A mechanical quick-change device and construction machinery

Abstract

The present invention discloses a mechanical quick-change device and engineering machinery, which relate to the technical field of engineering machinery, including: a first connecting member, a second connecting member, an intermediate connecting member and a limit assembly; the first connecting member is provided with a waist-shaped hole and a first through-notch, and the second connecting member is provided with a second mounting hole and a second through-notch; the intermediate connecting member is inserted into the waist-shaped hole and the second mounting hole; the first through-notch is opposite to the second through-notch, and a mounting channel is formed therebetween to accommodate the insertion of the limit assembly; the limit assembly includes a first limiting member and a second limiting member; the first limiting member and the second limiting member can be translated relative to each other; the limit assembly can limit the distance between the first connecting member and the second connecting member after the first connecting member and the second connecting member reach the required position, thereby ensuring that the connection of the quick-change device is reliable, the overall structure is simple, the dead weight is light, and rapid switching between the quick-change device and different working accessories can be realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering machinery, and in particular relates to a mechanical quick-change device and engineering machinery. Background Art

[0002] In recent years, demolition robots have been widely used in construction and rescue operations in confined spaces. By optimizing their operating systems, they can achieve three to four times the performance of excavators of the same tonnage. To adapt to a wider range of operating scenarios, demolition robots often require replacement of the front-end attachments, typically using a quick-change mechanism to quickly switch between different attachments.

[0003] A quick-change device is an intermediate connection between the forearm and connecting rod of a demolition robot and its work attachments, primarily used to enable rapid switching between different work attachments. Traditional quick-change devices are complex and heavy. Due to the limited load-bearing capacity of a demolition robot's work arm, it is difficult to install a heavy quick-change device while still ensuring normal use of the work attachments. To meet the requirements of a demolition robot for a quick-change device, a lightweight and simple quick-change device was needed.

[0004] Chinese patent application number CN201320527072.2 discloses a quick-change attachment device comprising a left and right quick-change assembly. The left quick-change assembly comprises two front and rear left plates and an arm pin, with the two left plates connected as a whole by the arm pin. The right quick-change assembly comprises two front and rear right plates and an arm pin, with the two right plates connected as a whole by the arm pin. The left and right quick-change assemblies are connected to form a frame at their middle portions by two front and rear hinge shafts, and are connected at their upper portions by connecting bolts. In this novel quick-change attachment device, the left and right quick-change assemblies can flexibly rotate relative to the hinge shafts, and the arm pin and arm pin are directly connected to the excavator's arm and arm. In actual work, by operating the excavator's boom and dipper, the front and rear parts of the quick-change left component and the quick-change right component in the attachment quick-change device are connected to the connecting head, thereby realizing the function of quickly loading and unloading attachments; the above technology has the following shortcomings during use: 1. The quick-change connection process is complicated, the weight is large, and the connection reliability is poor; 2. A quick-change mechanism cannot be applied to a variety of work attachments with different connection sizes. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a mechanical quick-change device and engineering machinery that can quickly replace working accessories, has strong applicability, and has a simple and reliable structure.

[0006] The present invention provides the following technical solutions:

[0007] A first aspect provides a mechanical quick-change device, comprising: a first connecting member, a second connecting member, an intermediate connecting member, and a limit assembly;

[0008] The first connecting member is provided with a waist-shaped hole and a first through-slot, and the second connecting member is provided with a second mounting hole and a second through-slot; the intermediate connecting member is detachably inserted into the waist-shaped hole and the second mounting hole; the first through-slot is opposite to the second through-slot, and a mounting channel is formed therebetween for accommodating the insertion of the limit assembly; when the second connecting member and the first connecting member rotate or move relative to each other, the cross-sectional area of the mounting channel changes;

[0009] The limiting assembly includes a first limiting member and a second limiting member; at least one of the first limiting member and the second limiting member is wedge-shaped; and in the first limiting member and the second limiting member, the inclined surface of the wedge-shaped limiting member is slidably connected to the other limiting member;

[0010] The first limiting member abuts against the bottom of the first through-slot, and the second limiting member abuts against the bottom of the second through-slot; the first limiting member and the second limiting member are capable of translation relative to each other so that the first limiting member and the second limiting member are adapted to be installed on the installation channel;

[0011] A bayonet is provided on the second limiting member; the bayonet extends into the second through slot and is engaged with the second connecting member; a locking member is connected to the first limiting member and can be detachably mounted on the first connecting member to limit or release the sliding of the first limiting member relative to the second limiting member.

