Concrete pump

Abstract

The present invention provides a concrete pump equipped with a hopper mechanism having a lid that is pivotally supported via a pivot shaft so as to be able to open and close the opening of the hopper body, and which can prevent a gap from forming between the hopper body and the lid when viewed in a direction perpendicular to the pivot shaft in a plan view, regardless of whether the hopper body is in an open or closed state. [Solution] The hopper body 511 has a lid 512 that can be opened and closed. The lid 512 is connected to the upper end of the hopper body 511 so as to be vertically rotatable around a pivot axis Z that extends along one side end of itself. The position of the first intersection point P1 on the hopper body 511 side, where the imaginary line L, which is perpendicular to the upper end edge 511a of the hopper body 511 and passes through the pivot axis Z, intersects with one side end of the lid 512 in the open state, is the same as the position of the second intersection point P2 on the hopper body 511 side, where the imaginary line L intersects with one side end of the lid 512 in the closed state.

Description

Technical Field

[0001] The present invention relates to a concrete pump that pumps fresh concrete supplied from a mixer truck or the like to a desired placement site.

Background Art

[0002] Conventionally, there is known a concrete pump that is mounted on, for example, a predetermined work vehicle (concrete pump truck) or the like and pumps fresh concrete supplied from a mixer truck or the like to a desired placement site. The concrete pump mainly includes a hopper device capable of storing fresh concrete, a pump device that sucks the fresh concrete stored in the hopper device and discharges it to the outside, and a concrete pipe communicating with the discharge port of the pump device.

[0003] As disclosed in, for example, Patent Document 1, the hopper device has a hopper (hopper body) with an open upper part and a lid (lid body) capable of opening and closing the opening of the hopper body. The lid body is pivotally supported at the upper end of the front side surface of the hopper body so as to be rotatable up and down. In addition, inside the hopper body, stirring blades are provided to maintain the fluidity of the fresh concrete and guide the fresh concrete to the pump device side.

[0004] During the pumping operation of the fresh concrete by the concrete pump, the hopper device rotates the lid body upward to stand it up and holds the hopper body in an open state. Further, after the completion of the pumping operation or when the concrete pump truck is running, the hopper device rotates the lid body downward to hold the hopper body in a closed state and prevent foreign matter from entering the hopper body.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] In the conventional concrete pump described in Patent Document 1, depending on the configuration of the shaft (rotation shaft) that pivotally supports the lid at the upper end of the front surface of the hopper body, when the hopper body is opened, a gap may occur between the hopper body and the lid when viewed from the front (i.e., in a direction perpendicular to the rotation shaft in a plan view).

[0007] For example, Figures 11(a) and 11(b) show the configuration of a conventional hopper device 251. As shown in these figures, if a pair of pivot shafts 254·254 are fixed along both the left and right sides of one end face (the front end face when the hopper body 252 is closed) 253a of the lid 253, when the lid 253 is rotated upward to open the hopper body 252, a gap D is created between the upper edge 252a of the hopper body 252 and the lower end face (i.e., the one end face 253a) of the lid 253 in a front view. This gap D could cause ready-mixed concrete supplied from a mixer truck or the like to leak out of the hopper body 252.

[0008] The present invention has been made in view of the problems of the current situation described above, and aims to provide a concrete pump equipped with a hopper means having a hopper body with an open top and a lid that is pivotally supported via a pivot shaft so as to be able to open and close the opening of the hopper body, and which can prevent a gap from forming between the hopper body and the lid when viewed in a direction perpendicular to the pivot shaft in a plan view, regardless of whether the hopper body is in an open or closed state. [Means for solving the problem]

[0009] The problems that this invention aims to solve are as described above, and the means for solving these problems will now be explained.

[0010] That is, a concrete pump according to embodiment 1 of the present invention comprises a hopper means capable of storing fresh concrete, and a pump means connected to the hopper means for sucking the fresh concrete in the hopper means and discharging it to the outside, wherein the hopper means has a hopper body with an open top, and a lid that can be moved between an open state with the opening of the hopper body open and a closed state with the opening of the hopper body closed, wherein the lid is connected to the upper end of the hopper body so as to be vertically rotatable about a pivot axis extending along one side end thereof, and the position of the first intersection on the hopper body side where a virtual line perpendicular to the upper end edge of the hopper body and passing through the pivot axis intersects with one side end of the lid in the open state is the same as the position of the second intersection on the hopper body side where the virtual line intersects with one side end of the lid in the closed state. Thus, in the concrete pump according to the present invention, when the lid is rotated upward to stand upright and the opening of the hopper body is opened, the position of the point on one end of the lid that is closest to the upper edge of the hopper body (i.e., the first intersection mentioned above) is the same as when the lid is rotated downward to close the opening of the hopper body, and the position of the point on one end of the lid that is closest to the upper edge of the hopper body (i.e., the second intersection mentioned above) is the same as when the lid is rotated downward to close the opening of the hopper body. In other words, whether the hopper body is open or closed, the position of the point on one end of the lid that is closest to the upper edge of the hopper body remains the same. Therefore, according to the concrete pump of the present invention, the lid can be pivotally supported on the hopper body so that, regardless of whether the hopper body is in an open or closed state, there is no gap between the hopper body and the lid when viewed from the front (i.e., in a direction perpendicular to the rotation axis in a plan view). As a result, even when supplying ready-mix concrete from a mixer truck or the like to an open hopper body, it is possible to prevent the ready-mix concrete from leaking out of the hopper body through the gap between the hopper body and the lid, and to stably supply ready-mix concrete to the hopper body.

[0011] Furthermore, in the concrete pump according to an embodiment of the present invention, in embodiment 1 above, the lid is The hopper body has a cover plate that can close the opening, and in the closed state, the edge of the cover plate facing the pivot axis protrudes outward from the hopper body, and the edge of the cover plate is provided with a through hole that penetrates the cover plate. With this configuration, the concrete pump according to the present invention can effectively prevent rainwater from entering the inside of the hopper body, for example, in a hopper means where the hopper body is in a closed state, even if rainwater or the like falls on the upper surface of the lid (more specifically, the lid plate), the rainwater or the like can be immediately drained through the through holes provided at the edge of the lid plate.

[0012] Furthermore, in the concrete pump according to embodiment 3 of the present invention, in embodiment 1 or embodiment 2, the hopper means comprises an upright holding means for holding the lid in an upright state when it is open, the upright holding means comprises a hook member provided protruding from either the hopper body or the lid, a holding plate provided on the other of the hopper body or the lid, and a locking member that can be locked to the hook member, the holding plate has an insertion portion through which the hook member can be inserted, and in the upright state, the hook member is inserted into the holding plate via the insertion portion, and the upright state is maintained by locking the locking member to the hook member on the side of the hook member that protrudes from the holding plate. Thus, in the concrete pump according to the present invention, the retaining plate, which has been inserted into the hook member, is prevented from coming out of the hook member again when the lid is in an upright position by the locking member. For example, even if the hopper means is subjected to an unexpected impact from the outside, the upright position of the lid can be stably maintained by the upright holding means having these hook member, retaining plate, and locking member.

