JP7554313B2 - Construction Machinery - Google Patents

Description

The present invention relates to construction machinery, such as hydraulic excavators, equipped with a gas engine that uses gas fuel, such as LPG.

Hydraulic excavators, a typical example of construction machinery, generally use diesel engines that run on diesel fuel. However, in recent years, from the perspective of protecting the global environment, strict exhaust gas regulations have been set for diesel engines to reduce the amount of harmful substances contained in the exhaust gas. This has resulted in diesel engines having complex structures and requiring the installation of new devices, which has led to increased costs. As a result, some hydraulic excavators are equipped with gas engines that run on gas fuels such as LPG (Liquefied Petroleum Gas), whose exhaust gas contains fewer harmful substances than diesel engines.

A hydraulic excavator equipped with a gas engine comprises a self-propelled lower travelling body, an upper rotating body rotatably mounted on the lower travelling body, and a working device mounted on the front side of the upper rotating body in the front-rear direction. The upper rotating body comprises a rotating frame with the working device mounted on the front side, a gas engine fueled by gas mounted on the rear side of the rotating frame, a building located on the left side of the rotating frame and in which the operator's seat is mounted, a hydraulic oil tank located on the right side of the rotating frame for storing hydraulic oil, and a gas container for storing gas fuel to be supplied to the gas engine.

Here, some hydraulic excavators equipped with a gas engine are configured so that a gas container is placed on a rotating frame located to the side of the building, and a hydraulic oil tank is placed above the gas container (Patent Document 1).

Japanese Patent Application Publication No. 6-320968

Gas containers are made of high-strength metal so that they can withstand high internal pressure, which makes them heavy. Gas containers are transported by lifting them by hand or hoisting them with a crane. In this case, in a configuration in which the hydraulic oil tank is located above the gas container as in Patent Document 1, the gas container must be moved sideways to avoid the hydraulic oil tank when installing or removing the gas container. This creates a problem in that replacing the gas container requires time and effort.

The present invention has been made in consideration of the problems with the conventional technology described above, and the object of the present invention is to provide a construction machine that can improve the workability when replacing gas cylinders.

The present invention is a construction machine comprising a self-propelled lower running body, an upper rotating body rotatably mounted on the lower running body, and a working device mounted on the front side of the upper rotating body in the front-rear direction, the upper rotating body being equipped with a rotating frame on the front side of which the working device is mounted, a gas engine fueled by gas mounted on the rear side of the rotating frame, and a gas container for storing gas fuel to be supplied to the gas engine, the construction machine being characterized in that it is equipped with a gas supply pipe that connects the gas container to the gas engine and supplies gas fuel from the gas container to the gas engine, and a vaporizer that is mounted in the gas supply pipe and vaporizes the gas fuel, the gas container being mounted across the front-rear direction of the upper rotating body, and the vaporizer being positioned at a rear position of the gas engine.

The present invention improves the ease of use when replacing gas containers.

FIG. 1 is a left side view showing a hydraulic excavator according to an embodiment of the present invention, as viewed from the left side. FIG. 2 is a front view showing the hydraulic excavator from the front side with the working implement omitted. FIG. 2 is a perspective view showing an upper rotating body with the cab box, the driver's seat, and a portion of the exterior cover omitted. FIG. 2 is a perspective view showing a gas engine, a vaporizer, a gas container bracket, a gas container, and a gas supply pipeline mounted on a revolving frame. FIG. 2 is a perspective view showing a state in which a vaporizer, a gas container bracket, a gas container, and a gas supply pipe are provided on a rotating frame. FIG. 13 is a perspective view showing a state in which a vaporizer is provided on a rotating frame. FIG. 4 is an enlarged perspective view of the gas container bracket. FIG. 2 is a block diagram showing the relationship between a gas engine, a vaporizer, and a gas container.

Below, a crawler-type hydraulic excavator will be taken as an example of a representative example of a construction machine according to an embodiment of the present invention, and will be described in detail with reference to Figures 1 to 8. Note that in this embodiment, the case where LPG (Liquefied Petroleum Gas) is used as the gas fuel is illustrated.

In FIG. 1, the hydraulic excavator 1 is equipped with a self-propelled crawler-type lower track 2, an upper rotating body 3 that is rotatably mounted on the lower track 2, and a work device 4 that is mounted on the front side of the upper rotating body 3 in the forward and rearward directions so that it can be raised and lowered, and that performs work such as excavating soil and sand.

