CN218881025U - Movable arm hydraulic cylinder protection device of explosion-proof excavator - Google Patents

Abstract

The utility model discloses an explosion-proof excavator swing arm pneumatic cylinder protector, include: the fixed protection plate is fixedly arranged on one side, facing the excavator bucket, of the cylinder body of the movable arm hydraulic cylinder and used for preventing the elastic sheet from damaging the cylinder body from the front side; and the movable protection plate is fixedly arranged on one side, facing the excavator bucket, of the piston rod of the movable arm hydraulic cylinder and used for preventing the elastic sheet from damaging the piston rod from the front side, and the movable protection plate is connected with the fixed protection plate in a sliding mode. Has the advantages that: the technical scheme of the utility model set up protector through the front at the swing arm pneumatic cylinder of explosion-proof excavator and block that the shell fragment destroys the pneumatic cylinder from openly, neither influence the swing arm activity, do not shelter from driver's sight again, protector can directly install additional on conventional excavator moreover, need not the customization excavator, and is with low costs, and protector simple structure adopts detachable structural design, changes and maintains that simple and convenient.

Description

Movable arm hydraulic cylinder protection device of explosion-proof excavator

Technical Field

The utility model relates to an explosion-proof technical field, in particular to explosion-proof excavator swing arm pneumatic cylinder protector.

Background

When the fired shell has a dummy bullet, potential safety threats can be caused to various facilities, equipment and personnel around the dummy bullet, so that the dummy bullet needs to be removed immediately to eliminate the safety threats.

At present, explosion-proof excavators are mostly adopted to excavate dumb bullets in the prior art so as to eliminate potential safety hazards.

However, most of the explosion-proof excavators in the prior art only perform strengthening treatment on a bucket, an extending arm, a movable arm, a cab and a chassis of the excavator to resist penetration of a shrapnel caused by false explosion of a dummy bomb in the excavating process, and the movable arm hydraulic cylinder directly exposed in the attack range of the shrapnel is not effectively protected, so that the movable arm hydraulic cylinder is often damaged by the shrapnel attack, and the reason is as follows:

firstly, the hydraulic cylinder is made of bulletproof materials directly, and particularly, the problems that the processing of a cylinder body and a piston rod is difficult to overcome exist, the manufacturing cost is very high, and meanwhile, a reliable bulletproof effect is to be realized, the volume of the hydraulic cylinder is larger than that of a common movable arm hydraulic cylinder on the existing excavator, the use of the large-volume hydraulic cylinder tends to cause linkage change of the whole excavator structure, the excavator needs to be produced in a customized manner, the cost is high, and the replacement of hydraulic cylinder parts in later maintenance is also a large expense, so that the technical route for realizing the bulletproof effect by performing strengthening treatment on the hydraulic cylinder is not feasible;

secondly, the movable arm hydraulic cylinder is close to the excavator cab and the movable arm, the movable arm needs to swing up and down in the working process of the excavator, the required moving space is large, and the sight of a driver cannot be shielded, so that the space left for arranging the movable arm hydraulic cylinder and the auxiliary protection device is very small, the increase of the volume of the movable arm hydraulic cylinder is limited, and the protection device capable of effectively resisting the attack of the elastic sheet is arranged around the hydraulic cylinder.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an explosion-proof excavator movable arm pneumatic cylinder protector aims at solving the problem that current explosion-proof excavator's movable arm pneumatic cylinder easily suffers the shell fragment attack and damages.

In order to solve the problem, the utility model provides an explosion-proof excavator movable arm pneumatic cylinder protector, include:

the fixed protection plate is fixedly arranged on one side, facing the excavator bucket, of the cylinder body of the movable arm hydraulic cylinder and used for preventing the elastic sheet from damaging the cylinder body from the front side;

and the movable protection plate is fixedly arranged on one side, facing the excavator bucket, of the piston rod of the movable arm hydraulic cylinder and used for preventing the elastic sheet from damaging the piston rod from the front side, and the movable protection plate is connected with the fixed protection plate in a sliding mode.

In one embodiment, the dynamic protection plate is formed by stacking 30mm bulletproof steel plates, 30mm bulletproof ceramic plates and 10mm high-strength glass fiber plates.

