CN203391751U - Telescopic support leg and concrete pump truck with same - Google Patents

Abstract

The utility model provides a flexible landing leg and have its concrete pump truck. Wherein the telescopic leg includes: the first-stage supporting leg comprises a first upper cover plate and a first lower cover plate; the second-stage supporting leg is telescopically embedded in the first-stage supporting leg and comprises a second upper cover plate and a second lower cover plate; the first upper cover plate is provided with a locking device; the end of the first lower cover plate is provided with an upper convex part which protrudes upwards; the end part of the second lower cover plate, which is positioned in the first-stage leg, is provided with a downward convex part which protrudes downwards; when the second-stage supporting leg extends out of the first-stage supporting leg and extends to the right position, the end part, located in the first-stage supporting leg, of the second upper cover plate is abutted to the locking device, and the upper convex part is abutted to the lower convex part. The technical scheme of the utility model can extend the effective length after the two-stage landing leg extends to target in place under the condition that does not extend original two-stage landing leg.

Description

Telescopic outrigger and there is its concrete pump truck

Technical field

The utility model relates to construction machinery and equipment, in particular to a kind of telescopic outrigger and have its concrete pump truck.

Background technology

Concrete pump truck has telescopic outrigger conventionally, and telescopic outrigger is mutually socketed and combines by two-stage or supporting leg more than two-stage.It is outside that first order leg sleeve is connected on second stage supporting leg, and it is outside that second stage leg sleeve is connected on third stage supporting leg, by that analogy.When concrete pump truck is worked, by the effect of horizontal drive oil cylinder, second stage supporting leg stretches out from first order supporting leg, third stage supporting leg stretches out from the supporting leg of the second stage, make telescopic outrigger extend to certain effective length, and by a vertical oil cylinder, act on ground the stability while guaranteeing concrete pump truck work.When concrete pump truck travels, under the effect of horizontal drive oil cylinder, it is inner that second stage supporting leg is recovered to first order supporting leg, it is inner that third stage supporting leg is recovered to second stage supporting leg, now telescopic outrigger is retracted to the shortest length, make the spatial volume of concrete pump truck minimum, guarantee the crossing ability that travels of concrete pump truck.

Along with the jib length of concrete pump truck is more and more grown, jib weight is more and more heavier, in order to guarantee the car load of concrete pump truck, do not tumble, require the effective length of telescopic outrigger also more and more longer, and the space of regaining due to telescopic outrigger is restricted, so can not rely on, increase the effective length that the length of supporting legs at different levels self increases telescopic outrigger, from current analysis, the socket form between existing supporting legs at different levels is the principal element that affects the effective length of telescopic outrigger.

The two-stage telescopic outrigger shown in Fig. 1 and Fig. 2 of take is below example, analyzes the impact that supporting leg socket form causes telescopic outrigger effective length.

Fig. 1 and Fig. 2 are respectively the telescopic outrigger of concrete pump truck at the schematic diagram of retracted mode and extended configuration, wherein first order supporting leg 20 ' is hinged on landing leg underframe 10 ' by underframe bearing pin 11 ', first order supporting leg 20 ' is socketed on second stage supporting leg 30 ', vertically oil cylinder 40 ' is arranged on supporting leg 30’ end, the second stage, horizontal drive oil cylinder 50’ one end and first order supporting leg 20 ' are hinged, the other end and second stage supporting leg 30 ' are hinged, and the flexible drive second stage supporting leg 30 ' by horizontal drive oil cylinder 50 ' stretches out or retraction first order supporting leg 20 '.

In conjunction with referring to after Tu1， second stage supporting leg 30 ' retraction first order supporting leg 20 ', the shortest length that the horizontal throw between the central axis of the central axis of underframe bearing pin 11 ' and vertically oil cylinder 40 ' is telescopic outrigger, the shortest length of establishing telescopic outrigger is L1 '.

In conjunction with referring to Fig. 2, after second stage supporting leg 30 ' stretches out first order supporting leg 20 ' and stretches and put in place, first order supporting leg 20’Yu second stage supporting leg 30 ' has part socket to overlap, the effective length that now horizontal throw between the central axis of underframe bearing pin 11 ' and the central axis of vertical oil cylinder 40 ' is telescopic outrigger, if the axial length of socket intersection is L0 ', the effective length of telescopic outrigger is L2 '.

If the length of the length WeiLA’， second stage supporting leg 30 ' of first order supporting leg 20 ' is LB '.

