A device for capturing pupae

Abstract

The application provides a larva capturing device and relates to the field of mosquito research, which comprises a capturing cylinder, a capturing connecting floating plate, a capturing driving water pump, a capturing connecting piece, a capturing connecting disc, a capturing connecting box, a capturing driving mechanism and a worm egg capturing mechanism; the capturing connecting floating plate is fixedly connected to the outer side of the upper end of the capturing cylinder; the capturing driving water pump is fixedly connected to the upper left side of the capturing connecting floating plate; the capturing connecting piece is fixedly connected to the middle position inside the capturing cylinder, and a sliding groove structure is arranged on the outer periphery of the capturing connecting piece; the capturing connecting disc is slidingly connected to the upper end inside the capturing cylinder; the capturing connecting box is fixedly connected to the lower end right side of the capturing connecting disc; the capturing driving mechanism is arranged inside the capturing cylinder; and the worm egg capturing mechanism is arranged below the capturing connecting disc, so that the efficiency of larva capturing is improved, the labor intensity of experimenters is reduced, and the problems of less larva quantity and low capturing efficiency in one-time capturing are solved.

Description

Technical Field

[0001] This invention relates to the field of mosquito research technology, and in particular to a mosquito larvae trapping device. Background Technology

[0002] Mosquito larvae are an important stage in the mosquito life cycle. By studying the growth, development, molting process, and metamorphosis into adult mosquitoes, we can gain a comprehensive understanding of the mosquito life cycle. This is crucial for developing effective mosquito control strategies. Current research on mosquito larvae generally requires researchers to collect them in the wild, usually using buckets to collect larvae from water bodies.

[0003] The present invention, with publication number CN102885018B, relates to a mosquito larvae collection device powered by solar photovoltaic power generation, belonging to the field of new energy application technology. A solar cell is connected to a photovoltaic controller via conductive wires. The photovoltaic controller is connected to an energy storage battery via conductive wires. The energy storage battery is connected to an information processor via conductive wires. The information processor is connected to an image sensor and a power unit via conductive wires. The solar cell generates current under sunlight. This current is input to the photovoltaic controller for adjustment via conductive wires, and then to the energy storage battery for storage. The energy storage battery outputs current via conductive wires to power the information processor. The image sensor converts detected image information into electrical signals, which are input to the information processor via conductive wires. The information processor processes the received image information and controls the power unit to start working according to a set program. Mosquito larvae within the catch net area fall into a transparent container from an opening at the bottom of the boom with the water flow.

[0004] However, in existing methods of capturing mosquito larvae, the larvae are quite agile in the water, and the use of a trap can easily disturb them, resulting in a small number of larvae being caught at one time. This requires multiple catches to reach the number observed in the experiment, leading to low capture efficiency. Summary of the Invention

[0005] In view of this, the present invention provides a mosquito larvae trapping device, which realizes the collection of insect eggs, improves the efficiency of mosquito larvae trapping, facilitates the trapping of mosquito larvae, reduces manual operation, and alleviates the labor intensity of experimental personnel.

[0006] The present invention provides a mosquito larvae capture device with the purpose and effect of including a capture cylinder, a capture connecting float, a capture driving water pump, a capture limiting component, a capture connecting component, a capture connecting plate, a capture connecting box, a capture driving mechanism, and an insect egg capture mechanism;

[0007] The capture connection float is fixedly connected to the outer side of the upper end of the capture cylinder;

[0008] The capture drive water pump is fixedly connected to the upper left side of the capture connection float, and the outlet pipe of the capture drive water pump extends into the water area.

[0009] The capture limiting component is fixedly connected to the inside left side of the capture cylinder;

[0010] The capture connector is fixedly connected to the middle position inside the capture cylinder, and a groove structure is provided on the outer periphery of the capture connector.

[0011] The capture connecting plate has a disc-shaped structure. The capture connecting plate is slidably connected to the upper part of the inside of the capture cylinder. The capture connecting plate is slidably connected to the capture limiting member and the capture connecting member.

[0012] The capture connection box is fixedly connected to the lower right side of the capture connection plate;

[0013] The capture drive mechanism is located inside the capture cylinder;

[0014] The insect egg capture mechanism is located below the capture connection plate.