In one embodiment, the fixed protection plate is made of a 30mm thick bulletproof steel plate.

In one embodiment, a sliding cylinder is fixedly arranged on the fixed protection plate, and the movable protection plate is slidably connected with the sliding cylinder.

In one embodiment, a sliding limiting plate is fixedly arranged on the inner wall of the sliding cylinder and slides along the outer wall surface of the movable protection plate;

be equipped with in the limiting plate that slides and hold chamber and cylindrical groove, the bottom and the cylindrical groove intercommunication in holding the chamber, the limiting plate that slides is hugged closely and is equipped with the opening that communicates with cylindrical groove on the side of moving the guard plate, cylindrical inslot gyration is installed the lubricating roller, be equipped with many sand grips along axial extension on the outer periphery of lubricating roller, the rotatory protractile opening of sand grip.

In one embodiment, the upper surface of the sliding position limiting plate is an inclined surface, and the high end of the inclined surface is tightly attached to the outer wall surface of the movable protection plate.

In one embodiment, the fixed protection plate comprises a protection plate II and protection plates I fixedly arranged on two sides of the protection plate II, the protection plate I is fixedly connected with the cylinder body, and the protection plate II is used for resisting the elastic sheet to damage a hydraulic pipeline of the movable arm hydraulic cylinder from the front;

the two first protection plates and the two second protection plates jointly define a movable space for the movable arm of the excavator to swing up and down.

In one embodiment, a fourth protection plate is fixedly arranged on one side of the first protection plate, which is far away from the movable arm of the excavator, and is used for preventing the elastic sheet from damaging the movable arm hydraulic cylinder from the side surface.

In one embodiment, the length of the protection plate four is the sum of the lengths of the cylinder body and the piston rod.

In one embodiment, the two sides of the movable protection plate are fixedly provided with side sliding plates, the upper end and the lower end of the movable protection plate are fixedly provided with end cover plates, the end cover plates are fixedly connected with the side sliding plates, and the side sliding plates replace the movable protection plate to be tightly attached to the sliding limit plate and connected with the sliding limit plate in a sliding mode.

Has the advantages that: the technical scheme of the utility model is that the protective device is arranged on the front side of the movable arm hydraulic cylinder of the explosion-proof excavator to prevent the elastic sheet from damaging the hydraulic cylinder from the front side, thereby not influencing the movement of the movable arm and not shielding the sight of a driver in a cab, and the protective device can be directly additionally arranged on the conventional excavator without customizing the excavator, so that the cost is low, the structure of the protective device is simple, the detachable structural design is adopted, and the replacement, maintenance and maintenance are simple and convenient;

in addition, the dummy bullet mistake is exploded and is taken place at the scraper bowl of excavator usually and is excavating the in-process of dummy bullet, and consequently the rupture point of dummy bullet is located the dead ahead of swing arm pneumatic cylinder all the time, and the shell fragment can strike the swing arm pneumatic cylinder from the front of swing arm pneumatic cylinder, so the utility model discloses a protector sets up the attack that the front of swing arm pneumatic cylinder can effectively resist the shell fragment, protects the safety of swing arm pneumatic cylinder, avoids the swing arm pneumatic cylinder to suffer the shell fragment attack and damage.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the explosion-proof excavator of the present invention;

FIG. 2 is an enlarged view of portion B of FIG. 1;

FIG. 3 is a first schematic structural diagram of the boom cylinder protecting device of the explosion-proof excavator of the present invention;

FIG. 4 is a second schematic structural view of the hydraulic cylinder protecting device of the movable arm of the explosion-proof excavator of the present invention;

FIG. 5 is an enlarged view of portion A of FIG. 4;

fig. 6 is a third schematic structural view of the hydraulic cylinder protecting device of the movable arm of the explosion-proof excavator of the present invention;

fig. 7 is a schematic structural view of the slide restriction plate;

FIG. 8 is an enlarged view of portion C of FIG. 7;

FIG. 9 is a schematic view of the structure of the lubricating roller;

FIG. 10 is an enlarged view of section D of FIG. 9;

fig. 11 is an internal structural view of the slide restricting plate;

FIG. 12 is an enlarged view of section E of FIG. 11;

FIG. 13 is a top view of a first limiting plate;

fig. 14 is a plan view of the second stopper plate.

