Low wind resistance flow guide device of new energy refrigerated vehicle

Abstract

The present application relates to the field of new energy refrigerated truck flow guide, specifically relates to a low wind resistance flow guide device of new energy refrigerated truck, including the frame, the frame one side top is equipped with the car head.The present application can automatically trigger the synchronous unfolding of the flow guide cover and the two side flow guide plates by means of the hitching action of the refrigerated truck compartment and the traction saddle, and the automatic reset storage is realized by the spring elastic force after the compartment is separated.The traditional manual adjustment, one-by-one operation and visual positioning mode is abandoned, the operation process is simplified, the adjustment efficiency and positioning accuracy are improved, the stable work of the flow guide structure is ensured, the whole vehicle aerodynamic performance is optimized, and the driving wind resistance is reduced.At the same time, by the thread cooperation of the internal thread cylinder and the color mark adjusting rod, the adjusting stroke can be accurately preset according to the refrigerated truck compartment of different height, after one-time adaptive adjustment, the flow guide cover and the compartment top surface can be automatically leveled, the flow guide plate angle is uniform, the general adaptive demand of multiple compartments is met, the energy consumption is effectively reduced, and the new energy refrigerated truck cruising range is prolonged.

Description

Technical Field

[0001] This invention relates to the field of airflow guidance for new energy refrigerated trucks, and specifically to a low-wind-resistance airflow guidance device for new energy refrigerated trucks. Background Technology

[0002] The low-drag airflow guide device is a special energy-saving component installed on the top of the cab, the front of the cargo box, or the periphery of the refrigeration unit of a new energy refrigerated truck. It uses streamlined curved surfaces and smooth connection structures to sort out the airflow, suppress eddies, and reduce the overall drag coefficient of the vehicle. Its core function is to reduce power consumption, increase range, and at the same time protect the refrigeration unit and optimize heat dissipation.

[0003] In patent application CN114007932B, published on 2025-05-06, entitled "A Device for Pivotibly Connecting an Air Flow Element to a Vehicle," this invention specifically relates to a device for pivotally connecting an air flow element to a vehicle, preferably to the rear wall of the cab of a multi-purpose vehicle, wherein the air flow element is preferably a side air flow element at the rear of the cab. The device includes a pivot hinge designed to be secured to the air flow element on one side and to the vehicle on the other. The pivot hinge has a locking mechanism designed to automatically lock the pivot hinge upon reaching at least one predetermined pivot position.

[0004] In the field of new energy refrigerated trucks, including the aforementioned patents or prior art, to reduce air resistance, improve energy efficiency, extend driving range, and reduce operating costs, air deflectors and side deflectors are typically installed above and on both sides of the vehicle's cab to guide airflow and reduce turbulence. To achieve optimal aerodynamic performance, the upper surface of the air deflector must be flush with the upper surface of the refrigerated compartment. However, existing air deflectors generally use manual adjustment, relying on the operator's visual observation. This makes it difficult to guarantee precise alignment between the air deflector and the compartment, and requires separate adjustment of different air deflector components, resulting in poor accuracy and inconvenient operation.

[0005] Therefore, it is necessary to invent a low-wind-resistance airflow guiding device for new energy refrigerated trucks to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a low-wind-resistance airflow guiding device for new energy refrigerated trucks. It achieves automatic deployment and automatic resetting of the trailer through pure mechanical linkage, and can be pre-adjusted to adapt to trailers of different heights, so as to solve the problems of cumbersome manual adjustment, low precision and inability to guarantee the best airflow guiding effect in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a low-drag airflow guiding device for a new energy refrigerated truck, comprising a frame, a truck head mounted on one side of the frame, a radiator mounted rotatably on the top of the truck head, and radiators mounted symmetrically on both sides of the truck head. A traction saddle is mounted on the side of the frame away from the truck head, and a refrigerated compartment is provided on the side of the truck head near the traction saddle. A traction pin is installed below the refrigerated compartment, and the traction pin of the refrigerated compartment is engaged with the traction saddle. A limiting seat is mounted on the top of the frame near the traction saddle, and a transmission rod is connected through the limiting seat. One end of the transmission rod is located between the traction saddle and the frame, and a drive assembly is provided between the other end of the transmission rod and the radiator and the two sets of radiators. A limiting strip is mounted on the top of the transmission rod, and the limiting strip is slidably connected through the inner wall of the limiting seat. A push plate is mounted on the side of the transmission rod near the traction saddle, and the push plate is located in the traction docking groove of the traction saddle.

