CN213231296U - Telescopic device and engineering machinery - Google Patents

Abstract

The application relates to the technical field of engineering machinery, in particular to a telescopic device and engineering machinery. The telescopic device comprises a moving arm, a fixed arm and a guide mechanism, the guide mechanism is arranged between the moving arm and the fixed arm for realizing telescopic operation, a gap is kept between the moving arm and the fixed arm through a first guide assembly and a second guide assembly, the problem of fitting between the moving arm and the fixed arm can be improved, guide and lubrication operations are performed for telescopic operation of the moving arm, the friction resistance in the telescopic process of the moving arm can be effectively reduced, and the telescopic efficiency is improved. The engineering machinery uses the telescopic device with the guiding function and the friction resistance reducing function, and the efficiency of the engineering machinery using the telescopic device for telescopic operation can be improved.

Description

Telescopic device and engineering machinery

Technical Field

The application relates to the technical field of engineering machinery, in particular to a telescopic device and engineering machinery.

Background

The telescopic device is usually used as a working device on engineering machinery and mainly comprises a plurality of section arms and a telescopic cylinder which are nested with each other, and the section arms slide and stretch relatively under the action of the telescopic cylinder, so that the working range of the working device in the engineering machinery is enlarged, and the safety and stability of the operation are improved. The knuckle arm generally comprises a fixed arm located on the outermost side and a movable arm located in the fixed arm, wherein one end of the fixed arm is mounted on the engineering machine, and the movable arm performs telescopic operation from the other end of the fixed arm.

In order to keep the telescopic device stably telescopic, the movable arm is mostly close to the adjacent movable arm or the fixed arm.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: the long-term flexible operation that slides of telescoping device's removal arm receives dead weight or outside carrier effect, and the fixed arm will constantly be close to between the removal arm that closes close to the fixed arm, between the adjacent removal arm, supports even subsides, and then leads to the flexible in-process frictional resistance increase of telescoping device, direct influence telescoping device's flexible operating efficiency.

Disclosure of Invention

In order to improve the flexible efficiency of telescoping device, this application provides a telescoping device and engineering machine tool.

In a first aspect, the present application provides a telescopic device, which adopts the following technical scheme:

a telescopic device comprises a fixed arm and a movable arm, wherein the movable arm is nested inside the fixed arm; and a guide mechanism is arranged between the fixed arm and the movable arm, and the rotation direction of the guide mechanism is tangent to the telescopic direction of the movable arm.

Through adopting above-mentioned technical scheme, the flexible operation of the relative fixed arm of travelling arm sets up guiding mechanism between the travelling arm that realizes flexible operation and fixed arm, makes through guiding mechanism and keeps the clearance between travelling arm and the fixed arm, can improve the laminating problem between travelling arm and the fixed arm, can effectively reduce the frictional resistance of the flexible in-process of travelling arm. And the guide mechanism can also rotate along with the extension and retraction of the movable arm, has a guide effect, can further reduce the frictional resistance of the movable arm in the telescopic process, and improves the telescopic efficiency.

Preferably, the guide mechanism comprises a first guide assembly; the first guide assembly is arranged on the inner side of the moving arm, and the first guide assembly partially penetrates through the side wall of the moving arm and abuts against the inner wall of the fixed arm.

Through adopting above-mentioned technical scheme, at the inboard first guide subassembly of installation of removal arm, reduce the influence that first guide subassembly leads to the clearance increase between removal arm and the fixed arm. And first direction subassembly supports and pastes in the fixed arm inner wall, is equivalent to and keeps equal clearance between messenger's movable arm and the fixed arm, improves because of the condition that takes place fixed arm and movable arm laminating for a long time to use.

Preferably, the first guide assembly comprises a first shaft and a plurality of first bearings; the side wall of the moving arm is provided with a first through hole matched with the first bearing; the first bearing is mounted in the first through-hole by a first shaft; the first bearing passes through the first through hole and abuts against the fixed arm.

Through adopting above-mentioned technical scheme, a plurality of first bearings are installed in the lateral wall of shifting arm by first axle rod, and the radius of first bearing is greater than the minimum interval of first axle rod center to the first opening outside, explains that most first direction subassembly is located first through-hole promptly, reduces the clearance size that first direction subassembly influences shifting arm and fixed arm. And the inside space of the movable arm is smaller relative to the outside of the movable arm, and the first guide assembly is arranged on the inside of the movable arm, so that the stability of the installation of the first shaft lever and the first bearing can be improved.

