Current collector

Abstract

To provide a current collecting device capable of shortening the time required for starting operation under low temperature environment such as a cold district.SOLUTION: A current collecting device includes a cable reel 20 which is stored in a housing 10 and which is a rotation member relatively rotatable to the housing 10, a slip ring 30 mounted on the cable reel 20 to be stored in the housing 10 so as to rotate together with the cable reel 20, a brush 40 fixed to and stored in the housing 10 to be brought into contact with the slip ring 30, and an ice-accretion prevention member 50 stored in the housing 10 to be brought into contact with the slip ring 30 at a position different from that of the brush 40.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a current collecting device in which brushes rotate while in contact with slip rings inside a housing. [Background technology]

[0002] Cranes such as vehicle-mounted cranes are equipped with a boom length detection device that detects the length of the extending and retracting boom, and a moment limiter that prevents the crane from tipping over during work. The moment limiter uses the boom length detected by the boom length detection device to calculate the working radius of the crane and performs control to prevent the crane from tipping over during work. The boom length detection device includes a cable reel around which a cable is wound and a cable formed using electric wires in order to detect the extended length of the boom. The electric wires forming the cable are used to transmit a signal indicating the length of the cable, as well as to transmit a signal outputting a load signal from a load cell that detects the mass of a suspended load, and to supply power to sensors attached to the tip of the boom.

[0003] To transmit signals and supply power, a current collector equipped with a slip ring that rotates with the cable reel and a brush that is in constant contact with the slip ring is disposed inside the boom length detection device. The brush functions as a connector for transmitting signals and a connector for supplying power to the sensors. Therefore, communication transmission and power supply are continuous even when the cable reel is continuously rotating. Incidentally, when a crane is used outdoors in extremely cold climates, the temperature may drop below -20°C during the night (late at night) when the crane is stopped, and the crane is placed in a low-temperature environment. Therefore, humid air accumulates around the slip ring during the day, and when the sun goes down and the temperature drops, the humid air causes condensation on the surface of the slip ring. Furthermore, when the temperature drops below 0°C, the condensation on the surface of the slip ring turns into ice and covers the surface of the slip ring.

[0004] Furthermore, if the crane is used in a low-temperature environment, such as outdoors, while the ice covering the surface of the slip ring has not melted, the rotating brushes may run over the ice covering the surface of the slip ring, disrupting communication transmission and power supply, and causing the crane to malfunction. One technique for preventing malfunctions in cold regions is disclosed in Patent Document 1, in which heaters are attached to the electrical components and electrical equipment of a crane and the heaters are turned on before the crane is used to ensure stable operation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Russian Patent No. 2523870 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the technology disclosed in Patent Document 1, since it takes time for the ice covering the surface of the slip ring to melt, a sufficient amount of time is required for warming up the crane before it can be used. Therefore, the time required for warming up the crane may cause a problem that it becomes difficult to start work promptly.

[0007] In view of the above-mentioned problems, an object of the present invention is to provide a current collecting device that can shorten the time required to start operation in a low-temperature environment such as a cold region. [Means for solving the problem]

[0008] A current collecting device according to one aspect of the present invention includes a rotating member, a slip ring, a brush, and an anti-icing member. The rotating member is housed in a housing and is rotatable relative to the housing. The slip ring is attached to the rotating member and housed in the housing and rotates together with the rotating member. The brush is fixed to and housed in the housing and contacts the slip ring. The anti-icing member is housed in the housing so as to contact the slip ring at a position different from that of the brush. Effect of the Invention

[0009] According to the present invention, it is possible to provide a current collecting device that can shorten the time required to start operation in a low-temperature environment such as a cold region. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a left side view of a crane-mounted vehicle equipped with a current collector. [Diagram 2] FIG. 1 is a perspective view of a crane equipped with a boom length detection device. [Diagram 3] FIG. 2 is an exploded perspective view showing the configuration of a boom length detection device. [Figure 4] FIG. 2 is a diagram showing a configuration of a meter side housing. [Diagram 5] 4A and 4B are diagrams illustrating a configuration of a pressing member. [Figure 6] 4A and 4B are diagrams showing the configuration of an anti-icing member and a pressing member. [Figure 7] FIG. 13 is a diagram showing a configuration of a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, a crane-mounted vehicle, which is one embodiment of a work vehicle equipped with a current collector according to the present invention, will be described with reference to the drawings as appropriate. Note that the drawings are schematic. Therefore, it should be noted that the relationship and ratio between thickness and planar dimensions may differ from the actual ones, and there may be parts in which the relationship and ratio of dimensions differ between the drawings. In addition, the embodiments shown below are examples of devices and methods for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components to the embodiments described below.

