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

Abstract

The present invention provides a wing-to-ground effect power generation device that changes the angle of attack by cooperating with a wedge. The device comprises an airfoil structure, a sliding structure, and an angle-of-attack changing structure. The airfoil structure comprises two airfoils, a front connecting rod, and a rear bearing rod, with a ratchet wheel disposed at each end of the rear bearing rod. The sliding structure comprises a slider, a pawl, and a bearing. The slider is provided with a protrusion and a pawl fixing rod. The front end of the pawl is embedded in the tooth groove of the ratchet wheel. The rear bearing rod passes through the bearing. The angle-of-attack changing structure comprises a frame, within which the slider is slidably mounted. The frame also comprises two accessory outer rods, and the airfoil structure is capable of driving the sliding structure to move up and down between the two accessory outer rods. The frame also comprises a wedge assembly, which comprises a transverse cylinder, a vertical cylinder, a spring II, and a wedge. When the airfoil structure drives the sliding structure to the position of the wedge assembly, the wedge can contact the lateral ratchet blocks of the pawl. The present invention has low construction cost, a small wind-exposed area, low vibration, and is easy to maintain.

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 wedges. Background Art

[0002] Large-scale wind turbines are relatively expensive and generally require installation locations on relatively flat land. At the same time, three-blade wind turbines are generally installed facing the wind, with a large wind-exposed 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] To address the technical problems of the prior art, the present invention provides a wing-to-ground effect power generation device that changes the angle of attack by cooperating with wedges. 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 in the present invention are as follows:

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

[0006] The airfoil structure includes two airfoils, which 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 includes a slider, a pawl, and a bearing; a roller is provided on the left and right sides of the slider respectively; a protrusion and a pawl fixing rod are provided on the upper portion of the front surface and the lower portion of the rear surface of the slider; the pawl is rotatably mounted on the pawl fixing rod, and the side ratchet blocks of the pawl are connected to the protrusions on the corresponding surface via spring I; the front end of the pawl is embedded in the tooth groove of the ratchet wheel; a through hole for mounting the bearing is provided in the center of the slider; the rear end bearing rod passes through the bearing;

[0008] The angle of attack changing structure includes a frame, two inner side walls opposite to each other of the frame are respectively provided with slide rails, and the slider is slidably mounted on the slide rails by rollers; 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 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 two lower parts of the front surface and rear surface respectively provided on the side where the other slide rail is located. The wedge block assembly comprises a transverse cylinder, a vertical cylinder, a spring II and a wedge block. The transverse cylinder and the vertical cylinder are respectively mounted on the frame through protrusions. The transverse cylinder is perpendicular to the mounting surface. One end of the wedge block is rotatably mounted on the transverse cylinder. The vertical cylinder is perpendicular to the transverse cylinder, and one end extends into the interior of the wedge block. The spring II is sleeved outside the vertical cylinder. When the wing-shaped structure drives the sliding structure to move to the position of the wedge block assembly, the wedge block can contact the side ratchet block 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 is a cylindrical rod.

[0010] Furthermore, a roller box is provided on the left and right sides of the sliding block respectively, and the rollers are installed in the roller boxes through horizontally arranged cylinders.

[0011] Furthermore, the sliding structure further 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.

[0012] Furthermore, the wedge block can rotate around the transverse cylinder toward the side where the vertical cylinder is located, and the protrusion for fixing the transverse cylinder can limit the wedge block from rotating to the other side.

[0013] Furthermore, the wedge block assembly 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 in the wedge block assembly, the vertical cylinder and spring II are located above the transverse cylinder and the wedge block; the wedge block assembly 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 in the wedge block assembly, the vertical cylinder and spring II are located below the transverse cylinder and the wedge block.

[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, which changes the angle of attack by cooperating with wedge blocks, has low construction cost, a small wind-exposed area, small vibration, and is easy to maintain. Compared with general wind power devices, it is more flexible and can be placed at sea for wind power generation. If it is placed close to the sea level, the wall effect will be utilized, and the power generation efficiency will be higher. It can also be placed in seawater to utilize tides or waves for 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. 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative labor.

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

[0018] Figure 2 Schematic diagram of the airfoil structure.

[0019] Figure 3 Schematic diagram of the explosion of the sliding structure.

[0020] Figure 4 Schematic diagram of the structure for changing the angle of attack.

[0021] Figure 5 for Figure 4 Partially enlarged schematic diagram.

[0022] Figure 6 Schematic diagram of the wedge assembly structure.

