A device for weed removal in tea plantations

Abstract

The present application relates to tea tree planting technical field, disclose a kind of weed removal device for tea tree planting, including drive trolley and setting on drive trolley shell one and shell two, shell two is fixedly arranged in the just above shell one, and shell one is communicated with shell two, the inside of shell two is provided with grass shoveling assembly;The present application is set by grass shoveling assembly, so that oil cylinder one drives mounting plate and oil cylinder two, shovel lifting, oil cylinder two drives two symmetrical inclined shovels open and close, can be in soil with weed and its root system associated part of soil whole shovel, solve the problem that only above stem of weed can be cut in prior art and cannot remove root system;Cooperate with soil breaking component to break up and separate the shoveling object, and weed and its root system are collected by grass storage box, realize the complete removal of weed from root system to stem, effectively avoid weed growth again due to root system residue, significantly improve weeding effect.

Description

Technical Field

[0001] This invention relates to the field of tea tree cultivation technology, specifically a weed removal device for tea tree cultivation. Background Technology

[0002] Tea trees are perennial evergreen woody plants whose leaves can be processed into tea. They prefer warm and humid climates and mostly grow in well-drained acidic soil. Proper row spacing and sunlight exposure are crucial during planting. Weed control devices for tea plantations are tools specifically designed for tea gardens. They remove weeds through mechanical weeding or physical suppression, preventing weeds from competing with tea trees for nutrients and water. This also reduces the use of chemical herbicides, protecting the tea garden ecosystem while improving weed control efficiency. They are suitable for the complex terrain and varying spacing of tea trees in tea gardens.

[0003] Chinese patent CN209105658U discloses a weeding device for the maintenance of camellia trees, including a weeding machine housing, a push handle, and casters. The push handle is fixedly connected to the outer wall of the weeding machine housing, and casters are located at the bottom of the housing. An electric telescopic rod is installed on the inner bottom wall of the housing, with a support arm fixedly connected to its upper end. A lifting column is fixedly connected to the lower end of the support arm. The lower end of the lifting column penetrates the bottom wall of the housing and reaches the outer cavity of the housing. A circular sleeve is fixedly connected to a section of the side wall of the outer cavity of the housing. This solution overcomes the shortcomings of existing technologies, has a reasonable design, and a compact structure. The height of the weeding device can be adjusted promptly according to the height of the weeds. The distance between the rotating wheels can be quickly and easily adjusted. Cut weeds do not scatter, subsequent processing is easier, the overall weeding effect is better, and its practicality is stronger.

[0004] As shown in the aforementioned patent, existing weeding devices for tea plantations generally cut weeds using rotating cutting blades. However, this method can only cut the stems of weeds above the ground and cannot remove the roots, allowing the weeds to continue growing and making it difficult to achieve a good weeding effect.

[0005] Therefore, it is necessary to provide a weed removal device for tea plantation to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a weed removal device for tea tree planting. By setting up a weed-shoveling component, it can penetrate deep into the soil to remove weeds and their roots along with some soil as a whole, solving the problem in the prior art that it can only cut the stems of weeds on the ground but cannot remove the roots.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a weed removal device for tea tree planting, comprising a drive trolley and a housing 1 and a housing 2 disposed on the drive trolley. The housing 2 is fixedly disposed directly above the housing 1, and the housing 1 and the housing 2 are connected. A weed removal assembly is disposed inside the housing 2. The weed removal assembly includes a hydraulic cylinder 1 fixedly mounted on the top wall of the housing 2, an installation plate disposed inside the housing 2, two hydraulic cylinders 2 fixedly mounted on the top of the installation plate, and two shovels respectively fixedly mounted on the output ends of the hydraulic cylinders 2. The two hydraulic cylinders 2 are inclined and symmetrical to each other, and the two shovels are inclined and symmetrical to each other. A through hole for the shovels to extend is provided on the bottom wall of the housing 1. A soil breaking assembly and a drive assembly for driving the soil breaking assembly to move horizontally are disposed inside the housing 1. A soil discharge assembly is disposed below the soil breaking assembly.

