Net stretching device facilitating inspection of fish upstream in vertical seam type fishway

Abstract

The utility model discloses a net stretching device convenient for checking the upstream of fish in a vertical seam type fishway, which comprises a support frame arranged in the vertical seam type fishway, a middle partition net is arranged in the support frame, a partition net channel is arranged on the surface of the middle partition net, a fish passing channel is arranged between the partition net channel and the end part of the support frame, and a fish passing channel is arranged on the support frame. The caliber of the fish passing channel is gradually reduced in the fish upstream direction; according to the fish catching device, migratory and upstream fishes in the vertical seam type fishway are caught to complete the collecting process, and the problem that fish catching in the vertical seam type fishway is inconvenient is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fishways, in particular to a net-setting device which is convenient for inspecting fish swimming upstream in vertical slit fishways. Background Art

[0002] The construction of hydraulic engineering projects has altered river ecosystems to some extent. Dam construction, in particular, has hindered river connectivity, significantly impacting the life cycle of migratory fish, including their upstream migration and reproduction. To mitigate these impacts, fishways are constructed based on the actual dam conditions to facilitate fish migration upstream. Currently, vertical slot fishways are the most widely used in China. To verify the effectiveness of vertical slot fishways in completing upstream migration during specific periods, it is necessary to record the number of fish migrating upstream. However, the relatively narrow space of vertical slot fishways precludes the use of cast nets for catching fish. Technicians are tasked with recording the number of fish migrating upstream, and conventional traps are unable to meet the current requirements. Furthermore, conventional PIT monitoring experiments require complex procedures, including coil fabrication, adjustment equipment, and solar power systems, making them inconvenient to operate. Summary of the Invention

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a net-setting device that is convenient for inspecting fish migrating upstream in a vertical slot fishway, so as to catch fish migrating upstream in the vertical slot fishway to complete the collection process and solve the problem of inconvenience in fishing in the vertical slot fishway.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a net-setting device for facilitating the inspection of fish swimming upstream in a vertical slot fishway, comprising a support frame arranged in the vertical slot fishway, a middle partition net being provided inside the support frame, a partition net channel being provided on the surface of the middle partition net, a fish passage being provided between the partition net channel and the end of the support frame, and the diameter of the fish passage gradually decreases along the direction of fish swimming upstream.

[0005] Preferably, an outlet baffle and an outlet guide plate are provided inside the vertical slot fishway, the outlet baffle and the outlet guide plate are staggered and have a gap therebetween, and a support frame is installed in the gap.

[0006] Preferably, the support frame is fixed to the gap between the outlet baffle and the outlet guide plate by means of U-shaped nails.

[0007] Preferably, the support frame includes six supporting steel mesh surfaces combined together to form a rectangular parallelepiped structure, and an entrance is provided on the supporting steel mesh surface at the entrance of the support frame.

[0008] Preferably, the supporting steel wire mesh surface at the top is detachably connected to other supporting steel wire mesh surfaces via cable ties.

[0009] Preferably, the fish passage comprises four fish-passing steel mesh surfaces combined together to form a quadrangular pyramid structure with a hollow interior.

[0010] Beneficial effects of the utility model:

[0011] 1. The fish passage of the net is set in the shape of a quadrangular pyramid, which has higher resistance to water impact and better stability in structure. The diameter of the fish passage gradually decreases along the upstream direction of the fish, so it is easy for fish to enter but difficult to escape, which improves the efficiency of fish collection.

[0012] 2. The fish inlet surface of the spread net near the vertical slot fishway outlet is set as a semi-open structure, which has the effect of blocking fish during the fish inlet process, and is more conducive to the fish guidance and collection process of the spread net.

[0013] 3. The net is placed away from the upper wire mesh surface of the vertical slit fishway exit and is fixed with detachable cable ties, which is more conducive to the staff to collect and record the fish caught by the net, realize the automatic collection of fish, improve work efficiency and save labor costs.

[0014] 4. The overall framework of the net is set as a non-scalable structure, which can withstand the erosion of different flow rates in the fishway to a great extent.

[0015] 5. The overall support frame of the net is a rigid structure, which enhances the stability of the device when collecting fish in a vertical slit manner.

[0016] 6. The six tensioning nets and the spacer nets are made of steel wire mesh, which enhances the stability of the tensioning net device during floods and ensures its reliability and firmness in the project.

[0017] 7. The utility model catches fish migrating upstream in the vertical slot fishway to complete the collection process, solving the problem of inconvenience in fishing in the vertical slot fishway. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a net-setting device that is convenient for inspecting fish swimming upstream in vertical slot fishways.

