A clam air suction picking device with a turner

Abstract

The utility model relates to agricultural machinery equipment technical field discloses a kind of soil turning machines for shell air suction pick-up equipment, including being towed by tractor soil turning machine, further including pick-up component with soil turning machine detachable connection, soil turning machine includes the beam support of screwing in the top end of cover plate component and the roller shaft being located between cover plate component, multiple plough blades are equipped along the outer lateral surface circumferential of roller shaft, cover plate component top end is screwed with the speed reducer that penetrates up and down, pick-up component includes collection module and sorting module;Collection module includes scroll air pump, the gas outlet of scroll air pump is communicated with roller shaft, the utility model reduces adhesion by high-pressure airflow forming gas film on plough piece surface, combined with the obstacle avoidance function of flexible connection structure, realize the mud flat soil turning operation of efficient low resistance, reach the effect of preventing soil adhesion, reduce working resistance, improve equipment reliability.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery and equipment technology, specifically to a soil turning machine for shellfish air suction picking equipment. Background Technology

[0002] Beach shellfish (such as clams and razor clams) are important aquatic economic resources. Traditional harvesting methods mainly rely on manual labor, with workers using simple tools to search the mudflats. This is extremely labor-intensive, inefficient, and severely limited by tides. To improve efficiency, mechanized harvesting methods have emerged.

[0003] The applicant's previous Chinese utility model patent application, CN221329915U, disclosed a combine harvester for harvesting four-cornered clams in tidal flats. This harvesting mechanism includes a harvesting device and a tracked driving mechanism. The harvesting device uses a spiral roller brush to excavate the tidal flat substrate and shellfish, which are then screened through a first and second screening frame to separate the shellfish from the tidal flat substrate during harvesting. However, the resistance between the harvesting device and the tidal flat substrate is significant during the harvesting process, and the harvesting efficiency still needs further improvement. Furthermore, high-pressure water jet or submersible harvesters are used in large-scale shellfish harvesting. These methods utilize high-speed water flow or swirling currents to flush out clams buried on the beach for harvesting. However, they suffer from high energy consumption, strong dependence on water resources, and significant damage to the subsurface structure. In addition, a tillage-based harvesting method has emerged, typically using a rotary tiller pulled by a traction mechanism. The tiller blades turn over the surface mud and the shellfish embedded within it, bringing the buried shellfish to the surface. However, this technology also faces the following problems: the mud in the tidal flats has extremely strong adhesive properties, adhering tightly to the plow blades and rollers during operation, creating a "paste-like" phenomenon. This leads to a sharp increase in working resistance, increased traction load, and higher energy consumption. Utility Model Content

[0004] The purpose of this utility model is to provide a soil turning machine for shellfish air suction collection equipment, so as to solve the problems mentioned in the background art.

[0005] This application provides a soil turner for a shellfish pneumatic suction collection device, including a soil turner towed by a tractor, and a collection component detachably connected to the soil turner. The soil turner includes a support beam bracket screwed to the top of a cover plate assembly and a roller shaft disposed between the cover plate assemblies. Multiple plow blades are arranged circumferentially along the outer side of the roller shaft. A reduction gearbox that runs through the top and bottom of the cover plate assembly is screwed to the top of the cover plate assembly. The collection component includes a collection module and a sorting module. The collection module includes a vortex air pump, and the air outlet of the vortex air pump is connected to the roller shaft.

[0006] In one possible implementation, the roller includes a hollow roller tube, with a rotary joint at one end. The fixed end of the rotary joint is fixedly connected to an external air pipe, and the rotating end of the rotary joint is connected to the air inlet end of the roller. Multiple branch air pipes are provided inside the roller tube, and the branch air pipes pass through the roller wall and communicate with the plow blades on the outer side.

[0007] The rotary joint is sealed using a high-performance mechanical seal or graphite ring seal to ensure that no gas leaks when the roller rotates.

[0008] In one possible implementation, the plow blade includes a plow seat and a plow blade. The plow seat is hollow, with one end connected to a branch air pipe on the roller tube and the other end connected to the plow blade via a one-way valve.

