Feed tank and lid opening / closing device

Abstract

To provide a feed tank equipped with a lid opening and closing device that allows the hinged lid to open to a supine position where it is less likely to interfere with the boom of a feed supply vehicle that supplies feed to the opening at the top of the feed tank, and also closes to a closed position where the opening of the feed tank is completely closed when the hinged lid is closed. [Solution] The feed tank 100 includes a lid opening / closing device 130 comprising a shaft portion 131 provided on a shaft portion located near the feed input opening 111 on the side of the tank body 110, a support column portion 135 that supports the shaft portion 131 so as to be able to move up and down in the vertical direction and so as to be able to rotate about a shaft central axis 131g that extends in the vertical direction, a suspension arm portion 132 extending laterally from the upper end portion 131a of the shaft portion 131, and a lid suspension cable portion 134 that connects the suspension arm portion 132 to the hinged lid portion 112.

Description

Technical Field

[0001] The present invention relates to a feed tank, and more particularly to a feed tank provided with an opening / closing device for a hinge-type lid provided on a tank body and the lid opening / closing device thereof.

Background Art

[0002] 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 input opening part, and feed is supplied from the feed supply vehicle into the feed tank. However, in such a feed tank, there is a problem that an operator cannot open and close the lid of the feed input opening provided at the top without climbing to the top of the feed tank, and there is a problem that the boom of the feed supply vehicle may interfere with the lid when feeding the contents into the feed tank, and the approach method of the boom to the feed input opening and the placement location of the feed supply vehicle are limited, resulting in a decrease in work efficiency.

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, since the feed tanks of Patent Document 1 and Patent Document 2 are configured such that the lid opens in a substantially upright state with respect to the feed input opening, there is a risk that the boom of the feed supply vehicle may interfere with the lid when feeding the contents into the feed tank, and the approach method of the boom to the feed input opening and the placement location of the feed supply vehicle are limited, resulting in a decrease in work efficiency.

[0005] To solve this problem, the inventors have developed a feed tank in which the hinged lid is suspended by a cable-like member extending from a suspension arm, and the hinged lid opens from a prone closed position that closes the feed input opening to a supine open position that is at the same height as the feed input opening or at a lower height than the feed input opening.

[0006] Further research by the inventors revealed that in the previously developed invention, when the lid is tightly fitted to the feed input opening of the feed tank after the feeding operation, the lid cannot reach a fully closed position by its own weight alone, resulting in incomplete closure of the feed input opening and potentially raising concerns about the quality of the feed inside the tank.

[0007] Therefore, the present invention solves the problems of the prior art described above, and also resolves the concerns inherent in the inventions previously developed by the inventors. In other words, the object of the present invention is to provide a lid opening and closing device that opens the hinged lid to a supine position where it is less likely to interfere with the boom of a feed supply vehicle that supplies feed to the opening at the top of the feed tank, and closes the hinged lid to a closed position where the opening of the feed tank is completely closed, and a feed tank equipped with such a lid opening and closing device. [Means for solving the problem]

[0008] The invention according to claim 1 is a feed tank comprising a tank body having a feed input opening at the top and a hinged lid that opens and closes the feed input opening between an open position in a supine state and a closed position in a prone state, tank support legs attached to the sides of the lower part of the tank body, and a lid opening and closing device for opening and closing the hinged lid, wherein the lid opening and closing device comprises a shaft portion provided on the side of the tank body near the feed input opening, a support column portion that supports the shaft portion so as to be able to move up and down in the vertical direction and so as to be able to rotate about a shaft central axis extending in the vertical direction, a suspension arm portion extending laterally from the upper end of the shaft portion, and a lid suspension cable portion connecting the suspension arm portion and the hinged lid, thereby solving the aforementioned problems.

[0009] The invention according to claim 2 solves the aforementioned problems by adding, in addition to the configuration of the invention according to claim 1, a push-down rod portion that hangs down from the suspension arm portion and contacts and pushes down the hinged lid portion from above.

[0010] The invention according to claim 3 solves the aforementioned problems by having the suspension arm portion set to a length corresponding to the distance from the shaft portion to the hinged cover portion, in addition to the configuration of the invention according to claim 1 or claim 2.

[0011] The invention according to claim 4 further solves the aforementioned problems by having, in addition to the configuration of the invention according to claim 2, the shaft portion and the support column portion each have a shaft-side contact position indicator mark and a support-side contact position indicator mark, respectively, which indicate a contact position defined by the height and angle when the push-down rod portion contacts the hinged lid portion from above in the closed lid position.

[0012] The invention according to claim 5 further solves the aforementioned problems by adding, in addition to the configuration of the invention according to claim 2, an upper stopper that positions the shaft portion at an upper height position where the upper end of the shaft portion is above the top of the tank body, and a lower stopper that positions the shaft portion at a lower height position where the upper end of the shaft portion is below the top of the feed tank.

[0013] The invention according to claim 6 further solves the aforementioned problems by having an upper guide hole portion that loosely fits the lower end portion of the shaft, in addition to the configuration of the invention according to claim 5.

[0014] The invention according to claim 7 further solves the aforementioned problems by adding to the configuration of the invention according to claim 1 or claim 2 the shaft portion is connected to the weight portion via a weight suspension cable portion attached to the suspension cable attachment portion, and the support column portion is provided with a pulley portion that suspends and supports the weight suspension cable portion above the suspension cable attachment portion.

[0015] The invention according to claim 8 solves the aforementioned problems by adding to the configuration of the invention according to claim 1 or claim 2 the suspension arm portion and the shaft portion are each made of metal.

[0016] The invention according to claim 9 is a lid opening and closing device that can be attached to a feed tank consisting of a tank body and tank support legs attached to the sides of the lower part of the tank body, and opens and closes a hinged lid of a feed input opening provided at the top of the tank body between an open position in a supine state and a closed position in a prone state, wherein the lid opening and closing device comprises a shaft portion provided on the side of the tank body near the feed input opening, a support column portion that supports the shaft portion so as to be able to move up and down in the vertical direction and so as to be able to rotate about a shaft central axis extending in the vertical direction, a suspension arm portion extending laterally from the upper end of the shaft portion, and a lid suspension cable portion connecting the suspension arm portion and the hinged lid portion, thereby solving the aforementioned problems. [Effects of the Invention]

[0017] The feed tank according to claim 1 of the present invention comprises a tank body having a feed input opening at the top and a hinged lid that opens and closes the feed input opening between an open position in a supine state and a closed position in a prone state, tank support legs attached to the sides of the lower part of the tank body, and a lid opening and closing device for opening and closing the hinged lid. This allows for the supply of feed by opening and closing the hinged lid of the feed input opening at the top of the feed tank body between an open position in a supine state and a closed position in a prone state, and also provides unique effects due to the following unique configuration of the present invention.

