Adjustable fish collecting device for fish passage entrance area

Abstract

The application belongs to the technical field of fish protection in hydraulic engineering, and discloses an adjustable fish collecting device for an entrance area of a fishway, which comprises a gate chamber. During the flow of water in the gate chamber, the square fan roller is reversely rotated, the rotating rod and the disc are driven to rotate during the rotation of the square fan roller, the disc drives the conveyor belt and the strip shell to rotate, the strip shell drives the sliding rod, the conical sleeve block and the water baffle to reversely rotate, the water baffle can hinder the flow direction of the water flow during the reverse rotation, and the flow rate of the water flow is slowed down. During the reverse movement of the conical sleeve block, the conical sleeve block drives the square net to move, and the square net can filter impurities in the water during the movement, so that the impurities in the water flow and the fish can not pass through the fishway into the downstream river channel together, the collision between the fish and the impurities is avoided, and the damage to the fish body is reduced. The fish school can smoothly pass through the fishway without external interference, so that the fish is prevented from being injured or dead.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fish protection in water conservancy projects, and specifically relates to an adjustable fish collecting device for an entrance area of a fishway. BACKGROUND

[0002] An adjustable fish collecting device for an entrance area of a fishway is a device used to guide fish into a fishway and help them pass through dams, rivers or other obstacles. The design of the fishway is usually to enable fish to pass through artificial or natural obstacles safely and smoothly, and the fish collecting device plays a role in guiding and collecting fish at the entrance of the fishway.

[0003] The prior art document with the file number CN119824861A discloses a safe and efficient fish downward device and a downward operation method. The device includes a downward tower, a downward fishway is arranged on the downward tower, and the upward and downward river channels are connected through a fish luring pool and a buffer fishway, respectively. A gate-controlled upstream scheduling area is arranged on the upstream to attract juvenile fish and send them into the downward fishway. The application sets a spiral downward fishway, greatly reduces the required land area of the fish downward channel, and is suitable for various intermountain high dam environments lacking construction of downward channels. At the same time, through the arrangement of the buffer pool and the buffer fishway, the impact on the fish during downward movement can be greatly reduced, and the survival rate of the fish is increased. After the juvenile fish are attracted into the fish luring pool by the fish luring mechanism, the juvenile fish can be quickly sent to the downstream river channel through the downward fishway by using the water head difference between the upstream and downstream as power. The downward efficiency is high while the maintenance cost is low, and the device is suitable for wide application and promotion.

[0004] Although the above-mentioned application can keep the maintenance cost low while the downward efficiency is high, in this process, the device relies on the water head difference as power to push the fish to work downward. Too large or too small water flow may cause the fish to fail to smoothly enter the downward channel, or may cause the water flow of the fishway to be unstable, thereby affecting the migration efficiency of the fish. SUMMARY

[0005] To solve the problem of unstable water flow flow rate in the background art, the application provides an adjustable fish collecting device for an entrance area of a fishway.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme: an adjustable fish collecting device for an entrance area of a fishway, including two gate chambers, one end of each gate chamber is fixedly connected with a fishway, the top of each gate chamber is fixedly connected with a connecting plate, one side of the connecting plate is fixedly connected with a fish luring lamp, and the adjustable fish collecting mechanism includes a buffer fishway box fixedly connected between the two gate chambers, the top of the buffer fishway box is arranged in an open manner, both sides of each gate chamber are communicated with square tubes, one side of the inner wall of each gate chamber is rotatably connected with three square fan rollers, and the inner wall of each square fan roller is provided with a speed reduction assembly for slowing down the flowing water.

[0007] Preferably, the speed reduction assembly comprises a rotating rod fixedly connected to the inner wall of the square fan roller, both ends of the rotating rod are rotatably connected with a disc, and the outer wall of the disc is rotatably connected with a conveying belt.

[0008] Preferably, the conveying belt is arranged in the buffer fish lane box, a plurality of strip shells are arranged around the outer wall of the conveying belt, and the inner walls of both ends of the strip shell are slidably connected with a sliding rod.

