A wing-to-ground effect power generation device that changes the angle of attack by cooperating with inclined surfaces

Abstract

The present invention provides a wing-to-ground effect power generation device that changes the angle of attack by matching with an inclined surface, comprising an airfoil structure, a sliding structure and an angle of attack changing structure; the airfoil structure comprises two airfoils, an end connecting rod and a rear end bearing rod; the sliding structure comprises a slider, a pawl and a bearing; a cylindrical rod with a cap is provided on the upper part of the front surface and the lower part of the rear surface of the slider, the pawl is rotatably mounted on the cylindrical rod with a cap, and the pawl is connected to the cylindrical rod with a cap through a spring; the front end of the pawl is embedded between the teeth of the ratchet; a recess is provided on the side of the rear end of the pawl close to the slider; the angle of attack changing structure comprises a frame, and the slider is slidably mounted on the frame through a roller; the frame also comprises two accessory outer rods, and the airfoil structure can drive the sliding structure to move up and down between the two accessory outer rods; the frame also comprises bosses respectively arranged on the lower part of the front surface and the upper part of the rear surface of the side where the other slide rail is located. The technical solution of the present invention can change the angle of attack more quickly.

Description

Technical Field

[0001] The present invention relates to the field of power generation devices, and in particular to a wing-to-ground effect power generation device capable of changing the angle of attack by cooperating with inclined surfaces. Background Art

[0002] Large wind turbines are relatively expensive and are usually installed on relatively flat land. At the same time, three-blade wind turbines are usually installed facing the wind, with a large wind-receiving area. In addition to causing the blades to rotate circumferentially, they also cause the blades to vibrate in the incoming flow dimension. Summary of the invention

[0003] In view of the technical problems existing in the prior art, the present invention provides a wing-to-ground effect power generation device that changes the angle of attack by cooperating with an inclined surface. The present invention mainly utilizes the ground effect of the wing and the change of the angle of attack to move the airfoil up and down to generate electricity.

[0004] The technical means adopted by the present invention are as follows:

[0005] A wing-to-ground effect power generation device that changes the angle of attack by cooperating with inclined surfaces, comprising an airfoil structure, a sliding structure and an angle of attack changing structure;

[0006] The airfoil structure comprises two airfoils, the two airfoils are connected by a front connecting rod and a rear bearing rod, and a ratchet is provided at each end of the rear bearing rod;

[0007] The sliding structure comprises a slider, a pawl and a bearing; a roller is respectively arranged on the left and right sides of the slider; a cylindrical rod with a cap is arranged on the upper part of the front surface of the slider and the lower part of the rear surface, the pawl is rotatably mounted on the cylindrical rod with a cap, and the pawl is connected to the front end of the cylindrical rod with a cap by a spring sleeved on the outside of the cylindrical rod with a cap; the front end of the pawl is embedded between the teeth of the ratchet wheel; a recessed portion is arranged on the side of the rear end of the pawl close to the slider, and the recessed portion comprises an inclined surface; a through hole for mounting the bearing is arranged at the center of the slider; the rear end bearing rod passes through the bearing;

[0008] The attack angle changing structure includes a frame, a slide rail on the inner side wall of the frame, and the slider is slidably installed on the slide rail through the roller; the frame also includes two accessory outer rods arranged on the side where one of the slide rails is located and perpendicular to each other, the two accessory outer rods are arranged up and down, the accessory outer rods are perpendicular to the front end connecting rod, and the wing-shaped structure can drive the sliding structure to move up and down between the two accessory outer rods; the frame also includes bosses respectively arranged on the lower part of the front surface and the upper part of the rear surface of the side where the other slide rail is located, and the end face of one end of the boss is an inclined surface structure matching the inclined surface of the recessed portion of the pawl.

[0009] Furthermore, the front end connecting rod is a semi-cylindrical rod with a flat bottom; and the rear end bearing rod 102 is a cylindrical rod.

[0010] Furthermore, the sliding structure also includes a sliding rod installed at the bottom of the sliding block, a slideway is provided at the bottom of the frame, and the sliding rod passes through the slideway.

[0011] Furthermore, a corresponding pawl is provided on each side of the capped cylindrical rod, and a cylindrical hole matching the capped cylindrical rod is provided on the pawl, and the pawl is installed on the slider through the mutual cooperation between the capped cylindrical rod and the cylindrical hole.

