Offshore Monitoring Station Applicable to Offshore Marine Fish Farms

Abstract

The present invention relates to the technical field of aquatic biological monitoring, and discloses an offshore monitoring station applicable to an offshore seawater fish farm, which includes a rotating and lifting monitoring mechanism for monitoring aquatic organisms, and further includes: a classified trapping mechanism for cooperating with the rotating and lifting monitoring mechanism to trap aquatic organisms; a traction mechanism for adjusting the position of the classified trapping mechanism, the traction mechanism includes a floating rail, and a sliding seat arranged on the outer surface of the floating rail, and the sliding seat is slidably arranged on the floating rail through rollers. By providing the rotating and lifting monitoring mechanism, the rotatable and liftable camera can be used to monitor the invasive aquatic organisms in the marine ranch in real time, so as to directly observe the condition of the aquatic organisms, and the monitoring range is large and the efficiency is high. In addition, with the cooperation of the provided classified trapping mechanism, trapping measures can be taken immediately when abnormal conditions are found.

Description

Technical Field

[0001] The present invention relates to the technical field of aquatic biological monitoring, and specifically to an offshore monitoring station applicable to offshore seawater fish farms. Background Art

[0002] As an efficient aquaculture method, marine ranching has developed rapidly in recent years. However, due to the uniqueness of the growth environment and management methods, marine ranches are prone to becoming potential places for the aggregation and spread of invasive aquatic organisms. These invasive species pose a serious threat to the ecosystem, leading to a decline in biodiversity, a reduction in fishery resources, and environmental deterioration. Therefore, effective means for monitoring invasive aquatic organisms are crucial for maintaining the ecological balance of marine ranches.

[0003] The patent application with the publication number CN118614466A discloses an offshore monitoring station applicable to offshore seawater fish farms, aiming to solve the problems of relatively single monitoring of the activity profiles of invasive aquatic organisms in marine ranches and poor planning for collecting genetic information of invasive aquatic organisms. This existing technology mainly reduces the possibility of omitting the types of invasive aquatic organisms monitored by setting up trapping plates, bottom plates, and spacing brackets, and improves the scope of monitoring the activity profiles of invasive aquatic organisms. However, this existing technology still has the following defects: it does not have the function of classifying and trapping invasive aquatic organisms, has a small monitoring range, low efficiency, and it is difficult to take immediate measures when abnormal situations are found. Summary of the Invention

[0004] The purpose of the present invention is to provide an offshore monitoring station applicable to offshore seawater fish farms to solve the problems of small monitoring range and low efficiency in monitoring invasive aquatic organisms in marine ranches by means of manual regular inspections as mentioned in the above background art.

[0005] To achieve the above purpose, the specific technical solution of the present invention is as follows: An offshore monitoring station applicable to offshore seawater fish farms includes a rotating and lifting monitoring mechanism for monitoring aquatic organisms, and further includes:

[0006] A classification trapping mechanism for cooperating with the rotating and lifting monitoring mechanism to trap aquatic organisms;

[0007] A traction mechanism for adjusting the position of the classification trapping mechanism. The traction mechanism includes a floating rail and a sliding seat arranged on the outer surface of the floating rail. The sliding seat is slidably arranged on the floating rail through rollers.

[0008] Preferably, both ends of the floating rail are fixedly provided with clamps, and a floating column is fixedly arranged inside the clamps. A counterweight block is fixedly arranged in the middle of the bottom end of the floating column. Trajectory grooves are respectively formed through both sides of the outer surface of the floating rail. A connecting frame is fixedly arranged in the middle of the lower surface of the sliding seat, and an alarm is installed in the middle of the upper surface of the sliding seat.

[0009] Preferably, bearing seats are fixedly arranged on both sides of the upper surface of the floating rail, a driving shaft is rotatably arranged inside the bearing seat through a bearing, and the two driving shafts are driven by a first belt transmission assembly. The outer end of one of the driving shafts is connected and assembled with the output end of an external driving member through a coupling. A driving plate is fixedly arranged inside the sliding seat at the position of the track groove, and the driving plate is connected with the toothed transmission belt constituting the first belt transmission assembly.