[0009] In one possible implementation, the plow blade has an air cavity inside, and the front end face (the surface in contact with the soil) of the plow blade has multiple micron-sized pores that communicate with the air cavity.

[0010] In one possible implementation, the plow blade also includes an S-shaped flexible spring steel plate connecting the plow seat and the plow blade, and a solenoid valve disposed on the air pipe.

[0011] In one possible implementation, the gearbox includes an upper housing and a lower housing. The upper housing has a drive shaft tube near the tractor end, and a universal joint is connected to the drive shaft tube away from the gearbox end. A roller passes through the lower housing and engages with it. The upper housing is poweredly connected to the lower housing via a chain. The gearbox also includes a protective cover, and a plow for turning the soil is provided on the side of the protective cover near the tractor.

[0012] In one possible implementation, the beam support includes a main beam, one end of which is hinged to the top of the gearbox, and the other end of which is hinged to an upper pull rod connecting plate. A grooved left and right lower pull rod connecting arm with an opening facing downward is welded to the lower end of the upper pull rod connecting plate. The support also includes a set of suspension brackets symmetrically arranged along the main beam. The suspension brackets are screwed to the side ends of the left and right lower pull rod connecting arms, and one end of the suspension bracket is welded to the top of the cover plate assembly.

[0013] In one possible implementation, the cover assembly includes a top plate with a set of parallel left and right side plates extending downward at the left and right ends of the top plate, and also includes a rear baffle disposed on the top plate away from the tractor end.

[0014] In one possible implementation, the left and right side plates are provided with roller discs that are rotatably coupled to the roller shaft at their opposite ends.

[0015] In one possible implementation, a rear baffle connecting rod for strengthening the connection is hinged to the bottom outer side of the rear baffle, and the other end of the rear baffle connecting rod is hinged to the top plate via a hinge seat.

[0016] This invention has the following advantages over the prior art: By guiding the airflow of the picking component to form an air film on the surface of the plow blade, and combining it with the elastic deformation characteristics of the S-shaped flexible spring steel plate, the friction between the plow blade and the soil is significantly reduced during the turning process. At the same time, it has the ability to automatically avoid obstacles, thus effectively reducing the turning resistance and extending the service life of the equipment. This achieves the effects of reducing traction energy consumption, improving work efficiency, and adapting to complex tidal flat conditions. Attached Figure Description

[0017] Figure 1 This is an isometric drawing of the pickup device of this utility model; Figure 2 This is an isometric view of the soil turning machine of this utility model; Figure 3 This is a schematic diagram of the components of the soil turning machine of this utility model; Figure 4 This is a schematic diagram of the plow blade of this utility model; Figure 5 This utility model Figure 4 A sectional view; Figure 6 This utility model Figure 5 A magnified view of part A; Figure 7 This utility model Figure 4 A magnified view of part B; Figure 8 This is a schematic diagram of the roller shaft of this utility model.

[0018] In the diagram: 1. Tractor; 2. Tiller; 3. Pickup assembly; 31. Collection module; 311. Vortex air pump; 32. Sorting module; 4. Roller; 401. Roller tube; 402. Branch air pipe; 5. Cover plate assembly; 501. Top plate; 502. Left side plate; 503. Right side plate; 504. Rear baffle; 505. Rear baffle connecting rod; 6. Support beam bracket; 601. Main beam; 602. Left and right lower pull rod connecting arms; 603. Upper pull rod connecting plate; 604. Suspension bracket; 7. Gearbox; 701. Protective cover; 702. Drive shaft tube; 703. Universal joint; 8. Plow blade; 801. Plow seat; 802. Plow blade; 803. S-shaped flexible spring steel plate; 9. Rotary joint; 10. Roller disc. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] In the accompanying drawings of this application, to clearly and concisely express the core inventive points of this utility model, each component is shown as a structural schematic diagram or simplified drawing. This may result in some parts in the drawings appearing visually different from the specific structure described in the text. This does not constitute a limitation on the actual structure of this utility model. Specific explanations are as follows: Regarding the representation of morphological structures: Components represented by simple lines or block diagrams in the drawings may have deviated from their actual shape. For example, the S-shaped flexible spring steel plate shown in the drawings is not drawn to scale and with its actual shape. Those skilled in the art should combine their understanding of the textual description in the specification with their knowledge of the component's complete technical features, rather than relying solely on the intuitive shape in the drawings.