[0012] Furthermore, the recessed portion is equipped with a pulley.

[0013] Furthermore, the boss located at the lower part of the aforementioned front surface corresponds to the pawl at the upper part of the front surface of the slider, and the upper end surface of the boss is the inclined structure; the boss located at the upper part of the aforementioned rear surface corresponds to the pawl at the lower part of the rear surface of the slider, and the lower end surface of the boss is the inclined structure.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The wing-to-ground effect power generation device provided by the present invention that changes the angle of attack by cooperating with inclined surfaces can, at the same speed, change the angle of attack more quickly than other wing-shaped power generation devices through the coordination of the inclined surface of the pawl recessed portion designed by the present invention and the inclined surface structure of the boss. This is because through the above-mentioned inclined surface coordination structure, after passing through the inclined surface in the forward direction, the angle of attack keeps changing under the coordination of the torque, and is locked after passing through the inclined surface in the reverse direction; after passing through the inclined surface in the forward direction, the angle of attack keeps changing downward under the action of the torque, making it easier to quickly complete the change of the angle of attack. At the same time, the frequency of up and down movement is higher, and more power is generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a schematic diagram of the structure of the power generation device of the present invention.

[0018] Figure 2 It is a schematic diagram of the airfoil structure.

[0019] Figure 3 It is a schematic diagram of the explosion of the sliding structure.

[0020] Figure 4 It is a schematic diagram of the structure of changing the angle of attack.

[0021] Figure 5 It is a schematic diagram of the boss structure.

[0022] Figure 6 It is a schematic diagram of the installation of the pawl.

[0023] Figure 7 It is a schematic diagram of the structure of the recessed portion of the pawl.

[0024] Figure 8 It is a schematic diagram of the contact state between the pawl and the boss.

[0025] Fig. 9 Schematic diagram of the contact state of the ratchet, the pawl and the boss.

[0026] Fig.10 Schematic diagram of the attack angle.

[0027] In the figure: 1. airfoil structure; 101. airfoil; 102. rear end bearing rod; 103. ratchet; 104. front end connecting rod; 2. sliding structure; 201. slider; 202. capped cylindrical rod; 203. pulley; 204. roller box; 205. ratchet; 2051. recessed portion; 206. spring; 207. roller; 208. bearing; 209. bearing ball; 210. slide rod; 3. attack angle changing structure; 301. accessory outer rod; 302. slide rail; 303. slideway; 304. boss. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0032] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0035] Example 1

[0036] like Figure 1-9 As shown, the present invention provides a wing-to-ground effect power generation device that changes the angle of attack by matching inclined surfaces, comprising an airfoil structure 1, a sliding structure 2 and an angle of attack changing structure 3;

[0037] The airfoil structure 1 includes two airfoils 101, and the two airfoils 101 are connected by a front connecting rod 104 and a rear bearing rod 102, and a ratchet 103 is provided at both ends of the rear bearing rod 102;

[0038] The front connecting rod 104 is a semi-cylindrical rod with a flat bottom; the rear bearing rod 102 is a cylindrical rod;

[0039] The sliding structure 2 includes a slider 201, a slide bar 210 installed at the bottom of the slider 201, a pawl 205 and a bearing 208; a roller box 204 is respectively provided on the left and right sides of the slider 201, and a roller 207 is installed in the roller box 204 through a horizontally arranged cylinder; a capped cylindrical rod 202 is provided on the upper part of the front surface and the lower part of the rear surface of the slider 201, and the pawl 205 is rotatably installed on the capped cylindrical rod 202. Specifically, the capped cylindrical rod 202 on each side is provided with a corresponding pawl 205 The pawl 205 is provided with a cylindrical hole matching the capped cylindrical rod 202, and the pawl 205 is installed on the slider 201 through the capped cylindrical rod 202 and the cylindrical hole, and the pawl 205 is connected to the front end of the capped cylindrical rod 202 through a spring 206 sleeved on the outside of the capped cylindrical rod 202; the front end of the pawl 205 is an inclined surface, and the inclined surfaces of the pawl 205 located on both sides of the slider 201 face oppositely; the pawl 205 is embedded between the gear teeth of the ratchet 103 through the inclined surface;

