Lid opening / closing device of fodder tank, and lid opening / closing system of fodder tank provided with lid opening / closing device of fodder tank

Abstract

To provide a lid opening / closing device capable of improving workability of feed-supplying work of an operator.SOLUTION: A lid opening / closing device 1 according to the present invention is assembled to a fodder tank 4 provided with, at a fodder feeding opening portion located on an apex of the fodder tank 4, a hinge type lid opening / closing between a lid-opening position in a face-up state and a lid-closing position in a supine state. The lid opening / closing device 1 of the fodder tank 4 is assembled to a support leg 10 for supporting the fodder tank. In a state where the hinge type lid 6 is suspended by a first wire member 18 extending from a suspension arm 24, the hinge type lid 6 is opened from the lid-closing position in the supine state of closing the fodder feeding opening portion to the lid-opening position in the face-up state located at the same height position as the fodder feeding opening portion or a lower height position than the fodder feeding opening portion.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lid opening / closing device for a feed tank and a lid opening / closing system for a feed tank provided with the same, and more particularly, to a lid opening / closing device provided in a feed tank and a lid opening / closing system for a feed tank provided with the same.

Background Art

[0002] Patent Documents 1 and 2 disclose a lid opening / closing device used for a feed tank, and disclose that an operator can open and close the lid of a feed inlet provided at the top of the feed tank without climbing to the top of the feed tank. Conventionally, in a facility for raising livestock such as a ranch, with the lid of the opening part at the top of the feed tank open, a supply part (boom) of a feed supply vehicle called a so-called bulk truck extends above the feed inlet opening part, and feed is supplied from the feed supply vehicle into the feed tank.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the lid of the feed introduction opening in Patent Document 1 and Patent Document 2 is configured to open perpendicularly to the feed introduction opening. Therefore, when refilling the contents of the feed tank, there is a risk that the boom of the bulk vehicle will interfere with the lid, limiting the approach method and position of the boom to the feed introduction opening, resulting in a problem of reduced work efficiency. In addition, if the lid of the feed introduction opening or the boom of the bulk vehicle is damaged due to interference, there is a concern that debris from the damage will get into the feed tank, causing quality problems such as the quality of the contents, such as feed, not being maintained. The inventors of the present invention therefore conducted extensive research into whether it would be possible to avoid interference between the boom of the bulk vehicle and the lid when refilling the tank contents, and thereby to avoid damage to the lid of the feed insertion opening or damage to the bulk vehicle boom, by opening the lid of the feed insertion opening so that it is approximately horizontal with the opening, or to a height lower than the opening.

[0005] Therefore, the present invention has been made to solve the problems required in the prior art described above, and aims to provide a lid opening and closing device for a feed tank that can open a hinged lid to an open lid position in a supine position where it is less likely to interfere with the boom, which is the supply part of a feed supply vehicle that supplies feed to the opening at the top of the feed tank. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, one embodiment of the present invention is a lid opening and closing device for a feed tank, which is equipped with a hinged lid that opens and closes between an open lid position in a supine position and a closed lid position in a supine position, and is attached to a feed tank having a feed input opening position located at the top of the feed tank, and the lid opening and closing device for the feed tank is characterized in that, with the hinged lid suspended by a first rope-like member extending from a hanging arm, the hinged lid opens from the closed lid position in the supine position that closes the feed input opening position to the open lid position in the supine position, which is at the same height position as the feed input opening position or at a lower height position than the feed input opening position. According to an embodiment of the present invention configured as described above, the lid opening / closing device of the feed tank is assembled to the support legs that support the feed tank. With the hinged lid suspended by the first cable member extending from the column with a suspension arm, the hinged lid moves from the lid-closed position closing the feed inlet opening to the lid-open position in a supine state that is at the same height as or lower than the feed inlet opening. Therefore, with the lid opening / closing device of the feed tank that is relatively simply assembled to the support legs of the feed tank, an operator can open the hinged lid to the lid-open position in a supine state that is less likely to interfere with the supply arm of the feed supply vehicle, i.e., the boom, for supplying feed to the feed inlet opening at the top of the feed tank. Thus, the workability of the operator's feed supply work can be improved with the lid opening / closing device of the feed tank that is relatively simply configured. Also, the lid opening / closing device of the feed tank can be relatively simply assembled to the support legs of the feed tank, making it easy to arrange the lid opening / closing device of the feed tank and reducing the installation cost. Furthermore, since the lid opening / closing device of the feed tank is stably assembled to the support legs of the feed tank, a lid opening / closing device of the feed tank that is stable and safe for the operator can be provided.

[0007] In order to solve the above problems, an embodiment of the present invention is that the lid opening and closing device of the feed tank includes a columnar member provided on the side of the feed tank and a suspension arm extending laterally from the upper part of the columnar member. A support column with a suspension arm, a stopper portion extending laterally from the support leg of the feed tank, a guide portion extending laterally from the support leg above the stopper portion, and a first cable member extending from the lower part of the feed tank to the hinge-type lid via the suspension arm. At least composed of, when the support column with the suspension arm is arranged on the stopper portion, the upper end of the support column with the suspension arm is in an upper position above the top of the feed tank, and the support column with the suspension arm is released by the stopper portion. By this, the upper end of the support column with the suspension arm is formed so as to be positioned at a lower position below the top of the feed tank. According to an embodiment of the present invention configured as described above, when the support column with the suspension arm is arranged on the stopper portion, the upper end of the support column with the suspension arm is in an upper position above the top of the feed tank, and the support column with the suspension arm is released by the stopper portion. By this, the upper end of the support column with the suspension arm is in a lower position below the top of the feed tank, and the support column with the suspension arm can be positioned. Therefore, the upper end of the support column with the suspension arm is arranged in an upper position above the top of the feed tank, and in a state where the lid 6 is suspended by the first rope 18 extending from the support column 14 with the suspension arm, the lid 6 can be opened from the lid-closed position closing the opening portion 8b to the lid-open position in a supine state where it is less likely to interfere with the supply arm. Therefore, the workability of the operator's feed supply work can be improved. Further, when feeding feed to the feed inlet opening at the top of the feed tank, the support of the support column with the suspension arm by the stopper portion is released, so that the upper end of the support column with the suspension arm can be arranged at the lower position. Therefore, it is possible to make the support column with the suspension arm less likely to interfere with the supply arm of the feed supply vehicle. Therefore, the workability of the operator's feed supply work can be further improved.

[0008] In one embodiment of the present invention, preferably, further, a weight side cable member extending from the cable member attachment portion of the column with a suspension arm, a guide for the weight side cable member provided above the cable member attachment portion and for hanging the weight side cable member, and a weight portion to which the weight side cable member is attached are provided. According to one embodiment of the present invention configured as described above, when the column with a suspension arm moves downward, the weight portion applies an upward force to the column with a suspension arm, and when the column with a suspension arm moves upward, the weight portion can act to assist the upward force on the column with a suspension arm. Therefore, when the column with a suspension arm moves downward, the risk of the column with a suspension arm falling and injuring the operator's foot can be reduced, and when the column with a suspension arm moves upward, the force required for the operator to lift the column with a suspension arm can be reduced, thereby reducing the work load of the operator. Thus, the safety and workability of the operation of the operator moving the column with a suspension arm up and down can be further improved.