[0013] Furthermore, the concrete pump according to aspect 4 of the present invention comprises a hopper means capable of storing fresh concrete, a pump means connected to the bottom of the hopper means for sucking the fresh concrete in the hopper means and discharging it to the outside, a support member that supports a concrete discharge pipe communicating with the discharge port of the pump means from above the hopper means, and a cover member made of a long sheet-like member that covers the concrete discharge pipe and the support member from above, and further comprises a stay member located above the support member and supporting the cover member from below. With this configuration, according to the concrete pump of the present invention, even if the fastening member protrudes upward in a support member that supports the concrete discharge pipe from above by being detachably fixed to the concrete discharge pipe using fastening members such as bolts, the cover member can be supported from below by a stay member, thereby preventing the cover member from coming into contact with the fastening member and causing damage. [Effects of the Invention]

[0014] The present invention provides the following effects: In other words, with the concrete pump according to the present invention, it is possible to prevent a gap from forming between the hopper body and the lid when viewed in a direction perpendicular to the rotation axis in a plan view, regardless of whether the hopper body is in an open or closed state. [Brief explanation of the drawing]

[0015] [Figure 1] This is a side view showing the overall configuration of a concrete pump truck equipped with a concrete pump according to one embodiment of the present invention. [Figure 2] This is a side view showing the configuration of the hopper device. [Figure 3] This diagram shows the configuration of the hopper device, and is a plan view taken in the direction of arrow X1 in Figure 2. [Figure 4]It is a diagram showing the configuration of the rotating part in the hopper device, and it is an enlarged plan view of the portion indicated by the region A in FIG. 3. [Figure 5] It is a diagram for explaining the operation of the hopper device, where (a) is a partially enlarged side view showing the state where the lid is open, and (b) is a partially enlarged side view showing the state where the lid is closed. [Figure 6] It is a diagram showing the configuration of the upright holding mechanism part in the hopper device, and it is an enlarged front view seen in the direction of arrow X2 in FIG. 5(a). [Figure 7] It is a partial cross-sectional plan view showing the configuration of the pump device. [Figure 8] It is a side view showing the configuration of the hopper device provided with a cover member. [Figure 9] In another embodiment of the present invention, it is a side view showing the overall configuration of a work vehicle equipped with a concrete pump. [Figure 10] In another embodiment of the present invention, it is a cross-sectional side view showing the configuration of the pump device provided in the concrete pump. [Figure 11] It is a diagram for explaining a conventional hopper device, where (a) is an enlarged side view showing the configuration of the pivot point between the hopper body and the lid, and (b) is a cross-sectional rear view of the hopper device seen in the direction of arrow X3 in FIG. 11(a).

Embodiments for Carrying out the Invention

[0016] Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 10. In the following description, for convenience, the front-rear direction, left-right direction, and up-down direction of the concrete pump truck 1 or the work vehicle 101 are defined and described according to the directions of the arrows shown in FIGS. 1 to 9.

[0017] [Overall Configuration of Concrete Pump Truck 1] First, the overall configuration of the concrete pump truck 1 equipped with the concrete pump 50 embodying the present invention will be described with reference to FIG. 1.

[0018] The concrete pump truck 1 in this embodiment is an example of a work vehicle that pumps ready-mix concrete, which has been transported to the site by a mixer truck or the like, to the desired concrete placement site, and mainly comprises a chassis frame 10, a subframe 20, a cabin 30, a boom device 40, and a concrete pump 50.

[0019] The chassis frame 10 consists of a pair of elongated chassis frame members 11-11 extending in the front-rear direction (Figure 1 is a side view, so only one chassis frame member 11 is shown), and these pair of chassis frame members 11-11 are arranged parallel to each other at a predetermined distance in the left-right direction, which is the vehicle width direction.

[0020] On the other hand, the subframe 20, like the chassis frame 10, consists of a pair of elongated subframe members 21-21 extending in the front-rear direction (only one subframe member 21 is shown in Figure 1 as it is a side view), and these pair of subframe members 21-21 are arranged parallel to each other with a predetermined distance between them in the left-right direction.

[0021] The subframe 20 is fixed to the chassis frame 10 with these pair of subframe members 21, 21 positioned along the upper surfaces of the left and right pair of chassis frame members 11, 11. In other words, the chassis frame 10 and subframe 20 constitute the body of the concrete pump truck 1.

[0022] The cabin 30 constitutes the driver's compartment and is provided at the front end of the chassis frame 10 so as to be able to be tilted forward relative to the chassis frame 10.

[0023] The boom device 40 is supported by a subframe 20 and includes a turntable 41 fixed to the front end of the subframe 20, a support column 42 supported on the turntable 41 so as to be able to rotate around a vertical axis, a boom 43 supported at the upper end of the support column 42, and a boom attachment 44 provided at the tip of the boom 43.

[0024] The boom 43 is a so-called four-stage boom, having a first boom 43a, a second boom 43b, a third boom 43c, and a fourth boom 43d that are bendably connected to each other.

[0025] The base end 43a1 of the first boom 43a is rotatably connected to the upper end of the support column 42. Furthermore, the base end portion 43b1 of the second boom 43b is rotatably connected to the tip portion 43a2 of the first boom 43a. Furthermore, the base end 43c1 of the third boom 43c is rotatably connected to the tip end 43b2 of the second boom 43b. Furthermore, the base end 43d1 of the fourth boom 43d is rotatably connected to the tip end 43c2 of the third boom 43c.

[0026] A boom attachment 5 is connected to the tip 43d2 of the fourth boom 43d.

[0027] The turntable 41 has a rotation drive means 41a that rotates the support column 42.

[0028] A first hydraulic cylinder 45 is interposed between the support column 42 and the first boom 43a, and by extending and retracting the first hydraulic cylinder 45, the first boom 43a can be raised and lowered relative to the support column 42. Furthermore, a second hydraulic cylinder 46 is interposed between the first boom 43a and the second boom 43b, and by extending and retracting the second hydraulic cylinder 46, the second boom 43b can be rotated relative to the first boom 43a. Furthermore, a third hydraulic cylinder 47 is interposed between the second boom 43b and the third boom 43c, and by extending and retracting the third hydraulic cylinder 47, the third boom 43c can be rotated relative to the second boom 43b. Furthermore, a fourth hydraulic cylinder 48 is interposed between the third boom 43c and the fourth boom 43d, and by extending and retracting the fourth hydraulic cylinder 48, the fourth boom 43d can be rotated relative to the third boom 43c.

