Composite grouting device based on post-grouting process and assembling device thereof

Abstract

The application discloses a composite grouting device based on a post-grouting process and an assembling device thereof, and relates to the technical field of engineering construction equipment, which comprises a pair of vertical grouting pipes and an annular grouting pipe arranged between the pair of vertical grouting pipes; the pair of vertical grouting pipes and the annular grouting pipe are connected through a four-way connecting piece; and a variable-diameter mechanism is arranged between the four-way connecting piece and the annular grouting pipe. The vertical grouting pipe and the annular grouting pipe are combined for use, so that the uniformity of the distribution of grout in a pile column during grouting can be significantly improved, and the overall quality of the pile column is improved; the Venturi tube structure constructed by the mounting ring, the connecting ring and the spring sheet is specially used for covering the interface area between the annular grouting pipe and the four-way connecting piece; the grout can be effectively prevented from directly impacting the interface, and the risk of interface loosening is reduced; meanwhile, the outlet diameter of the Venturi tube structure gradually increases when the grout flows through, so that the flow velocity is slowed down, and the impact force on the annular grouting pipe is further reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering construction equipment, in particular to a composite grouting device based on a post-grouting process and an assembling device thereof. BACKGROUND

[0002] The grouting device is a special device for injecting cement slurry or chemical slurry into strata, concrete gaps or pipeline leaks.

[0003] In the prior art, when performing pile pouring operations, construction teams usually adopt two main grouting pipe arrangement methods: vertical grouting pipes and annular grouting pipes; the vertical grouting pipes refer to pipe systems vertically installed along the center line of the pile or close to the center; and the annular grouting pipes refer to one or more circles of pipes arranged horizontally around the pile.

[0004] However, the pouring pipe structure of the grouting device still has the following defects in use:

[0005] For a pile structure with a large diameter, only relying on vertical grouting pipes or annular grouting pipes may not ensure uniform distribution of the slurry during pouring, which may adversely affect the quality of the final pile; this is because, under the condition of a large diameter, a single type of grouting method is difficult to cover the entire cross section, which is likely to cause insufficient filling or excessive filling in some areas, thereby forming cavities, cracks and other problems, affecting the quality of the pile. SUMMARY

[0006] In order to overcome the above technical problems, the purpose of the present application is to provide a composite grouting device based on a post-grouting process and an assembling device thereof, which solves the problem that the grouting pipe structure of the existing grouting device cannot ensure uniform distribution of the slurry during pouring.

[0007] The purpose of the present application can be achieved by the following technical solutions:

[0008] The composite grouting device based on the post-grouting process comprises a pair of vertical grouting pipes and an annular grouting pipe arranged between the pair of vertical grouting pipes; the pair of vertical grouting pipes and the annular grouting pipe are connected through a four-way connector; a variable diameter mechanism is arranged between the four-way connector and the annular grouting pipe; the variable diameter mechanism comprises:

[0009] a mounting ring inserted into the connecting port of the four-way connector;

[0010] a connecting ring inserted into the connecting port of the annular grouting pipe;

[0011] a plurality of spring sheets arranged between the mounting ring and the connecting ring;

[0012] And a connecting rod, one end of the connecting rod is fixedly arranged on the mounting ring, and the other end of the connecting rod is fixedly arranged at the connecting port position of the annular grouting pipe.

[0013] Preferably, the variable diameter mechanism further comprises a plurality of first clamping blocks; the plurality of first clamping blocks are arranged on the mounting ring, and a first clamping groove matched with the first clamping blocks is arranged in the four-way connector; when the connecting port of the connecting hose is inserted into the four-way connector, the first clamping blocks are clamped in the first clamping groove.

[0014] Preferably, the variable diameter mechanism further comprises an elastic cloth; the elastic cloth is arranged between adjacent spring sheets.

[0015] Preferably, the spring sheet is in an arc-shaped structure, and the mounting ring, the spring sheet, the elastic cloth and the connecting ring form a Venturi tube structure; when the internal pressure of the Venturi tube structure increases, the spring sheet is deformed to change the minimum inner diameter of the Venturi tube structure.