[0009] In one embodiment of the present invention, preferably, the lid opening and closing device for the feed tank further includes a first weight portion attached to the first cable member, and a first cable member guide for guiding the first cable member to the first weight portion via the suspension arm. According to one embodiment of the present invention configured as described above, when the first cable member is pulled in the direction of opening the hinge-type lid from the state where the first weight portion is attached to the first cable member and the hinge-type lid is closed, the first weight portion acts with a force to assist the movement of the first cable member, so that the force required for the operator to pull the first cable member can be reduced, and the work load of the operator can be reduced. Also, when the first cable member is further pulled in the opening direction due to the self-weight of the hinge-type lid from the state where the hinge-type lid is lifted, the first weight portion acts with a force to suppress the movement of the first cable member (a force resisting the movement), thereby suppressing the hinge-type lid from falling forcefully onto the feed tank and damaging the feed tank.

[0010] In one embodiment of the present invention, preferably, the lid opening / closing device for the feed tank further includes a second cord member extending from the lower part of the feed tank to the hinged lid via the suspension arm, a second weight portion attached to the second cord member, and a second cord member guide for guiding the second cord member to the second weight portion via the suspension arm. According to one embodiment of the present invention configured as described above, when the second weight portion is attached to the second cord member and the second cord member is pulled in the direction of closing the hinged lid from the state where the hinged lid is open, the second weight portion acts a force to assist the movement of the second cord member, so that the force for the operator to pull the second cord member can be reduced, and the working load of the operator can be alleviated. Further, when the second cord member is pulled further in the closing direction by the own weight of the hinged lid from the state where the hinged lid is lifted, the second weight portion acts a force to suppress the movement of the second cord member (a force against the movement), and it can be suppressed that the hinged lid falls vigorously onto the opening portion of the feed tank and damages the feed tank.

[0011] In one embodiment of the present invention, preferably, the weight of the support column with the suspension arm is heavier than the weight of the weight portion, and the weight of the weight portion is heavier than 70% of the weight of the support column with the suspension arm. According to one embodiment of the present invention configured as described above, the weight of the support column with the suspension arm is heavier than the weight of the weight portion, and the weight of the weight portion is heavier than 70% of the weight of the support column with the suspension arm. Thereby, when the support column with the suspension arm moves downward, the risk that the support column with the suspension arm falls and injures the operator's foot can be further reduced, and when the support column with the suspension arm moves upward, the force for the operator to lift the support column with the suspension arm can be further reduced, and the working load of the operator can be further alleviated.

[0012] In one embodiment of the present invention, preferably, the support leg to which the support column with the suspension arm is assembled among the support legs of the feed tank is the support leg located outside the hinge side of the hinged lid. According to an embodiment of the present invention configured as described above, a support column with a suspension arm is assembled to the support leg located outside the hinge side of the hinged lid, and the hinged lid is opened and closed in a state where it is suspended by a first cord member extending from the support column with a suspension arm. As a result, the hinged lid can be lifted by the first cord member from the opening direction of the hinged lid, making it easy to improve the efficiency of the force required to open the hinged lid and making it easy to lift it as a stable operation. Therefore, the workability of the operator's feed supply work can be improved.

[0013] In an embodiment of the present invention, a lid opening and closing system for a feed tank provided with a lid opening and closing device for the feed tank can be provided.

Effect of the Invention

[0014] According to the present invention, the workability of the operator's feed supply work can be improved.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Mode for Carrying Out the Invention

[0016] Next, with reference to the accompanying drawings, a lid opening and closing system provided with a lid opening and closing device according to an embodiment of the present invention will be described. Embodiments of the present disclosure are described by way of example, and it will be apparent to those skilled in the art that many modifications, changes, and substitutions can be made within the spirit and scope of the present invention. Therefore, the present invention is not limited to the disclosed embodiments, and various modifications, changes, etc. are possible in its form and details without departing from the scope of the claims. FIG. 1 is a perspective view of a lid opening / closing system provided with a lid opening / closing device for a feed tank according to an embodiment of the present invention. FIG. 2 is a top view of a lid opening / closing system provided with a lid opening / closing device for a feed tank according to an embodiment of the present invention. FIG. 3 is a perspective view of a lid opening / closing system provided with a lid opening / closing device for a feed tank according to an embodiment of the present invention. FIG. 4 is a side view of a lid opening / closing system provided with a lid opening / closing device for a feed tank according to an embodiment of the present invention. In FIG. 4, the opening direction of the lid is indicated by arrow D1, and the closing direction of the lid is indicated by arrow D2.

[0017] As shown in FIG. 1, in one embodiment of the present invention, a lid opening / closing device 1 for a feed tank is provided in a lid opening / closing system 2 for a feed tank. The lid opening / closing system 2 includes a feed tank 4 and a lid opening / closing device 1 provided on the feed tank 4.

[0018] The feed tank 4 is a large-sized tank of such a size that an operator climbs a ladder from the ground to the position of the lid in order to open and close the lid 6 of the feed tank 4. The feed tank 4 is a tank for storing livestock feed, such as granular compound feed. As shown in FIG. 4, the height H of the feed tank 4 from the ground G to the top lid 6 (the lid in the closed position) is formed to be 3 m to 10 m, for example, 5 m to 10 m, for example, 7 m. Such a large-sized feed tank 4 is mainly arranged outdoors.

[0019] As shown in FIG. 1, the feed tank 4 includes a tank body 8 formed in a hollow shape, a lid 6 provided at an opening portion 8b (see FIG. 4) at the top 8a of the tank body 8, and support legs 10 for supporting the tank body 8. Although the ladder of the feed tank 4 is not shown, it may be provided in advance on the feed tank 4, or an arbitrary ladder may be prepared and used when necessary.

[0020] The tank body 8 is formed in a cylindrical shape and is formed so that feed can be stored inside. The tank body 8 is formed of a resin such as fiber-reinforced plastic (FRP). The top 8a of the tank body 8 is formed in a conical shape, and a circular opening portion 8b (see Fig. 4) is formed at the center of the top 8a. The opening portion 8b of the tank body 8 can be an opening portion for feed input (feed input opening portion). The tank body 8 is formed with a discharge port portion 8c for feed discharge at the bottom.

[0021] The lid 6 is formed to cover the opening portion 8b of the top 8a of the tank body 8. The lid 6 is formed as a hinged lid that opens and closes between an open lid position in a supine state (see Fig. 8) and a closed lid position in a prone state (see Fig. 4). The lid 6 functions as, for example, a feed input opening lid that covers the opening portion for feed input. In relation to the opening portion 8b, the lid 6 is opened from the closed lid position closing the opening portion 8b to the open lid position opening the opening portion 8b. The lid 6 is generally formed in a circular shape and is formed to be slightly larger than the circular opening portion 8b (see Fig. 4). The lid 6 is formed in a dome shape and is formed such that the height of the central portion is higher than the height of the edge portion (see Fig. 4). The lid 6 is formed of a metal such as iron. The lid 6 has a weight in the range of about 3 kg to 7 kg, for example, a weight of 4.5 kg.

