Quick change device and excavator

Abstract

The invention discloses a quick-change device and an excavator in the technical field of excavators, and aims to solve the problems that in the prior art, a quick-change device is generally and directly mounted between a bucket and a bucket rod, the weight of the device is heavy, the cutting radius of the bucket is increased, the digging force of the bucket is reduced, and the performance of the whole machine is reduced accordingly. The quick-change bucket comprises a bucket rod and a bucket, one end of the bucket rod is provided with a quick-change support rotationally connected, the outer wall of the bucket rod is provided with a rocker rotationally connected, the same connecting rod mechanism is rotationally connected between the quick-change support and the rocker, and the same power mechanism is rotationally connected between the connecting rod mechanism and the bucket rod; the bucket is fixed through the first pin shaft and the second pin shaft on the connecting rod body, the cutting radius of the bucket is not increased, the excavating force of a standard product can be fully exerted, and the excavating performance of the whole machine is guaranteed; and on the other hand, when the excavator working device is completely retracted, the bucket is not prone to interfering with the movable arm lower sealing plate or the top of the excavator cab, and safety is improved.

Description

Technical Field

[0001] The invention relates to a quick-change device and an excavator, belonging to the technical field of excavators. Background Art

[0002] With the development of engineering technology and the intensification of market competition, customers have higher and higher requirements for the performance, safety and economy of excavators. As the most commonly used engineering machinery in daily construction, excavators can undertake a variety of operating functions by replacing accessories. They are widely used in various construction scenarios. In order to enable the excavator to quickly replace accessories, the traditional practice is to add a quick-change device between the front end of the excavator boom and the accessories. The most commonly used quick-change device at present is the hydraulic quick connector. The driver controls the extension and retraction of the hydraulic cylinder of the hydraulic quick connector through the button inside the cab, and drives the locking mechanism to connect and separate with the accessories. It can be realized that accessories can be replaced without getting off the vehicle, which greatly improves the replacement efficiency of accessories and construction safety.

[0003] The existing quick-change device is usually installed directly between the bucket and the dipper arm. The device is heavy and increases the cutting radius of the bucket, resulting in a decrease in the digging force of the bucket and the performance of the entire machine, which affects the actual working effect of the excavator. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a quick-change device and an excavator to solve the problem that the existing quick-change device is usually directly installed between the bucket and the dipper arm, the device is heavy, and the cutting radius of the bucket is increased, resulting in a decrease in the digging force of the bucket and a decrease in the performance of the entire machine.

[0005] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a quick-change device, including a bucket and a bucket, wherein one end of the bucket is provided with a rotatably connected quick-change bracket, an outer wall of the bucket is provided with a rotatably connected rocker, a same connecting rod mechanism is rotatably connected between the quick-change bracket and the rocker, and a same power mechanism is rotatably connected between the connecting rod mechanism and the bucket; The quick-change bracket includes a first ear plate, a first pin is provided on the outer wall of the first ear plate, the first ear plate is rotatably connected to the bucket arm through the first pin, the connecting rod mechanism includes a connecting rod body, a second pin is symmetrically provided on the outer wall of the connecting rod body for sliding connection, a driving mechanism for pushing the two second pins to move closer to or away from each other is provided in the connecting rod body, the first ear plate is rotatably connected to the connecting rod body through one of the second pins, the bucket is provided with a second ear plate, a first groove for placing the first pin is opened on the second ear plate, and a baffle for passing one of the second pins is provided on the second ear plate.

[0006] Furthermore, the number of the first ear plates is two, a bent plate is provided between the two first ear plates, and the first pin shaft is provided between the two first ear plates.

[0007] Furthermore, an outer wall of the first ear plate is provided with an axis flange plate outside the first pin shaft, and the axis flange plate is detachably connected to the first ear plate through a pin.

[0008] Furthermore, an inner flange plate and an outer flange plate are respectively provided on both sides of the outer wall of the first ear plate, and a first bearing for passing the second pin shaft is provided between the inner flange plate, the first ear plate and the outer flange plate.

[0009] Furthermore, the number of the second ear plates is two and they are arranged on both sides of the outer wall of the bucket. The outer wall of the second ear plate is provided with a second groove, a fixed flange plate is provided in the second groove, the baffle plate is detachably connected to the fixed flange plate by bolts, and a second bearing for passing the second pin shaft is provided between the baffle plate and the fixed flange plate.