[0016] Preferably, the vertical grouting pipe comprises a connecting section and a grouting section with a grouting hole; the connecting section is connected to the top of the four-way connector, and the grouting section is connected to the bottom of the four-way connector.

[0017] Preferably, the annular grouting pipe comprises two half-circular connecting hoses with connecting heads; the two connecting hoses are connected to the four-way connector through the connecting heads, and the two connecting hoses and the four-way connector form a circular structure.

[0018] Preferably, a second clamping block is arranged on the connecting head, and a second clamping groove matched with the second clamping block is arranged in the four-way connector; when the connecting head is connected to the four-way connector, the second clamping block is clamped in the second clamping groove.

[0019] The assembling device of the composite grouting device based on the post-grouting process comprises an assembling seat and an assembling mechanism arranged on the assembling seat; the assembling mechanism drives the annular grouting pipe and the four-way connector to assemble and splice; a pair of limiting grooves matched with the four-way connector are arranged on the assembling seat.

[0020] Preferably, the assembling mechanism comprises a driving mechanism and a pair of first rotating rods; the pair of first rotating rods are rotatably connected to the assembling seat at the midpoint position through a pin shaft; a clamping block is arranged at each end of the first rotating rod, and a clamping groove matched with the clamping block is arranged on the connecting head; the driving mechanism is installed on the assembling seat; when the connecting head is clamped on the clamping block through the clamping groove, the driving mechanism is used to drive the first rotating rod to rotate, so as to drive the connecting head to be inserted into the four-way connector.

[0021] Preferably, the driving mechanism comprises a cylinder, a mounting block and a pair of second rotating rods; the cylinder is mounted on the assembling seat, the mounting block is mounted on the output end of the cylinder, one end of the pair of second rotating rods is respectively hinged to the two sides of the mounting block, and the other end of the pair of second rotating rods is respectively hinged with the pair of first rotating rods; when the cylinder drives the mounting block to move, the pair of first rotating rods is driven to rotate along the pin shaft position through the second rotating rods.

[0022] The beneficial effects of the present application are:

[0023] 1. By setting the combination of vertical grouting pipes and annular grouting pipes, the uniformity of the distribution of slurry in the pile during the grouting process can be significantly improved, thereby improving the overall quality of the pile;

[0024] 2. The Venturi tube structure constructed by the mounting ring, the connecting ring and the spring sheet is specially used to cover the interface area between the annular grouting pipe and the four-way connecting piece; it can effectively prevent the slurry from directly impacting the interface and reduce the risk of interface loosening; at the same time, the Venturi tube structure makes the outlet diameter gradually increase when the slurry flows through, thereby slowing down the flow rate and further reducing the impact force on the annular grouting pipe; this not only protects the annular grouting pipe from damage, but also ensures the safety and stability of the entire grouting process;

[0025] 3. By setting the variable diameter mechanism, the spring sheet and the elastic cloth work together to effectively solve the possible blockage problem at the interface of the annular grouting pipe; when blockage occurs, the spring sheet can deform to increase the minimum aperture for the slurry to pass through, thereby improving the flow efficiency;

[0026] 4. By setting the assembling device, the assembly between the annular grouting pipe and the four-way connecting piece can be quickly and accurately completed, ensuring that the formed structure is a standard circle, thereby optimizing the uniform distribution of the slurry during the grouting process and improving the construction quality. BRIEF DESCRIPTION OF DRAWINGS

[0027] The present application will be further described below with reference to the accompanying drawings.