[0022] The lid 6 is a hinged lid that is rotatably formed about the hinge portion 12. The hinge portion 12 of the lid 6 has a hinge structure. The lid 6 is rotatably formed about the extending direction of the hinge portion 12, that is, the extending direction of the rotation center axis A of the hinge portion 12 (the rotation center axis A is shown by a dashed line in Figs. 1 and 2). The rotation center axis A of the hinge portion 12 extends generally horizontally and extends toward the side of the tank body 8. In a top view, the hinge portion 12 is disposed at a position shifted from the center C of the tank body 8 (the center C is virtually shown in Fig. 2) and is disposed at a position outside and near the opening portion 8b.

[0023] The support legs 10 are attached to the side of the lower part of the tank body 8. The support legs 10 are formed by rod-shaped members extending from the ground G (see FIG. 4) to the side of the tank body 8. The support legs 10 are installed on the ground and are configured to support the weight of the tank body 8 and the like by four support legs. The support legs 10 are arranged, for example, one by one in the closing direction and the opening direction of the lid 6, and further one by one in the left-right direction of the lid 6. The support legs 10 are arranged symmetrically with respect to the lid 6 at 90-degree intervals on the outside of the tank body 8. The number and shape of the support legs 10 may be changed. The support legs 10 are formed, for example, by stainless steel circular pipes.

[0024] As shown in FIG. 4, the lid opening / closing device 1 of the feed tank 4 is a device for opening and closing the hinged lid 6. The lid opening / closing device 1 of the feed tank 4 includes a support column 14 with a suspension arm provided on the side of the feed tank 4, a stopper portion 16 extending laterally from the support leg 10 that supports the tank body 8 of the feed tank 4, a guide portion 17 extending laterally from the support leg 10 above the stopper portion 16, a first rope 18 which is the first cord-like member extending from the lower part of the feed tank through the suspension arm 24 to the hinged lid, and a second rope 19 which is the second cord-like member extending from the lower part of the feed tank through the suspension arm 24 to the hinged lid.

[0025] The support column 14 with a suspension arm forms a wire pole for guiding the first rope 18 and the second rope 19. Therefore, the support column 14 with a suspension arm functions as a guide pole for guiding the first rope 18 and the second rope 19. The support column 14 with a suspension arm extends in a crane-like manner from the side of the tank body 8 to above the center of the tank body 8 (above the opening portion 8b) at the upper position.

[0026] The support column 14 with a suspension arm is assembled to the support leg 10 that supports the feed tank 4. The column 14 with a suspension arm is arranged on the side of the tank body 8 of the feed tank 4 and is located outside the hinge portion 12 when viewed from the center C of the tank body 8 (see Fig. 2). Therefore, the column 14 with a suspension arm is located outside the open position of the lid 6 that rotates about the hinge portion 12. Also, the column 14 with a suspension arm is arranged at a position outside the rotation center axis A of the hinge portion 12 when viewed from the center C. As shown in Figs. 1 and 4, the column 14 with a suspension arm includes a columnar member 22 extending in the vertical direction parallel to the attached support leg 10, and a suspension arm 24 extending laterally from the upper part of the columnar member 22. The columnar member 22 is a linear rod-shaped member and extends in the vertical direction. The columnar member 22 is provided on the side of the feed tank 4. The column 14 with a suspension arm is also provided so as to be rotatable about a central axis B (see Fig. 4) extending in the vertical direction. The central axis B is the central axis in the longitudinal direction of the columnar member 22. The central axis B is indicated by a dashed line in Fig. 4.

[0027] As will be described later, the columnar member 22 of the column 14 with a suspension arm is configured to be able to move up and down within the ring of the guide portion 17. Therefore, the column 14 with a suspension arm is configured to be movable in the vertical direction. When the column 14 with a suspension arm is arranged on the stopper portion 16 described later, the upper end of the column 14 with a suspension arm is at an upper position above the top of the feed tank 4, and when the support of the column 14 with a suspension arm by the stopper portion 16 is released, the upper end of the column 14 with a suspension arm is at a lower position below the top of the feed tank 4. The column 14 with a suspension arm is formed so as to be positionable at these positions. The columnar member 22 has a length corresponding to the height from the ground G (see Fig. 4) to the opening portion 8b of the tank body 8. For example, the length of the columnar member 22 is a length within the range of the height to the opening portion 8b of the tank body 8, for example, 3 m to 7 m. As shown in Fig. 4, the columnar member 22 is formed such that, in the raised position, its upper end 22a is located above the lid and its lower end 22b is located below about 1.5 m above the ground. For example, the columnar member 22 is in the raised position when the lid 6 is suspended or the like. Also, as shown in Fig. 10, the columnar member 22 is formed such that, in the lowered position, its upper end 22a is located at the same level as or below the lid 6 and its lower end 22b is located on the ground G (or the base 10a of the support leg 10). The base 10a of the support leg 10 is formed in a circular shape with a radius larger than the radius of the support leg 10. The base 10a is made of stainless steel and is fixed to the support leg 10. The base 10a may be constituted by a ballast or the like. Also, as shown in Fig. 11, for example, the columnar member 22 is in the lowered position when feeding feed into the opening portion 8b or the like. In this way, the columnar member 22 is formed to have a length substantially the same as or shorter than the distance from the lid 6 of the feed tank 4 to the ground G. The columnar member 22 is formed of, for example, a pole such as a circular pipe. The columnar member 22 and the suspension arm 24 are members made of stainless steel. The weight of the column 14 with the suspension arm is in the range of 5 kg to 12 kg, for example, 5 kg.

[0028] The columnar member 22 of the column 14 with the suspension arm is not fixed to the guide portion 17 and can rotate within the ring of the guide portion 17. The columnar member 22 of the column 14 with the suspension arm is in a state of being rotatably placed on the plane of the stopper 38 (see Fig. 5). In this way, the columnar member 22 is not fixed in the rotational direction about the central axis B.

[0029] As shown in Fig. 5, the columnar member 22 of the column 14 with the suspension arm is disposed on the stopper portion 16 described later. A lower lever 22c, which is an operating lever, is formed at the lower end of the columnar member 22. The lower lever 22c extends horizontally from the lower end portion 22b of the columnar member 22. The lower lever 22c is formed as an operation portion for an operator to operate the column with a suspension arm 14, and in a state where the operator holds the lower lever 22c, the operator can easily raise and lower the lower lever 22c and the column with a suspension arm 14.