[0008] A further configuration of the present invention is as follows: the soil breaking assembly includes a soil breaking trough, an L-shaped plate fixedly installed on both sides of the soil breaking trough, and a hydraulic cylinder four fixedly installed on the L-shaped plate. A drive plate is fixedly installed on the output end of the hydraulic cylinder four, and a plurality of soil breaking rods are fixedly installed on the drive plate. The soil breaking rods penetrate the side wall of the soil breaking trough, and the soil breaking rods slide in cooperation with the side wall of the soil breaking trough.

[0009] A further configuration of the present invention is as follows: the driving assembly includes a support plate and a hydraulic cylinder three. The support plate is fixedly connected to the top wall of the housing one, the hydraulic cylinder three is fixedly mounted on the support plate, the output end of the hydraulic cylinder three passes through the support plate, and the output end of the hydraulic cylinder three is fixedly connected to the soil crushing trough.

[0010] A further provision of the present invention is that: a sieve plate is provided at the bottom of the soil crushing trough, the sieve plate is rotatably connected to the soil crushing trough via a rotating connector, a transmission assembly for driving the sieve plate to rotate is provided on the soil crushing trough, and a vibration motor is installed on the side wall of the soil crushing trough.

[0011] A further configuration of the present invention is as follows: the rotating connector includes a mounting base and a connecting base, the mounting base is fixedly connected to the soil crushing trough, the connecting base is fixedly connected to the side wall of the screen plate, and the mounting base and the connecting base are rotatably connected.

[0012] A further feature of the present invention is that a hay storage box is provided inside the housing, the top of the hay storage box is open, a notch is provided on the hay storage box, and one end of the sieve plate extends into the notch.

[0013] A further configuration of the present invention is as follows: the transmission assembly includes a hydraulic cylinder five, a connecting plate and an adjusting plate, the connecting plate is fixedly connected to the side wall of the soil crushing trough, the adjusting plate is fixedly connected to the side wall of the connecting seat, the top end of the hydraulic cylinder five is hinged to the connecting plate through a hinge member one, and the output end of the hydraulic cylinder five is hinged to the adjusting plate through a hinge member two.

[0014] A further configuration of the present invention is as follows: the soil discharge assembly includes a soil receiving trough, the soil receiving trough is disposed below the soil crushing trough, the bottom wall of the soil receiving trough is inclined, a soil discharge hopper is connected to the bottom of the soil receiving trough near the through hole, and a valve assembly is disposed at the bottom of the soil discharge hopper.

[0015] A further feature of the present invention is that a connecting column is fixedly installed in the middle of the bottom wall of the mounting plate, and a push block is fixedly installed at the bottom end of the connecting column. When the output end of the second hydraulic cylinder is in the retracted state, the bottom wall of the shovel and the bottom wall of the push block are at the same height.

[0016] A further provision of the present invention is that a camera is fixedly disposed at the bottom of the housing, and a camera is fixedly disposed at the front end of the housing.

[0017] In summary, the present invention has the following beneficial effects: The present invention, through the arrangement of the weed-shoveling component, enables the hydraulic cylinder one to drive the mounting plate and the hydraulic cylinder two, along with the shovels, to rise and fall. The hydraulic cylinder two drives the two symmetrically tilted shovels to open and close, allowing for deep soil penetration to remove weeds and their roots along with a portion of the soil. This solves the problem in the prior art that only the stems of weeds can be cut but the roots cannot be removed. Furthermore, the soil-crushing component separates the removed material from the soil, and the weeds and their roots are collected in the weed storage box, achieving thorough removal of weeds from roots to stems. This effectively prevents weeds from regrowth due to root residue, significantly improving the weeding effect.

