A Hidden Fixing Device for the Buoyancy Material of an Underwater Robot

Abstract

The present invention relates to a concealed fixing device for a buoyancy material of an underwater robot. The blocking rod includes a dial rod section and a pressing rod section. The dial rod section extends to the outside of the housing. The connection between the dial rod section and the pressing rod section is rotatably arranged in the housing and is provided with a hanging groove. A blocking rod dial is arranged on the pressing rod section and abuts against the inner side surface of the upper end of the housing. The free end of the pressing rod section is provided with a cam hook portion. The cam is rotatably arranged in the housing, and a limiting protrusion portion cooperating with the cam hook portion is arranged on the upper side of the cam. A hanging protrusion portion for hanging with a fixing ring is arranged on the lower side of the cam. A side arc surface is arranged between the limiting protrusion portion and the hanging protrusion portion. The lower end of the hanging rod is rotatably arranged in the housing, and a hanging rod hook portion cooperating with the hanging groove is arranged at the upper end. A hanging rod protrusion is arranged in the middle of the hanging rod. A hanging rod pressing surface is formed on the side of the hanging rod away from the cam and abuts against a hanging rod dial arranged on the inner side of the side plate of the housing. The present invention facilitates the disassembly and assembly of the buoyancy block and the frame, and can be hidden in the gap at the corner end of the buoyancy block without affecting the outer surface of the buoyancy block.

Description

Technical Field

[0001] The present invention relates to the field of underwater robots, and more particularly to a concealed fixing device for buoyancy materials of an underwater robot. Background Art

[0002] As humans pay more and more attention to the development and utilization of marine resources, various underwater robots have been researched and manufactured. An important link in the design of underwater robots is the difference between the gravity of the robot itself and the buoyancy in water. Since the main body of an underwater robot is often made of metals such as aluminum alloy and titanium alloy, its weight is greater than the buoyancy, and buoyancy materials are needed for trimming. Also, because the material processing performance of the buoyancy materials themselves is better than that of metals, it is also necessary to use the streamlined design of the buoyancy materials to ensure the hydrodynamic characteristics of the shape of the underwater robot. However, in the prior art, the external buoyancy material blocks are usually fixed to the robot frame by bolts, which requires machining a plurality of holes on the outer surface of the external buoyancy blocks. This not only has a certain impact on the hydrodynamic characteristics of the entire robot, but also affects the aesthetics of the entire underwater robot. Summary of the Invention

[0003] The purpose of the present invention is to provide a concealed fixing device for buoyancy materials of an underwater robot, which can conveniently realize the installation and disassembly of the buoyancy blocks and the frame, and has a compact structure and small occupied space. It can be hidden in the corner gap of the buoyancy block and will not affect the outer surface of the buoyancy block.

[0004] The purpose of the present invention is achieved by the following technical solutions:

[0005] A concealed fixing device for buoyancy materials of an underwater robot includes a fixing ring, a housing, and a blocking rod, a cam, a hanging rod, and a return spring provided in the housing. The blocking rod includes a dial rod section and a pressing rod section. The dial rod section extends out of the housing. The connection between the dial rod section and the pressing rod section is rotatably provided in the housing and is provided with a hanging groove. A blocking rod dial is provided on the pressing rod section and abuts against the inner side surface of the upper end of the housing. The free end of the pressing rod section is provided with a cam hook portion. The cam is rotatably provided in the housing, and a limiting protrusion portion cooperating with the cam hook portion is provided on the upper side of the cam. A hanging protrusion portion for hanging with the fixing ring is provided on the lower side of the cam. A side arc surface is provided between the limiting protrusion portion and the hanging protrusion portion. The lower end of the hanging rod is rotatably provided in the housing. A hanging rod hook portion cooperating with the hanging groove is provided on the upper end of the hanging rod. A hanging rod protrusion portion facing the cam is provided in the middle of the hanging rod. A hanging rod pressing surface is formed on the side of the hanging rod away from the cam and abuts against a hanging rod dial provided on the inner side of the side plate of the housing.

[0006] Inside the housing, there are a cam rotating shaft, a blocking rod rotating shaft, and a hanging rod shaft hole. A camshaft hole is provided on the cam and sleeved on the cam rotating shaft. A blocking rod shaft hole is provided at the connection between the lever segment and the pressing rod segment of the blocking rod and sleeved on the blocking rod rotating shaft. The lower end of the hanging rod is provided with a hanging rod rotating shaft installed in the hanging rod shaft hole.