[0021] like Figure 1-8 The illustrated shellfish pneumatic suction collection device includes a soil turner 2 towed by a tractor 1, and a collection assembly 3 detachably connected to the soil turner 2. The soil turner 2 includes a support beam bracket 6 screwed to the top of a cover plate assembly 5 and a roller 4 disposed between the cover plate assemblies 5. Multiple plow blades 8 are arranged circumferentially along the outer side of the roller 4. A gearbox 7 running through the top and bottom is screwed to the top of the cover plate assembly 5. The collection assembly 3 includes a collection module 31 and a sorting module 32. The collection module 31 includes a vortex air pump 311, and the air outlet of the vortex air pump 311 is connected to the roller 4.

[0022] The roller 4 includes a hollow roller tube 401. A rotary joint 9 is provided at one end of the roller 4. The fixed end of the rotary joint 9 is fixedly connected to an external air pipe, and the rotating end of the rotary joint 9 is connected to the air inlet end of the roller 4. Multiple branch air pipes 402 are provided inside the roller tube 401. The branch air pipes 402 pass through the roller wall and communicate with the plow blades 8 on the outer side.

[0023] The rotary joint 9 is sealed using a high-performance mechanical seal or a graphite ring seal to ensure that gas does not leak when the roller rotates.

[0024] The plow blade 8 includes a plow seat 801 and a plow blade 802. The plow seat 801 is hollow, with one end connected to a branch air pipe 402 on the roller tube 401, and the other end connected to the plow blade 802 through a one-way valve.

[0025] The plow blade 802 has an air cavity inside, and the front end face (the surface in contact with the soil) of the plow blade 802 has multiple micron-sized pores that are connected to the air cavity.

[0026] The plow blade 8 also includes an S-shaped flexible spring steel plate 803 that connects the plow seat 801 and the plow blade 802, and a solenoid valve installed on the air pipe.

[0027] In this embodiment, the fixed end of the rotary joint 9 is connected to the air outlet of the vortex air pump 311 of the pickup assembly 3 through an air pipe. An electromagnetic valve is provided inside the air pipe. To ensure that the gas does not leak when the roller 4 rotates at high speed, the sealing structure of the rotary joint 9 adopts a high-performance mechanical seal or a graphite ring seal. Multiple branch air pipes 402 connected to the rotary joint 9 are arranged axially inside the roller tube 401. The number of branch air pipes 402 is the same as the number of plow blades 8.

[0028] The plow blade 8 includes a plow seat 801, a plow blade 802, and an S-shaped flexible spring steel plate 803. The plow blade 802 has a flat, hollow hexahedral cross-section. One end of the plow seat 801 is provided with a pipe opening adapted to the branch air pipe 402, and the other end is connected to a one-way valve by a thread. The one-way valve adopts a duckbill structure, and the valve disc is made of elastic rubber material. It only allows airflow from the plow seat 801 to the plow blade 802, while preventing soil or water vapor from flowing back into the plow seat 801 and the air roller shaft tube 401 from the plow blade 802.

[0029] The plow blade 802 is made of spring steel, and the radius of curvature of the arc is determined according to the depth of soil turning in the tidal flat, ensuring that the plow blade 802 can smoothly cut into the soil and turn it up as it follows the rotation of the roller 4. The front end face of the plow blade 802 (i.e. the surface in contact with the soil) is processed with multiple micron-sized pores by laser drilling. The diameter of the pores is 10-20μm, the pore density is 50-80 pores / cm², and all pores are connected to the air cavity.