Preferably, a bearing sheath is fixedly sleeved outside the first bearing; the bearing sheath passes through the first through hole and abuts against the fixed arm.

Through adopting above-mentioned technical scheme, at first bearing outside suit bearing sheath, can further improve the wearability of first bearing, still can improve the uniformity of the slew velocity of a plurality of bearings, make flexible stability between fixed arm and the removal arm.

Preferably, the first guide assembly is mounted to the end of the movable arm that is normally located at the end of the movable arm that is located within the fixed arm.

Through adopting above-mentioned technical scheme, for guaranteeing that the telescoping device accomplishes the operation of stretching out, retracting smoothly, the removal arm keeps local suit in the fixed arm, and removal arm one end keeps being located the fixed arm promptly, installs first direction subassembly at the one end tip that the removal arm normality is located the fixed arm, can ensure that first direction subassembly all plays corresponding effect for the flexible operation overall process of removal arm.

Preferably, the first guide assembly is mounted to a top wall of the moving arm in a horizontally extended state.

By adopting the technical scheme, when the movable arm horizontally stretches, slantingly stretches upwards or slantingly stretches downwards, the stretching device is acted by the self gravity and the weight of the carrier, the movable arm takes one end of the movable arm, which is abutted against the fixed arm, as a fulcrum, according to the lever principle, the force borne by the top wall of the movable arm in the stretching state is larger than the force borne by other side walls, and the top wall of the movable arm is continuously abutted against the inner wall of the fixed arm; and install in the first guide assembly of removal arm roof and can make removal arm and fixed arm keep the clearance well, reduce the frictional resistance between the two, improve flexible operating efficiency.

Preferably, the guide mechanism further comprises a second guide assembly; the second guide assembly is arranged on the outer side of the fixed arm; the second guide assembly partially penetrates through the side wall of the fixed arm and abuts against the moving arm adjacent to the fixed arm.

Through adopting above-mentioned technical scheme, the lateral wall that the fixed arm was run through in the second direction subassembly part that adds supports in the travelling arm, plays direction, lubricated operation for the flexible operation of travelling arm together with first direction subassembly, further reduces the frictional resistance between travelling arm and the fixed arm, improves flexible operating efficiency. And the fixed arm is located telescoping device's the outside, installs the second guide assembly in the fixed arm outside, can avoid increasing the clearance between removal arm and the fixed arm.

Preferably, the second guide assembly comprises a second shaft and a plurality of second bearings; the outer side wall of the fixed arm is provided with two connecting lug blocks extending outwards; the side wall of the fixed arm is provided with a second through hole matched with the second bearing, and the second through hole is positioned between the two connecting lug blocks; the second bearing is arranged between the two connecting lug blocks through a second shaft rod and passes through the second through hole to abut against the moving arm adjacent to the fixed arm.

By adopting the technical scheme, the second guide component is arranged in the range limited by the two connecting lug blocks, so that the second guide component can be stably arranged outside the fixed arm; and the radius of the second bearing is larger than the minimum distance from the second shaft lever to the inner side of the second opening, so that the peripheral surface of the second bearing is kept abutting against the moving arm, and the functions of guiding and reducing friction resistance are realized.

Preferably, the second guide assembly abuts against the side wall of the moving arm opposite to the side where the first guide assembly is installed; and the second guide assembly is arranged at the end part of one end of the fixed arm, which is normally contacted with the moving arm.

Through adopting above-mentioned technical scheme, the second direction subassembly is installed at the one end tip of fixed arm and removal arm normal state contact, can make the second direction subassembly participate in the flexible overall process of removal arm, reduces the frictional resistance of the flexible direction process of telescoping device, improves flexible operating efficiency. And the second guide assembly is opposite to the first guide assembly and is respectively connected to two opposite side walls of the moving arm, so that the first guide assembly and the second guide assembly share the pressure applied to the guide assemblies. In particular, when the first guide member is located on the top wall of the movable arm in a state in which the movable arm is obliquely extended upward, the second guide member is located opposite to the bottom wall of the fixed arm in this state. According to the lever principle, the top wall of the moving arm is close to the fixed arm, the inner side of the end part of the fixed arm, which is in contact with the moving arm in the normal state, is a maximum stress area, and a gap can be kept between the moving arm and the fixed arm through the first guide assembly and the second guide assembly, so that the friction resistance is reduced.