[0012] (Embodiment) (composition) As shown in FIG. 1, a crane-mounted vehicle 100 equipped with a current collector includes a platform 101, a cab 102, a chassis frame 103, and a crane 200. In the embodiment, as shown in FIG. 1, the case where the crane-mounted vehicle 100 is a truck will be described. In the following description and drawings, the direction in which the crane-mounted vehicle 100 moves forward (the direction in which the vehicle travels with the shift selected in D range or the like) may be described as "forward". Similarly, in the following description and drawings, the direction in which the crane-mounted vehicle 100 moves backward (the direction in which the vehicle travels with the shift selected in R range) may be described as "rear". In the following description and drawings, the "left side" refers to the left side of the driver driving the crane-mounted vehicle 100, and the "right side" refers to the right side of the driver driving the crane-mounted vehicle 100. Therefore, in the following description and drawings, the "left side view" refers to the viewpoint of the driver driving the crane-mounted vehicle 100 as seen from the left side, and the "right side view" refers to the viewpoint of the driver driving the crane-mounted vehicle 100 as seen from the right side.

[0013] On the loading platform 101, for example, loads (building materials, etc.) to be suspended by a crane 200 are placed. The operator's cab 102 is where the operator of the crane-equipped vehicle 100 sits. The chassis frame 103 forms the skeleton of the crane-equipped vehicle 100. The crane 200 is mounted on the chassis frame 103 . The crane 200 also includes a base 201, a column 202, a boom 203, a hook 204, and various actuators (not shown). The base 201 is formed in a rectangular cylindrical shape and is provided with outriggers 205 . The column 202 is rotatably mounted on the base 201 . The boom 203 is a telescopic multi-stage boom (multi-stage telescopic boom) and is attached to the upper end of the column 202 so as to be able to rise and fall freely.

[0014] The base end of the wire rope 206 is wound around a winch (not shown) provided on the column 202. The tip end of the wire rope 206 is hung on a pulley (not shown) in the hook 204 and fixed to the tip of the boom 203. As a result, the hook 204 is suspended from the tip of the boom 203. The various actuators include actuators for rotating the column 202 (boom 203), raising and lowering the boom 203, hoisting and lowering the hook 204 by a winch, and extending and retracting the outriggers 205. The various actuators are operated by being individually supplied with pressurized oil via control valves from a hydraulic pump that is driven by being connected to the power take-off (PTO) of the engine provided in the crane-mounted vehicle 100.

[0015] The boom 203, which is a multi-stage telescopic boom, is, for example, a three-stage boom having a multi-stage nested structure as shown in FIG. The boom 203 also includes a base boom 203a, an intermediate boom 203b, and a tip boom 203c. The base boom 203 a forms the base end of the boom 203 and is attached to the column 202 . The intermediate boom 203b is housed in the base boom 203a so as to be extendable and retractable. The tip boom 203c is housed in the intermediate boom 203b so as to be extendable and retractable.

[0016] As shown in FIG. 2, the boom 203 is equipped with a boom length detection device 300. The boom length detection device 300 includes a current collector 1, a cable (detection cord) 2, and a potentiometer 3. As shown in FIG. 3, the current collector 1 includes a housing 10, a cable reel 20, a plurality of slip rings 30, a plurality of brushes 40, an anti-icing member 50, and a pressing member 60.

[0017] (Housing) The housing 10 is attached to a plate-like member forming the tip boom 203c inside the tip boom 203c. For the sake of explanation, in Fig. 2, the tip boom 203c is partially cut away to show the housing 10 disposed inside the tip boom 203c. The housing 10 is formed by combining a drum side housing 11 and a meter side housing 12. The drum side housing 11 has a reel accommodating portion 11a and a drum side flange portion 11b. The reel housing portion 11a is formed in a cylindrical shape with one end closed. The drum side flange portion 11b is continuous with the open end (the other end) of the reel accommodating portion 11a and is formed in a circular ring shape. The outer diameter (diameter) of the drum side flange portion 11b is larger than the outer diameter (diameter) of the reel accommodating portion 11a.

[0018] As shown in FIGS. 3 and 4, the meter side housing 12 has a meter accommodating portion 12a, a meter side flange portion 12b, and a protruding shaft portion 12c. The meter housing portion 12a is formed in a cylindrical shape with one end closed. Furthermore, a signal line 4 connected to sensors (not shown) arranged on the tip boom 203c protrudes from the side surface of the meter housing portion 12a. Note that the signal line 4 is not shown in FIG.

[0019] The meter side flange portion 12b is continuous with the opening end (the other end) of the meter accommodating portion 12a and is formed in an annular shape. The outer diameter (diameter) of the meter side flange portion 12b is, for example, the same as the outer diameter of the drum side flange portion 11b and is larger than the outer diameter (diameter) of the reel accommodating portion 11a. Thus, when the meter side flange portion 12b and the drum side flange portion 11b are coaxially combined, the opening end of the meter accommodating portion 12a and the opening end of the reel accommodating portion 11a are disposed inside the housing 10. The protruding shaft portion 12c is formed in a cylindrical shape, is continuous with the open end of the meter accommodating portion 12a, and is disposed inside the meter side flange portion 12b. Furthermore, protruding claws 12d are formed at three locations on the outer circumferential surface of the protruding shaft portion 12c. The three protruding claws 12d are formed in a block shape protruding from the outer circumferential surface of the protruding shaft portion 12c, and are arranged, for example, at equal intervals.