[0029] Furthermore, concrete pipes 49 are fixed to the support column 42 and the first boom 43a, second boom 43b, third boom 43c, and fourth boom 43d of the boom 43, for guiding fresh concrete pumped from the concrete pump 50 to the tip 43d2 of the fourth boom 43d of the boom 43.

[0030] The concrete pump 50 is an example of a concrete pump according to the present invention, and is a device for pumping fluids such as ready-mixed concrete. The concrete pump 50 mainly comprises a hopper device 51 capable of temporarily storing ready-mix concrete supplied from a mixer truck or the like, and a pump device 52 connected to the bottom of the hopper device 51 that sucks the ready-mix concrete from the hopper device 51 and discharges it to the outside of the hopper device 51. Here, the hopper device 51 is an example of a hopper means according to the present invention. Furthermore, the pump device 52 is an example of a pumping means according to the present invention.

[0031] Further details regarding the configuration of the concrete pump 50 will be described later.

[0032] In a concrete pump truck 1 having such a configuration, by operating the slewing drive means 41a on the turntable 41, as well as the first hydraulic cylinder 45, second hydraulic cylinder 46, third hydraulic cylinder 47, and fourth hydraulic cylinder 48, the support column 42 can be rotated, and the first boom 43a, second boom 43b, third boom 43c, and fourth boom 43d of the boom 43 can be bent alternately to a folded state (as shown in Figure 1), or these first boom 43a, second boom 43b, third boom 43c, and fourth boom 43d can be arbitrarily raised or extended.

[0033] Furthermore, with the boom 43 erected and extended, ready-mix concrete can be pumped by the concrete pump 50, guiding it through the concrete piping 49 to the movable elbow pipe 2 provided at the tip of the boom attachment 44, and supplying the ready-mix concrete to the desired placement position through a hose (not shown) connected to the movable elbow pipe 2.

[0034] [Configuration of Concrete Pump 50] Next, the configuration of the concrete pump 50 will be described in detail using Figures 1 to 8. In Figure 1, the concrete pump 50 includes, as described above, a hopper device 51 capable of storing ready-mixed concrete, and a pump device 52 connected to the hopper device 51 that sucks the ready-mixed concrete from the hopper device 51 and discharges it to the outside.

[0035] As shown in Figure 2, the hopper device 51 includes a hopper body 511 with an open top, a lid 512 that can open and close the opening V (see Figure 3) of the hopper body 511, and a connecting mechanism 513 that connects the lid 512 to the upper end of the hopper body 511 so that it can rotate up and down. Furthermore, the hopper device 51 has an upright holding device 514 that rotates the lid 512 upward and holds it in an upright position (hereinafter referred to as "upright position" as appropriate). The upright holding device 514 is an example of an upright holding means according to the present invention.

[0036] The hopper body 511 is positioned at the rear of the concrete pump truck 1 (see Figure 1) with its upper edge 511a inclined toward the rear and downward. Furthermore, the hopper body 511 is connected at its bottom to the valve casing 522a (see Figure 7) of the pump device 52, and is fixed to the subframe 20 (see Figure 1) via the pump device 52.

[0037] Furthermore, hopper floors 511b, which have a roughly U-shaped surface in plan view, are installed horizontally on both the left and right sides and the rear side of the hopper body 511, providing a work surface for cleaning and maintenance work on the hopper body 511. Furthermore, the upper surface of the hopper floor 511b is located below the lowest end of the upper edge 511a of the hopper body 511 (in this embodiment, the rear end of the upper edge 511a).

[0038] Furthermore, a stirring blade 511c is rotatably supported inside the hopper body 511, maintaining the fluidity of the fresh concrete temporarily stored in the hopper body 511 and guiding the fresh concrete to the pump device 52 (more specifically, the valve casing 522a).

[0039] Furthermore, the hopper floor 511b is not an essential component of the hopper body 511 and does not need to be provided in the hopper body 511.

[0040] As shown in Figure 3, the lid 512 has a lid plate 512a that can close the opening V of the hopper body 511, and a reinforcing member 512b that reinforces the lid plate 512a.

[0041] The lid plate 512a is a plate-shaped member with an external size that is slightly larger than the opening area of ​​the opening V in the hopper body 511. Furthermore, the lid plate 512a is connected at one end (in this embodiment, the front end of the lid plate 512a when the opening V of the hopper body 511 is closed (closed state)) to the upper end of the front surface of the hopper body 511 (more specifically, the front edge 511a1; see Figure 5) via the connecting mechanism 513 so as to be able to rotate up and down. In this embodiment, the pivot axis Z of the connecting mechanism 513 (see Figure 4) is located above and approximately parallel to the leading edge 511a1.

[0042] Furthermore, when the hopper body 511 is closed, the lid plate 512a is positioned such that the edge 512a1 on the side opposite to the pivot axis Z of the connecting mechanism 513 (described later), i.e., the rear end side, protrudes outward from the outer edge side of the hopper body 511, i.e., to the rear. Furthermore, the rear edge portion 512a1 of the cover plate 512a has a plurality of through holes 512a2, 512a2, ... provided at predetermined intervals along the extending direction (left-right direction) of the edge portion 512a1 that penetrate the cover plate 512a. In other words, the edge portion 512a1 of the lid plate 512a is located above the hopper floor 511b, and the multiple through holes 512a2, 512a2, ... are located on the outside (rear side) relative to the upper edge 511a (more specifically, the rear edge 511a2) of the hopper body 511, and above the hopper floor 511b.

[0043] The number of through holes 512a2 is not limited to this embodiment; for example, only one through hole 512a2 may be provided at a predetermined location on the edge portion 512a1 of the cover plate 512a.

[0044] Thus, in this embodiment, the lid 512 has a lid plate 512a that can close the opening V of the hopper body 511. In the closed state, the edge 512a1 of the lid plate 512a on the side facing the pivot axis Z (rear end side) protrudes outward (rear side) of the hopper body 511, and a through hole 512a2 is provided in the edge 512a1 of the lid plate 512a that penetrates the lid plate 512a.

[0045] With this configuration, the concrete pump 50 of this embodiment can effectively prevent rainwater from entering the inside of the hopper body 511, even if rainwater falls on the upper surface of the lid 512 (more specifically, the lid plate 512a) in a hopper device 51 where the hopper body 511 is in a closed state, by immediately draining the rainwater through the multiple through holes 512a2, 512a2, etc. provided in the edge portion 512a1 of the lid plate 512a.