Known by analysis, owing to being limited by the layout of concrete pump truck, when retracted state, the shortest length L1 ' of telescopic outrigger is more short better, and during deployed condition, the more long stability that is more conducive to concrete pump truck of the effective length L2 ' of telescopic outrigger.

According to Fig. 1 and Fig. 2, can list:

L2′=LA′+LB′-2L0′ （1）

In actual applications:

${L0}^{\′}=(\frac{1}{6}~\frac{1}{4}){\mathrm{LB}}^{\′}---\left(2\right)$

Vertically oil cylinder 40 ' supporting role can react on 40 ' onesize bearing force of vertical oil cylinder in Hou， ground, ground, and this bearing force is the application force of vertical oil cylinder 40’Dui second stage supporting leg 30 ', and straight up, establish this application force is T0 ' to direction.

If the application force between the second upper cover plate 31 ' of the first upper cover plate 21’Yu second stage supporting leg 30 ' of first order supporting leg 20 ' is F1 ', directed force F 2 ' between the second lower cover 32 ' of the first lower cover 22’Yu second stage supporting leg 30 ' of first order supporting leg 20 ', is easy to draw by moment and equilibrium equation:

${\mathrm{<figure-callout\; id="1"\; label="F"\; filenames="HDA00003633712800023.png"\; state="\{\{state\}\}">F</figure-callout>}1}^{\&prime;}={T0}^{\&prime;}\&times;\frac{{\mathrm{LB}}^{\&prime;}}{{L0}^{\&prime;}}---\left(3\right)$

${F2}^{\&prime;}={T0}^{\&prime;}(\frac{{\mathrm{LB}}^{\&prime;}}{{L0}^{\&prime;}}-1)---\left(4\right)$

Known according to above-mentioned set of equations, F1 ' > F2 '.Now F1 ' is analyzed:

From equation (3), can find out F1 ' and the inversely proportional relation of L0 ', work as L0 ' less, F1 ' is larger, so, if reduce L0 ', increase effective length L2 ', in existing structure, can correspondingly cause F1 ' to increase, if F1 ' is excessive, the intensity of current material often can not meet mechanics requirement.

In sum, between the supporting legs at different levels that the socket mode of existing telescopic outrigger requires to trail, needing has longer socket intersection could meet requirement of strength, thereby has reduced the effective length of telescopic outrigger.The production of continually developing along with current long arm rack concrete pump truck, in the situation that the withdrawal space of telescopic outrigger is restricted again, if can improve the effective length after telescopic outrigger stretches, that will play huge impetus to the development of more long-armed to concrete pump truck.

Utility model content

The utility model aims to provide a kind of telescopic outrigger and has its concrete pump truck, can, in the situation that not lengthening original two-stage supporting leg, extend two-stage supporting leg and stretch the effective length after putting in place.

To achieve these goals, according to Yi Ge of the present utility model aspect, provide a kind of telescopic outrigger, having comprised: first order supporting leg, has comprised the first upper cover plate and the first lower cover; And second stage supporting leg, telescopically is embedded at first order supporting leg Nei， second stage supporting leg and comprises the second upper cover plate and the second lower cover; The first upper cover plate is provided with Locking Device; The end of the first lower cover has the upper convex portion to upper process; The first order supporting leg Nei end that is positioned at of the second lower cover has the lower protuberance to lower process; Second stage supporting leg stretches out first order supporting leg and stretches while putting in place, and the second upper cover plate is positioned at first order supporting leg Nei end and Locking Device butt, upper convex portion and lower protuberance butt.

Further, the first upper cover plate has vertical core; Locking Device comprises locking pin, and locking pin arranges movingly along vertical core; Second stage supporting leg stretches while putting in place, locking pin by vertical core, stretch in first order supporting leg and with the inner end surface butt of the second upper cover plate.

Further, Locking Device also comprises mount pad, and mount pad is fixed on the first upper cover plate, and locking pin is arranged on mount pad.

Further, upper convex portion integrally formed setting on the first lower cover.

Further, lower protuberance integrally formed setting on the second lower cover.

Further, telescopic outrigger also comprises horizontal drive oil cylinder, and one end of horizontal drive oil cylinder is connected with the lateral surface of first order supporting leg, and the other end of horizontal drive oil cylinder is connected with the lateral surface of second stage supporting leg.

Further, telescopic outrigger also comprises vertical oil cylinder, and the cylinder barrel of vertical oil cylinder is arranged on the supporting leg of the second stage and cylinder mouth arranges towards ground.

