WO2014029154A1

WO2014029154A1 - Engineering machinery, main arm thereof, and method for detecting and correcting side bending of main arm

Info

Publication number: WO2014029154A1
Application number: PCT/CN2012/082114
Authority: WO
Inventors: 詹纯新; 刘权; 汤美林; 张建军; 罗贤智; 李义
Original assignee: 中联重科股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2012-08-24
Filing date: 2012-09-27
Publication date: 2014-02-27
Also published as: CN102795560B; CN102795560A

Abstract

Disclosed are engineering machinery, a main arm thereof, a method for detecting side bending of the engineering machinery main arm, and a method for correcting the side bending of the engineering machinery main arm. The engineering machinery main arm comprises a main body (10) and a bearing mechanism (20) provided at two sides of the main body (10). The bearing mechanism (20) comprises a mounting portion (21) connected to the main body (10), and a telescopic bearing portion, with one end of the bearing portion being connected to the head of the main body (10) and the other end being connected to the mounting portion (21). The engineering machinery main arm further comprises a detecting unit for detecting length information of the bearing portion and a controller for controlling the extension or retraction of the bearing portion. The engineering machinery main arm can use the telescopic bearing portion to support the main body thereof, such that the detection and the correction of the side bending of the main arm can be achieved.

Description

Construction machinery and its main arm, method for detecting and correcting the bending of its main arm

The present invention relates to a construction machinery main arm, and in particular to a construction machine and its main arm, a method of detecting and correcting the bending of the main arm of the engineering machine. Background technique

With the development of wind power, nuclear power, chemical and other industries, parts and components are increasingly modularized and large-sized, and the demand for large-tonnage cranes is increasing. There is a need to increase the lifting height and lifting load of the crane, so the telescopic crane is moving in the direction of large-scale. However, the longer the crane boom and the higher the lifting load, the more likely it is that the side bend phenomenon will occur, which will affect the lifting performance of the whole vehicle, and the accident that the folding arm will be broken or even the machine will be destroyed. Therefore, detecting the side camber of the crane boom and correcting the side bend of the crane boom are of great significance for ensuring the lifting performance and lifting safety of the whole vehicle.

At present, the side bend of the crane boom is detected by the naked eye. When the actual centerline of the boom is observed to deviate from the theoretical centerline of the boom, the boom is considered to be a side bend. However, this can only be judged whether or not a side bend occurs, and the side bend (i.e., the distance of the actual center line from the theoretical center line at the head of the boom) cannot be detected. Therefore, when observing the side bend of the boom, the boom should be lowered to a lower position from the ground, and then the internal slider of the boom should be manually adjusted to correct the boom bend. Since the side camber cannot be detected, it is sometimes necessary to repeat the observation, the reverse arm, and the adjustment of the slider.

Therefore, in the prior art, there is a method in which it is impossible to detect the side camber of the crane boom and to easily and effectively correct the side bend. Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a construction machine main arm that facilitates the detection and correction of side bends of the main arm of an engineering machine.

In order to achieve the above object, the present invention provides a construction machinery main arm, the construction machinery main arm The main body of the construction machine further includes a support mechanism disposed on two sides of the main body, the support mechanism includes a mounting portion connected to the main body and a telescopic support portion, one end of the support portion It is connected to the head of the main body, and the other end is connected to the mounting portion.

The present invention also provides a construction machine, wherein the construction machine comprises the construction machine main arm of the present invention.