[0012] Preferably, there are two first connecting members and two second connecting members, the two first connecting members form a group of symmetrical members, and the two second connecting members form another group of symmetrical members; a first connecting pin is installed between the two first connecting members; and a second connecting pin is installed between the two second connecting members.

[0013] Preferably, the locking member includes a locking bolt; the first limiting member is connected to a first mounting bracket extending toward the first connecting member, and the first mounting bracket is provided with an oblong hole through which one end of the locking bolt can pass; the first connecting member is provided with a limiting hole into which the locking bolt can be screwed.

[0014] Preferably, baffles are provided on both the upper and lower sides of the second position-limiting member; and the first position-limiting member is located between the two baffles.

[0015] Preferably, the second limiting member is connected to a second connecting frame extending toward the first connecting member; an auxiliary bolt capable of changing the screw-in depth is provided on the second connecting frame, and the screw-in depth of the auxiliary bolt is adjusted to change the relative position of the first limiting member and the mounting channel.

[0016] Preferably, the end of the intermediate connecting member is provided with a stepped section; the first connecting member and the second connecting member are both sleeved on the outside of the stepped section; the end of the stepped section passes through and extends beyond the waist-shaped hole, and the part of the stepped section extending beyond the waist-shaped hole is detachably connected with an anti-falling component for limiting the first connecting member and the second connecting member from falling off the stepped section.

[0017] Preferably, the anti-fall-off assembly includes a gasket and a positioning pin; the gasket is detachably connected to the part of the step section extending beyond the waist-shaped hole through the positioning pin; the positioning pin is an anti-fall-off threaded pin threadedly connected to the step section or a B-type pin radially passing through the step section.

[0018] In a second aspect, a construction machine is provided, comprising an operating attachment and the mechanical quick-change device according to any one of the first aspects, wherein the operating attachment is detachably connected to the first connecting member and the second connecting member.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The quick-change device includes a first connecting member, a second connecting member, an intermediate connecting member and a limit assembly. The first connecting member is provided with a waist-shaped hole and a first through-slot, the second connecting member is provided with a second mounting hole and a second through-slot, and the intermediate connecting member is inserted into the waist-shaped hole and the second mounting hole; the first through-slot and the second through-slot form an installation channel that can accommodate the insertion of the limit assembly; when the first limiting member and the second limiting member are not installed in the installation channel, the spacing between the first connecting member and the second connecting member can be changed, thereby reducing the difficulty of connecting the quick-change device to the work attachment, and the cross-sectional area of the installation channel can be changed to adapt to work attachments of different connection sizes; after the first connecting member and the second connecting member reach the required position, the limit assembly can limit the distance between the first connecting member and the second connecting member, thereby ensuring the reliable connection of the quick-change device, the overall structure is simple, the weight is light, and rapid switching between the quick-change device and different work attachments can be achieved.

[0021] The limiting assembly includes a first limiting member and a second limiting member, and the first limiting member and the second limiting member can be translated relative to each other so that the limiting assembly can be adapted to be installed on the installation channel; at least one of the first limiting member and the second limiting member is wedge-shaped, and the use of the wedge shape can make the first limiting member and the second limiting member lock each other, and at the same time, with the help of the locking bolt, the connection reliability of the quick-change device and the work attachment is high and the connection process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 2. It is a schematic diagram of the overall assembly structure of the mechanical quick-change device in the embodiment;

[0023] Figure 2 2. It is a schematic diagram of the overall exploded structure of the mechanical quick-change device in the embodiment;

[0024] Figure 3 is a structural schematic diagram of a first connecting member of a mechanical quick-change device in an embodiment;