[0018] In other words, the lid opening and closing device comprises a shaft portion located on the side of the tank body near the feed input opening, a support column portion that supports the shaft portion so that it can move up and down vertically and rotate around a shaft central axis extending vertically, a suspension arm portion extending laterally from the upper end of the shaft portion, and a lid suspension cable portion that connects the suspension arm portion to the hinged lid portion. As a result, the suspension arm portion extending laterally from the upper end of the shaft portion moves up and down in conjunction with the vertical movement and rotation around the shaft central axis, and rotates a large amount around the shaft central axis with a radius equal to the length of the suspension arm portion, and consequently the hinge suspended from the suspension arm via the lid suspension cable portion The hinged lid opens and closes the feed input opening between a supine open position and a prone closed position. This allows the operator to open the lid from the prone closed position to the supine open position, which is less likely to interfere with the feed supply unit (boom), simply by moving the shaft up and down and rotating it around its central axis while standing on the ground, without needing to operate a winch or other hoisting device. Furthermore, after the feed is supplied, the operator can close the lid from the supine open position to the prone closed position, simply by moving the shaft up and down and rotating it around its central axis while standing on the ground, without needing to operate a winch or other hoisting device.

[0019] According to the feed tank of the invention described in claim 2 of the present invention, in addition to the effects of the invention described in claim 1, the lid opening and closing device is equipped with a push-down rod that hangs down from the suspension arm and contacts and pushes down the hinged lid from above. Therefore, when an operator performs a lid closing operation to move the hinged lid from the supine open position to the prone closed position after supplying feed, even if the hinged lid does not fit properly into the feed input opening of the tank body under its own weight and is floating, the operator can move the shaft up and down and rotate it around the central axis of the shaft while standing on the ground, and the push-down rod hanging down from the suspension arm will contact the hinged lid from above. With the push-down rod in contact with the hinged lid from above, the operator can move the hinged lid to the completely prone closed position by simply moving the shaft downward while standing on the ground, thereby ensuring a reliable lid closing operation.

[0020] According to the feed tank of the invention of claim 3, in addition to the effects of the invention of claim 1 or claim 2, the suspension arm portion is set to a length corresponding to the distance from the shaft portion to the hinged lid portion. As a result, when the shaft portion is rotated, the suspension arm portion passes above the hinged lid portion. Therefore, regardless of the position of the hinged lid portion at the top of the tank body, the hinged lid portion can be suspended and opened and closed by the lid suspension cable portion connected to the suspension arm portion.

[0021] According to the feed tank of the invention of claim 4, in addition to the effects of the invention of claim 2, the shaft portion and the support column portion each have a shaft-side contact position indicator mark and a support-side contact position indicator mark, respectively, which indicate the contact position determined by the height and angle at which the push-down rod portion contacts the hinged lid portion from above when it is in the closed position. Therefore, when an operator performs a closing operation to move the hinged lid portion from the open position in the supine position to the closed position in the prone position after the feed has been supplied, the hinged lid portion will be able to withstand the weight of the tank body's feed input opening. If the lid does not fit properly and is floating, the operator can confirm the height and angle position at which the push-down rod, which hangs down from the suspension arm, contacts the hinged lid from above. Therefore, when the operator is standing on the ground and wants to ensure a secure lid closing operation, they can easily position the push-down rod, which hangs down from the suspension arm, to contact the hinged lid from above simply by moving the shaft up and down and rotating it around the shaft's central axis, using the shaft-side contact position indicator and the support-side contact position indicator as references.

[0022] According to the feed tank of the invention according to claim 5, in addition to the effects achieved by the invention according to claim 2, the support column portion includes an upper stopper for positioning the shaft portion at an upper height position where the upper end portion of the shaft portion is above the top of the tank body, and a lower stopper for positioning the shaft portion at a lower height position where the upper end portion of the shaft portion is below the top of the feed tank. As a result, the shaft portion is positioned at an upper height position where the upper end portion of the shaft portion is above the top of the tank body and at a lower height position where the upper end portion of the shaft portion is below the top of the feed tank, respectively. Therefore, when opening and closing the hinged lid portion, the shaft portion is arranged at an upper height position where the upper end portion of the shaft portion is above the top of the tank body, and the lid suspension cable portion connected to the suspension arm portion at the upper end portion of the shaft portion can be used to suspend the hinged lid portion from above to perform the opening and closing operation. In addition, when supplying feed from the feed inlet opening at the top of the tank body, the shaft portion is arranged at a lower height position where the upper end portion of the shaft portion is below the top of the feed tank, and the suspension arm portion can be made less likely to interfere with the feed supply boom of the feed supply vehicle.

[0023] According to the feed tank of the invention according to claim 6, in addition to the effects achieved by the invention according to claim 5, the upper stopper includes an upper guide hole portion for loosely fitting the lower end portion of the shaft portion. As a result, when the shaft portion is positioned at the upper height position, the lower end portion of the shaft portion is held at a certain height by the upper stopper, and the shaft portion rotates. Therefore, when suspending and opening and closing the hinged lid portion by the lid suspension cable portion connected to the suspension arm portion at the upper end portion of the shaft portion, the shaft portion can be stably arranged at the upper height position, and the rotation operation of the shaft portion can be performed without causing axial displacement.

[0024] According to the feed tank of the invention according to claim 7, in addition to the effects achieved by the invention according to claim 1 or claim 2, the shaft portion is provided with a suspension attachment portion and is connected to the weight portion via a weight suspension cable portion attached to this suspension attachment portion, and the support column portion is provided with a pulley portion that suspends and supports the weight suspension cable portion above the suspension attachment portion. When the shaft portion moves downward, the weight portion applies an upward force to the shaft portion via the weight suspension cable, and when the shaft portion moves upward, the weight portion acts to assist the shaft portion by applying an upward force via the weight suspension cable. Therefore, when an operator moves the shaft portion downward, the risk of unexpected accidents such as the shaft portion suddenly descending and injuring the operator's foot can be reduced, and when the operator moves the shaft portion upward, the force required to lift the shaft portion can be reduced, thereby reducing the working load.

[0025] According to the feed tank of the invention according to claim 8, in addition to the effects achieved by the invention according to claim 1 or claim 2, since the suspension arm portion and the shaft portion are each formed of metal, the suspension arm portion and the shaft portion have a rigidity that makes them difficult to deform even when suspending the hinged lid portion, and thus a robust lid opening and closing device that is difficult to deform can be configured even when repeatedly performing the opening and closing operation of the hinged lid portion.