[0028] Figure 1 is the overall three-dimensional structure schematic diagram of the composite grouter based on the post-grouting process;

[0029] Figure 2 is the partial structure local cut three-dimensional structure schematic diagram of the composite grouter based on the post-grouting process;

[0030] Figure 3 is Figure 2 the enlarged structure schematic diagram of area A in FIG. 6;

[0031] Figure 4 is the three-dimensional enlarged structure schematic diagram of the variable diameter mechanism of the present application;

[0032] Figure 5 is a schematic diagram of the three-dimensional amplification structure of the connecting hose of the present application;

[0033] Figure 6 is a schematic diagram of the three-dimensional amplification structure of the partial section of the four-way connecting piece of the present application;

[0034] Figure 7 is a schematic diagram of the three-dimensional structure of the assembling device of the composite grouting device based on the post-grouting process;

[0035] Figure 8 is a schematic diagram of the three-dimensional structure of the assembling device of the composite grouting device based on the post-grouting process after removing one of the four-way connecting pieces;

[0036] Figure 9 is a schematic diagram of the three-dimensional amplification structure of the driving mechanism of the present application.

[0037] In the figure: 1, vertical grouting pipe; 11, connecting section; 12, grouting section; 13, grouting hole; 2, annular grouting pipe; 21, connecting hose; 22, connecting head; 23, second clamping block; 24, second clamping groove; 3, four-way connecting piece; 4, reducing mechanism; 41, mounting ring; 42, connecting ring; 43, spring sheet; 44, elastic cloth; 45, first clamping block; 46, first clamping groove; 47, connecting rod; 5, assembling seat; 6, limiting groove; 7, assembling mechanism; 71, first rotating rod; 72, clamping block; 73, clamping groove; 74, driving mechanism; 741, air cylinder; 742, mounting block; 743, second rotating rod. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0039] As shown in Figures 1-6 , the composite grouting device based on the post-grouting process, as shown in Figures 1-4As shown, it comprises a pair of vertical grouting pipes 1 and an annular grouting pipe 2 arranged between the pair of vertical grouting pipes 1; the pair of vertical grouting pipes 1 and the annular grouting pipe 2 are connected through a four-way connector 3; a variable diameter mechanism 4 is arranged between the four-way connector 3 and the annular grouting pipe 2; the variable diameter mechanism 4 comprises a mounting ring 41 inserted into the connecting port of the four-way connector 3, a connecting ring 42 inserted into the connecting port of the annular grouting pipe 2, a plurality of spring sheets 43 arranged between the mounting ring 41 and the connecting ring 42, and a connecting rod 47 with one end fixed to the mounting ring 41 and the other end fixed to the connecting port of the annular grouting pipe 2; the variable diameter mechanism 4 further comprises an elastic cloth 44 arranged between adjacent spring sheets 43; the spring sheet 43 is in an arc-shaped structure, and the mounting ring 41, the spring sheet 43, the elastic cloth 44 and the connecting ring 42 form a Venturi tube structure; when the internal pressure of the Venturi tube structure increases, the spring sheet 43 can be deformed to change the minimum inner diameter of the Venturi tube structure.

[0040] Through the combined use of the vertical grouting pipe 1 and the annular grouting pipe 2, the uniformity of the distribution of the slurry in the pile during the grouting process can be significantly improved, thereby improving the overall quality of the pile.

[0041] Since the annular grouting pipe 2 is designed as a flexible hose, it is easily affected by the impact of the slurry during grouting, especially at the interface position, which may cause the annular grouting pipe 2 to fall off from the four-way connector 3; therefore, by arranging the mounting ring 41, the connecting ring 42 and the spring sheet 43 to form a Venturi tube structure, which is specially designed to cover the interface area between the annular grouting pipe 2 and the four-way connector 3, effectively blocking the direct impact of the slurry on the interface part, thereby reducing the risk of interface loosening caused by impact; and the design of the Venturi tube structure makes the outlet diameter gradually increase when the slurry flows through the structure and enters the annular grouting pipe 2, thereby slowing down the flow speed of the slurry; such design not only further reduces the impact force of the slurry on the annular grouting pipe 2, but also more effectively protects the annular grouting pipe 2, ensuring the safety and stability of the entire grouting process;

[0042] In addition, through the synergistic effect of the spring sheet 43 and the elastic cloth 44, the possible blockage problem at the interface position of the annular grouting pipe 2 can be effectively addressed. When encountering a blockage situation, the spring sheet 43 can be deformed under force, thereby increasing the minimum aperture for the slurry to pass through and improving the flow efficiency of the slurry; this design also allows the variable diameter mechanism 4 to adjust the aperture size of the slurry passing through accordingly when the output speed of the grouting machine changes, to adapt to different flow rate requirements, ensuring that the slurry always passes through at an appropriate speed, maintaining the smooth progress of the grouting process; this not only improves the adaptability of the system to different working conditions, but also further guarantees the construction quality and efficiency.