[0030] As shown in FIG. 5, a middle lever 22d, which is an additional operation lever, is further formed on the columnar member 22 at a position having a height between 1 m and 1.5 mm above the lower end portion 22b. Since the columnar member 22 is provided with the middle lever 22d, even when the columnar member 22 is in the lowered position, the operator can easily raise the columnar member 22 by grasping the middle lever 22d without bending down to the ground.

[0031] The suspension arm 24 extends from the upper end portion of the columnar member 22 toward the inside of the tank body 8. The suspension arm 24 forms a beam member 24a extending substantially in the horizontal direction. Furthermore, the suspension arm 24 includes an inclined portion 24b that obliquely connects the middle portion of the beam member 24a and the columnar member 22. The structure of the suspension arm 24 may be formed only by the other structure, for example, only the beam member 24a, or may be a combination of the beam member 24a and other reinforcing structures, for example.

[0032] As shown in FIGS. 1 and 4, the lid opening / closing device 1 further includes a guide portion 17 extending laterally from the support leg 10 above the stopper portion 16, a stopper portion 16 extending laterally from the support leg 10 that supports the tank body 8 of the feed tank 4, a first rope 18 that is the first cord member extending from the lower portion of the feed tank 4 to the handle portion 6b of the lid 6 via the suspension arm, and a second rope 19 that is the second cord member extending from the lower portion of the feed tank 4 to the handle portion 6b of the lid 6 via the suspension arm.

[0033] As shown in FIG. 1 and the like, the guide portion 17 is a connecting member having both ends formed in an annular shape and an intermediate portion formed in a flat plate shape. The proximal end of the guide portion 17 is fixed to the support leg 10. The distal end of the guide portion 17 forms an annular guide portion. Therefore, in a state where the columnar member 22 of the column 14 with a suspension arm is supported within the guide portion 17, the columnar member 22 is enabled to move vertically between an upper position and a lower position. The guide portion 17 is provided at four locations, but the number and position of the guide portion 17 can be arbitrarily changed.

[0034] As shown in FIG. 10, the stopper portion 16 includes a stopper guide 36 that bifurcates midway, and a stopper 38 that covers the upper side of the stopper guide 36 and is slidable in the longitudinal direction.

[0035] The stopper guide 36 branches into a fork shape at the intermediate portion. The two guides of the stopper guide 36 are each formed in a flat plate shape and extend parallel to each other. The width between the two guides of the stopper guide 36 is wider than the width of the columnar member 22. Therefore, the columnar member 22 can move vertically through between the two guides in a state where the stopper 38 is removed or the stopper 38 is shifted to such an extent that the columnar member 22 can pass through.

[0036] The stopper 38 is formed such that both ends of the flat plate hang downward. The stopper 38 is formed to cover the upper sides of the two guides of the stopper guide 36. The stopper 38 is slidable in the longitudinal direction along the upper surfaces and outer surfaces of the two guides. The stopper 38 is formed such that the width of the stopper 38 in a top view is larger than the width of the columnar member 22. The stopper 38 is formed with a thickness and strength that can support the load of the column 14 with a suspension arm in a state where the columnar member 22 is placed on its upper surface. Therefore, the stopper 38 forms a support base on the stopper guide 36 that supports the load of the column 14 with a suspension arm. The stopper 38 is detachable from the stopper guide 36. When the stopper 38 is removed from the stopper guide 36, the columnar member 22 moves downward between the stopper guides 36 and descends to the ground.

[0037] As shown in FIG. 1, the lid opening / closing device 1 of the feed tank 4 further includes a weight-side cord member 40 extending from the cord member attachment portion 41 of the column with a suspension arm 14, a weight-side cord member guide 42 provided above the cord member attachment portion 41 and around which the weight-side cord member 40 is looped, and a weight portion 44 to which the weight-side cord member 40 is attached.

[0038] One end of the weight-side cord member 40 is connected to the columnar member 22, and the other end is connected to the weight portion 44. The weight-side cord member 40 has its direction changed and is guided from the columnar member 22 via the weight-side cord member guide 42. The weight-side cord member 40 applies an upward force to the columnar member 22 by the weight portion 44. The weight-side cord member 40 has flexibility. The weight-side cord member 40 can be changed to a cord member such as a string, a cable, a wire, a belt, or a chain.

[0039] The weight-side cord member guide 42 forms a pulley around which the weight-side cord member 40 is looped, but it may be another shaped member that can guide the weight-side cord member 40, such as a ring or a guide portion. The weight-side cord member guide 42 is fixed to the support leg 10 at a position above the cord member attachment portion 41. The weight-side cord member 40 is looped around the weight-side cord member guide 42, changing the direction in which the weight-side cord member 40 is pulled.

[0040] The weight portion 44 is connected to the weight side cable-like member 40, and the weight portion 44 is configured to move up and down together with the support column 14 with a suspension arm and the weight side cable-like member 40. The weight portion 44 is formed in a bag shape like a rectangular parallelepiped. The weight portion 44 contains sand, soil, etc. and is formed to have a predetermined weight. The weight portion 44 has a predetermined weight, for example, within the range of 7 kg to 12 kg, for example, a weight of 10 kg. The weight of the support column 14 with a suspension arm is heavier than the weight of the weight portion 44. The weight of the weight portion 44 is heavier than 70% of the weight of the support column 14 with a suspension arm and lighter than 100% of the weight of the support column 14 with a suspension arm. The weight portion 44 is heavier than each of the first weight portion 58 and the second weight portion 68. As a modification, it is also possible to omit the weight portion 44 (there is no weight portion 44 at the end of the weight side cable-like member 40) or to set the state where sand, soil, etc. are not contained in the bag-shaped weight portion 44. Therefore, although an upward force does not act on the columnar member 22 by the weight portion 44, the support column 14 with a suspension arm can lift the lid 6 by, for example, the first rope 18 or the like.

[0041] As shown in FIG. 4, the lid opening / closing device 1 for the feed tank 4 further includes a first cable-like member guide 50 that guides the first rope 18 via the suspension arm 24 to the first weight portion 58, and the first weight portion 58 attached to the first rope 18.

[0042] As shown in FIG. 4, the first cable-like member guide 50 includes a first guide 51 provided on the suspension arm 24 that guides the first rope 18 from the suspension arm 24 toward the hinge-type lid 6, a second guide 52 provided on the suspension arm 24 that guides the first rope 18 from the columnar member 22 toward the suspension arm 24, a third guide 54 (see FIG. 5) that guides the first rope 18 upward from the lower part of the support leg 10, and a fourth guide 56 provided above the third guide 54 that guides the first rope 18 extending from the third guide 54 downward.

[0043] The first rope 18 has one end connected to the lid 6 and the other end connected to the first weight portion 58. The first rope 18 is redirected and guided from the lid 6 via the first guide 51, the second guide 52, the third guide 54, and the fourth guide 56. The first rope 18 extends vertically along the columnar member 22 on the side of the tank body 8. The first rope 18 has flexibility. The first rope 18 can be changed to a cord-like member such as a string, a cable, a wire, a belt, or a chain. The positions and numbers of the first guide 51, the second guide 52, the third guide 54, and the fourth guide 56 can be arbitrarily changed according to the manner of guiding the first rope 18. For example, any one of the first guide 51, the second guide 52, the third guide 54, and the fourth guide 56 may be omitted.