[0008] As a preferred embodiment of the present invention, multiple sets of guide frames are sequentially installed on the upper part of the vehicle frame, and the guide frame near the traction saddle is connected to the transmission rod through the frame.

[0009] As a preferred embodiment of the present invention, an adjusting rod is connected through the guide frame near the front of the vehicle, and the surface of the adjusting rod is threaded, and the thread is marked with different colored markings according to the distance.

[0010] As a preferred embodiment of the present invention, the end of the transmission rod away from the traction saddle is rotatably connected to an internally threaded cylinder, and the internally threaded cylinder is threaded to the surface of the adjusting rod, and the adjusting rod and one end of the transmission rod are slidably connected through each other.

[0011] As a preferred embodiment of the present invention, the drive assembly includes push rods, which are symmetrically slidably connected to the side of the front of the vehicle near the refrigerated compartment, and a connecting arm is installed at one end of each of the two sets of push rods.

[0012] As a preferred embodiment of the present invention, each of the three surfaces of the two sets of connecting arms is provided with a through groove, and a connecting seat is symmetrically installed on the side of the guide shield away from the rotating connection with the front of the vehicle, and the connecting seat is slidably connected to the corresponding through groove.

[0013] As a preferred embodiment of the present invention, a connecting rod is installed between the lower ends of the two sets of push rods, a guide seat is sleeved on the upper part of the connecting rod and the guide seat is fixedly connected to the surface of the vehicle head, and a spring is sleeved on the connecting rod, with the two ends of the spring respectively abutting the lower part of the guide seat and the lower part of the connecting rod.

[0014] As a preferred embodiment of the present invention, a connecting arm is rotatably connected between the connecting rod and the adjusting rod, a through groove is provided on the surface of the connecting arm, and a connecting seat is installed on one side of the vehicle head, and the connecting seat is slidably connected to the inside of the through groove.

[0015] As a preferred embodiment of the present invention, the two sets of push rods are sequentially rotatably connected to the adjacent guide plates by connecting arms two, and the rotational connection direction between one end of each connecting arm two and the push rod is the same as the sliding direction of the push rod, and the rotational connection direction between the other end of each connecting arm two and the guide plate is the same as the rotational connection direction between the guide plate and the front of the vehicle.

[0016] As a preferred embodiment of the present invention, each set of connecting arms has a through groove three on its surface, and connecting seats three are symmetrically installed downwards on one side of the vehicle head, and each set of connecting seats three is slidably connected to the corresponding through groove three inside.

[0017] Compared with the prior art, the technical effects and advantages provided by the present invention in the above technical solution are as follows: The deployment of the fairing and side deflectors is automatically triggered by the engagement of the refrigerated compartment with the traction saddle. Upon unloading, the fairing automatically returns to its initial retracted state due to spring force. This completely solves the problems of cumbersome operation and low efficiency caused by the manual adjustment, component-by-component adjustment, and reliance on visual positioning required by traditional deflector devices. It also improves the precision of deflector adjustment, ensuring that the deflector always performs at its optimal aerodynamic performance, maximizing the reduction of the vehicle's drag coefficient, effectively increasing the driving range of new energy refrigerated trucks, and reducing operating energy consumption. By screwing together the internally threaded cylinder with the adjusting rod marked with color distance indicators, the trigger stroke and final adjustment position of the air guide device can be precisely set in advance according to different height specifications of refrigerated trucks. Only a one-time pre-adjustment is needed when initially matching a truck of a new height; subsequently, when attaching trucks of the same specifications, the air guide will automatically adjust to the optimal working height, completely flush with the top surface of the truck body, while ensuring that the deployment angle of the air guides on both sides is consistent. This achieves universal compatibility with various standard refrigerated trucks. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the vehicle frame structure of the present invention; Figure 3This is a schematic diagram of the refrigerated compartment structure of the present invention; Figure 4 This is a schematic diagram of the guide plate structure of the present invention; Figure 5 This is a schematic diagram of the flow guide structure of the present invention; Figure 6 This is a schematic diagram of the transmission rod structure of the present invention; Figure 7 This is a schematic diagram of the connection structure between the transmission rod and the adjusting rod of the present invention; Figure 8 For the present invention Figure 3 Enlarged structural diagram at point A in the middle.