[0010] Preferably, the classification and trapping mechanism includes a movable frame arranged below the floating rail and corresponding to the sliding seat. The movable frame is designed in an inverted U-shaped structure. The movable frame is connected with a connecting frame. Chute grooves are formed through both sides of the movable frame, and a bidirectional screw rod is arranged inside the chute grooves. The bidirectional screw rod is rotatably arranged with the movable frame through a bearing. The two bidirectional screw rods are driven by a second belt transmission assembly. The classification and trapping mechanism further includes a second support plate fixedly arranged on the outer surface of the sliding seat. A driving rod is rotatably arranged inside the second support plate at the position of one of the bidirectional screw rods through a bearing, and the driving rod is connected with a synchronous pulley constituting the second belt transmission assembly. The outer end of the driving rod is connected and assembled with the output end of an external driving member through a coupling.

[0011] Preferably, a plurality of sliders are arranged on the outer surface of the bidirectional screw rod at equal intervals. The inner surfaces of the two sliders at the head and tail positions are both screwed with internal threads, and the two sliders at the head and tail positions are both engaged with the bidirectional screw rod through threads. The remaining sliders are all slidably arranged on the bidirectional screw rod. Scissor-type telescopic assemblies are arranged at both ends of the movable frame, and the cross central axis in the scissor-type telescopic assembly corresponds to the slider position and is connected with the slider.

[0012] Preferably, the classification and trapping mechanism further includes a plurality of partition plates arranged inside the movable frame at equal intervals. The partition plates correspond to the sliders and are connected with the sliders. A transparent telescopic cover is arranged between adjacent two partition plates, and both ends of the transparent telescopic cover are respectively connected with the adjacent two partition plates. A fish lamp holder is arranged in the middle of the transparent telescopic cover, and a fish attracting lamp is installed inside the fish lamp holder. Tensile springs are arranged at both ends of the fish lamp holder, and the fish lamp holder is elastically arranged with the partition plate through the tensile springs. A plurality of fish inlet openings are arranged on the inner wall of the transparent telescopic cover at equal intervals in a ring shape. A plurality of adapters are fixedly arranged on the outer surface of the fish inlet openings at equal intervals, and a transparent intercepting rod is rotatably arranged at the bottom of the adapter through a pin shaft.

[0013] Preferably, the rotary lifting monitoring mechanism includes a cylindrical frame disposed outside the movable frame, and a gear ring disposed on the outer surface of the cylindrical frame. The outer surface of the cylindrical frame is helically wound with an external thread, and the inner surface of the gear ring is helically wound with an internal thread. The gear ring and the cylindrical frame are arranged in threaded engagement. Both sides of the inner surface of the cylindrical frame are provided with connecting rods, and the cylindrical frame and the movable frame are connected by the connecting rods. The upper surface of the gear ring is fixedly provided with a mounting shell, and a camera is installed inside the mounting shell. The rotary lifting monitoring mechanism further includes a first support plate fixedly disposed on the outer surface of the sliding seat, and a flat key transmission shaft is rotatably disposed inside the first support plate through a bearing. A positioning gear is slidably disposed on the outer surface of the flat key transmission shaft at the position of the gear ring, and the positioning gear is in meshing transmission with the gear ring. The outer end of the flat key transmission shaft is connected and assembled with the output end of an external driving member through a coupling.

[0014] Preferably, the rotary lifting monitoring mechanism further includes a signal transmitting module for transmitting the image data collected by the camera, a data receiving module for receiving the image data from the signal transmitting module, and an image recognition module for processing and analyzing the received image data to identify the types and quantities of invasive aquatic organisms. It also includes a central processing unit and a triggering module. The triggering module is used to turn on each fishing light. The camera, signal transmitting module, data receiving module, image recognition module, central processing unit, triggering module, fishing light, and alarm are electrically connected.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] By setting the rotary lifting monitoring mechanism, the present invention can use the liftable and rotatable camera to monitor the invasive aquatic organisms in the marine ranch in real time, so as to directly observe the conditions of the aquatic organisms. Moreover, the monitoring range is large and the efficiency is high. In addition, with the configured classification trapping mechanism, it can immediately take trapping measures when an abnormal situation is detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 is a partial cross-sectional view of the floating rail structure of the present invention;

[0019] Figure 3 is a schematic diagram of the sliding seat structure of the present invention;

[0020] Figure 4 is a partial side cross-sectional view of the overall structure of the present invention;

[0021] Figure 5 is a partial side view of the overall structure of the present invention;

[0022] Figure 6Schematic cross-sectional structure diagram of the transparent telescopic cover of the present invention;

[0023] Figure 7 Schematic structure diagram of the fish inlet of the present invention.