[0009] Preferably, an extrusion spring is fixedly connected between the two sliding rods, the extrusion spring is arranged in the strip shell, and the top end of the sliding rod is fixedly connected with a conical sleeve block.

[0010] Preferably, the conical sleeve block is fixedly connected with a water baffle on both ends of one side, and a square net is fixedly connected between adjacent two conical sleeve blocks.

[0011] Preferably, the outer wall of the rotating rod is provided with an auxiliary assembly, the auxiliary assembly comprises a reciprocating screw rod fixedly connected to the outer wall of the rotating rod close to both ends of the disc, and the outer wall of one end of the reciprocating screw rod is threadedly connected with a threaded plate.

[0012] Preferably, the top of the threaded plate is slidably connected to the inner wall of the buffer fish lane box, the bottom of the threaded plate is fixedly connected with a bent plate, and one end of the bent plate is fixedly connected with an extrusion plate.

[0013] Preferably, the outer wall of the extrusion plate is fixedly connected with a sealing sleeve, the inner wall of the buffer fish lane box is fixedly connected with a water storage shell, both sides of the water storage shell are arranged in an open manner, and the outer wall of the water storage shell is communicated with a connecting pipe.

[0014] Preferably, one end of the connecting pipe away from the water storage shell is communicated with a strip-shaped box, one side of the outer wall of the strip-shaped box is fixedly connected to one side of the outer wall of the buffer fish lane box, and a drainage opening is formed in the top of the strip-shaped box.

[0015] Preferably, the side wall of the threaded plate is provided with a cleaning assembly, the cleaning assembly comprises a fixed plate fixedly connected to one side of the threaded plate, and a plurality of conical blocks are fixedly connected to one side of the fixed plate.

[0016] Compared with the prior art, the beneficial effects of the present application are as follows:

[0017] The adjustable fish collecting mechanism is provided, the fish attracting lamp is started, the light emitted by the fish attracting lamp makes the fish in the upstream river gather in the buffer fish lane box, at this time, the fishway is inclined, the water in the upstream flows into the inside of the fishway along the top of the buffer fish lane box, the water carries the fish into the inside of the downstream along the fishway, in the process of water flow, the water flow enters the inside of the gate chamber through the square pipe, the water flow enters the inside of the fishway through the square pipe at the other end, in the process of water flow in the gate chamber, the square fan roller reversely rotates, the square fan roller drives the rotating rod and the disc to rotate in the process of rotation, the disc drives the conveying belt and the strip shell to rotate, the strip shell drives the sliding rod, the conical sleeve block and the water baffle to reversely rotate, the water baffle reversely rotates in the process, can hinder the flow direction of the water flow, delay the flow rate of the water flow, avoid that the too fast water flow causes damage or influence to the fish. When the conical sleeve block reversely moves, the conical sleeve block drives the square net to move, the square net moves in the process, can filter the impurities in the water, prevent the impurities in the water flow from passing through the fishway into the downstream river together with the fish, avoid the collision of the fish and the impurities, reduce the damage to the fish body. The fish school can smoothly pass through the fishway without external interference, so as to avoid the injury or death of the fish.

[0018] The adjustable fish collecting mechanism is provided, when the impurities are accumulated too much in the square net, the impelling force generated by the impurities and the water makes the square net deform, the square net drives the conical sleeve block and the sliding rod to slide in the inside of the strip shell, the two sliding rods approach each other, the sliding rod drives the conical sleeve block and the water baffle to approach each other, in the process that the plurality of water baffles approach each other, can gradually hinder the water flow at different positions, further balance the water flow speed, ensure that the water flow can still flow gently when the impurities accumulate, avoid any damage to the fish school or ecological environment. When the square net above the conveying belt moves to the lower side of the conveying belt, the impurities stuck in the mesh of the square net will automatically fall, which facilitates the subsequent square net to move to the upper side of the conveying belt to filter the impurities.

