WO2009132554A1

WO2009132554A1 - Outrigger for concrete pump truck and the truck with the outrigger

Info

Publication number: WO2009132554A1
Application number: PCT/CN2009/071309
Authority: WO
Inventors: 易小刚
Original assignee: 三一重工股份有限公司
Priority date: 2008-04-28
Filing date: 2009-04-16
Publication date: 2009-11-05
Also published as: CN101301869B; CN101301869A

Abstract

An outrigger (171) for a concrete pump truck has a basic arm (171), and the basic arm has a supporting end hinged on the truck by a rotary shaft (174), and the rotary shaft is disposed to define an angle of less than 45 degrees between the shaft and the horizontal plane. The outrigger revolves around the shaft inwards when it is being folded from a supporting position. The angle between the basic arm and the vertical line of the horizontal plane is less than 80 degrees when the outrigger is in the final folded position. The type of the outrigger is single section or multisection. The folded position of the outrigger is upon the truck. When the outrigger revolves from the folded position to the supporting position, it moves in a vertical plane of the horizontal plane, therefore it will not be blocked by the things in the horizontal plane.

Description

The invention relates to a leg of a concrete pump truck and a concrete pump truck having the same. The application is filed on April 28, 2008 and submitted to the Chinese Patent Office, application number 200810095056.4, and the invention name is "the leg of a concrete pump truck". The priority of the Chinese Patent Application for a concrete pump truck having such a leg is incorporated herein by reference. Technical field

The present invention relates to the technology of a concrete pump truck, and more particularly to a leg of a concrete pump truck, and to a concrete pump truck having the above-described legs. Background technique

Pump Truck/Truck-mounted concrete pump requires support to achieve support during operation. The purpose is to increase the support area and support strength, and enhance the stability during pumping operation to avoid excessive work load. And cause overturning. The support device generally comprises two pairs of legs in front and rear, each leg having two positions of stowage and support. When the concrete pump truck is to be moved, it is necessary to fold up the legs to facilitate the movement. In this position, the legs are in the stowed state; when the concrete pump truck is constructed, the legs need to be unfolded to achieve support, and the legs are in this position. In a state of support. The above two states can ensure that the legs can play a supporting role without affecting the movement of the concrete pump truck.

In the prior art, the above-mentioned concrete pump truck legs are divided into two categories according to the position at which they are stowed: one is a swinging leg, the stowed position is on the side of the vehicle body; and the other is a telescopic leg, which is closed. The starting position is in the chassis.

In the prior art, the most commonly used concrete pump truck legs are in the form of a swing.

Please refer to FIG. 1 , which is a top plan view of a prior art concrete pump truck with a swinging leg.

As shown in the figure, the upper part of the body 101 of the concrete pump truck has a turntable 102. At the four corners of the body 101, a front right leg 103, a rear right leg 104, a rear left leg 105, and a front left are respectively mounted. The legs 106 each have a respective position change cylinder, and the position change cylinder drive legs are positionally shifted between the stowed position and the support position.

The solid line in the figure shows the state of the above-mentioned leg when it is in the fully deployed support position, the dotted line in the figure The state in which the above-described leg is in the stowed position is shown. It can be seen that each of the above-mentioned legs is gathered in a position close to the vehicle body 101 in the stowed position, which facilitates the movement of the concrete pump truck; when in the support position, the legs are respectively unfolded in four directions to obtain a large Supporting area; each leg is moved through its corresponding position to move the cylinder between the stowed position and the support position as needed.

The above-mentioned swinging leg has a problem in that during the swinging process, the range of motion of the end of the leg is large, and in many occasions, the working space is narrow, and the leg is not allowed to swing widely, which causes the leg to be completely unfolded, which is easy to cause Tipping over.

In order to solve the above problems, telescopic legs have appeared in the prior art.

Referring to Fig. 2, the figure shows a prior art concrete pump truck with a telescopic leg for the front leg. The figure shows a top view of the pump when it is in a support state.

As shown in the figure, the upper part of the body 201 of the concrete pump truck has a turntable 202. At four opposite corners of the body 201, a front right leg 203, a rear right leg 204, a rear left leg 205, and a front are respectively mounted. The left leg 206; wherein the two front legs, that is, the front right leg 203 and the front left leg 206, respectively have two rear legs of the telescopic moving track concealed in the chassis, that is, the rear right leg 204 The rear left leg 205 is swayed with a swinging leg.

When the telescopic front legs are in the stowed position, they are respectively included in the telescopic movement track in the chassis of the vehicle under the action of the corresponding telescopic cylinders; when the support is required, the corresponding telescopic cylinders are under the action of the corresponding telescopic cylinders Extend outward until the required support position.

The above-mentioned telescopic cylinder has the advantages of small space limitation during the unfolding process of the leg, and is easy to protrude in a narrow position, but the leg needs to set its running track in the vehicle body, which makes the chassis layout difficult, and the manufacturing is complicated. Problems can lead to increased costs. In addition, since the telescopic legs must be telescoped on their prescribed moving rails, the support points provided by these legs are limited, and the supporting surfaces cannot be flexibly set. Summary of the invention

In view of the above drawbacks, the technical problem to be solved by the present invention is to provide a leg of a concrete pump truck, which is more easily stretched to break through the limitation of the site, and does not cause a problem of difficulty in arranging the chassis of the telescopic leg, and It offers the possibility of a more flexible support surface. The present invention also provides a concrete pump truck using the above-described legs. The invention provides a leg of a concrete pump truck, the basic arm support end of the leg is hinged on a concrete pump truck body by a rotating shaft arranged at an angle of less than 45 degrees with a horizontal plane, and the leg is retracted from the support position. The axially inner side rotates; and when the leg reaches the final stowed position, the angle between the basic arm and the vertical line of the horizontal plane is less than 80 degrees.

Preferably, the leg is a single-legged leg including only a basic arm, and the center line of the basic arm is a straight line; in the supporting position, the basic arm is at an angle greater than 90 degrees above the vertical line of the horizontal plane, so that the branch The leg supports the vehicle body obliquely; when the leg is retracted from the support position, it rotates around the inner side of the rotation axis, specifically, rotates upward.

Preferably, the leg is a single-legged leg including only a basic arm, and the center line of the basic arm is a straight line; in the supporting position, the basic arm has a fixed angle with a vertical line of the horizontal plane; A lower struts that can be telescopic are mounted at the end.