[0010] Furthermore, a gasket is provided on the outer wall of the bolt.

[0011] Furthermore, a rear axle seat is symmetrically provided on one side of the outer wall of the connecting rod body, a support plate for fixing the driving mechanism is provided on the outer wall of the connecting rod body between the two rear axle seats, and a protective plate is provided on the outer side of the driving mechanism.

[0012] Furthermore, the driving mechanism includes a cylinder, which is arranged on the support plate, and a first guide plate and a second guide plate are provided at the output end of the cylinder, the two second pin shafts are respectively slidably connected with the two rear axle seats, and adjacent ends of the two second pin shafts are slidably connected, a fixing bolt is provided on one side of the outer wall of the second pin shaft, a sleeve is sleeved on the outer wall of the fixing bolt, a pad is provided on the outer wall of the sleeve, a first guide groove is opened on the first guide plate, and a second guide groove is opened on the second guide plate, and the two sleeves are respectively slidably connected with the first guide groove and the second guide groove.

[0013] Furthermore, the protection plate includes a sealing plate, a first mounting plate is provided on the support plate, a second mounting plate is provided between the two rear axle seats, the sealing plate is detachably connected to the first mounting plate and the second mounting plate, and an anti-collision block is provided on one side of the outer wall of the sealing plate.

[0014] In a second aspect, the present invention provides an excavator, comprising the quick-change device described in the first aspect.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention fixes the relative position of the dipper arm and the bucket by cooperating with the first pin shaft, the second pin shaft, the first groove and the baffle plate to complete the quick change of the bucket. The quick change bracket of the present invention is installed at one end of the dipper arm, and its size is smaller than that of the prior art, which can reduce the functional loss during work. At the same time, the present invention fixes the bucket by the first pin shaft and the second pin shaft on the connecting rod body, and does not increase the cutting radius of the bucket, which can give full play to the digging force of the standard product and ensure the digging performance of the whole machine. On the other hand, when the excavator working device is fully retracted, the bucket is not easy to interfere with the lower cover plate of the boom or the top of the excavator cab, thereby improving safety. 2. The present invention cooperates with the oil cylinder, the first guide plate and the second guide plate. When the oil cylinder fails, the second pin shaft will not retract, ensuring that the quick-change bracket and the bucket will not separate automatically, and the safety is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the main structure of a quick-change device provided according to an embodiment of the present invention; Figure 2 is a schematic diagram of the three-dimensional structure of a bucket provided in an embodiment of the present invention; Figure 3 is a schematic diagram of the three-dimensional structure of a quick-change bracket provided according to an embodiment of the present invention; Figure 4 is a schematic diagram of the three-dimensional structure of a connecting rod mechanism provided according to an embodiment of the present invention; Figure 5 is a schematic diagram of an exploded structure of a connecting rod mechanism provided according to an embodiment of the present invention; Figure 6 is a schematic diagram of the three-dimensional structure of a quick-change device provided according to an embodiment of the present invention; Figure 7 is a schematic diagram of the main structure of a quick-change device provided by an embodiment of the present invention from another angle; Figure 8 yes Figure 7 Schematic diagram of the cross-sectional structure at AA in the middle; Fig. 9 It is a schematic diagram of the three-dimensional structure of a quick-change device after the quick-change work is completed according to an embodiment of the present invention; Fig.10 yes Fig. 9 Schematic diagram of the enlarged structure at C in the middle; Fig.11 is a schematic diagram of a three-dimensional structure from another angle after a quick-change operation of a quick-change device provided by an embodiment of the present invention is completed; Fig.12 yes Fig.11 Schematic diagram of the enlarged structure at D in the middle; Fig.13 yes Fig.11The enlarged structural diagram when the baffle is removed at D in the middle; Fig.14 is a schematic diagram of the three-dimensional structure of a driving mechanism provided according to an embodiment of the present invention; Fig.15 It is a schematic diagram of the main structure of a quick-change device after the quick-change work is completed according to an embodiment of the present invention; Fig.16 yes Fig.15 A schematic diagram of the cross-sectional structure when the second pin shaft at the middle BB is not extended; Fig.17 yes Fig.15 A schematic diagram of the cross-sectional structure when the second pin is extended at the middle BB; Fig.18 is a schematic diagram of a top view of the structure of the driving mechanism provided by an embodiment of the present invention when the second pin shaft is not extended; Fig.19 1 is a schematic diagram of a top view of the structure when the second pin shaft of the driving mechanism provided by an embodiment of the present invention is extended.