[0020] Explanation of reference numerals in the attached figures: 101. Front of the vehicle; 102. Refrigerated compartment; 103. Draft fairing; 104. Draft vane; 105. Traction saddle; 106. Frame; 201. Drive rod; 202. Limiting seat; 203. Push plate; 204. Guide frame; 205. Adjusting rod; 206. Internal threaded cylinder; 207. Limiting strip; 003. Drive assembly; 301. Push rod; 302. Through slot one; 303. Connecting seat one; 304. Connecting rod; 305. Guide seat; 306. Spring; 307. Connecting arm one; 308. Through slot two; 309. Connecting seat two; 310. Connecting arm two; 311. Through slot three; 312. Connecting seat three; 313. Connecting arm three. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] This invention provides, for example Figure 1-8The diagram illustrates a low-drag aerodynamic device for a new energy refrigerated truck, comprising a frame 106. A cab 101 is mounted on one upper side of the frame 106. A deflector 103 is rotatably mounted above the cab 101. Deflectors 104 are symmetrically rotatably mounted on both sides of the cab 101. A traction saddle 105 is mounted on the side of the frame 106 away from the cab 101. A refrigerated compartment 102 is located on the side of the cab 101 closest to the traction saddle 105. A traction pin is mounted below the refrigerated compartment 102, and the traction pin of the refrigerated compartment 102 engages with the traction saddle 105. The frame 106 is located near the traction saddle. A limiting seat 202 is installed on the upper side of one side of 105. A transmission rod 201 is connected through the limiting seat 202. One end of the transmission rod 201 is located between the traction saddle 105 and the frame 106. A drive assembly 003 is provided between the other end of the transmission rod 201 and the fairing 103 and the two sets of guide plates 104. A limiting strip 207 is installed above the transmission rod 201. The limiting strip 207 is slidably connected through the inner wall of the limiting seat 202. A push plate 203 is installed on the side of the transmission rod 201 near the traction saddle 105. The push plate 203 is located in the traction docking groove of the traction saddle 105.

[0023] When the refrigerated compartment 102 is engaged with the traction saddle 105 via the traction pin, the push plate 203 will be automatically pushed to move axially, thereby driving the transmission rod 201 to move synchronously. The cooperation between the limit seat 202 and the limit strip 207 restricts the circumferential rotation of the transmission rod 201, ensuring that it can only slide smoothly along the axial direction, providing a basis for the precise transmission of the subsequent drive component 003. The process does not require manual start-up and adjustment, solving the problem of cumbersome manual operation in traditional devices.

[0024] Furthermore, in the above structure, multiple sets of guide frames 204 are sequentially installed above the frame 106, and the guide frame 204 near the traction saddle 105 is connected to the transmission rod 201 through it.

[0025] Multiple sets of guide frames 204 provide multi-point support and guidance for the long-distance transmission rods 201 and adjusting rods 205.

[0026] Furthermore, in the above structure, an adjusting rod 205 is connected through the guide frame 204 on the side near the front of the vehicle 101, and the surface of the adjusting rod 205 is threaded, and the thread is marked with different colored markings according to the distance.

[0027] The threaded structure on the surface of the adjusting rod 205 provides a precise adjustment reference for the stroke adjustment of the flow guiding device; the distance markings of different colors allow operators to intuitively and quickly identify the adjustment amount. The target height of the flow guiding cover 103 can be precisely set in advance according to the different height specifications of the refrigerated compartment 102, ensuring that the flow guiding cover 103 can be completely flush with the top surface of any matching compartment, so as to achieve the best flow guiding effect.

