CN212791210U - Return material extension system for impact crusher - Google Patents

Abstract

The utility model belongs to the technical field of the rubbing crusher, concretely relates to reaction crusher is with returning charge extension system. The utility model comprises a tail end expansion device which is arranged at the tail end of the return material conveying frame and has the expansion function and a head end lifting device which is arranged at the head end of the return material conveying frame and has the lifting function; the head end lifting device comprises a four-connecting-rod jacking assembly and a head support assembly used for connecting the four-connecting-rod jacking assembly with the material returning conveying frame; the tail end telescopic device comprises a telescopic cylinder fixed at the position of the vehicle body and a tail support assembly used for connecting the telescopic cylinder with the material returning conveying frame. The utility model discloses can realize returning charge carriage's receipts on line and fold and lifting function to effectively promote the efficiency nature of the transportation operation of impact crusher.

Description

Return material extension system for impact crusher

Technical Field

The utility model belongs to the technical field of the rubbing crusher, concretely relates to reaction crusher is with returning charge extension system.

Background

The impact crusher is called as impact crusher for short, and is mainly used for processing materials which often need to be moved in metallurgy, chemical industry, building materials, water and electricity and the like, in particular for pre-crushing of flowable stones in expressways, railways, water and electricity engineering and the like. When the impact crusher works specifically, firstly, materials are conveyed to a feeding machine from a feeding hopper, then the materials are conveyed to impact crushing through the vibration of the feeding machine, the crushed materials fall to a conveyor, the conveyor conveys the materials to a material returning screen, and the material returning screen separates finished products from unfinished products through vibration; and the unfinished material falls into a transition conveyor, the transition conveyor conveys the material to a material returning conveying frame, the material is returned to the impact crusher for secondary material returning processing, and the finished product is discharged from a discharge port. The traditional material returning conveying frame is of an integral structure and is influenced by the height of material returning, and the material frame is normally ultrahigh and overlong; however, the ultra-high and ultra-long material returning conveying frame obviously causes the increase of the whole size of the impact crusher, and the transportation operation is very inconvenient. When the impact crusher is transported at present, the return material conveying frame needs to be integrally disassembled, namely, the return material conveying frame and the impact crusher are transported separately; after the impact crusher is transported to an operation place, the return material conveying frame is reassembled, obviously, the operation is very complicated, and the transportation efficiency is extremely low, so that a lot of troubles are brought to the actual use of the impact crusher.

Disclosure of Invention

The utility model aims at overcoming above-mentioned prior art not enough, providing a rational in infrastructure and practical reaction crusher is with returning charge extension system, it can realize the online receipts of returning charge carriage and fold and lifting function to effectively promote the efficiency nature of reaction crusher's transportation operation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a return charge extends system for impact crusher which characterized in that: the system comprises a tail end telescopic device which is arranged at the tail end of the material returning conveying frame and has a telescopic function; and a head end lifting device with a lifting function and positioned at the head end of the material returning conveying frame, wherein:

the head end lifting device comprises a four-connecting-rod jacking assembly and a head support assembly used for connecting the four-connecting-rod jacking assembly with the material returning conveying frame; the four-connecting-rod jacking assembly comprises a first connecting rod fixed at the position of the vehicle body, the top end of the first connecting rod is hinged with the head end of an L-shaped second connecting rod, the tail end of the second connecting rod is hinged with the head end of a 7-shaped third connecting rod, the tail end of the third connecting rod is hinged with the head end of a V-shaped fourth connecting rod, the tail end of the fourth connecting rod is hinged with the first connecting rod, all hinged positions are horizontally arranged, and therefore a four-connecting-rod structure is formed on the vertical plane; when the four-connecting-rod structure is in an initial state, the head end vertical rod section of the second connecting rod and the tail end vertical rod section of the fourth connecting rod are vertically attached to each other, and the upper surface of the tail end transverse rod section of the second connecting rod and the upper surface of the head end transverse rod section of the third connecting rod are positioned on the same horizontal plane, so that a placing surface for placing the head support assembly is formed; the four-connecting-rod jacking assembly further comprises a power cylinder for driving the four-connecting-rod structure to form an initial state and an extension state, the cylinder wall of the power cylinder is hinged to the vehicle body, and the piston rod end of the power cylinder extends upwards in an inclined mode and is hinged to the rod body of the tail end vertical rod section of the fourth connecting rod; the first support assembly comprises a first support roller with a roller shaft perpendicular to the material conveying direction of the material returning conveying frame, and the roller surface of the first support roller is hinged to the upper surface of a first end cross rod section of the third connecting rod through a first end hinge seat vertically arranged on a hinge axis; a head end bracket extends downwards at the position of the material returning conveying frame; two ends of the head end bracket extend to two ends of the head carrier roller and form a rotation fit relation with the head carrier roller, and the rotation axis of the head end bracket is horizontal;