[0026] According to the lid opening and closing device of the invention according to claim 9, it is assembled to be attachable to a feed tank composed of a tank body and a tank support leg attached to the side of the lower part of the tank body, and is a lid opening and closing device that opens and closes the hinged lid portion of the feed inlet opening provided at the top of the tank body between an open lid position in a supine state and a closed lid position in a prone state. Thus, not only can the hinged lid portion of the feed inlet opening provided at the top of the feed tank body be opened and closed between an open lid position in a supine state and a closed lid position in a prone state to supply feed, but also, due to the following configuration specific to the present invention, specific effects can be achieved.

[0027] In other words, the lid opening and closing device comprises a shaft portion located on the side of the tank body near the feed input opening, a support column portion that supports the shaft portion so that it can move up and down vertically and rotate around a shaft central axis extending vertically, a suspension arm portion extending laterally from the upper end of the shaft portion, and a lid suspension cable portion that connects the suspension arm portion to the hinged lid portion. As a result, the suspension arm portion extending laterally from the upper end of the shaft portion moves up and down in conjunction with the vertical movement and rotation around the shaft central axis, and rotates a large amount around the shaft central axis with a radius equal to the length of the suspension arm portion, and consequently the hinge suspended from the suspension arm via the lid suspension cable portion The hinged lid opens and closes the feed input opening between a supine open position and a prone closed position. This allows the operator to open the lid from the prone closed position to the supine open position, which is less likely to interfere with the feed supply unit (boom), simply by moving the shaft up and down and rotating it around its central axis while standing on the ground, without needing to operate a winch or other hoisting device. Furthermore, after the feed is supplied, the operator can close the lid from the supine open position to the prone closed position, simply by moving the shaft up and down and rotating it around its central axis while standing on the ground, without needing to operate a winch or other hoisting device. [Brief explanation of the drawing]

[0028] [Figure 1] A schematic perspective view showing the closed lid state of the feed tank according to the present invention. [Figure 2] A schematic diagram showing the suspension arm and push-down rod of the lid opening and closing device according to the present invention. [Figure 3] A schematic front view showing the closed lid state of the feed tank according to the present invention. [Figure 4] A schematic plan view showing the closed lid state of the feed tank according to the present invention. [Figure 5] A schematic perspective view of the portion corresponding to A in Figure 3 when the shaft portion according to the present invention is at the lower height position. [Figure 6]A schematic diagram of the operation of the part corresponding to A in Figure 3 when moving the shaft portion according to the present invention. [Figure 7] A schematic front view showing the state in which the hinged lid portion according to the present invention has begun to open. [Figure 8] A schematic diagram of the operation of the part corresponding to A in Figure 3 when moving the shaft portion according to the present invention. [Figure 9] Schematic diagram of the operation of the suspension arm and hinged lid corresponding to the operation in Figure 8. [Figure 10] A schematic diagram showing how the hinged lid according to the present invention moves from a closed state to an open state. [Figure 11] A schematic perspective view showing how feed is supplied to a feed tank according to the present invention. [Figure 12] A schematic diagram showing the operation of the suspension arm portion when the hinged lid portion according to the present invention moves from an open state to a closed state. [Figure 13] A schematic diagram of the operation of the part corresponding to A in Figure 3 when the push-down rod according to the present invention comes into contact with the hinged lid. [Figure 14] A schematic perspective view of the portion corresponding to B in Figure 15 when the push-down rod according to the present invention contacts the hinged lid. [Figure 15] A schematic front view showing the push-down rod according to the present invention in contact with a hinged lid. [Modes for carrying out the invention]

[0029] The present invention provides a lid opening and closing device comprising a shaft portion provided on the side of the tank body near the feed input opening, a support column portion that supports the shaft portion so as to be able to move up and down vertically and rotate around a shaft central axis extending vertically, a suspension arm portion extending laterally from the upper end of the shaft portion, and a lid suspension cable portion connecting the suspension arm portion and the hinged lid portion, which allows the hinged lid to be opened to a supine position where it is less likely to interfere with the boom of a feed supply vehicle that supplies feed to the opening at the top of the feed tank when the lid is opened, and to be closed to a closed position where the opening of the feed tank is completely closed when the hinged lid is closed. Any specific embodiment of the present invention is acceptable as long as it is able to open to a supine position where it is less likely to interfere with the boom of a feed supply vehicle that supplies feed to the opening at the top of the feed tank when the lid is opened, and close to a closed position where the opening of the feed tank is completely closed when the lid is closed.

[0030] For example, the suspension cable that suspends the hinged lid or weight can be made of a flexible cable-like member, such as a string, cable, wire, belt, or chain. Furthermore, while the shaft and suspension arm can be made of stainless steel, they are not limited to stainless steel and can be made of iron, iron-based alloys, or various other metal materials.

[0031] The feed supplied and stored in the tank can be a wide variety of feeds and feed ingredients for livestock such as dairy cows, beef cattle, or pigs, or poultry such as laying hens or broilers. Specifically, grains such as rice, wheat, corn, soybeans, okara (soybean pulp), rice hulls, rice bran, or buckwheat hulls, and their processed products, can be selected. However, the stored materials are not limited to feeds and feed ingredients; various raw materials in powder, granular, or pellet form, such as wood pellets, wood chips, or plastic pellets, may also be stored. [Examples]

[0032] Below, an embodiment of the present invention, a feed tank, will be described with reference to Figures 1 to 15. Here, Figure 1 is a schematic perspective view showing the closed state of the feed tank according to the present invention, Figure 2 is a schematic diagram showing the suspension arm and push-down rod of the lid opening and closing device according to the present invention, Figure 3 is a schematic front view showing the closed state of the feed tank according to the present invention, Figure 4 is a schematic plan view showing the closed state of the feed tank according to the present invention, Figure 5 is a schematic perspective view of the part corresponding to A in Figure 3 when the shaft part according to the present invention is at the lower height position, Figure 6 is a schematic operation diagram of the part corresponding to A in Figure 3 when the shaft part according to the present invention is moved, Figure 7 is a schematic front view showing the state in which the hinged lid part according to the present invention has begun to open, Figure 8 is a schematic operation diagram of the part corresponding to A in Figure 3 when the shaft part according to the present invention is moved, and Figure 9 is the operation in Figure 8. Figure 10 is a schematic operation diagram of the corresponding suspension arm and hinged lid, Figure 11 is a schematic perspective view showing how feed is supplied to the feed tank according to the present invention, Figure 12 is a schematic operation diagram showing the state of the suspension arm when the hinged lid according to the present invention moves from the open state to the closed state, Figure 13 is a schematic operation diagram of the part corresponding to A in Figure 3 when the push-down rod according to the present invention contacts the hinged lid, Figure 14 is a schematic perspective view of the part corresponding to B in Figure 15 when the push-down rod according to the present invention contacts the hinged lid, and Figure 15 is a schematic front view showing the push-down rod according to the present invention in contact with the hinged lid.