[0024] In the figure: 100, traction mechanism; 101, floating rail; 102, sliding seat; 103, connecting frame; 104, driving plate; 105, alarm; 106, track groove; 107, first belt drive assembly; 108, drive shaft; 109, bearing seat; 110, floating column; 111, hoop; 112, counterweight; 113, roller; 200, rotary lifting monitoring mechanism; 201, cylindrical frame; 202, first support plate; 203, positioning gear; 204, flat key drive shaft; 205, gear ring; 206, mounting shell; 207, camera; 208, connecting rod; 300, classification and trapping mechanism; 301, movable frame; 302, second belt drive assembly; 303, second support plate; 304, drive rod; 305, chute; 306, bidirectional screw; 307, slider; 308, cross center shaft; 309, scissor-type telescopic assembly; 310, partition; 311, tension spring; 312, transparent telescopic cover; 313, fish attracting lamp; 314, fish lamp bracket; 315, fish inlet; 316, adapter; 317, pin shaft; 318, transparent interception rod. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figures 1-7 , the present invention provides a technical solution: an offshore monitoring station applicable to an offshore seawater fish farm, including a rotary lifting monitoring mechanism 200 for monitoring aquatic organisms. In this device, it further includes: a classification and trapping mechanism 300 for cooperating with the rotary lifting monitoring mechanism 200 to trap aquatic organisms; a traction mechanism 100 for adjusting the position of the classification and trapping mechanism 300.

[0027] Specifically, the traction mechanism 100 includes a floating rail 101 and a slide 102 arranged on the outer surface of the floating rail 101. The slide 102 and the floating rail 101 are slidably arranged through rollers 113. Both ends of the floating rail 101 are fixedly provided with a clamp 111, and a floating column 110 is fixedly provided inside the clamp 111 to drive the floating rail 101 to float on the sea surface. A counterweight block 112 is fixedly provided in the middle of the bottom end of the floating column 110 to stabilize the floating column 110 and prevent the floating column 110 from tipping over. Track grooves 106 are provided on both sides of the outer surface of the floating rail 101. , used to cooperate with the roller 113 to correct the sliding track of the slide 102, the roller 113 rolls inside the track groove 106, bearing seats 109 are fixedly arranged on both sides of the upper surface of the floating rail 101, and a drive shaft 108 is rotatably arranged inside the bearing seat 109, and the two drive shafts 108 are driven by a first belt transmission assembly 107. It is worth noting that the first belt transmission assembly 107 is composed of two synchronous pulleys and a toothed transmission belt. The two synchronous pulleys are respectively connected to the two drive shafts 108, and the two synchronous pulleys are connected to the two drive shafts 108. The transmission is transmitted by a toothed belt, wherein the outer end of a driving shaft 108 is connected and assembled with the output end of an external driving member through a coupling, and the driving member is an electric motor. As a prior art, it is not described here in detail. A protective cover for protecting the driving member is fixedly provided in the middle of the upper surface of the bearing seat 109. The driving member is arranged in the protective cover. A driving plate 104 is fixedly provided inside the slide 102 and located at the position of the track groove 106, and is used to cooperate with the first belt transmission assembly 107 to drive the slide 102 to slide synchronously, and the driving plate 104 slides inside the track groove 106. By starting the output shaft of the driving member to rotate forward or reverse, the driving plate 104 can drive the slide 102 to slide left and right. The driving plate 104 is connected to the toothed transmission belt in the first belt transmission assembly 107. It is worth noting that there is only one driving plate 104, and the driving plate 104 is only connected and fixed to one side of the toothed transmission belt in the first belt transmission assembly 107. A connecting frame 103 is fixedly provided in the middle of the lower surface of the slide 102. The cross-section of the connecting frame 103 is an I-shaped structure design, and an alarm 105 is installed in the middle of the upper surface of the slide 102.