The reference numerals are explained below:

1. a cylinder body; 2. a piston rod;

3. fixing a protection plate; 31. a first protection plate; 32. a second protection plate; 33. a fourth protection plate;

4. a slide cylinder;

5. a movable protection plate; 52. a side slide plate; 53. an end cover plate;

6. a sliding limit plate; 61. a first limiting plate; 62. a second limiting plate; 63. a third limiting plate; 64. an accommodating chamber; 65. filling holes; 66. mounting grooves; 67. a lubricating roller; 68. a convex strip; 69. an opening;

7. an activity space; 8. and a movable arm.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, back, ...) are provided in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "secured" are to be construed broadly, and thus, for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B", including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides an explosion-proof excavator swing arm pneumatic cylinder protector, this explosion-proof excavator swing arm pneumatic cylinder protector set up protector through the front at explosion-proof excavator's swing arm pneumatic cylinder to keep out the shell fragment and destroy the pneumatic cylinder from the front, neither influence the activity of swing arm 8, do not shelter from the driver's sight in the cockpit again, and protector can directly install additional on conventional excavator, need not to customize the excavator, with low costs, protector simple structure, change and maintain simple and convenient;

in addition, the dummy bullet mistake is exploded and is taken place at the scraper bowl of excavator in-process that excavates the dummy bullet usually, and consequently the rupture point of dummy bullet is located the dead ahead of movable arm pneumatic cylinder all the time, and the shell fragment can strike the movable arm pneumatic cylinder from the front of movable arm pneumatic cylinder, so the utility model discloses a protector sets up the attack that can effectively resist the shell fragment in the front of movable arm pneumatic cylinder, protects the safety of movable arm pneumatic cylinder, avoids the movable arm pneumatic cylinder to suffer the shell fragment attack and damage.

Specifically, in an embodiment of the present invention, as shown in fig. 1 and 2, the protecting device for the boom cylinder of the explosion-proof excavator includes a fixed protecting plate 3 and a movable protecting plate 5, wherein the fixed protecting plate 3 is fixedly disposed on a side of the cylinder body 1 of the boom cylinder facing a bucket of the excavator, and is used for preventing the cylinder body 1 from being damaged by the elastic sheet from the front; the movable protection plate 5 is fixedly arranged on one side, facing a bucket of the excavator, of the piston rod 2 of the movable arm hydraulic cylinder and used for preventing the piston rod 2 from being damaged by the elastic sheet from the front side, and due to the fact that the false explosion of the dummy bomb usually occurs in the process that the bucket of the excavator is excavating the dummy bomb, the explosion point of the dummy bomb is always located right in front of the movable arm hydraulic cylinder, and the elastic sheet can impact the movable arm hydraulic cylinder from the front side of the movable arm hydraulic cylinder, so that the fixed protection plate 3 and the movable protection plate 5 can effectively resist the attack of the elastic sheet, the safety of the cylinder body 1 and the piston rod 2 is protected, and the movable arm hydraulic cylinder is prevented from being damaged due to the attack of the elastic sheet.

In the present embodiment, in order that the movable fender 5 does not affect the operation of the boom cylinder, the movable fender 5 is slidably connected to the fixed fender 3 as shown in fig. 2 to 4.

Preferably, the movable protection plate 5 is formed by stacking three plates of a 685 bulletproof steel plate with the thickness of 30mm, a 30mm bulletproof ceramic plate and a 10mm high-strength glass fiber plate, one side of the bulletproof steel plate is fixedly connected with the bulletproof ceramic plate, the other side of the bulletproof steel plate is fixedly connected with the high-strength glass fiber plate, the high-strength glass fiber plate is fixedly connected with the piston rod 2, a shrapnel generated by false explosion of a dummy is firstly contacted with the bulletproof ceramic plate, the shrapnel is contacted with the bulletproof steel plate after penetrating through the bulletproof ceramic plate, if the shrapnel can also penetrate through the bulletproof steel plate, the shrapnel is finally contacted with the high-strength glass fiber plate, the shrapnel is sequentially blocked by the bulletproof ceramic plate, the bulletproof steel plate and the high-strength glass fiber plate, kinetic energy of the shrapnel is reduced, and safety of the hydraulic cylinder is protected, the fixed protection plate 3 is made of the 685 bulletproof steel plate with the thickness of 30mm, and the design is adopted, so that the fixed protection plate 3 and the movable protection plate 5 can effectively resist explosion damage effects of the dummy bullets with the equivalent of more than 10m of 12kgTNT, and effectively protect the piston rod 2 and the cylinder body 1 of the movable arm 8.

