An expansion implement, work device, and construction machine

Abstract

The application discloses a kind of expansion machine tools, working devices and engineering machinery, including expansion machine tool main body, arc bracing plate assembly and telescopic component;Expansion machine tool main body is hollow box structure, and multiple articulated ends are configured on the geometric profile outside it;Arc bracing plate assembly is articulated together with expansion machine tool main body to form beak shape structure, and the front end sharp nose part is easily inserted into the crack of hard material after being closed;Telescopic component is arranged in the inner cavity of expansion machine tool main body, and one end thereof is articulated with expansion machine tool main body, and the other end thereof is articulated with arc bracing plate assembly, and when telescopic component is in fully retracted state, arc bracing plate assembly is closed in the inner cavity of expansion machine tool main body, and as telescopic component gradually elongates outward, arc bracing plate assembly gradually expands outward around hinge point.The application can quickly separate materials, and is simple, economical and practical, and can be used by replacing machine tool on existing excavator, which is simple and fast.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, and specifically relates to an expansion tool. Background Technology

[0002] With increasingly stringent environmental regulations, the use of explosives in quarrying is strictly prohibited, leading to the growing use of rock splitters, cutters, and other similar equipment. However, these machines can only create a single crack in medium to large-sized rocks, requiring further separation using excavator buckets or other machinery to facilitate subsequent rock handling. Currently, using excavator buckets for rock separation suffers from low efficiency, high equipment wear and tear, and short lifespan. There is an urgent need to invent a more efficient and reliable separation mechanism. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention discloses an expansion tool that can quickly separate materials. It is simple, economical, and practical, and can be used simply by replacing the tool on an existing excavator.

[0004] This invention is implemented according to the following technical solution: In a first aspect, the present invention discloses an expansion device, comprising: The main body of the expansion machine is a hollow box-shaped structure with multiple hinged ends configured on its external geometric contour. The arc-shaped support plate assembly is hinged together with the main body of the expansion tool to form a beak-shaped structure. When the two are closed, the pointed tip at the front end is easy to insert into the crack of a hard object. The telescopic component is arranged in the inner cavity of the main body of the expansion tool. One end of the component is hinged to the main body of the expansion tool, and the other end is hinged to the arc-shaped support plate assembly. When the telescopic component is in the fully retracted state, the arc-shaped support plate assembly is closed in the inner cavity of the main body of the expansion tool. As the telescopic component gradually extends outward, the arc-shaped support plate assembly gradually expands outward around the hinge point.

[0005] In some embodiments, the expansion device body has the following components: The box is used to hold the arc-shaped support plate assembly and telescopic components. The width of the external geometric profile of the box gradually decreases from back to front until the front end is a pointed structure. The side of the box that forms an opening and closing with the arc-shaped support plate assembly is a convex arc-shaped surface. A hinged base installed inside the housing for connection with telescopic components; A top mount for hinged connection with the rocker arm and connecting rod and mounted at the rear of the housing.

[0006] In some embodiments, the housing includes: A top plate, wherein the top seat is mounted on one side of the top plate; A pair of opposing main boards are installed on the other side of the top plate. The width of the main boards gradually decreases from back to front until the front end is a pointed structure. The side of the top plate that forms a tension with the arc-shaped support plate assembly is an outwardly convex arc-shaped surface. Each of the two main boards has a coaxial hinge hole between its arc-shaped surface and its rear wide side for assembling the arc-shaped support plate assembly. A pair of opposing vertical plates I are installed on the inner sides of the two main plates and are also connected to the top plate; The base plate is installed between the two upright plates I at the end away from the top plate, and the hinge seat is installed on the base plate between the two upright plates I; A reinforcing plate that connects the two motherboards and is located below the base plate.

[0007] In some embodiments, the hinge base consists of a pair of opposing vertical plates II, each of the two vertical plates II having a coaxial hinge hole, and a bearing seat is installed at the hinge hole; the hinge end of the telescopic component is inserted between the two vertical plates II, and the shaft with a baffle at one end passes sequentially through the main board, vertical plate I, vertical plate II, bearing seat, telescopic component on one side and the bearing seat, vertical plate II, vertical plate I, and main board on the other side, and then the baffle is fixed to the main board by bolts.