[0028] Specifically, the classification trapping mechanism 300 includes a movable frame 301 disposed below the floating rail 101 and corresponding to the position of the sliding seat 102. The movable frame 301 is designed in an inverted U-shaped structure. The movable frame 301 is connected to the connecting frame 103. Both sides of the movable frame 301 are provided with through chutes 305, and a bidirectional screw 306 is disposed inside the chute 305. The bidirectional screw 306 is rotatably disposed on the movable frame 301 through a bearing. The two bidirectional screws 306 are driven by a second belt transmission assembly 302. It should be noted that the second belt transmission assembly 302 is composed of two synchronous pulleys and a toothed transmission belt. The two synchronous pulleys are respectively connected to the two bidirectional screws 306, and the two synchronous pulleys are driven by the toothed transmission belt. Further, the classification trapping mechanism 300 further includes a second support plate 303 fixedly disposed on the outer surface of the sliding seat 102. A driving rod 304 is rotatably disposed inside the second support plate 303 and corresponding to one of the bidirectional screws 306 through a bearing. The driving rod 304 is connected to the synchronous pulley constituting the second belt transmission assembly 302. The outer end of the driving rod 304 is connected and assembled with the output end of an external driving member through a coupling. The driving member is a motor, which is not described in detail here as it is prior art. A protective cover for protecting the driving member is fixedly disposed on the upper surface of the second support plate 303. The driving member is disposed inside the protective cover. A plurality of sliders 307 are arranged on the outer surface of the bidirectional screw 306 at equal intervals. In a single bidirectional screw 306, the inner surfaces of the two sliders 307 at the head and tail positions are both screwed with internal threads, and the two sliders 307 at the head and tail positions are both engaged with the bidirectional screw 306 through threads. The remaining sliders 307 are all slidably disposed on the bidirectional screw 306. When the bidirectional screw 306 rotates forward or backward, the two sliders 307 at the head and tail positions approach or move away synchronously. Both ends of the movable frame 301 are provided with scissor-type telescopic assemblies 309 for driving each slider 307 to move synchronously. The cross central axis 308 disposed in the scissor-type telescopic assembly 309 corresponds to the position of the slider 307, and the cross central axis 308 is connected to the slider 307. Further, the classification trapping mechanism 300 further includes a plurality of partitions 310 arranged at equal intervals inside the movable frame 301. The partitions 310 correspond to the position of the sliders 307, and the partitions 310 are connected to the sliders 307. A transparent telescopic cover 312 is disposed between two adjacent partitions 310. Both ends of the transparent telescopic cover 312 are respectively connected to two adjacent partitions 310. The transparent telescopic cover 312 can be telescopically folded. A fish lamp holder 314 is disposed in the middle of the transparent telescopic cover 312, and a fishing lamp 313 is installed inside the fish lamp holder 314. Each fishing lamp 313 has different functions and can attract different types of aquatic organisms. Tensile springs 311 are disposed at both ends of the fish lamp holder 314, and the fish lamp holder 314 is elastically disposed with the partition 310 through the tensile springs 311.The inner wall of the transparent telescopic cover 312 is provided with a plurality of fish inlet ports 315 arranged in an annular and equidistant manner, and the outer surface of the fish inlet ports 315 is fixedly provided with a plurality of adapter joints 316 arranged in an equidistant manner. And the bottom of the adapter joint 316 is rotatably provided with a transparent interception rod 318 through a pin shaft 317 for unidirectionally intercepting aquatic organisms. The fish inlet ports 315 are designed in a square structure.

