JP5080051B2 - Roughing jib hanging load detector - Google Patents

Description

  The present invention relates to an apparatus for detecting a hanging load of a luffing jib.

  The luffing jib attached to the tip of the telescopic boom of the mobile crane is arranged on the back of the luffing jib main body and the back of the telescopic boom with the moment around the base end of the luffing jib main body generated by the weight of the luffing jib and the weight of the suspended load. It is structured to be supported by a tension device. That is, the hoisting cylinder of the telescopic boom does not support all of the moment generated by the self-weight and the suspended load of the telescopic boom and the luffing jib. Therefore, the hoisting cylinder holding pressure cannot be detected and the suspension load cannot be obtained from the holding pressure.

  As a luffing jib suspension load detection device, a suspension rope suspended from a luffing jib tip sheave is hung on a suspension hook, and the tip of the rope is connected to a load cell suspended from the luffing jib tip to directly detect the rope tension. And the suspension load detection apparatus which calculates suspension load from the said rope tension | tensile_strength and the number of ropes is known (for example, refer patent document 1).

  FIG. 8 is an explanatory diagram of a load detection unit of the suspension load detection device described in Patent Document 1. Reference numeral 41 denotes a sheave at the tip of the luffing jib, and reference numeral 42 denotes a hanging load hook. 24 is a suspended load rope, which is fed from a suspended load winch, is hung around a luffing jib tip sheave 41 and a suspended load sheave 43, and is then connected to a rope end 44. Reference numeral 45 denotes a load cell suspended from the leading end of the luffing jib, to which the rope end 44 is connected.

  Since the above-described suspension load detecting device detects the tension of the suspension load rope directly at the end of the rope, it has a feature that the accuracy of the detected load is very good. However, since the load cell 45 is suspended from the luffing jib tip and connected to the rope tip for hanging, there is a restriction that the number of ropes must be an even number, and there is a problem that it cannot be used for all luffing jibs. there were.

  FIG. 9 is an explanatory diagram of a load detection unit in a luffing jib hanging load detection device of another type described in Patent Document 1. A jib hoisting rope 22 fed from a jib hoisting winch 21 disposed on the swivel base 2 is reciprocally wound around an air sheave in the sky and a fixed sheave 25 connected to the base end portion of the boom 3. Reference numeral 26 denotes a rope end to which the end of the jib hoisting rope 22 is connected. Reference numeral 27 denotes a load cell to which the rope end 26 is connected. The load cell 26 is connected to a part of the support of the fixed sheave 25. This type of load detection device calculates the moment generated by the self-weight and suspension load of the luffing jib body from the tension of the jib hoisting rope 22 detected by the load cell, and subtracts the weight component of the luffing jib body from the moment. Thus, the moment for the suspension load is obtained, and the suspension load is obtained from the working radius of the luffing jib main body at that time.

  This suspension load detection method is effective in that there is no restriction that the number of hooks of the hanging load hook at the leading end of the luffing jib must be an even number, unlike the method of detecting at the end of the hanging load rope described above. . However, as described above, the entire moment including the moment component due to the weight of the luffing jib body having a very large weight is detected first, and the moment component due to the weight of the luffing jib body is subtracted in the subsequent calculation process. There was a problem that the accuracy of the suspended load calculated from the remaining moment was not high. In particular, the accuracy tends to decrease as the working radius by the luffing jib increases and the suspension load decreases.

  From the above problems, it was considered that a luffing jib suspending load detecting device is effective as a method for calculating the suspending load by detecting the tension at the intermediate portion of the suspending rope. For a long time, there has been known a method of detecting a force acting on an intermediate roller by arranging a three-point roller in an intermediate portion of a hanging load rope. However, this three-point roller method is not preferable in that the rope life is shortened because the rope is bent in the opposite direction. Therefore, the suspension load detection devices described in Patent Document 2 and Patent Document 3 described below have been proposed as those that do not have the risk of shortening the rope life and detect tension at the middle portion of the rope for suspension load. .