[0043] As Figures 3-4 and Figure 6 shown, the variable-diameter mechanism 4 further comprises a plurality of first clamping blocks 45; the plurality of first clamping blocks 45 are arranged on the mounting ring 41, and the four-way connector 3 is internally provided with a plurality of first clamping grooves 46 which are adapted to the first clamping blocks 45; when the connecting port of the connecting hose 21 is inserted into the four-way connector 3, the first clamping blocks 45 are clamped in the first clamping grooves 46; it should be noted that through the cooperation of the first clamping blocks 45 and the first clamping grooves 46, the variable-diameter mechanism 4 and the four-way connector 3 can be quickly clamped and aligned, which not only ensures the stability of the connection, but also facilitates the convenience of assembly.

[0044] As Figures 1-2 and Figure 6 shown, the vertical grouting pipe 1 comprises a connecting section 11 and a grouting section 12 with grouting holes 13; the connecting section 11 is connected to the top of the four-way connector 3, and the grouting section 12 is connected to the bottom of the four-way connector 3; in order to achieve more flexible grouting control, the annular grouting pipe 2 is provided with a grouting valve. Similarly, a similar valve function is also configured at the grouting holes 13 of the grouting section 12. Specifically, this valve structure can be constructed by a simple method: a drawing pin is inserted into the grouting hole 13 and wrapped with adhesive tape; the simple grouting valve thus formed can directly flush away the drawing pin and adhesive tape by high-pressure grout when the grouting machine starts working, thereby not affecting the normal grouting process; it is worth noting that even if the drawing pin and adhesive tape are flushed into the pile column, they will not adversely affect the forming quality of the final pile column, because these small objects will be safely sealed in the concrete; this method is simple and practical, providing great convenience for on-site construction.

[0045] As Figures 1-2 shown, the annular grouting pipe 2 comprises two semi-circular connecting hoses 21 with connecting heads 22; the two connecting hoses 21 are connected to the four-way connector 3 through the connecting heads 22, and the two connecting hoses 21 and the four-way connector 3 form a circular structure; the connecting heads 22 are provided with second clamping blocks 23, and the four-way connector 3 is internally provided with second clamping grooves 24 which are adapted to the second clamping blocks 23; when the connecting heads 22 are connected to the four-way connector 3, the second clamping blocks 23 are clamped in the second clamping grooves 24. It should be noted that through the cooperation of the second clamping blocks 23 and the second clamping grooves 24, a stable connection between the four-way connector 3 and the connecting hoses 21 can be ensured, thereby further enhancing the stability of the connection between the annular grouting pipe 2 and the four-way connector 3; in addition, the connecting hoses 21 and the four-way connector 3 together constitute a standard circular structure, which helps to uniformly distribute the grout during the grouting process, thereby improving the uniformity of grout distribution during the entire grouting process. This design not only strengthens the connection strength between components, but also optimizes the grout flow pattern, which is of great significance for improving the quality of the pile column.

[0046] As Figures 1-9 The assembling device of the composite grouting machine based on the post-grouting process comprises an assembling seat 5 and an assembling mechanism 7 arranged on the assembling seat 5; the assembling mechanism 7 drives the annular grouting pipe 2 to assemble and splice with the four-way connecting piece 3; a pair of limiting grooves 6 adapted to the four-way connecting piece 3 are arranged on the assembling seat 5.

[0047] The existing grouting pipe is usually installed by manual operation, but the connection hose 21 and the four-way connecting piece 3 need to be precisely assembled to form a standard circular structure in the present application, and it is difficult to achieve this precision requirement by manual assembly; therefore, the special assembling device is arranged to realize the automatic assembly between the connection hose 21 and the four-way connecting piece 3, which not only improves the convenience of assembly, but also greatly improves the work efficiency.