[0029] Specifically, the rotary lifting monitoring mechanism 200 includes a cylindrical frame 201 arranged outside the movable frame 301, and a gear ring 205 arranged on the outer surface of the cylindrical frame 201. The outer surface of the cylindrical frame 201 is helically threaded, and the inner surface of the gear ring 205 is helically threaded. The gear ring 205 and the cylindrical frame 201 are arranged in threaded engagement. Both sides of the inner surface of the cylindrical frame 201 are provided with connecting rods 208, and the cylindrical frame 201 and the movable frame 301 are connected through the connecting rods 208. The upper surface of the gear ring 205 is fixedly provided with a mounting shell 206, and a camera 207 is installed inside the mounting shell 206. The camera 207 has a waterproof function and can clearly image under low light conditions for capturing underwater biological images. Further, the rotary lifting monitoring mechanism 200 further includes a first support plate 202 fixedly arranged on the outer surface of the slide base 102. And a flat key transmission shaft 204 is rotatably arranged inside the first support plate 202 through a bearing. A positioning gear 203 is slidably arranged on the outer surface of the flat key transmission shaft 204 at the position of the gear ring 205, and the positioning gear 203 is in meshing transmission with the gear ring 205. The outer end of the flat key transmission shaft 204 is connected and assembled with the output end of an external driving member through a coupling. The driving member is a motor, which is prior art and will not be elaborated here. The upper surface of the first support plate 202 is fixedly provided with a protective cover for protecting the driving member. The driving member is arranged inside the protective cover. Further, the rotary lifting monitoring mechanism 200 further includes a signal transmitting module for transmitting the image data collected by the camera 207, a data receiving module for receiving the image data from the signal transmitting module, and an image recognition module for processing and analyzing the received image data to identify the types and quantities of invading aquatic organisms. It also includes a central processing unit and a triggering module. The triggering module is used to turn on each fishing lamp 313. The camera 207, the signal transmitting module, the data receiving module, the image recognition module, the central processing unit, the triggering module, the fishing lamp 313, and the alarm 105 are electrically connected.

[0030] According to the above, by setting the rotary lifting monitoring mechanism 200, the rotatable and liftable camera 207 can be used to monitor the invading aquatic organisms in the marine ranch in real time, so as to directly observe the conditions of the aquatic organisms, with a large monitoring range and high efficiency. And in cooperation with the set classification trapping mechanism 300, trapping measures can be immediately taken when abnormal situations are found.