  FIG. 10 shows a tension detecting portion of a hanging load rope of the hanging load detecting device described in Patent Document 2. Links 4 and 5 are connected to brackets 4a and 5a fixed to the tip of the boom 1 by pins 2 and 3, respectively. A boom tip sheave 6 is rotatably supported at a position where the links 4 and 5 intersect. The suspended load rope 10 is hung around the guide sheave 7 and the boom tip sheave 6. A stress gauge 11 for detecting tension is attached to the link 4. The tension of the suspended load rope 10 is calculated from the tension signal detected by the stress gauge 11 and the boom angle signal detected by the angle detector 12 provided at the base of the boom 1.

On the other hand, FIG. 11 shows a tension detecting unit of a hanging load rope of the hanging load detecting device described in Patent Document 3. It comprises a guide sheave 31 provided at the tip of the boom 3, a boom tip sheave 32, and a tension detection sheave 33 provided between these sheaves. The tension detection sheave 33 is pivotally supported on the other end of the sheave support member 35 via a sheave support shaft 34. One end of the sheave support member 35 is connected to an attachment shaft 37 provided at the tip of the boom 3 and a load cell 36 is attached. The load cell 36 detects the reaction force of the tension detection sheave 33 by the suspended load rope 10. From this detection value, the tension of the suspended rope 10 is calculated.
Japanese Patent Laid-Open No. 11-139760 (page 2-3, FIG. 4, FIG. 6) Japanese Utility Model Publication No. 58-134389 (page 3-5, Fig. 2) JP 2001-89078 A (pages 7-8, FIG. 2)

  In the suspension load detection device described in Patent Document 2, it is necessary to use not only the axial force of the link but also the undulation angle of the boom in order to calculate the suspension load. there were. Further, the suspension load detection device described in Patent Document 3 has a problem that the entire device becomes complicated because a tension detection sheave is added.

  Therefore, the present invention detects tension at the middle part of the hanging rope, but it is not necessary to use the boom undulation angle, so it is easy to calculate the hanging load, and no additional tension detection sheave is required. Therefore, an object of the present invention is to provide a luffing jib suspension load detection device that is simple in its entirety.

A luffing jib suspension load detection device according to claim 1 of the present application includes a jib support detachably attached to a distal end portion of a telescopic boom whose base end portion is pivotably supported on a swivel base, and the jib support distal end portion. A luffing jib main body formed by connecting a plurality of divided jibs pivotally supported so that the base end portion thereof can be raised and lowered; A mast erected up and down, a jib tension member connecting the leading end of the luffing jib body and the mast tip, and a jib hoisting rope fed out from a jib hoisting winch disposed on the swivel It is hung between an aerial sheave suspended from the mast tip by a boom tension member and a fixed sheave arranged at the base end of the telescopic boom or swivel. And a jib undulation adjusting means configured to be connected to the fixed sheave, and a hanging winch arranged on the swivel base and suspended from the luffing jib main body guide sheave and connected to the hanging hook. Or a luffing jib comprising a hanging rope that is wound around and connected to the leading end of the luffing jib main body or the hanging load hook, and a mast guide sheave that is arranged on the mast and guides the hanging rope. In the suspension load detection device, the mast guide sheave arranged on the mast detects a force acting on the mast, and a suspension load calculation means calculates a suspension load from the guide sheave acting force. And .

In addition to the structure described in claim 1, the luffing jib suspension load detection device described in claim 2 of the present application includes a sheave support support in which the guide sheave acting force detection means rotatably supports the guide sheave. Slide support means disposed on the mast to slidably support the sheave support and a load cell interposed between the sheave support support and the mast to detect a force acting on the guide sheave. It is characterized by that.

  In the luffing jib suspension load detection device according to claim 3 of the present application, in addition to the configuration described in claim 1 or 2, the suspension load calculation means includes a guide sheave action from the guide sheave action force detection means. From the force signal and the jib body length detection means for detecting the length of the luffing jib body or the jib body length signal from the jib body length input means for manually inputting the length of the luffing jib body, the suspended rope tension is calculated. Rope tension from a rope tension calculation unit, a rope tension signal from the rope tension calculation unit and a rope multiplying number detecting means for detecting the number of hooks of the hanging hook, or a rope multiplying number input means for manually inputting the rope number A suspension load calculation unit for calculating a suspension load from the numerical signal.