[0028] Furthermore, in the above structure, the end of the transmission rod 201 away from the traction saddle 105 is rotatably connected to an internally threaded cylinder 206, and the internally threaded cylinder 206 is threaded to the surface of the adjusting rod 205, and the adjusting rod 205 is slidably connected to one end of the transmission rod 201.

[0029] The relative total length between the transmission rod 201 and the adjusting rod 205 can be adjusted by rotating the internal threaded cylinder 206, thereby precisely adjusting the trigger stroke and final adjustment position of the flow guiding device; the through sliding connection between the adjusting rod 205 and the transmission rod 201 further ensures the coaxiality and stability of their relative movement.

[0030] Furthermore, in the above structure, the drive assembly 003 includes push rods 301, which are symmetrically slidably connected to the side of the front of the vehicle 101 near the refrigerated compartment 102. Each of the two sets of push rods 301 has a connecting arm 313 installed at one end above it.

[0031] The two sets of push rods 301 arranged symmetrically can transmit power to the two side guide plates 104 and the middle guide shroud 103 at the same time, ensuring the high synchronicity of the adjustment actions of all guide components; the connecting arm 313, as the intermediate component for power transmission, converts the vertical linear motion of the push rod 301 into the rotational motion of the guide shroud 103, realizing the conversion of motion form.

[0032] Furthermore, in the above structure, both sets of connecting arms 313 have through grooves 302 on their surfaces, and the fairing 103 is symmetrically equipped with connecting seats 303 on the side away from the rotating connection with the front of the vehicle 101, and the connecting seats 303 are slidably connected to the corresponding through grooves 302.

[0033] The sliding connection structure between the through groove 302 and the connecting seat 303 can compensate for the horizontal displacement difference generated during the rotation of the guide shroud 103 by the connecting arm 313, completely avoiding motion interference and ensuring smooth transmission. The symmetrical connection structure makes the guide shroud 103 evenly stressed on both sides during rotation adjustment, preventing the guide shroud 103 from twisting and deforming due to uneven stress.

[0034] Furthermore, in the above structure, a connecting rod 304 is installed between the lower ends of the two sets of push rods 301. A guide seat 305 is sleeved on the upper part of the connecting rod 304, and the guide seat 305 is fixedly connected to the surface of the front end 101. A spring 306 is sleeved on the connecting rod 304, and the two ends of the spring 306 are respectively attached to the lower part of the guide seat 305 and the lower part of the connecting rod 304.

[0035] The two independent push rods 301 are rigidly connected into a whole by the connecting rod 304, which fundamentally ensures the absolute synchronicity of the movement of the push rods 301 on both sides, thereby ensuring that the adjustment angle of the guide plates 104 on both sides is completely consistent; the guide seat 305 provides precise vertical guidance for the connecting rod 304; the spring 306 provides an automatic reset function for the entire drive system. When the refrigerated compartment 102 is separated from the traction saddle 105, the elastic force of the spring 306 will drive all the guide components to automatically return to the initial storage position without manual reset operation.

[0036] Furthermore, in the above structure, a connecting arm 307 is rotatably connected between the connecting rod 304 and the adjusting rod 205. A through groove 308 is provided on the surface of the connecting arm 307. A connecting seat 309 is installed on one side of the front of the vehicle 101, and the connecting seat 309 is slidably connected to the through groove 308.

[0037] The lever transmission mechanism is formed by connecting arm 307, which efficiently converts the horizontal linear motion of adjusting rod 205 into the vertical linear motion of connecting rod 304, realizing a 90-degree change in the direction of power. The sliding connection between through slot 308 and connecting seat 309 provides a stable rotation fulcrum for the lever mechanism, while compensating for the displacement difference during lever rotation, ensuring the smoothness and reliability of transmission.

[0038] Furthermore, in the above structure, two sets of push rods 301 are sequentially connected to adjacent guide plates 104 by connecting arms 310 that rotate downwards. The rotational connection direction between one end of each connecting arm 310 and the push rod 301 is the same as the sliding direction of the push rod 301, and the rotational connection direction between the other end of each connecting arm 310 and the guide plate 104 is the same as the rotational connection direction between the guide plate 104 and the vehicle head 101.