The present invention also provides a method for detecting a camber of a main arm of a construction machine, wherein the main arm of the construction machine is the main arm of the construction machine of the present invention, wherein the support portion includes a first support portion and a second support portion. The mounting portion includes a first mounting portion for mounting the first support portion and a second mounting portion for mounting the second support portion, the first mounting portion and the second mounting portion and the body The distance from the joint to the joint of the corresponding support and the head of the body is

L ₃ , the first mounting portion and the second mounting portion respectively have a first angle and a second angle with a theoretical center line of the main arm, and the method includes: when the engineering machine main arm has a side bend Extending or contracting the support portions on both sides to support the main body from both sides; measuring the connection between the first support portion and the head portion of the main body to the first support portion farthest from the main body a distance H between the second support portion and the head of the body to a distance H ₂ between the second support portion and the farthest from the body, measuring the distance from the body on the first support portion a distance H ₃ from the farthest point to the junction of the first mounting portion and the body, measuring the connection of the second support portion farthest from the body to the second mounting portion and the body The distance between the points H _{4 ;} calculate the side curvature:

H ₄ sin a - H ₃ sin β ₂ ² H ₄ ² cos ² a 2H ₄ L ₃ cos ² a L ₃ ²

L. = 2 ― ~~ 2 .

H - H ₃ ² cos ² β + 2H ₃ L ₃ cos ² β - L ₃ ²

2

The present invention also provides a method for correcting the side bend of a main arm of an engineering machine, wherein the main arm of the construction machine is the main arm of the construction machine of the present invention, and the support portion includes a first support portion and a second support portion, the method The method includes: when the main arm of the construction machine is bent, extending or contracting the support portions on both sides to support the main body from both sides; measuring the connection between the first support portion and the head of the main body to the Measuring the distance H between the first support portion and the farthest point from the body, measuring the second support portion a distance H ₂ from the connection of the head of the body to the second support portion farthest from the body _;

When the body is bent toward the side where the second support portion is located, the following operations are performed:

(a), when the first predetermined value a1, or when H ₂ <the second predetermined value a2, shrinks the first support portion, and elongates the second support portion, and measures H _{2 in} real time Until a third predetermined value a3 a first predetermined value a1 and a second predetermined value a2 H _{2 a} fourth predetermined value a4;

(b), when the third preset value &3 the first predetermined value a1 and the second preset value a2 H _{2 the} fourth predetermined value a4, terminating the correction;

When the main body is bent toward the side where the first support portion is located, the following operations are performed: (c), when <the third preset value a3, or when H ₂ > the fourth preset value a4, shrink The second support portion elongates the first support portion and measures H _{2 in} real time until a third predetermined value a3 is a first predetermined value a1 and a second predetermined value a2 H _{2 is a} fourth predetermined value a4 (d), when the third preset value &3 the first predetermined value a1 and the second preset value a2 H _{2 the} fourth predetermined value a4, the correction is terminated.

According to the above technical solution, when the main body is subjected to the side bend, the main body can be supported by the retractable support portion, and the side camber can be detected and the side bend can be corrected.

Other features and advantages of the invention will be described in detail in the detailed description which follows. DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are in the In the drawing:

1 is a schematic view showing an embodiment of a construction machine main arm of the present invention; FIG. 2 is a schematic view showing a method of detecting a construction machine main arm of the present invention;

3 is a schematic view illustrating a method of detecting a main arm of a construction machine in a preferred embodiment of the present invention; Figure

4 is a schematic structural view illustrating an embodiment of a mounting portion;

Figure 5 is a schematic view showing the structure of another embodiment of the mounting portion;

6 is a schematic view showing another embodiment of the construction machine main arm of the present invention; and FIG. 7 is a flow chart showing a method of correcting the construction machine main arm of the present invention. Description of the reference numerals

10: subject

20: Support mechanism 21 : Mounting part 21a: Bracket 21b: Hoist

21c: Pulley 22: First support portion 23: Second support portion

30: Turntable 40: Support

AA: Theoretical Centerline BB: Actual Centerline

L ₀ : side curvature

: the distance from the junction of the first support to the body to the theoretical centerline

L ₂ : distance from the junction of the first support portion and the main body to the theoretical center line

L ₃ : distance from the connection of the mounting portion to the main body to the joint of the support portion and the head of the main body

H _{1 :} the distance between the connection of the first support and the head of the main body to the farthest distance from the main body on the first support portion

3⁄4: the distance between the connection of the second support and the head of the main body to the farthest distance from the main body on the second support portion

3⁄4: the distance from the farthest portion of the first support portion to the junction of the first mounting portion and the main body

H ₄ : a distance from the farthest portion of the second support portion to the junction of the second mounting portion and the main body detailed description

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are intended to be illustrative and not restrictive.

