JP5569344B2 - Counterweight weight detection device - Google Patents

Description

  The present invention relates to a counterweight weight detection apparatus.

  2. Description of the Related Art Conventionally, in a mobile crane such as a crawler crane, a counterweight is loaded on a rear portion of an upper swing body that is rotatably mounted on a lower traveling body. A plurality of counterweights are prepared, and the total weight of the counterweights is adjusted by stacking an appropriate number of counterweights at the rear of the upper swing body. Since the crane's suspension capacity varies depending on the load weight of the counterweight, it is necessary to acquire the load weight data of the counterweight. For this reason, conventionally, various techniques for acquiring counter loading weight data have been implemented.

  For example, after an operator performs a work of stacking a plurality of counterweights on the rear part of the upper swing body and fixing the counterweights to each other, the number of stacked counterweights is input at the terminal, and the input is made. The loading weight of the counterweight is calculated based on the data.

  However, in this case, if the operator makes an incorrect input, there is a possibility that an incorrect loading weight is required.

  Conventionally, a connector is connected to each counter weight, and after loading the counter weight, the connector connected to the counter weight is connected to the connector of the detection device, thereby connecting the detection device to the connector. Based on the number of counterweights, the number of stacked counterweights is detected, and the weight of the counterweight is calculated from the detection result.

  However, in this case, it is necessary to perform connector connection work for each stage of the counterweight, and the connection work becomes complicated.

  Therefore, in order to solve the problems of the conventional technology as described above, a detection device that automatically calculates the loading weight of the counterweight by simply loading the counterweight on the rear portion of the upper swing body is disclosed in Patent Document 1 below. Has been proposed.

  The detection device proposed in Patent Document 1 includes a plurality of proximity switches provided on the rear legs of a frame that supports a boom via a wire rope in an upper swing body of a crane. In this detection device, each time the counterweight is loaded on the rear part of the upper swing body, the corresponding proximity switch detects the loading of the counterweight, and the number of stacked counterweights is determined based on the detection data of the proximity switch. At the same time, the total weight of the counterweight is calculated.

JP-A-8-217382

  However, in the technique described in Patent Document 1, it is necessary to provide a number of proximity switches corresponding to the number of counterweights that may be loaded on the upper swing body, which causes a problem that the number of parts increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to automatically acquire the load weight of the counterweight as the counterweight is fixed while preventing an increase in the number of parts. It is an object of the present invention to provide a counterweight weight detection device that can perform the above-described operation.

  In order to achieve the above object, an invention according to claim 1 is provided in a crane including an upper swing body and a plurality of counterweights stacked on a rear portion of the upper swing body. A counterweight weight detection device for detecting a total weight of the counterweights stacked on the rear part, and penetrating in a stacking direction of the counterweight stack composed of a plurality of counterweights stacked on the rear part of the upper swing body. And a first fastening member having an abutting portion that comes into contact with an end surface on one side of the counterweight laminate in the stacking direction, and the first fastening member on the other side of the counterweight laminate in the stacking direction. By doing so, the second fastening member that fastens the counterweights stacked with the contact portion in the stacking direction; An information acquisition unit that is provided in the intermediate weight laminate and obtains information on the height of the counterweight laminate in the stacking direction; and a height of the counterweight laminate in the stacking direction that is provided in the first fastening member. An information providing unit that provides information regarding the information acquisition unit, and a weight deriving unit that obtains the weight of the counterweight laminate based on information about the height of the counterweight laminate acquired by the information acquisition unit. It is characterized by.

  According to the first aspect of the present invention, it is only necessary to stack counterweights on the rear part of the upper swing body and fix the counterweights to each other with the first fastening member and the second fastening member. It is possible to automatically obtain the loading weight of the counterweights stacked on the surface.

  Specifically, in the first aspect of the present invention, when the counterweights are stacked on the rear portion of the upper swing body and the counterweights are fixed to each other by the first fastening member and the second fastening member, Information on the height of the counterweight laminate is automatically given from the information imparting unit provided on the one fastening member to the information acquisition unit provided on the counterweight laminate, and the counterweight laminate obtained by the information acquisition unit is obtained. Based on the information on the height, the weight deriving unit obtains the weight of the counterweight laminate. As a result, the loading weight of the counterweight is automatically acquired with the work of fixing the counterweight stacked on the rear part of the upper swing body.

  In the first aspect of the present invention, since the information providing unit provided on the first fastening member gives information on the height of the counterweight laminate to the information acquisition unit provided on the counterweight laminate, Information on the height of the counterweight laminate can be acquired by one information acquisition unit. Since the weight deriving unit can determine the weight of the counterweight laminate from the information regarding the height of the counterweight laminate acquired by the one information acquisition unit, the counter of each stage to be stacked as in the past The total loading weight of the counter weight can be obtained without separately providing detection devices corresponding to the weights and detecting the number of stacked counter weights with these detection devices.

