CN216515830U - Counterweight, rock breaking device and rock breaking construction machine - Google Patents

Abstract

The utility model provides a counterweight, a rock breaking device and rock breaking construction machinery, and belongs to the field of rock breaking construction equipment. The counterweight comprises a counterweight body, wherein a guide groove is formed in the side surface of the counterweight body; the guide groove is in a strip shape and comprises two groove walls which are oppositely arranged; the two slot walls are adapted to cooperate with guide members on the small arm. When the device is used, the guide assemblies on two sides of the small arm of the rock breaking device are matched with the guide grooves of the corresponding counterweights, and when the oil cylinder of the rock breaking device stretches, the upper part of the counterweights can move relative to the small arm; at this time, the balance weight can slide along the guide assembly through the self-guide groove. And set up the direction recess through sunken mode at the medial surface of counter weight, be favorable to preventing to guarantee that counter weight and pipeline take place to reduce the total width of two counter weights under the condition of interfering to increase broken rock device's operation flexibility.

Description

Counterweight, rock breaking device and rock breaking construction machine

Technical Field

The utility model relates to the field of rock breaking construction equipment, in particular to a counterweight, a rock breaking device and rock breaking construction machinery.

Background

At present, a rock breaking device with a rock breaker (such as a ripper or a breaking hammer) carried by an excavator body is widely used in rock breaking operation. The rock breaking device comprises a large arm, a small arm and a rock breaker, wherein one end of the large arm is hinged with the upper vehicle body, and the other end of the large arm is hinged with the small arm; one end of the small arm oil cylinder is hinged with the large arm, and the other end of the small arm oil cylinder is hinged with the small arm; the tip that the forearm kept away from the forearm hydro-cylinder is articulated with the agitator, and agitator hydro-cylinder one end is articulated with the forearm, and the agitator hydro-cylinder other end is connected with agitator direct or indirect. The two sides of the small arm of the rock breaking device are respectively provided with a balance weight, and the lower part of the balance weight is hinged with the scarifier or hinged with the first connecting rod or the second connecting rod. In order to enable the upper part of the counterweight to slide along the guide assembly, it is necessary to provide a dedicated counterweight.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a counter weight, it can be through the cooperation of direction recess and guide assembly on self medial surface to make the upper portion of counter weight can follow guide assembly and slide.

Another object of the present application is to provide a rock breaking device, which employs the above counterweight.

Another object of this application still lies in providing a broken rock construction machinery, and it has adopted above-mentioned broken rock device.

The utility model is realized by the following steps:

a counterweight is used for a rock breaking device and comprises a counterweight body, wherein a guide groove is formed in the inner side surface of the counterweight body; the guide groove is strip-shaped and comprises a groove bottom and two groove walls which are oppositely arranged; the two groove walls are used for being matched with the guide component on the small arm.

Such structure setting benefit lies in, has between the medial surface of counter weight and the forearm to be provided with agitator cylinder hydraulic line usually, and the guide rail has great length relatively, if the guide rail is located the medial surface, the guide rail interferes with hydraulic line easily. In this case, in order to prevent interference, the distance between the inner side surface of the counterweight and the small arm needs to be increased, which directly results in a larger total width of the two counterweights, and thus the flexibility of the rock breaking device in slope operation and trench operation is reduced. And in this application, and set up the direction recess through sunken mode at the medial surface of counter weight body, be favorable to preventing that counter weight and pipeline from taking place to reduce the total width of two counter weights under the condition of interfering to increase the operation flexibility of broken rock device.

Furthermore, the counterweight also comprises two guide rails which are arranged in the guide groove and are respectively connected with the two groove walls; the two guide plates extend along the length direction of the guide groove.

The guide rail is matched with the guide assembly, so that the friction force can be reduced; the wear resistance of the guide rail is obviously higher than the groove wall of the guide groove, so that the guide rail can prolong the service life of the balance weight. In addition, the guide rail is arranged in the guide groove, so that the guide rail can be prevented from interfering with the hydraulic pipeline.