[0008] In some embodiments, the top seat includes: The base plate installed on the top plate; A pair of hinge plates facing each other are installed at both ends of the base plate, and the hinge plates are arranged parallel to the main plate. Each of the two hinge plates has two coaxial hinge holes, one set of hinge holes is used to assemble the connecting rod, and the other set of hinge holes is used to assemble the boom. The middle connecting plate is connected to the hinge plates on both sides.

[0009] In some embodiments, the housing has an outer sealing plate detachably connected to the opening face away from the arcuate support assembly to facilitate the installation and maintenance of the telescopic components.

[0010] In some embodiments, the arcuate support assembly has the following components: The housing is used to hinge with the body of the expansion tool and the telescopic components. The width of the outer geometric profile of the housing gradually decreases from back to front until the front end is a pointed structure. The inner surface of the housing that forms an opening and closing with the body of the expansion tool is a concave arc surface, and the outer surface is a convex arc surface. Hinged component I, installed in the middle of the housing and used to connect with the telescopic component; Hinged component II, which is hinged to the main body of the expansion machine and installed at the rear of the housing.

[0011] In some embodiments, the housing includes: A pair of opposing arc-shaped plates, the width of which gradually decreases from back to front until the front end is a pointed structure. The inner surface of the arc-shaped plates that forms an opening and closing with the body of the expansion tool is a concave arc-shaped surface, and the outer surface is a convex arc-shaped surface. Each of the two arc-shaped plates has a coaxial hinge hole on its rear wide side. The connecting plate is installed between the inner sides of the two curved plates and is connected together along the edge of the outwardly convex curved surface.

[0012] In some embodiments, the outer surface of the connecting plate is provided with a plurality of wear-resistant plates arranged at intervals and protruding from the arc-shaped plates.

[0013] In some embodiments, the hinge component I has the following components: Each of the two arc-shaped plates has a coaxial hinge hole in the middle, a bearing seat is provided inside the hinge hole, and a stop sleeve is provided outside one of the hinge holes. The shaft passes sequentially through the arc plate, shaft seat, and telescopic component on one side, and the shaft seat, arc plate, and stop sleeve on the other side, and is then fixed to the stop sleeve by bolts and nuts.

[0014] In some embodiments, the hinge component II has the following components: A connecting seat is installed between two hinge holes on the rear wide side of the arc plate, and a bearing seat is installed on the outer side of each of the two hinge holes. The shaft passes sequentially through the main board, shaft seat, arc plate, and connecting seat of the expansion machine body on one side, and the arc plate, shaft seat, main board of the expansion machine body, and stop sleeve on the other side, and is then fixed to the stop sleeve by bolts and nuts.

[0015] In some embodiments, the telescopic component is a hydraulic cylinder, the cylinder body of which is hinged to the main body of the expansion device, and the piston rod is hinged to the arc-shaped support plate assembly.

[0016] Secondly, the present invention discloses a working device, including a boom, a stick, a rocker arm, a connecting rod, and the aforementioned expansion device; the boom is raised and lowered by extending and retracting a boom cylinder connected to a turntable; the boom is connected to the stick by a pin, and the stick rotates around the pin by extending and retracting a stick cylinder; the expansion device is connected to the stick by a pin, and simultaneously connected to the connecting rod by a pin, the expansion device, the stick, the connecting rod, and the rocker arm form a four-bar linkage mechanism, the device cylinder is connected to the connecting rod and the rocker arm by a pin, and the expansion device rotates around the pin on the stick by extending and retracting the device cylinder.

[0017] Thirdly, the present invention discloses an engineering machine equipped with the aforementioned expansion tool; or, equipped with the aforementioned working device.