[0044] As shown in FIG. 4, the first guide 51 forms a pulley (for example, a pulley formed by a base and a pulley portion) around which the first rope 18 is looped, but it may also be a member of another shape that can guide the first rope 18, such as a ring or a guide portion. The first guide 51 is disposed slightly closer to the columnar member 22 than the tip of the suspension arm 24. The first guide 51 is disposed outside the hinge portion 12. The first guide 51 has the first rope 18 looped around it and changes the direction in which the first rope 18 is pulled.

[0045] The second guide 52 forms a pulley around which the first rope 18 is looped, but it may also be a member of another shape that can guide the first rope 18, such as a ring or a guide portion. The second guide 52 is disposed at the base of the suspension arm 24. The first rope 18 is looped around the second guide 52, changing the direction in which the first rope 18 is pulled from horizontal to downward.

[0046] As shown in FIG. 5, the third guide 54 and the fourth guide 56 also each form a pulley around which the first rope 18 is looped (engaged), but may be other shaped members such as rings or guide portions that can guide the first rope 18. The third guide 54 is provided at the lower part of the support leg 10. The fourth guide 56 is provided above the third guide 54. The third guide 54 has the first rope 18 looped around it and changes the direction in which the first rope 18 is pulled from downward to upward as viewed from the lid side. The fourth guide 56 has the first rope 18 looped around it and changes the direction in which the first rope 18 is pulled from upward to downward as viewed from the lid side.

[0047] The first weight portion 58 has the first rope 18 connected thereto, and the first weight portion 58 is configured to move up and down together with the first rope 18. The first weight portion 58 is disposed below the fourth guide 56. The first weight portion 58 is formed in a bag shape like a rectangular parallelepiped. The first weight portion 58 contains sand, soil, etc. and is formed to have a predetermined weight. Each of the first weight portions 58 has a predetermined weight, for example, within the range of 3 kg to 10 kg, for example, a weight of 5 kg. The total weight of the first weight portion 58 and the second weight portion 68 is smaller than the weight of the lid 6. As a modification, it is also possible to omit the first weight portion 58 (there is no first weight portion 58 at the end of the first rope 18) or to have a state where the first weight portion 58 in the shape of a bag does not contain sand, soil, etc. Therefore, although the force pulling the first rope 18 by the first weight portion 58 does not act on the first rope 18, when the first rope 18 can be pulled by a force of sufficient magnitude by a person or the like, the lid 6 can be pulled up from the closed state to the open state side by the first rope 18.

[0048] As shown in FIG. 4, the lid opening and closing device 1 for the feed tank 4 further includes a second cord member guide 60 that guides the second rope 19 via a suspension arm 24 to the second weight portion 68, and a second weight portion 68 attached to the second rope 19.

[0049] The second cable member guide 60 is provided on the suspension arm 24 on the tip side of the suspension arm 24 (the center side of the feed tank 4) rather than the first guide 51, and guides the second rope 19 from the suspension arm 24 toward the lid 6. It includes a fifth guide 61, a sixth guide 62 provided on the base side of the suspension arm 24 (outside the feed tank 4) rather than the fifth guide 61, a seventh guide 63 provided on the suspension arm 24 for guiding the second rope 19 from the direction along the columnar member 22 toward the suspension arm 24, an eighth guide 64 (see FIG. 6) for guiding the second rope 19 upward from the lower part of the support leg 10, a ninth guide 66 provided above the eighth guide 64 for guiding the second rope 19 extending from the eighth guide 64 downward, and a second weight part 68 attached to the second rope 19 below the ninth guide 66.

[0050] One end of the second rope 19 is connected to the lid 6, and the other end is connected to the second weight part 68. The second rope 19 extends from the lower part of the feed tank 4 to the lid 6 via the suspension arm 24. The direction of the second rope 19 is changed and guided via the lid 6, the fifth guide 61, the sixth guide 62, the seventh guide 63, the eighth guide 64, and the ninth guide 66. The second rope 19 extends vertically along the columnar member 22 on the side of the tank body 8. The second rope 19 has flexibility. The second rope 19 can be changed to a cable-like member such as a string, a cable, a wire, a belt, or a chain. The positions and numbers of the fifth guide 61, the sixth guide 62, the seventh guide 63, the eighth guide 64, and the ninth guide 66 can be arbitrarily changed according to the mode of guiding the second rope 19. For example, any one of the fifth guide 61, the sixth guide 62, the seventh guide 63, the eighth guide 64, and the ninth guide 66 may be omitted.

[0051] As shown in FIG. 4, the fifth guide 61 forms a pulley around which the second rope 19 is looped. However, other shaped members such as a ring or a guide portion that can guide the second rope 19 may be used. The fifth guide 61 is disposed at the tip of the suspension arm 24. As shown in FIG. 2, in a top view, the fifth guide 61 is disposed inside the hinge portion 12. The second rope 19 is looped around the fifth guide 61, changing the direction in which the second rope 19 is pulled.

[0052] The sixth guide 62 forms a pulley around which the second rope 19 is looped. However, other shaped members such as a ring or a guide portion that can guide the second rope 19 may be used. The sixth guide 62 is disposed at the middle of the suspension arm 24. The second rope 19 is looped around the sixth guide 62, changing the direction in which the second rope 19 is pulled from a substantially horizontal direction in the lateral direction to a diagonally downward direction in the lateral direction.

[0053] The seventh guide 63 forms a pulley around which the second rope 19 is looped. However, other shaped members such as a ring or a guide portion that can guide the second rope 19 may be used. The seventh guide 63 is disposed at the base of the suspension arm 24. The second rope 19 is looped around the seventh guide 63, changing the direction in which the second rope 19 is pulled from the lateral direction to the downward direction.

[0054] As shown in FIG. 6, the eighth guide 64 and the ninth guide 66 also each form a pulley around which the second rope 19 is looped (engaged). However, other shaped members such as a ring or a guide portion that can guide the second rope 19 may be used. The eighth guide 64 is provided at the lower part of the support leg 10. The ninth guide 66 is provided above the eighth guide 64 and below the seventh guide 63. The second rope 19 is looped around the eighth guide 64, changing the direction in which the second rope 19 is pulled from the downward direction to the upward direction as viewed from the lid side. The second rope 19 is looped around the ninth guide 66, changing the direction in which the second rope 19 is pulled from the upward direction to the downward direction as viewed from the lid side.