[0023] Figure 7 It is a schematic diagram of the contact state between the wedge block, the pawl and the ratchet wheel.

[0024] Figure 8 It is a schematic diagram of the side ratchet block structure of the wedge block and the pawl.

[0025] Figure 9 Schematic diagram of the angle of attack.

[0026] 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. Protrusion; 203. Pawl fixing rod; 204. Roller box; 205. Pawl; 206. Spring I; 207. Roller; 208. Bearing; 209. Bearing ball; 210. Sliding rod; 3. Attack angle changing structure; 301. Accessory outer rod; 302. Slide rail; 303. Slideway; 304. Horizontal cylinder; 305. Vertical cylinder; 306. Spring II; 307. Wedge block; 308. Protrusion for fixing the horizontal cylinder. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention 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.

[0028] 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 in no way 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 making creative work are within the scope of protection of the present invention.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments 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 those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0031] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying 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 outline of each component itself.

[0032] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0033] 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. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0034] Example 1

[0035] like Figure 1-8 As shown, the present invention provides a wing-to-ground effect power generation device that changes the angle of attack by cooperating with wedges, comprising an airfoil structure 1, a sliding structure 2, and an angle of attack changing structure 3;

[0036] The airfoil structure 1 includes two airfoils 101, which are connected by a front connecting rod 104 and a rear bearing rod 102. A ratchet 103 is provided at each end of the rear bearing rod 102.

[0037] The front connecting rod 104 is a semi-cylindrical rod with a flat bottom; the rear bearing rod 102 is a cylindrical rod;

[0038] The sliding structure 2 includes a slider 201, a sliding rod 210 installed at the bottom of the slider 201, a pawl 205 and a bearing 208; a roller box 204 is 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; the upper part of the front surface and the lower part of the rear surface of the slider 201 are both provided with a protrusion 202 and a pawl fixing rod 203, the pawl 205 is rotatably installed on the pawl fixing rod 203, and the side ratchet block of the pawl 205 is connected to the protrusion 202 on the corresponding surface through a spring I 206; the two ends of the spring I 206 are respectively fixed to the side ratchet block of the pawl 205 and the protrusion 202 on the corresponding surface; the front end of the pawl 205 is embedded in the tooth groove of the ratchet wheel 103;

[0039] The center of the slider 201 is provided with a through hole for mounting the bearing 208; the rear end bearing rod 102 passes through the bearing 208, thereby achieving the connection between the airfoil structure 1 and the sliding structure 2;

[0040] The bearing 208 includes an inner and outer bearing seat, and 7 bearing balls 209 are arranged between the inner and outer bearing seats. The bearing 208 cooperates with the ratchet 103 and the rear end bearing rod 102 to achieve the function of changing the attack angle by rotating; Figure 9 As shown, the angle of attack is the angle ∠AOA between the chord and the incoming flow;

[0041] The attack angle changing structure 3 includes a frame, and two opposing inner side walls of the frame are respectively provided with slide rails 302. The slider 201 is slidably mounted on the slide rails 302 via the rollers 207 on the left and right sides. The slider 201 can move up and down within the frame by rolling within the slide rails 302 via the rollers 207. A slide rail 303 is provided at the bottom of the frame, and the slide rod 210 passes through the slide rail 303 to guide the sliding of the slider 201.

[0042] The frame further includes two accessory outer rods 301 disposed on the side of one of the slide rails 302 and perpendicular to each other. The two accessory outer rods 301 are disposed one above the other and are perpendicular to the front connecting rod 104. The wing-shaped structure 1 can drive the sliding structure 2 to move up and down between the two accessory outer rods 301.

[0043] 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;

[0044] The frame also includes a wedge block assembly 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 302 is located, and the wedge block assembly includes a horizontal cylinder 304, a vertical cylinder 305, a spring II 306 and a wedge block 307. The horizontal cylinder 304 and the vertical cylinder 305 are respectively installed on the frame through protrusions. The horizontal cylinder 304 is perpendicular to the installation surface. One end of the wedge block 307 is rotatably installed on the horizontal cylinder 304. The vertical cylinder 305 is perpendicular to the horizontal cylinder 304 and one end extends into the interior of the wedge block 307. The spring II 306 is sleeved outside the vertical cylinder 305. The wedge block 307 can rotate around the horizontal cylinder 304 toward the side where the vertical cylinder 305 is located. The protrusion 308 for fixing the horizontal cylinder 304 can limit the wedge block 307 from rotating to the other side.