According on the other hand of the present utility model, a kind of concrete pump truck is provided, comprise telescopic outrigger, telescopic outrigger is aforesaid telescopic outrigger.

Application the technical solution of the utility model, improved the socket mode between the two-stage supporting leg of telescopic outrigger, make telescopic outrigger when stretching, extension puts in place, between the upper cover plate of the upper cover plate of first order supporting leg and second stage supporting leg, by Locking Device, be located by connecting, and second stage supporting leg is positioned at inner end surface and the Locking Device butt of first order supporting leg, between the lower cover of the lower cover of first order supporting leg and second stage supporting leg, by concavo-convex location, coordinate, and the lower protuberance butt of the upper convex portion of first order supporting leg and second stage supporting leg, this connection mode, can by original vertical direction, change the force direction that is subject between first order supporting leg and second stage supporting leg into state that horizontal direction is master, make the length of stressed size between first order supporting leg and the second stage supporting leg intersection as far as possible and between first order supporting leg and second stage supporting leg irrelevant, so just can reduce the length of intersection and can not increase greatly stressed between first order supporting leg and second stage supporting leg, and then make second stage supporting leg can further stretch out first order supporting leg, can be in the situation that keeping first order supporting leg and the original length of second stage supporting leg constant, increase the effective length of telescopic outrigger under extended configuration, support better concrete pump truck, can not increase again telescopic outrigger shared space under recovery state simultaneously

Accompanying drawing explanation

The Figure of description that forms the application's a part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:

Fig. 1 shows the schematic diagram under contraction state according to the telescopic outrigger of prior art;

Fig. 2 shows the schematic diagram under extended configuration according to the telescopic outrigger of prior art;

Fig. 3 shows the schematic diagram under contraction state according to the telescopic outrigger of embodiment of the present utility model;

Fig. 4 shows the A place enlarged drawing according to Fig. 3;

Fig. 5 shows the schematic diagram under extended configuration according to the telescopic outrigger of embodiment of the present utility model;

Fig. 6 shows the B place enlarged drawing according to Fig. 5;

Fig. 7 shows the C place enlarged drawing according to Fig. 5;

Fig. 8 shows according to the schematic diagram of the upper convex portion of the first order supporting leg of embodiment of the present utility model;

Fig. 9 shows according to the schematic diagram of the lower protuberance of the second stage supporting leg of embodiment of the present utility model;

Figure 10 shows according to the schematic diagram of the second stage supporting leg of embodiment of the present utility model;

Figure 11 shows according to the mechanical model figure of the second stage supporting leg of embodiment of the present utility model;

Figure 12 shows according to the telescopic outrigger of embodiment of the present utility model the force analysis schematic diagram under extended configuration;

Figure 13 shows the D place enlarged drawing according to Figure 12; And

Figure 14 shows the E place enlarged drawing according to Figure 12.

The specific embodiment

Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.

As shown in Fig. 3 to Fig. 9, according to embodiment of the present utility model, a kind of telescopic outrigger is provided, comprise first order supporting leg 20 and second stage supporting leg 30, wherein first order supporting leg 20 is hinged on landing leg underframe 10 by underframe bearing pin 11, first order supporting leg 20 is set in outside second stage supporting leg 30, second stage supporting leg 30 can be in the interior motion of first order supporting leg 20, stretch out or retraction first order supporting leg 20, the fore and aft motion of second stage supporting leg 30 is realized by horizontal drive oil cylinder 50, horizontal drive oil cylinder 50 one end is connected on the lateral surface of first order supporting leg 20, the other end of horizontal drive oil cylinder 50 is connected on the lateral surface of second stage supporting leg 30, piston rod movement by horizontal drive oil cylinder 50 drives second stage supporting leg 30 to do fore and aft motion in first order supporting leg 20, second stage supporting leg 30 is connected with vertical oil cylinder 40, vertically the cylinder barrel 42 of oil cylinder 40 be connected on second stage supporting leg 30 and cylinder mouth towards ground, in conjunction with referring to Fig. 3, when second stage supporting leg 30 retraction first order supporting legs 20 and shrink while putting in place, vertically in the piston rod 41 retraction cylinder barrels 42 of oil cylinder 40, reduce telescopic outrigger overall volume, in conjunction with referring to Fig. 5, when second stage supporting leg 30 stretches out first order supporting leg 20 and stretches while putting in place, vertically the piston rod 41 of oil cylinder 40 stretches out downwards and supports on the ground, give the support that concrete pump truck is firm.

