Fixing support of photovoltaic power generation panel

Abstract

The invention relates to a fixing support of a photovoltaic power generation panel, and belongs to the technical field of photovoltaic power generation panel installation. The fixing support of the photovoltaic power generation panel comprises a base and a mounting frame, the base is used for being stably connected with the mounting ground, and the mounting frame is used for being connected with the photovoltaic power generation panel; the adjusting mechanism comprises a mounting box fixedly connected to the base; the first motor and the bevel gear in the adjusting mechanism are matched with each other, the corresponding first connecting rod and the second connecting rod are driven to rotate through forward rotation and reverse rotation respectively, the second connecting rod can adjust the angle, the first connecting rod can adjust the locking state of the device, the first connecting rod and the second connecting rod cannot conflict, and locking operation of the circular ring and the base is achieved through the locking plate; the stability of the device during use is improved, operation is simple, multiple locking operation can be achieved only through reverse rotation of the first motor, the steps of locking the device are reduced, the device is more convenient to use and good in stability, and the use effect of the device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation panel installation, and in particular to a fixing bracket for a photovoltaic power generation panel. Background Art

[0002] Photovoltaic power generation is a technology that uses the photovoltaic effect of semiconductor interfaces to directly convert light energy into electrical energy. It mainly consists of three parts: solar panels (modules), controllers and inverters. The main components are made of electronic components. Solar cells are packaged and protected after being connected in series to form large-area solar cell modules. Combined with power controllers and other components, a photovoltaic power generation device is formed. At present, due to different latitudes and seasonal changes, the optimal angle for photovoltaic panels to be exposed to sunlight is constantly changing. In order to allow photovoltaic panels to receive the best sunlight exposure, they need to be installed using adjustable mounting frames.

[0003] After searching, the Chinese patent "An Adjustable Photovoltaic Power Generation Installation Fixing Device" authorization announcement number "CN218958831 U" is provided with a fixing plate, an arc-shaped rack plate, a motor and a gear. The motor drives the gear to rotate, and the gear drives the arc-shaped rack plate to rotate, driving the mounting plate located at the upper end of the connecting block to rotate, so as to facilitate the adjustment of the angular position of the mounting plate and improve the practical performance of the bracket; through the provision of a bottom plate, a rotating rod, a shell, a connecting plate and a slider, the bottom plate is installed on the upper end of the ground body, and then the shell is rotated to drive the connecting plate to rotate. The slider located at the upper end of the bottom plate rotates, which can adjust the angle of the shell, and the fixing bolt rotates the connecting plate, so as to facilitate the rotation of the position of the mounting plate;

[0004] Although the above application can realize the rotation adjustment of the photovoltaic panels on the mounting frame to achieve the effect of improving the sunlight exposure of the photovoltaic panels, the above-mentioned base plate and connecting plate are locked by fixing bolts after rotation. This operation is relatively cumbersome and the device needs to be adjusted frequently when in use. At the same time, the mounting frame is installed outdoors all year round and the solar panels are connected only by a hinged method, which has poor stability and affects the use effect of the device. Summary of the Invention

[0005] Based on this, it is necessary to provide a fixing bracket for photovoltaic panels to address the problems that the adjustment is cumbersome and the device needs to be adjusted frequently during use, and the solar panels are connected only by a hinged manner, which has poor stability and affects the use effect of the device.

[0006] A fixing bracket for a photovoltaic panel, comprising:

[0007] A base and a mounting frame, wherein the base is used to be stably connected to the installation ground, and the mounting frame is used to connect the photovoltaic panels;

[0008] An adjustment mechanism includes a mounting box fixedly connected to the base, an inner bottom wall of the mounting box being rotatably connected to a first connecting rod, a top end of the first connecting rod being rotatably connected to a second connecting rod, a top end of the second connecting rod passing through the mounting box and fixedly connected to a mounting rod, the mounting rod being hinged to the mounting frame, a first motor being fixedly installed in the mounting box, and a bevel gear being fixedly connected to the surfaces of the output shaft of the first motor, the first connecting rod, and the second connecting rod;

[0009] The surface of the mounting rod is fixedly connected to a circular ring rotatably connected to the base, the top of the circular ring is fixedly connected to the cylinder body, the inner top wall of the cylinder body is fixedly connected to a first spring, the other end of the first spring is fixedly connected to a locking plate, and the other end of the locking plate passes through the cylinder body and the circular ring in sequence;

[0010] An air storage frame connected to the cylinder body is fixedly connected to the inside of the installation box, a second spring is fixedly connected to the inner wall of the air storage frame, the other end of the second spring is fixedly connected to a piston plate, the other end of the piston plate passes through the air storage frame and is fixedly connected to a contact plate, and a cam used in conjunction with the contact plate is fixedly connected to the surface of the first connecting rod.

