Quick-change apparatus for engineering machinery and engineering machinery

Abstract

A quick-change apparatus for an engineering machinery has a main body having a front end and a rear end along a longitudinal direction, a locking pin movable along a longitudinal direction to releasably lock a rear pin shaft between an outer end of the locking pin and the rear end of the main body, a locking block pivotally arranged at the front end of the main body to shift between a released state and a locked state, and a driving mechanism located between the locking pin and the locking block and including a first driving mechanism and a second driving mechanism which move linearly in opposite directions along a longitudinal direction. The first driving mechanism is slidably connected with the locking block to drive the locking block to pivot, and the second driving mechanism is configured to drive the locking pin so as to be movable along the longitudinal direction.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of a quick-change apparatus for an engineering machinery, in particular to a quick-change apparatus for an engineering machinery.BACKGROUND

[0002] The quick-change apparatus for engineering machinery could realize the quick-change of the operation attachment, save the operation time and improve the operation efficiency. In order to improve the safety, the hydraulic cylinder is usually used in the quick-change apparatus for engineering machinery at present. The cylinder liner of the hydraulic cylinder is hinged with the cylinder block, and the piston rod is hinged with a releasable hook. The cylinder is almost directly subject to the vibration and impact generated when the connected operation attachment is in operation, with a poor reliability. The hydraulic cylinder moves reciprocally to drive the releasing and locking of the releasable hook. Once the hydraulic cylinder fails, the auxiliary parts might fall off, which results in that the operation attachment is damaged or discarded, and even leads to serious casualties.SUMMARY

[0003] For the above-described technical defects, the present disclosure provides a quick-change apparatus for an engineering machinery, for realizing the quick releasable locking between a main machine and an operation attachment, including: a main body having a front end and a rear end along a longitudinal direction thereof; a locking pin movably arranged at the rear end along the longitudinal direction to releasably lock a rear pin shaft for connecting with the operation attachment between an outer end of the locking pin and the rear end of the main body; a locking block pivotally arranged at the front end to shift between a released state in which a front pin shaft to be connected with the operation attachment is capable of entering and exiting between the locking block and the front end of the main body, and a locked state in which the front pin shaft is locked between the locking block and the front end of the main body; and a driving mechanism located between the locking pin and the locking block and including a first driving mechanism and a second driving mechanism which move linearly in opposite directions along the longitudinal direction, wherein the first driving mechanism is slidably connected with the locking block to drive the locking block to pivot so as to shift between a released state in which a front pin shaft is capable of entering and exiting between the locking block and the front end of the main body, and a locked state in which the front pin shaft is locked between the locking block and the front end of the main body, and the second driving mechanism is configured to drive the locking pin so as to be movable along the longitudinal direction.

[0004] In some embodiments, the locking block is provided with a pivot hole and a groove, a pivot shaft passes through the pivot hole and the two transverse sides of the main body, the locking block is pivotable about the pivot shaft in the main body, and a distal part of the first driving mechanism is slidable along the groove.

[0005] In some embodiments, the groove includes a linear segment remote from the pivot hole, and in the case that the locking block is in a locking state, the distal end of the first driving mechanism is located in the linear segment, and the linear segment is horizontal.

[0006] In some embodiments, the groove includes an arc segment adjacent to the pivot hole, and in the case that the locking block is in a released state, the distal end of the first driving mechanism is located in the arc segment.

[0007] In some embodiments, the distal end of the first driving mechanism slides along the arc segment, so that the locking block pivots.

[0008] In some embodiments, the quick-change apparatus includes a restoration elastic member between the main body and the locking block for biasing the locking block to pivot towards the front pin shaft.

[0009] In some embodiments, the main body includes a mounting seat with a mounting hole, the mounting seat is fixed in the main body, the distal part of the first driving mechanism is movably arranged in the mounting hole along a longitudinal direction, and the restoration elastic member is arranged between the mounting seat and the locking block.

[0010] In some embodiments, the distal part of the first driving mechanism includes a transverse push rod and a longitudinal push rod connected with the transverse push rod, the transverse push rod is slidably arranged in the groove, the longitudinal push rod is longitudinally movable along the mounting hole, and the restoration elastic member is sleeved on the longitudinal push rod, with both ends abutting against the mounting seat and the transverse push rod respectively, for biasing the transverse push rod to drive the locking block to pivot towards the front pin shaft.