Further, the lower end of the guide groove is provided with an opening through which the guide assembly can pass.

Because the balance weight is integrally heavier, a crane or a traveling crane is generally required for hoisting during assembly. After the opening is arranged at the lower end of the guide groove, when the balance weight is installed, the rolling device on the guide assembly is inserted between the two guide rails arranged in the guide groove through the opening from the upper side of the balance weight, and the rolling device does not need to be independently disassembled and assembled. When the balance weight is dismounted, the balance weight is lifted from bottom to top, the rolling device is moved out of the guide groove from the opening, and the rolling device does not need to be dismounted. Therefore, the design improves the convenience of the disassembly and the assembly of the counterweight.

Further, the lower end of the counterweight is provided with a hinged part.

A rock breaking device comprises a small arm, a rock breaker oil cylinder and two balance weights; the rock breaker with the lower extreme of forearm is articulated, the one end of rock breaker hydro-cylinder with the forearm is connected, the other end with rock breaker direct connection or indirect connection. The rock breaking device further comprises two guide assemblies, and the balance weights are respectively located on two sides of the small arm; the counterweight is hinged with the rock breaker; or the counterweight is hinged with an intermediate connecting piece, and the intermediate connecting piece is hinged with the rock breaker.

The two guide assemblies are respectively arranged on two side faces of the small arm, guide grooves are formed in the two balance weights, and when the balance weights move relative to the small arm, the balance weights are in sliding fit or rolling fit with the corresponding guide assemblies through the guide grooves of the balance weights.

Further, the intermediate connecting member includes a first connecting rod and a second connecting rod; the rock breaker is hinged with the lower end of the small arm and the first connecting rod at the same time, one end of the second connecting rod is hinged with the small arm, and the other end of the second connecting rod is hinged with the first connecting rod; one end of the rock breaker oil cylinder is hinged with the small arm, and the other end of the rock breaker oil cylinder is hinged with the first connecting rod or the second connecting rod.

And the two ends of the connecting piece are respectively movably connected with the two balance weights.

The connecting piece can limit the transverse distance between the two counterweights; due to the movable connection, when the balance weight has manufacturing errors or installation errors, the two balance weights can move relatively within a certain range, so that the guide assemblies on two sides of the small arm can be matched with the corresponding guide rails.

Furthermore, two ends of the connecting piece are respectively provided with an insertion end, and the insertion ends are parallel or approximately parallel to the inner side surface of the balance weight; the counterweight is provided with a fixing hole; the inserting ends are inserted into the corresponding fixing holes.

After the insertion end of the connecting piece is inserted into the fixing hole, the connecting piece can limit the transverse distance of the counter weights at the two sides of the small arm at the position and can enable the position to rotate around the hinged part at the lower end of the counter weight, so that the guide assemblies at the two sides of the small arm can be easily and simultaneously contacted with the guide rails in the guide grooves; thereby leading the weight of the balance weights at the two sides of the small arm to respectively act on the guide components at the two sides of the small arm. The design can prolong the service life of the guide assembly and the guide rail.

The utility model provides a broken rock construction machinery, broken rock construction machinery includes excavator body and above-mentioned broken rock device, the excavator body with broken rock device's forearm is connected.

The technical scheme provided by the utility model has the beneficial effects that:

when the counterweight, the rock breaking device and the rock breaking construction machine are used, the guide assemblies on two sides of the small arm of the rock breaking device are matched with the guide grooves of the corresponding counterweight, and when the oil cylinder of the rock breaking device stretches, the upper part of the counterweight can move relative to the small arm; at this time, the balance weight can slide along the guide assembly through the self-guide groove. And set up the direction recess through sunken mode at the medial surface of counter weight, be favorable to preventing to guarantee that counter weight and pipeline take place to reduce the total width of two counter weights under the condition of interfering to increase broken rock device's operation flexibility.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a side view of a rock breaking device provided in embodiment 1 of the present application, which is mounted on an excavator body;

fig. 2 is a plan view of the rock breaking device provided in embodiment 1 of the present application, which is mounted on an excavator body;

fig. 3 is a schematic structural view of a counterweight provided in embodiment 1 of the present invention;

fig. 4 is a top view of a rock breaking device provided in other embodiments of the present invention;

fig. 5 is an exploded view of the connecting shaft part of the rock breaking device provided in embodiment 1 of the utility model;