[0046] Furthermore, as described above, since the hopper body 511 is positioned with its upper edge 511a (see Figure 2) inclined toward the rear and downward, the orientation of the lid plate 512a in the closed state is also inclined toward the rear and downward. In other words, in the closed state, the lid plate 512a is inclined downward toward the edge portion 512a1.

[0047] Therefore, rainwater that drips onto the upper surface of the cover plate 512a is effectively guided to the edge portion 512a1 by its own weight and can be efficiently drained through the through hole 512a2. Furthermore, rainwater that falls through the through-hole 512a2 drips onto the hopper floor 511b, but since the hopper floor 511b is located outside the hopper body 511, and the upper edge 511a of the hopper body 511 protrudes upward relative to the hopper floor 511b even at its lowest point (the rear edge 511a2 in this embodiment), rainwater does not penetrate into the interior of the hopper body 511.

[0048] The reinforcing member 512b includes a substantially "C"-shaped first reinforcing member 512b1 provided along the rear end, both left and right ends, and both left and right sides of the front end of the cover plate 512a; a second reinforcing member 512b2 provided along the left-right central part of the one side end (front end) of the cover plate 512a; and a plurality of third reinforcing members 512b3, 512b3, ... which are suspended on the first reinforcing member 512b1 and the second reinforcing member 512b2 along the upper surface of the cover plate 512a.

[0049] At the front end of the cover plate 512a, the second reinforcing member 512b2 is arranged coaxially with the first reinforcing member 512b1, and substantially identical gaps Q·Q are formed between the left and right ends of the second reinforcing member 512b2 and the first reinforcing member 512b1.

[0050] On the other hand, at the rear end of the cover plate 512a, the first reinforcing member 512b1 is provided in a position that avoids the aforementioned plurality of through holes 512a2, 512a2, ... In other words, these plurality of through holes 512a2, 512a2, ... are each located inside the first reinforcing member 512b1. As a result, rainwater and the like that that is guided along the inclined cover plate 512a to the edge 512a1 is temporarily blocked by the first reinforcing member 512b1, and then can be drained more efficiently through the through hole 512a2.

[0051] These first reinforcing members 512b1, second reinforcing member 512b2, and third reinforcing member 512b3 are each made of round pipes and are fixed to the cover plate 512a by welding or the like.

[0052] Furthermore, the members forming the first reinforcing member 512b1, the second reinforcing member 512b2, and the third reinforcing member 512b3 are not limited to round pipes, but may be, for example, round bar members or rod-shaped members with polygonal cross-sections. However, in the case of the first reinforcing member 512b1 and the second reinforcing member 512b2 located at the front end of the cover plate 512a, it is desirable that, as will be described later, at least the region Y (the region indicated by "shading" in Figure 3) which is coaxial with the rotation axis Z of the connecting mechanism 513 be formed from round pipes or round bar members having substantially the same outer diameter size.

[0053] The connecting mechanism 513 is provided in the pair of left and right gaps Q·Q described above, and connects the lid 512 to the upper end of the hopper body 511 so that it can rotate up and down. Furthermore, the connecting mechanism 513 provided in the left gap Q (hereinafter referred to as "left connecting mechanism 513L" as appropriate) and the connecting mechanism 513 provided in the right gap Q (hereinafter referred to as "right connecting mechanism 513R" as appropriate) have substantially the same configuration. Therefore, in the following explanation, the configuration of the left connecting mechanism 513L will be described mainly, and the configuration of the right connecting mechanism 513R will be omitted.

[0054] The connecting mechanism 513 (i.e., the left-side connecting mechanism 513L), as shown in Figure 4, includes, for example, a general-purpose flat hinge 513a, a first plate material 513b attached to one wing portion 513a1 of the flat hinge 513a, and a second plate material 513c attached to the other wing portion 513a2. On the other hand, a long first stay member 511d, which for example has a "U" shape in cross-section, is provided along the upper end of the front surface of the hopper body 511.

[0055] The connecting mechanism 513 is positioned such that the pivot axis Z of the flat hinge 513a is coaxial with the first reinforcing member 512b1 and the second reinforcing member 512b2 which constitute one side end (the front end in this embodiment) of the lid 512. The connecting mechanism 513 is connected to the aforementioned one side end (front end) of the lid plate 512a via the first plate 513b, and is also connected to the upper surface of the first stay member 511d via the second plate 513c. As a result, the lid 512 is connected by the connecting mechanism 513 to the upper end of the hopper body 511 so as to be vertically rotatable, around the pivot axis Z of the flat hinge 513a that extends along one end (front end) of itself. By rotating upward and standing upright, the lid opens the opening V (see Figure 3) of the hopper body 511 (see Figure 5(a)), and by rotating downward and tipping over, the opening V of the hopper body 511 closes (see Figure 5(b)).

[0056] As described above, in this embodiment, the first reinforcing member 512b1 and the second reinforcing member 512b2 that constitute the front end of the lid 512 are both formed from round pipes, and the pivot axis Z of the lid 512 by the connecting mechanism 513 is provided coaxially with these first reinforcing member 512b1 and second reinforcing member 512b2.

[0057] As a result, as shown in Figures 5(a) and 5(b), the position of the first intersection P1 on the hopper body 511 side (see Figure 5(a)) where the imaginary line L, which is perpendicular to the upper edge 511a of the hopper body 511 and passes through the rotation axis Z, intersects with one side end of the lid 512 in the open state (the first reinforcing member 512b1 and the second reinforcing member 512b2 which constitute the front end), is approximately the same as the position of the second intersection P2 on the hopper body 511 side where the imaginary line L intersects with one side end of the lid 512 in the closed state (the first reinforcing member 512b1 and the second reinforcing member 512b2).

[0058] Therefore, as will be described later, with the concrete pump 50 of this embodiment, whether the hopper body 511 is in an open or closed state, the lid 512 can be pivotally supported on the hopper body 511 so that no gap is created between the hopper body 511 and the lid 512 when viewed from the front (i.e., in the direction perpendicular to the rotation axis Z in a plan view (front-to-back direction)).

[0059] In particular, the position of the first intersection point P1 on the hopper body 511 side, where the virtual normal line passing through the front edge 511a1 of the hopper body 511 and the pivot axis Z intersects with one side end of the lid 512 in the open state (the first reinforcing member 512b1 and the second reinforcing member 512b2 constituting the front end), is approximately the same as the position of the second intersection point P2 on the hopper body 511 side, where the virtual normal line intersects with one side end of the lid 512 in the closed state (the first reinforcing member 512b1 and the second reinforcing member 512b2). Therefore, regardless of whether the hopper body 511 is in the open or closed state, the lid 512 can be pivotally supported on the hopper body 511 so that, when viewed from the front, there is no gap between the upper edge 511a on the front side of the hopper body 511 and the lid 512.