[0030] When the high-pressure airflow enters the air chamber of the plow seat 801, it is evenly sprayed onto the contact surface between the plow blade 802 and the soil through these micron-sized pores, forming an air film with a thickness of about 5-10 μm. This air film can significantly reduce the adhesion between the soil and the surface of the plow blade 802, thereby effectively preventing the adhesion of mud. At the same time, it will generate a deflection impulse on the plow blade 802. This impulse will push the S-shaped flexible spring steel plate 803 to bend. When the pressure in the air chamber of the plow seat 801 decreases or the air pipe is closed by the solenoid valve, the impulse on the S-shaped flexible spring steel plate 803 disappears, and the S-shaped flexible spring steel plate 803 automatically returns to its original shape, causing the plow blade 802 to oscillate under the action of inertia, effectively cleaning the soil attached to the surface of the plow blade 802.

[0031] In addition, when the plow blade 802 comes into contact with hard objects such as rocks and shells in the mudflats, the S-shaped spring steel plate can bend outward through elastic deformation, causing the plow blade 802 to avoid obstacles and prevent the plow blade 802 from being damaged by rigid impact; when the obstacle disappears, the spring steel plate can automatically return to its original shape, causing the plow blade 802 to return to the normal tillage position.

[0032] The gearbox 7 includes an upper housing and a lower housing. The upper housing is provided with a drive shaft tube 702 near the tractor 1. A universal joint 703 is connected to the end of the drive shaft tube 702 away from the gearbox 7. The roller 4 passes through the lower housing and meshes with it. The upper housing is poweredly connected to the lower housing via a chain. It also includes a protective cover 701. An auxiliary plow is provided on the side of the protective cover 701 near the tractor 1 to facilitate plowing.

[0033] The gearbox 7, as a power transmission unit, is responsible for transmitting the power of the tractor 1 to the roller 4, and ensuring that the roller 4 obtains the appropriate speed and torque through reduction and torque increase. The gearbox 7 includes an upper housing and a lower housing. The upper housing has a drive shaft tube 702 integrally formed at the end near the tractor 1. The drive shaft tube 702 has a spline hole and is connected to one end of the universal joint 703 via a spline. The universal joint 703 adopts a cross shaft structure, and its other end is connected to the power output shaft of the tractor 1 via a spline. Each of the four journals of the cross shaft is equipped with a needle roller bearing, and the bearing is covered with a dust cover to prevent mud and water from entering and causing wear.

[0034] The roller 4 passes through the lower housing and is fixed to the driven gear in the lower housing by a key. The upper housing is equipped with a driving gear, which is connected to the transmission shaft tube 702 by a key. The driving gear and the driven gear are driven by a chain. At the same time, a tension wheel is provided below the chain. The tension wheel presses the chain by a spring adjustment mechanism to ensure that the chain is always in a taut state.

[0035] The gearbox 7 is equipped with a protective cover 701, which is fixed to the gearbox 7 housing by means of a combination of buckles and bolts. This facilitates disassembly for maintenance of internal components and effectively prevents mud and water from the tidal flats from entering the gearbox 7, thus protecting transmission components such as gears and chains.

[0036] An auxiliary plow is bolted to the side of the protective cover 701 closest to the tractor 1. The angle between the tip of the auxiliary plow and the ground is 35-45 degrees. It can measure the depth of the surface mud of the tidal flat before the roller 4 plows, and at the same time reduce the turning resistance of the roller 4 and the plow blade 8. The gearbox 7 has an oil filling hole and an oil drain hole on the side of the box. The oil filling hole is used to add gear oil, and the oil drain hole is used to change the gear oil periodically.

[0037] The beam support 6 includes a main beam 601, one end of which is hinged to the top of the gearbox 7, and the other end of which is hinged to an upper pull rod connecting plate 603. A grooved left and right pull rod connecting arm 602 with an opening facing downward is welded to the lower end of the upper pull rod connecting plate 603. It also includes a set of suspension brackets 604 symmetrically arranged along the main beam 601. The suspension brackets 604 are screwed to the side ends of the left and right pull rod connecting arms 602, and one end of the suspension brackets 604 is welded to the top of the cover plate assembly 5.