the tail end telescopic device comprises a telescopic cylinder fixed at the vehicle body and a tail support assembly used for connecting the telescopic cylinder with the return conveying frame; the tail support assembly comprises a tail support roller, the roller length direction of the tail support roller is perpendicular to the material conveying direction of the material returning conveying frame, and the roller surface of the tail support roller is matched on the material returning conveying frame in a rotating mode through a tail end hinge seat, the hinge axis of which is vertically arranged; the piston rod end of the telescopic cylinder horizontally extends to the tail end of the material returning conveying frame and is fixedly connected with the tail end support; two ends of the tail end bracket extend to two ends of the tail carrier roller and form a rotation fit relation with the tail carrier roller, and the rotation axis of the tail end bracket is horizontal.

Preferably, a hinge joint of the second connecting rod and the third connecting rod is a first hinge joint, a hinge joint of the third connecting rod and the fourth connecting rod is a second hinge joint, and when the four-bar linkage structure is in an initial state, in a projection in a top view direction, the second hinge joint is located on a connecting line between the first hinge joint and the first-end hinge seat.

Preferably, a V-shaped angle formed by the fourth link shaft is an obtuse angle; when the four-bar linkage is in an extension state, the tail end vertical bar section of the second connecting bar and the tail end inclined bar section of the third connecting bar are attached in parallel.

Preferably, the tail end of the fourth connecting rod is hinged to the middle rod body of the first connecting rod, and the bottom end of the first connecting rod forms a hinged end for the cylinder wall end of the power cylinder to be hinged.

Preferably, the head end support is located below the head end of the material returning conveying frame, and the tail end support is arranged above the tail end of the material returning conveying frame in a portal frame shape.

Preferably, the power cylinder and the telescopic cylinder are hydraulic cylinders.

The beneficial effects of the utility model reside in that:

1) the utility model discloses a head end lifting devices and tail end telescoping device are arranged respectively to head end and tail end at the returning charge carriage to utilize "lift on to one side the extension mode of + tail water flat top", realized returning charge carriage and hugged closely the automobile body by the little inclination when transporting, changed into the action purpose that the automobile body was kept away from to the big inclination of normal during operation.

Particularly, to head end lifting devices, the utility model discloses the construction improvement to traditional four-bar linkage structure goes on: on the one hand, the tail end transverse rod section of the first connecting rod and the tail end transverse rod section of the second connecting rod form the same horizontal line, so that the head support assembly is provided to lay a platform, and the reliable force bearing effect on the material returning conveying frame is guaranteed while the normal extending action path of the material returning conveying frame is not influenced. On the other hand, the head end vertical rod section of the second connecting rod and the tail end vertical rod section of the fourth connecting rod are attached in parallel, so that the acting stroke of the power cylinder tends to be minimized while the force bearing performance and the structural compactness are ensured. Through the cooperation, during actual work, the power cylinder only needs to slightly apply force to the tail end vertical rod section, namely the whole four-bar linkage structure generates large-amplitude lifting and unfolding actions, the working sensitivity and the reliability are extremely high, and the on-line folding and lifting actions of the return conveying frame are obvious. And for the tail end telescoping device, every time the head end lifting device generates an outward and upward oblique jacking action, so that when the head end of the return conveying frame is gradually far away from the vehicle body, the tail end telescoping device can also move along with the head end lifting device, and the tail end of the pushing return conveying frame synchronously generates a motion of being far away from the vehicle body, so that the work coordination is extremely high.