[0011] In one embodiment, the adjustment mechanism also includes a second motor fixedly connected to the mounting rod, the bottom end of the mounting frame is fixedly connected to a ring gear, the output shaft of the second motor is fixedly connected to a circular gear meshing with the ring gear, a limit block is fixedly connected to the mounting rod, the bottom end of the mounting frame is fixedly connected to a limit arc plate slidably connected to the limit block, a first support rod is hinged on the mounting rod, and a second support rod is provided between the first support rod and the mounting frame.

[0012] In one embodiment, the three bevel gears are meshed and connected, and one-way bearings are provided on the surfaces of the first connecting rod and the second connecting rod.

[0013] In one embodiment, a circular groove is provided at the top of the base, and a sliding rod is fixedly connected to the bottom end of the circular ring and is slidably connected to the circular groove.

[0014] In one embodiment, an air pipe is provided between the two first support rods, and the air pipe is connected to the cylinder body.

[0015] In one embodiment, a third support rod is hingedly connected to the bottom end of the mounting frame, a third spring is fixedly connected to the inner wall of the third support rod, and the other end of the third spring is fixedly connected to the second support rod.

[0016] In one embodiment, the limit block is U-shaped, the inner wall of the limit block is in non-pressure contact with the limit arc plate, a round rod is fixedly connected inside the limit block, and the round rod is slidably connected to the limit arc plate.

[0017] In one embodiment, two mounting grooves are provided in the limit block, a fourth spring is fixedly connected to the inner wall of the mounting groove, the other end of the fourth spring is fixedly connected to a brake plate, and an airbag connected to the first support rod is provided between the mounting groove and the brake plate.

[0018] In one embodiment, the brake plate is a high-strength rubber component, and the brake plate extends out of the mounting slot and contacts the limiting arc plate.

[0019] In one embodiment, a resistance-increasing pad is provided at the bottom end of the locking plate, and evenly distributed grooves are formed at the bottom end of the resistance-increasing pad.

[0020] The first motor and the bevel gear in the above-mentioned adjustment mechanism cooperate with each other, and can, under the action of the one-way bearing, respectively drive the corresponding first connecting rod and the second connecting rod to rotate by forward and reverse rotation, so that the second connecting rod can adjust the angle, and the first connecting rod can adjust the locking state of the device, and the two will not conflict. At the same time, gas can enter the cylinder body, and the locking plate is used to realize the locking operation of the ring and the base, thereby increasing the stability of the device when in use. At the same time, the fluidity of the gas can simultaneously realize the locking operation between the first support rod and the mounting frame, the limit arc plate and the limit block. The operation is simple, and multiple locking operations can be realized by only rotating the first motor in the opposite direction, reducing the steps when locking the device, making the device more convenient and stable when in use, and improving the use effect of the device;

[0021] The first support rod, the second support rod, the third spring and the third support rod cooperate with each other to increase the stability of the mounting frame during adjustment. When locking, gas enters the first support rod to squeeze it, so that the first support rod, the second support rod, the third spring and the third support rod form a stable support structure, thereby increasing the stability of the device during operation.

[0022] The cooperation between the limit block and the limit arc plate can increase the stability of the installation frame when adjusting the tilt angle, and they are interconnected with the first support rod, which can drive the brake plate to make close contact with the limit arc plate. The structural components similar to brakes increase the stability between the limit block and the limit arc plate when the device is working. When affected by external factors, the device can still maintain a relatively stable state, thereby improving the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to 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 work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 An exploded view of the present invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of the installation box of the present invention;

[0027] Figure 4 is a cross-sectional view of the adjustment mechanism of the present invention;

[0028] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0029] Figure 6 For the present invention Figure 4 Enlarged view of point B in the middle;

[0030] Figure 7 This is a schematic diagram of the connection between the limiting arc plate and the limiting block of the present invention;

[0031] Figure 8 Schematic diagram of the internal structure of the limit block of the present invention.