[0020] (Cable reel) The cable reel 20 forms a rotating member that is rotatable relative to the housing 10, and has a cable reel drum 21 and a drum rotation shaft 22. The cable reel drum 21 is formed in a cylindrical shape, and is rotatably disposed inside the reel accommodating portion 11a. The cable 2 is wound from the base end side around the outer circumferential surface (not shown) of the cable reel drum 21. That is, the rotating member includes the cable reel 20 around which the cable 2 is wound. The cable reel drum 21 also has a built-in spring (not shown), such as a coil spring, and the cable 2 is automatically wound onto the cable reel drum 21 by the elastic force of the spring when it is not receiving a pulling force. The drum rotation shaft 22 is formed in a cylindrical shape fixed to the cable reel drum 21, and protrudes from the center of the surface of the cable reel drum 21 that faces the meter side housing 12. Moreover, the drum rotation shaft 22 is inserted into a gap formed in the protruding shaft portion 12c.

[0021] (Slip ring) The plurality of slip rings 30 are formed in an annular shape. Each slip ring 30 is attached to the cable reel 20 and accommodated in the housing 10, and rotates together with the cable reel 20. In the embodiment, as shown in FIG. 3, a case will be described in which three slip rings 30a to 30c having different diameters are housed inside the housing 10. The three slip rings 30a to 30c are arranged coaxially with gaps between them. Moreover, the slip ring 30 rotates together with the cable reel 20 coaxially with the cable reel 20. That is, the rotation axis of the slip ring 30 is coaxial with the rotation axis of the cable reel 20.

[0022] (Brush) The brush 40 is attached to the meter side housing 12 and housed in the housing 10 , and is in contact with the slip ring 30 . The surface of the slip ring 30 with which the brush 40 comes into contact (the surface facing the meter side housing 12) is plated. In this embodiment, a case will be described in which the plating is nickel plating.

[0023] In the embodiment, a case will be described in which three brushes 40a to 40c are housed inside the housing 10 as shown in FIG. The three brushes 40a to 40c are arranged at positions where they do not interfere with one another. As shown in Fig. 4, each brush 40 has a mounting portion 41, two arms 42, two contact portions 43, and two mounting seats 44. In Fig. 4, for ease of viewing, the mounting portion 41, arms 42, contact portions 43, and mounting seats 44 are attached to only brush 40b among the three brushes 40a to 40c.

[0024] The mounting portion 41 is formed in a flat plate shape and is attached to the surface of the meter side housing 12 facing the slip ring 30 using a mounting screw 45 electrically connected to a terminal (not shown) of the signal line 4. Each of the arms 42 is made of, for example, spring steel and has elasticity. Each of the arms 42 is formed in a rectangular plate shape. One end of the arm portion 42 is continuous with two opposing locations on the mounting portion 41, sandwiching the mounting screw 45 therebetween. The other end of the arm portion 42 extends in a direction away from the mounting portion 41 as it extends from the meter side housing 12 toward the slip ring 30. As a result, each arm portion 42 is inclined with respect to the thickness direction of the mounting portion 41 when viewed from the radial direction of the slip ring 30.

[0025] Each contact portion 43 is attached to the tip (other end) of the arm portion 42 . In addition, each contact portion 43 is constantly pressed against the slip ring 30 by the elastic force of the arm portion 42 . Each mounting seat portion 44 is formed in a position of the mounting portion 41 such that a mounting screw 45 is sandwiched therebetween. The mounting seat portion 44 is formed in a block shape and protrudes toward the side closer to the slip ring 30 than the mounting portion 41 .

[0026] (Anti-icing materials) The anti-icing member 50 is formed by combining a plurality of arc-shaped members. The multiple members forming the anti-icing member 50 are housed in the housing 10 and arranged so as to come into contact with the slip ring 30 at positions different from the brushes 40 . Specifically, the portion of the anti-icing member 50 that faces the slip ring 30 is in close contact with the entire surface of the slip ring 30. In other words, the anti-icing member 50 is disposed so as to be in close contact with the slip ring 30 throughout, and is housed in the housing 10. As a result, the anti-icing member 50 is in contact with the slip ring 30 so as to cover the entire slip ring 30.