[0060] In addition, in a front view, both the first intersection P1 and the second intersection P2 may be located on the front edge 511a1 of the hopper body 511.

[0061] The standing support device 514 is provided, for example, in this embodiment, with respect to the left-side connecting mechanism 513L (see Figure 3), but is not limited to this. That is, the upright holding device 514 may be provided, for example, with respect to the right-side connecting mechanism 513R, or it may be provided with respect to both the right-side connecting mechanism 513R and the left-side connecting mechanism 513L.

[0062] The upright holding device 514 includes a hook member 514a that protrudes from either the hopper body 511 or the lid 512 (in this embodiment, the hopper body 511), a holding plate 514b that is provided on the other of the hopper body 511 or the lid 512 (in this embodiment, the lid 512), and a locking member 514c that can be locked to the hook member 514a.

[0063] The hook member 514a is, for example, a plate-like member that is roughly "L" shaped, and is fixed to the front surface of the first stay member 511d with its thickness direction oriented left to right and its tip protruding upward.

[0064] The retaining plate 514b is made of a substantially rectangular plate-like member that is bent in the shape of an "L", for example, and has a first flat portion 514b1 and a second flat portion 514b2 that extends perpendicularly from one end of the first flat portion 514b1. Furthermore, as shown in Figure 4, the retaining plate 514b is erected on the first plate material 513b of the connecting mechanism 513 via a first planar portion 514b1, and the second planar portion 514b2 is positioned to extend in a direction perpendicular to the rotation axis Z in a plan view, and on the opposite side from the lid 512 side (the front side in Figure 4).

[0065] At the tip of the second planar portion 514b2, a notch 514b3 is provided in the center in the left-right direction, extending toward the first planar portion 514b1 side (the rear side in Figure 4). The notched portion 514b3 is an example of a through portion according to the present invention.

[0066] Furthermore, a pair of reinforcing plates 514b4 and 514b4 are provided at both ends of the retaining plate 514b in the left-right direction to reinforce the retaining plate 514b. The reinforcing plate 514b4 is not an essential component of the retaining plate 514b and may not be provided on the retaining plate 514b.

[0067] Then, by rotating the closed lid 512 upward around the pivot axis Z, the retaining plate 514b rotates along with the lid 512 around the pivot axis Z, gradually inserting the hook member 514a into the inside of the notch 514b3. Furthermore, as shown in Figure 5(a), the retaining plate 514b, at the same time that the lid 512 is in an upright position, brings the second flat portion 514b2 into contact with the front surface of the first stay member 511d, thereby restricting further rotational movement of the lid 512.

[0068] In this manner, the retaining plate 514b restricts the upright position of the lid 512 by bringing its second flat portion 514b2 into contact with the first stay member 511d, and the second flat portion 514b2 is provided with a notch 514b3 (see Figure 4) through which the hook member 514a can be inserted. Furthermore, the configuration of the insertion portion through which the hook member 514a can be inserted is not limited to the notched portion 514b3 as in this embodiment, but may be configured as a through hole having a circular or oval shape, for example.

[0069] The locking member 514c, as shown in Figure 6, for example, is an oval-shaped member and is attached to the tip of a general-purpose toggle clamp 514d. On the other hand, the toggle clamp 514d is supported on the front side of the hopper body 511 with the locking member 514c facing upward. Since the toggle clamp 514d consists of a generally known configuration, a detailed explanation will be omitted.

[0070] As shown in Figure 5(b), when the opening V of the hopper body 511 (see Figure 3) is closed by the lid 512 (closed state), the locking member 514c is held by the toggle clamp 514d at a distance from the hook member 514a. Then, as shown in Figure 5(a), when the lid 512 is raised and the opening V of the hopper body 511 is opened, the locking member 514c is locked to the tip of the hook member 514a, and its position is then maintained by the toggle clamp 514d.

[0071] As a result, the second flat portion 514b2 of the retaining plate 514b is held between the locking member 514c and the first stay member 511d of the hopper body 511, and the lid 512 is held upright by the upright holding device 514.

[0072] As described above, in this embodiment, the hopper device (hopper means) 51 is equipped with an upright holding device (upright holding means) 514 that holds the lid 512 in an upright position when it is open. The upright holding device 514 includes a hook member 514a that protrudes from either the hopper body 511 or the lid 512 (in this embodiment, the hopper body 511), a holding plate 514b that is provided on the other of the hopper body 511 or the lid 512 (in this embodiment, the lid 512), and a locking member 514c that can be locked to the hook member 514a. Furthermore, the retaining plate 514b has a notch (insertion portion) 514b3 through which the hook member 514a can be inserted.

[0073] In the upright position described above, the hook member 514a is inserted into the retaining plate 514b via the notch 514b3, and the locking member 514c is locked to the hook member 514a at the protruding side (tip end) of the hook member 514a relative to the retaining plate 514b, thereby maintaining the upright position of the lid 512.

[0074] Thus, in the concrete pump 50 of this embodiment, the locking member 514c prevents the second flat portion 514b2 of the retaining plate 514b, which has been inserted into the hook member 514a, from coming out of the hook member 514a again when the lid 512 is in an upright position. For example, even if the hopper device 51 is subjected to an unexpected impact from the outside, the upright holding device 514 having these hook member 514a, retaining plate 514b, and locking member 514c can stably maintain the upright position of the lid 512.

[0075] The configuration of the locking member 514c is not limited to this embodiment. For example, it may consist of a wedge-shaped plate member that extends to one side and whose thickness gradually decreases (or increases) in the direction of extension, and which is inserted from the thinner end between the second flat portion 514b2 of the retaining plate 514b and the tip of the hook member 514a, thereby being able to maintain the upright position of the lid 512.

[0076] The pump device 52 is a so-called piston-type pump device, and as shown in Figure 7, it has a pump body 521 mounted on a subframe 20 (see Figure 1) and a valve body 522 positioned behind the pump body 521.

[0077] The pump body 521 is a hydraulically driven double-acting piston pump, and includes a left pump cylinder 521a and a right pump cylinder 521b that extend in the front-rear direction and are arranged in parallel in the left-right direction.

[0078] The front end of the left pump cylinder 521a is connected to the left drive cylinder 521c, which drives the left pump cylinder 521a, via the center frame 521d. Furthermore, the front end of the right-side pump cylinder 521b is connected to the right-side drive cylinder 521e, which drives the right-side pump cylinder 521b, via the center frame 521d, just like the left-side drive cylinder 521c. Furthermore, the left-side drive cylinder 521c and the right-side drive cylinder 521e extend in the front-to-back direction and are arranged in parallel in the left-to-right direction.