[0018] Compared with the prior art, the present invention has the following advantages: The expansion tool has a beak-shaped structure, and the pointed part is easy to insert into cracks in stones, etc. The arc-shaped support plate assembly is expanded by adjusting the hydraulic cylinder. After the cylinder is fully retracted, the outer contour of the arc-shaped support plate assembly coincides with the outer contour of the main board of the expansion machine. The arc-shaped support plate assembly and the main body of the expansion mechanism are designed as a box structure, which has a large load-bearing capacity and high reliability; The outer sealing plate is bolted to the rear end of the expansion machine body, which facilitates the installation and maintenance of the hydraulic cylinder. Attached Figure Description

[0019] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0020] In the attached diagram: Figure 1 This is a schematic diagram of the installation of the expansion device of the present invention; Figure 2 Explosion diagram of the expansion device of the present invention Figure 1 ; Figure 3 Explosion diagram of the expansion device of the present invention Figure 2 ; Figure 4 This is a schematic diagram of the expansion mechanism of the present invention; Figure 5 This is a schematic diagram of the movement of the expansion mechanism of the present invention.

[0021] Explanation of reference numerals in the attached drawings: 1. Main body of the expansion tool; 2. Arc-shaped support plate assembly; 3. Outer sealing plate; 4. Shaft; 5. Shaft; 6. Shaft; 7. Hydraulic cylinder; 1-1. Top seat; 1-2. Top plate; 1-3. Shaft seat; 1-4. Vertical plate; 1-5. Base plate; 1-6. Vertical plate; 1-7. Reinforcing plate; 1-8. Main plate; 1-9. Stop sleeve; 2-1. Connecting plate; 2-2. Arc-shaped plate; 2-3. Wear-resistant plate; 2-4. Stop sleeve; 2-5. Shaft seat; 2-6. Connecting seat; 2-7. Shaft seat; 100-Boom; 200-Stick; 300-Rock arm; 400-Connecting rod; 500-Expansion tool; 600-Tool cylinder.

[0022] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] like Figure 2 , Figure 3 , Figure 4 As shown, an expansion device includes an expansion device body 1, an arc-shaped support plate assembly 2, and a telescopic component. The expansion device body 1 is a hollow box-shaped structure with multiple hinged ends arranged on its external geometric contour. The arc-shaped support plate assembly 2 is hinged to the expansion device body 1 to form a beak-shaped structure. When the two are closed, the pointed tip at the front end is easy to insert into the crack of a hard object. The telescopic component is arranged in the inner cavity of the expansion device body 1. One end of the component is hinged to the expansion device body 1, and the other end is hinged to the arc-shaped support plate assembly 2. When the telescopic component is in a fully retracted state, the arc-shaped support plate assembly 2 is closed in the inner cavity of the expansion device body 1. As the telescopic component gradually extends outward, the arc-shaped support plate assembly 2 gradually expands outward around the hinge point.

[0027] The following is a preferred embodiment of the above-described expansion tool body: Continue to refer to Figure 2 , Figure 3 , Figure 4 As shown, the main body 1 of the expansion machine includes a top seat 1-1, a top plate 1-2, a shaft seat 1-3, a vertical plate 1-4, a bottom plate 1-5, a vertical plate 1-6, a reinforcing plate 1-7, a main plate 1-8, and a stop sleeve 1-9.

[0028] The top plate 1-1 is installed on one side of the top plate 1-2; a pair of opposing main plates 1-8 are installed at both ends of the other side of the top plate 1-2. The width of the main plates 1-8 gradually decreases from back to front until the front end is a pointed structure. The side of the top plate 1-2 that forms a tension with the arc-shaped support plate assembly 2 is a convex arc surface. Each of the arc surfaces of the two main plates 1-8 and their rear wide side surfaces is provided with a coaxial hinge hole for assembling the arc-shaped support plate assembly 2; a pair of opposing vertical plates 1-6 are respectively installed on the inner sides of the two main plates 1-8 and are also connected to the top plate 1-2; the bottom plate 1-5 is installed between the two vertical plates 1-6 and at the end away from the top plate 1-2. The hinge seat is installed on the bottom plate 1-5 between the two vertical plates 1-6; the reinforcing plate 1-7 is connected between the two main plates 1-8 and located below the bottom plate 1-5.

[0029] A further solution: The hinged base consists of a pair of opposing upright plates 1-4. Each of the two upright plates 1-4 has a coaxial hinge hole, and a bearing seat 1-3 is installed at the hinge hole. The hinged end of the telescopic component is inserted between the two upright plates 1-4. The shaft 4 with a baffle at one end passes through the main plate 1-8, upright plate 1-6, upright plate 1-4, bearing seat 1-3, telescopic component on one side and bearing seat 1-3, upright plate 1-4, upright plate 1-6, and main plate 1-8 on the other side, and then the baffle is fixed to the main plate 1-8 by bolts.