In the present invention, the orientation words such as "up, down, left, and right" as used herein generally refer to the upper, lower, left, and right as shown in the accompanying drawings; "inside and outside". It refers to the inside and outside of the contour of each component itself. Here, "support" means that the support, the tension, and the like serve to maintain the position of the main body.

According to an aspect of the present invention, a construction machine main arm is provided, the construction machine main arm including a main body 10, wherein the construction machine main arm further includes a support mechanism 20 symmetrically disposed on both sides of the main body 10, The support mechanism 20 includes a mounting portion 21 connected to the main body 10 and a telescopic support portion. One end of the support portion is connected to the head of the main body 10, and the other end is connected to the mounting portion 21.

In the main arm of the construction machine of the present invention, the main body 10 is provided with telescopic support portions on both sides thereof. When the main body 10 is bent, it can be corrected by the corresponding telescopic support portions, which will be described in the lower stationery. In addition, when the main body 10 is subjected to a side bend, on the one hand, the support portions on both sides can be extended and contracted to support the main body 10 in the side bend state, and on the other hand, the side bend can be obtained by detecting the expansion and contraction data of the support portion, which will be specifically described below. Description. To this end, the construction machine main arm preferably includes a detecting unit for detecting length information of the support portion and a controller for controlling expansion and contraction of the support portion, and the controller is electrically connected to the detecting unit.

In the present invention, the mounting portion 21 can adopt various appropriate configurations as long as the main body 10 and the support portion can be connected. The support portion can also take various suitable forms as long as it can telescope and provide support for the main body 10. Preferably, as shown in FIG. 4, the mounting portion 21 may include a bracket 21a and a reversible hoisting 21b mounted on the bracket 21a, the bracket 21a being mounted on the main body 10, The support portion is a wire rope that is accommodated by the hoisting 21b. Thereby, the main body 10 can be supported by tensioning the wire rope. Alternatively, the support portion may include a telescopic cylinder, and both ends of the telescopic cylinder are respectively coupled to the main body 10 and the bracket 21a, so that the main body 10 can be supported by the telescopic cylinder.

In addition, the extending direction of the bracket 21a may be perpendicular to the extending direction of the main body 10, so that the connection between the bracket 21a and the main body 10, the joint of the bracket 21a and the supporting portion, and the joint of the supporting portion with the main body 10 can be made. A right triangle is formed so that the main body 10 obtains a stable support through the support portion. Preferably, the bracket 21a can be coupled to the root of the body 10 so that a maximum moment can be applied to the body 10 through the support.

In the embodiment in which the wire rope is used as the support portion, preferably, the bracket 21a may be mounted with a pulley 21c, and the wire rope is connected to the hoisting 21b around the pulley 21c to change the direction of the wire rope through the pulley 21c. Easy to arrange. As shown in Fig. 5, the hoisting 21b can be close to the inner end of the bracket 21a, and the pulley 21c can be close to the outer end of the bracket 21a, that is, the hoisting 21b is closer to the main body 10 than the pulley 21c, but the connection of the wire rope to the mounting portion 21 It can be extended to the pulley 21c.

According to another aspect of the present invention, a construction machine is provided, wherein the construction machine includes the construction machine main arm of the present invention. The construction machine of the present invention can detect the side camber by the telescopic support portion and provide correction for the side bend.