[0079] The discharge end 1 is slidably fitted inside the left pump cylinder 521a. The pump piston 521b1 is slidably fitted inside the right pump cylinder 521b. On the other hand, a drive piston 521c1 is slidably fitted inside the left drive cylinder 521c. Also, a drive piston 521e1 is slidably fitted inside the right drive cylinder 521e.

[0080] The pump piston 521a1 in the left pump cylinder 521a and the drive piston 521c1 in the left drive cylinder 521c are integrally connected by a piston rod 521f that slidably passes through the center frame 521d. Furthermore, the pump piston 521b1 in the right-side pump cylinder 521b and the drive piston 521e1 in the right-side drive cylinder 521e are integrally connected by a piston rod 521g that slidably passes through the center frame 521d.

[0081] The drive piston 521c1 inside the left drive cylinder 521c divides the inside of the left drive cylinder 521c into a rear front oil chamber 521c2 on the piston rod side and a front base oil chamber 521c3 on the opposite side of the piston rod. Similarly, the drive piston 521e1 in the right-side drive cylinder 521e divides the inside of the right-side drive cylinder 521e into a rear end oil chamber 521e2 and a front base oil chamber 521e3.

[0082] The rear end of the left pump cylinder 521a, which is the tip, is opened as a discharge end 521a2, and the rear end of the right pump cylinder 521b, which is the tip, is opened as a discharge end 521b2.

[0083] The valve body 522 comprises a valve casing 522a, a bottom cover 522b, a pivot shaft c, an S-shaped valve driving means 522d, and a discharge pipe 522e. Note that the discharge pipe 522e is an example of a concrete discharge pipe according to the present invention.

[0084] The valve casing 522a is formed in a frame shape by a front wall 522a1, a rear wall 522a2, and left and right side walls 522a3, 522a3, and its lower part is open by an opening 522a4. The hopper body 511 of the hopper device 51 is connected to the upper part of the valve casing 522a, and is configured so that the ready-mixed concrete put into the hopper body 511 fills the inside of the valve casing 522a.

[0085] The discharge end 521a2 of the left pump cylinder 521a and the discharge end 521b2 of the right pump cylinder 521b are connected to the front wall 522a1 of the valve casing 522a and communicate with the inside of the valve casing 522a. The bottom cover 522b opens and closes the opening 522a4 at the bottom of the valve casing 522a using a cylinder or the like (not shown).

[0086] A curved tubular S-shaped valve 522c is housed and supported in the lower part of the valve casing 522a. The S-shaped valve 522c is integrally formed with a pivot shaft 522c1 that extends in a direction parallel to the axial direction of the left pump cylinder 521a and the right pump cylinder 521b, and is rotatable about the axis together with the pivot shaft 522c1.

[0087] The front end of the S-shaped valve 522c is open as an intake port 522c2, and by rotating the S-shaped valve 522c around the axis of the pivot shaft 522c1, the intake port 522c2 can be alternately switched to communicate with the discharge end 521a2 of the left pump cylinder 521a and the discharge end 521b2 of the right pump cylinder 521b. Furthermore, the rear end of the S-shaped valve 522c is open as a discharge port 521a3, and the discharge port 521a3 is connected to the rear wall 522a2 of the valve casing 522a.

[0088] The S-shaped valve driving means 522d is a driving means for driving the S-shaped valve 522c, and rotates the pivot shaft 522c1 in synchronization with the operation of the pump piston 521a1 of the left pump cylinder 521a and the pump piston 521b1 of the right pump cylinder 521b.

[0089] The S-shaped valve driving means 522d includes a left valve driving cylinder 522d1, a right valve driving cylinder 522d2, and a connecting arm 522d3. The left valve drive cylinder 522d1 and the right valve drive cylinder 522d2 work together to drive the S-shaped valve 522c.

[0090] The connecting arm 522d3 is connected to the front end of the pivot shaft 522c1, and the front end of the left valve drive cylinder 522d1 and the front end of the right valve drive cylinder 522d2 are connected to the connecting arm 522d3. The left valve drive cylinder 522d1 is located to the left of the connecting arm 522d3, and the right valve drive cylinder 522d2 is located to the right of the connecting arm 522d3. The base of the left valve drive cylinder 522d1 and the base of the right valve drive cylinder 522d2 are rotatably supported by the valve casing 522a.

[0091] During operation of the pump device 52, the left valve drive cylinder 522d1 and the right valve drive cylinder 522d2 switch and drive the S-shaped valve 522c so that the left pump cylinder 521a and the right pump cylinder 521b that are in the concrete suction state are connected to the valve casing 522a, and the one that is in the concrete pumping state is connected to the suction port 522c2 of the S-shaped valve 522c. This allows the ready-mixed concrete to be smoothly pumped from the pump body 521 through the S-shaped valve 522c.

[0092] In other words, the S-shaped valve 522c is driven by the S-shaped valve driving means 522d and is capable of reciprocating between a first switching position (shown by a dashed line in Figure 7) in which the intake port 522c2 is connected to the discharge end 521a2 of the left pump cylinder 521a, and a second switching position (shown by a solid line in Figure 7) in which the intake port 522c2 is connected to the discharge end 521b2 of the right pump cylinder 521b. The movement of the S-shaped valve 522c to the first switching position is performed by the extension operation of the left valve drive cylinder 522d1, and the movement of the S-shaped valve 522c to the second switching position is performed by the extension operation of the right valve drive cylinder 522d2.

[0093] The discharge pipe 522e has its front end connected to the rear wall 522a2 of the valve casing 522a and is in constant communication with the discharge port 522c3 of the S-shaped valve 522c. The rear end of the discharge pipe 522e is connected to the concrete pipe 49 of the boom device 40 (see Figure 1).

[0094] When pumping ready-mix concrete using the pump device 52 configured as described above, first, the ready-mix concrete is put into the hopper device 51 (more specifically, the hopper body 511) to fill the valve casing 522a, and the S-shaped valve 522c, the left pump cylinder 521a, and the right pump cylinder 521b are activated.

[0095] That is, for example, the right-side valve drive cylinder 522d2 is extended to rotate the S-shaped valve 522c to the right within the valve casing 522a, and the intake port 522c2 of the S-shaped valve 522c is connected to the discharge end 521b2 of the right-side pump cylinder 521b. This connects the right-side pump cylinder 521b and the discharge pipe 522e.

[0096] With the right pump cylinder 521b and the S-shaped valve 522c connected, the pump piston 521a1 of the left pump cylinder 521a is pulled forward, and the pump piston 521b1 of the right pump cylinder 521b is pushed backward, drawing the ready-mix concrete from the valve casing 522a into the left pump cylinder 521a.