In a second aspect, the present application provides an engineering machine, which adopts the following technical scheme:

a kind of engineering machinery, including the said telescoping device.

Through adopting above-mentioned technical scheme, this application engineering machine tool uses the telescoping device that has the guide effect, just has reduction frictional resistance, can improve engineering machine tool and use the telescoping device to carry out the efficiency of flexible operation.

In summary, the present application includes at least one of the following beneficial technical effects:

1. a guide mechanism is arranged between the movable arm and the fixed arm for realizing telescopic operation, and a gap is kept between the movable arm and the fixed arm through the guide mechanism, so that the problem of attachment between the movable arm and the fixed arm can be improved, the friction resistance in the telescopic process of the movable arm can be effectively reduced, and the telescopic efficiency is improved;

2. first direction subassembly supports pastes in the fixed arm inner wall, keeps the equal clearance in other words between messenger's removal arm and the fixed arm, improves because of the condition that takes place fixed arm and removal arm laminating for a long time, improves flexible operating efficiency.

3. The second guide assembly which is additionally arranged penetrates through the side wall of the fixed arm partially and abuts against the movable arm, and the second guide assembly and the first guide assembly together play a role in guiding and lubricating the telescopic operation of the movable arm, so that the frictional resistance between the movable arm and the fixed arm is further reduced, and the telescopic operation efficiency is improved;

4. the engineering machinery uses the telescopic device with the guiding function and the friction resistance reducing function, and the efficiency of the engineering machinery using the telescopic device for telescopic operation can be improved.

Drawings

FIG. 1 is a schematic view of the telescopic device in the embodiment of the present application in an extended state;

FIG. 2 is an enlarged view of part A of FIG. 1, mainly showing the structure of the guide mechanism;

FIG. 3 is a sectional structural view taken along the direction B-B in FIG. 1, which mainly shows the structure of a first guide assembly;

FIG. 4 is a sectional view in the direction C-C of FIG. 1, which mainly shows the structure of a second guiding assembly;

FIG. 5 is a schematic view of the retractable device in the retracted state according to the embodiment of the present application;

FIG. 6 is an enlarged view of the portion D in FIG. 5, which mainly shows the structure of the first channel, the second channel and the cylinder;

FIG. 7 is an enlarged view of section E in FIG. 5, which mainly shows the structure of the first and second ports;

fig. 8 is a schematic structural diagram of a construction machine according to an embodiment of the present application.

Description of reference numerals: 1. a fixed arm; 11. connecting the ear blocks; 12. a second port; 13. a sleeve; 14. a sleeve pipe port; 2. a moving arm; 21. a reinforcing rib plate; 22. a first port; 23. a support rib plate; 3. a guide mechanism; 31. a first guide assembly; 311. a first shaft lever; 312. a first bearing; 313. a bearing sheath; 32. a second guide assembly; 321. a second shaft lever; 322. a second bearing; 4. a telescopic cylinder; 41. a cylinder body; 42. a piston plate; 43. a piston rod; 44. a first channel; 441. a first lumen port; 442. a first fluid port; 45. a second channel; 451. a second through cavity port; 452. a second fluid port; 5. and (7) a gasket.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

Referring to fig. 1, the embodiment of the present application discloses a telescopic device, which includes a fixed arm 1 and a movable arm 2, wherein the movable arm 2 is nested in the fixed arm 1, and the movable arm 2 is telescopic relative to the fixed arm 1; a guide mechanism 3 is arranged between the fixed arm 1 and the moving arm 2, and the rotation direction of the guide mechanism 3 is tangent to the telescopic direction of the moving arm 2.

Set up guiding mechanism 3 between the removal arm 2 that realizes flexible operation and fixed arm 1, make through guiding mechanism 3 and keep the clearance between removal arm 2 and the fixed arm 1, can improve the laminating problem between removal arm 2 and the fixed arm 1, can effectively reduce the frictional resistance of removal arm 2 flexible in-process. And guiding mechanism 3 still can be along with the rotation of stretching out, retracting of removal arm 2, has the guide effect, can further reduce the frictional resistance of removal arm 2 flexible in-process, improves flexible efficiency.