[0048] The specific assembling process is as follows: first, the two four-way connecting pieces 3 are inserted into the limiting grooves 6 to ensure their accurate positions; then, the interface of the connection hose 21 is moved by the assembling mechanism 7 until it is accurately inserted into the four-way connecting piece 3; in this way, the assembly between the annular grouting pipe 2 and the four-way connecting piece 3 can be quickly and accurately completed, and the structure formed is a standard circle, so that the uniform distribution of the grout in the grouting process is optimized, and the construction quality is improved.

[0049] As Figures 7-8 shown, the assembling mechanism 7 comprises a driving mechanism 74 and a pair of first rotating rods 71; the pair of first rotating rods 71 are rotatably connected to the assembling seat 5 at the midpoint position by a pin shaft; it can be understood that the pin shaft is a prior art and will not be described in detail; the two ends of each first rotating rod 71 are provided with clamping blocks 72, and the connection head 22 is provided with clamping grooves 73 adapted to the clamping blocks 72; the driving mechanism 74 is installed on the assembling seat 5, and when the connection head 22 is clamped to the clamping block 72 through the clamping groove 73, the driving mechanism 74 is used to drive the first rotating rod 71 to rotate to drive the connection head 22 to be inserted into the four-way connecting piece 3.

[0050] It should be noted that first, the connection heads 22 at both ends of the connection hose 21 are clamped to the clamping blocks 72 through the clamping grooves 73, at this time, there is a distance between the connection head 22 and the four-way connecting piece 3, and the four-way connecting piece 3 and the connection head 22 are on the same circle; then the connection head 22 is moved along the circle by the driving mechanism 74 until the connection head 22 is inserted into the four-way connecting piece 3, in this process, the first clamping block 45 is first inserted into the first clamping groove 46, and then the second clamping block 23 is inserted into the second clamping groove 24, so that the stable connection between the connection head 22 and the four-way connecting piece 3 is realized.

[0051] As Figures 7-9As shown, it can be understood that the specific structure and mounting mode of the driving mechanism 74 are not limited in the present application, and only one possible technical solution is provided below; the driving mechanism 74 includes a cylinder 741, a mounting block 742, and a pair of second rotating rods 743; the cylinder 741 is mounted on the assembly seat 5, the mounting block 742 is mounted on the output end of the cylinder 741, one end of the pair of second rotating rods 743 is respectively hinged to the two sides of the mounting block 742, and the other end of the pair of second rotating rods 743 is respectively hinged with the pair of first rotating rods 71; when the cylinder 741 drives the mounting block 742 to move, the pair of first rotating rods 71 is driven to rotate along the pin shaft position through the second rotating rod 743.

[0052] It should be noted that the mounting block 742 is pushed to move by the cylinder 741, the second rotating rod 743 is driven to move by the mounting block 742, and the pair of first rotating rods 71 is simultaneously pushed to rotate along the pin shaft by the second rotating rod 743, thereby driving the connecting head 22 on the clamping block 72 to move close to the four-way connecting piece 3 until the connecting head 22 is inserted into the four-way connecting piece 3, so as to complete the purpose of quickly assembling the annular grouting pipe 2 and the four-way connecting piece 3.

[0053] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation and a particular orientation configuration and operation, therefore, it cannot be understood as a limitation on the present application. In addition, "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified and limited, the term "mounting", "connecting", "connecting" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] The above has described one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application shall still belong to the patent scope of the present application.