[0015] Furthermore, the capture drive mechanism includes: a limiting connecting shaft, a fixing connecting rope, and a positioning lead block;

[0016] The limiting connecting shaft is rotatably connected to the bottom of the capture cylinder;

[0017] The upper end of the fixed connecting rope is wound around the outer circumference of the limiting connecting shaft;

[0018] The positioning lead block is fixedly connected to the lower end of the fixing connecting rope.

[0019] Furthermore, the capture drive mechanism also includes: a positioning locking bolt;

[0020] The positioning locking bolt is threadedly connected to the bottom of the capture cylinder, and the front end of the positioning locking bolt is rotatably connected to a brake shoe structure. The brake shoe structure of the positioning locking bolt is in frictional contact with the limiting connection shaft.

[0021] Furthermore, the capture drive mechanism also includes: a first filter screen, a second filter screen, filter cotton, and a capture inlet pipe;

[0022] The first filter screen is fixedly connected to the upper right side of the outer periphery of the capture cylinder, and the first filter screen is located below the capture connection float plate;

[0023] The second filter screen is fixedly connected to the lower right side of the capture limiting member;

[0024] The filter cotton is fixedly connected to the lower end of the inside of the capture limiting member;

[0025] The upper end of the capture inlet pipe is fixedly connected to the inlet pipe of the capture drive water pump, and the lower end of the capture inlet pipe is located in the middle of the inside of the capture limiting component.

[0026] Furthermore, the insect egg capture mechanism includes: a capture drive water wheel, a first transmission gear, a transmission connecting shaft, and a second transmission gear;

[0027] The capture drive water wheel is connected inside the capture limiting component;

[0028] The first transmission gear is coaxially and fixedly connected to the right side of the capture drive water turbine;

[0029] The transmission shaft is rotatably connected inside the capture connector;

[0030] The second transmission gear is coaxially and fixedly connected to the outer circumference of the transmission connection shaft, and the second transmission gear meshes with the first transmission gear.

[0031] Furthermore, the insect egg capture mechanism also includes: a capture drive screw and a capture drive slider;

[0032] The capture drive screw is coaxially and fixedly connected to the upper end of the transmission connection shaft, and the capture drive screw is a reciprocating screw structure.

[0033] The capture drive slider is slidably connected inside the groove of the capture connector, and the capture drive slider is threadedly connected to the capture drive screw.

[0034] Furthermore, the insect egg capture mechanism also includes: a capture trigger pin, a capture connecting spring, and a reset trigger;

[0035] The capture trigger pin is slidably connected inside the capture connection box;

[0036] The capture connection spring is fixedly connected to the right end of the capture trigger pin;

[0037] The reset trigger is fixedly connected to the outer periphery of the capture connector, and the reset trigger and the capture trigger pin together form a wedge structure.

[0038] Furthermore, the insect egg capture mechanism also includes: a trapping lamp, a capture trigger slider, a trigger connecting spring, a trigger rod, and a support spring component;

[0039] The trapping light is fixedly connected inside the capture connection plate;

[0040] The capture trigger slider is provided in two sets, and the two sets of capture trigger sliders are slidably connected to the inside of the capture connection disk. Both sets of capture trigger sliders are provided with a rectangular groove structure.

[0041] Two sets of trigger connection springs are provided. The two sets of trigger connection springs are fixedly connected to the lower end of the capture connection disk, and the lower end of both sets of trigger connection springs is fixedly connected to the capture trigger slider.

[0042] The trigger rod is provided in two sets, and the two sets of trigger rods are fixedly connected to the inside of the capture cylinder. Both sets of trigger rods are located at the lower end of the capture trigger slider.

[0043] The supporting spring is fixedly connected inside the capture cylinder, and the upper end of the supporting spring is fixedly connected to the capture connecting plate.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] This invention, through the design of a capture-driven mechanism, activates a capture-driven water pump. This pump draws water from inside the capture cylinder through a capture inlet pipe. During the water extraction process, a second filter screen and filter cotton filter the mosquito larvae, trapping them inside the capture cylinder. Simultaneously, because the lower end of the capture inlet pipe is located in the middle of the capture cylinder, a section of water can remain inside for the mosquito larvae to survive. As the capture-driven water pump continues to pump water, water from the water area carries mosquito larvae continuously into the capture cylinder, facilitating mosquito larva capture, improving capture efficiency, reducing manual operation, and alleviating the workload of experimental personnel.