[0007] At the upper end of the housing, there is a blocking rod through hole for the lever segment to pass through. At the lower part of one side of the housing close to the fixing ring, there is an opening for the fixing ring to be inserted. A cover plate is provided on the housing.

[0008] On the lower side of the cam, there is a fixing ring abutting surface, and a fixing ring groove is formed between the fixing ring abutting surface and the hanging connection protrusion. The fixing ring contacts the fixing ring abutting surface and slides in and out of the fixing ring groove along the fixing ring abutting surface.

[0009] On one side of the cam, there is a first spring mounting hole. At the upper end of one side of the housing, there is a second spring mounting hole. The lower end of the return spring is mounted on the first spring mounting hole, and the upper end is mounted on the second spring mounting hole.

[0010] The blocking rod flap is bent in a U shape, and one side of the blocking rod flap is fixed to the pressing rod segment of the blocking rod, and the other side is provided with a first abutting plate that abuts against the inner side surface of the upper end of the housing.

[0011] The hanging rod flap is bent in a U shape, and one side of the hanging rod flap is fixed to the inner side of the side plate of the housing, and the other side is provided with a second abutting plate that abuts against the hanging rod pressing surface.

[0012] One side of the housing is provided with a fixing plate, and one side of the fixing ring is provided with a mounting plate.

[0013] When locked, the cam is driven to rotate through the fixing ring, and after rotating in place, the hanging connection protrusion is hooked to the fixing ring. At the same time, the pressing rod segment of the blocking rod is driven to rotate through the blocking rod flap. After rotating in place, the cam hook part is hooked to the limit protrusion part to lock the cam.

[0014] When unlocking, the blocking rod rotates first so that the hanging connection groove is hooked to the hanging rod hook part, and at the same time, the cam hook part is disengaged from the limit protrusion part. Then the fixing ring moves to drive the cam to rotate. The side arc surface of the cam first presses the hanging rod protrusion part, and then presses the hanging rod to rotate so that the hanging rod hook part is disengaged from the hanging connection groove on the blocking rod. At this time, the cam hook part of the blocking rod abuts against the side arc surface of the cam. Then the cam continues to rotate until the hanging connection protrusion is disengaged from the fixing ring. After disengagement, the cam continues to rotate to the limit position under the drive of the return spring.

[0015] The advantages and positive effects of the present invention are:

[0016] 1. The shell and the fixing ring of the present invention are fixed on the buoyancy block and the frame respectively, and the fixing ring is used to cooperate with the cam hook in the shell to realize the connection between the buoyancy block and the frame. At the same time, the blocking rod, hanging rod and other structures in the shell are used to realize locking when the buoyancy block and the frame are connected and unlocking when the buoyancy block and the frame are disassembled. The structure is simple and the connection is reliable.

[0017] 2. The present invention realizes locking and unlocking of the connection between the buoyancy block and the frame by moving the lever section of the resistance lever in coordination with the movement of the buoyancy block, which is simple and convenient to operate.

[0018] 3. The present invention has a compact structure and occupies little space. It can be hidden in the gap at the corner of the buoyancy block without affecting the outer surface of the buoyancy block, effectively ensuring the hydrodynamic characteristics of the robot, and making the underwater robot more beautiful in appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall schematic diagram of the present invention,

[0020] Figure 2 for Figure 1 The structural diagram of the present invention after removing the shell cover,

[0021] Figure 3 for Figure 2 The locking state diagram of the present invention is shown in FIG.

[0022] Figure 4 for Figure 2 The unlocking process state diagram of the present invention is as follows:

[0023] Figure 5 for Figure 2 The schematic diagram of the unlocked state of the present invention is shown in FIG.

[0024] Figure 6 This is a schematic diagram of the use state of the present invention.