[0038] In this embodiment, one end of the main beam 601 is connected to the top of the gearbox 7 via a hinge structure. The main beam 601 can rotate around the hinge point at a small angle, thereby driving the tiller 2 to adaptively adjust its posture when the tractor 1 is traveling on the undulating mudflats, thus avoiding damage to components caused by rigid impact.

[0039] The cover plate assembly 5 includes a top plate 501, a set of parallel left side plate 502 and right side plate 503 extending downward at the left and right ends of the top plate 501, and a rear baffle 504 disposed at the end of the top plate 501 away from the tractor 1.

[0040] The left side plate 502 and the right side plate 503 are provided with roller discs 10 that rotate with the roller shaft 4 at their opposite ends.

[0041] The bottom outer side of the rear baffle 504 is hinged to a rear baffle connecting rod 505 to enhance the connection strength. The other end of the rear baffle connecting rod 505 is hinged to the top plate 501 through a hinge seat.

[0042] In this embodiment, the surface of the top plate 501 of the cover plate assembly 5 is sandblasted to remove rust and then coated with an epoxy resin anti-corrosion coating to resist the erosion of seawater and moisture in the tidal flat environment and extend the service life. The left and right ends of the top plate 501 are extended downward through a bending process to form a set of parallel left side plate 502 and right side plate 503. The roller disc 10 has a circular flange structure with a mounting hole in the center that is compatible with the roller 4. A deep groove ball bearing is press-fitted into the mounting hole. The inner ring of the bearing is interference-fitted with the roller 4, and the outer ring is interference-fitted with the mounting hole of the roller disc 10. The bearing is filled with waterproof grease, which can effectively prevent mud and water from the tidal flats from entering the bearing and causing it to seize. The top plate 501, away from the tractor 1, is connected to a rear baffle 504 with an inclination angle of 110-120 degrees. This baffle can prevent the mud splashed during tillage from spreading to the rear of the device and guide the soil and shellfish mixture to the collection area of ​​the picking component 3.

[0043] During operation, the upper pull rod connecting plate 603 and the left and right lower pull rod connecting arms 602 of the support beam bracket 6 are first connected and fixed to the upper pull rod and lower pull rod of the tractor 1 respectively, and the power output shaft of the tractor 1 is connected to the transmission shaft tube 702 of the reduction gearbox 7 through the universal joint 703.

[0044] Start the tractor 1 and drive the device to the work beach area. Power is transmitted to the drive gear of the reduction gearbox 7 through the universal joint 703 and the drive shaft tube 702, and then to the driven gear through the chain, which drives the roller 4 to rotate. The speed of the roller 4 is controlled at 30-40 r / min to ensure that the plow blade 8 can smoothly cut into the mud and turn over the shellfish.

[0045] Then, the vortex air pump 311 is started, the solenoid valve is opened, and the high-pressure airflow enters the roller tube 401 through the air pipe and rotary joint 9, and then enters the air chamber of the plow blade 802 through the branch air pipe 402, plow seat 801 and one-way valve. Finally, it is sprayed from the micron-level pores to form an air film to prevent the adhesion of mud.

[0046] Tractor 1 travels at a low and constant speed, and plow blade 8 continuously turns over the mudflats. The mixture of mud and shellfish that is turned over is guided by the rear baffle 504 of cover assembly 5 and gathers at the front end of pickup assembly 3. During the operation, the airflow supply is adjusted by controlling the solenoid valve to open and close at time intervals through the control module (e.g., Omron H5CX-A). If an obstacle is encountered, the S-shaped spring steel plate can bend outward through elastic deformation, causing the plow blade 802 to avoid the obstacle and prevent the plow blade 802 from being damaged by rigid impact; when the obstacle disappears, the spring steel plate can automatically return to its original shape, causing the plow blade 802 to return to the normal tilling position.

[0047] After the operation is completed, turn off the vortex air pump 311 and the tractor 1, remove the pickup assembly 3, clean the device—remove the residual dirt from the roller shaft 4 and the plow blade 8, check the tightness of each connecting bolt, replace the gear oil in the gearbox 7, and ensure the reliability of the device for the next operation.