[0046] This invention utilizes an insect egg capture mechanism. When the trapping lamp is activated, it attracts mosquitoes. After the mosquitoes lay their eggs inside the capture connecting plate, the capture drive water wheel rotates, driving the first transmission gear. This first transmission gear then drives the second transmission gear, which in turn drives the transmission connecting shaft. The transmission connecting shaft then drives the capture drive screw, which in turn moves the capture drive slider up and down. The downward movement of the capture drive slider moves the capture trigger pin down, which in turn moves the capture connecting plate down. This downward movement of the capture connecting plate further moves the capture trigger slider down. Once the capture trigger slider contacts the trigger rod, it is pushed upwards, and water mixed with insect eggs is discharged into the capture cylinder through the rectangular groove of the capture trigger slider. The capture trigger pin continues to move downwards and contacts the reset trigger, which then pushes it to the right. Under the action of the supporting spring, the capture connecting plate resets. During this reset process, water flows through the first filter screen into the capture connecting plate, thus collecting the insect eggs and improving the efficiency of mosquito larvae capture. Attached Figure Description

[0047] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0048] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0049] In the attached diagram:

[0050] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0051] Figure 2 This is a schematic diagram of the first filter structure according to an embodiment of the present invention.

[0052] Figure 3 This is a schematic diagram of the second filter structure according to an embodiment of the present invention.

[0053] Figure 4 This is a schematic diagram of the capture drive mechanism structure according to an embodiment of the present invention.

[0054] Figure 5 This is a schematic diagram of the insect egg capture mechanism according to an embodiment of the present invention.

[0055] Figure 6 This is a schematic diagram of the capture drive slider structure according to an embodiment of the present invention.

[0056] Figure 7 This is a schematic diagram of the trapping lamp structure according to an embodiment of the present invention.

[0057] Figure 8 This is a schematic diagram of the capture trigger pin structure according to an embodiment of the present invention.

[0058] List of reference numerals

[0059] 1. Capture cylinder; 101. Limiting connecting shaft; 102. Fixing connecting rope; 103. Positioning lead block; 104. Positioning locking bolt; 105. First filter screen; 106. Second filter screen; 107. Filter cotton; 108. Capture inlet pipe; 2. Capture connecting float; 3. Capture drive water pump; 4. Capture limiting component; 5. Capture connecting component; 6. Capture connecting disc; 601. Capture drive water wheel; 602. First transmission gear; 603. Transmission connecting shaft; 604. Second transmission gear; 605. Capture drive lead screw; 606. Capture drive slider; 607. Capture trigger pin; 608. Capture connecting spring; 609. Reset trigger component; 610. Trapping light; 611. Capture trigger slider; 612. Trigger connecting spring; 613. Trigger rod; 614. Support spring component; 7. Capture connecting box. Detailed Implementation

[0060] Example 1: Please refer to Figures 1 to 5 As shown:

[0061] The present invention provides a mosquito larvae capture device, comprising a capture cylinder 1, a capture connecting float 2, a capture driving water pump 3, a capture limiting member 4, a capture connecting member 5, a capture connecting plate 6, a capture connecting box 7, and a capture driving mechanism;

[0062] The capture connection float 2 is fixedly connected to the outer side of the upper end of the capture cylinder 1;

[0063] The capture drive water pump 3 is fixedly connected to the upper left side of the capture connection float 2, and the outlet pipe of the capture drive water pump 3 extends into the water area.

[0064] The capture limiting component 4 is fixedly connected to the inside left side of the capture cylinder 1;

[0065] The capture connector 5 is fixedly connected to the middle position inside the capture cylinder 1, and a groove structure is provided on the outer periphery of the capture connector 5.

[0066] The capture connection disk 6 has a disc-shaped structure. The capture connection disk 6 is slidably connected to the upper part of the inside of the capture cylinder 1. The capture connection disk 6 is slidably connected to the capture limiting member 4 and to the capture connecting member 5.

[0067] The capture connection box 7 is fixedly connected to the lower right side of the capture connection disk 6;

[0068] The capture drive mechanism is located inside the capture cylinder 1;

[0069] The insect egg capture mechanism is located below the capture connection tray 6.