[0025] Figure 4 is a schematic structural diagram of a second connecting member of a mechanical quick-change device in an embodiment;

[0026] Figure 5 2 is a schematic structural diagram of a first position-limiting member of a mechanical quick-change device in an embodiment;

[0027] Figure 6 2 is a schematic structural diagram of a second position-limiting member of a mechanical quick-change device in an embodiment;

[0028] Figure 7 2 is a schematic diagram of the overall structure of a mechanical quick-change device in an embodiment using another anti-fall-off component;

[0029] Figure 8 2 is a schematic structural diagram of an intermediate connecting member of a mechanical quick-change device in an embodiment using another anti-drop assembly;

[0030] Figure 9 This is a schematic structural diagram of the mechanical quick-change device before being connected to the working attachment in the embodiment;

[0031] Figure 10 3 is a schematic diagram of the structure after the mechanical quick-change device is connected to the working attachment in the embodiment.

[0032] Markings in the figure are: 1 is the first connecting piece, 11 is the waist hole, 12 is the first through slot, 13 is the limiting hole, 2 is the second connecting piece, 21 is the second mounting hole, 22 is the second through slot, 3 is the intermediate connecting piece, 31 is the step section, 311 is the anti-drop hole, 312 is the pin hole, 313 is the limiting step shaft, 32 is the anti-drop component, 321 is the gasket 1, 322 is the anti-drop threaded pin, 323 is the gasket 2, 324 is Type B pin, 4 is the limit assembly, 41 is the first limit piece, 411 is the oblong hole, 412 is the first inclined surface, 42 is the second limit piece, 421 is the bayonet, 422 is the baffle, 423 is the second inclined surface, 43 is the locking bolt, 44 is the auxiliary bolt, 5 is the first connecting pin, 6 is the second connecting pin, 7 is the connecting rod, 8 is the forearm, 9 is the working attachment, 91 is the left hook type structure, 92 is the right hook type structure, and 10 is the expansion pin. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0034] It should be noted that, in the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0035] Example 1

[0036] like Figure 1 As shown, a mechanical quick-change device includes: a first connecting member 1, a second connecting member 2, an intermediate connecting member 3 and a limiting assembly 4.

[0037] Alternatively, as Figure 1-2 As shown, a first connecting pin 5 is installed on the first connecting member 1, and the first connecting pin 5 passes through the first connecting member 1 front to back; a second connecting pin 6 is installed on the second connecting member 2, and the second connecting pin 6 passes through the second connecting member 2 front to back; there are two first connecting members 1 and second connecting members 2; that is, the two first connecting members 1 are respectively located at the two ends of the first connecting pin 5, and the two second connecting members 2 are respectively located at the two ends of the second connecting pin 6. The two first connecting members 1 are a group of symmetrical members, and the two second connecting members 2 are another group of symmetrical members; the first connecting pin 5 is connected to the first connecting member 1 by an expansion pin 10; the second connecting pin 6 is also connected to the second connecting member 2 by an expansion pin 10. The setting of the first connecting pin 5 and the second connecting pin 6 can facilitate the connection of the quick-change device with the working arm and the working attachment 9. Of course, the first connecting member 1 and the second connecting member 2 can also be used directly to realize the connection between the quick-change device and the working arm and the working attachment 9.

[0038] like Figure 1-4 As shown, the first connecting member 1 is provided with a waist-shaped hole 11 and a first through-slot 12; the second connecting member 2 is provided with a second mounting hole 21 and a second through-slot 22; the intermediate connecting member 3 is detachably inserted into the waist-shaped hole 11 and the second mounting hole 21, and at this time the first connecting member 1 and the second connecting member 2 partially overlap in the front-to-back direction; when there are two first connecting members 1 and two second connecting members 2, the two second connecting members 2 can be located between the two first connecting members 1, or the two first connecting members 1 can be located between the two second connecting members 2.