In suspension load detecting apparatus for luffing jib according to claim 1, mast guide sheaves arranged on the mast, the force acting on the mast detected by the guide sheaves acting force detecting means, a load operation from the guide sheaves acting force Since the suspension load is calculated by the means, the undulation angle of the boom or the luffing jib does not affect the guide sheave acting force. Therefore, it is not necessary to use the boom or luffing jib undulation angle when calculating the suspension load, and the calculation of the suspension load is simplified. Moreover, mast guide sheaves for guiding the load rope hanging on mast luffing jib are usually arranged, suspension load detecting apparatus for luffing jib according to claim 1, tension detection sheave mast guide sheaves of their It is intended to be used as Therefore, it is not necessary to add a new tension detection sheave, and the entire suspension load detection device is simplified.

In suspension load detecting apparatus for luffing jib according to claim 2, the force acting on the mast guide sheaves in terms of supported slidably by a sliding support means a sheave supporting support arranged to the mast rotatably supporting the guide sheaves in the load cell to detect was interposed between the sheave supporting support and mast can guide sheaves together can detect the force acting on the mast guide sheaves for the mast regulated to a predetermined position. Therefore, the guide sheave does not shake during the luffing jib work or during the luffing jib disassembly and conveyance, and the guide sheave can be prevented from colliding with surrounding members and being damaged.

In the luffing jib suspension load detection device according to claim 3, since the suspension load calculation means includes a rope tension calculation unit, the rope tension calculation unit calculates from the guide sheave action force signal and the jib body length signal. The rope tension for suspended loads can be calculated. That is, since the length of the predetermined jib portion tension member are determined relative to the length of Rafinbujibu body, if luffing jib body length signal input angle of the mast against the Rafinbujibu body is determined. Therefore, if the luffing jib body length is determined, the relationship between the guide sheave acting force and the rope tension is expressed by a predetermined relationship, and the rope tension can be obtained from the guide sheave acting force. Further, since the suspension load calculation means includes a suspension load calculation unit, the suspension load calculation unit can calculate the suspension load from the rope tension and the number of ropes. That is, since the suspension load is several times the rope tension, the suspension load can be easily calculated.

  FIG. 1 shows an all-terrain crane 50 equipped with a luffing jib suspension load detection device according to the best mode for carrying out the present invention. The all terrain crane 50 has a swivel base 53 mounted on a vehicle section 52 with an outrigger 51 extended. The swivel base 53 is pivotally supported at the base end portion of the telescopic boom 54 so as to be freely raised and lowered. A hoisting cylinder 55 is interposed between the swivel base 53 and the telescopic boom 54, and the telescopic boom 54 is driven to hoist by the hoisting cylinder 55.

  Reference numeral 56 denotes a jib support that can be attached to and detached from the distal end of the telescopic boom 54. Reference numeral 57 denotes a luffing jib body, which is pivotally supported at the tip end portion of the jib support 56 so that its base end portion can be raised and lowered. The luffing jib main body 57 is configured by connecting a base end split jib 58 whose base end is connected to the tip of the jib support 56, an intermediate split jib 59 and a front split jib 60 whose connection number is selected as necessary. Has been. Reference numeral 61 denotes a first mast that is supported by the base end portion of the base end split jib 58 so that the base end portion of the base end split jib 58 can be raised and lowered along the luffing jib body 57. Reference numeral 62 denotes a second mast whose base end is pivotally supported in the vicinity of the base end of the first mast 61 and is erected along the roughing surface of the luffing jib main body 57. The second mast 62 is the first mast. It expands to a position closer to the telescopic boom 54 than the mast 61.

  Reference numeral 63 denotes a jib portion tension member that connects the tip of the tip split jib 60 and the tip of the first mast 61. The jib portion tension member 63 includes a base end split rod 64 having a length corresponding to the base end split jib 58, an intermediate split rod 65 having a length corresponding to the intermediate split jib 59, and a length corresponding to the tip split jib 60. The tip split rod 66 is connected. In this way, since the jib tension member 63 is connected to the split rod corresponding to the split jib length constituting the raffin bib jib body 57, the entire length of the jib tension member 63 is predetermined with respect to the length of the luffing jib main body 57. It has come to be a relationship. Reference numeral 69 denotes a mast tension member that connects the tip of the first mast 61 and the tip of the second mast 62, and is configured by connecting two rods.