[0040] A recessed portion 2051 is provided at a side of the rear end of the ratchet 205 close to the slider 201, and the recessed portion 2051 includes an inclined surface, and a pulley 203 is installed in the recessed portion 2051; in this embodiment, the side of the ratchet 205 close to the slider 201 is referred to as the inner side of the ratchet 205, and the side away from the slider 201 is referred to as the outer side of the ratchet 205;

[0041] A through hole for mounting the bearing 208 is provided at the center of the slider 201; the rear end bearing rod 102 passes through the bearing 208, thereby realizing the connection between the airfoil structure 1 and the sliding structure 2;

[0042] The bearing 208 includes an inner bearing seat and an outer bearing seat, and 7 bearing balls 209 are arranged between the inner and outer bearing seats;

[0043] like Fig.10 As shown, the angle of attack is the angle ∠AOA between the chord and the incoming flow;

[0044] The attack angle changing structure 3 includes a frame, and two opposite inner side walls of the frame are respectively provided with slide rails 302, and the slider 201 is slidably installed on the slide rails 302 through the rollers 207 on the left and right sides, and the slider 201 can roll in the slide rails 302 through the rollers 207 to achieve up and down movement inside the frame;

[0045] A slideway 303 is provided at the bottom of the frame, and the slide bar 210 passes through the slideway 303 to guide the sliding of the slider 201;

[0046] The frame further includes two accessory outer rods 301 arranged on the side where one of the slide rails 302 is located and perpendicular to each other, the two accessory outer rods 301 are arranged up and down, the accessory outer rods 301 are perpendicular to the front connecting rod 104, and the wing-shaped structure 1 can drive the sliding structure 2 to move up and down between the two accessory outer rods 301;

[0047] When the airfoil structure 1 is slidably mounted on the frame via the slider 201 , the front connecting rod 104 faces the side where the accessory outer rod 301 is located;

[0048] The frame further comprises bosses 304 respectively arranged at the lower part of the front surface and the upper part of the rear surface of the side where the other slide rail 302 is located, and the end surface of one end of the boss 304 is an inclined surface structure matching the inclined surface of the recessed portion 2051 of the pawl 205. The setting of the inclined surface structure helps the boss 304 to push the pawl 205 to move to the outside of the pawl 205 and move along the outer surface of the boss 304 through the rolling of the pulley 203 on the inclined surface structure of the boss 304, thereby changing the angle of attack. In this process, the pulley 203 can change the sliding of the pawl 205 and the boss 304 into rolling, reducing friction. When the pawl 205 leaves the boss 304, the spring 206 can help the pawl 205 to restore its position;

[0049] When the wing-shaped structure 1 drives the sliding structure 2 to move to the position of the wedge assembly, the inclined surface structure of the boss 304 can contact the recessed portion 2051 of the pawl 205;

[0050] The boss 304 located at the lower part of the front surface corresponds to the pawl 205 at the upper part of the front surface of the slider 201, and the upper end surface of the boss 304 is the inclined surface structure; the boss 304 located at the upper part of the rear surface corresponds to the pawl 205 at the lower part of the rear surface of the slider 201, and the lower end surface of the boss 304 is the inclined surface structure;

[0051] The accessory outer rod 301 disposed on the upper side is used for the front connecting rod 104 to cooperate with the accessory outer rod 301 to generate a torque on the airfoil structure 1 after the airfoil structure 1 moves from bottom to top and touches the accessory outer rod 301 disposed on the upper side. At the same time, after the slider 201 moves upward to the point where the recessed portion 2051 of the pawl 205 located at the lower portion of the rear surface of the slider 201 contacts the corresponding inclined surface structure of the boss 304, when the slider 201 continues to move upward, the boss 304 can push the pawl 205 to move outward of the pawl 205 and thus open the constraint on the ratchet 103, thereby changing the angle of attack of the airfoil structure 1 to be negative through the torque generated by the front connecting rod 104 on the airfoil structure 1;

[0052] The accessory outer rod 301 disposed downwardly is used for the cooperation of the front connecting rod 104 and the accessory outer rod 301 to generate a torque on the airfoil structure 1 after the airfoil structure 1 moves from top to bottom and touches the accessory outer rod 301 disposed downwardly. At the same time, after the slider 201 moves downwardly to the point where the recessed portion 2051 of the pawl 205 located on the upper portion of the front surface of the slider 201 contacts the corresponding inclined surface structure of the boss 304, when it continues to move downwardly, the boss 304 can push the pawl 205 to move toward the outside of the pawl 205 and thereby open the constraint on the ratchet 103, thereby changing the angle of attack of the airfoil structure 1 to be positive through the torque generated by the front connecting rod 104 on the airfoil structure 1.