Furthermore, it is worth noting that the height of the tail end of the return material conveyor is not usually adjusted due to the particularity of the return material conveyor. The tail end of the return material conveying frame only performs horizontal outward pushing-away action through the tail end telescopic device which horizontally pushes, so that the return material conveying frame is guaranteed to always have an action datum point, namely a tail end point, in the whole action process; therefore, no matter how the head end of the material returning conveying frame swings and rises, the final position of the whole material returning conveying frame is always determined. When the impact crusher arrives at an operation place, the return material conveying frame can be quickly stretched by means of the action datum point, and the self-stretching and self-calibration functions are realized, so that the field calibration process is omitted, and the requirements of fast-paced and high-efficiency construction site production at present are obviously met.

Through the cooperation structure, the utility model discloses can realize returning charge conveyer's receipts on line and fold and lifting function to effectively promote the efficiency nature of the transportation operation of impact crusher.

2) And for the head support assembly, the function of the head support assembly is to provide the motion compensation amount of the return material conveying frame during folding and lifting, so that the situation that the return material conveying frame is blocked due to assembly errors or the matching state of the return material conveying frame and other accessory components is avoided. The head support assembly comprises an X-direction rotation system formed by a head support roller matched with a head end hinge seat vertically arranged on a hinge axis and a Y-direction rotation system formed by a head support roller matched with a head end support, so that the action compensation effect is flexibly played.

3) The arrangement position of the second hinge point, namely the hinge joint of the third connecting rod and the fourth connecting rod, is provided with the teaching. In the projection of the overlooking direction, the second hinge point is positioned on a connecting line between the first hinge point and the first-end hinge seat, so that the huge mass of the material returning conveying frame can be reliably borne by the third connecting rod and the fourth connecting rod when the material returning conveying frame is placed on the placing surface in the initial state, and the working stability and the reliable force bearing effect of the overall structure are ensured while the compactness of the structure is ensured.

4) When the four-connecting-rod structure is in a fully-extended state, the material returning conveying frame is in a high-lift angle state, and at the moment, on one hand, a concave space formed by the unique 7-shaped structure of the third connecting rod plays a role in accommodating the L-shaped corner of the second connecting rod, and the compactness of the structure is ensured. On the other hand, the tail end vertical pole section of second connecting rod and the tail end slope pole section of third connecting rod are parallel laminating each other to when four-bar linkage structure extends completely, the second connecting rod has formed the cooperation state of similar dead point with the third connecting rod, and then has ensured the utility model discloses still can reliable steady operation under the huge jolt power of returning charge carriage self huge weight and during operation, the practicality is extremely strong.

5) And for the first connecting rod, the first connecting rod can be completely and directly fused on the vehicle body. The utility model discloses with first connecting rod downwardly extending to when cooperation second connecting rod and fourth connecting rod, played the function of the fixed base member of relative power cylinder again, realized the independency of overall structure. During actual assembly, the utility model discloses but the independent design preparation, the direct relative automobile body in later stage weld assembly can. Even to current counterattack breaker, because the utility model discloses an independent installation characteristic obviously also can directly carry out the on-the-spot renewal to current counterattack breaker, need not to purchase new money, and the renewal cost can be showing and is reducing, also more does benefit to and is accepted by manufacturing enterprise.

6) The head end support is positioned below the head end of the material returning conveying frame, so that the phenomenon of overhigh equipment height caused by arrangement above the material returning conveying frame can be avoided; similarly, the tail end bracket is arranged above the tail end of the return material conveying frame in a portal frame shape, because the tail end of the return material conveying frame approaches the ground surface, the tail end bracket needs to be arranged above the tail end of the return material conveying frame to ensure the use function of the return material conveying frame.

Drawings

FIG. 1 is a schematic view of an installation position of a four-bar jacking assembly in an initial state;

FIG. 2 is an elevation view of the four-bar jacking assembly in an initial state;

FIG. 3 is a perspective view of FIG. 2;

FIG. 4 is a front view of the trailing expansion device in an expanded state;

FIG. 5 is a perspective view of FIG. 4;

FIG. 6 is an elevation view of the four-bar jacking assembly beginning to produce an extending action;

FIG. 7 is a perspective view of FIG. 6;

FIG. 8 is a front view of the four-bar jacking assembly fully extended;

FIG. 9 is a perspective view of FIG. 8;

FIG. 10 is a schematic view of the four-bar jacking assembly in an extended position.