FIG. 6 is a schematic structural diagram of a rock breaking device with a connecting piece, which is provided by the embodiment of the utility model and is mounted on an excavator body;

fig. 7 is an exploded view of the connector and counterweight of fig. 5.

Icon: 201-a first hinge; 202-a second hinge; 203-a third hinge; 204-a fourth hinge; 205-a fifth hinge; 206-a sixth hinge; 2010-counterweight through holes; 3-big arm; 4-forearm; 5-a rock breaker; 6-a first link; 7-a second link; 8-counterweight; 81-counterweight body; 811-medial side; 82-a guide groove; 83-a fixation hole; 181-an insertion end; 821-groove bottom; 822-a slot wall; 823-opening; 9-a small arm oil cylinder; 10-a rock breaker cylinder; 122-a guide assembly; 15-a connecting shaft; 151-a limit stop; 152-connecting shaft gasket; 16-a sleeve; 17-a guide rail; 18-a connector; 19-a holder.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings.

It is to be understood that the terminology indicating the orientation or positional relationship is based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and for the simplicity of description, and is not intended to indicate or imply that the apparatus or component in question must have a particular orientation, be constructed and operated in a particular orientation, and is not to be taken as limiting the present invention.

Referring to fig. 1, the counterweight 8 is positioned in front of the boom 3, the counterweight 8 is positioned above the first link 6, and the excavator upper body is rotated in a direction transverse to the lower body.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Example 1:

referring to fig. 1 and 2, the present embodiment provides a rock breaking device and a rock breaking construction machine. The rock breaking construction machine comprises a rock breaking device and an excavator body. The excavator body comprises an upper body and a lower body, and the upper body is rotatably arranged on the lower body.

The rock breaking device comprises a large arm 3, a small arm 4, a rock breaker 5, a first connecting rod 6, a second connecting rod 7 and a rock breaker oil cylinder 10; one end of the large arm 3 is hinged with the upper vehicle body, and the lower part of the large arm 3 is hinged with the upper vehicle body through a large arm 3 oil cylinder; the middle part of the small arm 4 is hinged with the end part of the large arm 3, and the upper part of the large arm 3 is hinged with the upper end of the small arm 4 through a small arm oil cylinder 9. The rock breaker 5 is hinged with the lower end of the small arm 4 and the first connecting rod 6 at the same time, one end of the second connecting rod 7 is hinged with the small arm 4, and the other end of the second connecting rod is hinged with the first connecting rod 6; the small arm 4, the rock breaker 5, the first connecting rod 6 and the second connecting rod 7 form a four-bar structure; one end of the rock breaker oil cylinder 10 is hinged with the small arm 4, and the other end is hinged with the first connecting rod 6 or the second connecting rod 7.

Further, referring to fig. 2 and 3, the rock breaking device further includes two counterweights 8; the two balance weights 8 are respectively positioned at two sides of the small arm 4 and are symmetrically arranged. The counterweight 8 comprises a massive counterweight body 81, and the lower end of the counterweight body 81 is hinged with the first connecting rod 6 through a counterweight 8 hinging shaft. The inner side surface of the weight body 81 (i.e., the side surface opposite to the side plate of the arm 4) is provided with a bar-shaped guide groove 82, and two side surfaces of the arm 4 are respectively provided with a guide assembly 122. When the breaker oil cylinder stretches, the counterweight 8 can move relative to the small arm 4, and at the moment, the counterweight 8 can be in rolling fit with the corresponding guide assembly 122 through the guide groove 82 of the counterweight 8; that is, with the counterweight 8 as a reference, the guide member 122 can move along the guide groove 82. The guide groove 82 and the guide member 122 are provided to allow the upper portion of the balance weight 8 to move along a predetermined trajectory, preventing interference with other components.

