Semi-trailer type mixer truck and semi-trailer having concrete mixer mechanism mounted thereon

Abstract

To provide a semi-trailer type mixer truck capable of transporting a great volume of ready mixed-concrete and taking driving operability into account.SOLUTION: This semi-trailer type concrete mixer truck comprises: a semi-trailer W having a concrete mixer mechanism provided with a drum 100 mounted thereon. A main frame 10 of the semi-trailer W includes a rear end side frame part 11 linearly extending from the rear end toward the front end, a middle frame part 12 of a roughly inverted truncated shape extending from the front end of the rear end side frame part 11 toward the front so as to be gradually wider outside, and a cobra-neck part 13 extending from the front end of the middle frame part 12 toward the front. The drum 100 is housed at a part of the front end in a gap of the middle frame part 12 opened in a roughly inverted truncated shape and a gap formed inside of a step 13a and a straight part 13b of the cobra-neck part 13 in a plan view and rotatably supported.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a semi-trailer type mixer truck and a semi-trailer equipped with a concrete mixer mechanism. [Background technology]

[0002] Patent Document 1 discloses the configuration of a mixer truck. The mixer truck described in Patent Document 1 comprises a vehicle body with a traveling function, a front support platform provided on the upper front side of the vehicle body, a rear support platform provided on the upper rear side of the loading platform, and a drum for storing a fluidizing material such as ready-mixed concrete. The vehicle body also has a cab (driver's compartment), a pair of left and right chassis frames extending in the front-to-rear direction, and a cross member connecting these chassis frames. The chassis frame includes a frame fixed to the cab (driver's compartment) and a subframe provided on the frame.

[0003] The front support base rotatably supports the front end of the drum, and the rear support base rotatably supports the rear end of the drum in an elevated position. In other words, the drum is rotatably supported in an inclined position by the front support base and the rear support base. An opening is formed at the rear end of the drum for charging and discharging ready-mixed concrete. A hopper is provided above and behind the opening for charging ready-mixed concrete into the drum. A pair of scoops are provided below the opening, one on each side, and a chute is provided below these scoops. Ready-mixed concrete discharged from the opening is guided by the scoops into the chute, which then guides it in a predetermined direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7034282 Summary of the Invention [Problem to be solved by the invention]

[0005] By the way, the mixer truck of the above-mentioned prior art is a large type (11 ton vehicle), and the capacity of ready-mixed concrete that can be loaded is "4.3 to 4.5 m 3 Therefore, at construction sites where large amounts of concrete are used, multiple concrete mixer trucks are lined up to transport the concrete to the site, which not only increases costs but also causes problems such as traffic congestion around the construction site. In recent years, there has been a social demand for reducing carbon dioxide emissions and a shortage of drivers. If there was a vehicle that could transport larger volumes of concrete than a concrete mixer truck, it would contribute to reducing carbon dioxide emissions and also address the driver shortage. Therefore, the inventors of the present application have developed a "9m" truck with a larger capacity than the conventional mixer truck. 3 He came up with the idea of ​​a semi-trailer equipped with a 9t tank. However, a large-capacity "9m" semi-trailer with a main frame that has a gooseneck section formed parallel to the width direction is used. 3 When the " tank is installed, the overall length (the length from front to back) of the vehicle becomes long due to its structure, which makes it difficult to drive and makes it impossible to enter narrow work sites, making it impractical.