[0019] The adjustable fish collecting mechanism is provided, when the rotating rod rotates, the rotating rod drives the reciprocating screw rod to rotate, the two reciprocating screw rods drive the two threaded plates to move close to each other along the inner wall of the buffer fishway box, the threaded plates drive the bending plates and the extrusion plates to move close to each other, the extrusion plates drive the sealing sleeves to move close to each other, in the process that the extrusion plates and the sealing sleeves move close to each other, the extrusion plates can gradually slide in the inside of the water storage shell, the water flowing in the inside of the water storage shell is extruded, the water in the inside of the water storage shell enters the inside of the connecting pipe, the water flow enters the inside of the strip-shaped box through the connecting pipe, the water flow is discharged outward through the water discharge port arranged at the strip-shaped box, the fish gathered around the fish attracting lamp is discharged, the flow of the water flowing into the fishway is expanded, the expanded water flow can make the gathered fish enter the inside of the fishway faster, the speed of the fish group entering the fishway is improved, and the passing efficiency of the fishway is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the whole schematic view of the structure of the application;

[0021] Figure 2 It is the side structure schematic view of the fish attracting lamp of the application;

[0022] Figure 3 It is the Figure 2 enlarged view of A in the application;

[0023] Figure 4 It is the sectional structure schematic view of the gate chamber of the application;

[0024] Figure 5 It is the side structure schematic view of the conveying belt of the application;

[0025] Figure 6 It is the Figure 5 enlarged view of B in the application;

[0026] Figure 7 It is the front structure schematic view of the square net of the application;

[0027] Figure 8 It is the Figure 7 enlarged view of C in the application;

[0028] Figure 9 This is a schematic diagram of the cone-shaped block structure from below in this invention.

[0029] In the diagram: 1. Gate chamber; 2. Fishway; 3. Connecting plate; 4. Fish attractant light; 5. Adjustable fish collection mechanism; 51. Buffer fishway box; 52. Square tube; 53. Square fan roller; 54. Slowing component; 55. Auxiliary component; 56. Cleaning component; 541. Rotating rod; 542. Disc; 543. Conveyor belt; 544. Strip shell; 545. Sliding rod; 546. Compression spring; 547. Conical sleeve; 548. Water baffle; 549. Square net; 551. Reciprocating screw; 552. Threaded plate; 553. Bending plate; 554. Compression plate; 555. Sealing sleeve; 556. Water storage shell; 557. Connecting pipe; 558. Strip box; 559. Drainage outlet; 561. Fixing plate; 562. Conical block. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1 to 9 As shown, the present invention provides an adjustable fish collection device for the entrance area of ​​a fishway, including a gate chamber 1, two gate chambers 1 are provided, a fishway 2 is fixedly connected to one end of the gate chamber 1, a connecting plate 3 is fixedly connected to the top of the gate chamber 1, a fish attracting light 4 is fixedly connected to one side of the connecting plate 3, and also includes;

[0032] The adjustable fish collection mechanism 5 includes a buffer fish channel box 51 fixedly connected between two gate chambers 1. The top of the buffer fish channel box 51 is open. Square tubes 52 are connected to both sides of the gate chamber 1. Three square fan rollers 53 are rotatably connected to one side of the inner wall of the gate chamber 1. The inner wall of the square fan rollers 53 is provided with a slowing component 54 for slowing down the flowing water.

[0033] Using the above scheme: Activate the fish-attracting lamp 4. The light emitted by the fish-attracting lamp 4 causes the fish in the upstream river channel to gather at the buffer fish alley box 51. At this time, the inclined fishway 2 causes the water in the upstream channel to flow into the interior of the fishway 2 along the top of the buffer fish alley box 51. The water carries the fish into the downstream channel.

[0034] The slowing component 54 includes a rotating rod 541 fixedly connected to the inner wall of the square fan roller 53. Both ends of the rotating rod 541 are rotatably connected to a disc 542, and the outer wall of the disc 542 is rotatably connected to a conveyor belt 543.

[0035] The conveying belt 543 is arranged in the interior of the buffer fish lane box 51, and a plurality of strip shells 544 are arranged around the outer wall of the conveying belt 543, and the inner walls of the two ends of the strip shell 544 are slidably connected with sliding rods 545.

[0036] The two sliding rods 545 are fixedly connected with an extrusion spring 546, the extrusion spring 546 is arranged in the interior of the strip shell 544, and the top end of the outer wall of the sliding rod 545 is fixedly connected with a conical sleeve block 547.