Further, as shown in Fig. 6, the construction machine includes a turntable 30, and the main body 10 is mounted on the turntable 30, and the mounting portion 21 and the turntable 30 can be connected by a support member 40. Thereby, the main body 10 can obtain bidirectional support through the support portion and the support member 40. Wherein, due to the side bend, the axial deviation mainly occurs at the head of the main body 10. When the mounting portion 21 is disposed near the root of the main body 10, the position of the mounting portion 21 is substantially not axially offset, so the length of the support member 40 can be maintained. It is only necessary to provide support to the mounting portion 21. Therefore, the support member 40 can take various forms such as a wire rope, a telescopic cylinder or a rigid rod.

According to another aspect of the present invention, a method for detecting a camber of a main arm of a construction machine (hereinafter referred to as a detecting method) is provided, wherein the support portion includes a first support portion 22 and a second support portion 23, the mounting Portion 21 includes a first mounting portion for mounting the first support portion 22 and for Mounting a second mounting portion of the second support portion 23, a connection between the first mounting portion and the second mounting portion and the main body 10 to a joint of the corresponding support portion and the head of the main body 10 The distance is both L ₃ , the first mounting portion and the second mounting portion respectively have a first angle β and a second angle α with the theoretical center line AA of the main arm, the method comprising: when the construction machine When the main arm is bent, the support portions on both sides are extended or contracted to support the main body 10 from both sides; the connection between the first support portion 22 and the head of the main body 10 is measured to the first support portion The distance H from the farthest point of the main body 10 on the 22 is measured between the connection of the second support portion 23 and the head of the main body 10 to the farthest distance from the main body 10 on the second support portion 23 a distance H _2, measuring from the first support portion 22 on the body 10 farthest to the first mounting portion and the distance between the connection body 10 H _3, the distance measuring portion 23 of the second support a distance H ₄ from the farthest portion of the main body 10 to the junction of the second mounting portion and the main body 10 _;

Calculate the side curvature:

H ₄ sin a - H ₃ sin β fi ₂ ² H ₄ ² cos ² a 2H ₄ L ₃ cos ² a L ₃ ²

L. = 2 ― ~~ 2

H - H ₃ ² cos ² β + 2H ₃ L ₃ cos ² β - L ₃ ²

2

The above detection method will be described below with the support portion being a wire rope. As shown in Fig. 2, the mounting portion 21 is attached to the root portion of the main body 10, so that 1^ _{3 is} the length of the main body 10; and _{3⁄4 is} the length of the wire rope pulled from the mounting portion 21, respectively, which is tensioned on both sides. Wherein, the side curvature (ie, the distance of the actual center line BB from the theoretical center line AA at the head of the body 10) 1^—^^ = ^^. Further, the length of the first mounting portion is Η ₃ , and the length of the second mounting portion is Η ₄ . A imaginary straight line parallel to the theoretical centerline can be made from the junction of the wire ropes on both sides with the body 10. Taking the second mounting portion as an example, the distance between the intersection of the straight line and the second mounting portion to the extended end of the second mounting portion is X, and the connection between the first supporting portion 22 and the main body 10 to the intersection The distance is Lx. Among them: According to the geometric relationship, we can get a quadratic equation with L ₂ as the unknown:

- 2H ₄ sin a - L ₂ + (H ₄ ² - H ₂ ² - 2H ₄ L^ cos ² a + L^) - 0 After solving this equation, we get:

L ₂ = H ₄ sin a +

H _A sin a H _A cos a + 2H _A L, cos α-L·

Both are positive values, and the value of ^sina is actually greater than L ₂ . Based on this judgment, the formula for obtaining L ₂ is actually:

/ 2 2 9 "7 2

L ₂ = Η ₄ ύηα H ₂ — H ₄ cos a + 2H cos aL

As with the above calculation process, you can find:

= H ₃ sin β - H - H ₃ ² cos ² + 2H ₃ L ₃ cos ² β - L ₃ ²

Therefore, according to the calculation formula of the bend, you can get:

One A

H ₄ sin « - ^H ₂ ² - H ₄ ² cos ² a + 2H ₄ L, cos ² « - L, ² 1 - fH ₃ sin β - ^H^ - H ₃ ² cos ² β + 2H ₃ cos ² Ι-Ι^