[0006] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a semi-trailer mixer truck and a semi-trailer equipped with a concrete mixer mechanism that can transport larger amounts of ready-mixed concrete than conventional mixer trucks and that takes into consideration ease of operation. [Means for solving the problem]

[0007] The present invention, which has been made to solve the above problems, is a semi-trailer type mixer truck having a semi-trailer on which a concrete mixer mechanism equipped with a large-capacity drum for storing ready-mixed concrete is mounted, and a tractor to which the semi-trailer is connected, and the drum has a capacity of at least 9 m. 3 The semi-trailer has a pair of left and right main frames in a plan view that are arranged substantially parallel to one another with a predetermined gap between them, and the main frames have a rear-end frame section that extends linearly from its rear end to its front end along the longitudinal direction of the semi-trailer, a middle frame section that extends from the front end of the rear-end frame section forward in a plan view and has a substantially inverted V-shape in a plan view, and gradually widens outward in a plan view, and a cobra neck section that extends forward from the front end of the middle frame section, and the cobra neck section has a step section that extends upward at a substantially right angle from the front end of the middle frame section, a straight section that extends linearly from the top end of the step section toward the front of the semi-trailer along the longitudinal direction, and a and a tapered portion that is approximately V-shaped in plan view and extends so as to gradually narrow inward, and the concrete mixer mechanism comprises the drum, a front support base that supports the front end of the drum, a rear support base that supports the rear end of the drum, and a rotary drive mechanism that rotates the drum, and the drum is rotatably supported by the front support base and the rear support base in a state in which a portion of its front end is housed in a gap that opens in an approximately V-shape in the intermediate frame portion of the semi-trailer and in gaps formed on the inside of the stepped portion and the straight portion of the cobra neck portion in plan view, and the front end is inclined so that it is positioned lower than the rear end, and the front support base is installed on the straight portion of the cobra neck portion that is formed at a position one step higher than the intermediate frame portion.

[0008] Thus, according to the present invention, the volume of ready-mixed concrete (4.3 to 4.5 m) that can be transported by a conventional large-type mixer truck can be increased. 3 ") has about twice the capacity (9m 3(9 tons) of ready-mixed concrete. As a result, according to the present invention, for example, ready-mixed concrete can be transported to a construction site that uses a large amount of concrete using, for example, half the number of vehicles compared to when using conventional large-type concrete mixer trucks, thereby reducing costs and preventing traffic congestion around the construction site. Furthermore, the semi-trailer mixer truck of the present invention can transport larger amounts of concrete than conventional large-type concrete mixer trucks, which contributes to reducing carbon dioxide emissions and addresses the current driver shortage issue.

[0009] In addition, in the present invention, the main frame of the semi-trailer comprises a rear-end frame section extending linearly from its rear end to its front end in the longitudinal direction, a middle frame section extending forward from the front end of the rear-end frame section and having a generally inverted V-shape in plan view so as to gradually widen outward in plan, and a cobra neck section extending forward from the front end of the middle frame section. The cobra neck section has a stepped section extending upward at a substantially right angle from the front end of the middle frame section, a straight section extending linearly forward from the upper end of the stepped section in the longitudinal direction, and a tapered section having a generally V-shape in plan view so as to gradually narrow inward in plan from the front end of the straight section forward. The drum has a front end that is housed in a gap in the semi-trailer's intermediate frame that opens in an approximately inverted V shape, and in a gap formed on the inside of the stepped and straight sections of the cobra neck in plan view, allowing the drum to rotate freely without colliding with the stepped sections or the top surface of the main frame.

[0010] On the other hand, when attempting to load a large-capacity drum onto a semi-trailer equipped with a straight main frame with a typical gooseneck, the front end of the drum must be positioned a certain distance behind the step in the gooseneck and above the top surface of the main frame, otherwise the drum will collide with the step or the top surface of the main frame when rotated, hindering the drum's rotation. In other words, when attempting to load a large-capacity drum onto a semi-trailer equipped with a straight main frame having a typical gooseneck portion, the front end of the drum must be positioned a predetermined distance behind the step portion of the gooseneck portion, which requires a semi-trailer that is longer in the fore-and-aft direction of the vehicle than the invention of the present application. In this way, in the present invention, the drum can be positioned forward in the fore-and-aft direction of the vehicle, compared to when attempting to load a large-capacity drum onto a semi-trailer equipped with a straight main frame with a typical gooseneck portion, so the drum can be loaded onto a semi-trailer with a shorter length dimension in the fore-and-aft direction of the vehicle. As a result, according to the present invention, a large capacity (e.g., 9m) semi-trailer can be mounted on a typical straight frame semi-trailer. 3 Compared to when a tank is mounted, the length of the vehicle in the fore-and-aft direction can be made shorter, which takes into consideration drivability and allows it to enter narrow areas.