[0055] The second weight portion 68 is connected to the second rope 19, and the second weight portion 68 is configured to move up and down together with the second rope 19. The second weight portion 68 is disposed below the ninth guide 66. The second weight portion 68 is formed in a bag shape like a rectangular parallelepiped. The second weight portion 68 contains sand, soil, etc. and is formed to have a predetermined weight. The second weight portion 68 has a predetermined weight, for example, within the range of 3 kg to 10 kg, for example, a weight of 5 kg. As a modification, the second weight portion 68 may be omitted (there is no second weight portion 68 at the end of the second rope 19) or the second weight portion 68 in the bag shape may not contain sand, soil, etc. Accordingly, although the force for pulling the second rope 19 by the second weight portion 68 does not act on the second rope 19, when the second rope 19 can be pulled by a sufficiently large force by a person or the like, the lid 6 can be pulled up from the open state to the closed state side by the second rope 19.

[0056] Next, with reference to FIGS. 4 to 13, the operation of opening and closing the lid 6 by the lid opening / closing device 1 of the lid opening / closing system 2 will be described.

[0057] First, as shown in FIG. 4, in the state before the start of work, the lid 6 is in the closed lid position, and the opening portion 8b of the tank body 8 is closed by the lid 6. The column 14 with a hanging arm of the lid opening / closing device 1 is disposed on the stopper portion 16 and is in the raised position, and the columnar member 22 and the hanging arm 24 are also in the raised position. The upper end 22a of the columnar member 22 is located at a height higher than the height of the lid 6. The columnar member 22 is located on the side of the hinge portion 12. The hanging arm 24 extends from the side of the tank body 8 above the opening portion 8b. The hanging arm 24 shown in FIG. 4 is in the initial position. When viewed from the side of the hinge portion 12, the tip of the hanging arm 24 extends to the handle portion 6b side (closed lid position side) of the lid 6 rather than the hinge portion 12.

[0058] The first rope 18 extends from the handle portion 6b through the first guide 51, the second guide 52, the third guide 54, and the fourth guide 56 of the first cable member guide 50 to the first weight portion 58. Therefore, the force of the first weight portion 58, which will be described later, acts on the first rope 18, and the first rope 18 extends from the suspension arm 24 toward the handle portion 6b of the lid 6 in a tensioned state. Since the force of the first weight portion 58 acting on the first rope 18 alone is smaller than the force required to open the lid 6 from the closed position, the lid 6 does not open and remains in the closed state, and the first rope 18 also does not move and is in a stopped state.

[0059] The columnar member 22 is disposed on the stopper portion 16, and the second rope 19 extends from the handle portion 6b through the fifth guide 61, the sixth guide 62, the seventh guide 63, the eighth guide 64, and the ninth guide 66 of the second cable member guide 60 to the second weight portion 68. Therefore, the force of the second weight portion 68, which will be described later, acts on the second rope 19, and the second rope 19 extends from the suspension arm 24 toward the handle portion 6b of the lid 6 in a tensioned state. Since the force of the second weight portion 68 acting on the second rope 19 alone is smaller than the force required to open the lid 6 from the closed position, the lid 6 does not open and remains in the closed state, and the second rope 19 also does not move and is in a stopped state. Note that the sum of the force of the first weight portion 58 acting on the lid 6 and the force of the second weight portion 68 acting on the lid 6 is smaller than the force required to open the lid 6 from the closed position.

[0060] An operator, for example, the driver of a feed supply vehicle that transports feed, starts opening and closing the lid 6 in order to put the feed into the tank body 8. If the columnar support with a suspension arm 14 is in the lowered position, the operator raises the columnar support with a suspension arm 14 to the raised position and disposes it on the stopper portion 16.

[0061] Next, the operator manually pulls down the first rope 18 in the direction of pulling it down from a state of standing on the ground G to lower the first rope 18. As shown in FIG. 4, at the start of pulling down, the lid 6 is in the closed position. In response to the pulling down of the first rope 18, the handle part 6b (first rope attachment part) of the lid 6 is pulled upward toward the first guide 51 of the suspension arm 24, and the lid 6 is gradually opened. At this time, the lid 6 is in a state of being suspended by the first rope 18 extending from the suspension arm 24.

[0062] As shown in FIG. 7, in response to the pulling down of the first rope 18, the lid 6 is gradually opened, and the lid 6 (for example, the center of gravity or the tip part 6a of the lid 6) can be opened further to the opening side beyond above the hinge part 12. The lid 6 is pulled upward toward the suspension arm 24 by the first rope 18 and is opened further to the opening side beyond above the hinge part 12. After the lid 6 is opened further to the opening side beyond above the hinge part 12, the lid 6 can move further to the opening side by its own weight. Therefore, the operator stops the operation of pulling down the first rope 18 from the ground G, and thereafter starts the operation of feeding out the first rope 18 from the ground G (the operation of feeding out the first rope 18 pulled by the own weight of the lid 6 at a low speed while holding it).

[0063] Next, the lid 6 tries to move (fall) further to the opening side by its own weight. The operator feeds out the first rope 18 at a low speed while holding it. The lid 6 is in a state of being suspended by the first rope 18 extending from the suspension arm 24. The lid 6 is gradually opened. At this time, the first rope 18 applies an upward force (pulling force) to the lid 6 to prevent the lid 6 from falling and colliding with the tank body 8. The lid 6 is lowered toward the tank body 8 at a gentle speed, preventing it from colliding with the tank body 8 and preventing the tank body 8 from being damaged. When the lid 6 tries to fall further to the opening side by its own weight, the second rope 19 described later also applies an upward force (pulling force) to the lid 6, so that it is possible to further prevent the lid 6 from colliding with the tank body 8 forcefully.

[0064] As shown in FIGS. 8 and 9, the first rope 18 is further fed out, and the lid 6 is opened to a supine open-lid position where it is at the same height as the opening part 8b or at a height lower than the opening part 8b. In this embodiment, the lid 6 stops at the open-lid position while being in contact with the upper surface of the tank body 8. However, a seat or the like may be formed on the upper surface of the tank body 8, and the lid 6 may be seated on the seat. With the lid 6 in the open-lid position, the operator stops the feeding of the first rope 18.

[0065] As shown in FIG. 10, next, the operator removes the stopper 38 from the stopper guide 36. As a result, the columnar member 22 can pass between the stopper guides 36 and descend to the ground G. As the columnar member 22 descends, the weight side cable-like member 40 is pulled toward the columnar member 22 side, and the weight portion 44 is lifted by the weight side cable-like member 40. When the columnar member 22 descends, the force by the weight portion 44 acts as a force in the direction of pulling up the columnar member 22 (a force that resists the descent of the columnar member 22). Thereby, the descending speed of the columnar member 22 can be made slower than the speed at which the columnar member 22 freely falls. Also, the safety when the columnar member 22 descends can be further enhanced.