First order supporting leg 20He second stage supporting leg 30 is all body structure, wherein first order supporting leg 20 comprises the first upper cover plate 21 and the first lower cover 22 being oppositely arranged up and down, second stage supporting leg 30 comprises the second upper cover plate 31 and the second lower cover 32 being oppositely arranged up and down, on the first upper cover plate 21, be provided with Locking Device 60, at the first lower cover 22, away from underframe bearing pin 11 end, there is the upper convex portion 23 to upper process, at the second lower cover 32, be positioned at first order supporting leg 20Nei end and there is outstanding lower protuberance 33 downwards.When second stage supporting leg 30 stretches out first order supporting leg 20 and stretches while putting in place, a part for second stage supporting leg 30 is stretched out first order supporting leg 20, another part is arranged in first order supporting leg 20, be that second stage supporting leg 30 overlaps with 20 some socket of first order supporting leg, after supporting leg 30 stretching, extensions in the second stage put in place, the second upper cover plate 31 is positioned at first order supporting leg 20Nei end and Locking Device 60 butts, by Locking Device 60 lockings, locate, between the lower protuberance 33 of the upper convex portion 23 of the first lower cover 22 and the second lower cover 32, form the location structure that hook coordinates, upper convex portion 23 and lower protuberance 33 butts.

Owing to having set up locking structure on the first upper cover plate 21, on the first lower cover 22, set up upper convex portion 23 and set up time protuberance 33 on the second lower cover 32, after supporting leg 30 stretching, extensions in the second stage put in place, between first order supporting leg 20Yu second stage supporting leg 30 to be subject to force direction to change into horizontal direction be main, second stage supporting leg 30 and the socket intersection of first order supporting leg 20 can correspondingly be reduced, like this, in the situation that not increasing first order supporting leg 20Yu second stage supporting leg 30 length, can make second stage supporting leg 30 further stretch out first order supporting leg 20, thereby increased considerably the effective length of telescopic outrigger.

Defect of the prior art is, between first order supporting leg 20Yu second stage supporting leg 30, be not similar to this backstop location structure of upper convex portion and lower protuberance, the force direction that is subject between first order supporting leg 20Yu second stage supporting leg 30 is vertical direction, now this stressed size length that overlaps with the socket of second stage supporting leg 30 and first order supporting leg 20 is inversely proportional to, if increase the effective length of telescopic outrigger by reducing coincidence length, will inevitably increase stressed between first order supporting leg 20Yu second stage supporting leg 30, and the strength of material of first order supporting leg 20Yu second stage supporting leg 30 is while being not enough to meet force request, first order supporting leg 20Yu second stage supporting leg 30 is easy to damage, affect the performance of telescopic outrigger.So prior art is not suitable for increasing by reducing coincidence length the effective length of telescopic outrigger.And the utility model has overcome defect of the prior art, can increase the effective length of telescopic outrigger by reducing second stage supporting leg 30 length that overlaps with the socket of first order supporting leg 20, obtained good technique effect.

In conjunction with referring to Fig. 4 and Fig. 6, preferably, Locking Device 60 comprises locking pin 61 and mount pad 62, mount pad 62 is fixed on the lateral surface of the first upper cover plate 21, locking pin 61 telescopicallies are arranged on mount pad 62, the first upper cover plate 21 has vertical core away from underframe bearing pin 11 end, locking pin 61 is located in vertical core, when second stage supporting leg 30 is during to the interior contraction of first order supporting leg 20, locking pin 61 is retracted in vertical core, Bu Huiyu second stage supporting leg 30 interferes, when second stage supporting leg 30 stretches out first order supporting leg 20 and stretches while putting in place, locking pin 61 moves and stretches out vertical core along vertical core, thereby the inner end surface butt with the second upper cover plate 31.

The expanding-contracting action of locking pin 61 can be realized by electromagnetic control.

In conjunction with referring to Fig. 7 to Fig. 9, preferably, upper convex portion 23 is integrally formed on the first lower cover 22, and lower protuberance 33 is integrally formed on the second lower cover 32, and this forming technology is simple and cheap.

Certainly, upper convex portion 23 can be to be also removably connected on the first lower cover 22, and lower protuberance 33 can be to be also removably connected on the second lower cover 32, and the advantage of this connection mode is more flexible, and comformability is stronger.