Reference numeral 68 denotes a jib hoisting rope drawn out from a jib hoisting winch 67 disposed at the rear of the swivel base 53. The extended jib hoisting rope 68 is hung between an aerial sheave 71 suspended from the tip of the second mast 62 by a boom portion tension member 70 and a fixed sheave 72 disposed at the rear of the swivel base 53. The The tip of the jib hoisting rope 68 is connected to the fixed sheave 72. The above-described jib hoisting winch 67, jib hoisting rope 68, boom part tension member 70, aerial sheave 71, and fixed sheave 72 constitute the jib hoisting adjusting means 73 . The jib hoisting adjustment means 73 is configured such that the jib hoisting winch 67 pays out the jib hoisting rope 68, and changes the standing angle of the second mast 62 with respect to the telescopic boom 54, so Adjust the undulation angle.

  Reference numeral 75 denotes a suspended load rope fed from a suspended load winch 74 disposed at the rear of the swivel base 53. The suspended load rope 75 is suspended from two luffing jib body distal end guide sheaves 76 disposed at the distal end of the distal end split jib 60 via the second mast 62 and the first mast 61, and the distal ends thereof are suspended. It is connected to the hook 77 for use. FIG. 1 shows a single hanging hook 77, but the hanging hook 77 may be a multiple hanging hook with a built-in sheave. It is connected to the tip of the tip split jib 60 or the hanging load hook 77. That is, the number of ropes can be selected even or odd.

  Reference numeral 80 denotes a first mast guide sheave that guides the suspended load rope 75 disposed on the first mast 61. Reference numeral 81 denotes a second mast guide sheave for guiding the suspended load rope 75 disposed on the second mast 62.

FIG. 2 is an enlarged view of the periphery of the first mast 61 and the second mast 62 shown in FIG. The angle θ formed by the jib tip end portion 75a and the jib base end portion 75b of the first mast 61 of the suspended load rope 75 guided by the first mast guide sheave 80 is related to the undulation angle of the telescopic boom 54. It is constant. In addition, the angle θ of the hanging rope 75 in the first mast guide sheave 80 portion is constant regardless of the undulation angle of the luffing jib main body 57 with respect to the telescopic boom 54. From this, it can be seen that the force acting on the first mast guide sheave 80 by the hanging rope 75 is constant regardless of the undulation angle of the telescopic boom 54 and the undulation angle of the luffing jib body 57 . Therefore, the luffing jib suspension load detecting device according to the present invention detects the force acting on the first mast guide sheave 80, so that it is not necessary to use the boom 54 luffing angle or the luffing jib elevation angle in calculating the suspension load. Therefore, the calculation of the suspension load is simplified.

FIG. 3 is a detailed view taken along arrow A in FIG. FIG. 4 is a detailed sectional view taken along the line BB in FIG. FIG. 5 is a detailed cross-sectional view taken along the line CC of FIG. Hereinafter, the guide sheave acting force detection means 100 that detects the force acting on the first mast guide sheave 80 will be described with reference to FIGS. 3 to 5. As shown in FIG. 3, the first mast 61 is configured by two mast members 82 a and 82 b being arranged substantially in parallel in the left-right direction and having their distal ends connected by a distal end member 83.

  Reference numeral 84 shown in FIG. 4 denotes a sheave support that rotatably supports the first mast guide sheave 80. The sheave support support 84 is configured by combining two vertically long plates arranged close to the center of the first mast guide sheave 80. A pin 85 is disposed through the center portion of the sheave support support 84, and the pin 85 serves as a support shaft of the first guide sheave 80. As shown in FIG. 4, four rollers 86 are arranged on one side surface of the sheave support support 84 so as to be rotatable at positions that are symmetrical vertically and horizontally. In addition, two slide plates 87 are arranged on the sheave support support 84 above and below the roller 86. As shown in FIG. 3, the roller 86 and the slide plate 87 are similarly arranged on the opposite surface of the slide sheave support 84 so as to be symmetrical about the first mast guide sheave 80.