[0070] The capture drive mechanism includes: a limit connecting shaft 101, a fixed connecting rope 102, a positioning lead block 103, a positioning locking bolt 104, a first filter screen 105, a second filter screen 106, filter cotton 107, and a capture water inlet pipe 108.

[0071] The limiting connecting shaft 101 is rotatably connected to the lower part of the capture cylinder 1;

[0072] The upper end of the fixed connecting rope 102 is wound around the outer periphery of the limiting connecting shaft 101;

[0073] The positioning lead block 103 is fixedly connected to the lower end of the fixed connecting rope 102;

[0074] The positioning locking bolt 104 is threadedly connected to the bottom of the capture cylinder 1. The front end of the positioning locking bolt 104 is rotatably connected to a brake shoe structure, and the brake shoe structure of the positioning locking bolt 104 is in frictional contact with the limiting connection shaft 101.

[0075] The first filter screen 105 is fixedly connected to the upper right side of the outer periphery of the capture cylinder 1, and the first filter screen 105 is located below the capture connection float 2;

[0076] The second filter screen 106 is fixedly connected to the lower right side of the capture limiting member 4;

[0077] Filter cotton 107 is fixedly connected to the lower inner end of the capture limiting member 4;

[0078] The upper end of the capture inlet pipe 108 is fixedly connected to the inlet pipe of the capture drive water pump 3, and the lower end of the capture inlet pipe 108 is located in the middle of the inside of the capture limiting member 4.

[0079] In use, when mosquito larvae need to be captured, chopped straw is placed inside the capture cylinder 1, and then the capture cylinder 1 is placed in a clean water body such as a pond. Water flows into the capture cylinder 1 through the first filter screen 105, filtering out debris in the water. The mosquito larvae in the water enter the capture cylinder 1 through the first filter screen 105, thus collecting the mosquito larvae. Rotating the limiting connecting shaft 101 allows the fixed connecting rope 102 to be extended or retracted. After adjusting the fixed connecting rope 102 to a suitable length, the positioning locking bolt 104 is tightened, fixing the limiting connecting shaft 101. The positioning lead block 103 is then thrown into the water, and the positioning lead block... Block 103 sinks to the bottom of the water to fix the position of the capture cylinder 1. The capture drive water pump 3 is turned on, and the capture drive water pump 3 draws water out of the capture cylinder 1 through the capture water inlet pipe 108. During the water extraction process, the second filter screen 106 and filter cotton 107 filter the mosquito larvae, keeping them inside the capture cylinder 1. At the same time, since the lower end of the capture water inlet pipe 108 is located in the middle of the capture cylinder 1, a section of water can remain inside the capture cylinder 1 for the mosquito larvae to survive. As the capture drive water pump 3 continues to pump water, water in the water area carries mosquito larvae into the capture cylinder 1 continuously, which facilitates the capture of mosquito larvae, improves the capture efficiency, reduces manual operation, and reduces the labor intensity of the experimental personnel.

[0080] Example 2:

[0081] Based on Example 1, such as Figures 1 to 8 As shown

[0082] The insect egg capture mechanism includes: a capture drive waterwheel 601, a first transmission gear 602, a transmission connecting shaft 603, a second transmission gear 604, a capture drive screw 605, a capture drive slider 606, a capture trigger pin 607, a capture connecting spring 608, a reset trigger 609, a trapping lamp 610, a capture trigger slider 611, a trigger connecting spring 612, a trigger rod 613, and a support spring 614.

[0083] The capture drive water wheel 601 is connected to the inside of the capture limiting member 4;

[0084] The first transmission gear 602 is coaxially and fixedly connected to the right side of the capture drive water turbine 601;

[0085] The transmission connecting shaft 603 is rotatably connected inside the capture connecting member 5;

[0086] The second transmission gear 604 is coaxially and fixedly connected to the outer periphery of the transmission connection shaft 603, and the second transmission gear 604 meshes with the first transmission gear 602.

[0087] The capture drive screw 605 is coaxially and fixedly connected to the upper end of the transmission connection shaft 603. The capture drive screw 605 is a reciprocating screw structure.