[0027] Moreover, the anti-icing member 50 is formed with a porous structure. Furthermore, the anti-icing member 50 has moisture absorbing properties. In the embodiment, the anti-icing member 50 is formed using felt, which is a nonwoven fabric with a porous structure, and the anti-icing member 50 is configured in a porous structure and a hygroscopic structure. The thickness of the anti-icing member 50 in the no-load state is greater than the distance between the slip ring 30 and the portion of the housing 10 that faces the slip ring 30. In other words, the thickness of the anti-icing member 50 in the no-load state is greater than the thickness of the anti-icing member 50 when it is disposed between the slip ring 30 and the portion of the housing 10 that faces the slip ring 30. In FIG. 3, the axial direction of the rotation shaft of the slip ring 30 is indicated by a double-headed arrow.

[0028] Here, the "unloaded state" refers to, for example, a state in which the anti-icing member 50 is not housed in the housing 10 and no external force is applied to the anti-icing member 50. In addition, the "thickness of the anti-icing member 50 in the unloaded state" is specifically the "length of the anti-icing member 50 along the axial direction of the rotation shaft of the slip ring 30 in the unloaded state." Moreover, "the portion of the housing 10 facing the slip ring 30" refers to the portion of the housing 10 facing the slip ring 30 along the axial direction of the rotation shaft of the slip ring 30. Furthermore, "the distance between the portion of the housing 10 facing the slip ring 30 and the slip ring 30" refers to the distance along the axial direction of the rotation shaft of the slip ring 30 between the portion of the housing 10 facing the slip ring 30 and the slip ring 30. Therefore, when the anti-icing member 50 is housed in the housing 10, it goes from an unloaded state to a loaded state, generating a restoring force to the unloaded state, and is constantly pressed against the slip ring 30.

[0029] (Holding member) The pressing member 60 is formed in a disk shape, and is housed in the housing 10 with the anti-icing member 50 sandwiched between the pressing member 60 and the slip ring 30 . As shown in FIG. 5, the pressing member 60 has a rotary shaft through hole 61, a rotary shaft rim portion 62, a plurality of protruding shaft insertion portions 63, a plurality of brush through holes 64, and a plurality of claw portions 65. The rotary shaft through hole 61 is a hole that passes through the center of the pressing member 60, and is formed at a position where the drum rotary shaft 22 is inserted. The rotating shaft rim portion 62 is formed in a cylindrical shape protruding from the surface of the pressing member 60 facing the meter side housing 12, and is continuous with the inner surface of the rotating shaft through hole 61 on the surface of the pressing member 60 facing the meter side housing 12.

[0030] The multiple protruding shaft insertion portions 63 are recesses formed continuously with the inner peripheral surface of the rotating shaft rim portion 62, and are formed into a shape into which the protruding claws 12d can be inserted. The multiple protruding shaft insertion portions 63 are also arranged at positions into which the three protruding claws 12d can be inserted. Therefore, the pressing member 60 has the protruding shaft insertion portions 63 in three places. The brush through-holes 64 are formed in positions and shapes that allow the brushes 40 to pass through. In the embodiment, as shown in Fig. 3 etc., a case will be described in which the pressing member 60 has six brush through-holes 64. A total of six arm portions 42 and contact portions 43 of the three brushes 40a to 40c pass through the six brush through-holes 64.

[0031] Each of the claw portions 65 is formed on a surface of the pressing member 60 facing the meter side housing 12. Also, each of the claw portions 65 protrudes from the surface of the pressing member 60 facing the meter side housing 12. In the embodiment, as shown in Fig. 5 etc., a case will be described in which the pressing member 60 has two sets of claw portions 65, for a total of four. Moreover, the two claw portions 65 forming one set are formed at positions sandwiching one mounting seat portion 44. In Fig. 4, the positions where a total of four claw portions 65 sandwich two mounting seats 44 therebetween are indicated by dashed lines and marked with the symbol HP.

[0032] In addition, the position where the two claw portions 65 forming a set sandwich one mounting seat portion 44 therebetween is arranged at a position along the circumferential direction of the drum rotation shaft 22 inserted into the gap portion of the protruding shaft portion 12c. Therefore, the retaining member 60 is fixed to the meter side housing 12 by inserting the three protruding claws 12d into the three protruding shaft insertion portions 63, respectively, and by the four claw portions 65 each sandwiching the two mounting seat portions 44 between them. Here, the thickness of the anti-icing member 50 in the no-load state is greater than the distance between the slip ring 30 and the pressing member 60. In other words, the thickness of the anti-icing member 50 in the no-load state is greater than the thickness of the anti-icing member 50 when it is disposed between the slip ring 30 and the pressing member 60. Here, "the distance between the slip ring 30 and the pressing member 60" refers to "the distance between the slip ring 30 and the pressing member 60 along the axial direction of the rotation shaft of the slip ring 30."

[0033] Furthermore, the sum of the thickness of the anti-icing member 50 and the thickness of the pressing member 60 in the no-load state is greater than the distance between the slip ring 30 and the portion of the housing 10 that faces the slip ring 30. In other words, the sum of the thickness of the anti-icing member 50 and the pressing member 60 in the no-load state is greater than the sum of the thickness of the anti-icing member 50 and the pressing member 60 when the anti-icing member 50 is disposed between the slip ring 30 and the portion of the housing 10 that faces the slip ring 30. It should be noted that "the thickness of the pressing member 60" refers to "the length of the pressing member 60 parallel to the rotation axis of the slip ring 30."