As shown in Figures 2 to 4, the upper rotating body 3 is configured to include a rotating frame 5, a gas engine 7, a cab 9 as a building, a hydraulic oil tank 10, and a gas container 21, which will be described later. Here, the upper rotating body 3 has width dimensions in the left and right directions that are approximately equal to the vehicle width of the lower traveling body 2. The upper rotating body 3 also has a counterweight 6, which will be described later, formed in an arc shape. As a result, the hydraulic excavator 1 is configured as a rear ultra-tight swing type hydraulic excavator in which the outer peripheral surface of the counterweight 6 fits within approximately 120% of the vehicle width dimension of the lower traveling body 2 when the upper rotating body 3 swings on the lower traveling body 2.

As shown in Figures 5 and 6, the swivel frame 5 is made of a thick steel bottom plate 5A extending in the front-rear direction, a left vertical plate 5B and a right vertical plate 5C standing on the bottom plate 5A and extending in the front-rear direction with a gap between them, and approaching each other toward the front side, an upper plate 5D extending from the front-rear middle of the left vertical plate 5B and the right vertical plate 5C toward the front side on the upper part of the left vertical plate 5B and the right vertical plate 5C, a left side frame 5E arranged with a gap to the left of the left vertical plate 5B and extending in the front-rear direction while curving, and a right side frame 5F arranged with a gap to the right of the right vertical plate 5C and extending in the front-rear direction while curving.

The front parts of the bottom plate 5A, the left vertical plate 5B, the right vertical plate 5C and the top plate 5D protrude forward and form a support part 5G. The working device 4 is attached to this support part 5G so that it can swing left and right. The rotating frame 5 has a horizontal plate 5H that stands upright, extending left and right on the bottom plate 5A between the rear end of the left vertical plate 5B and the rear end of the right vertical plate 5C.

An engine support frame 5J is provided on the rear side of the revolving frame 5, located below the gas engine 7 described below. The engine support frame 5J is made up of a left vertical frame portion 5J1 and a right vertical frame portion 5J2 that extend forward and backward with a gap between them in the left and right directions, and a rear vertical frame portion 5J3 that extends left and right and connects the rear end of the left vertical frame portion 5J1 to the rear end of the right vertical frame portion 5J2.

The engine support frame 5J also has multiple, for example, four, engine brackets 5J4 for mounting the gas engine 7, spaced apart in the front-rear and left-right directions. Furthermore, the rear vertical frame portion 5J3 has a vaporizer bracket 5J5 located at the rear of the gas engine 7 for mounting the vaporizer 23 described below.

As shown in Figures 1 and 3, the counterweight 6 is provided at the rear of the revolving frame 5 to balance the weight with the working device 4. The counterweight 6 is formed as an arc-shaped heavy object with the central portions on the left and right sides protruding rearward. The counterweight 6 is placed on the revolving frame 5 so that the turning radius of the upper revolving body 3 is small.

As shown in FIG. 4, the gas engine 7 is attached to the rear side of the revolving frame 5, specifically, to each engine bracket 5J4 of the engine support frame 5J that forms the revolving frame 5. As a result, the gas engine 7 is provided on the upper side of the engine support frame 5J, rearward of the horizontal plate 5H. The gas engine 7 uses LPG (liquefied petroleum gas) as a gas fuel. The gas engine 7 is mounted on the revolving frame 5 in a horizontally placed state extending in the left and right directions. Here, the gas engine 7 is equipped with a water jacket (not shown) through which engine cooling water flows. The water jacket is connected to a radiator of the heat exchanger. The water jacket is also connected to a vaporizer 23, which will be described later.

A hydraulic pump 8 is attached to the left side of the gas engine 7. This hydraulic pump 8 discharges hydraulic oil supplied from a hydraulic oil tank 10 (described below) as pressurized oil. Meanwhile, a heat exchanger (not shown) consisting of a radiator, oil cooler, etc. is disposed on the right side of the gas engine 7.