[0019] Figure 2 This is a schematic diagram of the structure connecting the middle partition net and the fish passage;

[0020] Figure 3 This is a structural diagram of the net-setting device of the utility model installed in a vertical slot fishway;

[0021] Figure 4 It is a structural diagram of a U-shaped nail. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1-2 As shown, a net-setting device for inspecting fish swimming upstream in a vertical slot fishway comprises a support frame 1 arranged in a vertical slot fishway 2, a middle partition net 3 is provided inside the support frame 1, a partition net channel 4 is provided on the surface of the middle partition net 3, a fish passage 5 is provided between the partition net channel 4 and the end of the support frame 1, and the diameter of the fish passage 5 gradually decreases along the fish swimming upstream direction.

[0024] Preferably, if Figure 3 As shown, the vertical slot fishway 2 is provided with an outlet baffle 2.1 and an outlet guide plate 2.2. The outlet baffle 2.1 and the outlet guide plate 2.2 are staggered and have a gap therebetween. A support frame 1 is installed in the gap. After the support frame 1 is installed in the gap, it is convenient for fish to quickly enter the entire net-setting device.

[0025] Preferably, if Figure 4 As shown, the support frame 1 is fixed to the gap between the outlet baffle 2.1 and the outlet guide plate 2.2 by U-shaped nails. The U-shaped nails can quickly realize the detachable installation process of the entire net stretching device.

[0026] Preferably, the support frame 1 comprises six supporting steel mesh surfaces 1.1 assembled together to form a rectangular parallelepiped structure, and the supporting steel mesh surface 1.1 at the inlet of the support frame 1 is provided with an inlet 1.2. The six netting surfaces and the separation netting surfaces are steel mesh surfaces, which enhances the stability of the netting device in floods and has a reliable and firm structure in engineering.

[0027] Preferably, the supporting wire mesh surface 1.1 at the top is detachably connected to the other supporting wire mesh surfaces 1.1 by cable ties. With this design, after the fish are collected in the net-stretching device, when it is necessary to take out the fish, the cable ties can be directly removed to take out the fish.

[0028] Preferably, the fish passage 5 comprises four fish wire mesh surfaces 5.1 assembled together to form a quadrangular pyramid structure with a hollow interior. The fish passage is arranged in a quadrangular pyramid shape, which has higher water impact resistance and better stability in structure.

[0029] The working principle of this utility model is as follows:

[0030] In specific use, the device is installed in the gap between the outlet baffle 2.1 and the outlet guide plate 2.2. Water flows along the vertical slot fishway 2 from upstream to downstream. Fish migrating upstream enter the vertical slot fishway 2 inlet and swim upstream to the outlet. They enter the four-sided prism fish passage 5 of the net, pass through the partition net passage 4, and then enter the fish collection area, completing the fish collection function of the vertical slot fishway within a specific time. Because the diameter of the fish passage 5 gradually decreases along the fish's upstream direction, fish can easily enter but cannot escape, thereby improving fish collection efficiency.

[0031] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A net-setting device for facilitating the inspection of fish upstream of a vertical slot fishway, comprising a support frame (1) disposed within the vertical slot fishway (2), characterized in that: A middle partition net (3) is provided inside the support frame (1), a partition net channel (4) is provided on the surface of the middle partition net (3), a fish passage (5) is provided between the partition net channel (4) and the end of the support frame (1), and the diameter of the fish passage (5) gradually decreases along the fish upstream direction.

2. A net-setting device for inspecting fish moving upstream in a vertical slot fishway according to claim 1, characterized in that: An outlet baffle (2.1) and an outlet guide plate (2.2) are provided inside the vertical slot fishway (2). The outlet baffle (2.1) and the outlet guide plate (2.2) are staggered and have a gap therebetween, and a support frame (1) is installed in the gap.

3. The net-setting device for facilitating the inspection of fish upstream in a vertical slot fishway according to claim 2, characterized in that: The support frame (1) is fixed to the gap between the outlet baffle (2.1) and the outlet guide plate (2.2) by means of U-shaped nails.

4. The net-setting device for facilitating inspection of fish upstream in a vertical slot fishway according to claim 1, characterized in that: The support frame (1) comprises six support steel mesh surfaces (1.1) combined together to form a rectangular parallelepiped structure, and the support steel mesh surface (1.1) located at the inlet of the support frame (1) is provided with an inlet (1.2).

5. The net-setting device for facilitating the inspection of fish upstream in a vertical slot fishway according to claim 1, characterized in that: The supporting steel wire mesh surface (1.1) at the top is detachably connected to other supporting steel wire mesh surfaces (1.1) via cable ties.

6. The net-setting device for facilitating inspection of fish upstream in a vertical slot fishway according to claim 1, characterized in that: The fish passage (5) comprises four fish-passing steel mesh surfaces (5.1) assembled together to form a quadrangular pyramid structure with a hollow interior.

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