Referring to fig. 2, the telescopic device includes a fixed arm 1, a moving arm 2, and a telescopic cylinder 4. The movable arm 2 is nested in the fixed arm 1, and the telescopic cylinder 4 drives and controls the movable arm 2 to perform telescopic operation relative to the fixed arm 1. A guide mechanism 3 is arranged between the fixed arm 1 and the moving arm 2, and the rotation direction of the guide mechanism 3 is tangent to the telescopic direction of the moving arm 2. The guide mechanism 3 includes a first guide member 31 and a second guide member 32.

The first guide member 31 is mounted on the top wall of the end portion of the moving arm 2 normally located at the one end inside the fixed arm 1. The second guide member 32 is mounted to the bottom wall of the end portion of the fixed arm 1 that is normally in contact with the moving arm 2.

When the movable arm 2 extends and retracts in the horizontal direction, or extends and retracts upwards along an incline or extends and retracts downwards along an incline, the extending and retracting device is under the action of self gravity and carrier weight, one end, abutted against the fixed arm 1, of the movable arm 2 serves as a fulcrum, according to the lever principle, the position, close to the fixed arm 1, of the top wall of the movable arm 2 and the inner side position, in the end portion, in the normal state, of the fixed arm 1, of the end portion, in contact with the movable arm 2, of the fixed arm 1 serve as a maximum stress area, and the top wall of the movable; and through the first guide assembly 31 installed on the top wall of the moving arm 2 and the second guide assembly 32 installed on the bottom wall of the fixed arm 1, a gap can be well kept between the moving arm 2 and the fixed arm 1, the frictional resistance between the moving arm 2 and the fixed arm 1 is reduced, and the telescopic operation efficiency is improved.

The telescopic device can be provided with a plurality of sections of moving arms 2 according to the requirements of construction use, and a first guide assembly 31 can be arranged between the adjacent moving arms 2.

Referring to fig. 2, a plurality of gaskets 5 are disposed on the outer wall of the moving arm 2 near one end of the first guide assembly 31, and the gaskets 5 are made of nylon. The gasket 5 has the functions of skid resistance, wear resistance and guiding. After the manufacturing of a general large-scale steel structure is finished, precision errors may exist, and the gap between the fixed arm 1 and the moving arm 2 is adjusted through the gasket 5, so that the relative telescopic operation between the fixed arm 1 and the moving arm 2 is smooth. And the spacer 5 improves the problem of mutual wear between the moving arm and the fixed arm. The 5 relative lubricous surfaces of gasket of nylon material, in the telescoping device normal use, can reduce the frictional force between removal arm and the fixed arm, improve the flexible efficiency of removal arm slip.

Referring to fig. 3, the moving arm 2 is provided with two reinforcing ribs 21 at the inner side of the ceiling corresponding to the first guide assembly 31, and the two reinforcing ribs 21 are adjacent to the other side walls connected to the ceiling. The first guide assembly 31 includes a first shaft 311, a plurality of first bearings 312, and a bearing sheath 313. The top wall of the moving arm 2 between the two reinforcing ribs 21 is provided with a first through hole 22 which is matched with the bearing sheath 313. The first bearing 312 is installed between the two reinforcing ribs 21 through the first shaft 311; the bearing sheath 313 passes through the first through opening 22 and abuts against the fixing arm 1. By mounting the first guide member 31 inside the moving arm 2, the mounting stability of the first guide member 31 can be improved.

Referring to fig. 4, the outer side wall of the fixing arm 1 is provided with two outwardly extending connecting lugs 11; and the side wall of the fixing arm 1 is provided with a second through hole 12 matched with the second bearing 322, and the second through hole 12 is positioned between the two connecting lug blocks 11. A sleeve 13 is connected between the two connecting lug blocks 11, and one side of the sleeve 13 is fixedly connected with the fixed arm 1; the sleeve 13 is provided with a sleeve through opening 13 which is matched and corresponding to the second through opening 12.