Claims

1. A composite grouting device based on a post-grouting process, comprising a pair of vertical grouting pipes (1) and an annular grouting pipe (2); characterized in that: A pair of vertical grouting pipes (1) and an annular grouting pipe (2) are connected via two four-way connectors (3); a diameter-changing mechanism (4) is provided between the four-way connector (3) and the annular grouting pipe (2); the diameter-changing mechanism (4) comprises: A mounting ring (41), wherein the mounting ring (41) is inserted into a connection port of the four-way connector (3); A connecting ring (42), the connecting ring (42) being inserted into the connecting port of the annular grouting pipe (2); A plurality of spring sheets (43), wherein the plurality of spring sheets (43) are arranged between the mounting ring (41) and the connecting ring (42); and a connecting rod (47), one end of the connecting rod (47) being fixed to the mounting ring (41), and the other end of the connecting rod (47) being fixed to the connection port of the annular grouting pipe (2); The diameter-changing mechanism (4) further includes an elastic cloth (44); the elastic cloth (44) is arranged between adjacent spring sheets (43); The spring sheet (43) is an arc-shaped structure, and the mounting ring (41), the spring sheet (43), the elastic cloth (44) and the connecting ring (42) form a Venturi tube structure; when the internal pressure of the Venturi tube structure increases, the spring sheet (43) can be pushed to deform, thereby changing the minimum inner diameter of the Venturi tube structure.

2. The composite grouting device based on the post-grouting process according to claim 1, characterized in that: The diameter-changing mechanism (4) further comprises a plurality of first clamping blocks (45); the plurality of first clamping blocks (45) are arranged on the mounting ring (41), and a first clamping groove (46) adapted to the first clamping blocks (45) is provided in the four-way connector (3).

3. The composite grouting device based on the post-grouting process according to claim 1, characterized in that: The vertical grouting pipe (1) comprises a connecting section (11) and a grouting section (12) with grouting holes (13); the connecting section (11) is connected to the top of the four-way connector (3), and the grouting section (12) is connected to the bottom of the four-way connector (3).

4. The composite grouting device based on the post-grouting process according to claim 2, characterized in that: The annular grouting pipe (2) comprises two semicircular connecting hoses (21) with connectors (22); the two connecting hoses (21) are connected to a four-way connector (3) via the connectors (22), and the two connecting hoses (21) and the four-way connector (3) form a circular structure; When the connection port of the connecting hose (21) is plugged into the four-way connector (3), the first clamping block (45) is clamped into the first clamping groove (46).

5. The composite grouting device based on the post-grouting process according to claim 4 is characterized in that: A second clamping block (23) is provided on the connector (22), and a second clamping slot (24) adapted to the second clamping block (23) is provided in the four-way connector (3); when the connector (22) is connected to the four-way connector (3), the second clamping block (23) is clamped in the second clamping slot (24).

6. The assembly device of the composite grouting device based on the post-grouting process according to claim 4, characterized in that: The utility model comprises an assembly seat (5) and an assembly mechanism (7) arranged on the assembly seat (5); the assembly mechanism (7) drives the annular grouting pipe (2) and the four-way connecting piece (3) to be assembled and spliced; the assembly seat (5) is provided with a pair of limiting grooves (6) adapted to the four-way connecting piece (3).

7. The assembly device of the composite grouting device based on the post-grouting process according to claim 6, characterized in that: The assembly mechanism (7) includes a driving mechanism (74) and a pair of first rotating rods (71); the pair of first rotating rods (71) are rotatably connected to the assembly seat (5) at a midpoint position through a pin shaft; a clamping block (72) is provided at both ends of each first rotating rod (71), and a clamping groove (73) adapted to the clamping block (72) is provided on the connector (22); the driving mechanism (74) is installed on the assembly seat (5), and when the connector (22) is clamped to the clamping block (72) through the clamping groove (73), the driving mechanism (74) is used to drive the first rotating rods (71) to rotate, so as to drive the connector (22) to be plugged into the four-way connector (3).

8. The assembly device of the composite grouting device based on the post-grouting process according to claim 7, characterized in that: The driving mechanism (74) comprises a cylinder (741), a mounting block (742) and a pair of second rotating rods (743); the cylinder (741) is mounted on the assembly seat (5), the mounting block (742) is mounted on the output end of the cylinder (741), one end of the pair of second rotating rods (743) is hinged to both sides of the mounting block (742), and the other end of the pair of second rotating rods (743) is hinged to the pair of first rotating rods (71); when the cylinder (741) drives the mounting block (742) to move, the second rotating rods (743) drive the pair of first rotating rods (71) to rotate along the pin position.

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