[0045] When the wing-shaped structure 1 drives the sliding structure 2 to move to the position of the wedge assembly, the wedge 307 can contact the side ratchet of the pawl 205;

[0046] The side ratchet blocks of the pawl 205 are arranged on the inclined surfaces matching the inclined surfaces of the wedge block 307, which helps the wedge block 307 to push the side ratchet blocks of the pawl 205 to move;

[0047] The wedge assembly located at the lower portion of the front surface corresponds to the pawl 205 at the upper portion of the front surface of the slider 201. In the wedge assembly, the vertical cylinder 305 and the spring II 306 are located above the transverse cylinder 304 and the wedge 307. The wedge assembly located at the upper portion of the rear surface corresponds to the pawl 205 at the lower portion of the rear surface of the slider 201. In the wedge assembly, the vertical cylinder 305 and the spring II 306 are located below the transverse cylinder 304 and the wedge 307.

[0048] The accessory outer rod 301 provided on the upper side is used for, when the airfoil structure 1 moves from bottom to top and touches the accessory outer rod 301 provided on the upper side, the front connecting rod 104 cooperates with the accessory outer rod 301 to generate a torque on the airfoil structure 1. At the same time, after the slider 201 moves upward until the lateral ratchet blocks of the pawl 205 located at the lower part of the rear surface of the slider 201 come into contact with the corresponding wedge blocks 307, when it continues to move upward, the wedge blocks 307 can push the lateral ratchet blocks of the pawl 205 to move and thereby drive the ratchet wheel 103 to rotate, thereby changing the angle of attack of the airfoil structure 1 to negative through the rear end bearing rod 102;

[0049] The accessory outer rod 301 provided at the bottom is used for, when the airfoil structure 1 moves from top to bottom and touches the accessory outer rod 301 provided at the bottom, the front connecting rod 104 cooperates with the accessory outer rod 301 to generate a torque on the airfoil structure 1. At the same time, when the slider 201 moves downward until the lateral ratchet blocks of the pawl 205 located on the upper front surface of the slider 201 come into contact with the corresponding wedge blocks 307, when it continues to move downward, the wedge blocks 307 can push the lateral ratchet blocks of the pawl 205 to move and thereby drive the ratchet wheel 103 to rotate, thereby changing the angle of attack of the airfoil structure 1 to be positive through the rear end bearing rod 102;

[0050] In the present application, the wedge block 307 is used to change the angle of attack, and the direction of rotation can only be toward the side where the vertical cylinder 305 is located. The transverse cylinder 304, the vertical cylinder 305 and the spring II 306 can limit the freedom of the wedge block 307. The function of the spring II 306 is to allow the side ratchet block of the pawl 205 to pass through the wedge block 307 smoothly when the slider 201 moves in the opposite direction after the angle of attack is changed, and to allow the wedge block 307 to return to its original position after passing.

[0051] When fluid flows through the airfoil, the fluid speed is different on the airfoil surface, which will produce 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 airfoil will produce 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 below 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 power generation device described in the present invention utilizes the lift principle and ground effect principle of the airfoil in the flow field to realize the up and down movement of the airfoil, 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.

[0052] The following describes in detail the operation process of one cycle of the power generation device of the present invention:

[0053] Assuming that the airfoil structure 1 starts running 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 upward. As the height increases, when the front connecting rod 104 of the airfoil structure 1 contacts the upper attachment outer rod 301, a torque is generated on the airfoil structure 1.

[0054] At the same time, the side ratchet blocks of the pawl 205 cooperate with the wedge block 307 in the forward direction to release the constraint of the side ratchet blocks of the pawl 205 on the ratchet 103, so that the airfoil structure 1 rotates downward under the action of the torque to a negative angle of attack. However, at this time, the airfoil structure 1 and the slider 201 still move upward due to the speed brought by the initial positive angle of attack. When the side ratchet blocks of the pawl 205 no longer contact the wedge block 307, the front end of the pawl 205 is again embedded in the teeth of the ratchet 103 to constrain the movement of the ratchet 103.

[0055] After the downward force generated by the negative angle of attack offsets the upward velocity, the airfoil structure 1 and the slider 201 begin to move downward. During the movement from the top to the middle, the side ratchet blocks of the pawl 205 will cooperate with the wedge block 307 in the reverse direction, causing the wedge block 307 to compress the spring II 306 downward along the vertical cylinder 305. At this time, the pawl 205 will not release the constraint due to the reverse contact, and the angle of attack will still be negative. When the side ratchet blocks of the pawl 205 no longer contact the wedge block 307, the wedge block 307 will return to its original position under the elastic force of the spring II 306.