As shown in Figures 1 and 2, the cab 9 as a building is located in front of the gas engine 7 and on the left side of the revolving frame 5. The cab 9 is composed of a floor member 9A that covers the top of the gas engine 7 (hydraulic pump 8) from the front of the revolving frame 5, a box-shaped cab box 9B provided on the floor member 9A, and a driver's seat 9C located inside the cab box 9B and provided on the floor member 9A. A door 9B1 (see Figure 1) for entering and exiting the driver's cab is provided on the left side of the cab box 9B so that it can be opened and closed. Furthermore, as shown in Figure 2, the right side of the floor member 9A and the cab box 9B forms a gas container storage room 14, which will be described later.

As shown in FIG. 3, the hydraulic oil tank 10 is located on the right side of the revolving frame 5. The hydraulic oil tank 10 is formed as a rectangular parallelepiped container extending upward and downward, and stores hydraulic oil therein to be supplied to the hydraulic pump 8. Here, the hydraulic oil tank 10 is disposed at a predetermined distance from the cab 9. As a result, a gas container storage chamber 14 is provided between the cab 9 and the hydraulic oil tank 10.

The exterior cover 11 covers the gas engine 7, hydraulic oil tank 10, etc., which are mounted on the revolving frame 5. The exterior cover 11 is composed of a left cover 12, a right cover 13, etc. The left cover 12 covers the area between the left side frame 5E of the revolving frame 5 and the cab 9 in the front-rear direction, and also covers the left side of the hydraulic pump 8.

The right cover 13 is composed of a side cover part 13A that covers the right side, a partition cover part 13B that is located on the left side of the hydraulic oil tank 10 and extends forward and backward, an upper cover part 13C that can be opened and closed to cover the space between the side cover part 13A and the partition cover part 13B, and a rear cover part 13D that is located behind each of the cover parts 13A to 13C and covers the heat exchange device, etc.

Next, we will explain in detail the configuration of the gas container storage chamber 14, which is a characteristic feature of this embodiment.

The gas container storage room 14 is located between the cab 9 and hydraulic oil tank 10, which form the building, and is provided on the revolving frame 5 with the top and front open. The gas container storage room 14 forms a space for arranging the gas container bracket 15 and gas container 21 described below. The lower side of the gas container storage room 14 is partitioned by the revolving frame 5, the left side is partitioned by the right side surface of the cab 9, and the right side is partitioned by the partition cover part 13B of the right cover 13. Meanwhile, the upper side and front side of the gas container storage room 14 are open, and the gas container 21 is removably attached to the gas container storage room 14. The gas container storage room 14 is also formed at a position lower than the upper position of the counterweight 6.

This allows the gas container 21 to be attached to and removed from the gas container storage chamber 14 from the upper and front sides of the upper rotating body 3. Specifically, when the gas container 21 is lifted by hand or hoisted using a crane, the gas container 21 can be lowered from above and attached to the gas container storage chamber 14, which is open at the top. It can also be lifted upwards and removed. Moreover, since the gas container storage chamber 14 is located between the cab 9 and the hydraulic oil tank 10 and toward the center of the upper rotating body 3, there is no risk of the gas container 21 fixed to the gas container storage chamber 14 colliding with surrounding obstacles during the rotating operation.

The gas cylinder bracket 15 stably fixes the gas cylinder 21 to the gas cylinder storage chamber 14. The gas cylinder bracket 15 is provided on the right front side of the rotating frame 5. The gas cylinder bracket 15 is composed of a support member 18, a fixing member 19, and a regulating member 20, which will be described later. The front and rear base plates 16 and 17, which form the base of the gas cylinder bracket 15, are erected and extend left and right with a gap between them in the front and rear directions, and are fixed to the bottom plate 5A and top plate 5D of the rotating frame 5.

The support member 18 is formed as an arc-shaped (U-shaped) plate with an axis extending in the front and rear directions. The support member 18 is integrally fixed to the upper part of each of the base plates 16, 17 by welding or the like. The support member 18 is formed using a semi-cylindrical plate with a curvature similar to the outer circumferential surface of the gas container 21 so that the gas container 21 fits stably and is positioned appropriately simply by placing the gas container 21 on it.