[0025] Figure 7 for Figure 6 The enlarged view of point A in the figure,

[0026] Figure 8 for Figure 2 The cam structure diagram in

[0027] Figure 9 for Figure 2 Schematic diagram of the shell structure,

[0028] Figure 10 for Figure 2 Schematic diagram of the resistance rod structure,

[0029] Figure 11 for Figure 2 Schematic diagram of the hanging rod structure,

[0030] Figure 12 is Figure 2 a schematic diagram of the blocking rod paddle structure in

[0031] Figure 13 is Figure 2 a schematic diagram of the hanging rod paddle structure in

[0032] Among them, 1 is a fixed ring, 101 is a mounting plate, 2 is a housing, 201 is a fixing plate, 202 is a cover plate, 203 is an opening, 204 is a blocking rod through hole, 205 is a cam rotating shaft, 206 is a blocking rod rotating shaft, 207 is a hanging rod shaft hole, 208 is a second spring mounting hole, 3 is a blocking rod, 301 is a lever section, 302 is a pressing rod section, 303 is a hanging groove, 304 is a cam hook part, 305 is a blocking rod shaft hole, 4 is a blocking rod paddle, 401 is a first abutting plate, 402 is a first mounting hole, 5 is a cam, 501 is a limiting convex part, 502 is a hanging convex part, 5021 is an inclined surface, 503 is a fixed ring abutting surface, 504 is a first spring mounting hole, 505 is a cam shaft hole, 506 is a side arc surface, 6 is a hanging rod, 601 is a hanging rod hook part, 602 is a hanging rod convex part, 603 is an inner side surface of the hanging rod, 604 is a hanging rod pressing surface, 605 is a hanging rod rotating shaft, 7 is a hanging rod paddle, 701 is a second abutting plate, 702 is a second mounting hole, 8 is a return spring. Detailed implementation manners

[0033] The present invention will be further described in detail below with reference to the accompanying drawings.

[0034] As Figures 1 to 13 shown, the present invention includes a fixed ring 1, a housing 2, and a blocking rod 3, a cam 5, a hanging rod 6, and a return spring 8 disposed in the housing 2. Among them, as Figure 3 and Figure 10 shown, the blocking rod 3 includes a lever section 301 and a pressing rod section 302. The lever section 301 extends to the outside of the housing 2. The connection part of the lever section 301 and the pressing rod section 302 is rotatably disposed in the housing 2, and a hanging groove 303 is provided at the connection part of the lever section 301 and the pressing rod section 302. A blocking rod paddle 4 abuts against the inner side surface of the upper end of the housing 2 on the upper surface of the pressing rod section 302. A cam hook part 304 is provided at the free end of the pressing rod section 302. The cam 5 is rotatably disposed in the housing 2. As Figure 3 and Figure 8 shown, a limiting convex part 501 cooperating with the cam hook part 304 is provided on the upper side of the cam 5, and a hanging convex part 502 for hanging with the fixed ring 1 is provided on the lower side of the cam 5. The lower end of the hanging rod 6 is rotatably disposed in the housing 2. As Figure 3 and Figure 11As shown, the upper end of the hanging rod 6 is provided with a hanging rod hook portion 601 that cooperates with the hanging groove 303, and the middle part of the hanging rod 6 is provided with a hanging rod protrusion 602 facing the side of the cam 5, and the hanging rod pressure surface 604 of the hanging rod 6 away from the side of the cam 5 is abutted against the hanging rod paddle 7 provided on the inner side of the side panel of the shell 2.

[0035] like Figure 9 As shown, the housing 2 is provided with a cam shaft 205, a blocking rod shaft 206 and a hanging rod shaft hole 207. Figure 8 As shown, the cam 5 is provided with a camshaft hole 505 which is sleeved on the cam shaft 205 to realize rotation. Figure 10 As shown, the connection between the lever section 301 and the pressure lever section 302 of the blocking rod 3 is provided with a blocking rod shaft hole 305 which is sleeved on the blocking rod shaft 206 to realize rotation. Figure 11 As shown, the lower end of the hanging rod 6 is provided with a hanging rod shaft 605 which is installed in the hanging rod shaft hole 207 to realize rotation.

[0036] like Figures 2 to 5 as well as Figure 9 As shown, the upper end of the shell 2 is provided with a blocking rod through hole 204 for the lever section 301 of the blocking rod 3 to pass through, and the blocking rod through hole 204 has a sufficient width to meet the shifting requirements of the lever section 301, and the lower part of the side of the shell 2 close to the fixing ring 1 is provided with an opening 203 for the fixing ring 1 to be inserted, and the shell 2 is provided with a cover plate 202 to cover the internal structure.