Preferably, the leg is a single-legged leg including only a basic arm, and the center line of the basic arm is an arc; when the leg is retracted from the supporting position, the inner side of the rotating shaft is rotated, specifically upward Square rotation.

Preferably, the leg has two or more arms including a basic arm. Preferably, the adjacent arms of the legs are hinged; in the stowed position, the arms are folded together.

Preferably, an acute angle between the hinge axis between the respective arms and the axis of rotation of the base arm support end is less than or equal to 45 degrees.

Preferably, the hinge axis between the respective arms is perpendicular to the axis of rotation of the base arm support end.

Preferably, the support leg comprises an arm specifically of three or more sections, and wherein at least one of the inter-arm hinge axes parallel to the rotation axis of the basic arm support end, and one of the rotation axes perpendicular to the base arm support end Articulated shaft between arms.

Preferably, the center line of each arm of the leg is a straight line or an arc.

Preferably, a second force bar is respectively hinged on the adjacent arm; and the other ends of the two second force bars are hinged to each other and hinged to a power supply rod, and the other end of the power supply rod is hinged to the vehicle body.

Preferably, the contraction and deployment between adjacent arms is dependent on the arm-retracting cylinder; the arm-retracting cylinder One end is hinged on one of the adjacent arms, and the other end is hinged with the ends of the two two-force bars; the other ends of the two two-force bars are respectively hinged on the two adjacent arms.

Preferably, a rotary electric machine or an oil motor that drives the rotation of the hinge shaft is mounted on the hinge shaft between adjacent arms; the rotary motor or the oil motor drives the contraction or deployment of the arm.

Preferably, a worm wheel fixed to the hinge shaft is mounted on the hinge shaft between adjacent arms; a worm engaged with the worm wheel is mounted on one of the adjacent arms; a rotating electric machine and the worm The shaft drives the worm to rotate, thereby driving the worm wheel to rotate, thereby achieving contraction or deployment of adjacent arms.

Preferably, a gear fixed to the hinge shaft is mounted on the hinge shaft between the adjacent arms; on one of the adjacent arms, a rack that cooperates with the gear is mounted; a drive cylinder drives the The rack moves to drive the gear to rotate, thereby achieving contraction or deployment of adjacent arms.

Preferably, the adjacent arms are contracted or unfolded by a wire pulling mechanism.

Preferably, the respective arms of the legs are telescopic structures which are sleeved by the basic arm to the endmost arm layer by layer; and the center line of each arm is a straight line.

Preferably, the respective arms of the legs are telescopically framed by a basic arm to an endmost arm; and the center line of each arm is an arc.

Preferably, the number of arms of the leg is three or more sections, at least one of the adjacent arms has an articulated folded structure, and at least one of the telescopic structures is sleeved by a layer.

Preferably, the center line of the arm is a straight line or an arc.

Preferably, the support end hinge seat of the leg base arm is mounted on a support platform having a pivot axis perpendicular to the horizontal plane, the rotation shaft enabling the leg to rotate about an axis perpendicular to the horizontal plane.

Preferably, the leg basic arm supporting end is disposed at a lower portion of the vehicle body.

Preferably, the leg further has an auxiliary support rod or an auxiliary support plate, one end of which is hinged on the leg arm and the other end is hinged on the vehicle body, and one end of the auxiliary support rod or the auxiliary support plate has a sliding hinge The hinge shaft is disposed in the sliding slot; when the leg moves between the stowed position and the support position, the sliding hinge end slides in the sliding slot; and the sliding slot is provided with a locking mechanism to make the sliding hinge end It can be slid to a certain position and locked by the locking mechanism; the end of the leg has a lower struts that can be telescoped.

Preferably, the end position of the leg is mounted with a telescopic support cylinder. Preferably, the leg realizes the conversion of the stowed position and the support position by a telescopic position conversion cylinder; the cylinder is hinged to the vehicle body at one end, and the other end is hinged to the basic arm of the leg, and the cylinder is retracted, and the leg is pulled The leg moves to the stowed position, and the cylinder extends to push the leg to move toward the support position.

Preferably, the position change cylinder is hinged to one end of the vehicle body, specifically to a waist groove in the vehicle body; and the cylinder can slide in the waist groove when it is extended and contracted.

Preferably, the axis of the shaft of the leg of the leg and the connection of the body is parallel to the projection of the horizontal centerline of the body on the same horizontal plane.

Preferably, the axis of the pivot of the connecting leg base arm and the body is inclined with respect to the projection of the horizontal centerline of the vehicle body on the same horizontal plane.

Preferably, the projection axis of the connecting leg base arm and the vehicle body is inclined with respect to the horizontal horizontal line of the vehicle body on the same horizontal plane, and the specific angle is: when the leg is the front leg, the inclination angle is An acute angle that opens behind the vehicle body; when the leg is a rear leg, the angle of inclination is an acute angle that opens to the front of the vehicle body.

Preferably, the leg rotates about the rotating shaft, specifically upward.

The present invention also provides a concrete pump truck that pumps out the legs of the concrete pump truck of any of the above aspects.

Preferably, the legs of the concrete pump truck described above are for the front leg and/or the rear leg.

The concrete pump truck leg provided by the present invention, the base arm supporting end of the leg is hinged on the concrete pump body through a rotating shaft having an angle of less than 45 degrees with the horizontal plane, and the leg is wound around the rotating shaft when the leg is retracted from the supporting position The plane perpendicular to the horizontal plane rotates inwardly, and when the leg reaches the final stowed position, the angle between the basic arm and the vertical line of the horizontal plane is less than 80 degrees. It can be seen that the stowed position of the leg is located above the vehicle body, and the proper arrangement allows the leg to be placed using the space above the body. When the leg moves from the stowed position to the support position, it moves in a plane perpendicular to the horizontal plane and is not obstructed by obstacles on the horizontal surface; and the restriction of the concrete pump truck at the construction site comes from an obstacle on the horizontal surface, so the leg Compared with the prior art swinging legs, there is an advantage of more convenient and flexible deployment. In addition, since the leg utilizes the originally idle space of the upper portion of the concrete pump body, the leg arrangement is more convenient than the telescopic leg, and the leg is more convenient to be designed in the form of a flexible support point. The invention provides a plurality of extensions of the leg A preferred technical solution for the support points. DRAWINGS

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

1 is a top plan view of a prior art concrete pump truck with a swinging leg; FIG. 2 is a top plan view of a prior art mobile concrete pump truck with a telescopic leg for a front leg;