[0033] First, the configuration of the feed tank 100 according to this embodiment will be explained with reference to Figures 1 to 4 and Figure 10, etc. The feed tank 100 according to this embodiment comprises a hollow cylindrical tank body 110, tank support legs 120 fixed to the lower side of the tank body 110, and a lid opening and closing device 130 fixed to the side of the tank body 110.

[0034] The tank body 110 has a dome-shaped top 110a, which is equipped with a feed input opening 111 for introducing feed into the top 110a, and a hinged lid 112 that covers the feed input opening 111 and opens and closes. Furthermore, it is equipped with an outlet 113 at the bottom for discharging feed.

[0035] The tank body 110 is made of resin such as fiber-reinforced plastic (FRP) and is mainly placed outdoors to store livestock feed, such as granular compound feed. The height from the ground to the top 110a of the tank body 110 is approximately 3m to 10m, and it may be configured so that workers can climb to the top 110a using a ladder (not shown).

[0036] As shown in Figure 10, the feed input opening 111 is formed in a short cylindrical shape and opens upward.

[0037] As shown in Figures 1 and 3, the hinged lid 112 is formed in a generally circular dome shape, slightly larger than the short cylindrical feed input opening 111, and with a dome shape in which the height of the central part is greater than the height of the edge. The hinged lid 112 is pivoted to rotate around a substantially horizontal hinge pivot axis 112c of the hinge portion 112b located near the feed input opening 111, and is configured to open and close freely between the open lid position in the supine state shown in Figure 10 and the closed lid position in the prone state shown in Figure 4. The hinged lid lid 112 has a lid suspension cable attachment portion 134, which will be described later, attached to the lid side suspension cable attachment portion 112a, which is located at the position furthest from the hinge portion 112b. The hinged lid 112 is made of a metal such as iron and has a weight in the range of approximately 3 kg to 7 kg, for example, 4.5 kg.

[0038] The tank support legs 120 are made up of rod-shaped members that are embedded in concrete foundation blocks B constructed in the ground and extend to the side of the tank body 110, and are installed on the ground G, attached to the side of the lower part of the tank body 110 to support the tank body 110. Note that the ground level G is omitted in some of the drawings.

[0039] The lid opening and closing device 130 is a device for opening and closing a hinged lid 112, and is assembled to be attachable to the tank body 110 and the tank support legs 120. It comprises a shaft portion 131, which is a straight rod-shaped member provided on the side of the tank body 110; a suspension arm portion 132 extending laterally from the shaft portion 131; a push-down rod portion 133 hanging down from the suspension arm portion 132; a lid suspension cable portion 134 connected to the suspension arm portion 132; a support column portion 135 that supports the shaft portion 131 so that it can move up and down and rotate; and a pulley portion 136 that suspends and supports the weight suspension cable portion 137 attached to the weight portion 138.

[0040] The shaft portion 131 and the suspension arm portion 132 are made of stainless steel, and the combined weight of the shaft portion 131 and the suspension arm portion 132 can be set to a weight within the range of 8 kg to 13 kg. In this embodiment, it is approximately 13 kg.

[0041] As shown in Figure 4, the shaft portion 131 is vertically mounted near the extension of the hinge pivot axis 112c of the hinge portion 112b of the hinged lid portion 112, and extends vertically. It is positioned within the shaft guide 135d of the support column portion 135 (described later) so as to be able to move up and down and rotate around the vertically extending shaft central axis 131g. The shaft portion 131 is also located near the feed input opening 111 on the side of the tank body 110 and has a length corresponding to the height from the ground G to the feed input opening 111 of the tank body 110, for example, a length in the range of 3m to 8m.

[0042] As shown in Figure 2, the shaft portion 131 is integrated with a suspension arm portion 132 that extends laterally from its upper end portion 131a, and as shown in Figure 5, it is equipped with a lower lever 131d that protrudes laterally near its lower end portion 131b.

[0043] As shown in Figures 6 and 7, when suspending the hinged lid 112, the shaft portion 131 is configured such that, at the upper height position, its upper end portion 131a is positioned above the hinged lid 112, and the lower lever 131d, located near its lower end portion 131b, is positioned to rest on the upper stopper 135a, which will be described later. Furthermore, as shown in Figures 8, 9, and 11, when feed is introduced into the feed input opening 111, the shaft portion 131 is configured such that, at the lower height position, its upper end portion 131a is located at approximately the same height as or below the hinged lid portion 112, and the lower lever 131d, provided near its lower end portion 131b, is positioned to rest on the lower stopper 135b. In other words, the shaft portion 131 is formed to be the same length as or shorter than the distance from the hinged lid portion 112 of the tank body 110 to the ground G.

[0044] The shaft portion 131 is further equipped with an upper lever 131c that protrudes laterally from the lower end portion 131b at a height of approximately 1m to 1.5m.

[0045] As shown in Figures 5 and 8, the shaft section 131 is equipped with an upper lever 131c and a lower lever 131d. Therefore, when the shaft section 131 is in the upper height position, the operator can operate the shaft section 131 by gripping the lower lever 131d to raise, lower, and rotate the shaft section 131, and when the shaft section 131 is in the lower height position, the operator can operate the shaft section 131 by gripping the upper lever 131c to raise, lower, and rotate the shaft section 131, thus avoiding an awkward posture.

[0046] The shaft portion 131 is further provided with a shaft-side suspension rope attachment portion 131e that extends laterally from the shaft portion 131 and forms an annular structure at its distal end relative to the shaft portion 131, as shown in Figures 5 and 8, and the weight suspension rope portion 137, which will be described later, is attached to this shaft-side suspension rope attachment portion 131e. The shaft portion 131 has a shaft-side contact position indicator mark 131f that indicates a contact position defined by the height and angle at which the push-down rod portion 133, described later, contacts the hinged lid portion 112 in the closed position from above.

[0047] As shown in Figure 2, the suspension arm portion 132 extends laterally from the upper end portion 131a of the shaft portion 131 toward the inside of the tank body 110. It is composed of a beam member 132a that extends at a slight elevation angle and a diagonal member 132b that diagonally connects and supports the middle portion of the beam member 132a and the shaft portion 131. It forms a crane-like structure that is integrated with the shaft portion 131 and can rotate around the shaft central axis 131g, and extends from the side of the tank body 110 to above the feed input opening 111.

[0048] In other words, the suspension arm portion 132 is set to a length corresponding to the distance from the shaft portion 131 to the hinged cover portion 112.

[0049] As shown in Figure 7, the suspension arm portion 132 is equipped with an arm-side suspension cable attachment portion 132c at its distal end relative to the shaft portion 131, and is connected to the hinged lid portion 112 via a lid suspension cable portion 134, which will be described later, attached to this arm-side suspension cable attachment portion 132c.