[0039] Specifically, if Figure 2As shown, the intermediate connecting member 3 is a cylindrical connecting rod, and there are stepped sections 31 at both ends of the intermediate connecting member 3, that is, the diameter of the stepped section 31 is smaller than the diameter of the intermediate connecting member 3; the first connecting member 1 and the second connecting member 2 are sleeved on the outside of the stepped section 31, and the front and rear two first connecting members 1 are respectively located at both ends of the intermediate connecting member 3, and the front and rear two second connecting members 2 are also respectively located at both ends of the intermediate connecting member 3, the second mounting hole 21 is adapted to the stepped section 31, and the waist-shaped hole 11 is provided with a gap that can accommodate the rotation of the stepped section 31, that is, the first connecting pin 5 and the first connecting member 1 can be relative to the intermediate connecting member The part 3 rotates or translates, and the second connecting pin 6, the second connecting part 2, and the intermediate connecting part 3 remain relatively stationary during the operation. When the first connecting pin 5 and the first connecting part 1 are in a stationary state, the intermediate connecting part 3 can drive the second connecting part 2 and the second connecting pin 6 to move along the length direction of the waist-shaped hole 11, or rotate with the intermediate connecting part 3 as the axis; the setting of the waist-shaped hole 11 enables the first connecting part 1 and the second connecting part 2 to move relative to each other or move back to back, or enables the first connecting part 1 and the second connecting part 2 to rotate relative to each other, thereby adapting to work accessories 9 with different connection sizes.

[0040] like Figure 2 As shown, the end of the step section 31 passes through and extends beyond the waist-shaped hole 11, and the part of the step section 31 extending beyond the waist-shaped hole 11 is detachably connected with an anti-falling component 32 for limiting the first connecting member 1 and the second connecting member 2 from falling off from the step section 31.

[0041] The anti-fall-off assembly 32 includes a gasket and a positioning pin; the gasket is detachably connected to the part of the step section 31 extending beyond the waist-shaped hole 11 through the positioning pin; the positioning pin is an anti-fall-off threaded pin 322 threadedly connected to the step section 31 or a B-type pin 324 radially passing through the step section 31.

[0042] When the positioning pin is an anti-slip threaded pin 322, the free end face of the step section 31 is provided with an anti-slip hole 311, and the anti-slip hole 311 is coaxial with the step section 31; the gasket 1 321 abuts against the free end face of the step section 31; the anti-slip threaded pin 322 passes through the gasket 1 321 and is screwed into the anti-slip hole 311.

[0043] When the positioning pin is a B-type pin 324, as Figure 7-8 As shown, a limiting step shaft 313 is provided at the end of the step section 31, the diameter of the limiting step shaft 313 is smaller than the diameter of the step section 31, and a pin hole 312 is opened on the circumferential surface of the limiting step shaft 313, the axial direction of the pin hole 312 is the radial direction of the limiting step shaft 313, and the gasket 2 323 abuts against the step surface connecting the limiting step shaft 313 and the step section 31; the B-type pin 324 is inserted into the pin hole 312.

[0044] like Figure 1-4 As shown, the first through-slot 12 of the first connecting member 1 is opposite to the second through-slot 22 of the second connecting member 2, that is, the first through-slot 12 faces the second connecting member 2, and the second through-slot 22 faces the first connecting member 1; when the intermediate connecting member 3 is inserted into the waist-shaped hole 11 and the second mounting hole 21, the first through-slot 12 and the second through-slot 22 form a mounting channel, and the limiting component 4 can be inserted into the mounting channel from the front and back directions, and both ends of the limiting component 4 extend out of the mounting channel; when the second connecting member 2 and the first connecting member 1 rotate or move relative to each other, the cross-sectional area of the mounting channel changes, and the cross-sectional area of the passage can be rectangular, that is, when the spacing between the first connecting pin 5 and the second connecting pin 6 becomes larger or smaller, the cross-sectional area of the mounting channel becomes larger or smaller.

[0045] like Figure 1 、 2 As shown in Figures 5 and 6, the limiting assembly 4 includes a first limiting member 41 and a second limiting member 42; the first limiting member 41 abuts against the bottom of the first through slot 12, and the second limiting member 42 abuts against the bottom of the second through slot 22; the first limiting member 41 and the second limiting member 42 can be translated relative to each other, so that the first limiting member 41 and the second limiting member 42 can be adapted to be installed on the installation channel with a changed cross-sectional area; after the limiting assembly 4 is inserted into the passage, it can limit the position of the first connecting pin 5 and the second connecting pin 6, thereby ensuring the reliability of the quick-change device.