[0088] The capture drive slider 606 is slidably connected inside the groove of the capture connector 5, and the capture drive slider 606 is threadedly connected to the capture drive screw 605.

[0089] The capture trigger pin 607 is slidably connected inside the capture connection box 7;

[0090] The capture connection spring 608 is fixedly connected to the right end of the capture trigger pin 607;

[0091] The reset trigger 609 is fixedly connected to the outer periphery of the capture connector 5, and the reset trigger 609 and the capture trigger pin 607 together form a wedge structure.

[0092] The trap light 610 is fixedly connected inside the capture connection plate 6;

[0093] Two sets of capture trigger sliders 611 are provided. The two sets of capture trigger sliders 611 are slidably connected to the inside of the capture connection disk 6. Both sets of capture trigger sliders 611 are provided with rectangular groove structures.

[0094] Two sets of trigger connection springs 612 are provided. The two sets of trigger connection springs 612 are fixedly connected to the lower end of the capture connection disk 6, and the lower end of the two sets of trigger connection springs 612 is fixedly connected to the capture trigger slider 611.

[0095] Two sets of trigger rods 613 are provided. The two sets of trigger rods 613 are fixedly connected to the inside of the capture cylinder 1. Both sets of trigger rods 613 are located at the lower end of the capture trigger slider 611.

[0096] The support spring 614 is fixedly connected inside the capture cylinder 1, and the upper end of the support spring 614 is fixedly connected to the capture connection plate 6.

[0097] In use, a certain amount of water is poured into the capture connection plate 6, and the trapping lamp 610 is turned on. The trapping lamp 610 attracts mosquitoes. After the mosquitoes lay their eggs inside the capture connection plate 6, the capture drive water wheel 601 is rotated by the water flow. The rotation of the capture drive water wheel 601 drives the first transmission gear 602 to rotate, which in turn drives the second transmission gear 604 to rotate. The rotation of the second transmission gear 604 drives the transmission connecting shaft 603 to rotate, which in turn drives the capture drive screw 605 to rotate. The rotation of the capture drive screw 605 drives the capture drive slider 606 to move up and down. After the capture drive slider 606 moves upward above the capture trigger pin 607, it moves downward, causing the capture trigger pin 607 to move downward. 07 moves downwards, causing the capture trigger pin 607 to move downwards, which in turn causes the capture connecting plate 6 to move downwards. The capture connecting plate 6 moves downwards, causing the capture trigger slider 611 to move downwards. After the capture trigger slider 611 moves downwards and contacts the trigger rod 613, it is pushed upwards. Water mixed with insect eggs is discharged into the capture cylinder 1 through the rectangular groove of the capture trigger slider 611. After the capture trigger pin 607 continues to move downwards and contacts the reset trigger 609, it is squeezed to the right. Under the action of the support spring 614, the capture connecting plate 6 is reset. During the reset process of the capture connecting plate 6, water flows through the first filter screen 105 and enters the interior of the capture connecting plate 6, realizing the collection of insect eggs and improving the efficiency of mosquito larva capture.