  Therefore, according to the first aspect of the present invention, it is possible to automatically acquire the loaded weight of the counterweight with the work of fixing the counterweight while preventing the number of parts from increasing.

  According to a second aspect of the present invention, in the counterweight weight detection device according to the first aspect, the first fastening member has a length corresponding to a plurality of heights of the counterweight stack in the stacking direction. A plurality of first fastening members, wherein the information providing unit is provided in each of the first fastening members, and the information providing unit is provided as information on the height of the counterweight laminate. Information on the length of one fastening member is given to the information acquisition unit.

  The length of the first fastening member that penetrates the counterweight stack in the stacking direction corresponds to the height of the counterweight stack. For this reason, as in the invention described in claim 2, the information providing section provided in each first fastening member having a length corresponding to various heights of the counterweight laminate is provided with the information providing section. If information on the length of the first fastening member is given to the information acquisition unit, the information on the length of the first fastening member given to the information acquisition unit is used as information on the height of the counterweight laminate, and the weight is derived. The part can determine the weight of the counterweight laminate. That is, according to the present invention, a specific configuration can be obtained in which the information acquisition unit acquires information about the height of the counterweight stack, and the weight deriving unit obtains the weight of the counterweight stack from the information.

  The counterweight weight detection device according to a third aspect is the counterweight weight detection device according to the first or second aspect, wherein the information giving unit is the first fastening member provided with the information giving unit. It has a display part which is arranged in the above-mentioned contact part, and displays information about the height of the above-mentioned counterweight laminated body, and the above-mentioned information acquisition part is the above-mentioned display part among the above-mentioned one end face of the above-mentioned counterweight laminated body And a reading device that reads information related to the height of the counterweight laminate displayed by the display unit.

  According to the third aspect of the present invention, the reading device provided on the end face on the one side of the counterweight laminate is the first fastening member regardless of the height in the stacking direction of the counterweight laminate. Information on the height of the counterweight laminate can be read from a display portion provided in a portion protruding from the through hole to the one side of the counterweight laminate.

  According to a fourth aspect of the present invention, in the counterweight weight detection device according to the first aspect, the first fastening member is inserted into a through hole provided in the counterweight stacked body so as to penetrate in the stacking direction. The information imparting part is inserted from one side, and passes through the position of the end face on the one side of the counterweight laminate among the first fastening members as information on the height of the counterweight laminate. The information acquisition unit is provided with information on the length of the portion inserted into the information acquisition unit.

  The length of the portion of the first fastening member that passes through the position of the one end face of the counterweight laminate and is inserted into the through hole corresponds to the height of the counterweight laminate. For this reason, as in the invention according to claim 4, the information providing portion is a portion of the first fastening member that passes through the position of the one end face of the counterweight laminate and is inserted into the through hole. If information about the length is given to the information acquisition unit, the weight deriving unit can determine the weight of the counterweight laminate using the information given to the information acquisition unit as information about the height of the counterweight laminate. That is, according to the present invention, a specific configuration can be obtained in which the information acquisition unit acquires information about the height of the counterweight stack, and the weight deriving unit obtains the weight of the counterweight stack from the information.

  According to a fifth aspect of the invention, in the counterweight weight detection device according to the fourth aspect of the invention, the information imparting portion extends along a direction of insertion in a portion of the first fastening member that is inserted into the through hole. The information acquisition unit is provided on the one end face of the counterweight laminate, and the first fastening member of the plurality of signs is the through hole. And a detection device that detects a marker that passes through the position of the end surface on the one side of the counterweight laminate when inserted from the one side.

  According to the fifth aspect of the present invention, the detection device provided on the end surface on the one side of the counterweight laminate is attached to the first fastening member regardless of the height of the counterweight laminate in the stacking direction. Detecting a sign passing through the position of the end face on one side of the counterweight laminate when the first fastening member is inserted into the through hole of the counterweight laminate from the one side among the plurality of provided signs Can do.

  The invention according to claim 6 is the counterweight weight detection device according to claim 5, wherein the indicator detected by the detection device when the first fastening member is inserted into the through hole from the one side. It is characterized by including a calculation part which calculates the number of the above.

  According to the sixth aspect of the present invention, the number of signs detected by the detection device when the first fastening member is inserted from one side into the through-hole of the counterweight laminate is calculated. From the number, it is possible to obtain information on the length of the portion of the first fastening member inserted into the through hole, that is, information on the height of the counterweight laminate.

  As described above, according to the present invention, there is provided a counterweight weight detection device capable of automatically acquiring the loaded weight of the counterweight in accordance with the work of fixing the counterweight while preventing an increase in the number of parts. Can be provided.