[0046] Alternatively, as Figure 1 、 6 As shown, a bayonet 421 is provided on the second limiting member 42; the bayonet 421 extends into the second through slot 22 and is engaged with the front and rear sides of the second connecting member 2; there are two bayonet 421 on the second limiting member 42, and they are respectively engaged with the front and rear second connecting members 2; the bayonet 421 extends into the second through slot 22 from the front and rear sides and is engaged with the front and rear sides of the second connecting member 2, that is, the second limiting member 42 is detachably installed in the second through slot 22, the first limiting member 41 can slide relative to the second limiting member 42, and the first limiting member 41 can slide out of the second limiting member 42.

[0047] Specifically, if Figure 1 、 2As shown in , 5, at least one of the first limiting member 41 and the second limiting member 42 is wedge-shaped, and after the first limiting member 41 and the second limiting member 42 move relative to each other, they can adapt to the installation channel with a changed cross-sectional area; the inclined surface of the wedge-shaped limiting member is slidably connected to the other limiting member; optionally, the first limiting member 41 and the second limiting member 42 are both wedge-shaped, and the first inclined surface 412 of the first limiting member 41 is abutted against the second inclined surface 423 of the second limiting member 42, and the first inclined surface 412 of the first limiting member 41 can slide along the second inclined surface 423 of the second limiting member 42; the projections of the first limiting member 41 and the second limiting member 42 on the horizontal plane are both right-angled trapezoids, and the first inclined surface 412 of the first limiting member 41 is connected to its large head end plane and small head end plane, and the first The first inclined surface opposite to the limiting member 41 abuts against the bottom of the first through slot 12; the second inclined surface 423 of the second limiting member 42 is connected to its large end end plane and small end plane, and the second inclined surface opposite to the second limiting member 42 abuts against the bottom of the second through slot 22, and the bayonet 421 is integrally formed on the second inclined surface opposite to the limiting member 41; when the inclined surface of the first limiting member 41 slides along the inclined surface of the second limiting member 42, the distance between the first inclined surface opposite to the second inclined surface changes, so that it is adapted to be installed in the installation channel; under the cooperation of the first limiting member 41 and the second limiting member 42, the cross-sectional area of the installation channel is limited, thereby ensuring the stability of the distance between the first connecting pin 5 and the second connecting pin 6, and ensuring the stability and reliability of the quick-change device.

[0048] Alternatively, as Figure 6 As shown, baffles 422 are provided on the upper and lower sides of the second limiting member 42, and the first limiting member 41 is located between the two baffles 422. The setting of the baffle 422 can limit the installation position of the first limiting member 41 and provide guidance for the movement of the first limiting member 41.

[0049] Specifically, a locking member is connected to the first limiting member 41, and the locking member is detachably mounted on the first connecting member 1 so as to limit the sliding of the first limiting member 41 relative to the second limiting member 42, or to release the restriction on the sliding of the first limiting member 41 and the second limiting member 42; optionally, the locking member is a locking bolt 43; a first mounting bracket extending toward the first connecting member 1 is connected to the flat surface of the large end of the first limiting member 41, and the first mounting bracket is integrally formed with the first limiting member 41; a locking member is provided on the first mounting bracket to enable the locking member 43 to slide relative to the second limiting member 42; The threaded end of the tightening bolt 43 passes through the oblong hole 411; the first connecting member 1 is provided with a limiting hole 13 into which the locking bolt 43 can be screwed, that is, the locking bolt 43 passes through the oblong hole 411 and is installed in the limiting hole 13, thereby suppressing the sliding of the first limiting member 41; the depth of the locking bolt 43 screwed into the limiting hole 13 is adjustable; the setting of the oblong hole 411 can ensure that after the first limiting member 41 slides relative to the second limiting member 42, the locking bolt 43 can still be screwed into the limiting hole 13, thereby realizing the limitation of the moving position of the first limiting member 41.