Further, in this embodiment, in order to make the movable protection plate 5 and the fixed protection plate 3 slide stably and reliably, as shown in fig. 2 to 5, a sliding cylinder 4 is fixedly arranged on the fixed protection plate 3, the movable protection plate 5 is slidably connected with the sliding cylinder 4, preferably, the movable protection plate 5 slidably penetrates through the sliding cylinder 4, and the cross section of the sliding cylinder 4 is U-shaped.

Furthermore, in this embodiment, as shown in fig. 5, side sliding plates 52 are fixedly disposed on two sides of the movable protection plate 5, end cover plates 53 are fixedly disposed at upper and lower ends of the movable protection plate 5, the end cover plates 53 are fixedly connected with the side sliding plates 52, the side sliding plates 52 are slidably connected with the inner wall of the sliding barrel 4, the movable protection plate 5 is wrapped by the upper and lower end cover plates 53 and the left and right side sliding plates 52, and the movable protection plate 5 is slidably connected with the inner wall of the sliding barrel 4 by the side sliding plates 52.

In this embodiment, as shown in fig. 5, a sliding limiting plate 6 is fixedly arranged on the inner wall of the sliding barrel 4, the sliding limiting plate 6 slides along the outer wall surface of the side sliding plate 52, in order to facilitate the installation of the side sliding plate 52 to penetrate through the sliding barrel 4, the inner space of the sliding barrel 4 can be designed to be larger, after the movable protection plate 5 penetrates through the sliding barrel 4, the sliding limiting plate 6 is fixedly arranged on the inner wall of the sliding barrel 4, and the side sliding plate 52 is limited by the sliding limiting plate 6, so that the movable protection plate can only slide up and down in the sliding barrel 4.

Further, in this embodiment, as shown in fig. 7, the sliding position limiting plate 6 includes a first position limiting plate 61, a second position limiting plate 62, and a third position limiting plate 63, a lower end surface of the second position limiting plate 62 is detachably and sealingly fixedly connected with an upper end surface of the first position limiting plate 61, and an upper end surface of the second position limiting plate 62 is detachably and sealingly fixedly connected with a lower end surface of the third position limiting plate 63; as shown in fig. 11 to 13, the lower end surface of the second limit plate 62 and the upper end surface of the first limit plate 61 are both provided with a semi-cylindrical mounting groove 66, the two mounting grooves 66 are aligned to form a cylindrical groove, and the cylindrical groove forms a rectangular opening 69 at the joint of the same side surfaces of the first limit plate 61 and the second limit plate 62, as shown in fig. 8, when the sliding limit plate 6 is mounted in the sliding barrel 4, the side surface of the sliding limit plate 6 provided with the opening 69 slides against the outer wall surface of the side sliding plate 52, as shown in fig. 5; a lubricating roller 67 is rotatably mounted in the cylindrical groove, the length of the lubricating roller 67 is equal to that of the cylindrical groove, two end faces of the lubricating roller 67 can be tightly attached to inner walls of two ends of the cylindrical groove to slide, as shown in fig. 9-12, a plurality of convex strips 68 are arranged on the outer circumferential surface of the lubricating roller 67, the convex strips 68 are parallel to the axis of the lubricating roller 67, the length of the convex strips 68 is equal to that of the lubricating roller 67, the rotating radius of the convex strips 68 is equal to that of the cylindrical groove, the convex strips 68 are tightly attached to the inner walls of the cylindrical groove to slide, as shown in fig. 8, the convex strips 68 can extend out of the openings 69; as shown in fig. 11 to 14, accommodating cavities 64 which are communicated with each other are formed in the second limiting plate 62 and the third limiting plate 63, and a filling hole 65 which is communicated with the accommodating cavity 64 is further formed in the third limiting plate 63, as shown in fig. 7; as shown in fig. 11 and 12, the lower end of the accommodating cavity 64 in the second limit plate 62 is communicated with the cylindrical groove, so that the lubricating roller 67 does not rotate after lubricating oil or grease is filled into the accommodating cavity 64 through the filling hole 65, the lubricating oil or grease in the accommodating cavity 64 is not reduced, when the lubricating roller 67 rotates (regardless of forward rotation or reverse rotation), the lubricating oil or grease in the accommodating cavity 64 is gradually filled into the cavity between all the two adjacent convex strips 68, the cavity is sealed by the two convex strips 68 and the inner walls at the two ends of the cylindrical groove, and when the lubricating oil or grease in the cavity comes to the opening 69, the side sliding plate 52 presses the convex strips 68, so that the lubricating oil or grease in the cavity is attached to the side sliding plate 52, and oil lubrication or grease lubrication of the side sliding plate 52 is completed; the raised lines 68 on the surface of the lubricating roller 67 are made of rubber, the rubber has elasticity, can receive the extrusion of the side sliding plate 52 without being damaged, and meanwhile, the rubber has good friction performance, so that the side sliding plate 52 can be ensured to move up and down to reliably drive the lubricating roller 67 to rotate.