[0037] The conical sleeve block 547 is fixedly connected with a water baffle 548 on one side of the two ends, and a square net 549 is fixedly connected between the adjacent two conical sleeve blocks 547.

[0038] By adopting the above scheme, the square fan roller 53 is reversely rotated in the process of the water flow flowing in the gate chamber 1, the square fan roller 53 drives the rotating rod 541 and the disc 542 to rotate in the process of rotating, the disc 542 drives the conveying belt 543 and the strip shell 544 to rotate, the strip shell 544 drives the sliding rod 545, the conical sleeve block 547 and the water baffle 548 to reversely rotate, and the water baffle 548 can hinder the flow direction of the water flow in the process of reversely rotating, and delay the flow rate of the water flow.

[0039] As shown in Figures 1 to 9 The outer wall of the rotating rod 541 is provided with an auxiliary assembly 55, the auxiliary assembly 55 includes a reciprocating screw rod 551 fixedly connected to the outer wall of the rotating rod 541 near the two ends of the disc 542, and a threaded plate 552 is threadedly connected to one end of the outer wall of the reciprocating screw rod 551.

[0040] The top of the threaded plate 552 is slidably connected to the inner wall of the buffer fish lane box 51, the bottom of the threaded plate 552 is fixedly connected with a bent plate 553, and one end of the bent plate 553 is fixedly connected with an extrusion plate 554.

[0041] The outer wall of the extrusion plate 554 is fixedly connected with a sealing sleeve 555, the inner wall of the buffer fish lane box 51 is fixedly connected with a water storage shell 556, the two sides of the water storage shell 556 are arranged in an open manner, and one side of the outer wall of the water storage shell 556 is communicated with a connecting pipe 557.

[0042] One end of the connecting pipe 557 away from the water storage shell 556 is communicated with a strip box 558, one side of the outer wall of the strip box 558 is fixedly connected to one side of the outer wall of the buffer fish lane box 51, and a drainage port 559 is formed in the top of the strip box 558.

[0043] Adopting the above scheme: when the rotating rod 541 rotates, the rotating rod 541 drives the reciprocating screw rod 551 to rotate, the two reciprocating screw rods 551 drive the two threaded plates 552 to move close to each other along the inner wall of the buffer fish channel box 51, the threaded plate 552 drives the bending plate 553 and the extrusion plate 554 to move close to each other, the extrusion plate 554 drives the sealing sleeve 555 to move close to each other, and when the extrusion plate 554 and the sealing sleeve 555 move close to each other, the sealing sleeve 555 can gradually slide in the inside of the water storage shell 556, and the water flowing in the inside of the water storage shell 556 is extruded, so that the water in the inside of the water storage shell 556 enters the inside of the connecting pipe 557, the water flows through the connecting pipe 557 and enters the inside of the strip-shaped box 558, and the water flows out through the water outlet 559 arranged at the strip-shaped box 558, so that the fish gathered around the fish lamp 4 is drained, and the flow rate of the water flowing into the fishway 2 is increased.

[0044] The side wall of the threaded plate 552 is provided with a cleaning assembly 56, and the cleaning assembly 56 comprises a fixed plate 561 fixedly connected to one side of the threaded plate 552.

[0045] Adopting the above scheme: in the process that the threaded plates 552 move close to each other, the threaded plates 552 push the fixed plate 561 and the conical blocks 562 to move close to each other. Through the plurality of uniformly spaced conical blocks 562, the conical blocks 562 are in contact with the outer wall of the conical sleeve block 547 rotating in the opposite direction, are subjected to the extrusion action of the inclined surface of the conical block 562, and are caused to drive the sliding rods 545 to move close to each other in the strip-shaped shell 544. At the same time, the compression spring 546 is elastically deformed. When the conical sleeve block 547 is no longer in contact with the conical block 562, the compression spring 546 resets the two conical sleeve blocks 547. In the process that the conical sleeve blocks 547 reciprocate, they cause the square mesh 549 to continuously bend and deform. At this time, in the process that the square mesh 549 continuously shakes, the impurities in the mesh holes can effectively fall off.