The fixing member 19 fixes the gas container 21 supported on the support member 18 between the fixing member 19 and the support member 18. The fixing member 19 is composed of two engagement holes 19A provided at the right end of the support member 18 with a gap in the front and rear directions, two belt fastening brackets 19B provided at the left end of the support member 18 protruding upward so as to correspond to the engagement holes 19A, and a belt 19C having one end in the length direction hooked onto the engagement holes 19A and a screw portion 19C1 at the other end in the length direction inserted into the upper part of the belt fastening bracket 19B. The belt 19C has a nut 19D screwed to the tip of the screw portion 19C1 that penetrates the belt fastening bracket 19B. As a result, the fixing member 19 can fix the gas container 21 supported on the support member 18 between the support member 18 by tightening the nut 19D.

The restricting member 20 is provided on the front base plate 16. The restricting member 20 restricts the movement of the gas container 21 supported on the support member 18 toward the front side of the revolving frame 5. The restricting member 20 has a lower end attached to the front base plate 16 and an upper end extending upward beyond the lowermost part of the support member 18. When the gas container 21 supported on the support member 18 attempts to move forward, the restricting member 20 abuts the upper part 20A against the container body 21A of the gas container 21, thereby preventing the gas container 21 from shifting position toward the front side of the revolving frame 5.

The gas container 21 is detachably arranged in the gas container storage chamber 14 (gas container bracket 15). The gas container 21 stores LPG to be supplied to the gas engine 7. The gas container 21 is a transportable tank that can be attached and detached by hand or a crane when refueling. The gas container 21 is composed of a container body 21A made of a cylindrical sealed container, a cock 21B that is provided at the center position on one side of the container body 21A in the longitudinal direction and adjusts the amount of LPG supplied, and a cylindrical protector 21C that is provided on one end side of the container body 21A and surrounds the cock 21B. The protector 21C has large openings 21C1 formed at multiple locations in the circumferential direction, for example, two locations facing each other in the radial direction. As a result, one side of the opening 21C1 of the protector 21C is a rod-shaped handle 21C2. The upper part 20A of the regulating member 20 is inserted into the opening 21C1 of the protector 21C.

The gas container 21 is attached to the gas container bracket 15 (gas container storage chamber 14) in a horizontal position with the cock 21B facing the front of the rotating frame 5. This attachment structure allows the gas container 21 to be securely fixed with a simple configuration. In addition, the gas supply pipe 22 can be easily connected to and disconnected from the cock 21B, and the cock 21B can be easily operated.

The gas supply pipe 22 is provided between the gas container 21 and the gas engine 7. The gas supply pipe 22 supplies LPG from the gas container 21 to the gas engine 7. One end (upstream part) of the gas supply pipe 22 in the longitudinal direction is connected to the cock 21B of the gas container 21, and the other end (downstream part) of the gas supply pipe 22 in the longitudinal direction is connected to a fuel injection device (not shown) of the gas engine 7. In addition, a vaporizer 23, which will be described later, is provided midway through the gas supply pipe 22.

As shown in FIG. 5, the gas supply pipe 22 is connected to the vaporizer 23 from the gas container 21 through the inside of the engine support frame 5J of the revolving frame 5, i.e., the underside of the gas engine 7. This allows the LPG flowing through the gas supply pipe 22 to be warmed by the heat generated by the gas engine 7, promoting vaporization. In addition, in cold regions, when restarting the vehicle after stopping, LPG kept warm by the heat of the gas engine 7 can be supplied to the gas engine 7, and the gas engine 7 can be started stably with sufficiently vaporized LPG.

The vaporizer 23 is disposed at the rear of the gas engine 7, that is, attached to the vaporizer bracket 5J5 of the engine support frame 5J that constitutes the revolving frame 5. The vaporizer 23 is provided midway through the gas supply pipe 22. The vaporizer 23 vaporizes the LPG supplied to the gas engine 7 through the gas supply pipe 22. The vaporizer 23 uses the engine coolant of the gas engine 7 as a heat source for vaporizing the LPG. That is, as shown in FIG. 8, the vaporizer 23 is connected to the water jacket of the gas engine 7 through the coolant pipes 23A and 23B.

The hydraulic excavator 1 according to this embodiment has the configuration described above, and the operation of this hydraulic excavator 1 will now be described.

First, the operator gets into the cab 9, sits in the driver's seat 9C, and starts the gas engine 7. In this state, the operator can move the hydraulic excavator 1 forward or backward by operating the operating lever for travel. In addition, the operator can operate the working device 4 and the like to perform work such as excavating soil and sand by operating the operating lever for work.