[0037] like Figures 2 to 5 as well as Figure 8 As shown, an inclined fixing ring abutting surface 503 is provided on the lower side of the cam 5, and a fixing ring groove is formed between the fixing ring abutting surface 503 and the hanging protrusion 502. The fixing ring 1 contacts the fixing ring abutting surface 503 to push the cam 5 to rotate, and during the rotation of the cam 5, the fixing ring 1 slides along the fixing ring abutting surface 503 into or out of the fixing ring groove, thereby realizing the hanging locking and disengagement unlocking of the cam 5 and the fixing ring 1.

[0038] like Figure 8 As shown, a side arc surface 506 is provided between the limiting protrusion 501 and the hanging protrusion 502 of the cam 5. Figure 5As shown in the figure, when unlocking, the cam hook portion 304 of the blocking rod 3 and the rod protrusion portion 602 of the hanging rod 6 both abut against the side arc surface 506. As the cam 5 rotates counterclockwise, the side arc surface 506 can press the rod protrusion portion 602, thereby pressing the hanging rod 6 to rotate, and causing the rod hook portion 601 at the upper end of the hanging rod 6 to disengage from the hanging groove 303. When the cam 5 rotates to the limit position where the maximum opening is formed between the cam 5 and the side wall of the housing 2, the hanging rod dial 7 abuts against the hanging rod 6, and the rod protrusion portion 602 in the middle of the hanging rod 6 abuts against the side arc surface 506 near the hanging protrusion portion 502 to achieve position limitation. The radian of the side arc surface 506 can be designed according to actual needs.

[0039] As Figure 8 shown, a slope 5021 is provided at the lower end of the hanging protrusion portion 502 of the cam 5. As Figure 11 shown, an inner side surface 603 of the hanging rod is formed on the side of the lower part of the hanging rod 6 away from the pressing surface 604 of the pressing rod. As Figure 5 shown, after unlocking, the slope 5021 rotates to the side of the inner side surface 603 of the hanging rod to avoid interference, and at the same time, it can also assist in limiting the position of the cam 5.

[0040] As Figure 8 shown, a first spring mounting hole 504 is provided on one side of the cam 5. As Figure 9 shown, a second spring mounting hole 208 is provided at the upper end of one side of the housing 2. As Figures 2 to 5 , the lower end of the return spring 8 is installed on the first spring mounting hole 504 on the cam 5 through a screw, and the upper end of the return spring 8 is installed on the second spring mounting hole 208 on the housing 2 through a screw.

[0041] As Figure 12 shown, the blocking rod dial 4 is bent in a U shape, and a first mounting hole 402 is provided on one side of the blocking rod dial 4 for cooperating with a screw to be fixed to the pressing rod section 302 of the blocking rod 3. A first abutting plate 401 is provided on the other side of the blocking rod dial 4 to abut against the inner side surface of the upper end of the housing 2 to compress the blocking rod dial 4.

[0042] As Figure 13 shown, the hanging rod dial 7 is bent in a U shape, and a second mounting hole 702 is provided on one side of the hanging rod dial 7 for cooperating with a screw to be fixed to the inner side of the side plate of the housing 2. A second abutting plate 701 is provided on the other side of the hanging rod dial 7 to abut against the pressing surface 604 on the rear side of the hanging rod 6 to compress the hanging rod dial 7.

[0043] As Figure 1As shown, one side of the housing 2 is provided with a fixing plate 201 which is connected to a corresponding device (buoyancy block or frame), and one side of the fixing ring 1 is provided with a mounting plate 101 which is connected to a corresponding device (frame or buoyancy block).

[0044] The working principle of the present invention is as follows:

[0045] When the present invention works, the housing 2 and the fixing ring 1 are respectively fixed on the buoyancy block and the frame. Among them, as Figures 7 to 8 shown, the present invention takes the housing 2 being installed on the buoyancy block and the fixing ring 1 being installed on the frame as an example for illustration. When installing the buoyancy block, first, the lever section 301 of the blocking lever 3 is toggled to ensure that, as Figure 5 shown, the cam 5 forms the largest opening with the side plate of the housing 2 under the action of the return spring 8. At this time, the present invention is in a fully unlocked state. Then, as Figure 7 shown, the buoyancy material is pressed towards the frame direction. During the pressing process, the fixing ring 1 fixed on the frame contacts the fixing ring abutting surface 503 on the cam 5 and pushes the cam 5 to rotate. And during the rotation process, as Figure 3 shown, the fixing ring 1 slides into the fixing ring groove between the fixing ring abutting surface 503 and the hanging protrusion 502 along the fixing ring abutting surface 503, so as to realize the hanging connection between the hanging protrusion 502 and the fixing ring 1. At the same time, as Figure 7 shown, the present invention is provided on both sides of the buoyancy block, and the cams 5 in the housings 2 on both sides respectively act on the fixing rings 1 on the corresponding sides of the frame to hang and hold them, so as to realize the fixed connection between the buoyancy block and the frame. At this time, as Figure 3 shown, the pressing lever section 302 of the blocking lever 3 rotates under the action of the blocking lever piece 4, so that the cam hook part 304 at the end is hung on the limit protrusion 501 on the cam 5 to realize locking. The blocking lever piece 4 is always in a compressed state, which can ensure that the blocking lever 3 and the cam 5 make the cam 5 always tightly hang and wrap the fixing ring 1 without external force.

[0046] When disassembling the buoyancy block, as Figure 7 shown, a tool is used to reach into the gap at the corner end of the buoyancy block and press the blocking lever 3. At this time, as Figure 4As shown, the blocking rod 3 rotates to enable the hanging groove 303 to be hung and fixed with the hanging rod hook part 601 on the upper part of the hanging rod 6, and the hanging rod flap 7 is always in a compressed state, which can ensure that the hanging rod 6 locks the blocking rod 3 without external force. At the same time, the cam hook part 304 of the blocking rod 3 is disengaged from the limit protrusion part 501 on the cam 5, so that the blocking rod 3 no longer locks the cam 5. Then, the operator moves the buoyancy block away from the frame side to take out the buoyancy block. At this time, the fixing ring 1 drives the cam 5 to rotate counterclockwise through the hanging protrusion part 502. The side arc surface 506 of the cam 5 first contacts the hanging rod protrusion part 602 on the hanging rod 6, and then the fixing ring 1 continues to drive the cam 5 to rotate. As the cam 5 rotates, the side arc surface 506 of the cam 5 presses the hanging rod protrusion part 602, and further presses the hanging rod 6 to rotate clockwise so that the hanging rod hook part 601 is disengaged from the hanging groove 303 on the blocking rod 3. However, at the same time, since the cam 5 rotates through a certain angle, the cam hook part 304 of the blocking rod 3 can no longer be tightly locked with the limit protrusion part 501 of the cam 5, and it can only abut against the side arc surface 506 of the cam 5. Then the cam 5 continues to rotate until the hanging protrusion part 502 is disengaged from the fixing ring 1, as Figure 5 shown. After the cam 5 is disengaged from the fixing ring 1, it continues to rotate under the action of the return spring 8 to the limit position where the maximum opening is formed between the cam 5 and the side plate of the housing 2. At this time, the present invention is in a fully unlocked state, and the buoyancy block is disassembled from the frame body.