[0034] Therefore, the anti-icing member 50 housed in the housing 10 is always pressed against the slip ring 30 by the pressing member 60. Furthermore, the anti-icing member 50 housed in the housing 10 in a state where it is pressed against the slip ring 30 by the pressing member 60 is always pressed against the slip ring 30 by a restoring force to a no-load state. 6, the anti-icing member 50 is fixed to the surface of the pressing member 60 facing the slip ring 30 by using an adhesive or the like. Therefore, the anti-icing member 50 is fixed to the pressing member 60.

[0035] (cable) The cable 2 is formed using an electric wire, and is accommodated inside the reel accommodating portion 11a so as to be capable of being unwound and wound. The tip of the cable 2 is fixed inside the base end boom 203a.

[0036] (Potentiometer) The potentiometer 3 is built in the meter housing 12a, and has a structure in which a resistor is arranged inside, forming a rotation angle detector. A signal output by the potentiometer 3 is input to a controller (not shown) via a cable 2. Although the potentiometer 3 is built in the housing 10, in FIG. 2, a reference symbol is attached to the position in the housing 10 where the potentiometer 3 is built for the sake of explanation. Similarly, in other drawings, a reference symbol may be attached to the position in the housing 10 where the potentiometer 3 is built. In addition, the potentiometer 3 is connected to the drum rotation shaft 22 . Therefore, when the boom 203 expands and contracts and the cable 2 is unwound or reeled out, causing the cable reel drum 21 and the drum rotation shaft 22 to rotate, the resistance value of the resistor disposed inside the potentiometer 3 changes. Then, a signal corresponding to the changed resistance value is input to the controller via the cable 2.

[0037] (controller) The controller calculates the length of cable 2 reeled out from housing 10 (the length of boom 203) based on a signal input from potentiometer 3, in accordance with a predetermined control program including a program for calculating the length of boom 203. Then, the controller outputs the calculated length of boom 203 to a moment limiter (not shown). The moment limiter calculates the working radius of crane 200 using the length of boom 203 detected by boom length detection device 300, and performs control to prevent crane 200 from tipping over during work.

[0038] <Operation> The operation of the embodiment will be described with reference to FIGS. When the crane 200 is used in a low-temperature environment, for example, during the day when the temperature does not drop below freezing, even if humid air is accumulating around the slip ring 30 inside the housing 10, condensation is suppressed from occurring on the slip ring 30. However, in a low-temperature environment, when the sun goes down and the temperature drops, a situation occurs in which the humid air that has been accumulating around the slip ring 30 during the day causes condensation to occur on the surface of the slip ring 30. Furthermore, when the temperature drops below 0°C, the condensation that has occurred on the surface of the slip ring 30 may turn into ice and cover the surface of the slip ring 30.

[0039] Here, in this embodiment, the anti-icing member 50 is housed in the housing 10 so as to come into contact with the slip ring 30 at a position different from that of the brush 40 . Therefore, the anti-icing member 50 in contact with the slip ring 30 prevents humid air that accumulates around the slip ring 30 during the day from adhering to the surface of the slip ring 30. This makes it possible to prevent condensation from forming on the surface of the slip ring 30 even when the temperature drops after sunset. Furthermore, it makes it possible to prevent the surface of the slip ring 30 from becoming covered in ice even when the temperature drops below 0°C during the day.

[0040] Furthermore, in this embodiment, the portion of the ice prevention member 50 that faces the slip ring 30 is in intimate contact with the slip ring 30 over the entire surface. Therefore, the anti-icing member 50 that completely covers the slip ring 30 prevents humid air from adhering to the surface of the slip ring 30 that faces the anti-icing member 50. In the embodiment, the anti-icing member 50 that comes into contact with the slip ring 30 at a position different from that of the brush 40 is formed with a porous structure. As a result, humid air that accumulates around the slip ring 30 during the day enters the numerous pores in the anti-icing member 50 .

[0041] Furthermore, the anti-icing member 50 has moisture absorbing properties. As a result, moisture is absorbed by the anti-icing member 50 from the humid air that accumulates around the slip ring 30 during the day. Before the crane 200 is used, the boom 203 is generally contracted to its shortest length, and when the crane 200 is used, the boom 203 is extended to a length appropriate for the work to be performed using the crane 200.

[0042] When the contracted boom 203 is extended, the distance between the base end boom 203a and the tip end boom 203c increases, the cable reel drum 21 rotates inside the housing 10, and the length of the cable 2 reeled out from the cable reel drum 21 also increases. Furthermore, when the retracted boom 203 is extended, inside the housing 10, the drum rotating shaft 22 rotates together with the cable reel drum 21, and the slip ring 30 also rotates. The brush 40 in contact with the slip ring 30 is fixed to the meter side housing 12, and the slip ring 30 rotates with the brush 40 pressed against it.