_ H ₄ since -H3 sin y5 ^H^ - H ₄ ² cos ² a - 2H ₄ L, cos ² al^ -y/H - H ₃ ² cos ² β + 2Η ₃ Ι^ cos ² ― 2 2 + 2 Preferably, as shown in FIG. 3, when the two support mechanisms 20 are symmetrically disposed on both sides of the main body 10 (ie, Η ₃ = Η ₄ , the first angle β = the second angle α), and the first angle β and When the second angle ct is 90 degrees,

It can be seen that the side curvature can be calculated only by detecting and Η ₂ (when the mounting portion 21 of a certain size is used, _3⁄4 and Η ₄ are determined values; the first angle β and the second angle α are pre-installation values. Set the parameters). Wherein, the sum can be obtained by various suitable detecting means, for example, by the above detecting unit. Wherein the detection unit may not be directly acquired data and Η _2, but, for example from a length of wire rope hoist the rope 21b, the length may be converted to simple calculation, and ₁₁₂ and the detection result as a detection means. For example, in the case of the pulley 21c Next, and 11 ₂ are the distance between the pulley 21c and the hoist 21b from the length of the rope of the hoisting 21b.

According to another aspect of the present invention, a method for correcting a side bend of a work machine main body is provided, wherein the work machine main arm is the construction machine main arm of the present invention, and the support portion includes a first support portion 22 and a a second support portion 23, the method comprising: extending or contracting support portions on both sides to support the main body 10 from both sides when the construction machinery main arm is subjected to a side bend; measuring the first support portion 22 and the a distance H between the joint of the head of the body 10 to the farthest portion of the first support portion 22 from the body 10, the connection of the second support portion 23 to the head of the body 10 to the second a distance H ₂ between the support portion 23 and the farthest from the main body 10 _;

When the main body 10 is bent toward the side where the second support portion 23 is located (i.e., the first support portion 22 is elongated and the second support portion 23 is shortened), the following operations are performed:

(a), when the first predetermined value a1, or when H ₂ <the second predetermined value a2, shrinks the first support portion 22, and elongates the second support portion 23, and measures the sum in real time H ₂ , up to a third preset value &3 first predetermined value al and a second preset value a2 H ₂ fourth predetermined value a4 _;

(b) when the third predetermined value a3 is the first predetermined value a1 and the second predetermined value a2 H _{2 is the} fourth predetermined value a4, the correction is terminated;

When the main body 10 is bent toward the side where the first support portion 22 is located (i.e., the second support portion 23 is elongated and the first support portion 22 is shortened), the following operations are performed:

(c), when <the third preset value a3, or when H ₂ > the fourth preset value a4, contracting the second support portion 23 and elongating the first support portion 22, and measuring in real time And H ₂ up to a third predetermined value a3 a first predetermined value a1 and a second predetermined value a2 H _{2 a} fourth predetermined value a4;

(d), when the third preset value a3 is the first predetermined value a1 and the second preset value a2 H _{2 is the} fourth predetermined value a4, the correction is terminated.

Similarly, the above detection method is described by using the support portion as a wire rope, wherein the main body can be The range of the first support portion 22 and the second support portion 23 is set in advance by the length 1 of _{3 of} 10. Specifically, when the main body 10 does not have a side bend, the two side wire ropes should be equal to the H ₂ when the wire rope is tightened; when the side bend occurs and the wire rope is tightened, the third preset value a3 is allowed to the first preset value a1. Between H _{2 is} allowed to be between the second preset value a2 and the fourth preset value a4. That is to say, when both H ₂ and H ₂ are within the corresponding range, no correction can be made. The third preset value a3 is smaller than the first preset value a1, and the second preset value a2 is smaller than the fourth preset value a4.

Wherein the signal is determined, in the embodiment with the detection unit and a controller, the controller can be issued in accordance with the detecting unit ₁₁₂ and controls the first and respective second support portion 22 and the support portion 23 to be corrected. Wherein, when the controller one control hoisting 21b contracts the corresponding support portion, the other hoisting 21b can be caused to release the other side of the wire rope, that is, to elongate the other support portion.