[0050] The suspension arm portion 132 is configured to rotate integrally with the shaft portion 131 so that it is directed toward the closed position when the hinged lid portion 112 is in the closed position, and directed toward the open position when the hinged lid portion 112 is in the open position.

[0051] As shown in Figure 15, the push-down rod portion 133 is formed in the shape of an upright rod and is attached to the distal end of the suspension arm portion 132 relative to the shaft portion 131, hanging down from the suspension arm portion 132. As shown in Figure 14, the shaft-side contact position indicator mark 131f and the support-side contact position indicator mark 135c (described later) are aligned, and the rod is configured to contact the hinged lid portion 112 in the closed position from above when the shaft portion 131 is at the height and angle position corresponding to the contact position.

[0052] As shown in Figure 7, the lid suspension cable portion 134 is formed in a flexible and deformable cable shape, with one end attached to the lid-side suspension cable attachment portion 112a of the hinged lid portion 112, and the other end attached to the arm-side suspension cable attachment portion 132c of the suspension arm portion 132, thereby connecting the hinged lid portion 112 and the suspension arm portion 132.

[0053] The support column 135 is configured to support the shaft 131 so that it can move up and down and rotate freely. The support column 135 is embedded in a concrete foundation block B constructed in the ground, forming a fixed column that extends upward from the ground G, and is further connected to the tank support leg 120 by a fixed rod 135e. The support column 135 is made of a metal pole such as iron with a larger diameter than the shaft 131.

[0054] The support column 135 is equipped with a plurality of shaft guides 135d along its longitudinal direction, and the shaft portion 131 is inserted and positioned within these shaft guides 135d, thereby supporting the shaft portion 131 so that it can move up and down in the vertical direction and rotate around the shaft central axis 131g that extends in the vertical direction.

[0055] The support column 135 includes an upper stopper 135a that positions the shaft portion 131 at an upper height position where the upper end portion 131a of the shaft portion 131 is above the top portion 110a of the tank body 110, and a lower stopper 135b that positions the shaft portion 131 at a lower height position where the upper end portion 131a of the shaft portion 131 is below the top portion 110a of the tank body 110.

[0056] The upper stopper 135a is a roughly rectangular plate-shaped support base with downward-facing edges on both sides, and is pivotally positioned at a height lower than approximately 1.5m above the ground, allowing it to move freely between a horizontal and a vertical position. The upper stopper 135a has an upper guide hole portion 135aa that loosely fits the lower end portion 131b of the shaft portion 131, preventing the shaft central axis 131g from wobbling. As shown in Figures 6 and 7, the upper stopper 135a allows the shaft portion 131 to rotate freely in the horizontal position and holds the shaft portion 131 at the upper height position. On the other hand, as shown in Figures 5 and 13, when the upper stopper 135a is in the vertical position, it does not interfere with the shaft portion 131, so the shaft portion 131 can be moved between the upper height position and the lower height position.

[0057] The lower stopper 135b is a roughly rectangular plate-shaped support base with upward-facing edges on all four sides, and is fixed horizontally at a height directly above the ground G. The lower stopper 135b has a lower guide hole portion 135ab that loosely fits the lower end portion 131b of the shaft portion 131 to prevent the shaft central axis 131g from wobbling, and as shown in Figures 5 and 8, the shaft portion 131 is placed on it and held in the lower height position. As shown in Figures 5 and 8, the lower stopper 135b is equipped with lower lever fitting slits 135bb at two locations on the left and right sides of the front of the upward-facing edge, into which the lower lever 131d is fitted to prevent unnecessary rotation of the shaft portion 131.

[0058] The support column portion 135 has a support-side contact position indicator mark 135c that indicates a contact position defined by the height and angle at which the push-down rod portion 133 contacts the hinged lid portion 112 from above when it is in the closed position. As shown in Figure 14, when the support-side contact position indicator mark 135c and the shaft-side contact position indicator mark 131f are aligned and the shaft portion 131 is set to the height and angle corresponding to the contact position, the push-down rod portion 133 is configured to contact the hinged lid portion 112 from above, as shown in Figure 15. Furthermore, as shown in Figures 5 and 6, the support column 135 is equipped with a weight guide 135f that extends laterally from the support column 135 and has an annular structure, which guides the weight 138 (described later) so that it can move up and down within the annular structure.

[0059] As shown in Figure 11, the pulley section 136 suspends and supports the weight suspension cable section 137. One end of the weight suspension cable section 137 is attached to the weight-side suspension cable attachment portion 138a of the weight section 138, and the other end is attached to the shaft-side suspension cable attachment portion 131e, which is located lower than the pulley section 136 of the shaft section 131, as shown in Figure 10. The weight suspension cable section 137 extends from the shaft-side suspension cable attachment portion 131e, through the pulley section 136, and then folds downward again to the weight section 138. In other words, the shaft portion 131 is connected to the weight portion via a weight suspension cable portion 137 attached to the suspension cable attachment portion 131e, and the support column portion 135 is equipped with a pulley portion 136 that suspends and supports the weight suspension cable portion 137 above the suspension cable attachment portion 131e of the shaft portion 131.

[0060] As shown in Figures 5 and 6, the weight portion 138 is formed in a cylindrical shape and is guided to move up and down freely inside the annular structure of the weight guide 135f. The weight of the weight portion 138 is set to be between 70% and 100% of the total weight of the shaft portion 131 and the suspension arm portion 132, and more specifically, it has a weight in the range of 6 kg to 12 kg. In this embodiment, it is approximately 10 kg.

[0061] Next, with reference to Figures 1 to 15, the opening operation of the hinged lid 112 of the feed tank 100 according to this embodiment will be described.

[0062] First, in the state before work begins, as shown in Figure 3, the hinged lid 112 is in the inverted closed position, and the feed input opening 111 of the tank body 110 is closed by the hinged lid 112. Furthermore, the shaft portion 131 of the lid opening / closing device 130 is located at the lower height position, and as shown in Figure 5, the height position of the shaft portion 131 is restricted by the lower stopper 135b. At this time, the lower lever 131d is fitted into the lower lever fitting slit 135bb on the left side in a front view.

[0063] Next, in order for the operator to open the hinged lid 112, as shown by the dashed line in Figure 6, the operator grasps the upper lever 131c and lifts it until the lower lever 131d is slightly higher than the upper stopper 135a, while simultaneously raising and lowering the upright upper stopper 135a to a horizontal position, and then places the shaft 131 on the upper stopper 135a. At this time, as shown by the solid line in Figure 6, the lower end portion 131b of the shaft portion 131 is loosely fitted into the upper guide hole portion 135aa of the upper stopper 135a, and the lower lever 131d, which is located near the lower end portion 131b of the shaft portion 131, is placed on the upper stopper 135a.

[0064] Furthermore, when an operator moves the shaft portion 131 upward, the weight portion 138 acts to assist the shaft portion 131 with an upward force via the weight suspension cable portion 137, thereby reducing the effort required.