[0011] In some embodiments, the main body includes: an upper coupling configured to releasably fastened to the main machine, wherein the driving mechanism is slidably arranged on the upper coupling; and a lower coupling configured to releasably fastened to the operation attachment.

[0012] In some embodiments, the upper coupling includes a front connecting pin shaft located at the front end and a rear connecting pin shaft located at the rear end, which are configured to be releasably fastened to the main machine respectively; or the front pin shaft and the rear pin shaft are arranged at the front end and the rear end of the lower coupling respectively, which are configured to be releasably fastened to the operation attachment respectively.

[0013] In some embodiments, each of the two transverse sides of the upper coupling is provided with one elongated slot, each of the two transverse sides of the first driving mechanism is provided with a stop pin respectively, and the two stop pins are slidable along the two elongated slots respectively to limit a longitudinal movement range of the first driving mechanism.

[0014] In some embodiments, the driving mechanism includes a two-way cylinder with a first cylinder and a second cylinder, the distal part of the first driving mechanism is drivingly connected with the first cylinder, the locking pin is drivingly connected with the second cylinder, and the two-way cylinder is, for example, H-shaped.

[0015] In some embodiments, the locking block includes a transverse connecting portion and two hook portions transversely arranged at intervals and connected by the transverse connecting portion, and an arc recess is formed on the top surface of the hook portion, each hook portion is provided with a pivot hole and a groove, and a distal part of the first driving mechanism is slidable along the two grooves between the two hook portions.

[0016] On the other hand, the present disclosure also provides an engineering machinery, which includes a main machine, an operation attachment and a quick-change apparatus for an engineering machinery, wherein the quick-change apparatus for an engineering machinery is releasably locked to the main machine and the operation attachment respectively.

[0017] The driving mechanism realizes the dual locking of the quick-change apparatus to the front and rear pin shafts connected with the operation attachment to improve the locking safety of the operation attachment. Even if the driving mechanism is malfunctioned or damaged, it is still possible to ensure the locking safety between the locking block and the operation attachment.BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Conventionally, various features of the accompanying drawings described below are not necessarily drawn to scale. The dimensions of various features and elements in the accompanying drawings may be enlarged or reduced to more clearly present the embodiments of the present disclosure.

[0019] FIG. 1 is a schematic view of the connection of the main machine, the quick-change apparatus and the operation attachment of the engineering machinery;

[0020] FIG. 2 is an exploded schematic view of each component of the quick-change apparatus;

[0021] FIG. 3 is a schematic view of the internal structure of the locking block of the quick-change apparatus in a locked state;

[0022] FIG. 4 is a schematic view of the internal structure of the locking block of the quick-change apparatus in a released state;

[0023] FIG. 5 is a schematic structural view of the locking block of the quick-change apparatus;

[0024] FIG. 6 is a schematic structural view of the upper coupling of the main body of the quick-change apparatus;

[0025] FIG. 7 is a schematic structural view of a distal part of the first driving mechanism of the quick-change apparatus; and

[0026] FIG. 8 is an assembled schematic view of the upper coupling and the lower coupling of the quick-change apparatus.REFERENCE SIGNS

[0027] 1, quick-change apparatus for engineering machinery; 2, main machine; 3, operation attachment; 10, main body; 20, locking pin; 40, locking block; 41, groove; 42, transverse connecting portion; 43, hook portion; 411, linear segment; 412, arc segment; 44, pivot hole; 30, driving mechanism; 31, first driving mechanism; 32, second driving mechanism; 60, front pin shaft; 70, rear pin shaft; 46, arc recess; 131, mounting hole; 13, mounting seat; 50, restoration elastic member; 310, distal part of first driving mechanism; 311, transverse push rod; 312, longitudinal push rod; 11, upper coupling; 12, lower coupling; 111, front connecting pin shaft; 112, rear connecting pin shaft; 60, front pin shaft; 70, rear pin shaft; 14, elongated slot; 33, first cylinder; 34, second cylinder.DETAILED DESCRIPTION

[0028] Those skilled in the art will understand the technical advantages of various embodiments by reading the following detailed description of the embodiments with reference to the accompanying drawings. Various embodiments discussed alone or in various combinations above, are within the scope of the present disclosure. It is to be noted that in the description of the present disclosure, the orientation or positional relationship indicated by the terms “front”, “rear”, “left”, “right”, “upper”, “lower”, “inner” and “outer” is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure but does not require that the present disclosure has to be constructed and operated in a specific orientation, so that it cannot be understood as limiting the present application. The terms “front”, “rear”, “left”, “right”, “upper” and “lower” used in the description of the present disclosure refer to the directions in the accompanying drawings, while the terms “inner” and “outer” refer to the directions facing towards or away from a geometric center of a specific member respectively, and the term “releasable” means “detachable” or “separable”.