[0030] A further embodiment: The top mount 1-1 includes a base plate, a hinge plate, and an intermediate connecting plate mounted on the top plate; a pair of hinge plates opposite each other are mounted on both ends of the base plate, and the hinge plates are arranged parallel to the main plate 1-8. Each of the two hinge plates is provided with two coaxial hinge holes, one set of hinge holes is used to assemble the connecting rod, and the other set of hinge holes is used to assemble the boom; the intermediate connecting plate is connected to the two side hinge plates.

[0031] A further solution: The main body 1 of the expansion device has an outer sealing plate 3 detachably connected to the opening surface away from the arc-shaped support plate assembly 2, facilitating the installation and maintenance of the telescopic components. Specifically, the outer sealing plate 3 is connected to the top plate 1-2, the bottom plate 1-5, and the two vertical plates 1-6 by bolts and washers. The outer sealing plate 3 has countersunk bolt holes, and the bolt heads do not protrude from the surface of the outer sealing plate to avoid damage to the bolt heads.

[0032] The following is a preferred embodiment of the above-described curved support plate assembly: Continue to refer to Figure 2 , Figure 3 , Figure 4 As shown, the arc-shaped support plate assembly includes a connecting plate 2-1, an arc-shaped plate 2-2, a wear-resistant plate 2-3, a stop sleeve 2-4, a bearing seat 2-5, a connecting seat 2-6, and a bearing seat 2-7.

[0033] The width of a pair of opposing arc-shaped plates 2-2 gradually decreases from back to front until the front end is a pointed structure. The inner surface of the arc-shaped plate 2-2 that forms an opening with the body 1 of the expansion tool is a concave arc-shaped surface, and the outer surface is a convex arc-shaped surface. Each of the two arc-shaped plates 2-2 has a coaxial hinge hole on its rear wide side. The connecting plate 2-6 is installed between the inner sides of the two arc-shaped plates 2-2 and is connected together along the edge of the convex arc-shaped surface.

[0034] Each of the two arc-shaped plates 2-2 has a coaxial hinge hole in the middle. A bearing seat 2-7 is provided inside the hinge hole, and a stop sleeve 2-4 is provided outside one of the hinge holes. The shaft 6 passes through the arc-shaped plate 2-2, bearing seat 2-7, telescopic component on one side and the bearing seat 2-7, arc-shaped plate 2-2, and stop sleeve 2-4 on the other side in sequence, and is then fixed to the stop sleeve 2-4 by bolts and nuts.

[0035] A connecting seat 2-6 is installed between two hinge holes on the rear wide side of the arc plate 2-2, and a bearing seat 2-5 is installed on the outer side of each of the two hinge holes; the shaft 5 passes through the main plate 1-8, bearing seat 2-7, arc plate 2-2, connecting seat 2-6 on one side and the arc plate 2-2, bearing seat 2-5, main plate 1-8, and stop sleeve 1-9 on the other side in sequence, and is then fixed to the stop sleeve 1-9 by bolts and nuts.

[0036] A further solution: multiple wear-resistant plates 2-3 are provided on the outer surface of the connecting plate 2-6, which are spaced apart and protrude from the arc-shaped plate.

[0037] A further solution: The telescopic component is a hydraulic cylinder 7, whose cylinder body is hinged to the main body 1 of the expansion tool, and the piston rod is hinged to the arc-shaped support plate assembly 2.

[0038] As shown above, the expansion device has a beak-shaped structure, with the pointed end inserted into the cracks of stones or other objects. The device expands by adjusting the hydraulic cylinder connected to the arc-shaped support plate assembly, separating the stones or other objects. To improve the reliability of the expansion device, both the arc-shaped support plate assembly and the main body of the expansion device are designed as a box structure. For ease of installation and maintenance of the hydraulic cylinder, the rear end of the expansion device is designed with an outer sealing plate connected by bolts.

