detaching device for a mobile crane, comprising: an attachment / detachment restricting means for restricting attachment / detachment of the counterweight attaching / detaching means in response to the connection state signal. 3. The counterweight attaching / detaching means according to claim 1 or 2, wherein the counterweight attaching / detaching means is constituted by a hydraulic cylinder disposed between appropriate positions of the rear part of the swivel base and the counterweight, and the attaching / detaching restricting means at least restricts the extension of the hydraulic cylinder. A counterweight attaching / detaching device for a mobile crane. A swivel mounted on the vehicle so as to be capable of swiveling, a counterweight attached to the rear end of the swivel, a mounting table provided on the vehicle for mounting the counterweight, and a counterweight mounted on the mounting table A counterweight attaching / detaching means for attaching / detaching to / from the rear end of the swivel base, a counterweight mounting state detector which is mounted on the counterweight and detects a mounting state of the counterweight and outputs a mounting signal, and the counterweight mounted on the swivel base side. A counterweight mounting state determining means for determining the mounting state of the counterweight in response to the mounting signal from the mounting state detector; a connection cord for connecting the counterweight mounting state detector and the counterweight mounting state determining means; and a connector. A counterweight is attached to the rear end of the swivel base using the counterweight attaching / detaching means. A counterweight attachment / detachment device for a mobile crane which connects the counterweight attachment state detector and the counterweight attachment state determination means with the connection cord and the connector when disconnected, and removes the connector when releasing the attachment of the counterweight. In
The counterweight mounting state determining means determines that the connector is in a connected state when receiving a mounting signal from the counterweight mounting state detector, and outputs a connection state signal, and the counter is mounted on the mounting table. A placement detection means for detecting that a weight is placed and outputting a placement signal, a turn restriction when receiving a connection state signal from the counterweight mounting state determination means and a placement signal from the placement detection means A counterweight attaching / detaching device for a mobile crane, comprising: a turning drive determining means for outputting a signal; and a turning restricting means for restricting the turning drive of the swivel base in response to a turning restriction signal. A swivel mounted on the vehicle so as to be capable of swiveling, a counterweight attached to the rear end of the swivel, a mounting table provided on the vehicle for mounting the counterweight, and a counterweight mounted on the mounting table A counterweight attaching / detaching means for attaching / detaching to / from the rear end of the swivel base, a counterweight mounting state detector which is mounted on the counterweight and detects a mounting state of the counterweight and outputs a mounting signal, and the counterweight mounted on the swivel base side. A counterweight mounting state determining means for determining the mounting state of the counterweight in response to the mounting signal from the mounting state detector; a connection cord for connecting the counterweight mounting state detector and the counterweight mounting state determining means; and a connector. A counterweight is attached to the rear end of the swivel base using the counterweight attaching / detaching means. A counterweight attachment / detachment device for a mobile crane which connects the counterweight attachment state detector and the counterweight attachment state determination means with the connection cord and the connector when disconnected, and removes the connector when releasing the attachment of the counterweight. In
Connector connection state detecting means for detecting the connection state of the connector, and connector connection state determining means for receiving a detection signal from the connector connection state detecting means detecting means and determining that the connector is in a connected state and outputting a connection state signal A placement detection means for detecting that the counterweight is placed on the placement table and outputting a placement signal; a connection state signal from the connector connection state determination means; and a placement detection means from the placement detection means. A mobile crane comprising: a turning drive determining unit that outputs a turning restriction signal when receiving a placement signal; and a turning restriction unit that receives the turning restriction signal and restricts the turning drive of the swivel base. Counterweight attachment / detachment device. A swivel mounted on the vehicle so as to be capable of swiveling, a counterweight attached to the rear end of the swivel, a mounting table provided on the vehicle for mounting the counterweight, and a counterweight mounted on the mounting table A counterweight attaching / detaching means for attaching / detaching to / from the rear end of the swivel base, a counterweight mounting state detector which is mounted on the counterweight and detects a mounting state of the counterweight and outputs a mounting signal, and the counterweight mounted on the swivel base side. A counterweight mounting state determining means for determining the mounting state of the counterweight in response to the mounting signal from the mounting state detector; a connection cord for connecting the counterweight mounting state detector and the counterweight mounting state determining means; and a connector. A counterweight is attached to the rear end of the swivel base using the counterweight attaching / detaching means. A counterweight attachment / detachment device for a mobile crane which connects the counterweight attachment state detector and the counterweight attachment state determination means with the connection cord and the connector when disconnected, and removes the connector when releasing the attachment of the counterweight. In
Placement detecting means for detecting that the counterweight is placed on the mounting table and outputting a placement signal, and a turn restriction signal to the turn restriction means when receiving the placement signal. And a turning restriction means for restricting turning driving of the swivel base in response to the turning restriction signal, and the placement signal is input to the turning drive judgment means after passing through the connector. A counterweight attaching / detaching device for a mobile crane, characterized in that it is configured to do so. 6. The mobile crane according to claim 4 or 5, wherein the placement detection means comprises a placement detector disposed on the vehicle side that the counterweight is placed on the placement table. Counterweight attachment and detachment device. In any one of Claims 4 to 6, the above-mentioned position detecting means is characterized in that a counterweight is mounted on the mounting table, and is configured by a mounting detector disposed on the swivel table or counterweight side. Mobile crane counterweight attaching / detaching device. The counter weight attaching / detaching means according to any one of claims 4 to 6, wherein the counter weight attaching / detaching means is constituted by a hydraulic cylinder disposed between appropriate positions of the rear part of the swivel base and the counterweight. A counterweight attaching / detaching device for a mobile crane, characterized in that it comprises an extension detector that detects the fact that 10. The counter weight according to claim 1, wherein the counter weight includes a plurality of counter weights, and the counter weight mounting state detector is a detector capable of identifying a counter weight mounted in a plurality of counter weights. Counterweight attachment / detachment device for mobile cranes.

Images