Figure 3 is a schematic view showing the leg of the first embodiment of the present invention in a stowed state when the leg is mounted on a concrete pump truck;

Figure 4 is a cross-sectional view taken in the direction of A in Figure 3;

Figure 5 is a schematic view showing the movement position of the leg of the first embodiment;

Figure 6 is a second schematic view showing the movement position of the leg of the first embodiment;

Figure 7 is a schematic view of the single arm leg in the form of a straight line with the center line of the basic arm in a support position;

Figure 8 is a schematic view showing another single arm leg in which the basic arm center line is in a straight line in a supporting position;

Figure 9 is a top plan view of a concrete pump truck in which the legs of the first embodiment are mounted in four directions, which is a state in which the legs are in a support position;

Figure 10 is a schematic view showing the direction of arrangement of the rotating shafts of the legs of Figure 9;

Figure 12 is a schematic view showing the direction of arrangement of the rotation axes of the legs of Figure 11;

Figure 13 is a schematic view showing the position of the hinge seat down;

Figure 14-1 is a schematic view showing the installation position of the hinged seat;

Figure 14-2 is a partial plan view of the rotatable support platform;

Figure 15 is a schematic view showing the end of the position shifting cylinder hinged to the leg provided on the waist groove of the vehicle body;

Figure 16 is a schematic structural view of a leg having a cylinder auxiliary support;

17 is a basic plan view of a folding multi-section arm leg according to a second embodiment of the present invention; FIG. 18 is a partial plan view showing the folding leg of FIG.

Figure 19 is a schematic view showing the supporting position of the folding leg of Figure 17; 20 is a schematic view of a technical solution for realizing the deployment of adjacent arms by using a four-lever structure; FIG. 21 is a schematic view showing a state in which the four-lever structure of FIG. 20 realizes the deployment of adjacent arms;

Figure 22 is a schematic view of a technical scheme for driving a two-force lever to deploy an adjacent arm by using a cylinder; Figure 23 is a schematic view of the technical scheme of the cylinder for driving the two-force rod to expand the adjacent arm of Figure 22;

Figure 24 is a schematic view of a technical solution for deploying adjacent arms by a rotary electric machine or an oil motor; Figure 25 is a schematic view showing a technical solution for driving the adjacent arms to expand and contract with a worm gear structure; Figure 26 is a third embodiment of the present invention. Figure 27 is a side view of the stowed state; Figure 27 is a side view of Figure 26;

Figure 28 is a schematic view showing a state in which the leg is rotated to the support position and the second arm is not yet deployed, according to the third embodiment of the present invention;

Figure 29 is a schematic view of a leg of a telescopic structure according to a fourth embodiment of the present invention; Figure 30 is a leg of a telescopic structure according to a fifth embodiment of the present invention;

Figure 31 is a leg of a telescopic structure according to a sixth embodiment of the present invention;

32 is a schematic view of a three-section arm leg having two forms of folding and telescoping according to a seventh embodiment of the present invention;

33 is a schematic view showing another three-section arm leg having two forms of folding and telescopic according to an eighth embodiment of the present invention;

Figure 34 is a view showing the position of the folding leg support which is retracted downwardly according to the ninth embodiment of the present invention;

Figure 35 is a stowed positional view of a ninth embodiment of the present invention. detailed description

A first embodiment of the present invention provides a single-section arm leg having only a basic arm.

Referring to Fig. 3, there is shown a schematic view of the concrete pump truck according to the first embodiment of the present invention when it is mounted on a concrete pump truck in a stowed state. The angle of view of the concrete pump truck is the side view direction of the concrete pump truck.

As shown, the (front left) leg 303 of the concrete pump truck is positioned above the platform of the body 301 in the stowed position, and the angle between the basic arm and the vertical line of the horizontal plane is substantially 0 degrees. In fact, when the leg is stowed, the angle between the basic arm and the vertical line of the horizontal plane can be positive or negative. The range is less than 90 degrees in both directions, and the angle may be considered to be at least less than 80 degrees in consideration of the fact that the angle is too large to lose the meaning of stowage. Of course, the above is only a numerical value taking into account extreme conditions. In fact, the angle between the basic arm and the vertical line of the horizontal plane when the leg is retracted is preferably around 0 degrees, and is generally obtained within 45 degrees. The benefit of folding the legs. If there is more space for arrangement above the platform of the body 301, it may be considered to tilt the leg when it is in the stowed position to achieve the purpose of lowering the highest point of the leg. In the stowed position illustrated, the highest point of the leg 303 does not exceed the highest point of the concrete pump truck; and it is necessary to ensure that the leg 303 does not interfere with the turntable 302.

Figure 4 is a partial cross-sectional view taken along line A of Figure 3;

As can be seen from FIG. 4, the leg 303 has an arc shape, that is, the center line of the basic arm is an arc, and the angle between the basic arm and the vertical line of the horizontal plane is 0 degree (or less than 80 degrees). ) refers to the angle between the center line of the basic arm and the vertical line of the horizontal plane near the support end 303-1. The support end 303-1 is hinged to the hinge seat 303-3 fixed above the platform of the vehicle body 301 by a horizontal rotating shaft 303-2, and the hinge seat 303-3 is a force receiving portion of the leg 303 supporting the vehicle body 301, so It should be firmly fixed to the body 301. In addition, a cylinder is shown, one end of which is hinged to the body 301, and the other end of which is hinged to the basic arm of the leg 303, the cylinder is used to drive the leg to switch between the stowed position and the support position, The position is changed to the cylinder 304.

Fig. 5 is a schematic view showing the movement position of the single-legged leg having only the basic arm. The figure shows the state when the leg is in the stowed position, at which time the position change cylinder 304 is in a contracted state; the support end 303-1 is hingedly fixed on the vehicle body 301 as a fixed point A; the position change cylinder 304 is fixedly hinged On the body 301, the point is a fixed point B; the position change cylinder 304 and the leg 303 have a hinge point C which is a fixed point on the leg 303. Among the above points, both points A and B are on the vehicle body, so that the distance between AB cannot be changed; both A and C are on the leg 303, so that the distance between the ACs cannot be changed, and the distance between the two points of BC can be The position change cylinder 304 is expanded and contracted to change. In Fig. 5, the position change cylinder 304 is in a contracted state, so that the distance between two points of BC is the shortest; since the point C is a fixed point on the leg 303, the leg 303 is at the position closest to the point B. Stand up perpendicular to the horizontal plane.