Claims

1. A concealed fixing device for a buoyancy material of an underwater robot, characterized in that: It includes a fixed ring (1), a housing (2), and a blocking rod (3), a cam (5), a hanging rod (6), and a return spring (8) disposed inside the housing (2). The blocking rod (3) includes a lever segment (301) and a pressing rod segment (302). The lever segment (301) extends outside the housing (2). The connection between the lever segment (301) and the pressing rod segment (302) is rotatably disposed in the housing (2) and is provided with a hanging groove (303). A blocking rod flap (4) is provided on the pressing rod segment (302) and abuts against the inner side surface of the upper end of the housing (2). A cam hook portion (304) is provided at the free end of the pressing rod segment (302). The cam (5) is rotatably disposed inside the housing (2), and a limiting protrusion portion (501) that cooperates with the cam hook portion (304) is provided on the upper side of the cam (5). A hanging protrusion portion (502) that is hooked to the fixed ring (1) is provided on the lower side of the cam (5). A side arc surface (506) is provided between the limiting protrusion portion (501) and the hanging protrusion portion (502). The lower end of the hanging rod (6) is rotatably disposed in the housing (2). A hanging rod hook portion (601) that cooperates with the hanging groove (303) is provided at the upper end of the hanging rod (6). A hanging rod protrusion portion (602) facing the cam (5) is provided in the middle of the hanging rod (6). A hanging rod pressing surface (604) is formed on the side of the hanging rod (6) away from the cam (5) and abuts against a hanging rod flap (7) disposed on the inner side of the side plate of the housing (2). The housing (2) and the fixed ring (1) are respectively fixed to the buoyancy block and the frame. When locked, the cam (5) is driven to rotate through the fixed ring (1). After rotating in place, the hanging protrusion portion (502) is hooked to the fixed ring (1). At the same time, the pressing rod segment (302) of the blocking rod (3) is driven to rotate through the blocking rod flap (4). After rotating in place, the cam hook portion (304) is hooked to the limiting protrusion portion (501) to lock the cam (5). When unlocking, the blocking rod (3) rotates first to hook the hanging groove (303) to the hanging rod hook portion (601), and at the same time, the cam hook portion (304) is disengaged from the limiting protrusion portion (501). Then, the movement of the fixed ring (1) drives the cam (5) to rotate. The side arc surface (506) of the cam (5) first presses the hanging rod protrusion portion (602), and further presses the hanging rod (6) to rotate so that the hanging rod hook portion (601) is disengaged from the hanging groove (303) on the blocking rod (3). At this time, the cam hook portion (304) of the blocking rod (3) abuts against the side arc surface (506) of the cam (5). Then, the cam (5) continues to rotate until the hanging protrusion portion (502) is disengaged from the fixed ring (1). After disengagement, the cam (5) continues to rotate to the limit position under the drive of the return spring (8).

2. The concealed fixing device for the buoyancy material of the underwater robot according to claim 1, characterized in that: Inside the housing (2), there are a cam rotating shaft (205), a blocking rod rotating shaft (206) and a hanging rod shaft hole (207). A camshaft hole (505) is provided on the cam (5) and is sleeved on the cam rotating shaft (205). A blocking rod shaft hole (305) is provided at the connection of the lever section (301) and the pressing rod section (302) of the blocking rod (3) and is sleeved on the blocking rod rotating shaft (206). A hanging rod rotating shaft (605) is provided at the lower end of the hanging rod (6) and is installed in the hanging rod shaft hole (207).

3. The hidden fixing device for the buoyancy material of the underwater robot according to claim 1, wherein: At the upper end of the housing (2), there is a blocking rod through hole (204) for the lever section (301) to pass through. At the lower part of one side of the housing (2) close to the fixing ring (1), there is an opening (203) for the fixing ring (1) to be inserted into. A cover plate (202) is provided on the housing (2).

4. The hidden fixing device for the buoyancy material of the underwater robot according to claim 1, characterized in that: On the lower side of the cam (5), there is a fixing ring abutting surface (503), and a fixing ring groove is formed between the fixing ring abutting surface (503) and the hanging and connecting protrusion (502). The fixing ring (1) contacts the fixing ring abutting surface (503) and slides in and out of the fixing ring groove along the fixing ring abutting surface (503).

5. The hidden fixing device for the buoyancy material of the underwater robot according to claim 1, characterized in that: On one side of the cam (5), there is a first spring mounting hole (504). At the upper end of one side of the housing (2), there is a second spring mounting hole (208). The lower end of the return spring (8) is mounted on the first spring mounting hole (504), and the upper end is mounted on the second spring mounting hole (208).

6. The hidden fixing device for the buoyancy material of the underwater robot according to claim 1, characterized in that: The blocking rod dial (4) is bent in a U shape. One side of the blocking rod dial (4) is fixed to the pressing rod section (302) of the blocking rod (3), and the other side is provided with a first abutting plate (401) that abuts against the inner side surface of the upper end of the housing (2).

7. The concealed fixing device for the buoyancy material of an underwater robot according to claim 1, characterized in that: The hanging rod dial (7) is bent in a U shape. One side of the hanging rod dial (7) is fixed to the inner side of the side plate of the housing (2), and the other side is provided with a second abutting plate (701) that abuts against the hanging rod pressing surface (604).

8. The hidden fixing device for the buoyancy material of the underwater robot according to claim 1, wherein: On one side of the housing (2), there is a fixing plate (201). On one side of the fixing ring (1), there is a mounting plate (101).

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