[0029] The present disclosure discloses an engineering machinery, as shown in FIG. 1, which includes a main machine 2, operation attachment 3 and a quick-change apparatus 1 of the engineering machinery, and the upper portion of the quick-change apparatus 1 is releasably connected with the main machine 2, and the lower portion of the quick-change apparatus 1 is releasably connected with the operation attachment 3, so that the quick releasable connection 1 between the main machine 2 and the operation attachment 3 is realized by the quick-change apparatus 1.

[0030] In some embodiments of the present disclosure, as shown in FIGS. 2 to 4, the quick releasable locking between the main machine 2 and the operation attachment 3 is realized by the quick-change apparatus 1. The quick-change apparatus 1 includes a main body 10, a locking pin 20, a driving mechanism 30 and a locking block 40. The main body 10 has a front end and a rear end along a longitudinal direction thereof. The locking pin 20 penetrates through the longitudinal mounting hole of the rear end and is movable along the longitudinal direction, so that the rear pin shaft 70 is releasably locked between the outer end of the locking pin 20 and the rear end of the main body 10. The rear pin shaft 70 may be arranged to be detachably or fixedly connected with the operation attachment 3. The locking block 40 is pivotally arranged at the front end of the main body 10, so that the locking block 40 is shifted between a released state and a locked state during the pivoting process. In the released state, the front pin shaft 60 connected with the operation attachment 3 could enter and exit between the locking block 40 and the front end of the main body 10, and in the locked state, the front pin shaft 60 is locked between the locking block 40 and the front end of the main body 10. The front pin shaft 60 could be detachably or fixedly connected with the operation attachment 3. As shown in FIG. 2, the driving mechanism 30 is arranged between the locking pin 20 and the locking block 40, and includes a first driving mechanism 31 and a second driving mechanism 32 which move linearly opposite to each other along the longitudinal direction. The first driving mechanism 31 is slidably connected with the locking block 40 to drive the locking block 40 to pivot in the main body 10, and the size of the opening between the locking block 40 and the front end of the main body 10 is adjusted so that the locking block 40 is shifted between the released state and the locked state. The second driving mechanism 32 drives the locking pin 20 to be movable along the longitudinal direction.

[0031] As shown in FIG. 3, the first driving mechanism 31 moves outward along the longitudinal direction to push the locking block 40 to pivot counterclockwise in the main body 10, and the size of the opening between the locking block 40 and the front end of the main body 10 is reduced so that the front pin shaft 60 is locked between the locking block 40 and the front end of the main body 10, and the locking block 40 is in a locked state. At the same time, the second driving mechanism 32 drives the locking pin 20 to project outwards oppositely along the longitudinal direction, so that the rear pin shaft 70 is locked between the locking pin 20 and the rear end of the main body 10. As shown in FIG. 4, the first driving mechanism 31 moves inwards along the longitudinal direction to pull the locking block 40 to pivot clockwise in the main body 10, so as to increase the size of the opening between the locking block 40 and the front end of the main body 10, so that the front pin shaft 60 is unlocked, the locking block 40 is in a released state, and the front pin shaft 60 could enter and exit between the locking block 40 and the front end of the main body 10. At the same time, the second driving mechanism 32 drives the locking pin 20 to move inwards along the longitudinal direction, so that the locking pin 20 is out of contact with the rear pin shaft 70, and the rear pin shaft 70 is unlocked.

[0032] In some embodiments of the present disclosure, as shown in FIG. 5, the locking block 40 is provided with a pivot hole 44 and a groove 41, and a pivot shaft 45 passes through the pivot hole 44 and two transverse side walls of the main body 10 to pivotally mount the locking block 40 on the main body 10, and a distal end of the first driving mechanism 31 could slide along the groove 41 to drive the locking block 40 to pivot around the pivot shaft 45.