[0046] The working principle and use process of the present application are as follows:

[0047] The fish attracting lamp 4 is started, the light emitted by the fish attracting lamp 4 causes the fish in the upstream river to gather at the buffer fish lane box 51, at this time, the fishway 2 is inclined, the water in the upstream flows along the top of the buffer fish lane box 51 into the inside of the fishway 2, the water carries the fish into the downstream along the fishway 2, in the process of water flow, the water flows through the square pipe 52 into the inside of the gate chamber 1, the water flows through the other end square pipe 52 into the inside of the fishway 2, in the process of water flow in the gate chamber 1, the square fan roller 53 rotates reversely, the square fan roller 53 drives the rotating rod 541 and the disc 542 to rotate in the process of rotation, the disc 542 drives the conveying belt 543 and the strip shell 544 to rotate, the strip shell 544 drives the sliding rod 545, the conical sleeve block 547 and the water baffle 548 to rotate reversely, the water baffle 548 reversely rotates in the process, which can hinder the flow direction of the water flow, delay the flow rate of the water flow, avoid the damage or influence of the too fast water flow on the fish. When the conical sleeve block 547 moves reversely, the conical sleeve block 547 drives the square net 549 to move, the square net 549 moves in the process, which can filter the impurities in the water, prevent the impurities in the water flow from passing through the fishway 2 into the downstream river together with the fish, avoid the collision of the fish and the impurities, and reduce the damage to the fish body. The fish school can smoothly pass through the fishway without external interference, so as to avoid the injury or death of the fish.

[0048] When the impurities are accumulated too much in the square net 549, the thrust generated by the impurities and the water causes the square net 549 to deform, the square net 549 drives the conical sleeve block 547 and the sliding rod 545 to slide in the strip shell 544, the two sliding rods 545 move close to each other, the sliding rod 545 drives the conical sleeve block 547 and the water baffle 548 to move close to each other, in the process of the plurality of water baffles 548 moving close to each other, the water flow can be hindered gradually at different positions, the water flow speed is further balanced, the water flow can still flow gently when the impurities accumulate, and any damage to the fish school or the ecological environment is avoided. When the square net 549 above the conveying belt 543 moves to the lower side of the conveying belt 543, the impurities stuck in the square net 549 will automatically fall, which facilitates the subsequent square net 549 to move to the upper side of the conveying belt 543 to filter the impurities.

[0049] When the rotating rod 541 rotates, the rotating rod 541 drives the reciprocating screw rod 551 to rotate, the two reciprocating screw rods 551 drive the two threaded plates 552 to move close to each other along the inner wall of the buffer fish channel box 51, the threaded plate 552 drives the bending plate 553 and the extrusion plate 554 to move close to each other, the extrusion plate 554 drives the sealing sleeve 555 to move close to each other, and in the process of moving close to each other, the extrusion plate 554 and the sealing sleeve 555 can gradually slide in the inside of the water storage shell 556, extrude the water flowing in the inside of the water storage shell 556, make the water in the inside of the water storage shell 556 enter the inside of the connecting pipe 557, the water flow enters the inside of the strip-shaped box 558 through the connecting pipe 557, and the water flow is discharged outward through the water discharge port 559 arranged at the strip-shaped box 558, so as to drain the fish gathered at the fish lamp 4, expand the flow of the water flowing into the fishway 2, and make the expanded water flow promote the gathered fish to enter the inside of the fishway 2 faster, improve the speed of the fish group entering the fishway, and improve the passing efficiency of the fishway. When the threaded plate 552 moves close to each other, the threaded plate 552 drives the fixed plate 561 and the conical block 562 to move close to each other, and the plurality of conical blocks 562 are arranged at the same interval, at this time, the moving conical block 562 will contact the outer wall of the conical sleeve block 547 rotating in the opposite direction, be extruded by the inclined surface of the conical block 562, make the two adjacent conical sleeve blocks 547 drive the sliding rod 545 to move close to each other in the inside of the strip-shaped shell 544, and be elastically deformed by the extrusion spring 546, when the conical sleeve block 547 is no longer in contact with the conical block 562, the extrusion spring 546 makes the two conical sleeve blocks 547 reset, and in the process of reciprocating sliding of the conical sleeve block 547, the conical sleeve block 547 makes the square net 549 continuously bend and deform, at this time, the square net 549 continuously shakes, which can further promote the impurities in the mesh of the square net 549 to fall off, and improve the subsequent filtering effect of the square net 549 on the impurities.