Please refer to FIG. 6 , which is the second schematic diagram of the movement position of the single-legged leg with only the basic arm. The figure shows the state when the leg is in the support position. The process of moving from the position of FIG. 5 to the position is as follows: the position change cylinder 304 is extended under the action of hydraulic pressure, that is, the BC distance becomes long, and the leg 303 is wound around the support end 303-1 under the force of the cylinder. The rotating shaft 303-2 is rotated downward toward the outside in a plane perpendicular to the horizontal plane to move to the supporting position; since the rotating shaft 303-2 is horizontally arranged, the rotating surface of the leg 303 is in a plane perpendicular to the horizontal plane. Figure 6 shows that the leg 303 is finally moved to the support position, and the support leg 303-4 at the end thereof is grounded; the support leg 303-4 can also be used with the support leg in the form of a lower struts, which can be It needs to protrude downward in a direction perpendicular to the horizontal plane to provide better support.

When the leg 303 is in the support position shown in FIG. 6, the position change cylinder 304 is contracted, so that the leg 303 moves around the rotating shaft 303-2 in the same plane perpendicular to the horizontal plane, and returns to FIG. The stowed position is shown so that the concrete pump truck can move.

In the above embodiment, the legs of the basic arm center line are curved, and the legs can provide a larger space under the legs, and the curved legs can form an arch support for the concrete pump truck. The internal stress distribution does not cause stress concentration problems and its service life is longer than that of straight legs.

Of course, the above-mentioned single-section arm legs can also be in the form of a straight line with the center line of the basic arm.

Please refer to Figure 7, which is a schematic view of the single-arm arm with the basic arm centerline in a straight line in the support position. As shown in the figure, after the movement reaches the support position, the leg 303 has an oblique direction, that is, an angle above the vertical line of the basic arm and the horizontal plane is greater than 90 degrees, and at this position, the support leg 303-4 at the end of the leg 303 Landing; the support legs 303-4 can also use the lower struts. The leg can constitute an oblique support to the vehicle body. When the legs of the concrete pump truck use the legs of this type, the support lines of the legs can form an intersection point in space, which is better. Support effect.

Please refer to Fig. 8. This figure is a schematic view of another single arm leg with a basic arm centerline in a straight line at the support position. Unlike the leg shown in Fig. 7, the rotation of the leg is restricted, and when it is moved to the support position, it can only be rotated and rotated about the rotating shaft 303-2 to a horizontal position; the supporting leg at the end can vertically protrude downward. Generally, a retractable lower struts are used. Of course, the leg can also be limited when rotated to a different angle from the vertical line of the horizontal plane.

Please refer to FIG. 9 , which is a concrete in which the legs in the above embodiment are mounted in four directions. A schematic view of the pump truck in a top view, which is the state when the legs are in the support position.

It can be seen from the figure that after unfolding, the front leg extends forward and outward, and the rear leg extends rearward and outward; the entire front and rear legs are formed to form an X-shaped shape, which can be obtained in a larger shape. Supporting area, this type of leg makes it more stable, and it is better to avoid the concrete pump truck tipping over.

Please refer to FIG. 10, which is a schematic view showing the direction of the rotation axis of the legs in FIG. It can be seen that the substantially horizontal rotating shaft 303-2 of the leg 303 of the basic arm supporting end 303-1 is hinged on the concrete pump body, and the extending direction thereof and the center line LL of the horizontal direction of the body 301 have a slope on the plane. The angle is specifically: when the leg is a front leg, the angle of inclination is an acute angle that opens to the rear of the vehicle body; when the leg is a rear leg, the angle of inclination is open to the front of the vehicle body Sharp angle. This kind of shaft arrangement can realize the above X-shaped support.

Referring to Fig. 11, there is shown a top plan view of a concrete pump truck in which the legs of the above embodiment are mounted in the other four directions, which is a state in which the legs are in the support position.

As can be seen from the figure, after deployment, the front legs extend outwardly perpendicular to the centerline of the vehicle body, and the rear legs extend outwardly perpendicular to the centerline of the vehicle body; the entire front and rear legs are expanded to form an H-shape.

Please refer to FIG. 12, which is a schematic view showing the direction of the rotation axis of the legs in FIG. It can be seen that the horizontal rotating shaft 303-2 of the leg 303 of the basic arm supporting end 303-1 is hinged on the concrete pump truck body, and the extending direction thereof is parallel to the horizontal line LL of the body 301 in the horizontal direction. The above-mentioned H-shaped support can be realized by the arrangement of the rotating shafts.

It should be noted that the above support form may also be deformed. Including, a pair of front legs project obliquely forward, and the rear legs extend perpendicularly to both sides; or vice versa. Different arrangements, the maximum support area and the shape of the support surface are also different, and the appropriate support surface shape should be selected according to the working characteristics of the concrete pump truck. Additionally, not all of the legs may use such legs as provided by the present invention, for example, the legs provided by the present invention may be used with the front legs, and the other legs of the prior art may be used for the rear legs; or vice versa.

Based on the above embodiments, some specific features can be improved to achieve better results. The following are some improvements.

Since the concrete pump truck has a height limitation during the exercise, the stowage position is used. When the leg form is raised above, it is necessary to consider that when the leg is in the stowed position, the height cannot exceed the limit height of the vehicle. However, in many cases a longer leg is required to achieve a larger area of support, for which a method of moving the hinge seat 303-3 down can be taken.

Please refer to Fig. 13, which is a schematic view of the leg which is moved down at the position of the hinge seat 303-3. As can be seen from FIG. 3, the mounting position of the hinge seat 303-3 is lower than the other parts of the body 301 in a downward position lower than the body platform, that is, in the lower part of the vehicle body. 131. Since the position is lower, the longer length legs 303 can be installed as compared with the mounting position shown in FIG.

In the above embodiment, the legs can only rotate in a plane perpendicular to the horizontal plane about the horizontally arranged rotating shaft 303-2. In fact, the legs may actually need to be rotated in a horizontal plane, so that the hinge seat 303-3 can be used for this purpose. Mounted on a platform with a rotating shaft perpendicular to the horizontal plane, even with a ball joint.