[0066] As shown in FIG. 10, as the columnar member 22 and the suspension arm 24 descend to the descending position, the suspension arm 24 may be rotated around the columnar member 22 to a position where, as shown by the arrow E, the suspension arm 24 does not interfere with the opening part 8b of the tank body 8 in a top view. Since the columnar member 22 and the suspension arm 24 are rotatable around the central axis B (see FIG. 4), the suspension arm 24 can be easily moved to a position where it is less likely to interfere with the feeding of feed into the opening part 8b. As shown in FIG. 11, after the columnar member 22 and the suspension arm 24 have descended to the descending position, the operator extends the supply part 70 extending from the feed supply vehicle that supplies feed to the feed tank 4 to directly above the opening part 8b. Since the columnar member 22 and the suspension arm 24 are lowered to the lowered position, the supply unit 70 of the feed supply vehicle can be easily extended to the vicinity of the opening portion 8b without interfering with the columnar member 22 and the suspension arm 24. Therefore, the efficiency of the operator's feed loading work can be improved. The supply unit 70 is, for example, a supply arm that is a boom extending from the feed supply vehicle.

[0067] Next, the feed is put into the tank body 8 from the supply unit 70 through the opening portion 8b. When the feeding of the feed is completed, the supply unit 70 is removed from the opening portion 8b. As shown in FIG. 12, the operator raises the columnar member 22 and the suspension arm 24 from the lowered position to the raised position while standing on the ground G. The operator operates the lower lever 22c to lift the lower end portion 22b of the columnar member 22 to a height higher than the stopper guide 36, and then attaches the stopper 38 to the stopper guide 36 and places the columnar member 22 on the stopper portion 16. Therefore, the columnar member 22 and the suspension arm 24 are arranged at the raised position.

[0068] Next, the operator pulls down the lower side of the second rope 19 from the ground G in the pulling-down direction to lower the second rope 19. As shown in FIG. 12, at the start of the pulling-down, the lid 6 is in the open-lid position. In response to the pulling-down of the second rope 19, the handle portion 6b of the lid 6 is pulled upward toward the fifth guide 61 of the suspension arm 24, and the lid 6 is gradually lifted and moved in the closing direction. At this time, the lid 6 is in a state of being suspended by the second rope 19 extending from the suspension arm 24.

[0069] As shown in FIG. 13, in response to the pulling-down of the second rope 19, the lid 6 is gradually closed, and the tip portion 6a and the handle portion 6b of the lid 6 can be closed to a side further closed than above the hinge portion 12 (the side closer to the opening portion 8b than the hinge portion 12). At this time, the columnar member 22 is located outside the hinge portion 12. The lid 6 is pulled upward by the second rope 19 toward the suspension arm 24 and closed to the side of the opening portion 8b above the hinge portion 12. After the tip portion 6a (and the handle portion 6b) of the lid 6 is pulled to the side of the opening portion 8b above the hinge portion 12, the lid 6 can move further to the closing side due to its own weight. Therefore, the operator stops the pulling-down operation of the second rope 19, supports the second rope 19 so as to suppress the second rope 19 from being fed out all at once, and performs a feeding-out operation of gradually feeding out the second rope 19.

[0070] Next, the operator feeds out the second rope 19 while supporting it from the ground G. Thus, the lid 6 is gradually closed. The lid 6 is in a state of being suspended by the second rope 19 extending from the suspension arm 24. At this time, the second rope 19 applies an upward force (pulling force) to the lid 6, preventing the lid 6 from rapidly descending and colliding toward the opening portion 8b of the tank body 8. Therefore, the lid 6 is opened to the open-lid position in the supine state, which is lower than the opening portion 8b of the tank body 8. Therefore, the operator can open the hinged lid 6 to the open-lid position in the supine state, which is less likely to interfere with the supply arm of the feed supply vehicle that supplies feed to the opening portion 8b at the top of the feed tank 4, that is, the boom. Thus, the workability of the operator's feed supply work can be improved. In addition, the lid opening / closing device of the feed tank 4 can be configured to be relatively easily assembled to the support legs of the feed tank 4. For example, it is easy to arrange the lid opening / closing device 1 of the feed tank 4 that opens and closes the lid 6 suspended by the first rope 18 in a state of closing the opening portion 8b of the relatively large feed tank 4, and the installation cost can be reduced. Further, since the lid opening / closing device 1 of the feed tank 4 is stably assembled to the feed tank 4, a stable and safe lid opening / closing device 1 of the feed tank 4 can be provided for the operator.

[0071] According to an embodiment of the present invention configured as described above, when the column 14 with a suspension arm is disposed on the stopper portion 16 and the upper end of the column 14 with a suspension arm is disposed at the upper position, an operator operates the first rope 18 from below the feed tank 4, and the lid 6 is suspended by the first rope 18 extending from the column 14 with a suspension arm. In this state, the lid 6 can be opened from the closed lid position closing the opening portion 8b to the supine open lid position at the same height as the opening portion 8b or a position lower than the opening portion 8b. Therefore, by operating from below the feed tank 4, the operator can open the lid 6 to the supine open lid position where it is less likely to interfere with the boom, that is, the supply portion 70 of the feed supply vehicle for supplying feed to the opening portion 8b at the top of the feed tank 4. Thus, the workability of the operator's feed supply work can be improved by a relatively simply configured lid opening / closing device for the feed tank 4. In addition, the lid opening / closing device for the feed tank can be relatively easily assembled to the support legs 10 of the feed tank 4, making it easy to arrange the lid opening / closing device for the feed tank and reducing the installation cost. Furthermore, since the lid opening / closing device for the feed tank is stably assembled to the support legs 10 of the feed tank 4, a stable and safe lid opening / closing device for the feed tank can be provided for the operator. Also, for example, even when the feed tank 4 has a height of several meters, the labor of the operator can be reduced. Also, for example, the high-altitude work of the operator outdoors can be reduced, and the safety of the operator on rainy or snowy days can be further improved.

[0072] Furthermore, according to an embodiment of the present invention, when the column 14 with a suspension arm is disposed on the stopper portion 16, the upper end of the column 14 with a suspension arm is positioned at an upper position above the top of the feed tank 4, and when the support of the column 14 with a suspension arm by the stopper portion 16 is released, the upper end of the column 14 with a suspension arm is positioned at a lower position below the top of the feed tank 4, the column 14 with a suspension arm can be positioned. Therefore, the upper end of the column 14 with a suspension arm is disposed at an upper position above the top of the feed tank 4, and in a state where the lid 6 is suspended by the first rope 18 extending from the column 14 with a suspension arm, the lid 6 can be opened from the closed lid position closing the opening portion 8b to the opened lid position in a supine state where it is less likely to interfere with the arm-shaped supply portion 70. Thus, the workability of the operator's feed supply work can be improved. Further, when feeding the feed into the feed inlet opening at the top of the feed tank 4, the support of the column 14 with a suspension arm by the stopper portion 16 is released, so that the upper end of the column with a suspension arm can be disposed at the lower position. Thus, it is possible to make it less likely that the column 14 with a suspension arm interferes with the supply portion 70 of the feed supply vehicle. Therefore, the workability of the operator's feed supply work can be further improved.