1 is a schematic side view of a crawler crane on which a counterweight weight detection device according to a first embodiment of the present invention is mounted. It is a functional block diagram which shows the structure of the overload prevention apparatus which determines the implementation or non-execution of a crane work using the loading weight of the counterweight calculated | required by the counterweight weight detection apparatus by 1st Embodiment. It is the figure which looked at the counterweight laminated body from back. It is a perspective view of the upper part of the top counterweight. It is sectional drawing along the VV line of the counterweight laminated body shown in FIG. It is a figure which expands and shows the part of the head of the volt | bolt which comprises the 1st fastening member in FIG. 5, and the information acquisition part vicinity. It is a front view of the bolt of the 1st fastening member which constitutes the counterweight weight detection device by a 1st embodiment. It is a figure which expands and shows the part of the head vicinity of the volt | bolt of the 1st fastening member by 1st Embodiment. The flowchart which shows the deriving process of the load weight of the counterweight by the counterweight weight detection apparatus of 1st Embodiment, and the process in which an overload prevention apparatus determines the implementation permission of a crane operation | work and the implementation non-permission using the derived load weight. It is. It is a perspective view of the upper part of the uppermost counterweight of the crane with which the counterweight weight detection apparatus by 2nd Embodiment was applied. It is a figure corresponding to FIG. 6 in the counterweight provided with the counterweight weight detection apparatus by 2nd Embodiment. It is a front view of the bolt of the 1st fastening member which comprises the counterweight weight detection apparatus by 2nd Embodiment. It is a functional block diagram which shows the structure of the overload prevention apparatus which determines the implementation or non-execution of a crane work using the loading weight of the counterweight calculated | required by the counterweight weight detection apparatus by 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, the configuration of the counterweight weight detection apparatus 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  The counterweight weight detection apparatus 1 according to the present embodiment is provided, for example, in a crawler crane 100 as shown in FIG. The crawler crane 100 includes a crawler type lower traveling body 102, an upper revolving body 104 that is rotatably mounted on the lower traveling body 102, and a plurality of counterweights 106 that are loaded on the rear portion of the upper revolving body 104. And an overload prevention device 108 (see FIG. 2).

  The upper swing body 104 is provided with a boom 110 that can be raised and lowered, and a suspended load is suspended from the tip of the boom 110 by a hook device 112 via a hook rope 111. The hook rope 111 is wound or fed out by an unillustrated hoisting winch mounted on the upper swing body 104, whereby the suspended load is raised or lowered. Further, one end of the guy cable 114 is connected to the tip of the boom 110, and the upper spreader 115 is connected to the other end of the guy cable 114. A gantry 116 is erected on the rear part of the upper swing body 104, and a lower spreader 117 is provided on the top of the gantry 116. A boom hoisting rope 118 is hung between the unillustrated sheave of the lower spreader 117 and the unillustrated sheave of the upper spreader 115. Then, the boom hoisting rope 118 is wound or unwound by a boom hoisting winch (not shown) mounted on the upper swing body 104, so that the distance between the spreaders 115, 117 is expanded and reduced, and the boom 110 is hoisted. It has come to be.

  The counterweight 106 is stacked on the rear part of the upper swing body 104 and is for balancing the suspension load by the boom 110 to ensure the stability of the crane 100 body. A plurality of counterweights 106 stacked on the rear part of the upper swing body 104 constitute a counterweight stack 106a. The suspension capacity of the crane 100 varies depending on the loading weight of the counterweight 106 loaded on the rear part of the upper swing body 104. The uppermost counterweight 106b, which is the uppermost counterweight 106 among the multiple stages of counterweights 106 stacked on the rear part of the upper swing body 104, has been determined, and the number of stacked counterweights 106 may be changed. Even when the combination of stacks of the counterweights 106 is changed, the determined uppermost counterweight 106b is always stacked on the uppermost side.

  As shown in FIG. 3, the uppermost counter weight 106b and the counter weight 106 arranged one stage below are arranged separately on the left and right, and each counter weight 106 on the lower stage is composed of one piece. ing. The uppermost counterweight 106b and the counterweight 106 one level below have the same height. The uppermost counterweight 106b and the counterweights 106 below the counterweight 106 one level below have the same height, and the height is equal to that of the uppermost counterweight 106b and one stage below. It is smaller than the height of the counterweight 106.

  Each of the left and right upper counterweights 106b is provided with a through hole 106c (see FIG. 5) at a position near the center of the uppermost counterweight 106b as viewed from above. The through hole 106c penetrates the uppermost counterweight 106b in the height direction (vertical direction). Further, each counter weight 106 stacked below the uppermost counterweight 106b is provided with a through hole 106c penetrating in the height direction (vertical direction) at a position corresponding to the through hole 106c of the uppermost counterweight 106b. ing. That is, in a state where the counterweights 106 are stacked, the positions of the through holes 106c of all the counterweights 106 are matched, and the through holes 106c of the counterweights 106 communicate from the top to the bottom. Thereby, the through-hole 106d which penetrates the counterweight laminated body 106a in the whole area | region of the lamination direction is formed.