[0043] As described above, in the embodiment, it is possible to prevent the occurrence of a situation in which ice covers the surface of the slip ring 30, and therefore to prevent the occurrence of a situation in which the rotating brush 40 runs onto the ice covering the surface of the slip ring 30. This makes it possible to prevent malfunctions occurring in the crane 200 without heating the slip ring 30 using a heater or the like. In the embodiment, the pressing member 60 is fixed to the meter side housing 12 by inserting the three protruding claws 12d into the three protruding shaft insertion portions 63, respectively. Furthermore, the anti-icing member 50 is fixed to the pressing member 60 using an adhesive or the like. Therefore, even if the boom 203 is extended or retracted and the cable reel drum 21 rotates, the pressing member 60 and the anti-icing member 50 are prevented from rotating. Therefore, the slip ring 30 slides on the anti-icing member 50 in response to the rotation of the cable reel drum 21.

[0044] The above-described embodiment is one example of the present invention, and the present invention is not limited to the above-described embodiment. Various modifications can be made depending on the design, etc., even if the embodiment is a form other than the above-described embodiment, as long as the modifications do not deviate from the technical idea of ​​the present invention.

[0045] <Actions and Effects of the Embodiments> The current collecting device according to the embodiment can provide the following functions and effects.

[0046] (1) The device comprises a cable reel 20 that is housed in a housing 10 and is a rotating member that can rotate relatively to the housing 10, and a slip ring 30 that is attached to the cable reel 20 and housed in the housing 10, and rotates together with the cable reel 20. In addition, the device comprises a brush 40 that is fixed and housed in the housing 10 and in contact with the slip ring 30, and an anti-icing member 50 that is housed in the housing 10 so as to come into contact with the slip ring 30 at a position different from that of the brush 40. Therefore, the anti-icing member 50 in contact with the slip ring 30 prevents humid air that has accumulated around the slip ring 30 during the day from adhering to the surface of the slip ring 30, making it possible to suppress condensation that occurs on the surface of the slip ring 30.

[0047] As a result, it is possible to prevent the surface of the slip ring 30 from becoming covered with ice, and it is possible to prevent malfunctions of the crane 200 without heating the slip ring 30 using a heater or the like. This makes it possible to provide a current collecting device that can shorten the time required to start operation in a low-temperature environment such as a cold region. Furthermore, even if the current collecting device is attached to the tip boom 203c, which is far from the engine and in a position where heat is not easily transmitted, it is possible to provide a current collecting device that can shorten the time required to start work in low-temperature environments such as cold regions.

[0048] (2) The thickness of the anti-icing member 50 in the no-load state is greater than the distance between the slip ring 30 and the portion of the meter housing 12 that faces the slip ring 30 . As a result, the meter housing 12 presses the anti-icing member 50, thereby improving the stability of the state in which the anti-icing member 50 and the slip ring 30 are in close contact with each other. This makes it possible to prevent a gap from being formed between the anti-icing member 50 and the slip ring 30.

[0049] (3) The anti-icing member 50 is sandwiched between the slip ring 30 and the pressing member 60 housed in the housing 10. In addition, the pressing member 60 has a brush through-hole 64 through which the brush 40 passes. As a result, the pressing member 60 disposed between the meter housing 12 and the anti-icing member 50 can improve the stability of the state in which the anti-icing member 50 and the slip ring 30 are in close contact with each other. This makes it possible to prevent a gap from being formed between the anti-icing member 50 and the slip ring 30.

[0050] (4) The thickness of the anti-icing member 50 in the no-load state is greater than the distance between the slip ring 30 and the pressing member 60. As a result, by the pressing member 60 pressing the anti-icing member 50, it is possible to improve the stability of the state in which the anti-icing member 50 and the slip ring 30 are in close contact with each other. This makes it possible to prevent a gap from being formed between the anti-icing member 50 and the slip ring 30.

[0051] (5) The anti-icing member 50 is fixed to the pressing member 60 . As a result, it becomes possible to retrofit the pressing member 60 to which the anti-icing member 50 is fixed to a current collecting device that is not equipped with the anti-icing member 50. This makes it easy to change a crane 200 that is not designed for cold climates to a crane 200 designed for cold climates. Moreover, compared to a configuration that does not include the pressing member 60, assembly of the current collector is easier.

[0052] (6) The combined thickness of the anti-icing member 50 and the pressing member 60 in an unloaded state is greater than the distance between the slip ring 30 and the portion of the housing 10 that faces the slip ring 30. As a result, it is possible to improve the stability of the state in which the pressing member 60 and the anti-icing member 50 are in close contact with the housing 10 and the slip ring 30. This makes it possible to prevent a gap from being formed between the anti-icing member 50 and the slip ring 30.