As shown in Fig. 7, when a side bend occurs, the wire rope is first tensioned to support the main body 10 through the first support portion 22 and the second support portion 23. Then, the direction of the side bend is judged, i.e., whether the first support portion 22 and the second support portion 23 are elongated or shortened.

When the main body 10 is bent toward the side where the second supporting portion 23 is located, it is further determined whether the sum is beyond the respective range, that is, whether it is greater than the upper limit (ie, the first preset value a1), or whether It is less than its lower limit (ie, the second preset value a2). When at least one of the sum and the 3⁄4 is out of range, correction is required. The correction is to contract the first support portion 22 and extend the second support portion 23. In this process, the controller monitors the change of 11 ₂ in real time through the detecting unit, and stops the correction when the sum 11 ₂ falls within its range.

Similarly, when the main body 10 is bent toward the side where the first support portion 22 is located, it is further determined whether the H ₂ is beyond the respective range, that is, whether it is less than the lower limit thereof (ie, the third preset value a3). , or 3⁄4 is greater than its upper limit (ie the fourth preset value a4). When at least one of and 3⁄4 is out of range, correction is required. The correction is to contract the second support portion 23 and elongate the first support portion 22. During this process, the controller monitors the change in real time through the detection unit, and stops the correction when the sum falls into its range.

Preferably, the two support mechanisms 20 are symmetrically disposed on both sides of the main body 10, and The mounting portion 21 is disposed perpendicular to the length direction of the main body 10. The length of the main body 10 may be 50-110 m, the first predetermined value a1 is 51-99 m, and the second predetermined value a2 is 54- 104m, the third predetermined value a3 is 51-99m, and the fourth predetermined value a4 is 54-104m.

It will be understood that the first support portion 22 and the second support portion 23 are tensioned or relaxed by the main body 10, and the hoisting 21b is always in a state of being taken up. Therefore, it is necessary to overcome the pulling force of the hoisting 21b to take up the rope when the main body 10 is bent, so that the corresponding support portion becomes long. In the case where the telescopic cylinder is used as the support portion, it is necessary to overcome the pressure in the telescopic cylinder when the main body 10 is bent, so that the corresponding support portion becomes long, and the length change of the telescopic cylinder is preferably kept within 0.5 m.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments, and various simple modifications of the technical solutions of the present invention may be made within the scope of the technical idea of the present invention. These simple variations are within the scope of the invention.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not be further described in various possible combinations.

In addition, any combination of various embodiments of the invention may be made, as long as it does not deviate from the idea of the invention, and should also be regarded as the disclosure of the invention.

Claims

Rights request

1. A construction machine main arm, comprising: a main body (10), wherein the construction machine main arm further comprises a support mechanism (20) disposed on two sides of the main body (10), The support mechanism (20) includes a mounting portion (21) connected to the main body (10) and a telescopic support portion, one end of the support portion is connected to the head of the main body (10), and the other end is connected to The mounting portion (21).

2. The construction machine main arm according to claim 1, wherein the construction machine main arm includes a detection unit for detecting length information of the support portion and a controller for controlling expansion and contraction of the support portion, The controller is electrically connected to the detecting unit.

The construction machine main arm according to claim 1 or 2, wherein the mounting portion (21) comprises a bracket (21a) and a reversible hoist (21b) mounted on the bracket (21a) The bracket (21a) is mounted on the main body (10), and the support portion is a wire rope that is retracted by the hoisting (21b).

4. The construction machine main arm according to claim 3, wherein the bracket (21a) is mounted with a pulley (21c), and the wire rope is connected to the hoist (21b) around the pulley (21c) .

The construction machine main arm according to claim 1 or 2, wherein the mounting portion (21) includes a bracket (21a), the support portion includes a telescopic cylinder, and the bracket (21a) is mounted on the main body (10) Upper ends of the telescopic cylinder are connected to the main body (10) and the bracket (21a), respectively.