  The overload prevention device 108 is a device for preventing the crane 110 from being overturned due to an excessive suspension load applied to the boom 110. As shown in FIG. 2, the overload prevention device 108 includes a controller 120, which outputs a work stop signal to the hoisting winch hydraulic drive unit 122 and the boom hoisting winch hydraulic drive unit 124. Accordingly, the hydraulic drive units 122 and 124 are stopped to drive and the crane operation cannot be performed. On the other hand, by releasing the output of the work stop signal, the hydraulic drive units 122 and 124 can be driven to perform the crane operation. Can be implemented. The controller 120 includes a calculation unit 120a that performs various calculations, and a storage unit 8 that stores various data, setting values, and the like. The storage unit 8 is also used as a storage unit of the counterweight weight detection apparatus 1 of the present embodiment.

  The counterweight weight detection apparatus 1 according to the present embodiment is provided in the crane 100 as described above, and detects the total weight (loading weight) of the counterweight 106 stacked on the rear part of the upper swing body 104. .

  Specifically, the counterweight weight detection device 1 includes a first fastening member 2a, a second fastening member 2b, an information providing unit 4, an information acquisition unit 6, a storage unit 8 (see FIG. 2), A weight deriving unit 10 (see FIG. 2).

  The first fastening member 2a and the second fastening member 2b are for fastening a plurality of counterweights 106 stacked on the rear part of the upper swing body 104 to each other in the stacking direction (vertical direction).

  Specifically, the 1st fastening member 2a penetrates the counterweight laminated body 106a in the lamination direction (up-down direction). The first fastening member 2a is a bolt inserted from above into a through hole 106d provided in the counterweight laminate 106a, and penetrates the counterweight laminate 106a in the laminating direction by insertion into the through hole 106d. .

  As shown in FIG. 7, the bolt constituting the first fastening member 2a has an insertion part 2d, a head part 2e, a handle part 2f, and a screw part 2g.

  The insertion part 2d is a part that is inserted from above into the through hole 106d of the counterweight laminate 106a, and is formed in a round bar shape extending in one direction. The insertion portion 2d has a length substantially equal to the height of the counterweight laminate 106a in the stacking direction.

  The head portion 2e is provided at one end portion (upper end portion) in the axial direction of the insertion portion 2d, and is formed so that a cross section perpendicular to the axial direction of the insertion portion 2d is rectangular. This head 2e is included in the concept of the contact portion of the present invention, and when the insertion portion 2d is inserted through the through hole 106d of the counterweight laminate 106a, one of the counterweight laminates 106a in the stacking direction. Abuts the upper surface (the upper surface of the uppermost counterweight 106b), which is the end surface of the side. Further, the head 2e is disposed so as to protrude from the upper surface of the counterweight laminate 106a as shown in FIGS. 4 to 6 in a state where the insertion portion 2d is inserted into the through hole 106d of the counterweight laminate 106a. .

  The handle portion 2f is erected on the upper surface of the head portion 2e, and is a portion that is gripped when the bolt insertion portion 2d is inserted into the through hole 106d of the counterweight laminate 106a.

  The screw portion 2g is provided at the other end portion (lower end portion) of the insertion portion 2d in the axial direction. Since the insertion portion 2d has a length substantially equal to the height of the counterweight laminate 106a, when the insertion portion 2d is inserted from above into the through hole 106d of the counterweight laminate 106a, the screw portion 2g is It protrudes from the lower surface of the counterweight laminate 106a.

  The second fastening member 2b is coupled to the first fastening member 2a on the lower side of the counterweight laminate 106a, thereby fastening the counterweights 106 laminated with the head 2e in the laminating direction. Specifically, the second fastening member 2b is a nut that engages with the screw portion 2g below the counterweight laminate 106a, and is screwed into the screw portion 2g to be tightened. 106 is fastened in the stacking direction.

  In the first embodiment, a plurality of bolts having lengths respectively corresponding to a plurality of types of heights of the counterweight laminate 106a in the stacking direction are prepared as the bolts constituting the first fastening member 2a. ing. That is, if the number of the counterweights 106 is different, the height of the counterweight laminate 106a is different. Therefore, the bolt length (insertion) of the first fastening member 2a necessary for fastening the laminated counterweight 106 is different. The length of the portion 2d) is different. For this reason, even if the stack height of the counterweight 106 changes, the bolt having the insertion portion 2d having a length substantially equal to each stack height is first fastened so that the stacked counterweight 106 can be fastened. It is prepared as a member 2a. The operator selects a bolt having an appropriate length for fastening the counterweight 106 according to the height of the counterweight stack 106a.