The second guide assembly 32 includes a second shaft 321 and a plurality of second bearings 322; the second bearing 322 is installed between the two connecting lugs 11 through the second shaft 321, and the second bearing 322 passes through the second through hole 12 and abuts against the moving arm 2 adjacent to the fixed arm 1. The inner diameter of the sleeve 13 is not smaller than the outer diameter of the second shaft 321. The second bearing 322 is installed between the two connecting lugs 11 through the second shaft 321, and the second bearing 322 passes through the second through hole 12 and the sleeve through hole 13 and abuts against the moving arm 2 adjacent to the fixed arm 1. The second guide member 32 is mounted within the range defined by the two connecting lugs 11, so that the second guide member 32 can be stably mounted outside the fixing arm 1.

Referring to fig. 2, the first bearing 312, the second bearing 322, and the bearing sheath 313 are generally high-pressure forged supports, have higher hardness than general mechanical materials, and have higher strength and pressure resistance than the movable arm 2 and the fixed arm 1 formed by welding steel plates. The bearing sheath 313, the first bearing 312 and the second bearing 322 are used as main parts which are in contact with the moving arm 2 or the fixed arm 1, bear the extrusion force between the moving arm 2 and the fixed arm 1, can greatly reduce deformation, ensure the gap between the moving arm 2 and the fixed arm 1, and ensure the smooth telescopic operation of the moving arm 2.

Referring to fig. 5, a plurality of support ribs 23 are disposed in the moving arm 2, and the support ribs 23 are obliquely and fixedly connected to the inner wall of the moving arm 2 relative to the axial direction of the moving arm 2, and can be used for supporting the moving arm 2 and reducing the bending of the moving arm 2 caused by an excessive force. The middle of the support rib plate 23 is provided with a through hole which is communicated with the telescopic cylinder 4, so that the telescopic cylinder 4 can be conveniently installed.

Referring to fig. 5 and 6, the telescopic cylinder 4 includes a cylinder body 41, a piston plate 42, and a piston rod 43. The cylinder 41 is attached to the moving arm 2. The piston plate 42 is slidably nested in the cylinder 41. One end of the piston rod 43 is fixed on the piston plate 42, and the other end of the piston rod 43 passes through the cylinder 41 and is hinged on the inner side of the end of the fixing arm 1 far away from the second guide assembly 32. The piston plate 42 drives the piston rod 43 to extend and retract along the inner cavity of the cylinder 41. The sum of the axial lengths of the piston rods 43 is greater than the axial length of the interior chamber of the cylinder 41.

When the telescopic device is in an upward inclined working position, if the telescopic cylinder 4 has leakage or lack of hydraulic medium, the cylinder body 41 moves in the direction of hinging the piston rod 43 and the fixed arm 1 along the axial direction under the action of the dead weight, the effective space in the inner cavity of the cylinder body 41 is compressed, the effective space is matched with a small amount of hydraulic medium only stored in the cylinder body 41, and the uncontrolled retraction of the telescopic device is slowed down.

Referring to fig. 6 and 7, a first channel 44 and a second channel 45 are arranged in the piston rod 43, and the directions of the first channel 44 and the second channel 45 are the same as the axial direction of the piston rod 43, wherein the first channel 44 extends towards the piston plate 42 and is provided with a first through cavity port 441, and the first through cavity port 441 is in normal communication with an inner cavity on the side of the cylinder body 41 away from the piston rod 43; the first passage 44 is provided with a first liquid port 442 near the end of the piston rod 43 hinged to the fixed arm 1. The second channel 45 is provided with a second cavity opening 451 at one end part of the piston rod 43 close to the piston plate 42, and the second cavity opening 451 is normally communicated with an inner cavity of the cylinder body 41 at one side close to the piston rod 43; the second passage 45 is provided with a second liquid port 452 near the end of the piston rod 43 that is hinged to the fixed arm 1. The telescopic cylinder 4 respectively fills the hydraulic medium into the inner cavities of the cylinder body 41 on the two sides of the piston plate 42 or discharges the hydraulic medium through the first channel 44 and the second channel 45, so that the piston rod 43 can move telescopically along the inner cavity of the cylinder body 41 along with the piston plate 42.

The embodiment of the application also discloses engineering machinery.

Referring to fig. 8, a working machine includes a telescopic device. This application engineering machine tool uses has the guiding action, just has the telescoping device that reduces frictional resistance, can improve engineering machine tool and use the telescoping device to carry out the efficiency of flexible operation. The engineering machinery can be an excavator, a digging vehicle, an engineering vehicle with a pile hammer arranged at the outer end part of a telescopic device and the like.