[0053] When the fluid flows over the wing surface, the fluid speeds on the upper and lower surfaces of the wing are different, which will generate a pressure difference between the upper and lower surfaces. The force generated by this pressure difference is mostly used to provide lift for the aircraft. At the same time, it is noted that the wing will generate additional lift in addition to the normal lift near the wall. This is due to the influence of the ground effect, that is, the air under the wing does not have time to diffuse due to the influence of the near wall when the wing is near the wall, and the pressure below increases. At the same time, the positive and negative pressure difference between the upper and lower surfaces can be adjusted by reasonably controlling the positive and negative angle of attack, that is, the conversion of lift and downforce can be achieved by adjusting the angle of attack. The present invention utilizes the lift principle of the airfoil and the ground effect principle in the flow field to realize the up and down movement of the wing, and converts the kinetic energy of the up and down movement into electrical energy to a certain extent, thereby achieving the purpose of power generation.

[0054] The operation process of one cycle of the power generation device of the present invention is described in detail below:

[0055] Assuming that the airfoil structure 1 starts to run from the middle and the angle of attack is positive, the airfoil structure 1 generates lift due to the ground effect and the positive angle of attack, driving the slider 201 to move upward; as the height increases, when the front connecting rod 104 of the airfoil structure 1 contacts the outer rod 301 of the attachment, a torque is generated on the airfoil structure 1; at the same time, the inclined surface of the recessed portion 2051 on the inner side of the pawl 205 cooperates with the inclined surface structure at the end of the boss 304 in the forward direction, so that the pawl 205 slides to the outside of the pawl 205 with the cooperation of the pulley 203, Thereby, the constraint of the pawl 205 on the ratchet wheels 103 on the left and right sides of the airfoil structure 1 is released, so that the airfoil structure 1 rotates downward under the action of the torque and changes to a negative angle of attack. However, at this time, the airfoil structure 1 and the slider structure 2 still move upward due to the speed brought by the initial positive angle of attack. In the process of opening the constraint of the pawl 205 and then moving upward, the pawl 205 moves along the outer side of the boss 304, and the pawl 205 does not constrain the change of the angle of attack of the airfoil structure, so the angle of attack keeps changing in the negative direction under the action of the torque.

[0056] After the downward pressure generated by the negative angle of attack offsets the upward speed, the airfoil structure 1 and the slider structure 2 begin to move downward. During the movement from the top to the middle, when the inclined surface of the recessed portion 2051 on the inner side of the pawl 205 is reversely matched with the inclined surface structure of the boss block 304, and under the action of the elastic force of the compression spring 206, the pawl 205 slides inward and finally returns to the original position, re-restricting the movement of the ratchet wheels 103 on the left and right sides of the airfoil structure 1, the angle of attack remains negative, and moves downward.

[0057] When moving downward until the front end connecting rod 104 of the wing-profile structure contacts the outer rod of the lower part 301, a torque is generated on the wing-profile structure; at the same time, the inclined surface of the recessed portion 2051 on the inner side of the pawl 205 cooperates with the inclined surface structure at the end of the boss 304 in the forward direction, so that the pawl 205 slides toward the outside of the pawl 205 with the cooperation of the pulley 203, and the constraint of the pawl 205 on the ratchet wheels 103 on the left and right sides of the wing-profile structure is opened, so that the wing-profile structure 1 rotates upward under the action of the torque and becomes a positive angle of attack, but at this time the wing-profile structure 1 and the slider structure 2 still move downward at the speed caused by the negative angle of attack; in the process of opening the constraint of the pawl 205 and then moving downward, the pawl 205 moves along the outer side of the boss 304, and the pawl 205 does not constrain the change of the angle of attack of the wing-profile structure 1, so the angle of attack changes in the positive direction under the action of the torque.