[0017] In the figure: 4, rocker; 5, bucket rod; 6, power mechanism; 7, connecting rod mechanism; 71, connecting rod body; 72, protection plate; 73, driving mechanism; 711, first mounting plate; 712, support plate; 713, rear axle seat; 714, second mounting plate; 721, sealing plate; 722, anti-collision block; 731, oil cylinder; 732, first guide plate; 733, fixing bolt; 734, pad; 735, sleeve; 736, second pin shaft; 737, Second guide plate; 738, first guide groove; 739, second guide groove; 8, quick-change bracket; 81, inner flange plate; 82, bent plate; 83, outer flange plate; 84, first bearing; 85, first ear plate; 86, pin; 87, shaft flange plate; 88, first pin shaft; 9, bucket; 91, second ear plate; 92, first groove; 93, second groove; 94, fixed flange plate; 95, second bearing; 96, baffle; 97, gasket; 98, bolt. DETAILED DESCRIPTION

[0018] 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 solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances. Embodiment 1:

[0021] like Figure 1-Figure 7 As shown, the present invention provides a quick-change device, including a bucket 5 and a bucket 9, wherein one end of the bucket 5 is provided with a rotatably connected quick-change bracket 8, the outer wall of the bucket 5 is provided with a rotatably connected rocker 4, the quick-change bracket 8 and the rocker 4 are rotatably connected to each other through a same connecting rod mechanism 7, and the connecting rod mechanism 7 and the bucket 5 are rotatably connected to each other through a same power mechanism 6; the quick-change bracket 8 includes a first ear plate 85, the outer wall of the first ear plate 85 is provided with a first pin shaft 88, the first ear plate 85 is rotatably connected to the bucket 5 through the first pin shaft 88, and the connecting rod mechanism 7 includes a connecting rod body 71, the outer wall of the connecting rod body 71 is symmetrically provided with a second pin shaft 736 that is slidably connected, the connecting rod body 71 is provided with a driving mechanism 73 for pushing the two second pin shafts 736 to move closer to or away from each other, the first ear plate 85 is rotatably connected to the connecting rod body 71 through one of the second pin shafts 736, the bucket 9 is provided with a second ear plate 91, the second ear plate 91 is provided with a first groove 92 for accommodating the first pin shaft 88, and the second ear plate 91 is provided with a baffle 96 for passing one of the second pin shafts 736.

[0022] Specifically, when the quick-change bracket 8 and the rocker 4 are installed on the bucket 5, the connecting rod mechanism 7 is installed between the quick-change bracket 8 and the rocker 4. At this time, the connecting rod mechanism 7, the bucket 5, the quick-change bracket 8 and the rocker 4 form a four-link structure. When the power mechanism 6 starts to work, the four-link mechanism can be pushed to move, thereby driving the connecting rod structure 7 and the bucket 5 to move relative to each other, so as to adjust the connecting rod mechanism 7 to the desired position; optionally, the power mechanism 6 is a bucket cylinder; specifically, when the bucket 9 is working quickly, first the bucket 9 is moved. The bucket 9 is placed on the ground, and the arm 5 is driven to move, so that the arm 5 moves to one side of the bucket 9, and the first ear plate 85 and the first pin 88 move with the arm 5 until the first pin 88 is placed inside the first groove 92 on the second ear plate 91, so as to achieve the matching and docking of the first pin 88, thereby completing the preliminary fixation of the bucket 9 and the arm 5, and then controlling the power mechanism 6 to start working, thereby driving the quick-change bracket 8, the rocker 4 and the connecting rod mechanism 7 to move, so that the connecting rod mechanism 7 is close to the bucket 9, When the connecting rod mechanism 7 moves, the second pin shaft 736 moves with the connecting rod body 71, and the connecting rod body 71 is rotatably connected to the first ear plate 85 through the second pin shaft 736, and the first ear plate 85 is rotatably connected to the bucket 5 through the first pin shaft 88. When the connecting rod body 71 moves, the second pin shaft 736 can be driven to swing around the first pin shaft 88 and approach the bucket 9 at the same time. When the second pin shaft 736 moves to one side of the baffle plate 96, the driving mechanism 73 can be controlled to start working, thereby pushing the two second pin shafts 736 to move. The shafts 736 move away from each other, and the second pin shaft 736 extends out, so that at least one of the second pin shafts 736 can move to the inside of the baffle 96. At this time, at least one of the second pin shafts 736 is simultaneously located inside the connecting rod body 71, the first ear plate 85 and the second ear plate 91, thereby further fixing the positions of the boom 5 and the bucket 9. At this time, the first pin shaft 88, the second pin shaft 736, the first groove 92 and the baffle 96 cooperate to fix the relative positions of the boom 5 and the bucket 9, completing the quick change of the bucket 9.