  The information giving unit 4 gives the information acquisition unit 6 information about the height of the counterweight laminate 106a in the stacking direction. In the first embodiment, the information providing unit 4 is provided on each first fastening member 2a having a length corresponding to each of a plurality of types of heights of the counterweight stack 106a, and the counterweight in the stacking direction is provided. As information regarding the height of the laminated body 106a, information regarding the axial length of the bolt of the first fastening member 2a provided with the information providing unit 4 (hereinafter referred to as bolt length information) is provided to the information providing unit 4. give. And this information provision part 4 consists of the display part 4a (refer FIG. 8) which displays the length information of the said bolt as information regarding the height of the counterweight laminated body 106a. This display part 4a consists of a barcode, and is arrange | positioned by one side surface among the four side surfaces of the bolt head part 2e of the 1st fastening member 2a. When the bolt of the first fastening member 2a is inserted through the through hole 106d of the counterweight laminate 106a, the side surface of the head 2e to which the bar code of the display unit 4a is attached is opposed to the reading device 6a described later. Arranged to face each other.

  The information acquisition part 6 acquires the information regarding the height of the counterweight laminated body 106a which the information provision part 4 gives, ie, the length information of the bolt of the 1st fastening member 2a. This information acquisition unit 6 is attached to the head 2e of the bolt when the bolt of the first fastening member 2a is inserted into the through hole 106c on the upper surface of the counterweight laminate 106a (upper surface of the uppermost counterweight 106b). The reading unit 6a is provided at a position where the bar code of the display unit 4a can be detected. The reading device 6a reads the length information of the bolt of the first fastening member 2a displayed by the bar code of the display unit 4a, and is a reader 6b comprising a bar code reading sensor for reading the bar code of the display unit 4a. (See FIG. 6) and a holder 6c for holding the reader 6b.

  The holder 6c is provided at a position adjacent to the through hole 106d in the upper surface of the counterweight laminate 106a (upper surface of the uppermost counterweight 106b), and information on the head 2e among the bolts inserted through the through hole 106d. The reader 6b is held so that the detector 6d of the reader 6b that reads the barcode faces the side surface to which the applying unit 4 is attached.

  The reader 6b transmits information read from the barcode of the display unit 4a to the weight deriving unit 10.

  As shown in FIG. 2, the storage unit 8 is incorporated in the controller 120 of the overload prevention device 108, and the weight data of the counterweight laminate 106a corresponding to the bolt length information of the first fastening member 2a. Is stored in the data table. Specifically, since the height of the counterweight laminate 106a and the length of the bolt used for fastening the counterweight laminate 106a change for each number of the laminate of the counterweight 106, the number of laminates of the counterweight 106, The relationship between the total load weight of the counter weight 106 and the bolt length necessary for fastening the counter weight 106 is examined in advance, and the length information of the bolt to be used and the load weight of the counter weight 106 are associated with each other. A data table is created. The created data table is stored in the storage unit 8 in advance.

  The weight deriving unit 10 is incorporated in the calculation unit 120a of the controller 120 of the overload prevention device 108. The weight deriving unit 10 obtains the weight of the counterweight laminate 106a based on the information about the height of the counterweight laminate 106a acquired by the information acquisition unit 6, that is, the length information of the bolt read by the reader 6b. . Specifically, the weight deriving unit 10 derives the weight of the counterweight laminate 106 a corresponding to the bolt length information transmitted from the reader 6 b from the data table stored in the storage unit 8.

  Next, referring to the flowchart shown in FIG. 9, an overload prevention device 108 using the derivation process of the load weight of the counterweight 106 by the counterweight weight detection device 1 of the first embodiment and the detected load weight. A process for determining whether or not to permit the crane operation of the crane 100 will be described.

  First, the operator stacks the counterweight 106 on the rear portion of the upper swing body 104, selects the bolt of the first fastening member 2a having a length corresponding to the stacking height, and inserts the bolt insertion portion 2d into the counterweight. The through-hole 106d of the laminated body 106a is inserted from above. At this time, the bolt insertion portion 2d is inserted into the through hole 106d so that the barcode of the display portion 4a attached to the bolt head 2e faces the detection portion 6d of the reader 6b. Then, the laminated counterweight 106 is fastened in the laminating direction by screwing the nut of the second fastening member 2b into the screw portion 2g of the bolt protruding from the lower surface of the counterweight laminated body 106a and tightening the nut. . In addition, the controller 120 of the overload prevention device 108 outputs a work stop signal, and the crane 100 is in a state where the crane work cannot be performed.

  When the counterweight 106 is fastened (fixed) with the bolts and nuts, the information acquisition unit 6 acquires information on the height of the counterweight laminate 106a provided by the information providing unit 4 (step S1). . Specifically, the reader 6b of the information acquisition unit 6 detects the barcode of the display unit 4a attached to the bolt head 2e and reads the length information of the bolt displayed by the barcode. Then, the reader 6 b transmits the read information to the weight deriving unit 10.