Certainly, in other embodiments, the sliding limit plate 6 may also be made of a teflon material, which has a self-lubricating characteristic, a low friction coefficient, and a good load-bearing capacity, and is helpful to reduce wear between the side sliding plate 52 and the sliding limit plate 6, and compared with the conventional lubricating methods such as oil lubrication and grease lubrication, the trouble of periodically filling lubricating oil or grease is eliminated.

Furthermore, as shown in fig. 5, the upper surface of the sliding limit plate 6 is an inclined surface, and the high end of the inclined surface is tightly attached to the outer wall surface of the side sliding plate 52, so that even if dust caused by the false explosion of the dead bomb falls on the outer wall surface of the side sliding plate 52, in the downward sliding process of the side sliding plate 52, the dust can be scraped off by the sliding limit plate 6, and the dust scraped off by the sliding limit plate 6 rolls off the inclined surface and falls off the ground without accumulating on the sliding limit plate 6, so that the outer wall surface of the side sliding plate 52 is smooth, and the abrasion between the side sliding plate 52 and the sliding limit plate 6 is ensured not to be aggravated.

In the present embodiment, as shown in fig. 2 to 4, the fixed shielding plate 3 includes a second shielding plate 32 and first shielding plates 31 fixedly disposed at both sides of the second shielding plate 32, and the two first shielding plates 31 respectively shield one boom cylinder, so that the boom cylinder protecting apparatus for an explosion-proof excavator of the present embodiment is suitable for an excavator in which one cylinder is disposed at both sides of the boom 8.

Specifically, the first protection plate 31 is fixedly connected with the cylinder body 1, and the second protection plate 32 is used for preventing the elastic sheet from damaging a hydraulic pipeline of the movable arm hydraulic cylinder from the front side, so that the safety of the hydraulic pipeline is ensured; the two protection plates I31 and II 32 jointly define a movable space 7 for the excavator movable arm 8 to swing up and down.

Further, in this embodiment, as shown in fig. 6, a first protection plate 31 is fixedly provided with a fourth protection plate 33 on a side away from the boom 8 of the excavator, the boom hydraulic cylinder is damaged from the side by a resisting spring sheet of the fourth protection plate 33, so as to ensure the safety of the boom hydraulic cylinder, and the fourth protection plate 33 has the same structure as the fixed protection plate 3 and is made of a 30 mm-thick bulletproof steel plate.

In the present embodiment, the length of the four protection plates 33 is the sum of the lengths of the cylinder 1 and the piston rod 2, so that the four protection plates 33 can always provide protection for the piston rod 2 and the cylinder 1 from the side regardless of how the piston rod 2 extends and retracts on the cylinder 1.