[0023] The present invention fixes the relative positions of the boom 5 and the bucket 9 through the cooperation of the first pin 88, the second pin 736, the first groove 92 and the baffle 96, thereby completing the quick change of the bucket 9. The quick change bracket 8 of the present invention is installed at one end of the boom 5, and its size is smaller than that of the prior art, which can reduce the functional loss during operation. At the same time, the present invention fixes the bucket 9 through the first pin 88 and the second pin 736 on the connecting rod body 71, and does not increase the cutting radius of the bucket 9, which can give full play to the digging force of the standard product and ensure the digging performance of the whole machine. On the other hand, when the excavator working device is fully retracted, the bucket 9 is not easy to interfere with the lower cover plate of the boom or the top of the excavator cab, thereby improving safety.

[0024] When the present invention is actually used, the driver can independently complete the combination or separation of the quick-change device and the tool in the car, thereby ensuring the practicality of the present invention; the present invention has no complex structure and low manufacturing cost.

[0025] In one embodiment, the number of the first ear plates 85 is two, a bent plate 82 is provided between the two first ear plates 85, the first pin shaft 88 is arranged between the two first ear plates 85, and an outer wall of the first ear plate 85 is provided with an axis flange plate 87 on the outer side of the first pin shaft 88, and the axis flange plate 87 is detachably connected to the first ear plate 85 by a pin 86.

[0026] Specifically, there are two first ear plates 85, the bent plate 82 is used to fix the two first ear plates 85, the first pin shaft 88 is located between the two first ear plates 85, ensuring the stability of the position of the first pin shaft 88, and the shaft flange plate 87 is used to support the first pin shaft 88, ensuring the stability of the structure of the present invention; the optional shaft flange plate 87 can be fixed to the first ear plate 85 by a pin 86 or a mounting bolt.

[0027] like Figure 3 As shown, in one embodiment, an inner flange plate 81 and an outer flange plate 83 are respectively provided on both sides of the outer wall of the first ear plate 85, and a first bearing 84 for passing the second pin shaft 736 is provided between the inner flange plate 81, the first ear plate 85 and the outer flange plate 83.

[0028] Specifically, the inner flange plate 81 and the outer flange plate 83 cooperate to support and fix the first bearing 84. Optionally, there are two first ear plates 85. When the quick-change bracket 8 is rotatably connected to the connecting rod mechanism 7, the two second pins 736 on the connecting rod body 71 are respectively located inside the two first bearings 84, so that the first ear plate 85 is rotatably connected to the connecting rod body 71, while ensuring the stability of the position between the two; optionally, the spacing between the two inner flange plates 81 is slightly larger than the width of the connecting rod body 71, so as to avoid the connecting rod body 71 from swinging left and right when it is placed between the two first ear plates 85.

[0029] like Figure 2 As shown, in one embodiment, the number of the second ear plates 91 is two and they are arranged on both sides of the outer wall of the bucket 9, the outer wall of the second ear plate 91 is provided with a second groove 93, a fixed flange plate 94 is provided in the second groove 93, the baffle plate 96 is detachably connected to the fixed flange plate 94 by bolts 98, a second bearing 95 for passing the second pin shaft 736 is provided between the baffle plate 96 and the fixed flange plate 94, and a gasket 97 is provided on the outer wall of the bolt 98.