Claims

1. A mosquito larvae trapping device, comprising a trapping cylinder (1), a trapping connecting float (2), a trapping drive water pump (3), a trapping limiting member (4), a trapping connector (5), a trapping connecting plate (6), a trapping connecting box (7), a trapping drive mechanism, and an insect egg trapping mechanism; characterized in that: The capture connection float (2) is fixedly connected to the upper outer side of the capture cylinder (1); the capture drive water pump (3) is fixedly connected to the upper left side of the capture connection float (2), and the outlet pipe of the capture drive water pump (3) extends into the water area; the capture limiting member (4) is fixedly connected to the inner left side of the capture cylinder (1); the capture connector (5) is fixedly connected to the middle position inside the capture cylinder (1), and a sliding groove structure is provided on the outer periphery of the capture connector (5); the capture connection plate (6) is a disc-shaped structure, and the capture connection plate (6) is slidably connected to the upper inside of the capture cylinder (1), and the capture connection plate (6) is slidably connected to the capture limiting member (4), and the capture connection plate (6) is slidably connected to the capture connector (5); the capture connection box (7) is fixedly connected to the lower right side of the capture connection plate (6); the capture drive mechanism is located inside the capture cylinder (1); the insect egg capture mechanism is located below the capture connection plate (6); The capture drive mechanism further includes: a first filter screen (105), a second filter screen (106), filter cotton (107), and a capture inlet pipe (108); the first filter screen (105) is fixedly connected to the upper right side of the outer periphery of the capture cylinder (1), and the first filter screen (105) is located below the capture connecting float (2); the second filter screen (106) is fixedly connected to the lower right side of the capture limiting member (4); the filter cotton (107) is fixedly connected to the lower end of the capture limiting member (4); the upper end of the capture inlet pipe (108) is fixedly connected to the inlet pipe of the capture drive water pump (3), and the lower end of the capture inlet pipe (108) is located in the middle position inside the capture limiting member (4); The insect egg capture mechanism includes: a capture drive water wheel (601), a first transmission gear (602), a transmission connecting shaft (603), and a second transmission gear (604); the capture drive water wheel (601) is rotatably connected inside the capture limiting member (4); the first transmission gear (602) is coaxially fixedly connected to the right side of the capture drive water wheel (601); the transmission connecting shaft (603) is rotatably connected inside the capture connecting member (5); the second transmission gear (604) is coaxially fixedly connected to the outer periphery of the transmission connecting shaft (603), and the second transmission gear (604) meshes with the first transmission gear (602); The insect egg capture mechanism further includes: a capture drive screw (605) and a capture drive slider (606); the capture drive screw (605) is coaxially fixedly connected to the upper end of the transmission connecting shaft (603), and the capture drive screw (605) is a reciprocating screw structure; the capture drive slider (606) is slidably connected inside the groove of the capture connector (5), and the capture drive slider (606) is threadedly connected to the capture drive screw (605); The insect egg capture mechanism further includes: a capture trigger pin (607), a capture connecting spring (608), and a reset trigger (609); the capture trigger pin (607) is slidably connected inside the capture connecting box (7); the capture connecting spring (608) is fixedly connected to the right end of the capture trigger pin (607); the reset trigger (609) is fixedly connected to the outer periphery of the capture connecting piece (5), and the reset trigger (609) and the capture trigger pin (607) together form a wedge structure; The insect egg capture mechanism further includes: a trapping lamp (610), a capture trigger slider (611), a trigger connecting spring (612), a trigger rod (613), and a support spring (614); the trapping lamp (610) is fixedly connected inside the capture connecting plate (6); two sets of capture trigger sliders (611) are provided, and the two sets of capture trigger sliders (611) are slidably connected inside the capture connecting plate (6), and both sets of capture trigger sliders (611) are provided with rectangular groove structures; two sets of trigger connecting springs (612) are provided, and the two sets of trigger connecting springs (612) are slidably connected inside the capture connecting plate (6), and both sets of capture trigger sliders (611) are provided with rectangular groove structures; The connecting springs (612) are fixedly connected to the lower end of the capture connecting plate (6), and the lower ends of the two sets of trigger connecting springs (612) are fixedly connected to the capture trigger slider (611); the trigger rods (613) are provided in two sets, and the two sets of trigger rods (613) are fixedly connected to the inside of the capture cylinder (1), and the two sets of trigger rods (613) are both set at the lower end of the capture trigger slider (611); the supporting spring (614) is fixedly connected to the inside of the capture cylinder (1), and the upper end of the supporting spring (614) is fixedly connected to the capture connecting plate (6).

2. The mosquito larvae trapping device as described in claim 1, characterized in that: The capture drive mechanism includes: a limiting connecting shaft (101), a fixing connecting rope (102), and a positioning lead block (103); the limiting connecting shaft (101) is rotatably connected to the lower part of the capture cylinder (1); the upper end of the fixing connecting rope (102) is wound around the outer periphery of the limiting connecting shaft (101); and the positioning lead block (103) is fixedly connected to the lower end of the fixing connecting rope (102).

3. The mosquito larvae trapping device as described in claim 2, characterized in that: The capture drive mechanism also includes: a positioning locking bolt (104); the positioning locking bolt (104) is threadedly connected to the bottom of the capture cylinder (1), and the front end of the positioning locking bolt (104) is rotatably connected to a brake shoe structure, and the brake shoe structure of the positioning locking bolt (104) is in frictional contact with the limiting connecting shaft (101).

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