[0032] Reference numerals:

[0033] 100, base; 110, circular groove; 200, adjustment mechanism; 210, mounting box; 211, first connecting rod; 212, second connecting rod; 213, first motor; 214, bevel gear; 215, one-way bearing; 216, cam; 217, mounting rod; 220, circular ring; 221, cylinder; 222, first spring; 223, locking plate; 224, slide rod; 225, gas storage frame; 226, second spring; 2 27. Piston plate; 228. Contact plate; 230. Second motor; 231. Circular gear; 232. Ring gear; 233. Limiting arc plate; 234. Limiting block; 2341. Mounting groove; 2342. Fourth spring; 2343. Brake plate; 2344. Airbag; 250. First support rod; 251. Second support rod; 252. Air pipe; 253. Third spring; 254. Third support rod; 300. Mounting frame. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present invention are for illustrative purposes only and do not represent the only implementation method.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0037] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] Unless otherwise defined, all technical and scientific terms used in the present description have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used in this description are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used in this description includes any and all combinations of one or more of the associated listed items.

[0039] The following combination Figures 1-8 The fixing bracket of the photovoltaic panel of the present invention is described.

[0040] In one embodiment, a fixing bracket for a photovoltaic panel includes:

[0041] Base 100 and mounting frame 300, base 100 is used to be stably connected to the installation ground, and mounting frame 300 is used to connect the photovoltaic panels;

[0042] The adjustment mechanism 200 includes a mounting box 210 fixedly connected to the base 100. The inner bottom wall of the mounting box 210 is rotatably connected to a first connecting rod 211. The top end of the first connecting rod 211 is rotatably connected to a second connecting rod 212. The top end of the second connecting rod 212 passes through the mounting box 210 and is fixedly connected to a mounting rod 217. The mounting rod 217 is hinged to the mounting frame 300. A first motor 213 is fixedly installed in the mounting box 210. The output shaft of the first motor 213, the surfaces of the first connecting rod 211, and the second connecting rod 212 are all fixedly connected to a bevel gear 214.

[0043] A circular ring 220 rotatably connected to the base 100 is fixedly connected to the surface of the mounting rod 217. A cylinder 221 is fixedly connected to the top of the circular ring 220. A first spring 222 is fixedly connected to the inner top wall of the cylinder 221. The other end of the first spring 222 is fixedly connected to a locking plate 223. The other end of the locking plate 223 passes through the cylinder 221 and the circular ring 220 in sequence.

[0044] An air storage frame 225 connected to the cylinder body 221 is fixedly connected inside the mounting box 210, a second spring 226 is fixedly connected to the inner wall of the air storage frame 225, the other end of the second spring 226 is fixedly connected to a piston plate 227, the other end of the piston plate 227 passes through the air storage frame 225 and is fixedly connected to a contact plate 228, and a cam 216 used in conjunction with the contact plate 228 is fixedly connected to the surface of the first connecting rod 211.

[0045] like Figure 2 、 Figure 4 、 Figure 5 and Figure 6 As shown, the adjustment mechanism 200 also includes a second motor 230 fixedly connected to the mounting rod 217, a ring gear 232 is fixedly connected to the bottom end of the mounting frame 300, the output shaft of the second motor 230 is fixedly connected to a circular gear 231 meshing with the ring gear 232, a limiting block 234 is fixedly connected to the mounting rod 217, and a limiting arc plate 233 slidingly connected to the limiting block 234 is fixedly connected to the bottom end of the mounting frame 300, a first support rod 250 is hinged on the mounting rod 217, and a second support rod 251 is provided between the first support rod 250 and the mounting frame 300.

[0046] An air delivery pipe 252 is provided between the two first support rods 250 , and the air delivery pipe 252 is communicated with the cylinder body 221 .

[0047] A third support rod 254 is hinged to the bottom end of the mounting frame 300 . A third spring 253 is fixedly connected to the inner wall of the third support rod 254 . The other end of the third spring 253 is fixedly connected to the second support rod 251 .

[0048] In this embodiment, the gas in the cylinder 221 will enter the first support rod 250 from the gas pipe 252, and the gas will squeeze the second support rod 251, so that the second support rod 251 moves toward the mounting frame 300 within the movable range. At the same time, the second support rod 251 squeezes the third spring 253, so that the first support rod 250, the second support rod 251, the third spring 253 and the third support rod 254 form a stable support structure, thereby realizing the locking operation between the first support rod 250 and the mounting frame 300.

[0049] like Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, three bevel gears 214 are meshed and connected, and one-way bearings 215 are provided on the surfaces of the first connecting rod 211 and the second connecting rod 212 .