[0050] In order to facilitate the disassembly of the first limit member 41, the second limit member 42 is connected to a second connecting frame extending toward the first limit member 41; the second connecting frame is provided with an auxiliary bolt 44 that can change the screw-in depth, and the auxiliary bolt 44 is opposite to the small head end plane of the first limit member 41 and can rest on the small head end plane of the first limit member 41. When there is no locking bolt 43 to lock the first limit member 41, tightening the auxiliary bolt 44 can push the first limit member 41 out of the passage.

[0051] Assembly process of quick change device: Figure 1-2 As shown, the two front and rear first connecting members 1 are installed at both ends of the first connecting pin 5 through the expansion pin 10, and the two front and rear second connecting members 2 are installed at both ends of the second connecting pin 6 through the expansion pin 10, the first connecting member 1 and the second connecting member 2 are sleeved on the end of the middle connecting member 3, and the anti-fall-off assembly 32 located on the outside of the first connecting member 1 and the second connecting member 2 is installed; the bayonet 421 of the second limiting member 42 is stuck in the second through slot 22, the auxiliary bolt 44 installed on the second limiting member 42 is loosened, and the first limiting member 41 slides along the second inclined surface 423 of the second limiting member 42 until the first limiting member 41 abuts against the bottom of the first through slot 12, and the locking bolt 43 of the first limiting member 41 is tightened.

[0052] When the first limit member 41 and the second limit member 42 are not installed, the first connecting member 1 and the second connecting member 2 can move relative to each other or move back to back, or the first connecting member 1 and the second connecting member 2 can rotate relative to each other, thereby changing the distance between the first connecting pin 5 and the second connecting pin 6, making it easier to connect the quick-change device to the work attachment 9.

[0053] like Figure 9 、 10 As shown, when the quick-change device is installed on the working arm of the demolition robot, the first connecting pin 5 is installed on the connecting rod 7 of the working arm, and the second connecting pin 6 is installed on the forearm 8 of the working arm. When replacing different working accessories 9, the quick-change device and the working arm remain in an installed state, thereby further shortening the time for replacing the working accessories 9.

[0054] The connection between the quick-change device and the operating tool 9 is as follows: Figure 9 、 10 As shown, tighten the auxiliary bolt 44, loosen the locking bolt 43, so that the first limit member 41 is disengaged from the second limit member 42, and remove the second limit member 42 from the second through slot 22; reduce the distance between the first connecting pin 5 and the second connecting pin 6; manipulate the connecting rod 7 and the forearm 8 of the working arm so that the first connecting pin 5 is connected to the left hook-type structure 91 on the working attachment 9, and at the same time, the second connecting pin 6 is connected to the right hook-type structure 92 on the working attachment 9; install the second limit member 42 into the installation channel, loosen the auxiliary bolt 44, and install the first limit member 41 until the first limit member 41 rests against the bottom of the first through slot 12, tighten the locking bolt 43, so that the distance between the first connecting pin 5 and the second connecting pin 6 remains unchanged, and complete the connection between the quick-change device and the working attachment 9.

[0055] When it is necessary to disconnect the quick-change device from the work attachment 9, it is only necessary to loosen the locking bolt 43 on the first stopper 41 and tighten the auxiliary bolt 44 on the second stopper 42 to allow the first stopper 41 to move relative to the second stopper 42. The quick-change device can then be removed from the work attachment 9 by removing the first stopper 41 and the second stopper 42. This application only describes an attachment structure for a bucket, and the attachment structure can of course be adjusted based on existing technology and actual needs.

[0056] In some other embodiments, the first limit member 41 and the second limit member 42 can also be connected by a telescopic member with adjustable length. After the length of the telescopic member is changed, the first limit member and the second limit member can move toward or away from each other, so as to adapt to installation in the installation channel with a changed cross-sectional area.