[0039] The vertical linear motion of the push rod 301 is converted into the rotational motion of the guide plate 104, which expands outward or retracts inward, through the connecting arm 2 310. The specific rotational connection direction design ensures that there are no dead points or interferences in the motion transmission process, resulting in high transmission efficiency. The multiple sets of connecting arms 2 310 arranged downward in sequence ensure that the guide plate 104 is subjected to uniform force in the entire height direction, avoiding deformation of the guide plate 104 caused by single-point force, and improving the adjustment accuracy and structural strength.

[0040] Furthermore, in the above structure, each set of connecting arms 310 has a through groove 311 on its surface, and connecting seats 312 are symmetrically installed downwards on one side of the front of the vehicle 101, and each set of connecting seats 312 is slidably connected to the corresponding through groove 311 inside.

[0041] The sliding connection structure between the through slot 311 and the connecting seat 312 provides auxiliary support and precise guidance for the rotation of the connecting arm 2 310, restricts the movement trajectory of the connecting arm 2 310, and ensures that it can accurately drive the guide plate 104 to rotate according to the design requirements; the symmetrical arrangement of multiple sets of connecting seats 312 further improves the synchronicity and stability of the adjustment of the guide plates 104 on both sides, and ensures the symmetry of the wind resistance on the left and right sides of the vehicle.

[0042] like Figure 1-8 As shown, by rotating the internally threaded cylinder 206, which is rotatably connected to the transmission rod 201, and through its threaded engagement with the adjusting rod 205, the relative total length between the transmission rod 201 and the adjusting rod 205 is adjusted. The different colors of the distance markings on the surface of the adjusting rod 205 allow the operator to visually identify the adjustment amount and accurately set the target lifting height of the deflector 103, ensuring that the upper surface of the deflector 103 is completely flush with the top surface of the refrigerated truck compartment 102 after the compartment is attached. After pre-adjustment, the device enters a ready-to-trigger state, allowing for pre-setting according to different sizes of refrigerated truck compartments 102.

[0043] Then, when the refrigerated compartment 102 is engaged with the traction saddle 105 via the traction pin, the traction pin at the bottom of the compartment will push the push plate 203 to move axially toward the front of the truck 101. The push plate 203 drives the transmission rod 201 to slide synchronously, thereby pushing the adjusting rod 205 to move forward synchronously. The front end of the adjusting rod 205, through the connecting arm 307, converts the horizontal linear motion of the adjusting rod 205 into the vertical upward motion of the connecting rod 304. When the connecting rod 304 moves upward, it can drive the two sets of symmetrical push rods 301 to slide synchronously upward in the vertical direction. At the same time, the spring 306 sleeved on the connecting rod 304 is compressed. The connecting arm 313 at the upper end of the push rod 301 drives the deflector 103 to rotate upward around its axis of rotation with the front of the truck 101 until the upper surface of the deflector 103 is precisely flush with the top surface of the refrigerated compartment 102.

[0044] At the same time, the push rod 301 drives the two guide plates 104 on both sides to unfold outward synchronously through multiple sets of connecting arms 310 arranged downward in sequence, ensuring that the unfolding angle of the two guide plates 104 on both sides is completely consistent, so as to achieve the best lateral flow guidance effect.

[0045] When the transportation task is completed and the refrigerated compartment 102 separates from the traction saddle 105, the push plate 203 loses pressure at the bottom of the compartment. At this time, the compressed spring 306 releases its elastic force, causing the connecting rod 304 to move vertically downward along the guide seat 305. The connecting rod 304 drives the two sets of push rods 301 to slide downward synchronously, thereby causing the whole assembly to reset.