When concrete pump truck is worked, the motion process of the telescopic outrigger of the present embodiment is:

Under the driving of horizontal drive oil cylinder 50, second stage supporting leg 30 stretches out from first order supporting leg 20, when protuberance 33 is encountered upper convex portion 23 instantly, second stage supporting leg 30 stops extend action, and second stage supporting leg 30 stretches and puts in place, simultaneously, locking pin 61 stretch out vertical core and with the inner end surface butt of the second upper cover plate 31, then, vertically the piston rod 41 of oil cylinder 40 stretches out cylinder barrel 42 and acts on ground under the promotion of hydraulic oil, and the motion of telescopic outrigger completes.

In conjunction with referring to Figure 10 to Figure 14, the technical solution of the utility model is carried out to mechanical analysis below:

If the length of the length WeiLA， second stage supporting leg 30 of first order supporting leg 20 is LB.

After second stage supporting leg 30 retraction first order supporting legs 20 contraction put in place, the shortest length that the horizontal throw between the central axis of the central axis of underframe bearing pin 11 and vertically oil cylinder 40 is telescopic outrigger, the shortest length of establishing telescopic outrigger is L1.

After second stage supporting leg 30 stretches out first order supporting leg 20 and stretches and put in place, first order supporting leg 20Yu second stage supporting leg 30 has part socket to overlap, the effective length that now horizontal throw between the central axis of underframe bearing pin 11 and the central axis of vertical oil cylinder 40 is telescopic outrigger, if the axial length of socket intersection is L0, the effective length of telescopic outrigger is L2.

In order more clearly to contrast the quality of the technical scheme that the technical solution of the utility model and background technology mention, establish L1=L1 ', L2=L2 ', LA=LA ', LB=LB '.

Owing to being limited by the layout of concrete pump truck, when retracted state, the shortest length L1 of telescopic outrigger is more short better, and during deployed condition, the more long stability that is more conducive to concrete pump truck of the effective length L2 of telescopic outrigger.

As can be seen from Figure 12:

L2=LA+LB-2L0 （5）

For the utility model, it is very little that L0 can do with respect to LA and LB, that is to say L0 → 0.

Suppose L0 → 0 (6)

So equation (4) can be similar to and be rewritten as:

L2=LA+LB （7）

Known in conjunction with the equation in background technology (1) and (2):

$L2=\mathrm{LA}+\mathrm{LB}={L2}^{\&prime;}+2{L0}^{\&prime;}={L2}^{\&prime;}+2(\frac{1}{6}~\frac{1}{4})\mathrm{LB}---\left(8\right)$

From equation (8), can find out, in the situation that the length L A of the first order supporting leg 20 of telescopic outrigger is, the length L B of second stage supporting leg 30 and shortest length L0 are all constant, the effective length L2 of telescopic outrigger of the present utility model is far longer than the effective length L2 ' of the telescopic outrigger of prior art.

That for hypothesis L0 → 0, sets up is discussed below:

When piston rod 41 supporting roles of vertical oil cylinder 40 are during in ground, ground can react on 40 1 bearing forces of vertical oil cylinder, this bearing force is identical with the application force of vertical oil cylinder 40Dui second stage supporting leg 30, direction straight up, if this application force is T0, as follows in conjunction with second stage supporting leg 30 being set up to mechanical model figure referring to Figure 11:

Take the supporting leg 30 lower left corner, the second stage in Figure 11 is an a, take the central axis of vertical oil cylinder 40 and the intersection point of the second lower cover 32 is a b, take the second upper cover plate 31, the first upper cover plate 21 and locking pin 61 intersection is a c, such 3 mechanical model figure that set up Yi Ge second stage supporting leg 30.

An a of take analyzes as initial point, and the power T0 at some b place can produce a moment M1 of ordering with respect to a, and size is:

M1=T0×LB （9）

Due to moment balance, at some c place, can produce a counter torque M2, and M2=M1, so the horizontal force F3 direction that acts on a c place is to the right, and:

$F3=\frac{M2}{H}=\frac{T0\&times;\mathrm{LB}}{H}---\left(10\right)$

Wherein H is the distance between the lateral surface of the second upper cover plate 31 and the lateral surface of the second lower cover 32.

F3 is the counter-force that locking pin 61 acts on second stage supporting leg 30.

Due to equilibrium of forces, at a c place, also can produce a counter-force T, direction is downward, and size equates with the power that vertical oil cylinder 40 acts on second stage supporting leg 30,

T=T0 （11）

T is the counter-force that the first upper cover plate 21 acts on the second upper cover plate 31.

According to equilibrium of forces, 23 pairs of lower protuberances 33 of upper convex portion also act on level power F4 left:

$F4=F3=\frac{T0\&times;\mathrm{LB}}{H}---\left(12\right)$

Application force combination between second stage supporting leg 30, first order supporting leg 20 and locking pin 61 is referring to shown in Figure 12 to Figure 14.