[0011] Furthermore, in this invention, the front end of the drum is positioned below the upper surface of the intermediate frame section of the main frame, and the front support base is installed on the straight section of the cobra neck section, which is formed one step higher than the intermediate frame section. This configuration eliminates the need to provide a component on the front support base to ensure a height dimension in order to rotatably support the drum, thereby reducing costs.

[0012] The present invention also provides a semi-trailer equipped with a concrete mixer mechanism having a large-capacity drum for storing ready-mixed concrete, the semi-trailer comprising a pair of left and right main frames arranged generally parallel to one another with a predetermined gap in plan view, the main frames comprising a rear-end frame section extending linearly from its rear end to its front end along the longitudinal direction of the semi-trailer, a middle frame section extending from the front end of the rear-end frame section forward in plan view so as to gradually widen outward in a generally inverted V-shape, and a cobra neck section extending forward from the front end of the middle frame section, the cobra neck section comprising a stepped section extending upward at a substantially right angle from the front end of the middle frame section, a linear section extending linearly from the upper end of the stepped section towards the front of the semi-trailer along the longitudinal direction, and a straight section extending linearly from the straight section. and a tapered section that is approximately V-shaped in plan view and extends from the front end of the line section toward the front so as to gradually narrow inward in plan view, and the concrete mixer mechanism comprises the drum, a front support base that supports the front end of the drum, a rear support base that supports the rear end of the drum, and a rotary drive mechanism that rotates the drum, and the drum has a front end that is partially housed in a gap that is approximately V-shaped in the intermediate frame section of the semi-trailer and in gaps formed in the stepped section and the straight section of the cobra neck section in plan view, and is rotatably supported by the front support base and the rear support base in a state where the front end is inclined so that it is positioned lower than the rear end, and the front support base is installed on the straight section of the cobra neck section that is formed at a position one step higher than the intermediate frame section. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a semi-trailer type mixer truck and a semi-trailer equipped with a concrete mixer mechanism that can transport larger amounts of ready-mixed concrete than conventional mixer trucks and that takes into consideration driving operability. [Brief explanation of the drawings]

[0014] [Figure 1]1 is a schematic diagram showing the configuration of a semi-trailer mixer truck according to an embodiment of the present invention. [Figure 2] 1 is a schematic side view of a semi-trailer equipped with a concrete mixer mechanism constituting a semi-trailer mixer truck according to an embodiment of the present invention. FIG. [Figure 3] 1 is a schematic diagram of a semi-trailer mounted with a concrete mixer mechanism constituting a semi-trailer type mixer truck according to an embodiment of the present invention, viewed from above. FIG. [Figure 4] FIG. 1 is a schematic diagram showing a main frame having a cobra neck portion of a semi-trailer according to an embodiment of the present invention and a main frame having a general gooseneck portion of a semi-trailer, in a top-bottom comparison. [Figure 5] 1A and 1B are schematic diagrams showing a cobra neck portion of a semi-trailer according to an embodiment of the present invention and a typical gooseneck portion of a semi-trailer, arranged one above the other; FIG. 1A is a schematic diagram of the cobra neck portion viewed from diagonally above, and FIG. 1B is a schematic diagram of the gooseneck portion viewed from diagonally above. [Figure 6] 1 is a schematic diagram showing a comparison of the length dimensions of a main frame having a cobra neck portion of a semi-trailer according to an embodiment of the present invention with the length dimensions of a main frame having a typical gooseneck portion of a semi-trailer, where (a) shows a side view of a semi-trailer equipped with a concrete mixer mechanism according to this embodiment, and (b) shows a side view of a semi-trailer equipped with a concrete mixer mechanism on a main frame having a typical linear gooseneck. [Figure 7] 1 is a schematic diagram of a semi-trailer mounted with a concrete mixer mechanism constituting a semi-trailer mixer truck according to an embodiment of the present invention, viewed from the rear. FIG. [Figure 8]1A and 1B are schematic diagrams showing the installation position of the drum on a main frame having a cobra neck portion according to an embodiment of the present invention, in comparison with the installation position of the drum on a main frame having a general gooseness portion, where (a) is a schematic diagram showing the installation position of the drum on a main frame having a cobra neck portion according to this embodiment, and (b) is a schematic diagram showing the installation position of the drum on a main frame having a general gooseness portion. [Figure 9] 8A and 8B are schematic diagrams showing the installation positional relationship between the cobra neck portion and the drum of a semi-trailer according to an embodiment of the present invention, and the installation positional relationship between the gooseneck portion and the drum of a general semi-trailer, where (a) is a schematic diagram showing the A-1 and A-2 cross sections of FIG. 8A, and (b) is a schematic diagram showing the B-1 and B-2 cross sections of FIG. 8B. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, the configuration of a semi-trailer mixer truck according to an embodiment of the present invention will be described with reference to the drawings.