[0030] Specifically, there are two second ear plates 91. When it is necessary to fix the position of the connecting rod body 71 and the bucket 9, the second pin shaft 736 is moved to one side of the second bearing 95. At this time, the outer flange plate 83 moves to the inside of the second groove 93, and the fixed flange plate 94 and the second bearing 95 are both located on one side of the second groove 93. Then the driving mechanism 73 pushes the two second pin shafts 736 away from each other, thereby pushing the two second pin shafts 736 to pass through the two fixed flange plates 94 respectively and move to the inside of the second bearing 95. At this time, the second pin shaft 736 is simultaneously located between the connecting rod body 71, the first ear plate 85 and the second ear plate 91, so as to fix the position of the bucket 5 and the bucket 9; optionally, the position of the fixed flange plate 94 is fixed by a baffle 96, and the two are detachably connected by bolts 98, and a gasket 97 is used to protect the bolts 98.

[0031] like Figure 8-Figure 19 As shown, in one embodiment, a rear axle seat 713 is symmetrically provided on one side of the outer wall of the connecting rod body 71, a support plate 712 for fixing the driving mechanism 73 is provided between the two rear axle seats 713 on the outer wall of the connecting rod body 71, a protective plate 72 is provided on the outer wall of the connecting rod body 71 on the outer side of the driving mechanism 73, and the driving mechanism 73 includes an oil cylinder 731, and the oil cylinder 731 is arranged on the support plate 712, and the output end of the oil cylinder 731 is provided with a first guide plate 732 and a second guide plate 737, and two second pins 736 They are respectively slidably connected with the two rear axle seats 713, and the adjacent ends of the two second pin shafts 736 are slidably connected. A fixing bolt 733 is provided on one side of the outer wall of the second pin shaft 736. A sleeve 735 is sleeved on the outer wall of the fixing bolt 733. A pad 734 is provided on the outer wall of the sleeve 735. A first guide groove 738 is provided on the first guide plate 732, and a second guide groove 739 is provided on the second guide plate 737. The two sleeves 735 are respectively slidably connected with the first guide groove 738 and the second guide groove 739.

[0032] When the two second pin shafts 736 need to be pushed away from each other, the oil cylinder 731 on the control support plate 712 is operated, and the oil cylinder 731 drives the first guide plate 732 and the second guide plate 737 to move toward the rear axle seat 713. The two second pin shafts 736 are slidably connected with the two rear axle seats 713 respectively, thereby guiding the second pin shafts 736. When the first guide plate 732 and the second guide plate 737 move, the relative positions of the two sleeves 735 and the first guide groove 738 and the second guide groove 739 are changed, thereby pushing the two second pin shafts 736 away from each other. The sleeve 735 is sleeved on the outer wall of the fixing bolt 733, reducing In order to reduce the friction loss between the fixing bolt 733 and the first guide groove 738 and the second guide groove 739, the two pads 734 are respectively located on one side of the first guide plate 732 and the second guide plate 737, and play a certain positioning role; the cylinder 731 drives the first guide plate 732 and the second guide plate 737 to return to their original positions, thereby driving the two second pin shafts 736 to approach each other, so as to facilitate the separation of the first ear plate 85 and the second ear plate 91; the present invention cooperates with the cylinder 731, the first guide plate 732 and the second guide plate 737. When the cylinder 731 fails, the second pin shaft 736 will not retract, thereby ensuring that the quick-change bracket 8 and the bucket 9 will not separate by themselves, and the safety is high.

[0033] In one embodiment, the protection plate 72 includes a sealing plate 721, a first mounting plate 711 is provided on the support plate 712, a second mounting plate 714 is provided between the two rear axle seats 713, the sealing plate 721 is detachably connected to the first mounting plate 711 and the second mounting plate 714, and an anti-collision block 722 is provided on one side of the outer wall of the sealing plate 721.

[0034] Specifically, the sealing plate 721 is detachably connected to the support plate 712 via the first mounting plate 711 and the second mounting plate 714 , and the anti-collision block 722 is used to protect the sealing plate 721 and the connecting rod body 71 , thereby ensuring the stability of the structure of the present invention. Embodiment 2:

[0035] The present invention provides an excavator, comprising the quick-change device described in the first embodiment.