[0033] In some embodiments of the present disclosure, as shown in FIG. 5, the locking block 40 includes a transverse connecting portion 42 and two hook portions 43 transversely arranged at intervals and connected by the transverse connecting portion, and the two hook portions 43 are connected by the transverse connecting portion 42, and an arc recess 46 is formed on the top surface of the hook portion 43. Each hook portion 43 is provided with a pivot hole 44 and a groove 41, and a distal part 310 of the first driving mechanism 31 is slidable along the two grooves 41 between the two hook portions 43.

[0034] In some embodiments of the present disclosure, as shown in FIG. 5, the groove 41 includes a linear segment 411 far away from the pivot hole 44. In the case that the locking block 40 is in a locked state, the distal end of the first driving mechanism 31 is in the linear segment 411, and the linear segment 411 is horizontal. As shown in FIG. 3, the vertical upward action force F1 of the distal end of the first driving mechanism 31 exerted on the linear segment 411 and the vertical downward component F2Y of the action force F2 of the front pin shaft 60 exerted on the locking block 40 are equal in magnitude and opposite in direction, so that the locking block 40 achieves a balanced stress in the vertical direction. The horizontal force F3 exerted on the locking block 40 by the pivot shaft 45 and the horizontal component F2X of the force F2 exerted on the locking block 40 by the front pin shaft 60 are equal in magnitude and opposite in direction, so that the locking block 40 is in a self-locked state. Even if the first driving mechanism 31 is malfunctioned, since the locking block is in a state of force equilibrium horizontally and longitudinally, the locking block 40 will remain in a self-locked state, thereby reducing the risk of accidental unlocking.

[0035] In some embodiments of the present disclosure, as shown in FIG. 5, the groove 41 includes an arc segment 412 adjacent to the pivot hole 44, and the distal end of the first driving mechanism 31 slides along the arc segment 412, so that the locking block 40 pivots. Alternatively, in the case that the locking block 40 is in a released state, the distal end of the first driving mechanism 31 is located in the arc segment 412.

[0036] In some embodiments of the present disclosure, as shown in FIG. 2, each of the two transverse sides of the main body 10 is provided with an elongated slot 14, and each of the two transverse sides of the first driving mechanism 31 is provided with a stop pin 313, so that the two stop pins 313 are movable along the two elongated slots 14 respectively to limit a longitudinal movement range of the first driving mechanism 31.

[0037] In some embodiments of the present disclosure, as shown in FIGS. 2 and 3, the quick-change apparatus 1 includes a restoration elastic member 50 between the main body 10 and the locking block 40. The restoration elastic member 50 is configured to bias the locking block 40 to pivot toward the front pin shaft 60, for strengthening the locking between the front pin shaft 60 and the locking block 40, and preventing that the locking block 40 is accidentally unlocked when the first driving mechanism 31 is malfunctioned. The restoration elastic member 50 is a spring, for example.

[0038] In some embodiments of the present disclosure, as shown in FIGS. 2 and 6, the main body 10 includes a mounting seat 13 with a mounting hole 131. The mounting seat 13 is fixed on the main body 10, and a bearing 132 is arranged in the mounting hole, so that a distal part 310 of the first driving mechanism 31 is mounted in the bearing 132 in the mounting hole 131 so as to be movable along the longitudinal direction. The restoration elastic member 50 is arranged between the mounting seat 13 and the locking block 40 to resist the locking block 40 from departing from the front pin shaft 60.

[0039] In some embodiments of the present disclosure, as shown in FIG. 7, the distal part 310 of the first driving mechanism 31 includes a transverse push rod 311 and a longitudinal push rod 312 connected with the transverse push rod 311. The two transverse ends of the transverse push rod 311 are slidably arranged in the two grooves 41 respectively, and the longitudinal push rod 312 is longitudinally movable along the mounting hole 131. The restoration elastic member 50 is sleeved on the longitudinal push rod 312 with both ends abutting against the mounting seat 13 and the transverse push rod 311 respectively. Alternatively, the transverse push rod 311 passes through the through hole 316 on the longitudinal push rod 312 and is fixedly connected with the longitudinal push rod 312 through the connector 314.

[0040] In some embodiments of the present disclosure, as shown in FIGS. 2 to 4, the driving mechanism 30 includes a two-way cylinder, which includes a first cylinder 33 and a second cylinder 34. The first driving mechanism 31 includes the first cylinder 33, so that the distal part 310 of the first driving mechanism 31 is drivingly connected with the first cylinder 33. The second driving mechanism 32 includes the second cylinder 34, so that the locking pin 20 is drivingly connected with the second cylinder 34. The two-way cylinder is, for example, H-shaped. Alternatively, the two first cylinders 33 are connected to the distal part 310 through the push plate 15.