[0016] First, the schematic configuration of the semi-trailer mixer truck of this embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram showing the configuration of the semi-trailer mixer truck of this embodiment.

[0017] As shown in the figure, the semi-trailer mixer truck of this embodiment has a large capacity (for example, 9 m) to accommodate ready-mixed concrete. 3 The vehicle includes a semi-trailer W on which a concrete mixer mechanism equipped with a drum 100 of (9 t) is mounted, and a tractor 200 to which the semi-trailer W is coupled. The semi-trailer W is connected to a coupler (not shown) provided on the rear body 210 of the tractor 200. Below, we will explain the semi-trailer W and the concrete mixer mechanism mounted on the semi-trailer in order.

[0018] First, the configuration of the semi-trailer W will be described with reference to the above-mentioned FIG. 1, and FIGS. Fig. 2 is a schematic side view of a semi-trailer equipped with a concrete mixer mechanism constituting the semi-trailer mixer truck of this embodiment. Fig. 3 is a schematic top view of a semi-trailer equipped with a concrete mixer mechanism constituting the semi-trailer mixer truck of this embodiment.

[0019] As shown in Fig. 3, the semi-trailer W has a pair of main frames 10 arranged substantially parallel to one another at a predetermined distance in a plan view. The main frames 10 are fixed by lateral frames 20 provided at multiple predetermined locations.

[0020] The main frames 10·10 also include rear-end frame sections 11·11 that extend linearly from their rear ends toward their front ends along the longitudinal direction (X direction) of the semi-trailer W, intermediate frame sections 12·12 that extend forward from the front ends of the rear-end frame sections 11·11 and have a generally inverted V-shape in plan view so as to gradually widen outward (on both the left and right sides) in plan view, and cobra neck sections 13·13 that extend forward from the front ends of the intermediate frame sections 12·12.

[0021] The cobra neck portion 13 has stepped portions 13a (see FIG. 2) extending upward at approximately a right angle from the front ends of the intermediate frame portions 12, straight portions 13b (see FIG. 2) extending linearly from the upper ends of the stepped portions 13a (see FIG. 2) forward along the longitudinal direction (X direction), and tapered portions 13c (see FIG. 2) extending from the front ends of the straight portions 13b (see FIG. 2) forward so as to gradually narrow inward in a plan view. The tapered portions 13c·13c are formed so as to gradually widen outward in a planar view from their front ends toward the straight portions 13b·13b, and the step portion 13a is positioned outward in a planar view from the rear end side frame portion 11 of the main frames 10·10 (and the front ends of the tapered portions 13c).

[0022] 1 and 2, a mounting base 43 for coupling to the tractor 200 is provided in front of the tapered portions 13c, 13c that make up the cobra neck portion 13, and a coupling pin 44 protrudes downward from the mounting base 43. Wheels 7, 8 are provided near the rear end of the rear frame portion 13a of the main frame 2, and a tail lamp 9 is provided at the rear end of the rear frame portion 13a.