[0053] (7) The pressing member 60 is fixed to the housing 10 . As a result, it becomes possible to prevent the anti-icing member 50 from shifting due to rotation of the slip ring 30, etc., and it becomes possible to improve the stability of the state in which the anti-icing member 50 is in close contact with the slip ring 30.

[0054] (8) The anti-icing member 50 is formed with a porous structure. As a result, inside the housing 10, humid air accumulating around the slip ring 30 can enter the numerous pores in the anti-icing member 50, making it possible to suppress condensation on the surface of the slip ring 30.

[0055] (9) The anti-icing member 50 has moisture absorbing properties. As a result, moisture is absorbed by the anti-icing member 50 from the humid air that has accumulated around the slip ring 30 inside the housing 10, making it possible to suppress condensation that occurs on the surface of the slip ring 30.

[0056] (10) The surface of the slip ring 30 that comes into contact with the brush 40 is plated. As a result, it is possible to prevent foreign matter such as powder generated when the brush 40 is worn away from adhering to the slip ring 30.

[0057] (11) A plurality of slip rings 30 are provided, the plurality of slip rings 30 having different diameters and arranged coaxially at intervals. As a result, compared to a current collecting device configured by stacking multiple slip rings 30, it is possible to shorten the time required to start operation in low-temperature environments such as cold regions for a current collecting device with a compact configuration.

[0058] (12) A rotating member that is rotatable relative to the housing 10 includes a cable reel 20 around which a cable 2 is wound, the cable 2 transmitting at least one of a signal and a power supply, and a slip ring 30 rotates coaxially with the cable reel 20. As a result, it is possible to reduce the time required for a current collector used in electric equipment such as the boom length detection device 300 to start operation in a low-temperature environment such as in a cold region.

[0059] (13) The portion of the anti-icing member 50 that faces the slip ring 30 is in intimate contact with the slip ring 30 over its entire surface. As a result, the anti-icing member 50, which completely covers the slip ring 30, prevents humid air from adhering to the surface of the slip ring 30 that faces the anti-icing member 50. This makes it possible to suppress condensation on the surface of the slip ring 30.

[0060] <Modification> (1) In the embodiment, the anti-icing member 50 is formed using felt, which is a nonwoven fabric with a porous structure, but the present invention is not limited to this. That is, the anti-icing member 50 may be formed using, for example, a nylon nonwoven fabric, which is a nonwoven fabric with a porous structure. Also, the moisture-absorbing member 50 may be formed using, for example, a nonwoven fabric with a nonporous structure, a sponge made of synthetic resin such as polyurethane, a highly flexible gel-like material whose main ingredient is silicone, a shock-absorbing material, a vibration-absorbing material, or the like.

[0061] (2) In the embodiment, the slip rings 30 are different in diameter and arranged coaxially at intervals, but the present invention is not limited to this. That is, for example, as shown in FIG. 7, the slip rings 30 may be arranged coaxially with the same diameter (a stacked type configuration). In this case, the pressing member 60 is not disc-shaped, but is a ring (C-ring) having a brush through hole 64. The anti-icing member 50 is also C-shaped, so that it contacts the slip rings 30 at a position different from the brush 40. In the stacked type configuration, as shown in FIG. 7, each slip ring 30 is attached to the outer circumferential surface of a bracket 70 formed in, for example, a cylindrical shape.

[0062] (3) In the embodiment, the current collecting device of the present invention is applied to a vehicle-mounted crane, but the present invention is not limited to this configuration and may be applied to, for example, other cranes or other work vehicles such as aerial work platforms, as long as the current collecting device has a slip ring 30 and a brush material.

[0063] (4) In the embodiment, the current collector is attached to the tip boom 203c, but this is not limited thereto, and the current collector may be attached to the base boom 203a. In this case, the tip of the cable 2 is attached to the tip boom 203c.

[0064] (5) In the embodiment, the portion of the anti-icing member 50 facing the slip ring 30 is in full, intimate contact with the slip ring 30, but this is not limited thereto. That is, a portion of the portion of the anti-icing member 50 facing the slip ring 30 may be in full, intimate contact with the slip ring 30.

[0065] <Example> With reference to the embodiments, cranes equipped with the current collecting devices of Examples 1 and 2 and cranes equipped with the current collecting devices of Comparative Examples 1 and 2 will be described below.

[0066] Example 1 As in the embodiment, the crane was configured to include a current collector in which an anti-icing member made of felt was in contact with a slip ring.

[0067] Example 2 The crane had the same configuration as in Example 1, except that it was equipped with a current collecting device in which an anti-icing member formed of a sponge was in contact with the slip ring.

[0068] Comparative Example 1 The crane had the same configuration as in Example 1, except that it was not equipped with anti-icing materials and was equipped with a current collecting device in which a surfactant was applied to the slip rings and brushes.