[0039] The following is an application example of the above embodiments regarding the expansion device: like Figure 1 , Figure 5As shown, a working device includes a boom 100, a stick 200, a rocker arm 300, a connecting rod 400, and the aforementioned expansion device 500. The boom 100 raises and lowers via a boom cylinder connected to a turntable. The boom 100 is connected to the stick 200 by a pin, and the stick 200 rotates around the pin via a stick cylinder. The expansion device 500 is connected to the stick 200 by a pin, and also to the connecting rod 400 by a pin. The expansion device 500, stick 200, connecting rod 400, and rocker arm 300 form a four-bar linkage. The expansion device cylinder 600 is connected to the connecting rod 400 and rocker arm 300 by a pin. The expansion device 500 rotates around the pin on the stick via the extension and retraction of the expansion device cylinder 600. The tip of the expansion device is inserted into the crack of the stone to be separated. As the crack widens, the expansion device gradually inserts downwards until the stone is separated.

[0040] The following is an application example of the working device described in the above embodiments: An excavator equipped with the aforementioned working device.

[0041] It should be noted that, in addition to the working devices mentioned above, excavators also include a power unit, a traveling device, and a slewing device.

[0042] Excavators are typically powered by diesel engines, which are fixed to the turntable via vibration damping devices to provide power for their traveling mechanism, slewing mechanism, and working mechanism.

[0043] The excavator's traveling mechanism supports the excavator's overall weight and performs its traveling tasks; it is mostly tracked or wheeled.

[0044] The excavator's slewing mechanism allows the upper section to rotate left or right for digging and unloading.

[0045] The excavator's hydraulic system transmits the power output from the engine to the working device and traveling device.

[0046] The electrical system of an excavator mainly detects the temperature, pressure, speed, and switching quantities of the engine, hydraulic pump, main valve, and actuators (hydraulic cylinders, hydraulic motors), and transmits the relevant detection data to the excavator's dedicated controller. The controller integrates various measured values, set values, and operating signals to issue relevant control information to control the engine, hydraulic pump, main valve, and the entire machine.

[0047] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0048] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An expansion device, characterized in that, include: The main body of the expansion machine is a hollow box-shaped structure with multiple hinged ends configured on its external geometric contour. The arc-shaped support plate assembly is hinged together with the main body of the expansion tool to form a beak-shaped structure. When the two are closed, the pointed tip at the front end is easy to insert into the crack of a hard object. A telescopic component is arranged in the inner cavity of the main body of the expansion tool. One end of the component is hinged to the main body of the expansion tool, and the other end is hinged to the arc-shaped support plate assembly. When the telescopic component is in a fully retracted state, the arc-shaped support plate assembly is closed in the inner cavity of the main body of the expansion tool. As the telescopic component gradually extends outward, the arc-shaped support plate assembly gradually expands outward around the hinge point. The main body of the expansion device has the following components: Box I is used to hold the arc-shaped support plate assembly and telescopic components. The width of the external geometric profile of box I gradually decreases from back to front until the front end is a pointed structure. The side of box I that forms an opening and closing with the arc-shaped support plate assembly is a convex arc-shaped surface. A hinged seat installed inside housing I for connection with telescopic components; A top mount for hinged connection with the rocker arm and connecting rod and installed at the rear of the housing I; The arc-shaped support plate assembly has the following components: The box II is used to hinge with the body of the expansion machine and the telescopic component. The width of the external geometric contour of the box II gradually decreases from back to front until the front end is a pointed structure. The inner surface of the box II that forms an opening and closing with the body of the expansion machine is a concave arc surface, and the outer surface is a convex arc surface. Hinged component I, installed in the middle of housing II and used to connect with telescopic components; Hinged component II is used to hinge to the main body of the expansion machine and is installed behind the housing II.

2. The expansion device according to claim 1, characterized in that, The housing I includes: A top plate, wherein the top seat is mounted on one side of the top plate; A pair of opposing main boards are installed on the other side of the top plate. The width of the main boards gradually decreases from back to front until the front end is a pointed structure. The side of the top plate that forms a tension with the arc-shaped support plate assembly is an outwardly convex arc-shaped surface. Each of the two main boards has a coaxial hinge hole between its arc-shaped surface and its rear wide side for assembling the arc-shaped support plate assembly. A pair of opposing vertical plates I are installed on the inner sides of the two main plates and are also connected to the top plate; The base plate is installed between the two upright plates I at the end away from the top plate, and the hinge seat is installed on the base plate between the two upright plates I; A reinforcing plate that connects the two motherboards and is located below the base plate.