Please refer to Figure 14-1, which is a schematic view of the installation position of the hinged seat 303-3. As shown, the hinge mount 303-3 is mounted on a support platform 142 having a pivot 141 that is perpendicular to the horizontal plane on which the hinged position of the position change cylinder 304 is also on the platform. Please also refer to FIG. 14-2, which is a partial top view of the support platform 142. As can be seen, the support platform 142 can be rotated about a horizontal axis about the axis of rotation 141 perpendicular to the horizontal plane, the angle being limited by the body. The leg 303 is indirectly mounted on the support platform 142 via a hinged seat 303-3 so that the leg 303 can be rotated as the support platform 142 rotates to obtain a horizontal rotation of the angle.

The significance of the horizontal rotation described above is that the support point of one leg can be varied within a certain range of the plane to select the optimum support point depending on the situation. Under appropriate control, the legs 303 can be rotated simultaneously in a plane and a horizontal plane perpendicular to the horizontal plane, and finally moved to the space on the upper portion of the body 301 where the legs 303 are most suitably placed. Further movements include the ability to use the leg 303 to shift the support points in a horizontal plane to achieve the pumping requirements of the concrete pump truck for different fields.

In the first embodiment described above, the position shifting cylinder 304 assumes a certain supporting force when the leg is in the supporting position, and the supporting force simultaneously serves to prevent the leg from rotating about the rotating shaft 303-2. In the above solution, the hinge point of the position conversion cylinder 304 and the body 301 is a fixed point, so that In the stowed state and the extended state, since the force acting direction of the cylinder 304 changes, the force arm of the rotating shaft 303-2 also changes, and the force required to generate the same torque also changes. The fixed position of the position change cylinder 304 on the vehicle body tends to be unfavorable for supporting the support force if it is convenient to push the leg 303 to rotate from the stowed position to the support position. To this end, the fixed point of the position change cylinder 304 and the body 301 can be changed to a movable point. Figure 15 shows an alternative solution.

As shown in Fig. 15, the hinge point B to which the fixed position switching cylinder 304 is hinged to one end of the vehicle body is disposed in a waist groove 151 of the vehicle body 301. Thus, when the cylinder is expanded and contracted, it can slide in the waist groove 151, and the vertical distance between the output force line and the rotating shaft 303-2, that is, the force arm for outputting the force, changes due to the sliding.

As described above, in the above embodiment, when the leg is in the supporting state, the position switching cylinder 304 will bear a part of the supporting force, but the position switching cylinder 304 is mainly a motion driving mechanism, and the force is insufficient. Reasonable, appropriate measures should be taken for this purpose.

Please refer to FIG. 16, which shows a schematic structural view of a leg having a cylinder auxiliary support. As shown in the figure, an auxiliary support rod 161 hinged to the vehicle body 301 at one end is provided, and a plurality of positioning holes 162 are formed in the leg 301. When the leg 303 is moved toward the support position, after it is moved to the proper position, the auxiliary support bar 161 is inserted into the most suitable one of the positioning holes 162 by a pin fixed at the end thereof. Since the positioning hole 162 is discontinuous, the end of the leg 303 must be provided with a telescopic support leg 303-4 to compensate for the gap with the ground caused by the selection of the positioning hole 162. In this embodiment, the support foot 303-4 is generally in the form of a lower ram. In the above mechanism, the auxiliary support rod 161 can bear the supporting force, and the force of the position changing cylinder 304 can be greatly reduced or the supporting force can be not fully received. The auxiliary support bar 161 may also be provided with a pair of auxiliary support plates arranged in parallel, and are respectively inserted into the positioning holes 162 from both sides of the legs 303 in use.

The above-mentioned way of setting the auxiliary support bar is a simplified example. In fact, in order to achieve complete automatic, some improvements can be made. Specifically, the following solution can be used: the auxiliary support bar or the auxiliary support plate, one end hinged to the leg On the basic arm, the other end is hinged to the vehicle body, and one of the two ends is a sliding hinge, that is, the hinge shaft is disposed in the sliding groove; when the leg moves between the stowed position and the support position, the sliding hinge The end slides in the sliding groove; A locking mechanism is disposed in the movement groove to enable the sliding hinge end to be slid to a certain position and then locked by the locking mechanism. When the locking mechanism is unable to position the sliding hinge end in any position on the sliding groove, the end of the leg must also have a lower leg that can protrude downward, preferably using a lower struts.

Further, in the first embodiment described above, the position shift cylinder is used to drive the basic arm to rotate. Actually, the form of the cylinder may not be used. For example, the rotation of the basic arm can be realized in the form of mounting a motor on the rotating shaft. In this manner, those skilled in the art can use the common general knowledge to obtain a specific mounting method, which will not be described in detail herein.

- Description.

It should be noted that the horizontal arrangement of the rotating shaft 303-2 is a common design, but in some cases, the rotating shaft 303-2 can be arranged in a manner that is obviously inclined to the horizontal direction, for example, a range of less than 45 degrees from the horizontal plane. Arranged inside. This arrangement will undoubtedly cause the rotation of the legs not to be in a plane perpendicular to the horizontal plane, but in an inclined plane, for example, a rotation shaft arrangement that is tilted forward can be used, and when the legs are rotated upward, it may be generated. The effect of turning inward and backwards. This arrangement of the shaft has an effect on the supporting effect of the legs in the support position, and therefore, it is generally not the best solution, but it is not excluded to be used in special cases.

In the first embodiment described above, the leg is a single-legged leg containing only the basic arm. Generally, when the leg is moved from the support position to the stowed position, it is moved upward about the rotating shaft 303-2. However, for a single-legged leg that uses a longer lower struts and has a higher fixed position with the body, it can also be rotated downward after the lower struts are retracted, and finally, the legs 303 are hung at On the body 301.

In actual use, it is generally required that the length of the leg is long. If a single-legged leg is used, the height will exceed the limit height allowed by the vehicle when it is in the stowed position. To this end, the leg needs to be divided into a number of pitch arms. In order to place the leg.

In the prior art, there have been several types of multi-section arm legs of two or more arms, including folding and telescopic, and a combination of the two. The following embodiments focus on the differences between these legs and the legs provided by the first embodiment described above.

Please refer to FIG. 17, which shows a folding multi-section arm leg provided by a second embodiment of the present invention. Basic form. Shown in this figure is a folding leg comprising two arms and in a stowed position.

As shown, the leg includes a base arm 171 and a second arm 172 and a position shifting cylinder 173, wherein the base arm 171 and the second arm 172 are linear arms.