[0023] As shown in Figure 1, the semi-trailer W is connected (coupled) to the tractor 200 by inserting a coupling pin 44 into a coupler (not shown) provided on the rear 210 of the tractor 200, and the tractor 200 and the semi-trailer W equipped with a concrete mixer mechanism form a semi-trailer type mixer truck. The reference numeral 201 denotes a cabin of the tractor 200, and the reference numeral 203 denotes wheels of the tractor 200.

[0024] Next, with reference to FIGS. 4 to 6, the configuration of the cobra neck portion 13 of the semi-trailer of this embodiment will be described in comparison with the configuration of a general gooseneck portion of a semi-trailer. Fig. 4 is a schematic diagram showing a main frame with a cobra neck portion of the semi-trailer of this embodiment compared to a main frame with a general gooseneck portion of a semi-trailer, Fig. 5 is a schematic diagram showing a cobra neck portion of the semi-trailer of this embodiment and a general gooseneck portion of a semi-trailer arranged vertically, where (a) is a schematic diagram of the cobra neck portion viewed from diagonally above, and (b) is a schematic diagram of the gooseneck portion viewed from diagonally above. Figure 6 is a schematic diagram showing the length dimensions of the main frame with a cobra neck portion of the semi-trailer of this embodiment compared to the length dimensions of the main frame with a typical gooseneck portion of a semi-trailer, where (a) shows a side view of the semi-trailer equipped with the concrete mixer mechanism of this embodiment, and (b) shows a side view of the semi-trailer equipped with a concrete mixer mechanism on a main frame with a typical linear gooseneck.

[0025] As shown in the lower diagram of FIG. 4, a semi-trailer Z having a main frame 310 with a general gooseneck portion 310 is formed in parallel straight lines across both the front and rear ends in a plan view.

[0026] Specifically, as shown in Figures 4, 5(b), and 6(b), a semi-trailer Z having a typical linear gooseneck portion 313 in a plan view is equipped with a pair of main frames 310 arranged parallel to each other at a predetermined distance from each other in a plan view. The main frames 310 are fixed by horizontal frames provided at multiple predetermined locations. The main frames 310 have first frame portions 311 extending linearly forward from the rear end of the vehicle along the longitudinal direction (X direction) of the semi-trailer Z, and gooseneck portions 313 extending forward from the front ends of the first frame portions 311. The gooseneck portions 313 are parallel to the first frame portions 311 (and have the same width dimension).

[0027] The gooseneck portions 313·313 have step portions 313a·313a extending upward at approximately a right angle from the front ends of the first frame portions 311·311, and straight portions 313b·313b extending in a straight line from the upper ends of the step portions 313a·313a toward the front along the longitudinal direction (X direction).

[0028] In contrast to the main frames 310 having the above-described gooseneck portions 313, the main frames 10 of this embodiment have linearly extending rear frame portions 11, generally inverted V-shaped middle frame portions 12, stepped portions 13a, linear portions 13b, and generally V-shaped tapered portions 13c, as shown in Figures 3, 4, 5(a), and 6(a). Because of this configuration, the front side of the main frames 10 having the cobra neck portion 13 of this embodiment has a shape resembling a cobra (snake) rearing its head. Therefore, the term "cobra neck portion 13" is used in this specification to distinguish it from a typical gooseneck portion 313.

[0029] Next, the concrete mixer mechanism mounted on the main frames 10 of the semi-trailer W will be described with reference to the above-mentioned FIGS. 1 to 6 and FIG. FIG. 7 is a schematic diagram of a semi-trailer mounted with a concrete mixer mechanism that constitutes the semi-trailer mixer truck of this embodiment, viewed from the rear.