[0057] Example 2

[0058] See also Figure 9 、 Figure 10An embodiment of the present invention provides an engineering machine, including an operating tool and the mechanical quick-change device of Example 1, wherein the operating tool 9 is detachably connected to the first connecting member 1 and the second connecting member 2. It should be noted that the "detachable connection" here can be a direct connection or an indirect connection. As an embodiment of the present invention, a first connecting pin 5 can be provided on the first connecting member 1, and a second connecting pin 6 can be provided on the second connecting member 2. During installation, the operating tool 9 is detachably connected to both the first connecting pin 5 and the second connecting pin 6.

[0059] In view of the fact that the engineering machinery provided in the embodiment of the present invention adopts the mechanical quick-change device described in Example 1, the specific structure, working principle, technical effect and assembly method of the mechanical quick-change device with the working attachment 9 can be referred to Example 1 and will not be elaborated here.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A mechanical quick-change device, characterized in that: include: A first connecting member, a second connecting member, an intermediate connecting member and a limiting assembly; The first connecting member is provided with a waist-shaped hole and a first through-notch, and the second connecting member is provided with a second mounting hole and a second through-notch; the intermediate connecting member is detachably inserted into the waist-shaped hole and the second mounting hole; the first through-notch and the second through-notch are opposite to each other, and a mounting channel is formed therebetween to accommodate the insertion of the limit assembly; when the second connecting member and the first connecting member rotate or move relative to each other, the cross-sectional area of the mounting channel changes; The limiting assembly includes a first limiting member and a second limiting member; at least one of the first limiting member and the second limiting member is wedge-shaped; and in the first limiting member and the second limiting member, the inclined surface of the wedge-shaped limiting member is slidably connected to the other limiting member; The first limiting member abuts against the bottom of the first through slot, and the second limiting member abuts against the bottom of the second through slot; The first limiting member and the second limiting member can translate relative to each other so that the first limiting member and the second limiting member are adapted to be installed on the installation channel; A bayonet is provided on the second limiting member; the bayonet extends into the second through slot and is engaged with the second connecting member; a locking member is connected to the first limiting member and can be detachably mounted on the first connecting member to limit or release the sliding of the first limiting member relative to the second limiting member.

2. The mechanical quick change device according to claim 1, characterized in that: There are two first connecting members and two second connecting members, the two first connecting members form a group of symmetrical members, and the two second connecting members form another group of symmetrical members; a first connecting pin is installed between the two first connecting members; and a second connecting pin is installed between the two second connecting members.

3. The mechanical quick change device according to claim 1, characterized in that: The locking member includes a locking bolt; the first limiting member is connected to a first mounting bracket extending toward the first connecting member, and the first mounting bracket is provided with an oblong hole through which one end of the locking bolt can pass; the first connecting member is provided with a limiting hole into which the locking bolt can be screwed.

4. The mechanical quick change device according to claim 1, characterized in that: Baffles are provided on both the upper and lower sides of the second position-limiting member; and the first position-limiting member is located between the two baffles.

5. The mechanical quick change device according to claim 1, characterized in that: The second limiting member is connected to a second connecting frame extending toward the first connecting member; the second connecting frame is provided with an auxiliary bolt capable of changing the screw-in depth, and the screw-in depth of the auxiliary bolt is adjusted to change the relative position of the first limiting member and the mounting channel.

6. The mechanical quick change device according to claim 1, characterized in that: The end of the intermediate connecting piece is provided with a stepped section; the first connecting piece and the second connecting piece are both sleeved on the outside of the stepped section; the end of the stepped section passes through and extends beyond the waist-shaped hole, and the part of the stepped section extending beyond the waist-shaped hole is detachably connected with an anti-falling component for limiting the first connecting piece and the second connecting piece from falling off the stepped section.

7. The mechanical quick change device according to claim 6, characterized in that: The anti-fall-off assembly includes a gasket and a positioning pin; the gasket is detachably connected to the part of the step section extending beyond the waist-shaped hole through the positioning pin; the positioning pin is an anti-fall-off threaded pin threadedly connected to the step section or a B-type pin radially passing through the step section.

8. An engineering machine, characterized in that: It comprises an operating attachment and the mechanical quick-change device according to any one of claims 1 to 7, wherein the operating attachment is detachably connected to the first connecting member and the second connecting member.

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