[0058] After the lift generated by the positive angle of attack offsets the downward speed, the airfoil structure 1 and the slider structure 2 start to move upward. In the process of moving from the bottom to the middle, when the inclined surface of the recessed portion 2051 on the inner side of the pawl 205 is reversely matched with the inclined surface structure at the end of the boss 304, and under the action of the elastic force of the compression spring 206, the pawl 205 slides inward and finally returns to the original position, re-limiting the movement of the ratchet wheels 103 on the left and right sides of the airfoil structure 1, maintaining the positive angle of attack, and moving upward; this reciprocating process will eventually output the kinetic energy as electrical energy.

[0059] The wing-to-ground effect power generation device provided by the present invention, which changes the angle of attack by cooperating with an inclined surface, has a low construction cost, a small wind-receiving area, small vibration, and is easy to maintain. It is more flexible than general wind power devices and can be placed at sea for wind power generation. If it is placed closer to the sea level, the wall effect can be utilized, and the power generation efficiency is higher. It can also be placed in seawater to utilize tidal or wave power generation. It can also be placed in wind zones in land mountainous areas that are not suitable for installing large-scale power generation devices based on my country's vast wind zones.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wing-to-ground effect power generation device that changes the angle of attack by cooperating with an inclined surface, characterized in that: Including airfoil structure, sliding structure and angle of attack changing structure; The airfoil structure comprises two airfoils, the two airfoils are connected by a front connecting rod and a rear bearing rod, and a ratchet is provided at each end of the rear bearing rod; The sliding structure comprises a slider, a pawl and a bearing; a roller is respectively arranged on the left and right sides of the slider; a roller box is respectively arranged on the left and right sides of the slider, and the roller is installed in the roller box through a horizontally arranged cylinder; a cylindrical rod with a cap is arranged on the upper part of the front surface of the slider and the lower part of the rear surface, the pawl is rotatably installed on the cylindrical rod with a cap, and the pawl is connected to the front end of the cylindrical rod with a cap by a spring sleeved on the outside of the cylindrical rod with a cap; the front end of the pawl is embedded between the teeth of the ratchet; a recessed portion is arranged on the side of the rear end of the pawl close to the slider, and the recessed portion comprises an inclined surface; a through hole for installing the bearing is arranged in the center of the slider; the rear end bearing rod passes through the bearing; The attack angle changing structure includes a frame, a slide rail on the inner side wall of the frame, and the slider is slidably installed on the slide rail through the roller; the frame also includes two accessory outer rods arranged on the side where one of the slide rails is located and perpendicular to each other, the two accessory outer rods are arranged up and down, the accessory outer rods are perpendicular to the front end connecting rod, and the wing-shaped structure can drive the sliding structure to move up and down between the two accessory outer rods; the frame also includes bosses respectively arranged on the lower part of the front surface and the upper part of the rear surface of the side where the other slide rail is located, and the end face of one end of the boss is an inclined surface structure matching the inclined surface of the recessed portion of the pawl.

2. The wing-to-ground effect power generation device for changing the angle of attack by means of inclined surface matching according to claim 1, characterized in that: The front end connecting rod is a semi-cylindrical rod with a flat bottom; the rear end bearing rod is a cylindrical rod.

3. The wing-to-ground effect power generation device for changing the angle of attack by means of inclined surface matching according to claim 1, characterized in that: The sliding structure further comprises a sliding rod installed at the bottom of the sliding block, a slideway is arranged at the bottom of the frame, and the sliding rod passes through the slideway.

4. The wing-to-ground effect power generation device for changing the angle of attack by means of inclined surface matching according to claim 1, characterized in that: The capped cylindrical rod on each side is provided with a corresponding pawl, and the pawl is provided with a cylindrical hole matching the capped cylindrical rod, and the pawl is installed on the slider through the mutual cooperation between the capped cylindrical rod and the cylindrical hole.

5. The wing-to-ground effect power generation device for changing the angle of attack by means of inclined surface matching according to claim 1, characterized in that: The recessed portion is provided with a pulley.

6. The wing-to-ground effect power generation device for changing the angle of attack by means of inclined surface coordination according to claim 1, characterized in that: The boss located at the lower part of the aforementioned front surface corresponds to the pawl at the upper part of the front surface of the slider, and the upper end surface of the boss is the inclined structure; the boss located at the upper part of the aforementioned rear surface corresponds to the pawl at the lower part of the rear surface of the slider, and the lower end surface of the boss is the inclined structure.

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