The utility model discloses each reference numeral is as follows with the actual corresponding relation of part name:

a-material returning conveying frame

10-head end lifting device 11-four-bar jacking assembly

11 a-first link 11 b-second link 11 c-third link 11 d-fourth link

111-head end lifter segment 112-tail end lifter segment 113-tail end lifter segment

114-head end crossbar segment 115-tail end oblique rod segment

12-head support assembly

12 a-first carrier roller 12a 12 b-head end hinging seat 12b 12 c-head end support 12c

13-power cylinder

20-tail end expansion device 21-expansion cylinder 22-tail support assembly

22 a-tail carrier roller 22 b-tail end hinged seat 22 c-tail end support

Detailed Description

For the purposes of understanding, the specific structure and operation of the invention is set forth in the following description in connection with the accompanying drawings:

the specific structure of the present invention is shown in fig. 1-10, and its main components include two parts, a head end lifting device 10 and a tail end telescoping device 20, wherein:

head end lifting device 10

The head end lifting device 10 is arranged at the head end of the material returning conveying frame a, and has the function of lifting the material returning conveying frame to obliquely lift upwards, and the timely retraction and reset effect can be realized. The specific arrangement positions are shown in fig. 1-10.

The head end lifting device 10 is composed of a four-bar linkage lifting assembly 11 and a head support assembly 12. The four-bar jacking assembly 11 is based on a modified configuration of a conventional four-bar linkage, and includes a first link 11a fixed to a vehicle body. The top end of the first connecting rod 11a is hinged with the head end of an L-shaped second connecting rod 11b, the tail end of the second connecting rod 11b is hinged with the head end of a 7-shaped third connecting rod 11c, the tail end of the third connecting rod 11c is hinged with the head end of a V-shaped fourth connecting rod 11d, the tail end of the fourth connecting rod 11d is hinged at the middle section of the first connecting rod 11a, all hinged parts are horizontally arranged, and therefore a four-connecting-rod structure is formed on the vertical plane, and the four-connecting-rod structure is shown in specific reference to FIGS. 2-3.

When the four-bar linkage configuration is in the initial state as shown in fig. 2-5, the head end side rail segment 111 of the second link 11b and the tail end side rail segment 112 of the fourth link 11d vertically abut against each other, and the upper surface of the tail end side rail segment 113 of the second link 11b and the upper surface of the head end side rail segment 114 of the third link 11c are at the same level, thereby forming a resting surface on which the head support assembly 12 can rest. Meanwhile, the hinge joint of the second connecting rod 11b and the third connecting rod 11c is a first hinge joint, the hinge joint of the third connecting rod 11c and the fourth connecting rod 11d is a second hinge joint, and when the four-bar linkage structure is in an initial state, in a projection in a top view direction, the second hinge joint is located on a connecting line between the first hinge joint and the first-end hinge seat 12 b. When the four-bar linkage is in the extended state as shown in fig. 8-10, the first end vertical bar segment 111 of the second link 11b and the tail end inclined bar segment 115 of the third link 11c are attached in parallel to each other to ensure the strength and the compactness.

On the basis of the above structure, the four-bar jacking assembly 11 further comprises a power cylinder 13 for driving the four-bar structure to form the initial state and the extended state. The power cylinder 13 is a hydraulic cylinder to ensure a large thrust to the four-bar linkage configuration. The cylinder wall of the power cylinder 13 is hinged at the vehicle body, and the piston rod end of the power cylinder 13 extends obliquely upward and is hinged at the tail end vertical rod section 112 of the fourth connecting rod 11 d.

In practice, the head support assembly 12 can be seen as an X-axis swing mechanism formed by the head support roller 12a and the head end hinge seat 12b and a Y-axis swing mechanism formed by the head support roller 12a and the head end support 12c, centering on the head support roller 12a, so that the return material conveying rack a can be always kept in a stable posture during the initial and extending actions of the four-bar jacking assembly 11.

Tail end telescoping device 20

The specific structure of the tail end telescopic device 20 is shown in fig. 3 and 5, and it includes a telescopic cylinder 21 fixed at the vehicle body and a tail stock assembly 22 for connecting the telescopic cylinder 21 and the return material conveying rack a.