From equation (10), (11), (12), can find out, directed force F 3, F4 and the T between second stage supporting leg 30 and first order supporting leg 20 and locking pin 61 is the amount irrelevant with L0, so set up L0 → 0.

From above analysis, can draw to draw a conclusion:

In the situation that the length L A of the first order supporting leg 20 of telescopic outrigger is, the length L B of second stage supporting leg 30 and shortest length L0 are all constant, the expansion effective length L2 of telescopic outrigger of the present utility model is maximum, L2=LA+LB, effective length can approximate the length sum of first order supporting leg 20He second stage supporting leg 30.

It is example that the present embodiment be take the telescopic outrigger with two-stage supporting leg, principle of the present utility model and structure be have been described in detail, but the technical solution of the utility model is not limited to be applied in the telescopic outrigger with two-stage supporting leg, there is two-stage and also can adopt the technical solution of the utility model with the telescopic outrigger of upper supporting leg.

For thering is the telescopic outrigger of two-stage with upper supporting leg, arbitrarily in connected two-stage supporting leg, using a cover supporting leg outside as aforesaid first order supporting leg, to be positioned at an inner supporting leg as aforesaid second stage supporting leg, now, the effective length of telescopic outrigger equals the length sum of supporting legs at different levels.

The utility model also provides a kind of concrete pump truck, comprises telescopic outrigger, and this telescopic outrigger is aforesaid telescopic outrigger.

As can be seen from the above description, the utility model the above embodiments have realized following technique effect:

1, can increase by the socket coincidence length between minimizing two-stage supporting leg the effective length of telescopic outrigger;

2, effectively improve the stability of concrete pump truck.

The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims (8)

1. a telescopic outrigger, comprising:

First order supporting leg (20), comprises the first upper cover plate (21) and the first lower cover (22); And

Second stage supporting leg (30), telescopically is embedded in described first order supporting leg (20), and described second stage supporting leg (30) comprises the second upper cover plate (31) and the second lower cover (32);

It is characterized in that, described the first upper cover plate (21) is provided with Locking Device (60);

The end of described the first lower cover (22) has the upper convex portion (23) to upper process;

Described first order supporting leg (20) the Nei end that is positioned at of described the second lower cover (32) has the lower protuberance (33) to lower process;

Described second stage supporting leg (30) stretches out described first order supporting leg (20) and stretches while putting in place, described the second upper cover plate (31) is positioned at described first order supporting leg (20) Nei end and described Locking Device (60) butt, described upper convex portion (23) and described lower protuberance (33) butt.

2. telescopic outrigger according to claim 1, is characterized in that,

Described the first upper cover plate (21) has vertical core;

Described Locking Device (60) comprises locking pin (61), and described locking pin (61) arranges movingly along described vertical core;

When described second stage supporting leg (30) stretches and to put in place, described locking pin (61) by described vertical core, stretch in described first order supporting leg (20) and with the described inner end surface butt of described the second upper cover plate (31).

3. telescopic outrigger according to claim 2, it is characterized in that, described Locking Device (60) also comprises mount pad (62), and it is upper that described mount pad (62) is fixed on described the first upper cover plate (21), and described locking pin (61) is arranged on described mount pad (62).

4. telescopic outrigger according to claim 1, is characterized in that, described upper convex portion (23) is in the upper integrally formed setting of described the first lower cover (22).

5. telescopic outrigger according to claim 1, is characterized in that, described lower protuberance (33) is in the upper integrally formed setting of described the second lower cover (32).

6. according to the telescopic outrigger described in any one in claim 1 to 5, it is characterized in that, described telescopic outrigger also comprises horizontal drive oil cylinder (50), one end of described horizontal drive oil cylinder (50) is connected with the lateral surface of described first order supporting leg (20), and the other end of described horizontal drive oil cylinder (50) is connected with the lateral surface of described second stage supporting leg (30).

7. according to the telescopic outrigger described in any one in claim 1 to 5, it is characterized in that, described telescopic outrigger also comprises vertical oil cylinder (40), and the cylinder barrel (42) of described vertical oil cylinder (40) is arranged at described second stage supporting leg (30) above and cylinder mouth arranges towards ground.

8. a concrete pump truck, comprises telescopic outrigger, it is characterized in that, described telescopic outrigger is the telescopic outrigger described in any one in claim 1 to 7.

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