Specifically, the guide groove 82 extends along the length direction of the weight body 81 and includes a groove bottom 821 and two groove walls 822 disposed opposite to each other, wherein the groove bottom 821 is substantially parallel to the inner side surface 811, and the groove walls 822 are substantially perpendicular to the inner side surface 811. Two guide rails 17 are also disposed in the guide groove 82, and the guide rails 17 are disposed on the groove wall 822. Referring to fig. 3, the guide rail 17 has a long bar shape that can restrict the front-rear position of the counterweight 8 with respect to the small arm 4, but cannot restrict the lateral position of the counterweight 8 with respect to the small arm 4. In this case, it is necessary to add a lateral limiting device (not shown in the drawings) for limiting the lateral position of the counterweight 8; the transverse limiting device can be a strip-shaped baffle arranged at the edge of the guide rail 17. Counterweight 8 cooperates with a corresponding guide assembly 122 through guide rail 17, limiting the fore-and-aft and lateral distances of counterweight 8 with respect to small arm 4; which can significantly reduce friction.

In other embodiments, the cross-sectional shape of the guide rail 17 may be circular or polygonal, and the front-rear and lateral distances of the counterweight 8 with respect to the small arm 4 may be limited; the guide wheel is provided with a matching surface which is matched with the shape of the guide rail 17. For example, when the guide rail has a circular cross section, the circumferential surface of the guide wheel is provided with a groove having a very curved cross section, thereby forming a mating surface.

And if directly install guide rail 17 in counter weight 8 on the medial surface of counter weight body 81, guide rail 17 can occupy the width space between counter weight body 81 and forearm 4 to make two counter weight body 81's total width bigger, and then can reduce the flexibility of broken rock device when slope operation and slot operation. Further, since the guide rail 17 itself is long, if the guide rail 17 is directly provided on the inner side surface of the weight body 81, the guide rail 17 easily interferes with the hydraulic line. Therefore, the guide groove 82 is formed in the inner side surface of the counterweight body 81 in a sunken mode, so that the total width of the two counterweights 8 is reduced under the condition that the counterweights 8 are prevented from interfering with a pipeline, and the operation flexibility of the rock breaking device is improved. In addition, the guide rail 17 is arranged on the groove wall 822 of the guide groove 82, so that the bearing capacity of the guide rail 17 is larger and the guide rail is not easy to deform.

Further, in order to prevent the guide wheel of the guide assembly from falling out of the guide groove, a transverse limiting device (not shown in the attached drawings) needs to be arranged on the guide rail; and, in order to facilitate the assembly of the balance weight 8 with the guide member, the lower end (with reference to the drawing) of the guide groove 82 is provided with an opening 823 through which the guide member 122 can pass. After the opening 823 is formed at the lower end of the guide groove 82, when the counterweight 8 is mounted, the rolling device on the guide assembly 122 is inserted between the two guide rails 17 provided in the guide groove 82 through the opening 823 from above by the counterweight 8 without separately mounting and dismounting the rolling device. When the counterweight 8 is removed, the counterweight 8 is lifted from bottom to top, the rolling device is moved out of the guide groove 82 from the opening 823, and the rolling device does not need to be disassembled and assembled. Therefore, the above design improves the convenience of attaching and detaching the counterweight 8.

Referring to fig. 5, to increase the flexibility of the breaker, the lower portion of the counterweight 8 is generally hinged to the upper end of the first link 6. This also makes broken rock device during operation, and counter weight 8 is whole to shake easily, has certain potential safety hazard. In order to reduce the shaking and the potential safety hazard, a counterweight through hole 2010 is further formed in the upper portion of the counterweight body 81, and the two counterweight bodies 81 are connected through a connecting shaft 15 arranged in the counterweight through hole 2010.