The base arm 171 is fixed to the vehicle body via a rotating shaft 174. Since the rotating shaft 174 is disposed substantially horizontally, the base arm 171 can be rotated inwardly about the rotating shaft 174 in a plane perpendicular to the rotating shaft 174. One end of the position change cylinder 173 is hinged on the base arm 171, and the other end of the cylinder is hinged to the vehicle body. At the position shown in the figure, the shift cylinder 173 is fully contracted.

One end of the second pitch arm 172 is hinged to one end of the basic arm 171 (this end is away from the hinge point of the basic arm 171 and the rotating shaft 174) through the inter-arm hinge shaft 175; the axis and the basic arm of the inter-arm hinge shaft 175 The axes of the rotating shafts 174 of the support end are parallel to each other; in fact, in other similar examples, the two shafts may also have a certain angle in space, but the angle is in the case described in the embodiment. At least less than or equal to 45 degrees. At the other end, that is, the end of the leg, a support leg 176 is attached, which can be used with the lower struts.

Referring to Figure 18, there is shown a partial cross-sectional plan view of the above folded leg. Viewed from a top view, the leg includes two legs that are arranged in a straight line.

Please refer to FIG. 19, which shows a schematic view of the above-mentioned folded leg support position. It can be seen that the position shifting cylinder 173 is fully extended, rotating the leg to a position extending obliquely downward to the side of the vehicle body, and the second pitch arm 172 is also deployed, and the supporting leg 176 at the end thereof is supported on the ground.

The above embodiment does not describe how the second section arm 172 is deployed. Actually, there are many possible forms, and several are listed below.

Referring to Figure 20, there is shown a technical solution for achieving deployment of adjacent arms using a four-lever structure.

As shown in the figure, on the two adjacent arms of the basic arm 171 and the second arm 172, a first two-force bar 2001-1 and a second two-force bar 2001-2 are respectively hinged, and the hinge points are respectively D, E; The other end of the above-mentioned two-force bar is hinged at a point with a power supply rod 2002, which is the intermediate end? . The other end of the supply rod 2002 is hinged to the vehicle body. When the position shifting cylinder 173 is extended, the basic arm 171 rotates with the rotation of the basic arm 171, since the center of rotation of the supply rod 2002 and the center of rotation of the basic arm 171 are different, The first two-force rod 2001-1 and the first When the two-force lever 2001-2 is pulled from the intermediate end F by the supply rod 2002, the angle between them changes, and the basic arm 171 and the second-section arm 172 are driven to expand. Fig. 21 shows the state after the expansion.

Referring to Figure 22, there is shown a technical solution for the use of a cylinder drive lever mechanism to deploy adjacent arms.

As shown in the figure, on the two adjacent arms of the basic arm 171 and the second arm 172, a first two-force bar 221-1 and a second two-force bar 221-2 are respectively hinged, and the hinge points are respectively G, H; The other end of the two second force rods is hinged to one end of an arm collecting cylinder 222, which is called the intermediate end head I. The other end of the arm retracting cylinder 222 is hinged to the base arm 171. When the position change cylinder is extended, the arm lift cylinder 222 is also extended by hydraulic driving, and the first and second force rods 221-1 and 221-2 are at the arm lift cylinder 222. Under the driving, the mutual angle changes to drive the basic arm 171 and the second pitch arm 172 to expand. Figure 23 shows the expanded state. The arm-retracting cylinder 222 can also be mounted on the second arm 172 in practice.

Referring to Figure 24, there is shown a technical solution for deploying adjacent arms with a rotary or oil motor. Specifically, a rotary electric machine (or oil motor) 241 that drives the rotation of the inter-arm hinge shaft 175 is mounted on the inter-arm hinge shaft 175 of the adjacent arm; the body of the rotary electric machine (or the oil motor) 241 is fixed to the base arm 171. The output shaft and the inter-arm hinge shaft 175 are fixedly connected, so that the rotation of the rotating motor 241 can drive the contraction or deployment of the adjacent arms.

Referring to Fig. 25, there is shown a technical solution for driving the adjacent arms to expand and contract with a worm gear structure. A worm wheel 251 integrally fixed to the hinge shaft is mounted on the inter-arm hinge shaft 175; a section of the adjacent arm (the basic arm 171 in the figure) is mounted to cooperate with the worm wheel 251 The worm 252 is driven by a rotating electric machine (not shown) coaxial with the worm to drive the worm 252 to rotate, thereby driving the worm wheel 251 to rotate, thereby achieving contraction or expansion of the adjacent arms.

It is also possible to achieve the contraction and deployment of adjacent arms in the form of rack and pinion. Specifically, a gear fixed integrally with the hinge shaft is mounted on an arm-to-arm hinge shaft of an adjacent arm; a rack engaged with the gear is mounted on one of the adjacent arms; and the driving cylinder drives the The rack moves to drive the gear to rotate, thereby achieving contraction or deployment of adjacent arms.

In addition, it is also possible to realize the contraction and expansion of the adjacent arms by the wire pulling mechanism, and the wire can be used for electricity. A known power source such as a machine or a cylinder is retracted.

In the second embodiment described above, the inter-arm hinge axis 175 between the basic arm 171 and the second pitch arm 172 is parallel to the rotation shaft 174 such that the deployment of the adjacent arms is in the vertical plane in which the basic arm 171 is located. When the inter-arm hinge shaft 175 is not parallel with the rotating shaft 174, it is generally required that the angle between the two shafts does not exceed 45 degrees, and at this time, the moving plane of each arm will have a certain angle. In fact, it is also possible to use a horizontally oscillating open type. A third embodiment of the present invention provides such a leg form.

Referring to Figure 26, there is shown a stowed state of the leg provided by the third embodiment of the present invention. The leg is also a folding leg comprising two arms. However, its inter-arm hinge axis 261 is perpendicular to the rotation axis 262. Figure 27 is a side elevational view of Figure 26 with the inter-arm hinge axis 261 visible.

Referring to Figure 28, there is shown the condition in which the leg has been rotated to the support position but the second arm has not yet deployed. It can be seen that the second arm of the second section must be oscillated around the inter-arm hinge axis 261 on a horizontal plane. The advantage of this form is that the leg that swings in the horizontal plane can select the branch in a larger range. The support points of the legs, so that the support surface can be provided more flexibly for the mobile machine.

The unfolding and contracting mechanism of the basic arm and the second pitch arm of this embodiment and the second embodiment have no region ij, which will not be described here.