[0041] In some embodiments of the present disclosure, as shown in FIG. 8, the main body 10 includes an upper coupling 11 and a lower coupling 12, and the upper coupling 11 is releasably fastened to the main machine 2, and the driving mechanism 30 is slidably arranged on the upper coupling 11; the lower coupling 12 is releasably fastened to the operation tool 3. Alternatively, the upper coupling 11 includes a front connecting pin 111 located at the front end and a rear connecting pin 112 located at the rear end, which are configured to be releasably fastened to the main machine 2 respectively; and the front pin shaft 60 and the rear pin shaft 70 are arranged at the front end and the rear end of the lower coupling 12 respectively, which are configured to be releasably fastened to the operation attachment 3 respectively. Alternatively, the lower coupling 12 may be disposed on the operation attachment 3. Alternatively, as shown in FIG. 6, the two elongated slots 14 are disposed on the two transverse sides of the upper coupling 11 respectively.

[0042] On the other hand, the present disclosure also provides an engineering machinery, which includes a main machine 2, an operation attachment 3 and the aforementioned quick-change apparatus 1 for an engineering machinery, the quick-change apparatus 1 for an engineering machinery is releasably locked to the main machine 2 and the operation attachment 3 respectively.

[0043] In the present disclosure, a quick-change apparatus for an engineering machinery is provided. The locking block and locking pin are driven by the driving mechanism to realize the dual locking of the quick-change apparatus to the front and rear pin shafts connected with the operation attachment. After the front pin shaft and the locking block of the quick-change apparatus are locked in place, the mechanical self-locking is realized, which improves the locking safety of the quick-change apparatus. Even if the driving mechanism is malfunctioned or damaged, it still ensures the locking safety between the locking block and the operation attachment.

[0044] The foregoing description of the present disclosure explains and illustrates some exemplary embodiments. Various additions, modifications and alterations may be made to these exemplary embodiments without departing from the spirit and scope of the present disclosure. All the content contained in the above description or shown in the accompanying drawings is intended to be construed as illustrative rather than restrictive. In addition, the present disclosure only shows and illustrates selected embodiments of the present disclosure, but the present disclosure may be used in various other combinations, modifications and environments and may be changed or modified within the scope of the inventive concept as expressed herein, commensurate with the above teachings, and / or within the skill or knowledge of a person skilled in the relevant art. Further, certain features and characteristics of each embodiment may be selectively interchanged and applied to other shown and unshown embodiments of the present disclosure.

Claims

1. A quick-change apparatus (1) for an engineering machinery, for realizing the quick releasable locking between a main machine (2) and an operation attachment (3), comprising:a main body (10), having a front end and a rear end along a longitudinal direction thereof;a locking pin (20), movably arranged at the rear end along the longitudinal direction to releasably lock a rear pin shaft (70) to be connected with the operation attachment (3) between an outer end of the locking pin (20) and the rear end of the main body (10);a locking block (40), pivotally arranged at the front end to shift between a released state and a locked state, wherein in the released state, a front pin shaft (60) to be connected with the operation attachment (3) is capable of entering and exiting between the locking block (40) and the front end of the main body (10), and in the locked state, the front pin shaft (60) is locked between the locking block (40) and the front end of the main body (10); anda driving mechanism (30), located between the locking pin (20) and the locking block (40) and comprising a first driving mechanism (31) and a second driving mechanism (32) which move linearly in opposite directions along the longitudinal direction, wherein the first driving mechanism (31) is slidably connected with the locking block (40) to drive the locking block (40) to pivot, and the second driving mechanism (32) is configured to drive the locking pin (20) so as to be slidable along the longitudinal direction.

2. The quick-change apparatus (1) for an engineering machinery according to claim 1, wherein the locking block (40) is provided with a pivot hole (44) and a groove (41), a pivot shaft (45) passes through the pivot hole (44) and the two transverse sides of the main body (10), the locking block (40) is pivotable about the pivot shaft (45) in the main body (10) and a distal part (310) of the first driving mechanism (31) is slidable along the groove (41).