In this embodiment, as shown in fig. 2 to fig. 4, the hydraulic cylinder protector for the movable arm of the explosion-proof excavator has a simple structure, the first protection plate 31, the second protection plate 32 and the fourth protection plate 33 which form the fixed protection plate 3 are detachably and fixedly connected, the side sliding plate 52 and the end cover plate 53 which are arranged outside the movable protection plate 5 are detachably and fixedly connected with the movable protection plate 5, and the sliding limiting plate 6 and the sliding cylinder 4 are also detachably and fixedly connected.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims (10)

1. The utility model provides an explosion-proof excavator movable arm pneumatic cylinder protector which characterized in that includes:

the fixed protection plate is fixedly arranged on one side, facing the excavator bucket, of the cylinder body of the movable arm hydraulic cylinder and used for preventing the elastic sheet from damaging the cylinder body from the front side;

and the movable protection plate is fixedly arranged on one side, facing the excavator bucket, of the piston rod of the movable arm hydraulic cylinder and used for preventing the elastic sheet from damaging the piston rod from the front side, and the movable protection plate is connected with the fixed protection plate in a sliding mode.

2. The device for protecting the hydraulic cylinder of the movable arm of the explosion-proof excavator in claim 1, wherein the movable protection plate is formed by stacking 30mm bulletproof steel plates, 30mm bulletproof ceramic plates and 10mm high-strength glass fiber plates.

3. The boom cylinder guard of an explosion-proof excavator according to claim 1, wherein said fixed guard plate is made of a bulletproof steel plate having a thickness of 30 mm.

4. The device for protecting the hydraulic cylinder of the movable arm of the explosion-proof excavator as claimed in claim 1, wherein a sliding cylinder is fixedly arranged on the fixed protection plate, and the movable protection plate is slidably connected with the sliding cylinder.

5. The boom hydraulic cylinder protecting device of the explosion-proof excavator as claimed in claim 4, wherein a sliding limiting plate is fixedly arranged on the inner wall of the sliding cylinder, and the sliding limiting plate slides along the outer wall surface of the movable protection plate in a clinging manner;

be equipped with in the sliding limiting plate and hold chamber and cylindrical groove, the bottom and the cylindrical groove intercommunication that hold the chamber, sliding limiting plate hugs closely and is equipped with the opening that communicates with cylindrical groove on the side of moving the guard plate, cylindrical inslot gyration is installed the lubrication roller, be equipped with many sand grips along axial extension on the outer periphery of lubrication roller, the rotatory protractile opening of sand grip.

6. The protecting device for the movable arm hydraulic cylinder of the explosion-proof excavator as claimed in claim 5, wherein the upper surface of the sliding limiting plate is an inclined surface, and the high end of the inclined surface is tightly attached to the outer wall surface of the movable protecting plate.

7. The protecting device for the movable arm hydraulic cylinder of the explosion-proof excavator as claimed in claim 1, wherein the fixed protecting plate comprises a protecting plate II and a protecting plate I fixedly arranged on two sides of the protecting plate II, the protecting plate I is fixedly connected with the cylinder body, and the protecting plate II is used for resisting the elastic sheet to damage the hydraulic pipeline of the movable arm hydraulic cylinder from the front;

the two first protection plates and the two second protection plates jointly define a movable space for the movable arm of the excavator to swing up and down.

8. The protecting device for the hydraulic cylinder of the movable arm of the explosion-proof excavator as claimed in claim 7, wherein a fourth protecting plate is fixedly arranged on one side of the first protecting plate, which is far away from the movable arm of the excavator, and is used for preventing the elastic sheet from damaging the hydraulic cylinder of the movable arm from the side surface.

9. The boom cylinder guard of an explosion proof excavator according to claim 8, wherein the length of the guard plate four is the sum of the lengths of the cylinder and the piston rod.

10. The protecting device for the movable arm hydraulic cylinder of the explosion-proof excavator as claimed in claim 5, wherein side sliding plates are fixedly arranged on two sides of the movable protection plate, end cover plates are fixedly arranged on the upper end and the lower end of the movable protection plate, the end cover plates are fixedly connected with the side sliding plates, and the side sliding plates are closely attached to and slidably connected with the sliding limiting plate instead of the movable protection plate.

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