When the number of arms is three or more, the two types of inter-branch hinge shafts of the second embodiment and the third embodiment described above can be mixed, and there are both an inter-arm hinge shaft parallel to the rotation shaft and an inter-arm hinge shaft perpendicular to the rotation shaft.

Further, the center line of the arms of the above-mentioned various folding multi-section arm legs is a straight line, and it is actually possible to completely use the curved legs in which the center line of the arm is an arc.

The legs provided in the above two embodiments are all legs which are unfolded by folding, and the fourth embodiment of the present invention provides a leg of a telescopic structure.

Referring to Figure 29, there is shown a leg of a telescoping structure comprising a base arm 291 and a second arm 292 having a straight centerline. The support end of the base arm 292 is hinged to the vehicle body via a rotating shaft 293. The second arm 292 is sleeved in the inner cavity of the basic arm 291 by the basic arm 291, and can be moved in the inner cavity of the basic arm 291 by an internal cylinder (not shown), including extending Or retract. In the figure, the basic arm 291 is rotated to the position of the oblique support. The ground is supported by the support legs 294 at its ends, which can also be used with the lower struts. Referring to FIG. 30, the figure shows a leg of a telescopic structure according to a fifth embodiment of the present invention. The telescopic structural leg includes a basic arm 3001 and a second pitch arm 3002 whose center line is straight, and a supporting end of the basic arm 3001 is hinged to the vehicle body via a rotating shaft 3003, and the second pitch arm 3002 is sleeved on the basic arm The inner cavity of the 3001 is movable in the inner cavity of the basic arm 3001, including extension or retraction, driven by an internal cylinder (not shown). However, the basic arm 3001 cannot be rotated to the position of the oblique support due to the limitation of the vehicle body or the like, and can only be rotated to the flat direction, and the ground must be supported by the extendable support leg 3004 at the end thereof. 3004 generally chooses the lower support cylinder.

Referring to FIG. 31, the figure shows a leg of a telescopic structure according to a sixth embodiment of the present invention. The telescopic structural leg includes a basic arm 311 and a second pitch arm 312 whose center line is an arc. The supporting end of the basic arm 311 is hinged to the vehicle body via a rotating shaft 313, and the second pitch arm 312 is sleeved in the The base arm 311 is moved in the inner cavity of the base arm 311 and driven by an internal cylinder (not shown), including extending or retracting. Since the basic arm 311 and the second pitch arm 312 are both curved, the leg can be rotated to the grounding position conveniently. The rotation angle of the rotating shaft 313 can be smaller than that of the fourth embodiment, and the leg can also be provided for the vehicle body. Shape change support for better support.

When the number of arms is more than three, the folding leg provided by the second embodiment or the third embodiment may be combined with the telescopic legs provided in the fourth to sixth embodiments to form a multi-section folding telescopic type. Outriggers.

Referring to Figure 32, there is shown a schematic view of a three-section arm leg having both telescopic and folded forms according to a seventh embodiment of the present invention. Wherein, the basic arm 321 and the second arm 322 are in a telescopic form; the second arm 322 and the third arm 323 are in a folded form hinged by an inter-arm hinge axis.

Referring to FIG. 33, there is shown another schematic view of a three-section arm leg having two forms of folding and telescoping according to an eighth embodiment of the present invention. Wherein, the base arm 331 and the second pitch arm 332 are folded in a hinged manner by an inter-arm hinge shaft, and the second section arm 332 and the third section arm 333 are in a telescopic form. In the above second embodiment to the eighth embodiment, the legs are rotated upwardly from the support position to the stowed position, so that the final legs stand on the platform of the body 301 when the final legs are in the stowed position. on. In fact, for a leg having more than two arms, when the hinge point of the leg and the body is high, the arms can be contracted first, so that the length of the contracted arm is smaller than the height of the hinge point to the bottom of the leg. Then use the downward rotation to close the arm. In this way, when the legs are in the stowed position, they are actually hung on a higher articulation point of the body. The following ninth embodiment shows one such example.

Referring to Figure 34, an expanded view of the legs provided for this embodiment. As can be seen from the illustration, the hinge arm 341 of the base arm 341 and the body is at a higher position; the inter-arm hinge axis 343 between the base arm 341 and the second arm 342 is located at an upper position of the contact end faces. Thus, when the arms are retracted, the second arm 342 will rotate upward. When the two arms are folded together, since the leg length is smaller than the height from the ground, the downward rotation does not hit the ground. The position change cylinder 345 is contracted to drive the leg to rotate downward. In the stowed position, the leg will be hung on the body through the hinge point 344, as shown in Figure 35.

Similarly, this stowed rotation mode can also be applied to the telescopic multi-section arm. The various legs and variations thereof provided by the above embodiments can be applied to various concrete pump trucks that require legs. The above-mentioned legs are generally used in pairs. For example, when the left and right front legs are all in the above-mentioned stowed position, the legs stand up above the body platform, or the left and right rear legs are all used in the above-mentioned stowed position. The legs that stand above the body platform can also be obtained in the above form, and will not be described here.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

OP090205 - 19- Claims

A leg of a concrete pump truck, characterized in that: the basic arm support end of the leg is hinged to the concrete pump body by a rotating shaft arranged at an angle of less than 45 degrees from the horizontal plane, and the leg is retracted from the support position Rotating inside the rotation axis; and when the leg reaches the final stowed position,

5 The angle between the basic arm and the vertical line of the horizontal plane is less than 80 degrees.

2. The leg of a concrete pump truck according to claim 1, wherein: said leg is a single leg comprising only a basic arm, and a center line of said basic arm is a straight line; The angle between the basic arm and the vertical line of the horizontal plane is greater than 90 degrees, so that the leg supports the vehicle body obliquely; when the leg is retracted from the support position, it rotates around the inner side of the rotation axis, specifically, rotates upward.

The leg of the concrete pump truck according to claim 1, wherein: the leg is a single-legged leg including only a basic arm, and a center line of the basic arm is a straight line; The basic arm has a fixed angle with a vertical line of the horizontal plane; the bottom end of the basic arm is mounted with a telescopic lower struts.

4. The leg of a concrete pump truck according to claim 1, wherein: said leg 15 is a single leg comprising only a basic arm, and a center line of the basic arm is an arc; When it is stowed from the support position, it rotates around the inner side of the rotation axis, specifically, rotates upward.

The leg of a concrete pump truck according to claim 1, wherein the leg has two or more arms including a basic arm.

6. A leg for a concrete pump truck according to claim 5, wherein: adjacent legs of said leg 20 are hinged; and in the stowed position, arms of said leg are folded together.