3. An expansion device according to claim 2, characterized in that: The hinge seat consists of a pair of opposing vertical plates II, each of which has a coaxial hinge hole and a bearing seat is installed at the hinge hole. The hinged end of the telescopic component is inserted between the two upright plates II. The shaft with a baffle at one end passes through the main board, upright plate I, upright plate II, shaft seat, telescopic component on one side and the shaft seat, upright plate II, upright plate I, and main board on the other side in sequence, and then the baffle is fixed to the main board by bolts.

4. An expansion device according to claim 2, characterized in that, The top seat includes: The base plate installed on the top plate; A pair of hinge plates facing each other are installed at both ends of the base plate, and the hinge plates are arranged parallel to the main plate. Each of the two hinge plates has two coaxial hinge holes, one set of hinge holes is used to assemble the connecting rod, and the other set of hinge holes is used to assemble the boom. The middle connecting plate is connected to the hinge plates on both sides.

5. An expansion device according to claim 1, characterized in that: The housing I has an outer sealing plate that is detachably connected to the opening surface away from the arc-shaped support plate assembly, facilitating the installation and maintenance of the telescopic components.

6. An expansion device according to claim 1, characterized in that, The housing II includes: A pair of opposing arc-shaped plates, the width of which gradually decreases from back to front until the front end is a pointed structure. The inner surface of the arc-shaped plates that forms an opening and closing with the body of the expansion tool is a concave arc-shaped surface, and the outer surface is a convex arc-shaped surface. Each of the two arc-shaped plates has a coaxial hinge hole on its rear wide side. The connecting plate is installed between the inner sides of the two curved plates and is connected together along the edge of the outwardly convex curved surface.

7. An expansion device according to claim 6, characterized in that: The outer surface of the connecting plate is provided with multiple wear-resistant plates that are spaced apart and protrude from the arc-shaped plates.

8. An expansion device according to claim 7, characterized in that, The hinge component I has the following components: Each of the two arc-shaped plates has a coaxial hinge hole in the middle, a bearing seat is provided inside the hinge hole, and a stop sleeve is provided outside one of the hinge holes. The shaft passes sequentially through the arc plate, shaft seat, and telescopic component on one side, and the shaft seat, arc plate, and stop sleeve on the other side, and is then fixed to the stop sleeve by bolts and nuts.

9. An expansion device according to claim 7, characterized in that, The hinge component II has the following components: A connecting seat is installed between two hinge holes on the rear wide side of the arc plate, and a bearing seat is installed on the outer side of each of the two hinge holes. The shaft passes sequentially through the main board, shaft seat, arc plate, and connecting seat of the expansion machine body on one side, and the arc plate, shaft seat, main board of the expansion machine body, and stop sleeve on the other side, and is then fixed to the stop sleeve by bolts and nuts.

10. An expansion device according to claim 1, characterized in that: The telescopic component is a hydraulic cylinder, with its cylinder body hinged to the main body of the expansion tool and its piston rod hinged to the arc-shaped support plate assembly.

11. A working device, comprising a boom, a stick, a rocker arm, and a connecting rod, characterized in that: It also includes the expansion apparatus as described in any one of claims 1 to 10; The boom is raised and lowered by extending and retracting a boom cylinder connected to the turntable. The boom and stick are connected by a pin, and the stick rotates around the pin by the extension and retraction of the stick cylinder. The expansion device is connected to the boom with a pin, and the expansion device is also connected to the connecting rod with a pin. The expansion device, boom, connecting rod, and rocker arm form a four-bar linkage mechanism. The device cylinder is connected to the connecting rod and rocker arm with a pin. Through the extension and retraction of the device cylinder, the expansion device can rotate around the pin on the boom.

12. An engineering machinery, characterized in that: It is equipped with an expansion device as described in any one of claims 1 to 10; or, it is equipped with a working device as described in claim 11.

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