[0050] The top of the base 100 is provided with a circular groove 110, and the bottom of the circular ring 220 is fixedly connected to a slide rod 224 that is slidably connected to the circular groove 110. When the circular ring 220 rotates, it will simultaneously drive the slide rod 224 to rotate within the circular groove 110, increasing the stability of the circular ring 220, the mounting rod 217, and the mounting frame 300 during rotation.

[0051] The bottom end of the locking plate 223 is provided with a resistance-enhancing pad, and the bottom end of the resistance-enhancing pad is provided with evenly distributed grooves. The resistance-enhancing pad will directly contact the base 100 to achieve a locking operation between the two.

[0052] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, the limiting block 234 is U-shaped, the inner wall of the limiting block 234 is in non-pressure contact with the limiting arc plate 233, a round rod is fixedly connected inside the limiting block 234, and the round rod is slidably connected to the limiting arc plate 233.

[0053] Two mounting grooves 2341 are defined in the limit block 234. A fourth spring 2342 is fixedly connected to the inner wall of the mounting groove 2341. A brake plate 2343 is fixedly connected to the other end of the fourth spring 2342. An air bag 2344 connected to the first support rod 250 is provided between the mounting groove 2341 and the brake plate 2343.

[0054] The brake plate 2343 is a high-strength rubber component, and the brake plate 2343 extends out of the mounting slot 2341 and contacts the limiting arc plate 233 .

[0055] In this embodiment, part of the gas in the first support rod 250 will enter the airbag 2344, and the airbag 2344 will expand, squeezing the brake plate 2343, causing the brake plate 2343 to extend out of the installation groove 2341 and come into close contact with the limiting arc plate 233, thereby locking the limiting block 234 and the limiting arc plate 233, so that the entire device is in a stable locked state.

[0056] Working principle: The photovoltaic panel needs to be installed in the installation frame 300, the base 100 needs to be installed on the installation ground, and then other supporting equipment is completed to realize the normal power generation operation of the photovoltaic panel. When the device needs to be adjusted according to the on-site conditions, when the angle of the installation frame 300 needs to be adjusted, the second motor 230 is started, and the circular gear 231 is used to drive the gear ring 232 to rotate, thereby realizing the adjustment of the inclination angle of the installation frame 300. During the adjustment process, the limit arc plate 233 will cooperate with the limit block 234 to prevent it from deviating. The first supporting rod 250, the second supporting rod 251 and the third supporting rod 254 are automatically adjusted to support the mounting frame 300; the first motor 213 is started and rotated clockwise, thereby utilizing the adjacent bevel gear 214 to rotate, thereby driving the second connecting rod 212 to rotate, utilizing the second connecting rod 212 to drive the mounting rod 217 to rotate, and the mounting frame 300 will rotate synchronously, thereby achieving the adjustment of the rotation angle. When the debugging is completed, the first motor 213 rotates counterclockwise, thereby driving the first connecting rod 211 to rotate, utilizing the cam 216 The contact plate 228 is squeezed, thereby driving the piston plate 227 to squeeze the gas in the gas storage frame 225, and the internal gas will enter the cylinder 221. The gas drives the locking plate 223 to move downward and contact the base 100, thereby locking the ring 220 and the mounting rod 217 with the base 100. Part of the gas will enter the first support rod 250, and the gas will squeeze the second support rod 251, so that the second support rod 251 moves toward the mounting frame 300 within the movable range. At the same time, the second support rod 251 presses the third spring 2 53 is squeezed, so that the first support rod 250, the second support rod 251, the third spring 253 and the third support rod 254 form a stable supporting structure, and part of the gas in the first support rod 250 will enter the airbag 2344. The airbag 2344 expands and squeezes the brake plate 2343, so that the brake plate 2343 extends out of the installation groove 2341 and is in close contact with the limiting arc plate 233, thereby locking the limiting block 234 and the limiting arc plate 233, so that the entire device is in a stable locking state, ensuring the stability of the photovoltaic panel during operation.

[0057] It should be noted that the first motor 213, the second motor 230, etc. in the above description are all devices with relatively mature applications in existing technologies. The specific models can be selected according to actual needs. At the same time, the first motor 213 and the second motor 230 can be powered by a built-in power supply or by AC power. The specific power supply method is selected according to the situation and will not be elaborated here.