  As shown in FIG. 4, the slide sheave support 84 is connected at its upper portion by a load cell 88 and a pin 89. The load cell 88 is connected to the tip member 83 of the first mast 61 via a pin 90, a cross joint 91 and a pin 92. By being connected in this way, the load cell 88 is interposed between the sheave support support 84 and the first mast 61 and detects a force acting on the first mast guide sheave 80. Note that the load cell 88 is interposed between the sheave support support 84 and the first mast 61 so that a compressive load acts on the load cell 88, and the compressive load is detected as a force acting on the first mast guide sheave 80. Of course it is good.

  Reference numeral 93 denotes a guide member for guiding the sheave support support 84. As shown in FIG. 4, the guide member 93 is attached to a support 96 and a support 97 welded to the first mast 61 with bolts. As shown in FIG. 5, the guide member 93 is configured such that a pair of vertically long members whose sections are bent into a hat shape surround the sheave support support 84. The rollers 86 of the sheave support support 84 are guided by contacting and rotating the inner surfaces 93a on both sides of the guide member 93 orthogonal to the first guide sheave 80. Further, the slide plate 87 of the sheave support support 84 is guided by contacting and sliding on the inner surface 93 b of the guide member 93 parallel to the first guide sheave 80. The roller 86, the slide plate 87, and the guide member 93 constitute a slide support means. As shown in FIG. 4, the sheave support support 84 is slidably supported along the slide shaft 94 that is slightly inclined with respect to the first mast 61 by the slide support means.

Detection by guide sheaves acting force detecting means 100 described above is done as follows. As shown in FIG. 1, a tension T is generated in the suspended load rope 75 by the load W of the suspended load 95 suspended from the leading end of the luffing jib main body 57. Also in the vicinity of the first mast guide sheave 80 at that time, as shown in FIG. 4, a tension T is generated in the hanging rope 75 toward the jib distal end side 75a and the jib proximal end side 75b. The angle formed between the jib tip-side hanging rope 75a and the slide shaft 94 of the first guide sheave 80 is θ1, and the angle formed between the jib proximal-end loading rope 75b and the slide shaft 94 of the first guide sheave 80 is θ2. Assuming that the force acting on the first mast guide sheave 80 is F, the following relationship is established.
F = TCOSθ1 + TCOSθ2
Therefore, the tension T can be obtained by the following equation when the acting force F is measured.
T = F / (COSθ1 + COSθ2)
The tension can be obtained with higher accuracy in consideration of the sheave efficiency when the suspended load rope 75 passes through the sheave.

FIG. 6 is a view showing another embodiment relating to the guide sheave acting force detecting means. Reference numeral 98 denotes a sheave support that rotatably supports the first mast guide sheave 80. The slide support means for slidably supporting the sheave support support 98 is omitted. As a result, the central axis 99 of the sheave support support 98 is positioned on the bisector of the angle formed by the jib tip end suspension rope 75a and the jib proximal end suspension rope 75b. Therefore, the tension T is T = F / 2COSθ3
It becomes.

FIG. 7 is a block diagram of a luffing jib suspension load detection device according to an embodiment of the present invention . The guide sheave acting force detection means 100 detects the force acting on the first mast guide sheave , and specifically corresponds to the load cell 88 described above. Reference numeral 101 denotes a jib body length detection means for detecting the length of the luffing jib body 59. Instead of the jib body length detection means 101, a jib body length input means for manually inputting the luffing jib body length may be used. Reference numeral 102 denotes a suspension load calculation means, which includes a rope tension calculation unit 103 and a suspension load calculation unit 104 therein. A rope sheave action force F signal is input from the guide sheave action force detector 100 to the rope tension calculator 103, and a luffing jib body length signal is input from the jib body length detector 101. The rope tension calculation unit 103 calculates the rope tension T based on the relationship between the rope tension T and the guide sheave acting force F described above.