[0030] Specifically, as shown in Figures 1 and 2, the concrete mixer mechanism mounted on the semi-trailer W has a large capacity (e.g., 9 m) to accommodate ready-mixed concrete. 3 (9t)), a front support stand 101 that supports the front end of the drum 100, a rear support stand 102 that supports the rear end of the drum 100, and a rotation drive mechanism 110 that rotates (forward and reverse) the drum 100 around a rotation axis S.

[0031] The front support base 101 is installed on the rear side of the cobra neck portion 13 at the front end side of the main frame 10 of the semi-trailer W, and the rear support base 102 is installed on the rear end side frame portion 11 at the rear end side of the main frame 10.

[0032] In addition, the drum 100 is rotatably supported by the front support base 101 and the rear support base 103 in a state in which a portion of its front end is stored in a gap that opens in an approximately inverted V shape in a planar view of the intermediate frame portions 12 of the semi-trailer W and in a gap formed inside the stepped portions 13a and straight portions 13b of the cobra neck portion 13 in a planar view (a gap having the same width dimension as the front end of the intermediate frame portions 12).The front end is inclined so that it is positioned lower than the rear end. In addition, the rotation drive mechanism 110 is installed on the front side of the cobra neck portion 13 at the front end side of the main frame 10 of the semi-trailer W, and is configured to rotate (forward and reverse) the drum 100 around the rotation axis S.

[0033] 7, an opening (not shown) is formed at the rear end of the drum 100, and a hopper 130 for inserting ready-mixed concrete into the drum 100 is provided above and behind this opening. A scoop 135 is provided below the opening (not shown), and a chute 140 is provided below this scoop 135. Ready-mixed concrete discharged from the opening of the drum 100 is guided by the scoop 135 to the chute 140, and then discharged in a predetermined direction by the chute 140. A water tank 145 is provided near the front end of the drum 100.

[0034] Next, the difference in the longitudinal (X-direction) dimensions of the vehicle when a concrete mixer mechanism is mounted on a semi-trailer W having main frames 10, 10 with intermediate frame sections 12, 12 formed in an approximately V-shape and cobra neck sections 13, 13 in this embodiment, and when a concrete mixer mechanism is mounted on a semi-trailer Z having straight main frames 310, 310 with conventional goosenecks 313, 313, will be explained with reference to Figures 3 to 6 mentioned above, as well as Figures 8 and 9.

[0035] Figure 8 is a schematic diagram comparing the installation position of the drum on a main frame having a cobra neck portion of this embodiment with the installation position of the drum on a main frame having a general gooseness portion, where (a) is a schematic diagram showing the installation position of the drum on a main frame having a cobra neck portion of this embodiment, and (b) is a schematic diagram showing the installation position of the drum on a main frame having a general gooseness portion. Figure 9 is a schematic diagram showing the installation positional relationship between the cobra neck part and the drum of the semi-trailer of this embodiment and the installation positional relationship between the gooseneck part and the drum of a general semi-trailer, where (a) is a schematic diagram showing the A-1 and A-2 cross sections of Figure 8(a), and (b) is a schematic diagram showing the B-1 and B-2 cross sections of Figure 8(b).

[0036] In this embodiment, as described above, a semi-trailer W is used that has main frames 10, 10 equipped with intermediate frame portions 12, 12 formed in an approximately inverted V shape in a plan view and cobra neck portions 13, 13. In this embodiment, as shown in Figures 4, 6(a), 8(a), and 9(a), by storing a portion of the front end of the drum 100 in a gap that is roughly inverted V-shaped in plan view of the intermediate frame sections 12 of the semi-trailer W and in a gap (a gap having the same width as the front end of the intermediate frame sections 12) formed inside the stepped sections 13a and straight sections 13b of the cobra neck section 13 in plan view (see Figures 6(a), 8(a), and 9(a)), the drum 100 can be installed so that it can rotate without interfering with the stepped sections 13a and the upper surface of the main frame 10. In addition, the front end of the drum 100 is positioned below the upper surfaces of the intermediate frame sections 12 of the main frames 10.