[0069] Comparative Example 2 The crane had the same configuration as in Example 1, except that it was not equipped with anti-icing materials and was equipped with a current collecting device in which grease was applied to the slip rings and brushes.

[0070] (Performance evaluation, evaluation results) The signal transmission state and power supply state were evaluated for the current collectors of Example 1 and Example 2 and the current collectors of Comparative Example 1 and Comparative Example 2. The evaluation method was to use the crane in a room temperature environment (about 25°C), and then place it in a low temperature environment (about -20°C) with the boom retracted. After that, without heating the current collector with a heater or the like, the crane was used again in a room temperature environment to investigate the signal transmission state and power supply state. Cases where no signal transmission or power supply was performed at all were rated as "X." Cases where signal transmission and power supply were performed in a state where the crane did not malfunction (about 90%) were rated as "O," and cases where signal transmission and power supply were performed perfectly were rated as "◎."

[0071] [Table 1]

[0072] As a result of evaluating various performances using the above-mentioned method, it was confirmed that the current collecting devices of Examples 1 and 2 did not cause malfunctions in the cranes, as shown in Table 1. On the other hand, it was confirmed that the current collecting devices of Comparative Examples 1 and 2 caused malfunctions in the cranes. Furthermore, it was confirmed that the current collecting device of Example 1 had better signal transmission conditions and power supply conditions than the current collecting device of Example 2. [Explanation of symbols]

[0073] 1 Current collector 2 Cable 3 Potentiometer 4 Signal Line 10. Chassis 11 Drum side housing 11a Reel storage section 11b Drum side flange 12 Meter side housing 12a Meter housing 12b Meter side flange 12c Projection shaft part 12d protruding claw 20 Cable reel 21 Cable reel drum 22 Drum rotation shaft 30 Slip Ring 40 Brushes 41 Mounting part 42 Arm 43 Contact part 44 Mounting seat 45 Mounting screw 50 Anti-icing materials 60 Holding member 61 Rotating shaft through hole 62 Rotating shaft rim 63 Protruding shaft insertion part 64 Brush through hole 65 Claw 70 Bracket 100 Crane-equipped vehicles 101 Cargo Bed 102 Cab 103 Chassis frame 200 Crane 201 Base 202 Column 203 Boom 203a Base boom 203b Intermediate Boom 203c Tip Boom 204 Hook 205 Outrigger 206 Wire Rope 300 Boom length detection device HP Position where the claws clamp the mounting base

Claims

1. A rotating member that is accommodated in a housing and is rotatable relative to the housing; a slip ring attached to the rotating member and housed in the housing, and rotating together with the rotating member; a brush fixedly accommodated in the housing and in contact with the slip ring; a current collecting device comprising: an anti-icing member housed in the housing so as to contact the slip ring at a position on the surface of the slip ring that contacts the brush, the position being different from the brush.

2. A rotating member housed in a housing and rotatable relative to the housing; a slip ring attached to the rotating member and housed in the housing, and rotating together with the rotating member; a brush fixedly accommodated in the housing and in contact with the slip ring; an anti-icing member housed in the housing so as to contact the slip ring at a position different from that of the brush; a pressing member that sandwiches the anti-icing member together with the slip ring and is housed in the housing, The pressing member is a current collector having a brush through hole through which the brush passes.

3. 3. The current collecting device according to claim 2, wherein a thickness of said anti-icing member in a no-load state is greater than a distance between said slip ring and said pressing member.

4. 4. The current collecting device according to claim 2, wherein the anti-icing member is fixed to the pressing member.

5. A current collecting device as described in claim 4, wherein the sum of the thickness of the anti-icing member and the thickness of the pressing member in an unloaded state is greater than the distance between the slip ring and the portion of the housing that faces the slip ring.

6. The current collecting device according to claim 2 , wherein the pressing member is fixed to the housing.

7. A current collecting device described in any one of claims 1 to 6, wherein the thickness of the anti-icing member in an unloaded state is greater than the distance between the slip ring and the part of the housing facing the slip ring.

8. The current collecting device according to claim 1 , wherein the anti-icing member is formed of a porous structure.

9. 9. The current collecting device according to claim 1, wherein the anti-icing member has hygroscopic properties.

10. 10. The current collecting device according to claim 1, wherein the surfaces of the slip rings that come into contact with the brushes are plated.

11. A plurality of the slip rings are provided, 11. The current collecting device according to claim 1, wherein the plurality of slip rings have different diameters and are arranged coaxially at intervals.

12. A plurality of the slip rings are provided, 11. The current collecting device according to claim 1, wherein the plurality of slip rings have the same diameter and are arranged coaxially.

13. the rotating member includes a cable reel around which a cable that transmits a signal and / or supplies power is wound; 13. The current collector according to claim 1, wherein the slip ring rotates coaxially with the cable reel.

14. 14. The current collecting device according to claim 1, wherein the anti-icing member has a portion facing the slip ring that is in full intimate contact with the slip ring.

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