[0065] In conjunction with this operation, as shown in Figure 7, the shaft portion 131 located to the side of the hinge portion 112b moves to the upper height position, causing the upper end portion 131a of the shaft portion 131 to move to a position higher than the height of the hinged lid portion 112, and at the same time, the suspension arm portion 132 is positioned above the feed input opening 111. As a result, the hinged lid 112, which is connected to the suspension arm 132 via the lid suspension cable portion 134, has its lid-side suspension cable attachment portion 112a, to which the lid suspension cable portion 134 is attached, pulled upward. This causes the lid to rotate upward from the prone closed position around the hinge pivot axis 112c of the hinge portion 112b, resulting in a slightly open state where it is suspended from the suspension arm 132 via the lid suspension cable portion 134.

[0066] Next, as shown by the dashed line in Figure 8, with the lower end portion 131b of the shaft portion 131 loosely fitted into the upper guide hole portion 135aa of the upper stopper 135a, the lower lever 131d, which is placed on the upper stopper 135a, is rotated counterclockwise in a plan view (from left to right in a front view). In response, the shaft portion 131 also rotates around its central axis 131g while maintaining its position at the upper height.

[0067] At this time, the suspension arm portion 132, which is integrally configured with the shaft portion 131, also rotates counterclockwise in a plan view (from right to left in a front view) while maintaining its position at the upper height, as shown by the dashed line in Figure 9.

[0068] Here, the shaft portion 131 is positioned near the feed input opening 111 on the side of the tank body 110, and is suspended near the extension of the hinge pivot axis 112c of the hinge portion 112b of the hinged lid portion 112. The suspension arm portion 132 extends laterally from the upper end portion 131a of the shaft portion 131 toward the inside of the tank body 110, forming a crane-like structure that can rotate integrally with the shaft portion 131, and extends from the side of the tank body 110 to above the feed input opening 111.

[0069] In this configuration, when the suspension arm 132 rotates counterclockwise in a plan view (right to left in a front view) while maintaining its position at the upper height, the suspension arm 132 passes directly over the hinge portion 112b, and a force acts to pull up the hinged lid portion 112 via the lid suspension cable portion 134 attached to the arm-side suspension cable attachment portion 132c. Since this force pulling up the hinged lid portion 112 includes an upward component that is perpendicular to the hinge rotation axis 112c, a rotational moment about the hinge rotation axis 112c acts on the hinged lid portion 112, causing the hinged lid portion 112 to rotate in a direction that opens wider, and it opens beyond the upright position to the supine open position.

[0070] Subsequently, as shown by the dashed line in Figure 8, the worker grasps the lower lever 131d and lifts it until it is slightly higher than the upper stopper 135a. While doing so, the worker raises and lowers the horizontal upper stopper 135a to an upright position, then lowers the shaft portion 131 and places it on the lower stopper 135b, positioning it at the lower height.

[0071] At this time, the worker positions the lower end portion 131b of the shaft portion 131 so as to be loosely fitted into the lower guide hole portion 135ba of the lower stopper 135b, as shown by the solid line in Figure 8, and also fits the lower lever 131d into the lower lever fitting slit 135bb on the right side when viewed from the front, thereby preventing unnecessary rotation of the shaft portion 131.

[0072] Furthermore, when the worker moves the shaft section 131 downward, the weight section 138 applies an upward force to the shaft section 131 via the weight suspension cable section 137, so that the shaft section 131 descends safely at a speed slower than the speed at which it would free-fall.

[0073] As a result of the series of operations in which the shaft portion 131 is lowered from the upper height position to the lower height position, the upper end portion 131a of the shaft portion 131 moves to a position lower than the height of the feed input opening 111, as shown by the solid line in Figure 9, and at the same time, the suspension arm portion 132 is also positioned lower than the height of the feed input opening 111. As a result of this operation, as shown in Figure 10, the hinged lid portion 112 opens completely to the supine open position, and the configuration around the feed input opening 111 is arranged so as not to obstruct the supply of feed.

[0074] Subsequently, as shown in Figure 11, the worker extends the feed supply boom SA, which extends from the feed supply vehicle that supplies feed to the tank body 110, to directly above the feed input opening 111 to supply feed. However, since the shaft portion 131 is lowered to a lower height position, the feed supply boom SA of the feed supply vehicle, the shaft portion 131, and the suspension arm portion 132 do not interfere with each other.

[0075] Next, the feed is fed from the feed supply boom SA through the feed input opening 111 into the tank body 110. Once the feed has been fed, the feed supply boom SA is removed from the feed input opening 111.

[0076] Next, with reference to Figures 1 to 15, the closing operation of the hinged lid 112 of the feed tank 100 according to this embodiment will be explained.

[0077] Once the feed has been added, as shown by the solid line in Figure 9 and in Figure 10, the hinged lid 112 is in the supine open position, and the feed input opening 111 of the tank body 110 is completely open. Furthermore, the shaft portion 131 of the lid opening / closing device 130 is located at the lower height position, and the height position of the shaft portion 131 is restricted by the lower stopper 135b. At this time, the lower lever 131d is fitted into the lower lever fitting slit 135bb on the right side when viewed from the front.

[0078] Next, in order for the operator to close the hinged lid 112, they follow the reverse procedure of opening the lid: they grasp the upper lever 131c and lift it until the lower lever 131d is slightly higher than the upper stopper 135a, while simultaneously raising and lowering the upright upper stopper 135a to a horizontal position, and then place the shaft 131 on the upper stopper 135a. At this time, the lower end portion 131b of the shaft portion 131 is loosely fitted into the upper guide hole portion 135aa of the upper stopper 135a, and the lower lever 131d, which is located near the lower end portion 131b of the shaft portion 131, is placed on the upper stopper 135a.

[0079] In conjunction with this operation, as shown by the dashed line in Figure 12, the shaft portion 131 located to the side of the hinge portion 112b moves to the upper height position, causing the upper end portion 131a of the shaft portion 131 to move to a position higher than the height of the hinged lid portion 112, and at the same time, the suspension arm portion 132 is positioned above the feed input opening 111. As a result, the hinged lid 112, which is connected to the suspension arm 132 via the lid suspension cable portion 134, has its lid-side suspension cable attachment portion 112a, to which the lid suspension cable portion 134 is attached, pulled upward. This causes it to rotate upward from the supine open position around the hinge pivot axis 112c of the hinge portion 112b, and it ends up suspended from the suspension arm 132 via the lid suspension cable portion 134.

[0080] Next, with the lower end portion 131b of the shaft portion 131 loosely fitted into the upper guide hole portion 135aa of the upper stopper 135a, the lower lever 131d, which is placed on the upper stopper 135a, is rotated clockwise in a plan view (from right to left in a front view). In response, the shaft portion 131 also rotates around its central axis 131g while maintaining its position at the upper height.