[0097] Next, the left valve drive cylinder 522d1 is extended to rotate the S-shaped valve 522c to the left, and the intake port 522c2 of the S-shaped valve 522c is connected to the discharge end 521a2 of the left pump cylinder 521a. This connects the left-side pump cylinder 521a and the discharge pipe 522e.

[0098] With the left pump cylinder 521a and the S-shaped valve 522c connected, the left pump cylinder 521a and the right pump cylinder 521b are operated in the opposite direction to the above. That is, the pump piston 521b1 of the right pump cylinder 521b is pulled forward, while the pump piston 521a1 of the left pump cylinder 521a is pushed backward. As a result, the fresh concrete in the valve casing 522a is drawn into the right-side pump cylinder 521b. Furthermore, the fresh concrete that has been sucked into the left pump cylinder 521a is pushed out by the S-shaped valve 522c and pumped into the discharge pipe 522e.

[0099] By repeatedly performing the above operation, the fresh concrete in the valve casing 522a can be continuously pumped to the discharge pipe 522e.

[0100] As described above, the concrete pump 50 in this embodiment includes a hopper device (hopper means) 51 capable of storing fresh concrete, and a pump device (pump means) 52 connected to the hopper device 51 that sucks up the fresh concrete in the hopper device 51 and discharges it to the outside. The hopper device 51 has a hopper body 511 with an open top, and a lid 512 that can be moved between an open state with the opening V of the hopper body 511 open and a closed state with the opening V of the hopper body 511 closed.

[0101] Here, the lid 512 is connected to the upper end of the hopper body 511 so as to be vertically rotatable around a pivot axis Z that extends along one of its own side ends (front end). The position of the first intersection point P1 on the hopper body 511 side, where the imaginary line L, which is perpendicular to the upper end edge 511a of the hopper body 511 and passes through the pivot axis Z, intersects with the one side end (front end) of the lid 512 in the open state, is approximately the same as the position of the second intersection point P2 on the hopper body 511 side, where the imaginary line L intersects with the one side end (front end) of the lid 512 in the closed state.

[0102] Thus, in the concrete pump 50 of this embodiment, as shown in Figures 5(a) and 5(b), when the lid 512 is rotated upward to stand upright and the opening V of the hopper body 511 is opened, the position of the point on one side end (front end) of the lid 512 that is closest to the upper edge 511a (more specifically, the front edge 511a1) of the hopper body 511 (i.e., the first intersection P1) is substantially the same as when the lid 512 is rotated downward to close the opening V of the hopper body 511 and the position of the point on one side end (front end) of the lid 512 that is closest to the upper edge 511a (front edge 511a1) of the hopper body 511 (i.e., the second intersection P2) is substantially the same as when the lid 512 is rotated downward to close the opening V of the hopper body 511. In other words, whether the hopper body 511 is in the open or closed state, the position of the point on one side end (front end) of the lid 512 that is closest to the upper edge 511a of the hopper body 511 is maintained at approximately the same position.

[0103] Therefore, according to the concrete pump 50 of this embodiment, whether the hopper body 511 is in an open or closed state, the lid 512 can be pivotally supported on the hopper body 511 so that no gap is created between the hopper body 511 and the lid 512 when viewed from the front (i.e., in a direction perpendicular to the rotation axis Z in a plan view). As a result, even when, for example, ready-mix concrete is supplied to the open hopper body 511 from a mixer truck or the like, it is possible to prevent the ready-mix concrete from leaking out of the hopper body 511 through the gap between the hopper body 511 and the lid 512, and to stably supply ready-mix concrete to the hopper body 511. On the other hand, when the hopper body 511 is in a closed state, it is possible to prevent rainwater and other liquids from entering through the gap between the hopper body 511 and the lid 512 when the vehicle is stored or driven.

[0104] Incidentally, as shown in Figure 8, in the concrete pump 50, a cover member 53 may be provided at the rear of the hopper device 51 to protect the discharge pipe 522e that protrudes rearward from the pump device 52.

[0105] The cover member 53 is, for example, used to prevent ready-mix concrete from splashing from the hopper body 511 when it is supplied to the hopper body 511 by a mixer truck or the like, from adhering to the discharge pipe 522e, or to prevent ready-mix concrete from dripping from the supply port of the mixer truck or the like when it leaves the concrete pump truck 1 after it has finished supplying ready-mix concrete from adhering to the discharge pipe 522e.

[0106] The cover member 53 consists of a long waterproof sheet made of tarpaulin (for example, "One-Up®" manufactured by Teijin Limited), which is a high-strength vinyl-based sheet made by laminating synthetic resin to both the front and back surfaces of a polyester fabric.

[0107] The cover member 53 is stored in a rolled state under normal conditions (when not supplying ready-mixed concrete to the hopper body 511) by a winding device 54 provided on the underside of the hopper floor 511b at the rear side of the hopper body 511.

[0108] Then, when supplying ready-mixed concrete to the hopper body 511, the cover member 53 is pulled out from the winding device 54 and positioned to cover the discharge pipe 522e from above.

[0109] Since the winding device 54 has substantially the same configuration as the winding device installed in conventional concrete pumps, a detailed explanation will be omitted.

[0110] On the other hand, the discharge pipe 522e is connected at its tip (rear end) to the concrete pipe 49 of the boom device 40 (see Figure 1) using a general-purpose joint member 55 (for example, "Victolic Joint®" manufactured by Victaulic Japan Ltd.). Furthermore, the discharge pipe 522e is supported by a pipe support member 56 that extends rearward from the rear side of the hopper body 511, and is suspended upward via a joint member 55. The pipe support member 56 is an example of a support member according to the present invention.

[0111] In this embodiment, a second stay member 57 is provided on the rear side of the hopper body 511, positioned above the pipe support member 56, extending rearward substantially parallel to the pipe support member 56, and connecting with the pipe support member 56 at its tip. The cover member 53, which is pulled out and unfolded from the winding device 54, is supported from below by the second stay member 57. The second stay member 57 is an example of a stay member according to the present invention.

[0112] As described above, the concrete pump 50 in this embodiment includes a hopper device (hopper means) 51 capable of storing fresh concrete, a pump device (pump means) 52 connected to the bottom of the hopper device 51 (more specifically, the hopper body 511) and sucking the fresh concrete from the hopper body 511 and discharging it to the outside, a pipe support member (support member) 56 that supports the discharge pipe (concrete discharge pipe) 522e, which communicates with the discharge port of the pump device 52 (more specifically, the discharge port 522c3 of the S-shaped valve 522c; see Figure 7), from above the hopper device 51, and a cover member 53 made of a long sheet-like material that covers the discharge pipe 522e and the pipe support member 56 from above. Furthermore, the concrete pump 50 is located above the pipe support member 56 and further includes a second stay member (stay member) 57 that supports the cover member 53 from below.