[0046] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A low-drag airflow guiding device for a new energy refrigerated truck, comprising a frame (106), a truck head (101) mounted on one side of the frame (106), a radiator (103) rotatably mounted on the top of the truck head (101), and radiators (104) symmetrically rotatably mounted on both sides of the truck head (101). A traction saddle (105) is mounted on the side of the frame (106) away from the truck head (101), and a refrigerated compartment (102) is provided on the side of the truck head (101) near the traction saddle (105). A traction pin is mounted below the refrigerated compartment (102), and the traction pin of the refrigerated compartment (102) is engaged with the traction saddle (105). The device is characterized in that: A limiting seat (202) is installed above the side of the frame (106) near the traction saddle (105). A transmission rod (201) is connected through the limiting seat (202). One end of the transmission rod (201) is located between the traction saddle (105) and the frame (106). A drive assembly (003) is provided between the other end of the transmission rod (201) and the fairing (103) and the two sets of guide plates (104). A limiting strip (207) is installed above the transmission rod (201). The limiting strip (207) is slidably connected through the inner wall of the limiting seat (202). A push plate (203) is installed on the side of the transmission rod (201) near the traction saddle (105). The push plate (203) is located in the traction docking groove of the traction saddle (105).

2. The low wind resistance airflow guiding device for a new energy refrigerated truck according to claim 1, characterized in that: Multiple guide frames (204) are sequentially installed on the top of the frame (106), and the guide frame (204) near the traction saddle (105) is connected to the transmission rod (201) through the shaft.

3. The low wind resistance airflow guiding device for a new energy refrigerated truck according to claim 1, characterized in that: An adjusting rod (205) is connected through the guide frame (204) on the side near the front of the vehicle (101), and the surface of the adjusting rod (205) is threaded, and the thread is marked with different colored marks according to the distance.

4. The low wind resistance airflow guiding device for a new energy refrigerated truck according to claim 2, characterized in that: The transmission rod (201) is rotatably connected to an internal threaded cylinder (206) at one end away from the traction saddle (105), and the internal threaded cylinder (206) is threaded to the surface of the adjusting rod (205), and the adjusting rod (205) is slidably connected to one end of the transmission rod (201).

5. The low wind resistance airflow guiding device for a new energy refrigerated truck according to claim 1, characterized in that: The drive assembly (003) includes push rods (301), which are symmetrically slidably connected to the front of the vehicle (101) on the side near the refrigerated compartment (102). Each of the two sets of push rods (301) has a connecting arm (313) installed at one end above it.

6. The low wind resistance airflow guiding device for a new energy refrigerated truck according to claim 5, characterized in that: Both sets of connecting arms three (313) have through grooves one (302) on their surfaces. The guide shield (103) is symmetrically equipped with a connecting seat one (303) on the side away from the rotating connection with the front of the vehicle (101), and the connecting seat one (303) is slidably connected to the corresponding through groove one (302).

7. A low-wind-resistance airflow guiding device for a new energy refrigerated truck according to claim 5, characterized in that: A connecting rod (304) is installed between the lower ends of the two sets of push rods (301). A guide seat (305) is sleeved on the upper part of the connecting rod (304), and the guide seat (305) is fixedly connected to the surface of the car head (101). A spring (306) is sleeved on the connecting rod (304), and the two ends of the spring (306) are respectively attached to the lower part of the guide seat (305) and the lower part of the connecting rod (304).

8. A low-wind-resistance airflow guiding device for a new energy refrigerated truck according to claim 7, characterized in that: A connecting arm (307) is rotatably connected between the connecting rod (304) and the adjusting rod (205). A through groove (308) is provided on the surface of the connecting arm (307). A connecting seat (309) is installed on one side of the vehicle head (101), and the connecting seat (309) is slidably connected to the inside of the through groove (308).

9. A low-wind-resistance airflow guiding device for a new energy refrigerated truck according to claim 5, characterized in that: The two sets of push rods (301) are connected to the adjacent guide plate (104) by connecting arms (310) rotating downwards in sequence. The rotational connection direction between one end of each set of connecting arms (310) and the push rod (301) is the same as the sliding direction of the push rod (301). The rotational connection direction between the other end of each set of connecting arms (310) and the guide plate (104) is the same as the rotational connection direction between the guide plate (104) and the front of the vehicle (101).

10. A low-wind-resistance airflow guiding device for a new energy refrigerated truck according to claim 9, characterized in that: Each set of connecting arm two (310) has a through groove three (311) on its surface, and connecting seat three (312) is symmetrically installed downward on one side of the vehicle head (101), and each set of connecting seat three (312) is slidably connected to the corresponding through groove three (311).

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