Next, an example of the refilling work of LPG as gas fuel will be described. First, the empty gas container 21 attached to the gas container bracket 15 is removed. In this case, the cock 21B is closed, and then the gas supply line 22 is removed from the cock 21B. In addition, the nut 19D of the fixing member 19 of the gas container bracket 15 is loosened to release the gas container 21 from the belt 19C. Once the gas container 21 is released from the restraint, the handle 21C2 of the protector 21C is grasped to lift the gas container 21 and remove it from the gas container bracket 15. Alternatively, a wire or hook is attached to the handle 21C2, and the gas container 21 is lifted and removed using a crane.

After removing the empty gas container 21 from the gas container bracket 15, the gas container 21 filled with LPG can be placed sideways on the support member 18 of the gas container bracket 15 and attached to the gas container storage chamber 14 by performing the reverse procedure of the removal procedure described above. When attaching and detaching the gas container 21, the gas container 21 can be easily attached and detached because the mounting position of the gas container bracket 15 is low and close to the front side of the upper rotating body 3.

Thus, according to this embodiment, the space between the cab 9, which is located on the left side of the revolving frame 5 and has the driver's seat 9C, and the hydraulic oil tank 10, which is located on the right side of the revolving frame 5 and stores hydraulic oil, is a gas container storage chamber 14 that is open on the top and front. A gas container 21 that stores LPG (gas fuel) to be supplied to the gas engine 7 is removably attached to the gas container storage chamber 14.

Therefore, there is no risk of the gas container 21 colliding with surrounding obstacles when the upper rotating body 3 rotates. In addition, since the gas container storage chamber 14 is located at a low position between the cab 9 and the hydraulic oil, the gas container 21 can be easily replaced without climbing to a high position. Moreover, since the gas container storage chamber 14 is located with the top and front sides open, the gas container 21 attached to the gas container storage chamber 14 can be grabbed and lifted by hand or hoisted using a crane. Also, the gas container 21 can be lowered from above and attached.

As a result, the gas container 21 can be protected from damage caused by collisions with surrounding obstacles, improving its durability. In addition, the ease of use when replacing the gas container 21 can be improved.

The gas container 21 is provided with a cock 21B for adjusting the amount of gas fuel supplied. The gas container 21 is attached to the gas container storage chamber 14 with the cock 21B facing the front of the revolving frame 5. This allows the gas container 21 to be laid down on its side with the cock 21B positioned at the front, so it can be securely fixed with a simple structure. In addition, the cock 21B positioned at the front makes it easy to connect and disconnect the gas supply pipe 22 from the ground, and the cock 21B can be easily operated.

The gas container 21 and the gas engine 7 are connected by a gas supply line 22 for supplying LPG as a gas fuel from the gas container 21 to the gas engine 7, and the gas supply line 22 is provided with a vaporizer 23 for vaporizing the LPG. The vaporizer 23 is disposed at a rear position of the gas engine 7. The gas supply line 22 connected to the vaporizer 23 disposed at the rear of the gas engine 7 passes around the gas engine 7, so that the heat generated by the gas engine 7 can be used to promote the vaporization of the LPG. In addition, in cold regions, the LPG in the gas supply line 22 can be kept warm, and the gas engine 7 can be started stably.

The gas supply pipe 22 passes under the gas engine 7 and is connected to the vaporizer 23. This allows the gas supply pipe 22 to be positioned close to the gas engine 7, which can promote the vaporization of LPG and keep the LPG warm.

The gas container storage chamber 14 is provided with a gas container bracket 15 located on the swivel frame 5. This gas container bracket 15 is configured to include a support member 18 that extends around the gas container 21 and supports the gas container 21 from below, a fixing member 19 that fixes the gas container 21 supported on the support member 18 between the support member 18, and a restricting member 20 that restricts the movement of the gas container 21 toward the front of the swivel frame 5.

Therefore, the support member 18 can support the gas container 21 from below, and the fixing member 19 can fix the gas container 21 supported on the support member 18 between the support member 18 and the fixing member 19. In addition, the restricting member 20 can restrict the gas container 21 fixed on the support member 18 by the fixing member 19 from moving to the front side of the rotating frame 5. This allows the gas container 21 to be stably fixed even when working on uneven ground where vibrations occur or on slopes where tilts occur.