[0073] Furthermore, according to an embodiment of the present invention, when the column 14 with a suspension arm moves downward, the weight portion 44 can act on the column 14 with a suspension arm with an upward force, and when the column 14 with a suspension arm moves upward, the weight portion 44 can act so as to assist the column 14 with a suspension arm with an upward force. Therefore, when the column 14 with a suspension arm moves downward, it is possible to reduce the risk that the column 14 with a suspension arm drops and injures the operator's foot, and when the column 14 with a suspension arm moves upward, it is possible to reduce the force for the operator to lift the column 14 with a suspension arm, and reduce the work load of the operator. Thus, the safety and workability of the work for the operator to move the column 14 with a suspension arm up and down can be further improved.

[0074] Furthermore, according to an embodiment of the present invention, a first weight portion is attached to the first rope 18. When the first rope 18 is pulled in the direction of opening the lid 6 from the state where the lid 6 is closed, the first weight portion applies a force to assist the movement of the first rope 18, which can reduce the force exerted by the operator to pull the first rope 18 and reduce the working load of the operator. Also, when the first rope 18 is further pulled in the opening direction due to the self-weight of the lid 6 from the state where the lid 6 is lifted, the first weight portion applies a force to suppress the movement of the first rope 18 (a force resisting the movement), which can prevent the lid 6 from falling forcefully onto the feed tank 4 and damaging the feed tank 4.

[0075] Furthermore, according to an embodiment of the present invention, a second weight portion 68 is attached to the second rope 19. When the second rope 19 is pulled in the direction of closing the lid 6 from the state where the lid 6 is open, the second weight portion 68 applies a force to assist the movement of the second rope 19, which can reduce the force exerted by the operator to pull the second rope 19 and reduce the working load of the operator. Also, when the second rope 19 is further pulled in the closing direction due to the self-weight of the lid 6 from the state where the lid 6 is lifted, the second weight portion 68 applies a force to suppress the movement of the second rope 19 (a force resisting the movement), which can prevent the lid 6 from falling forcefully onto the opening portion of the feed tank 4 and damaging the feed tank 4.

[0076] Furthermore, according to an embodiment of the present invention, the weight of the support column 14 with a suspension arm is heavier than the weight of the weight portion 44, and the weight of the weight portion 44 is heavier than 70% of the weight of the support column 14 with a suspension arm. Thereby, when the support column 14 with a suspension arm moves downward, the risk of the support column 14 with a suspension arm falling and injuring the operator's foot can be further reduced. When the support column 14 with a suspension arm moves upward, the force required for the operator to lift the support column 14 with a suspension arm can be further reduced, and the working load of the operator can be further reduced.

[0077] Furthermore, according to an embodiment of the present invention, a support leg 10 with a suspension arm support 14 is assembled to a support leg 10 located outside the hinge side of the lid 6, and the lid 6 is suspended by a first rope 18 extending from the suspension arm support 14 with a suspension arm, and the lid 6 is opened and closed. As a result, the lid 6 can be lifted by the first rope 18 from the opening direction of the lid 6, making it easy to improve the efficiency of the force required to open the lid 6 and making it easy to lift it as a stable operation. Therefore, the workability of the operator's feed supply work can be improved.

[0078] Furthermore, according to an embodiment of the present invention, a lid opening and closing system 2 for a feed tank provided with a lid opening and closing device 1 for a feed tank can be provided.

Explanation of Signs

[0079] 1: Lid opening and closing device 2: Lid opening and closing system 4: Feed tank 6: Lid 6a: Tip 6b: Handle part 8: Tank body 8a: Top 8b: Opening part 8c: Discharge port part 10: Support leg 10a: Base 12: Hinge part 14: Suspension arm support 16: Stopper part 17: Guide part 18: First rope 19: Second rope 22: Columnar member 22a: Upper end 22b: Lower end part 22c: Lower lever 22d: Middle lever 24: Suspension arm 24a: Beam member 24b: Slant part 36: Stopper guide 38: Stopper 40: Weight side cable-like member 41: Cable-like member attachment part 42: Guide for weight side cable-like member 44: Weight part 50: First cable-like member guide 51: First guide 52: Second guide 54: Third guide 56: Fourth guide 58: First weight part 60: Second cable-like member guide 61: Fifth guide 62: Sixth guide 63: Seventh guide 64: Eighth guide 66: Ninth guide 68: Second weight part 70: Supply part A: Rotation center axis B: Central axis C: Center D1: Arrow D2: Arrow E: Arrow G: Ground H: Height

Claims

1. A lid opening and closing device for a feed tank, which is assembled to the feed tank provided with a hinge-type lid that opens and closes between an open lid position in a supine state and a closed lid position in a prone state at a feed inlet opening located at the top of the feed tank, wherein the lid opening and closing device of the feed tank is assembled to a support leg that supports the feed tank, and the hinge-type lid is suspended by a first cord member extending from a suspension arm, and the hinge-type lid is moved from the closed lid position in the prone state that closes the feed inlet opening to the open lid position in the supine state at the same height position as the feed inlet opening or at a lower height position than the feed inlet opening. A lid opening and closing device for a feed tank that is opened.

2. The lid opening and closing device of the feed tank, a columnar member provided on the side of the feed tank and a support column with a suspension arm having the suspension arm extending laterally from the upper part of the columnar member, a stopper portion extending laterally from the support leg of the feed tank, a guide portion extending laterally from the support leg above the stopper portion, and at least composed of the first cord member extending from the lower part of the feed tank to the hinge-type lid via the suspension arm, wherein the support column with the suspension arm is arranged on the stopper portion so that the upper end of the support column with the suspension arm is at an upper position above the top of the feed tank, and the support column with the suspension arm is released from the support by the stopper portion. The lid opening and closing device for a feed tank according to claim 1, wherein the upper end of the support column with the suspension arm is formed so as to be positionable at a lower position below the top of the feed tank.

3. Furthermore, a weight-side cord member extending from a cord member attachment portion of the support column with the suspension arm, a guide for the weight-side cord member provided above the cord member attachment portion and for hanging the weight-side cord member, and a weight portion to which the weight-side cord member is attached. The lid opening and closing device for a feed tank according to claim 2.

4. Furthermore, a first weight portion attached to the first cord member, and a first cord member guide for guiding the first cord member to the first weight portion via the suspension arm. The lid opening and closing device for a feed tank according to claim 3.

5. Furthermore, a second cord-like member extending from the lower part of the feed tank to the hinged lid via the suspension arm; a second weight part attached to the second cord-like member; and a second cord-like member guide for guiding the second cord-like member to the second weight part via the suspension arm, the lid opening / closing device for a feed tank according to claim 4. **Claim 6** The weight of the support column with the suspension arm is heavier than the weight of the weight part; The weight of the weight part is heavier than 70% of the weight of the support column with the suspension arm, the lid opening / closing device for a feed tank according to claim 3. **Claim 7** Among the support legs of the feed tank, the support leg to which the support column with the suspension arm is assembled is the support leg located outside the hinge side of the hinged lid, the lid opening / closing device for a feed tank according to claim 2. **Claim 8** A lid opening / closing system for a feed tank, comprising the lid opening / closing device for a feed tank according to any one of claims 1 to 7.

Images