  Next, the weight deriving unit 10 derives the loading weight of the counterweight 106 from the data table stored in the storage unit 8 based on the information transmitted from the reader 6b (step S3). In this manner, the weight of the counterweight 106 stacked on the rear part of the upper swing body 104 is derived by the counterweight weight detection device 1 of the first embodiment.

  Next, the operator inputs a code from a terminal (not shown), and the calculation unit 120a of the overload prevention device 108 obtains the set load weight of the counter weight 106 from the type of the counter weight 106 and the set load number included in the code ( Step S5).

  Next, the controller 120 of the overload prevention device 108 determines the actual loaded weight of the counterweight 106 (the loaded weight derived in step S3) and the set loaded weight of the counterweight 106 (the loaded weight determined in step S5). It is determined whether or not they are equal (step S7).

  Here, if the controller 120 determines that the actual load weight of the counterweight 106 is equal to the set load weight, the controller 120 cancels the output of the work stop signal (step S9). Thereby, in the crane 100, execution of the crane work is permitted, the hoisting winch hydraulic drive part 122 and the boom hoisting winch hydraulic drive part 124 can be driven, and the crane work can be executed.

  On the other hand, if the controller 120 determines in step S7 that the actual load weight of the counterweight 106 is not equal to the set load weight, the actual load weight of the counterweight 106 does not match the set load weight. This is displayed on the display device 126 (see FIG. 2) installed in the cab 119 of the upper swing body 104 to notify the operator (step S11), and the output of the work stop signal is maintained (step S13). In this case, the crane operation by the crane 100 is not permitted and the crane operation cannot be performed.

  As described above, the counterweight weight detection device 1 derives the loading weight of the counterweight 106 and the overload prevention device 108 uses the derived loading weight to determine whether to permit or prohibit the crane work. Is called.

  As described above, in the first embodiment, the counter weights 106 are stacked on the rear part of the upper swing body 104, and the counter weights 106 are fixed by the first fastening member 2a and the second fastening member 2b. The counterweight laminate 106a is transferred from the display unit 4a of the information applying unit 4 provided on the bolt head 2e of the first fastening member 2a to the reader 6b of the information acquisition unit 6 provided on the upper surface of the counterweight laminate 106a. Information (bolt length information) is automatically given, and the weight deriving unit 10 obtains the weight of the counterweight laminate 106a based on the information acquired by the information acquiring unit 6. As a result, the loading weight of the counterweight 106 is automatically acquired with the fixing work of the counterweight 106 stacked on the rear part of the upper swing body 104.

  Moreover, in this 1st Embodiment, the information provision part 4 provided in the head part 2e of the volt | bolt of the 1st fastening member 2a is countered to the reader 6b of the information acquisition part 6 provided in the upper surface of the counterweight laminated body 106a. In order to give information (bolt length information) about the height of the weight laminate 106a, it is possible to obtain information about the height of the counterweight laminate 106a with one information acquisition unit 6. Since the weight deriving unit 10 can determine the weight of the counterweight laminate 106a from the information acquired by the one information acquisition unit 6, the detection corresponding to the counterweight of each layer to be stacked as in the conventional case. The total load weight of the counterweight 106 can be obtained without providing individual devices and detecting the number of stacked counterweights with these detection devices.

  Therefore, according to the first embodiment, it is possible to automatically acquire the loaded weight of the counterweight 106 with the fixing work of the counterweight 106 while preventing the number of parts from increasing.

  Moreover, in this 1st Embodiment, the display part 4a of the information provision part 4 is provided in the head 2e which protrudes from the upper surface of the counterweight laminated body 106a among the bolts of the 1st fastening member 2a, and reading of the information acquisition part 6 is carried out. Since the device 6a is provided at a position where the display unit 4a can be detected on the upper surface of the counterweight laminate 106a, the reader 6b of the reader 6a can be used regardless of the height of the counterweight laminate 106a in the stacking direction. Information on the height of the counterweight laminate 106a (bolt length information) can be read from the display unit 4a.

(Second Embodiment)
Next, with reference to FIGS. 10-13, the structure of the counterweight weight detection apparatus 1 by 2nd Embodiment of this invention is demonstrated.

  In the counterweight weight detection device 1 of the second embodiment, unlike the first embodiment, the information providing unit 14 uses the counterweight of the bolts of the first fastening member 2a as information on the height of the counterweight stack 106a. Information on the length of the portion (insertion portion 2d) that passes through the position of the upper surface of the laminated body 106a and is inserted into the through hole 106d is given to the information acquisition unit 16.

  Specifically, the information providing unit 14 includes a plurality of markers 14a (see FIG. 12) that are disposed in the insertion portion 2d of the first fastening member 2a at regular intervals along the insertion direction into the through hole 106d. Consists of. Each mark 14a is composed of a recess formed on the outer surface of the insertion portion 2d. The concave portions are provided at regular intervals along the longitudinal direction (axial direction) of the insertion portion 2d. Also in the second embodiment, a plurality of bolts having lengths respectively corresponding to a plurality of types of heights in the stacking direction of the counterweight stack 106a are prepared as the first fastening member 2a. Each bolt insertion portion 2d is provided with a different number of the markings 14a (recesses).