Specifically, counterweight through holes 2010 are provided at positions forward of the upper ends of the two counterweights 8, and the connecting shaft 15 passes through the counterweight through holes 2010 of the two counterweights 8. The diameter of the connecting shaft 15 is slightly smaller than that of the counterweight through hole 2010 so that the connecting shaft 15 can freely rotate in the counterweight through hole 2010. If the connecting shaft 15 cannot move in the counterweight through hole 2010, it causes the two counterweights 8 to be rigidly connected together. At this time, due to accumulation of machining errors and assembly errors, it may cause contact conditions of the counterweights 8 on both sides and the corresponding guide assemblies 12 to be inconsistent; that is, the guide assemblies 12 on both sides are unevenly stressed, making the more stressed side more vulnerable. After a certain gap is formed between the outer wall of the connecting shaft 15 and the inner wall of the counterweight through hole 2010, the gap provides a certain allowance for the relative movement between the two counterweights 8; the above-mentioned allowance enables a good fit of the counterweights 8 on both sides with the corresponding guide assemblies 12. In other embodiments, the cross-section of the connecting shaft 15 and the counterweight through hole 2010 may be polygonal, elliptical or other irregular shapes.

In addition, both ends of the connecting shaft 15 are respectively provided with a limiting piece 151; the stopper 151 can restrict the axial movement of the connecting shaft 15, so that the connecting shaft 15 can be prevented from falling off; in addition, the movement of the two weights 8 in the direction away from each other can be restricted, and the shake of the weights 8 can be reduced. The limiting member 151 may be a nut or a bolt.

Further, a sleeve 16 is sleeved on the connecting shaft 15 and located between the two sleeves 16. The sleeve 16 can limit the distance between the counterweights 8, prevent the two counterweights 8 from moving towards the direction of approaching each other, and improve the overall stability of the rock breaking device. A gasket is arranged between the end part of the sleeve 16 and the adjacent counterweight 8 and sleeved on the connecting shaft 15; the distance between the two weights 8 can be adjusted by adjusting the thickness or the number of shims.

The guide assembly 122 in this embodiment employs a guide wheel rotatably mounted on the side of the small arm 4.

It should be noted that, in other embodiments, the guide rail 17 may not be disposed in the guide groove 82, and in this case, the guide assembly 122 is directly disposed in the guide groove 82, and the groove wall 822 of the guide groove 82 is used to cooperate with the guide assembly 122.

Example 2:

the present embodiment provides another rock breaking device, which is different from embodiment 1 in that a connecting shaft 15 is not provided between two counterweights 8, and counterweight through holes 2010 are not provided in the counterweights 8; but a connecting member 18 is provided between the two counter weights 8.

Specifically, referring to fig. 6 and 7, a connecting member 18 is provided between the weights 8 located on both sides of the small arm 4, and the two weights 8 are movably connected by the connecting member 18. The connecting member 18 has insertion ends 181 at both ends thereof, and the insertion ends 181 extend in a direction parallel or substantially parallel to the inner side surface 811. The counterweight 8 is provided with a fixing hole 83, the axis of the fixing hole 83 is parallel or substantially parallel to the inner surface 811, the insertion end 181 is inserted into the fixing hole 83, and the insertion end 181 is fixed to the fixing hole 83 by the anchor 19.

In this embodiment, the inner surface 811 is provided with a connecting plate, and the fixing hole 83 is provided in the connecting plate. In other embodiments, the fixing hole 83 may be designed according to actual needs, and may be provided on the upper end surface of the weight body, for example.

The fastener 19 is a pin shaft with a pin, and in other embodiments, may be other fastening devices such as a bolt and a snap.

As shown in the drawing, the inner surface 811 is a surface of the weight body 81 facing the forearm.