[0058] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of the present invention. Therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. A fixing bracket for a photovoltaic panel, characterized in that: include: A base (100) and a mounting frame (300), wherein the base (100) is used to be stably connected to an installation ground, and the mounting frame (300) is used to connect a photovoltaic power generation panel; An adjusting mechanism (200), the adjusting mechanism (200) comprising a mounting box (210) fixedly connected to a base (100), the inner bottom wall of the mounting box (210) being rotatably connected to a first connecting rod (211), the top end of the first connecting rod (211) being rotatably connected to a second connecting rod (212), the top end of the second connecting rod (212) passing through the mounting box (210) and being fixedly connected to a mounting rod (217), the mounting rod (217) being hinged to a mounting frame (300), a first motor (213) being fixedly installed in the mounting box (210), and the output shaft of the first motor (213), the surfaces of the first connecting rod (211) and the second connecting rod (212) being fixedly connected to a bevel gear (214); A circular ring (220) rotatably connected to the base (100) is fixedly connected to the surface of the mounting rod (217); a cylinder body (221) is fixedly connected to the top of the circular ring (220); a first spring (222) is fixedly connected to the inner top wall of the cylinder body (221); a locking plate (223) is fixedly connected to the other end of the first spring (222); and the other end of the locking plate (223) passes through the cylinder body (221) and the circular ring (220) in sequence; An air storage frame (225) in communication with the cylinder body (221) is fixedly connected inside the installation box (210); a second spring (226) is fixedly connected to the inner wall of the air storage frame (225); the other end of the second spring (226) is fixedly connected to a piston plate (227); the other end of the piston plate (227) passes through the air storage frame (225) and is fixedly connected to a contact plate (228); and a cam (216) used in conjunction with the contact plate (228) is fixedly connected to the surface of the first connecting rod (211).

2. The fixing bracket of the photovoltaic panel according to claim 1, characterized in that: The adjustment mechanism (200) further comprises a second motor (230) fixedly connected to the mounting rod (217); a gear ring (232) is fixedly connected to the bottom end of the mounting frame (300); an output shaft of the second motor (230) is fixedly connected to a circular gear (231) meshingly connected to the gear ring (232); a limit block (234) is fixedly connected to the mounting rod (217); a limit arc plate (233) slidably connected to the limit block (234) is fixedly connected to the bottom end of the mounting frame (300); a first support rod (250) is hingedly connected to the mounting rod (217); and a second support rod (251) is provided between the first support rod (250) and the mounting frame (300).

3. The fixing bracket of the photovoltaic panel according to claim 1, characterized in that: The three bevel gears (214) are meshed and connected, and the surfaces of the first connecting rod (211) and the second connecting rod (212) are both provided with one-way bearings (215).

4. The fixing bracket of the photovoltaic panel according to claim 1, characterized in that: A circular groove (110) is formed at the top of the base (100), and a sliding rod (224) slidably connected to the circular groove (110) is fixedly connected to the bottom end of the circular ring (220).

5. The fixing bracket of the photovoltaic panel according to claim 2, characterized in that: An air delivery pipe (252) is provided between the two first support rods (250), and the air delivery pipe (252) is connected to the cylinder body (221).

6. The fixing bracket of the photovoltaic panel according to claim 2, characterized in that: A third support rod (254) is hinged at the bottom end of the mounting frame (300), a third spring (253) is fixedly connected to the inner wall of the third support rod (254), and the other end of the third spring (253) is fixedly connected to the second support rod (251).

7. The fixing bracket of the photovoltaic panel according to claim 2, characterized in that: The limiting block (234) is in a U-shape, the inner wall of the limiting block (234) is in non-pressure contact with the limiting arc plate (233), a round rod is fixedly connected inside the limiting block (234), and the round rod is slidably connected to the limiting arc plate (233).

8. The fixing bracket of the photovoltaic panel according to claim 2, characterized in that: Two mounting grooves (2341) are provided in the limit block (234); a fourth spring (2342) is fixedly connected to the inner wall of the mounting groove (2341); a brake plate (2343) is fixedly connected to the other end of the fourth spring (2342); and an air bag (2344) connected to the first support rod (250) is provided between the mounting groove (2341) and the brake plate (2343).

9. The fixing bracket of the photovoltaic panel according to claim 8, characterized in that: The brake plate (2343) is a high-strength rubber component, and the brake plate (2343) extends out of the mounting groove (2341) and contacts the limiting arc plate (233).

10. The fixing bracket of the photovoltaic panel according to claim 1, characterized in that: A resistance-enhancing pad is provided at the bottom end of the locking plate (223), and evenly distributed grooves are formed at the bottom end of the resistance-enhancing pad.

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