[0081] At this time, as shown in Figure 12, the suspension arm portion 132, which is integrally configured with the shaft portion 131, also rotates clockwise in a plan view (from left to right in a front view) while maintaining its position at the upper height.

[0082] When the suspension arm 132 rotates clockwise in a plan view (left to right in a front view) while maintaining its position at the upper height, the force pulling up the hinged lid 112 via the lid suspension cable 134 always includes an upward component that is perpendicular to the hinge pivot axis 112c in a twisted position. As a result, the hinged lid 112 rotates in the closing direction around the hinge pivot axis 112c and tilts beyond the upright position towards the closed lid direction.

[0083] At this stage, as shown in Figure 12, the hinged lid 112 is suspended from the suspension arm 132 via the lid suspension cable 134 and is slightly open.

[0084] Subsequently, the worker grasps the lower lever 131d and, as shown by the dashed line in Figure 13, lifts it until it is slightly higher than the upper stopper 135a. While doing so, the worker raises and lowers the horizontal upper stopper 135a to an upright position, and then gradually lowers the shaft 131. This causes the hinged lid 112 to move under its own weight to a position where it closes the feed input opening 111.

[0085] However, during the lid closing operation, if the operator simply moves the shaft portion 131 from the upper height position to the lower height position, there is a concern that the hinged lid portion 112 may not be able to completely close the lid due to its own weight if the fit between the feed input opening 111 and the hinged lid portion 112 is tight.

[0086] Therefore, in the lid closing operation, as shown by the solid line in Figure 13, the lower lever 131d is rotated counterclockwise in a plan view (from left to right in a front view) while the shaft portion 131 is lowered from the upper height position. At this time, as shown in Figure 14, the shaft portion 131 is rotated while being lowered so that the shaft-side contact position indicator mark 131f of the shaft portion 131 coincides with the support-side contact position indicator mark 135c of the support column portion 135 in terms of height and angle.

[0087] As the shaft portion 131 is lowered to a height and angle position where the shaft-side contact position indicator mark 131f of the shaft portion 131 coincides with the support-side contact position indicator mark 135c of the support column portion 135, the push-down rod portion 133 will come into contact with the hinged lid portion 112 in the closed position from above, as shown in Figure 15. At this point, if the operator operates the upper lever 131c or the lower lever 131d to apply a slightly strong downward force to the shaft portion 131, the hinged lid portion 112 can be pushed down to the fully closed position in a prone state, even if the hinged lid portion 112 is not completely closed by its own weight alone.

[0088] Subsequently, the operator lowers the shaft portion 131 to the lower height position, loosely fitting the lower end portion 131b into the lower guide hole portion 135ba of the lower stopper 135b, and fitting the lower lever 131d into the lower lever fitting slit 135bb on the left side when viewed from the front, thereby returning to the closed lid state shown in Figure 3.

[0089] As described above, the feed tank 100 and lid opening / closing device 130 according to this embodiment includes a shaft portion 131 provided on the side of the tank body 110 near the feed input opening 111, a support column portion 135 that supports the shaft portion 131 so that it can move up and down in the vertical direction and rotate around a shaft central axis 131g that extends in the vertical direction, a suspension arm portion 132 extending laterally from the upper end portion 131a of the shaft portion 131, and a lid suspension cable portion 134 that connects the suspension arm portion 132 to the hinged lid portion 112, thereby enabling the operator The operator can perform an opening operation by simply moving the shaft 131 up and down and rotating it around the shaft central axis 131g while standing on the ground, moving the hinged lid 112 from the prone closed position to the supine open position, which is less likely to interfere with the feed supply boom SA. Furthermore, after feed is supplied, the operator can perform a closing operation by simply moving the shaft 131 up and down and rotating it around the shaft central axis 131g while standing on the ground, moving the hinged lid 112 from the supine open position to the prone closed position, without requiring the operation of a hoisting machine such as a winch.

[0090] Furthermore, since the lid opening / closing device 130 is equipped with a push-down rod portion 133 that hangs down from the suspension arm portion 132 and contacts and pushes down the hinged lid portion 112 from above, when the push-down rod portion 133 is in contact with the hinged lid portion 112 from above, the operator can move the hinged lid portion 112 to a fully closed position without requiring the operation of a hoisting machine such as a winch, simply by moving the shaft portion 131 downwards while standing on the ground, thereby ensuring a reliable lid closing operation.

[0091] Furthermore, since the suspension arm portion 132 is set to a length corresponding to the distance from the shaft portion 131 to the hinged lid portion 112, when the shaft portion 131 is rotated, the suspension arm portion 132 passes above the hinged lid portion 112. Therefore, regardless of the position of the hinged lid portion 112 on the top portion 110a of the tank body 110, the hinged lid portion 112 can be suspended and opened and closed by the lid suspension cable portion 134 connected to the suspension arm portion 132.

[0092] Furthermore, since the shaft portion 131 and the support column portion 135 each have a shaft-side contact position indicator mark 131f and a support-side contact position indicator mark 153c, respectively, which indicate the contact position determined by the height and angle at which the push-down rod portion 133 contacts the hinged lid portion 112 from above when it is in the closed position, when an operator is standing on the ground, it is easy to position the push-down rod portion 133, which hangs down from the suspension arm portion 132, to contact the hinged lid portion 112 from above simply by moving the shaft portion up and down and rotating it around the shaft's central axis, based on the shaft-side contact position indicator mark 131f and the support-side contact position indicator mark 153c, when an operator is standing on the ground and wants to ensure a secure lid closing operation, the operator can easily position the push-down rod portion 133, which hangs down from the suspension arm portion 132, to contact the hinged lid portion 112 from above.

[0093] In addition, the support column 135 is equipped with an upper stopper 135a that positions the shaft portion 131 at an upper height position where the upper end portion 131a of the shaft portion 131 is above the top portion 110a of the tank body 110, and a lower stopper 135b that positions the shaft portion at a lower height position where the upper end portion 131a of the shaft portion 131 is below the top portion 110a of the tank body 110. As a result, when opening and closing the hinged lid portion 112, the upper end portion 131a of the shaft portion 131 is positioned at an upper height position above the top portion 110a of the tank body 110. By positioning the shaft portion 131 and connecting the lid suspension cable portion 134 to the suspension arm portion 132 located at the upper end portion 131a of the shaft portion 131, the hinged lid portion 112 can be suspended from above and opened and closed. In addition, when supplying feed from the feed input opening 111 at the top portion 110a of the tank body 110, the shaft portion 131 is positioned at a lower height position where the upper end portion 131a of the shaft portion 131 is below the top portion 110a of the tank body 110, making it less likely for the suspension arm portion 132 to interfere with the feed supply boom SA of the feed supply vehicle.