[0036] 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 quick change device, characterized in that: It comprises a bucket (5) and a bucket (9), wherein one end of the bucket (5) is provided with a rotatably connected quick-change bracket (8), an outer wall of the bucket (5) is provided with a rotatably connected rocker (4), the quick-change bracket (8) and the rocker (4) are rotatably connected to a same connecting rod mechanism (7), and the connecting rod mechanism (7) and the bucket (5) are rotatably connected to a same power mechanism (6); The quick-change bracket (8) comprises a first ear plate (85), an outer wall of the first ear plate (85) is provided with a first pin shaft (88), the first ear plate (85) is rotatably connected to the bucket arm (5) via the first pin shaft (88), the connecting rod mechanism (7) comprises a connecting rod body (71), an outer wall of the connecting rod body (71) is symmetrically provided with second pin shafts (736) in sliding connection, a driving mechanism (73) is provided in the connecting rod body (71) for pushing two second pin shafts (736) towards or away from each other, the first ear plate (85) is rotatably connected to the connecting rod body (71) via one of the second pin shafts (736), the bucket (9) is provided with a second ear plate (91), the second ear plate (91) is provided with a first groove (92) for accommodating the first pin shaft (88), and the second ear plate (91) is provided with a baffle (96) for passing one of the second pin shafts (736).

2. The quick-change device according to claim 1, characterized in that: The number of the first ear plates (85) is two, a bent plate (82) is provided between the two first ear plates (85), and the first pin shaft (88) is provided between the two first ear plates (85).

3. The quick-change device according to claim 2, characterized in that: An outer wall of the first ear plate (85) is provided with an axis flange plate (87) outside the first pin shaft (88), and the axis flange plate (87) is detachably connected to the first ear plate (85) via a pin (86).

4. The quick-change device according to claim 1, characterized in that: An inner flange plate (81) and an outer flange plate (83) are respectively provided on both sides of the outer wall of the first ear plate (85), and a first bearing (84) for passing the second pin shaft (736) is provided between the inner flange plate (81), the first ear plate (85) and the outer flange plate (83).

5. The quick-change device according to claim 1, characterized in that: The number of the second ear plates (91) is two and they are arranged on both sides of the outer wall of the bucket (9); the outer wall of the second ear plate (91) is provided with a second groove (93); a fixed flange plate (94) is arranged in the second groove (93); the baffle plate (96) is detachably connected to the fixed flange plate (94) by bolts (98); and a second bearing (95) for passing the second pin shaft (736) is arranged between the baffle plate (96) and the fixed flange plate (94).

6. The quick-change device according to claim 5, characterized in that: A gasket (97) is sleeved on the outer wall of the bolt (98).

7. The quick-change device according to claim 1, characterized in that: A rear axle seat (713) is symmetrically provided on one side of the outer wall of the connecting rod body (71), a support plate (712) for fixing the driving mechanism (73) is provided between the two rear axle seats (713) on the outer wall of the connecting rod body (71), and a protective plate (72) is provided on the outer side of the driving mechanism (73) on the outer wall of the connecting rod body (71).

8. The quick-change device according to claim 7, characterized in that: The driving mechanism (73) comprises an oil cylinder (731), wherein the oil cylinder (731) is arranged on the support plate (712), and a first guide plate (732) and a second guide plate (737) are provided at the output end of the oil cylinder (731), and two second pin shafts (736) are respectively slidably connected to the two rear axle seats (713), and adjacent ends of the two second pin shafts (736) are slidably connected, and a fixing bolt (733) is provided on one side of the outer wall of the second pin shaft (736), and a sleeve (735) is sleeved on the outer wall of the fixing bolt (733), and a pad (734) is provided on the outer wall of the sleeve (735), and a first guide groove (738) is provided on the first guide plate (732), and a second guide groove (739) is provided on the second guide plate (737), and the two sleeves (735) are respectively slidably connected to the first guide groove (738) and the second guide groove (739).

9. The quick-change device according to claim 7, characterized in that: The protection plate (72) comprises a sealing plate (721), a first mounting plate (711) is provided on the support plate (712), a second mounting plate (714) is provided between the two rear axle seats (713), the sealing plate (721) is detachably connected to both the first mounting plate (711) and the second mounting plate (714), and an anti-collision block (722) is provided on one side of the outer wall of the sealing plate (721).

10. An excavator, characterized in that: Comprising the quick-change device according to any one of claims 1 to 9.

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