The tail stock assembly 22 is constructed similarly to the head stock assembly 12, that is, with the tail stock roller 22a as the center, an X-axis swing mechanism formed by the tail stock roller 22a and the tail end hinge seat 22b and a Y-axis swing mechanism formed by the tail stock roller 22a and the tail end bracket 22c, so that the return material conveying rack a can be always kept in a stable posture during the initial and extending actions of the four-bar jacking assembly 11. The difference is that the head end support 12c needs to be arranged below the head end of the return material conveyor a, while the tail end support 22c needs to be arranged above the tail end of the return material conveyor a, as shown in fig. 3.

The head end hinge base 12b and the tail end hinge base 22b are both through hinge columns, and thus, both penetrate the corresponding roller bodies and are exposed at the upper surfaces of the roller bodies in fig. 3. In actual operation, each hinge seat may also be designed as a hinge structure such as a conventional hinge lug, and will not be described herein.

For ease of understanding, the specific workflow of the present invention is described herein below in conjunction with fig. 1-10:

1) and use the utility model discloses a counterattack is broken when being in the transport state as shown in fig. 1, can see this moment, and tail end telescoping device 20 department telescoping cylinder 21 is in the return stroke state completely for on the elevation shown in fig. 2, whole returning charge carriage an is in the state of putting right of laminating the automobile body completely. The four-bar jacking assembly 11 at the head end lifting assembly is in an initial state, and at this time, the head end vertical bar segment 111 of the second connecting bar 11b and the head end horizontal bar segment 114 of the third connecting bar 11c are matched with each other to form a resting surface for the head end of the head support assembly 12 and even the whole return material conveying rack a to rest. Because the laying surface forms a plane structure, the transportation stability of the returned material conveying rack a cannot be influenced even under the bumping force during transportation.

2) When the operation place is reached to the broken fortune of counterattack, the utility model discloses carry out following action:

a. the tail end telescopic device 20 starts to act, the telescopic cylinder 21 lifts, and the tail end of the return material conveying frame a is pushed to move away from the vehicle body, and the operation is specifically shown in fig. 4-5.

b. When the tail end of the return material conveying frame a reaches a designated position, the head end lifting device 10 starts to act:

first, the power cylinder 13 is actuated to push the fourth link 11d to move obliquely upward around the first link 11a, so that the whole four-link structure follows up and gradually becomes the state shown in fig. 6-7. Thereafter, the power cylinder 13 continues to lift until the "L" shaped corner of the second link 11b is caught in the concave space formed by the unique "7" configuration of the third link 11c, and at the same time, the head end vertical rod segment 111 of the second link 11b and the tail end inclined rod segment 115 of the third link 11c are attached in parallel to each other to form an action dead point. Finally, the head end lifting device 10 is brought into the fully deployed state as shown in fig. 8-9.

When the anti-impact breaking reaches the operation site, the whole action flow is summarized as follows: the tail end expansion device 20 pushes the tail end of the return material conveying frame a to be away from the impact car body to be in place, and the head end lifting device 10 lifts the head end of the return material conveying frame a upwards in an inclined mode to move around the tail end of the return material conveying frame a until the head end of the return material conveying frame a moves in place. At this time, the overall operation state of the return carrier a is shown in fig. 10. In the situation of fig. 10, the impact breaker or impact crusher can be operated normally. And when the counterattack is finished and the operation site needs to be moved, the steps are operated in the reverse direction. Obviously, in the whole operation process, the material returning conveying frame a is assembled at the position of the impact-resistant broken vehicle body and is not independently disassembled, so that the operation is more flexible and convenient, and the effect is more remarkable in the moving operation of multiple operation places.

Of course, the above is one specific embodiment of the present invention. In actual operation, to the equivalent replacement as the power supply, if with power cylinder 13 and telescopic cylinder 21 adaptability change other power components etc. to do the shape fine setting that does not influence self working property to the structure of each connecting rod that constitutes four-bar linkage structure, with head support assembly 12 and the corresponding roll body of tail support assembly 22 department transform to cylindrical, prism shape or even curved bar shape etc. this type is known the utility model discloses the conventional structural change of doing on the structural basis all should be regarded as equivalent or similar design and fall into the protection scope of the utility model.