[0037] On the other hand, as shown in Figures 4, 6(b), 8(b), and 9(b), main frames 310·310 having general gooseneck portions 310·310 are formed with the same width interval along the fore-and-aft direction of the vehicle, and do not have gap portions with an expanded diameter in the width direction on either side of the step portion 313a in the fore-and-aft direction, like the main frames 10·10 of the semi-trailer W of this embodiment. 6(b), 8(b), and 9(b), when a large-capacity drum 100 is rotatably mounted on the main frames 310, 310 having the configurations shown in Fig. 6(b), 8(b), and 9(b), the front end of the drum 100 needs to be positioned a predetermined distance rearward from the stepped portion 313a and above the upper surface of the main frame 310. If this is not done, the drum 100 will collide with the stepped portion 313a of the main frames 310 or the upper surface of the main frames 310 when rotated, hindering the rotation of the drum 100.

[0038] Therefore, in the examples shown in Figures 6(b), 8(b), and 9(b), in order to prevent the rotation of the drum 100 from being hindered, a front support base 301 having a part 301a that ensures the height dimension of the drum 100 is installed at the front end side of the first frame portions 311-311 at a position a predetermined distance rearward from the step portion 313a, and the front end side of the drum 100 is supported by the front support base 301. In other words, when attempting to load a large-capacity drum 100 onto a semi-trailer Z equipped with a straight main frame 310 having a typical gooseneck portion 313, the front end of the drum 100 must be positioned a predetermined distance behind the step portion 313a of the gooseneck portion 313, so a semi-trailer Z that is longer in the fore-and-aft direction of the vehicle is required compared to this embodiment. For example, if a concrete mixer mechanism is installed on a semi-trailer Z of a typical configuration, the length dimension in the longitudinal direction (X direction) of the vehicle will be larger by 455 mm compared to the semi-trailer W of this embodiment shown in Figure 6(a).

[0039] In addition, in this embodiment, the front end of the drum 100 is positioned below the upper surface of the intermediate frame portions 12 / 12 of the main frames 10 / 10 so that the drum 100 can rotate, and a front support base 101 is provided on a cobra neck portion 13 formed at a position one step higher than the front end portions of the intermediate frame portions 12 / 12. Therefore, in order to rotatably support the drum 100, it is no longer necessary to provide the front support base 101 with a component for ensuring a dimension in the height direction (height ensuring component), which reduces costs.

[0040] Thus, according to this embodiment, a large capacity (9 m) can be used to transport a large amount of ready-mixed concrete. 3 It is possible to provide a semi-trailer type mixer truck having a semi-trailer W equipped with a concrete mixer mechanism having a drum 100 of (9 t) and a tractor 200 to which the semi-trailer W is coupled. That is, according to this embodiment, the volume of ready-mixed concrete (4.3 to 4.5 m) that can be transported by a conventional large-type mixer truck is 3 ) it can carry about twice the volume of ready-mixed concrete. As a result, according to this embodiment, for example, at a construction site that uses a large amount of concrete, ready-mixed concrete can be transported using half the number of vehicles compared to when using large concrete mixer trucks of the conventional technology, thereby reducing costs and preventing traffic congestion around the construction site. Furthermore, the semi-trailer mixer truck of this embodiment can transport larger amounts of concrete than conventional large-type concrete mixers, which not only contributes to reducing carbon dioxide emissions but also addresses the current problem of a shortage of drivers.

[0041] Furthermore, according to this embodiment, a large-capacity "9m" semi-trailer can be mounted on a general semi-trailer with a straight frame. 3Compared to when a tank is installed, the vehicle's longitudinal length can be made shorter, making it easier to drive and allowing it to reach narrow sites.

[0042] As described above, according to this embodiment, it is possible to provide a semi-trailer type mixer truck and a semi-trailer equipped with a concrete mixer mechanism that can transport larger amounts of ready-mixed concrete than conventional mixer trucks and that takes driving operability into consideration.