  Reference numeral 105 denotes a rope hook number detecting means for detecting the rope hook number of the hanging load hook 77. Instead of the rope multiplication number detecting means 105, rope multiplication number input means for manually inputting the rope multiplication number may be used. A rope tension signal is input from the rope tension calculator 103 to the suspension load calculator 104 and a rope multiplier signal is input from the rope multiplier detector 105. The suspension load calculation unit 104 calculates the suspension load W from both signals, and the calculated suspension load W signal is input to the overload prevention device main body 106 provided in the all terrain crane 50 and used for overload prevention control. .

It is the mobile crane 50 carrying the luffing jib suspension load detection apparatus which concerns on this invention. It is the figure which expanded and showed the periphery of the 1st mast 61 and the 2nd mast 62. It is A arrow detailed drawing of FIG. FIG. 4 is a detailed sectional view taken along the line B-B in FIG. 3. It is CC sectional detail drawing of FIG. It is the figure which showed other embodiment regarding a guide sheave action force detection means. 1 is a block diagram of a luffing jib suspension load detection device according to an embodiment of the present invention. It is a load detection part of the suspension load detection apparatus described in patent document 1. FIG. It is the load detection part in the hanging load detection apparatus of the luffing jib of another type described in patent documents 1. The tension detection part of the rope for suspension loads of the suspension load detection apparatus described in patent document 2 is shown. The tension detection part of the rope for suspension loads of the suspension load detection apparatus described in patent document 3 is shown.

Explanation of symbols

53: swivel 54: telescopic boom 56: jib support 57: luffing jib body 61: first mast 62: second mast 63: jib tensioning member 67: jib hoisting winch 68: jib hoisting rope 69: mast tensioning member 71: Aerial sheave 72: Fixed sheave 73: Jib undulation adjusting means 74: Suspended load winch 75: Suspended load rope 76: Roughing jib body tip guide sheave 77: Suspended load hook 80: First mast guide sheave 81: Second Mast guide sheave 84: Sheave support support 88: Load cell 100: Guide sheave acting force detection means 101: Jib body length detection means 102: Suspension load calculation means 103: Rope tension calculation section 104: Suspension load calculation section 105: Rope multiplier Detection means

Claims (3)

A jib support detachably attached to the distal end of a telescopic boom whose base end is pivotally supported on a swivel base, and a plurality of divided jibs whose base end is pivotally supported on the tip of the jib support. A luffing jib main body, a mast that is pivotally supported by the base end of the jib support or the luffing jib, and that stands up and down along the roughing surface of the luffing jib main body, and the leading end of the luffing jib main body and the mast A jib tension member that connects the tip, and an aerial sheave in which a jib hoisting rope fed from a jib hoisting winch arranged on the swivel base is suspended from the mast tip by a boom tension member. A jib undulation adjusting means constructed by being hung between a boom base end or a fixed sheave arranged on the swivel base and having its tip connected to the fixed sheave. , The being from the turning suspended load winch disposed platform feeding the luffing jib body tip suspended from the guide sheaves Do is connected to the suspended load hook or over wound its tip luffing jib body tip or the suspended load hook a suspended load rope which is connected, in suspended load detection device of the luffing jib having a mast guide sheaves for guiding the load-suspending ropes being placed on the mast,
The mast guide sheave arranged on the mast includes a guide sheave action force detecting means for detecting a force acting on the mast, and a suspension load calculating means for calculating a suspension load from the guide sheave action force. A luffing jib hanging load detector. The guide sheave acting force detecting means includes a sheave support support that rotatably supports a guide sheave, slide support means that is disposed on the mast and supports the sheave support support in a slidable manner, and the sheave support support and the mast . The suspension load detecting device for a raffin vibib according to claim 1, further comprising a load cell that is interposed between the load cell and detects a force acting on the guide sheave. The suspension load calculating means manually inputs the guide sheave acting force signal from the guide sheave acting force detecting means and the length of the luffing jib body, or the jib body length for manually inputting the luffing jib body length. Rope tension calculator that calculates the rope tension for the suspended load from the jib body length signal from the input means, and the rope tension that detects the rope tension signal from the rope tension calculator and the number of hooks for the hook for the suspended load The suspension load calculating part which calculates a suspension load from the rope multiplication signal from the rope multiplication input means which inputs a detection means or a rope multiplication manually is provided, It is characterized by the above-mentioned. Roughing jib hanging load detection device.

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