Claims (6)

1. The utility model provides a return charge extends system for impact crusher which characterized in that: the system comprises a tail end telescopic device (20) which is arranged at the tail end of the material returning and conveying frame and has a telescopic function; and a head end lifting device (10) positioned at the head end of the return material conveying frame and used for lifting, wherein:

the head end lifting device (10) comprises a four-connecting-rod jacking assembly (11) and a head support assembly (12) used for connecting the four-connecting-rod jacking assembly (11) with the return conveying frame; the four-connecting-rod jacking assembly (11) comprises a first connecting rod (11a) fixed at the position of a vehicle body, the top end of the first connecting rod (11a) is hinged with the head end of an L-shaped second connecting rod (11b), the tail end of the second connecting rod (11b) is hinged with the head end of a 7-shaped third connecting rod (11c), the tail end of the third connecting rod (11c) is hinged with the head end of a V-shaped fourth connecting rod (11d), the tail end of the fourth connecting rod (11d) is hinged with the first connecting rod (11a), and all hinged parts are horizontally arranged, so that a four-connecting-rod structure is formed on a vertical plane; when the four-bar linkage structure is in an initial state, a head end vertical rod section (111) of the second connecting rod (11b) and a tail end vertical rod section (112) of the fourth connecting rod (11d) are vertically attached to each other, and the upper surface of a tail end transverse rod section (113) of the second connecting rod (11b) and the upper surface of a head end transverse rod section (114) of the third connecting rod (11c) are on the same horizontal plane, so that a placement surface for placing the head support assembly (12) is formed; the four-connecting-rod jacking assembly (11) further comprises a power cylinder (13) for driving the four-connecting-rod structure to form an initial state and an extension state, the cylinder wall of the power cylinder (13) is hinged to a vehicle body, and the piston rod end of the power cylinder (13) extends upwards in an inclined mode and is hinged to the rod body of a tail end vertical rod section (112) of the fourth connecting rod (11 d); the head support assembly (12) comprises a head carrier roller (12a) with a roller shaft perpendicular to the material conveying direction of the return conveying frame, and the roller surface of the head carrier roller (12a) is hinged to the upper surface of a head end transverse rod section (114) of a third connecting rod (11c) through a head end hinge seat (12b) which is vertically arranged on a hinge axis; a head end bracket (12c) extends downwards at the material returning and conveying frame; two ends of the head end bracket (12c) extend to two ends of the head carrier roller (12a) and form a rotation fit relation with the head carrier roller, the rotation axis of which is a horizontal line;

the tail end telescopic device (20) comprises a telescopic cylinder (21) fixed at the vehicle body and a tail support assembly (22) used for connecting the telescopic cylinder (21) with the return conveying frame; the tail support assembly (22) comprises a tail carrier roller (22a) vertical to the conveying direction of the material returning conveying frame in the roller length direction, and the roller surface of the tail carrier roller (22a) is in rotating fit with the material returning conveying frame through a tail end hinge seat (22b) which is vertically arranged on a hinge axis; the piston rod end of the telescopic cylinder (21) horizontally extends to the tail end of the material returning conveying frame and is fixedly connected with the tail end bracket (22 c); two ends of the tail end bracket (22c) extend to two ends of the tail carrier roller (22a) and form a rotation fit relation with the tail carrier roller, wherein the rotation axis of the tail carrier roller is a horizontal line.

2. The return material extension system for an impact crusher of claim 1, wherein: when the four-bar linkage structure is in an initial state, the second hinge point is located on a connecting line between the first hinge point and the first-end hinge seat (12b) on the projection of the overlooking direction.

3. The return material extension system for an impact crusher of claim 2, wherein: the V-shaped angle formed by the rod body of the fourth connecting rod (11d) is an obtuse angle; when the four-bar linkage structure is in an extension state, the head end vertical bar section (111) of the second connecting bar (11b) and the tail end inclined bar section (115) of the third connecting bar (11c) are attached in parallel with each other.

4. A return material extension system for a impact crusher as claimed in claim 1, 2 or 3, wherein: the tail end of the fourth connecting rod (11d) is hinged to the middle rod body of the first connecting rod (11a), and the bottom end of the first connecting rod (11a) forms a hinged end for the cylinder wall end of the power cylinder (13) to be hinged.

5. A return material extension system for a impact crusher as claimed in claim 1, 2 or 3, wherein: the head end support (12c) is located below the head end of the material returning conveying frame, and the tail end support (22c) is arranged above the tail end of the material returning conveying frame in a portal frame shape.

6. A return material extension system for a impact crusher as claimed in claim 1, 2 or 3, wherein: the power cylinder (13) and the telescopic cylinder (21) are hydraulic cylinders.

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