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

Claims

1. An offshore monitoring station applicable to an offshore seawater fish farm, including a rotary lifting monitoring mechanism (200) for monitoring aquatic organisms, characterized in that, Further comprising: A classification trapping mechanism (300) for cooperating with the provided rotary lifting monitoring mechanism (200) to trap aquatic organisms; A traction mechanism (100) for adjusting the position of the classification trapping mechanism (300), the traction mechanism (100) includes a floating rail (101), and a sliding seat (102) provided on the outer surface of the floating rail (101), and the sliding seat (102) is slidably arranged with the floating rail (101) through a roller (113); On both sides of the upper surface of the floating rail (101), bearing seats (109) are fixedly arranged, and a driving shaft (108) is rotatably arranged inside the bearing seat (109) through a bearing. And the two driving shafts (108) are driven by a first belt transmission assembly (107). The outer end of one of the driving shafts (108) is connected and assembled with the output end of an external driving member through a coupling. Inside the sliding seat (102) and at the position of the track groove (106), a driving plate (104) is fixedly arranged. The driving plate (104) is connected with the toothed transmission belt that constitutes the first belt transmission assembly (107). The classification and trapping mechanism (300) includes a movable frame (301) arranged below the floating rail (101) and corresponding to the position of the sliding seat (102). The movable frame (301) is designed in an inverted U-shaped structure. The movable frame (301) is connected with the connecting frame (103). On both sides of the movable frame (301), sliding grooves (305) are penetrated. And a bidirectional screw rod (306) is arranged inside the sliding groove (305). And the bidirectional screw rod (306) is rotatably arranged with the movable frame (301) through a bearing. The two bidirectional screw rods (306) are driven by a second belt transmission assembly (302). The classification and trapping mechanism (300) further includes a second support plate (303) fixedly arranged on the outer surface of the sliding seat (102). Inside the second support plate (303) and at the position of one of the bidirectional screw rods (306), a driving rod (304) is rotatably arranged through a bearing. And the driving rod (304) is connected with the synchronous pulley that constitutes the second belt transmission assembly (302). The outer end of the driving rod (304) is connected and assembled with the output end of an external driving member through a coupling. On the outer surface of the bidirectional screw rod (306), a plurality of sliders (307) are arranged at equal intervals. And the inner surfaces of the two sliders (307) at the head and tail positions are both screwed with internal threads. And the two sliders (307) at the head and tail positions are both engaged with the bidirectional screw rod (306) through threads. The remaining sliders (307) are all slidably arranged with the bidirectional screw rod (306). At both ends of the movable frame (301), scissor-type telescopic assemblies (309) are arranged. And the cross central axis (308) in the scissor-type telescopic assembly (309) corresponds to the position of the slider (307). And the cross central axis (308) is connected with the slider (307). The classification and trapping mechanism (300) further includes a plurality of partition plates (310) arranged inside the movable frame (301) and at equal intervals. The partition plates (310) correspond to the position of the sliders (307). And the partition plates (310) are connected with the sliders (307). A transparent telescopic cover (312) is arranged between two adjacent partition plates (310). And the two ends of the transparent telescopic cover (312) are respectively connected with two adjacent partition plates (310). In the middle of the transparent telescopic cover (312), a fish lamp holder (314) is arranged. And a fish attracting lamp (313) is installed inside the fish lamp holder (314).Both ends of the fish lamp holder (314) are provided with tension springs (311), and the fish lamp holder (314) and the partition board (310) are elastically arranged through the tension springs (311). A plurality of fish inlet openings (315) are arranged on the inner wall of the transparent telescopic cover (312) in an annular and equally spaced manner. A plurality of adapter joints (316) are fixedly arranged on the outer surface of the fish inlet openings (315) at equal intervals. And a transparent interception rod (318) is rotatably arranged at the bottom of the adapter joint (316) through a pin shaft (317). The rotary lifting monitoring mechanism (200) includes a cylindrical frame (201) arranged outside the movable frame (301), and a toothed ring (205) arranged on the outer surface of the cylindrical frame (201). The outer surface of the cylindrical frame (201) is helically threaded, and the inner surface of the toothed ring (205) is helically threaded. The toothed ring (205) and the cylindrical frame (201) are arranged through screw engagement. Both sides of the inner surface of the cylindrical frame (201) are provided with connecting rods (208), and the cylindrical frame (201) and the movable frame (301) are connected through the connecting rods (208). The upper surface of the toothed ring (205) is fixedly provided with a mounting shell (206), and a camera (207) is installed inside the mounting shell (206). The rotary lifting monitoring mechanism (200) further includes a first support plate (202) fixedly arranged on the outer surface of the slide base (102). A flat key transmission shaft (204) is rotatably arranged inside the first support plate (202) through a bearing. A positioning gear (203) is slidably arranged on the outer surface of the flat key transmission shaft (204) at the position of the toothed ring (205), and the positioning gear (203) is in meshing transmission with the toothed ring (205). The outer end of the flat key transmission shaft (204) is connected and assembled with the output end of an external driving member through a coupling. The rotary lifting monitoring mechanism (200) further includes a signal transmitting module for transmitting the image data collected by the camera (207), a data receiving module for receiving the image data from the signal transmitting module, and an image recognition module for processing and analyzing the received image data to identify the types and quantities of invading aquatic organisms. It also includes a central processor and a triggering module. The triggering module is used to turn on each fishing lamp (313). The camera (207), the signal transmitting module, the data receiving module, the image recognition module, the central processor, the triggering module, the fishing lamp (313), and the alarm (105) are electrically connected.

2. The offshore monitoring station applicable to an offshore seawater fish farm according to claim 1, characterized in that: Both ends of the floating rail (101) are fixedly provided with clamps (111), and a floating column (110) is fixedly arranged inside the clamp (111), and a counterweight (112) is fixedly arranged in the middle of the bottom end of the floating column (110). Trajectory grooves (106) are respectively formed through both sides of the outer surface of the floating rail (101), a connecting frame (103) is fixedly arranged in the middle of the lower surface of the sliding seat (102), and an alarm (105) is installed in the middle of the upper surface of the sliding seat (102).

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