The leg of a concrete pump truck according to claim 6, wherein: an acute angle between the hinge axis between the arms and the axis of the shaft of the base arm support end is less than or equal to 45 degrees.

8. The leg of a concrete pump truck according to claim 6, wherein: the hinge axis between the respective 25 arms is perpendicular to the axis of the shaft of the base arm support end.

9. The leg of a concrete pump truck according to claim 6, wherein: said support leg comprises an arm specifically of three or more sections, and wherein at least one of said legs is parallel to said rotating shaft of said basic arm supporting end An inter-arm hinge shaft, and an inter-arm hinge shaft perpendicular to the rotation shaft of the base arm support end.

10. A leg for a concrete pump truck according to any one of claims 6 to 9, characterized in that the center line of each arm of the leg is a straight line or an arc.

11. The leg of a concrete pump truck according to any one of claims 6 to 9, wherein: on the adjacent arms, a two-force bar is respectively hinged; and the other ends of the two two-force bars are mutually Hinged and hinged to a power rod, the other end of which is hinged to the body.

12. A leg for a concrete pump truck according to any one of claims 6 to 9, wherein: the contraction and deployment between adjacent arms is dependent on the arm-retracting cylinder; one end of the arm-retracting cylinder is hinged at One of the adjacent arms is hinged at the other end with the ends of the two two-force bars; the other ends of the two two-force bars are respectively hinged on the two adjacent arms.

13. The leg of a concrete pump truck according to any one of claims 6 to 9, characterized in that: a rotary electric machine or an oil motor for driving the rotation of the hinge shaft is mounted on the hinge shaft between adjacent arms; Or the oil motor drives the contraction or deployment of the arm.

14. The leg of a concrete pump truck according to any one of claims 6 to 9, wherein: a worm wheel fixed to the hinge shaft is mounted on the hinge shaft between adjacent arms; In one of the sections, a worm engaged with the worm wheel is mounted; a rotating machine is coaxial with the worm, and the worm is driven to rotate, thereby driving the worm wheel to rotate, thereby achieving contraction or deployment of adjacent arms.

The leg of a concrete pump truck according to any one of claims 6 to 9, characterized in that: a gear fixed to the hinge shaft is mounted on the hinge shaft between adjacent arms; In one of the sections, a rack that cooperates with the gear is mounted; a drive cylinder drives the rack to move, thereby driving the gear to rotate, thereby achieving contraction or deployment of adjacent arms.

16. A leg for a concrete pump truck according to any one of claims 6 to 9, characterized in that: the adjacent arms are contracted or unfolded by a wire pulling mechanism.

17. The leg of a concrete pump truck according to claim 5, wherein: between the arms of the leg, a telescopic structure that is sleeved from the basic arm to the endmost arm is layered; and each arm The center line is a straight line.

18. The leg of a concrete pump truck according to claim 5, wherein: each of the arms of the leg is configured by a telescopic structure that is sleeved from the basic arm to the endmost arm layer by layer; and each arm The centerline is an arc.

19. The leg of a concrete pump truck according to claim 5, wherein: said branch The number of arms of the legs is three or more sections, and at least one of the adjacent arms has an articulated folded structure, and at least one of the telescopic structures is sleeved by a layer.

20. A leg for a concrete pump truck according to claim 19, wherein: the centerline of said arm is a straight line or an arc.

The leg of the concrete pump truck according to any one of claims 1 to 9, wherein the support end hinge of the base leg of the leg is mounted on a shaft having a rotation axis perpendicular to a horizontal plane. On the support platform, the shaft enables the legs to rotate about an axis perpendicular to the horizontal plane.

The concrete pump truck according to any one of claims 1-9, 17 to 20, characterized in that: the support arm support end of the leg is disposed at a lower portion of the vehicle body.

The leg of the concrete pump truck according to any one of claims 1-9, 17 to 20, characterized in that the leg further has an auxiliary support rod or an auxiliary support plate, one end of which is hinged to the leg arm The other end is hinged to the vehicle body, and one end of the auxiliary support rod or the auxiliary support plate has a sliding hinge, and the hinge shaft is disposed in the sliding groove; when the leg moves between the stowed position and the support position The sliding hinge end slides in the sliding groove; a locking mechanism is disposed in the sliding groove, so that the sliding hinge end can be slid to a certain position and then locked by the locking mechanism; the end of the leg has a telescopic Lower struts.

The leg of a concrete pump truck according to any one of claims 1, 2, 4-9, and 17 to 20, characterized in that: the end of the leg is provided with a support cylinder capable of telescopic expansion.

The leg of a concrete pump truck according to any one of claims 1-9, 17 to 20, characterized in that: the leg is converted by a telescopic position change cylinder for the stowed position and the support position One end of the cylinder is hinged to the vehicle body, and the other end is hinged to the basic arm of the leg. When the cylinder is retracted, the leg is pulled to move to the stowed position, and the cylinder is extended to push the leg to move to the support position.

The leg of the concrete pump truck according to claim 25, wherein: the position conversion cylinder is hinged to one end of the vehicle body, specifically hinged in a waist groove on the vehicle body; The waist groove slides.

27. The leg of a concrete pump truck according to any one of claims 1-9, 17 to 20, characterized in that: the axis of the connecting shaft of the leg and the connecting body on the vehicle body and the horizontal center line of the vehicle body are The projections on the same horizontal plane are parallel.

The leg of the concrete pump truck according to any one of claims 1-9, 17 to 20, characterized in that: the axis of the shaft of the connecting leg and the connecting body on the vehicle body and the horizontal center line of the vehicle body are The projection on the same horizontal plane is tilted.

29. The leg of a concrete pump truck according to claim 28, wherein: the projection axis of the connecting base leg and the body is inclined with respect to the horizontal horizontal line of the vehicle body on the same horizontal plane, the specific angle Yes: When the leg is a front leg, the angle of inclination is an acute angle that opens to the rear of the vehicle body; when the leg is a rear leg, the angle of inclination is an acute angle that opens to the front of the vehicle body.

30. The leg of a concrete pump truck according to claim 1, wherein: said leg rotates about said rotating shaft, specifically upward.

A concrete pump truck, characterized in that: the leg of the concrete pump truck according to any one of the above claims 1 to 30.

32. Concrete pump truck according to claim 31, characterized in that the legs of the concrete pump truck are used for front legs and/or rear legs.