[0094] Furthermore, since the upper stopper 135a is equipped with an upper guide hole portion 135aa that loosely fits the lower end portion 131b of the shaft portion 131, when the hinged lid portion 112 is suspended by the lid suspension cable portion 134 connected to the suspension arm portion 132 at the upper end portion 131a of the shaft portion 131 and opened and closed, the shaft portion 131 can be rotated without causing axial wobble while the shaft portion 131 is stably positioned at the upper height.

[0095] Furthermore, the shaft portion 131 is equipped with a suspension cable attachment portion 131e and is connected to the weight portion 138 via a weight suspension cable portion 137 attached to this suspension cable attachment portion 131e, and the support column portion 135 is equipped with a pulley portion 136 that suspends and supports the weight suspension cable portion 137 above the suspension cable attachment portion 131e. As a result, when a worker moves the shaft portion 131 downward, the risk of unforeseen accidents such as the shaft portion 131 suddenly descending and injuring the worker's feet can be reduced, and when a worker moves the shaft portion 131 upward, the force required to lift the shaft portion 131 can be reduced, thereby reducing the workload.

[0096] Furthermore, since the suspension arm portion 132 and the shaft portion 131 are each made of metal, the suspension arm portion 132 and the shaft portion 131 have the rigidity to resist deformation even when the hinged lid portion 112 is suspended from them. As a result, a robust lid opening and closing device 130 can be constructed that resists deformation even when the hinged lid portion 112 is repeatedly opened and closed.

[0097] In addition to these, the lid opening / closing device 130 can be attached to a feed tank 100 consisting of a tank body 110 and tank support legs 120 attached to the sides of the lower part of the tank body 110, and can be a lid opening / closing device 130 that opens and closes the hinged lid portion 112 of the feed input opening 111 provided on the top portion 110a of the tank body 110 between an open position in a supine state and a closed position in a prone state. This lid opening / closing device 130 can consist of a shaft portion 131 provided on the side of the tank body 110 near the feed input opening 111, a support column portion 135 that supports the shaft portion 131 so that it can move up and down in the vertical direction and rotate around a shaft central axis 131g that extends in the vertical direction, and a suspension arm portion 132 that extends laterally from the upper end portion 131a of the shaft portion 131, By providing a lid suspension cable 134 that connects the suspension arm 132 and the hinged lid 112, the operator can open the lid from the prone closed position to the supine open position, which is less likely to interfere with the feed supply unit (boom), simply by moving the shaft 131 up and down and rotating it around the shaft central axis 131g while standing on the ground, without needing to operate a hoisting machine such as a winch. Furthermore, after the feed is supplied, the operator can close the lid from the supine open position to the prone closed position, simply by moving the shaft 131 up and down and rotating it around the shaft central axis 131g while standing on the ground, without needing to operate a hoisting machine such as a winch. [Explanation of symbols]

[0098] 100 feed tanks 110 Tank body 110a top 111 Feed input opening 112 Hinged lid 112a Lid side sling attachment area 112b Hinge area 112c Hinge pivot axis 113 Discharge port 120 Tank support legs 130 Lid opening and closing device 131 Shaft section 131a Upper end part 131b Lower end part 131c Upper lever 131d Lower lever 131e Shaft-side suspension cable attachment point 131f Shaft-side contact position indicator mark 131g shaft center axis 132 Hanging arm section 132a Beam member 132b Diagonal member 132c Arm-side suspension cable attachment point 133 Push-down rod section 134 Lid suspension cable section 135 Support column section 135a Upper stopper 135aa Upper guide hole area 135b Lower stopper 135ba Lower guide hole area 135bb Lower lever fitting slit 135c Support side contact position indication mark 135d Shaft Guide 135e Fixed rod 135f Weight Guide 136 Pulley section 137 Weight suspension rope section 138 Weight section 138a Attachment point for the suspension cable on the weight side G ground B Concrete foundation block SA supply boom

Claims

1. A feed tank comprising a tank body having a feed input opening at the top and a hinged lid that opens and closes the feed input opening between an open position in a supine state and a closed position in a prone state, tank support legs attached to the sides of the lower part of the tank body, and a lid opening and closing device for opening and closing the hinged lid, The lid opening and closing device comprises a shaft portion provided on the side of the tank body near the feed input opening, A support column supports the shaft portion so that it can move up and down in the vertical direction and rotate around the shaft's central axis extending in the vertical direction, A suspension arm portion extending laterally from the upper end of the shaft portion, A feed tank characterized by comprising a lid suspension cable that connects the suspension arm portion and the hinged lid portion.

2. The feed tank according to claim 1, characterized in that the lid opening and closing device includes a pressing rod portion that hangs down from the suspension arm portion and contacts and pushes down the hinged lid portion from above.

3. The suspension arm portion corresponds to the distance from the shaft portion to the hinged lid portion. A feed tank according to claim 1 or 2, characterized in that it is set to a specific length.

4. The feed tank according to claim 2, characterized in that the shaft portion and the support column portion each have a shaft-side contact position indicator mark and a support-side contact position indicator mark, respectively, which indicate a contact position determined by the height and angle at which the pressing rod portion contacts the hinged lid portion from above when the lid is in the closed position.

5. The support column portion is such that the upper end portion of the shaft portion is higher than the top portion of the tank body. An upper stopper that positions the shaft portion at an upper height position on the side, and the shaft portion The feed tank according to claim 2, further comprising a lower stopper that positions the shaft portion at a lower height position where the upper end portion of the feed tank is below the top of the feed tank.

6. The feed tank according to claim 5, characterized in that the upper stopper has an upper guide hole portion that loosely fits the lower end portion of the shaft.

7. The shaft portion is equipped with a suspension cable attachment portion and is connected to the weight portion via a weight suspension cable portion attached to the suspension cable attachment portion. The feed tank according to claim 1 or 2, characterized in that the support column portion is provided with a pulley portion that suspends and supports the weight suspension cable portion above the suspension cable attachment portion.

8. The feed tank according to claim 1 or 2, characterized in that the suspension arm portion and the shaft portion are each made of metal.

9. A lid opening and closing device that is detachably assembled to a feed tank consisting of a tank body and tank support legs attached to the sides of the lower part of the tank body, and opens and closes the hinged lid of the feed input opening provided at the top of the tank body between an open position in a supine state and a closed position in a prone state, The lid opening and closing device comprises a shaft portion provided on the side of the tank body near the feed input opening, A support column supports the shaft portion so that it can move up and down in the vertical direction and rotate around the shaft's central axis extending in the vertical direction, A suspension arm portion extending laterally from the upper end of the shaft portion, A lid opening and closing device characterized by comprising a lid suspension cable that connects the suspension arm portion and the hinged lid portion.

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