  The information acquisition unit 16 (see FIGS. 10 and 11) is configured to use a counterweight when the insertion portion 2d is inserted into the through hole 106d from the upper side among the plurality of markers 14a provided in the insertion portion 2d of the first fastening member 2a. It comprises a detection device 16a for detecting a marker 14a that passes through the position of the upper surface of the laminate 106a. The detection device 16a is provided at the same position as the position where the reading device 6a of the first embodiment is provided on the upper surface of the counterweight laminate 106a.

  As shown in FIG. 11, the detection device 16a includes a detector 16b including a proximity sensor, and a holder 6c that holds the detector 16b. When the insertion part 2d of the bolt of the first fastening member 2a is inserted into the through hole 106d of the counterweight laminate 106a, the detector 16b has a posture capable of detecting the marker 14a provided on the insertion part 2d. Is held in. In other words, the insertion part 2d is inserted into the through hole 106d so that the surface provided with the marker 14a faces the detection part 16d of the detector 16b.

  The detector 16b outputs an ON signal to the calculation unit 20 described later only when the distance between the detection unit 16d of the detector 16b and the surface of the bolt insertion portion 2d is less than a certain distance. That is, the detector 16b outputs an ON signal to the calculation unit 20 when the surface of the insertion unit 2d other than the recess is opposed to the detection unit 16d, and the detection unit 16d has the recess. When facing each other, the output of the signal is stopped.

  In the second embodiment, the counterweight weight detection device 1 determines the number of the markers 14a detected by the detector 16b when the insertion portion 2d of the first fastening member 2a is inserted from above into the through hole 106d. A calculating unit 20 (see FIG. 13) for calculating is provided. The calculation unit 20 is incorporated in the calculation unit 120 a of the controller 120 of the overload prevention device 108. The calculating unit 20 calculates the number of labels 14a detected by the detector 16b by measuring the number of ON signals sent from the detector 16b. Since the number of markers 14a (concave portions) provided in the insertion portion 2d differs depending on the length of the bolt insertion portion 2d, the length of the insertion portion 2d is calculated by calculating the number of markers 14a detected by the detector 16b. Information about can be obtained.

  And in this 2nd Embodiment, the data table which shows the correlation with the number of the label | markers 14a which the detector 16b detects, and the weight of the counterweight laminated body 106a is produced beforehand, and is memorize | stored in the memory | storage part 8, and is weighted. The deriving unit 10 obtains the weight of the counter weight laminate 106a from this data table based on the number of detections of the marker 14a by the detector 16b calculated by the calculating unit 20.

  The other configuration of the counterweight weight detection apparatus 1 according to the second embodiment is the same as that of the counterweight weight detection apparatus 1 according to the first embodiment.

  As described above, in the second embodiment, the bolt of the first fastening member 2a is inserted into the through hole 106d of the counterweight laminate 106a in order to fix the counterweight 106 laminated on the rear portion of the upper swing body 104. In this case, a plurality of markers 14a provided on the bolt insertion part 2d are transferred to the detector 16b of the information acquisition part 16 provided on the upper surface of the counterweight laminate 106a, that is, information on the length of the bolt insertion part 2d. In order to provide information on the height of the weight laminate 106a, the information on the height of the counterweight laminate 106a is obtained by one information acquisition unit 16, and the weight deriving unit 10 determines the weight of the counterweight laminate 106a from the information. Can be requested. For this reason, also in the second embodiment, as in the first embodiment, it is possible to automatically acquire the loaded weight of the counterweight 106 as the counterweight 106 is fixed while preventing an increase in the number of parts. it can.

  Further, in the second embodiment, the plurality of markers 14a of the information providing unit 14 are provided in the insertion portion 2d of the first fastening member 2a, and the information acquisition unit 16 detection device 16a is provided on the upper surface of the counterweight laminate 106a. Therefore, the detecting device 16a has the insertion portion 2d out of the plurality of marks 14a provided in the insertion portion 2d regardless of the height in the stacking direction of the counterweight laminate 106a. It is possible to detect the mark 14a passing through the position of the upper surface of the counterweight laminate 106a when being inserted into the upper side 106d.

  The effects of the second embodiment other than those described above are the same as the effects of the first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

  For example, the first fastening member is not limited to a bolt. For example, the first fastening member may be a pin inserted through a through hole of the counterweight laminate. Then, an information providing unit that provides the information acquisition unit with length information of the pin is provided at a portion of the pin protruding from the upper surface of the counterweight laminate, or the pin is inserted into a through hole of the counterweight laminate. A plurality of markers constituting the information providing unit may be provided at intervals along the length direction.