The revolving frame 5 is provided with an engine support frame 5J, which is composed of a left vertical frame portion 5J1, a right vertical frame portion 5J2, and a rear vertical frame portion 5J3 that is located below the gas engine 7 and extends forward and backward with a gap in the left and right directions. The gas supply pipe 22 is connected to the vaporizer 23 from the gas container 21 through the inside of the engine support frame 5J. Since the inside of the engine support frame 5J is below the gas engine 7, the LPG flowing through the gas supply pipe 22 can be warmed by the heat generated by the gas engine 7, and the vaporization of the LPG can be promoted. In addition, in cold regions, when restarting after stopping, LPG kept warm by the heat of the gas engine 7 can be supplied to the gas engine 7, and the gas engine 7 can be started stably with sufficiently vaporized LPG.

In the embodiment, an example has been described in which LPG (liquefied petroleum gas) is used as the gas fuel. However, the present invention is not limited to this, and for example, natural gas may be used as the gas fuel. In this case, the vaporizer can be omitted.

In the embodiment, a cab 9 equipped with a cab box 9B has been described as an example of a building. However, the present invention is not limited to this, and a canopy having a top surface (roof) that covers the upper part of the driver's seat may also be used as the building.

Furthermore, in the embodiment, a rear ultra-tight turning type hydraulic excavator 1 is used as an example of a construction machine. However, the present invention is not limited to this, and can also be applied to ultra-tight turning type hydraulic excavators, general hydraulic excavators in which the turning radius of the upper turning body protrudes beyond the vehicle width dimension of the lower running body, and the like. It can also be applied to construction machines equipped with wheel-type lower running bodies.

1. Hydraulic excavator (construction machinery)
2 Lower traveling body 3 Upper rotating body 4 Working device 5 Swing frame 5J Engine support frame 5J1 Left vertical frame portion 5J2 Right vertical frame portion 5J3 Rear vertical frame portion 7 Gas engine 9 Cab (building)
9C Driver's seat 10 Hydraulic oil tank 14 Gas cylinder storage chamber 15 Gas cylinder bracket 18 Support member 19 Fixing member 20 Restricting member 21 Gas cylinder 21B Cock 22 Gas supply line 23 Vaporizer

Claims (6)

The vehicle comprises a self-propelled lower traveling body, an upper rotating body rotatably provided on the lower traveling body, and a working device provided on the front side of the upper rotating body in the front-rear direction,
The upper rotating body is
A rotating frame having the working device provided on a front side thereof;
a gas engine that is provided on the rear side of the revolving frame and uses gas fuel;
A construction machine comprising a gas container for storing gas fuel to be supplied to the gas engine,
a gas supply line connecting the gas container and the gas engine and supplying gas fuel from the gas container to the gas engine;
a vaporizer provided in the gas supply line for vaporizing the gas fuel;
The gas container is provided across the front and rear directions of the upper rotating body,
A construction machine characterized in that the vaporizer is disposed at a rear position of the gas engine. 2. The construction machine according to claim 1,
The upper rotating body includes a gas container storage chamber that is open at the top and front,
A construction machine characterized in that the gas cylinder is detachably attached to the gas cylinder storage chamber. The construction machine according to claim 2,
The gas container is provided with a cock for adjusting the amount of gas fuel supplied,
A construction machine characterized in that the gas cylinder is attached to the gas cylinder storage chamber with the cock facing the front side of the revolving frame. 2. The construction machine according to claim 1,
A construction machine characterized in that the gas supply pipe passes under the gas engine and is connected to the vaporizer. The construction machine according to claim 2,
The gas container storage chamber is provided with a gas container bracket located on the rotating frame,
a gas cylinder bracket for supporting the gas cylinder from below and extending along the periphery of the gas cylinder; a fixing member for fixing the gas cylinder supported on the support member between the support member and the gas cylinder; and a regulating member for regulating movement of the gas cylinder toward the front of the rotating frame. 2. The construction machine according to claim 1,
The revolving frame is provided with an engine support frame that is located below the gas engine, has a left vertical frame portion and a right vertical frame portion that extend in the front-rear direction with a gap in the left-right direction, and a rear vertical frame portion that extends in the left-right direction and connects a rear end of the left vertical frame portion and a rear end of the right vertical frame portion,
A construction machine characterized in that the gas supply pipe runs from the gas container through the inside of the engine support frame and is connected to the vaporizer.

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