The implementation principle of a telescopic device and engineering machinery in the embodiment of the application is as follows:

referring to fig. 1 and 2, the present application installs a first guide assembly 31 and a second guide assembly 32 between a moving arm 2 and a fixed arm 1. The first guide member 31 is mounted on the top wall of the end portion of the moving arm 2 normally located at the one end inside the fixed arm 1. The second guide member 32 is mounted to the bottom wall of the end portion of the fixed arm 1 that is normally in contact with the moving arm 2. When the movable arm 2 extends and retracts in the horizontal direction, or extends and retracts upwards along an incline or extends and retracts downwards along an incline, the extending and retracting device is under the action of self gravity and carrier weight, one end, abutted against the fixed arm 1, of the movable arm 2 serves as a fulcrum, according to the lever principle, the position, close to the fixed arm 1, of the top wall of the movable arm 2 and the position, close to the movable arm 2, of the inner side of the end part, in the normal state, of the fixed arm 1, of the end part, in contact with the movable arm 2, of the fixed arm 1 serve as a maximum stress area, and the top; and through the first guide assembly 31 installed on the top wall of the moving arm 2 and the second guide assembly 32 installed on the bottom wall of the fixed arm 1, a gap can be well kept between the moving arm 2 and the fixed arm 1, the frictional resistance between the moving arm 2 and the fixed arm 1 is reduced, and the telescopic operation efficiency is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. A telescopic device, characterized in that: the device comprises a fixed arm (1) and a movable arm (2), wherein the movable arm (2) is nested on the inner side of the fixed arm (1); and a guide mechanism (3) is arranged between the fixed arm (1) and the moving arm (2), and the rotation direction of the guide mechanism (3) is tangent to the telescopic direction of the moving arm (2).

2. The telescopic device according to claim 1, wherein: the guide mechanism (3) comprises a first guide assembly (31); the first guide assembly (31) is installed on the inner side of the moving arm (2), and the first guide assembly (31) partially penetrates through the side wall of the moving arm (2) and abuts against the inner wall of the fixed arm (1).

3. The telescopic device according to claim 2, wherein: the first guide assembly (31) comprises a first shaft (311) and a plurality of first bearings (312); the side wall of the moving arm (2) is provided with a first through hole (22) matched with the first bearing (312); the first bearing (312) is mounted in the first through opening (22) by a first shaft (311); the first bearing (312) passes through the first through hole (22) and abuts against the fixed arm (1).

4. The telescopic device according to claim 3, wherein: a bearing sheath (313) is fixedly sleeved on the outer side of the first bearing (312); the bearing sheath (313) passes through the first through hole (22) and abuts against the fixed arm (1).

5. The telescopic device according to claim 2, wherein: the first guide assembly (31) is arranged at the end part of one end of the moving arm (2) which is normally positioned in the fixed arm (1).

6. The telescopic device according to claim 2, wherein: the first guide assembly (31) is arranged on the top wall of the moving arm (2) in a horizontally extending state.

7. The telescopic device according to claim 2, wherein: the guide mechanism (3) further comprises a second guide assembly (32); the second guide assembly (32) is arranged on the outer side of the fixing arm (1); the second guide assembly (32) partially penetrates through the side wall of the fixed arm (1) and abuts against the moving arm (2) adjacent to the fixed arm (1).

8. The telescopic device according to claim 7, wherein: the second guide assembly (32) comprises a second shaft (321) and a plurality of second bearings (322); the outer side wall of the fixed arm (1) is provided with two connecting lug blocks (11) extending outwards; the side wall of the fixing arm (1) is provided with a second through hole (12) matched with the second bearing (322), and the second through hole (12) is positioned between the two connecting lug blocks (11); the second bearing (322) is arranged between the two connecting lug blocks (11) through a second shaft rod (321), and the second bearing (322) passes through the second through hole (12) and abuts against the moving arm (2) adjacent to the fixed arm (1).

9. The telescopic device according to claim 7, wherein: the second guide assembly (32) abuts against the side wall of the moving arm (2) opposite to the side where the first guide assembly (31) is installed; and the second guide assembly (32) is arranged at the end part of one end of the fixed arm (1) which is normally contacted with the moving arm (2).

10. A construction machine characterized in that: comprising a telescopic device according to any of claims 1-9.

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