[0056] When the front end connecting rod 104 of the wing-profile structure 1 moves downward and contacts the outer accessory rod 301 arranged downward, a torque is generated on the wing-profile structure 1; at the same time, the side ratchet block of the pawl 205 cooperates with the wedge block 307 in the forward direction to release the constraint of the pawl 205 on the ratchet 103, so that the wing-profile structure 1 rotates downward under the action of the torque to a positive angle of attack. However, at this time, the wing-profile structure 1 and the slider 201 still move downward at the speed caused by the negative angle of attack; when the side ratchet block of the pawl 205 no longer contacts the wedge block 307, the front end of the pawl 205 is again embedded in the teeth of the ratchet 103 to constrain the movement of the ratchet 103;

[0057] After the lift generated by the positive angle of attack offsets the downward velocity, the airfoil structure 1 and the slider 201 begin to move upward. During the movement from the bottom to the middle, the side ratchet blocks of the pawl 205 will cooperate with the wedge block 307 in the reverse direction, causing the lower wedge block 307 to compress the spring II 306 upward along the vertical cylinder 305. At this time, the pawl 205 will not open the constraint due to the reverse contact, and the angle of attack will still be positive; when the side ratchet blocks of the pawl 205 no longer contact the wedge block 307, the wedge block 307 will return to its original state under the action of the elastic force of the spring II 306; this reciprocating process will eventually output the kinetic energy as electrical energy.

[0058] 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 with 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 wedges, characterized in that: Including airfoil structure, sliding structure and angle of attack changing structure; The airfoil structure includes two airfoils, which 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 includes a slider, a pawl and a bearing; a roller is provided on the left and right sides of the slider respectively; a protrusion and a pawl fixing rod are 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 pawl fixing rod, and the side ratchet block of the pawl is connected to the protrusion on the corresponding surface by a spring I; the front end of the pawl is embedded in the tooth groove of the ratchet; a through hole for mounting the bearing is provided in the center of the slider; the rear end bearing rod passes through the bearing; the bearing includes inner and outer bearing seats, and 7 bearing balls are provided between the inner and outer bearing seats, and the bearing cooperates with the ratchet and the rear end bearing rod to achieve the function of changing the attack angle through rotation; The angle of attack changing structure includes a frame, two inner side walls opposite to each other of the frame are respectively provided with slide rails, and the slider is slidably mounted on the slide rails by rollers; 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 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 wedge block assemblies 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 wedge assembly It includes a transverse cylinder, a vertical cylinder, a spring II and a wedge block. The transverse cylinder and the vertical cylinder are respectively installed on the frame through protrusions. The transverse cylinder is perpendicular to the installation surface. One end of the wedge block is rotatably installed on the transverse cylinder. The vertical cylinder is perpendicular to the transverse cylinder and one end extends into the interior of the wedge block. The spring II is sleeved outside the vertical cylinder. When the wing-shaped structure drives the sliding structure to move to the position of the wedge block assembly, the wedge block can contact the side ratchet block of the pawl. The side ratchet block of the pawl is provided with an inclined surface that matches the inclined surface of the wedge block.

2. The wing-to-ground effect power generation device for changing the angle of attack by wedge cooperation 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 with a wedge-type block for changing the angle of attack according to claim 1, characterized in that: A roller box is respectively provided on the left and right sides of the sliding block, and the rollers are installed in the roller boxes through horizontally arranged cylinders.

4. The wing-to-ground effect power generation device for changing the angle of attack by wedge cooperation 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 provided at the bottom of the frame, and the sliding rod passes through the slideway.

5. The wing-to-ground effect power generation device for changing the angle of attack by wedge cooperation according to claim 1, characterized in that: The wedge block can rotate around the transverse cylinder toward the side where the vertical cylinder is located, and the protrusion for fixing the transverse cylinder can limit the wedge block from rotating toward the other side.

6. The wing-to-ground effect power generation device for changing the angle of attack by wedge cooperation according to claim 1, characterized in that: The wedge block assembly 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 in the wedge block assembly, the vertical cylinder and spring II are located above the transverse cylinder and the wedge block; the wedge block assembly 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 in the wedge block assembly, the vertical cylinder and spring II are located below the transverse cylinder and the wedge block.

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