  Moreover, if the display part provided in the part which protrudes from the upper surface of a counterweight laminated body among 1st fastening members can display the information (length information of a 1st fastening member) regarding the height of a counterweight laminated body. It is not limited to barcodes. And as a reader which reads the information which the display part displays, what can read the information which the display part displays according to the form of a display part is used.

  Further, the bolt of the first fastening member may be inserted into the through hole of the counterweight laminate from below, and the nut of the second fastening member may be screwed onto the screw portion of the bolt on the upper side of the counterweight laminate. . In this case, the reader or detector of the information acquisition unit is provided on the lower surface of the counterweight stack. The same counter weight is always used as the lowermost counter weight provided with the reading device or the detection device.

  Further, the bolt used as the first fastening member is not limited to a bolt with a head. That is, you may use as a 1st fastening member what screwed the nut as a contact part of this invention to the bolt without a head.

  In the second embodiment, a nut as a contact portion of the present invention is screwed to a bolt having a length larger than the maximum stacking height of the counterweight and having a thread groove formed in the entire longitudinal direction thereof. You may use a thing as a 1st fastening member. In this case, by changing the position of the nut as the contact portion in the length direction of the bolt according to the height of the counterweight laminate, the height of the counterweight laminate (the number of counterweights laminated) is Even if it changes, the insertion part of the length corresponding to the lamination height can be formed with one 1st fastening member. That is, according to this configuration, all the heights of the counterweight laminate can be accommodated with one first fastening member.

  Moreover, the marker which comprises the information provision part provided in the insertion part of a 1st fastening member is not limited to the above recessed parts.

  Moreover, the crane to which the counterweight weight detection apparatus of the present invention is applied is not limited to a crawler crane. As long as the crane is loaded with a counterweight, the counterweight weight detection device of the present invention can be applied to any crane.

DESCRIPTION OF SYMBOLS 1 Counterweight weight detection apparatus 2a 1st fastening member 2b 2nd fastening member 2e Head (contact part)
4, 14 Information adding unit 4a Display unit 6, 16 Information acquisition unit 6a Reading device 10 Weight deriving unit 14a Marking 16a Detection device 20 Calculation unit 100 Crane 104 Upper turning body 106 Counterweight 106a Counterweight laminate 106d Through hole

Claims (6)

A counterweight weight that is provided on a crane including an upper swing body and a plurality of counterweights stacked on the rear part of the upper swing body and detects the total weight of the counterweight stacked on the rear part of the upper swing body A detection device,
A contact portion that penetrates in the stacking direction the counterweight stack composed of the plurality of counterweights stacked at the rear of the upper swing body and contacts the end surface on one side of the counterweight stack in the stacking direction; A first fastening member having
A second fastening member that fastens the counterweights stacked with the contact portion in the stacking direction by coupling with the first fastening member on the other side of the counterweight stack in the stacking direction. When,
An information acquisition unit that is provided in the counterweight stack and acquires information about the height of the counterweight stack in the stacking direction;
An information providing unit that is provided on the first fastening member and that provides the information acquisition unit with information on the height of the counterweight laminate in the stacking direction;
A counterweight weight detection device, comprising: a weight deriving unit that obtains the weight of the counterweight laminate based on information about the height of the counterweight laminate acquired by the information acquisition unit. As the first fastening member, comprising a plurality of first fastening members having lengths respectively corresponding to a plurality of heights of the counterweight laminate in the laminating direction,
The information providing unit is provided in each of the first fastening members, and acquires information on the length of the first fastening member provided with the information providing unit as information on the height of the counterweight laminate. The counterweight weight detection device according to claim 1, which is provided to the section. The information providing unit includes a display unit that is disposed on the contact portion of the first fastening member provided with the information providing unit and displays information on the height of the counterweight laminate.
The information acquisition unit is provided at a position where the display unit can be detected on the one end face of the counterweight laminate, and reads information related to the height of the counterweight laminate displayed by the display unit. The counterweight weight detection device according to claim 1, comprising a device. The first fastening member is inserted from the one side into a through hole provided to penetrate the counterweight laminate in the laminating direction,
The information imparting portion is a portion of the first fastening member that passes through the position of the one end face of the counterweight laminate as information on the height of the counterweight laminate, and is inserted into the through hole. The counterweight weight detection apparatus according to claim 1, wherein information on a length is given to the information acquisition unit. The information providing unit is composed of a plurality of signs disposed at intervals along the insertion direction in a portion of the first fastening member that is inserted into the through hole.
The information acquisition unit is provided on the one end face of the counterweight laminate, and the counterweight laminate is formed when the first fastening member of the plurality of markers is inserted into the through hole from the one side. The counterweight weight detection device according to claim 4, further comprising a detection device that detects a sign that passes through the position of the one end face of the body.   The counterweight weight detection device according to claim 5, further comprising a calculation unit that calculates the number of the markers detected by the detection device when the first fastening member is inserted into the through hole from the one side. .

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