[0113] With this configuration, according to the concrete pump 50 of this embodiment, even if the fastening member 58 protrudes upward in the pipe support member 56 that supports the discharge pipe 522e from above by being detachably fixed to the discharge pipe 522e via a joint member 55 using a fastening member 58 such as a bolt, the cover member 53 is supported from below by the second stay member 57, thereby preventing the cover member 53 from coming into contact with the fastening member 58 or the joint member 55 and causing damage. Furthermore, for example, when the supply of ready-mixed concrete to the hopper body 511 is completed and the cover member 53 is wound up again by the winding device 54, sliding the cover member 53 against the second stay member 57 prevents the cover member 53 from coming into contact with the fastening member 58 or the joint member 55 and causing damage.

[0114] [Alternative Embodiment] Next, another embodiment of the concrete pump according to the present invention will be described with reference to Figures 9 and 10.

[0115] The configuration of the work vehicle equipped with the concrete pump according to the present invention is not limited to the concrete pump truck 1 described above (see Figure 1), but may also be, for example, a piping truck or the like that does not have a boom device 40. Furthermore, as shown in Figure 9, the vehicle may also be a stationary work vehicle 101 comprising a chassis frame 102 and a subframe 103, a boom device 105 positioned on the vehicle body 104, which is transported to a designated site by being mounted on or towed by another transport vehicle, and then moved to the desired concrete pouring site by a crane, forklift, or by human power, and fixed in place by outriggers 106.

[0116] Furthermore, the concrete pump according to the present invention is not limited to these work vehicles, but may also be installed, for example, in a stationary concrete manufacturing device installed as production equipment in a factory that manufactures concrete products.

[0117] Furthermore, the configuration of the pumping means according to the present invention is not limited to the piston-type pumping device 52 described above. For example, as shown in Figure 10, it may be a so-called squeeze-type pumping device 150 comprising a cylindrical pump case 151 with both ends closed, a pumping tube 152 curved and housed inside the pump case 151 along its inner circumferential surface, a rubber roller 153 that rolls while pressing the pumping tube 152 from the inside of the curve and discharges fresh concrete sucked in from the lower end of the pumping tube 152 from the upper end, and a rotor 154 that holds the rubber roller 153 and rotates around the axis of the pump case 151 while rolling the rubber roller 153.

[0118] Although the reinforcing members 512b (first reinforcing member 512b1 and / or second reinforcing member 512b2) are exemplified as round pipes or round bars with a perfect circle cross-section, other cross-sectional shapes may also be used. At this time, when viewed in the direction of extension of the pivot axis Z (in this embodiment, the left-right direction), the position of the first intersection point P1 on the hopper body 511 side where the imaginary line L, which is perpendicular to the upper edge 511a (more specifically, the front edge 511a1) of the hopper body 511 and passes through the pivot axis Z, intersects with one side end of the lid 512 in the open state (the first reinforcing member 512b1 and the second reinforcing member 512b2 which constitute the front end) is approximately the same as the position of the second intersection point P2 on the hopper body 511 side where the imaginary line L intersects with one side end of the lid 512 in the closed state (the first reinforcing member 512b1 and the second reinforcing member 512b2).

[0119] Although one embodiment of the present invention has been described above, the present invention is not limited in any way to this embodiment, but is merely illustrative, and can be implemented in various other forms without departing from the spirit of the invention. The scope of the present invention is indicated by the claims, and further includes the meaning of equivalents as described in the claims, and all modifications within that scope. [Explanation of Symbols]

[0120] 50 Concrete pumps 51 Hopper device (hopper means) 511 Hopper body 511a Upper edge 512 Lid 512a Lid plate 512a1 Edge 512a2 Through hole 514 Standing holding device (standing holding means) 514a Hook member 514b Retainer plate 514b3 Notch (insertion part) 514c Locking member 52 Pumping device (pumping means) 522c S-shaped valve 522c3 outlet 522e Discharge piping (concrete discharge piping) 53 Cover component 56 Pipe support member (support member) 57. Second stay member (stay member) L virtual line P1 1st intersection P2 2nd intersection V opening Z-axis rotation

Claims

1. A hopper means capable of storing ready-mix concrete, The system includes a pump connected to the hopper means, which sucks up the ready-mixed concrete from the hopper means and discharges it to the outside. The hopper means comprises a hopper body with an open top, The hopper body has a lid that can be shifted between an open state, where the opening of the hopper body is open, and a closed state, where the opening of the hopper body is closed. The aforementioned cover is It is connected to the upper end of the hopper body so as to be vertically rotatable, with a pivot axis extending along one end of itself. Viewed in the direction of extension of the aforementioned pivot axis, The position of the first intersection point on the hopper body side, where a virtual line perpendicular to the upper edge of the hopper body and passing through the pivot axis intersects with one end of the lid in the open state, is: The position of the second intersection point on the hopper body side where the dashed line and one end of the lid in the closed state intersect is the same as the position of the second intersection point on the hopper body side. A concrete pump characterized by the following features.

2. The aforementioned cover is The hopper body has a cover plate that can close the opening, In the closed state, The edge of the cover plate facing the pivot axis protrudes toward the outer edge of the hopper body. The edge of the cover plate is provided with a through hole that penetrates the cover plate. A concrete pump according to claim 1, characterized in that...

3. The hopper means is, The lid is provided with an upright holding means for holding the lid in an upright position when it is in the open state, The aforementioned upright holding means is A hook member is provided protruding from either the hopper body or the lid, A retaining plate provided on either the hopper body or the lid, It has a locking member that can be locked to the aforementioned hook member, The retaining plate has an insertion portion through which the hook member can be inserted, In the aforementioned standing position, The hook member is inserted into the retaining plate via the insertion portion, On the side of the hook member that protrudes from the retaining plate, The upright position is maintained by locking the locking member to the hook member. A concrete pump according to claim 1 or claim 2, characterized in that...

4. A hopper means capable of storing ready-mix concrete, A pump means connected to the bottom of the hopper means is used to suck up the ready-mixed concrete inside the hopper means and discharge it to the outside. A support member supports the concrete discharge piping, which communicates with the discharge port of the pump means, from above the hopper means, It consists of a long, sheet-like member and comprises a cover member that covers the concrete discharge pipe and the support member from above, The system further includes a stay member located above the support member and supporting the cover member from below. A concrete pump characterized by the following features.

Images