6. A construction machine, characterized in that the construction machine comprises a construction machine main arm according to any one of claims 1-5.

The construction machine according to claim 6, wherein the construction machine comprises a turntable (30), the main body (10) is mounted on the turntable (30), the mounting portion (21) and the The turntable (30) is connected by a support (40).

A method for detecting a camber of a main arm of a construction machine, wherein the construction machine main arm is the construction machine main arm according to any one of claims 1 to 5, wherein the support portion includes the first a support portion (22) and a second support portion (23), the mounting portion (21) including a first mounting portion for mounting the first support portion (22) and for mounting the second support portion ( a second mounting portion of the second mounting portion, a distance between the connection of the first mounting portion and the second mounting portion and the main body (10) to a joint of the corresponding supporting portion and the head of the main body (10) For L ₃ , the first mounting portion and the second mounting portion respectively have a first angle (β ) and a second angle ( α ) with a theoretical center line of the main arm, and the method includes:

When the main arm of the construction machine is bent, the support portions on both sides are extended or contracted to support the main body (10) from both sides;

Measuring a distance H between the junction of the first support portion (22) and the head of the body (10) to the farthest portion of the first support portion (22) from the body (10), measuring the second support a portion (23) a distance from the head of the body (10) to a distance H ₂ from the farthest portion of the second support portion (23) from the body (10), measuring the first support portion ( 22) a distance H ₃ from the farthest distance from the main body (10) to the junction of the first mounting portion and the main body (10), measuring the distance from the main body on the second supporting portion (23) (10) the distance H ₄ from the farthest to the junction of the second mounting portion and the body (10) _;

Calculate the side curvature:

L. = 2 ― ~~ 2

Hi ² - H ₃ ² cos ² β + 2H ₃ L ₃ cos ² β - L ₃ ²

A method for correcting a side bend of an engineering machine main body, wherein the construction machine main arm is the construction machine main arm according to any one of claims 1 to 5, and the support portion includes a first support portion (22) and a second support portion (23), the method comprising:

Measuring a distance H between the junction of the first support portion (22) and the head of the body (10) to the farthest portion of the first support portion (22) from the body (10), measuring the second support a distance (H) from the head of the body (10) to the second support portion (23) at a distance H ₂ from the farthest point of the body (10) _;

When the main body (10) is bent toward the side where the second support portion (23) is located, the following operations are performed:

(a), when the first predetermined value (al), or when the second predetermined value (a2), shrinks the first support portion (22), and causes the second support portion (23) Extending, and measuring H _{2 in} real time until a third predetermined value (a3) a first predetermined value (al) and a second predetermined value (a2) H _{2 a} fourth predetermined value (a4);

(b) when the third predetermined value (a3) is the first predetermined value (al) and the second predetermined value (a2) H _{2 is the} fourth predetermined value (a4), the correction is terminated;

When the main body (10) is bent toward the side where the first support portion (22) is located, the following operations are performed:

(c), when <the third preset value (a3), or when > the fourth preset value (a4), contracting the second support portion (23) and causing the first support portion (22) Extending, and measuring H _{2 in} real time until a third predetermined value (a3) a first predetermined value (al) and a second predetermined value (a2) H _{2 a} fourth predetermined value (a4);

(d), when the third preset value (a3) is the first predetermined value (al) and the second preset value (a2) H _{2 is the} fourth predetermined value (a4), the correction is terminated.

10. The method according to claim 9, wherein the two support mechanisms (20) are symmetrically disposed on both sides of the body (10), and the mounting portion (21) is perpendicular to the body (10) The length direction of the body (10) is 50-110 m, the first predetermined value (al ) is 51-99 m, and the second predetermined value (a2) is 54-104 m, the The third predetermined value (a3) is 51-99 m, and the fourth predetermined value (a4) is 54-104 m.