3. The quick-change apparatus (1) for an engineering machinery according to claim 2, wherein the locking block (40) comprises a transverse connecting portion (42) and two hook portions (43) that are transversely arranged at intervals and connected by the transverse connecting portion (42), a top surface of each of the hook portions (43) is provided with an arc recess (46) for receiving the front pin shaft (60), each of the hook portions (43) is provided with the pivot hole (44) and a groove (41), and the distal part (310) of the first driving mechanism (31) is slidable along the groove (41) between the two hook portions (43).

4. The quick-change apparatus (1) for an engineering machinery according to claim 2, wherein the groove (41) comprises a linear segment (411) far away from the pivot hole and in the case that the locking block (40) is in a locking state, a distal end of the first driving mechanism (31) is located in the linear segment (411), and the linear segment (411) is horizontal.

5. The quick-change apparatus (1) for an engineering machinery according to claim 2, wherein the groove (41) comprises an arc segment (412) adjacent to the pivot hole and in the case that the locking block (40) is in a released state, a distal end of the first driving mechanism (31) is located in the arc segment (412).

6. The quick-change apparatus (1) for an engineering machinery according to claim 5, wherein the distal end of the first driving mechanism (31) is slidable along the arc segment (412), so that the locking block (40) pivots.

7. The quick-change apparatus (1) for an engineering machinery according to claim 1, any comprising a restoration elastic member (50) between the main body (10) and the locking block (40), configured to bias the locking block (40) to pivot towards the front pin shaft (60).

8. The quick-change apparatus (1) for an engineering machinery according to claim 7, wherein the main body (10) comprises a mounting seat (13) having a mounting hole (131), the mounting seat (13) is arranged in the main body (10), the distal part (310) of the first driving mechanism (31) is slidable along the mounting hole (131) along the longitudinal direction, and the restoration elastic member (50) is arranged between the mounting seat (13) and the locking block (40).

9. The quick-change apparatus (1) for an engineering machinery according to claim 8, wherein the distal part (310) of the first driving mechanism (31) comprises a transverse push rod (311) and a longitudinal push rod (312) connected with the transverse push rod (311), the transverse push rod (311) is slidable along the groove (41), the longitudinal push rod (312) is longitudinally movable along the mounting hole (131), and the restoration elastic member (50) is sleeved on the longitudinal push rod (312), with both ends abutting against the mounting seat (13) and the transverse push rod (311) respectively, for biasing the transverse push rod (311) to drive the locking block (40) to pivot towards the front pin shaft (60).

10. The quick-change apparatus (1) for an engineering machinery according to claim 1, any wherein the main body (10) comprises:an upper coupling (11) configured to releasably fastened to the main machine (2), wherein the driving mechanism (30) is slidably arranged on the upper coupling (11); anda lower coupling (12) configured to releasably fastened to the operation attachment (3).

11. The quick-change apparatus (1) for an engineering machinery according to claim 10, whereinthe upper coupling (11) comprises a front connecting pin shaft (111) located at the front end thereof and a rear connecting pin shaft (112) located at the rear end thereof, and configured to be releasably fastened to the main machine (2) respectively; orthe front pin shaft (60) and the rear pin shaft (70) are arranged at a front end and a rear end of the lower coupling (12) respectively, and configured to be releasably fastened to the operation attachment (3) respectively.

12. The quick-change apparatus (1) for an engineering machinery according to claim 10, wherein each of the two transverse sides of the upper coupling (11) is provided with one elongated slot (14), each of the two transverse sides of the first driving mechanism (31) is provided with one stop pin (313), and the two stop pins (313) are slidably along the two elongated slots (14) respectively to limit a longitudinal movement range of the first driving mechanism (31).

13. The quick-change apparatus (1) for an engineering machinery according to claim 1, wherein the driving mechanism (30) comprises a two-way cylinder with a first cylinder (33) and a second cylinder (34), the first driving mechanism (31) comprises the first cylinder (33), and the distal part (310) of the first driving mechanism (31) is drivingly connected with the first cylinder (33), and the second driving mechanism (32) comprises the second cylinder (34), and the locking pin (20) is drivingly connected with the second cylinder (34).

14. An engineering machinery, comprising:a main machine (2),an operation attachment (3); andthe quick-change apparatus (1) for an engineering machinery according to claim 1;wherein the quick-change apparatus (1) for an engineering machinery is releasably locked to the main machine (2) and the operation attachment (3) respectively.

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