[0048] In summary, this embodiment solves the problem of soil adhesion during the turning process by supplying airflow to the roller 4 of the picking component 3 and then forming an air film through the micron-level pores on the surface of the plow blade 802. This reduces working resistance and traction energy consumption, and meets the needs of large-scale tidal flat shellfish harvesting operations.

[0049] The terms or phrases used in this application have the following meanings: In this application, "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features; in this application, "one or more" refers to any one, any two, or any two or more of the listed items, where "more than" refers to any two or any two or more; in this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientation or positional relationships based on actual application. The terms "installation," "connection," "joining," and "fixing" are used only for the purpose of facilitating and simplifying the description of this application, and are not intended to indicate or imply that the components referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting this application. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an adhesive connection. The above descriptions are for illustrative purposes only and do not represent the only implementation method. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tiller for a shellfish pneumatic suction collection device, comprising a tiller towed by a tractor, and a collection assembly detachably connected to the tiller, characterized in that: The tiller includes a support beam bracket screwed to the top of the cover plate assembly and a roller shaft disposed between the cover plate assemblies. Multiple plow blades are arranged circumferentially along the outer side of the roller shaft. A gearbox that runs through the top and bottom is screwed to the top of the cover plate assembly. The picking component includes a collection module and a sorting module; the collection module includes a vortex air pump, the air outlet of which is connected to a roller.

2. The device according to claim 1, characterised in that it comprises: The roller includes a hollow roller tube, with a rotary joint at one end. The fixed end of the rotary joint is fixedly connected to an external air pipe, and the rotating end of the rotary joint is connected to the air inlet end of the roller. Multiple branch air pipes are provided inside the roller tube, and the branch air pipes pass through the roller wall and communicate with the plow blades on the outer side.

3. A turner for use in the air suction picking apparatus for shellfish according to claim 2, characterized in that: The plow blade includes a plow seat and a plow blade. The plow seat is hollow, with one end connected to a branch air pipe on the roller tube and the other end connected to the plow blade through a one-way valve.

4. A turner for use in an air-suction shell picking apparatus according to claim 3, characterised in that: The plow blade has an air cavity inside, and the front end face of the plow blade has multiple micron-sized pores that are connected to the air cavity.

5. A turner for use in an air suction device for picking up shellfish according to claim 4, characterised in that: The plow blade also includes an S-shaped flexible spring steel plate connecting the plow seat and the plow blade, and a solenoid valve installed on the air pipe.

6. A turner for use in an air-suction shell picking apparatus according to claim 5, characterised in that: The gearbox includes an upper housing and a lower housing. The upper housing has a drive shaft tube near the tractor end, and a universal joint is connected to the drive shaft tube away from the gearbox end. A roller passes through the lower housing and engages with it. The upper housing is poweredly connected to the lower housing via a chain. It also includes a protective cover, and a plow for turning the soil is provided on the side of the protective cover near the tractor.

7. A turner for use in an air suction device for picking up shellfish according to claim 6, characterised in that: The beam support includes a main beam, one end of which is hinged to the top of the gearbox, and the other end of which is hinged to an upper pull rod connecting plate. A grooved left and right lower pull rod connecting arm with an opening facing downward is welded to the lower end of the upper pull rod connecting plate. It also includes a set of suspension brackets symmetrically arranged along the main beam. The suspension brackets are screwed to the side ends of the left and right lower pull rod connecting arms, and one end of the suspension bracket is welded to the top of the cover plate assembly.

8. The soil turner for the shellfish air suction collection device according to claim 7, characterized in that: The cover plate assembly includes a top plate, a set of parallel left and right side plates extending downwards at the left and right ends of the top plate, and a rear baffle plate disposed on the top plate away from the tractor end.

9. A turner for use in the air suction picking apparatus for shellfish according to claim 8, characterized in that: The left and right side plates are provided with roller discs that are rotatably coupled with the roller shaft at their opposite ends.

10. A turner for use in the air suction picking apparatus for shellfish according to claim 9, characterized in that: The bottom outer side of the rear baffle is hinged to a rear baffle connecting rod to enhance the connection strength, and the other end of the rear baffle connecting rod is hinged to the top plate through a hinge seat.

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