The insertion end 181 is circular, and the axis thereof is parallel to the front end face of the counterweight body 81; in other embodiments, due to the variety of shapes of the weight body 81, the axis of the insertion end 181 may not be parallel to the front end surface of the weight body 81.

Regarding the shape of the insertion end 181, the shape of the insertion end 181 may be other shapes such as a square, a polygon, and the like.

When the insertion end 181 of the link 18 is inserted into the fixing hole 83, the lateral distance of the counterweight 8 on both sides of the arm 4 at this position can be limited, and the position can be rotated within a certain angle range about the sixth hinge 206. The design enables the guide assemblies 122 on the two sides of the small arm 4 to be easily and simultaneously contacted with the guide rails 17 in the corresponding guide grooves 82, so that the weights of the counterweights 8 on the two sides of the small arm 4 are respectively applied to the corresponding guide assemblies 122, and the service life of the guide assemblies 122 is prolonged.

Compared with the scheme provided by the embodiment 1, the scheme provided by the embodiment is more favorable for obtaining a larger rotation angle when the connecting piece rotates around the sixth hinge part, and further favorable for overcoming the problem that guide rails on two sides of the small arm are difficult to contact with the guide assembly at the same time due to manufacturing errors.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A counterweight is used for a rock breaking device and is characterized by comprising a counterweight body, wherein a guide groove is formed in the inner side surface of the counterweight body; the guide groove is strip-shaped and comprises a groove bottom and two groove walls which are oppositely arranged; the two groove walls are used for being matched with the guide component on the small arm.

2. The counterweight according to claim 1 further comprising two guide rails disposed within the guide grooves and connected to the two groove walls, respectively; the two guide plates extend along the length direction of the guide groove.

3. The counterweight according to any one of claims 1 or 2 wherein the guide recess is provided at a lower end thereof with an opening through which the guide member can pass.

4. A counterweight according to claim 1 in which the lower end of the counterweight is provided with a hinge.

5. A rock breaking device, characterized in that the rock breaking device comprises a small arm, a rock breaker cylinder and two counterweights according to any one of claims 1-4;

the rock breaker is hinged with the lower end of the small arm, one end of the rock breaker oil cylinder is connected with the small arm, and the other end of the rock breaker oil cylinder is directly or indirectly connected with the rock breaker;

the rock breaking device further comprises two guide assemblies, and the balance weights are respectively located on two sides of the small arm; the counterweight is hinged with the rock breaker; or the counterweight is hinged with an intermediate connecting piece, and the intermediate connecting piece is hinged with the rock breaker;

the two guide assemblies are respectively arranged on two side faces of the small arm, guide grooves are formed in the two balance weights, and when the balance weights move relative to the small arm, the balance weights are in sliding fit or rolling fit with the corresponding guide assemblies through the guide grooves of the balance weights.

6. A rock breaking device according to claim 5, wherein the intermediate connection comprises a first link and a second link; the rock breaker is hinged with the lower end of the small arm and the first connecting rod at the same time, one end of the second connecting rod is hinged with the small arm, and the other end of the second connecting rod is hinged with the first connecting rod; one end of the rock breaker oil cylinder is hinged with the small arm, and the other end of the rock breaker oil cylinder is hinged with the first connecting rod or the second connecting rod.

7. The rock breaking device of claim 5, further comprising a connecting piece, wherein two ends of the connecting piece are movably connected with the two counterweights respectively.

8. The rock breaking device of claim 7, wherein two ends of the connecting piece are respectively provided with an insertion end, and the insertion ends are parallel or approximately parallel to the inner side surface of the balance weight; the counterweight is provided with a fixing hole; the inserting ends are inserted in the corresponding fixing holes.

9. A rock breaking construction machine, characterized in that the rock breaking construction machine comprises an excavator body and a rock breaking device according to any one of claims 5-8, wherein the excavator body is connected with a small arm of the rock breaking device.

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