[0050] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one from another entity or action, without necessarily requiring or implying that there is any such relationship or order between such entities or actions. Also, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0051] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An adjustable fish-attracting device for the entrance area of ​​a fish passage, comprising two gate chambers (1), one end of which is fixedly connected to a fish passage (2), a connecting plate (3) fixedly connected to the top of the gate chamber (1), and a fish-attracting lamp (4) fixedly connected to one side of the connecting plate (3), characterized in that: Also include; adjustable fish collecting mechanism (5), the adjustable fish collecting mechanism (5) includes the buffer fish lane box (51) fixedly connected between two gate chambers (1), the top of the buffer fish lane box (51) is provided with an opening, both sides of the gate chamber (1) are communicated with square tubes (52), the inner wall of the gate chamber (1) is rotatably connected with three square fan rollers (53), the inner wall of the square fan roller (53) is provided with a speed reduction assembly (54), for slowing down the flowing water; the speed reduction assembly (54) includes a rotating rod (541) fixedly connected to the inner wall of the square fan roller (53), both ends of the rotating rod (541) are rotatably connected with a disc (542), the outer wall of the disc (542) is rotatably connected with a conveyor belt (543); the conveyor belt (543) is arranged in the buffer fish lane box (51), the outer wall of the conveyor belt (543) is provided with a plurality of strip shells (544) around, both ends of the inner wall of the strip shell (544) are slidably connected with a sliding rod (545); two sliding rods (545) are fixedly connected with an extrusion spring (546), the extrusion spring (546) is arranged in the strip shell (544), the top end of the outer wall of the sliding rod (545) is fixedly connected with a conical sleeve block (547); one side of the conical sleeve block (547) is fixedly connected with a water baffle (548) at both ends, adjacent two conical sleeve blocks (547) are fixedly connected with a square net (549).

2. The adjustable fish collection device for a fishway entrance area according to claim 1, characterized in that: The outer wall of the rotating rod (541) is provided with an auxiliary assembly (55), the auxiliary assembly (55) includes a reciprocating screw rod (551) fixedly connected to the outer wall of the rotating rod (541) near both ends of the disc (542), one end of the outer wall of the reciprocating screw rod (551) is threadedly connected with a threaded plate (552).

3. The adjustable fish collection device for a fishway entrance area according to claim 2, characterized in that: The top of the threaded plate (552) is slidably connected to the inner wall top of the buffer fish lane box (51), the bottom of the threaded plate (552) is fixedly connected with a bent plate (553), one end of the bent plate (553) is fixedly connected with an extrusion plate (554).

4. The adjustable fish collection apparatus for a fishway entrance area according to claim 3, characterized in that: The outer wall of the extrusion plate (554) is fixedly connected with a sealing sleeve (555), the inner wall bottom of the buffer fish lane box (51) is fixedly connected with a water storage shell (556), both sides of the water storage shell (556) are provided with an opening, one side of the outer wall of the water storage shell (556) is communicated with a connecting pipe (557).

5. The adjustable fish collection device for a fishway entrance area according to claim 4, characterized in that: One end of the connecting pipe (557) away from the water storage shell (556) is communicated with a strip box (558), one side of the outer wall of the strip box (558) is fixedly connected to one side of the outer wall of the buffer fish lane box (51), a drainage opening (559) is formed in the top of the strip box (558).

6. The adjustable fish collection apparatus for a fishway entrance area according to claim 5, characterized in that: The side wall of the threaded plate (552) is provided with a cleaning assembly (56), the cleaning assembly (56) includes a fixed plate (561) fixedly connected to one side of the threaded plate (552), a plurality of conical blocks (562) are fixedly connected to one side of the fixed plate (561).

Images