[0043] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the present invention. For example, in the above-described embodiment, the capacity of the tank 100 is 9 m 3 " However, this is just one example. [Explanation of symbols]

[0044] W...Semi-trailer 7, 8...wheels 9...Tail lamp 10...Mainframe 11...Rear end side - frame section 12...Intermediate frame section 13...Cobra neck 13a...Step 13b…Straight section 13c...Tapered section 43...Mounting base 44...Coupling pin 100...drums 101...Front support base 102...Rear support stand 110...Rotation drive mechanism 130...Hopper 135...Scoop 140...Shoot 145...Water tank 200...Tractor 201…Cabin 203...Wheel 210...rear of the vehicle

Claims

1. A semi-trailer mixer truck having a semi-trailer on which a concrete mixer mechanism equipped with a large-capacity drum for storing ready-mixed concrete is mounted, and a tractor to which the semi-trailer is connected, The drum is at least 9 m ３ It has a capacity of The semi-trailer includes a pair of left and right main frames in a plan view, which are arranged substantially parallel to each other with a predetermined gap between them, The main frame comprises a rear-end frame section extending linearly from its rear end toward its front end along the longitudinal direction of the semi-trailer, an intermediate frame section extending from the front end of the rear-end frame section toward the front in a plan view so as to gradually widen outward in a generally inverted V-shape, and a cobra neck section extending forward from the front end of the intermediate frame section, The cobra neck portion has a stepped portion extending upward at a substantially right angle from the front end of the intermediate frame portion, a straight portion extending linearly from the upper end of the stepped portion toward the front of the semi-trailer along the longitudinal direction, and a tapered portion that extends from the front end of the straight portion toward the front so as to gradually narrow inward in a plan view and has a substantially V-shape, The concrete mixer mechanism includes the drum, a front support base that supports a front end of the drum, a rear support base that supports a rear end of the drum, and a rotation drive mechanism that rotates the drum, The drum has a front end portion that is partially housed in a gap that is opened in a substantially inverted V shape in the intermediate frame portion of the semi-trailer and in gaps that are formed on the inside of the stepped portion and the straight portion of the cobra neck portion in a plan view, and is rotatably supported by the front support base and the rear support base in a state in which the front end portion is inclined so as to be positioned lower than the rear end portion, A semi-trailer mixer truck characterized in that the front support base is installed on a straight section of the cobra neck section formed at a position one step higher than the intermediate frame section.

2. A semi-trailer equipped with a concrete mixer mechanism equipped with a large-capacity drum for storing ready-mixed concrete, A pair of main frames are provided on the left and right sides in a plan view, and are arranged substantially parallel to each other with a predetermined gap between them, The main frame comprises a rear-end frame section extending linearly from its rear end toward its front end along the longitudinal direction of the semi-trailer, an intermediate frame section extending from the front end of the rear-end frame section toward the front in a plan view so as to gradually widen outward in a generally inverted V-shape, and a cobra neck section extending forward from the front end of the intermediate frame section, The cobra neck portion has a stepped portion extending upward at a substantially right angle from the front end of the intermediate frame portion, a straight portion extending linearly from the upper end of the stepped portion toward the front of the semi-trailer along the longitudinal direction, and a tapered portion that extends from the front end of the straight portion toward the front so as to gradually narrow inward in a plan view and has a substantially V-shape, The concrete mixer mechanism includes the drum, a front support base that supports a front end of the drum, a rear support base that supports a rear end of the drum, and a rotation drive mechanism that rotates the drum, The drum has a front end portion that is partially housed in a gap that is opened in a substantially inverted V shape in the intermediate frame portion of the semi-trailer and in gaps that are formed on the inside of the stepped portion and the straight portion of the cobra neck portion in a plan view, and is rotatably supported by the front support base and the rear support base in a state in which the front end portion is inclined so as to be positioned lower than the rear end portion, A semi-trailer equipped with a concrete mixer mechanism, characterized in that the front support base is installed on a straight section of the cobra neck section formed at a position one step higher than the intermediate frame section.

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