[0018] Meanwhile, the intelligent drive vehicle enables the device to drive automatically and accurately locate weeds, improving the automation level and accuracy of weeding. The soil discharge component backfills the broken soil into the pits formed after weeding, realizing the immediate repair of the soil on the working surface, which helps maintain the integrity of the tea garden soil structure and further ensures the stability of the tea tree growth environment. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the bottom structure of the housing of the present invention;

[0021] Figure 3 This is a cross-sectional structural diagram of the first and second housings of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the grass-shoveling component of the present invention;

[0023] Figure 5 This is one of the structural schematic diagrams of the soil-breaking component of the present invention;

[0024] Figure 6 This is a second schematic diagram of the structure of the soil-breaking component of the present invention;

[0025] Figure 7 This is a schematic diagram of the rotating connector and transmission assembly of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the soil removal component of the present invention.

[0027] In the diagram: 1. Drive trolley; 2. Housing 1; 201. Through hole; 3. Housing 2; 4. Hydraulic cylinder 1; 5. Mounting plate; 6. Hydraulic cylinder 2; 7. Shovel; 8. Push block; 9. Connecting column; 10. Soil-breaking trough; 11. Support plate; 12. Hydraulic cylinder 3; 13. Screen plate; 14. L-shaped plate; 15. Hydraulic cylinder 4; 16. Drive plate; 17. Soil-breaking rod; 18. Vibrating motor; 19. Connecting seat; 20. Mounting seat; 21. Adjusting plate; 22. Connecting plate; 23. Hydraulic cylinder 5; 24. Hinge 1; 25. Hinge 2; 26. Soil-receiving trough; 27. Soil-discharging hopper; 28. Valve assembly; 29. ​​Baffle; 30. Camera 1; 31. Camera 2; 32. Hay storage box. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] Please see Figures 1 to 8In this embodiment of the invention, a weed removal device for tea plantation includes a drive trolley 1 and a housing 1 2 and a housing 2 3 mounted on the drive trolley 1. The housing 2 3 is fixedly positioned directly above the housing 1 2, and the housing 1 2 and housing 2 3 are connected. A weed-removing assembly is provided inside the housing 2 3. The weed-removing assembly includes a hydraulic cylinder 1 4 fixedly mounted on the top wall of the housing 2 3, a mounting plate 5 disposed inside the housing 2 3, two hydraulic cylinders 2 6 fixedly mounted on the top of the mounting plate 5, and two shovels 7 respectively fixedly mounted on the output ends of the hydraulic cylinders 2 6. The hydraulic cylinder 1 4 is a multi-stage hydraulic cylinder. The top of the housing 2 has an opening for the oil cylinder 2 6 to extend. Both oil cylinders 2 6 are inclined and symmetrical. Both shovels 7 are inclined and symmetrical, and the distance between the two shovels 7 gradually decreases from top to bottom. The bottom wall of the housing 2 has a through hole 201 for the shovels 7 to extend. The interior of the housing 2 is equipped with a soil-breaking component and a drive component for driving the soil-breaking component to move horizontally. Below the soil-breaking component is a soil-discharging component. The driving trolley 1 is an intelligent trolley, and the trolley body is equipped with ultrasonic radar, cameras and other components to assist in driving the trolley. The automatic driving mechanism of vehicle 1, using existing technology, will not be described in detail here. The bottom of vehicle 1 has a through-slot for the shovel 7 to extend. In actual use, vehicle 1 moves within the tea plantation area. When vehicle 1 detects weeds, its movement positions the weed-shoveling component directly above the weeds. Then, the output end of hydraulic cylinder 4 extends, causing the mounting plate 5 to move downwards, which in turn moves hydraulic cylinder 6 and the shovel 7 downwards until the bottom of the shovel 7 contacts the soil. Then, the output end of hydraulic cylinder 6 extends, causing the shovel 7 to tilt. The device moves downwards, positioning the roots of the weeds between the two shovels 7. Then, the output end of the hydraulic cylinder 4 is controlled to retract, causing the two shovels 7 to scoop up the weeds along with their roots and soil, and move them into the interior of the housing 3. The drive assembly then drives the soil-crushing component to move horizontally, positioning it below the shovels 7. The output ends of the two hydraulic cylinders 6 are then controlled to retract, causing the weeds, along with their roots and soil, between the two shovels 7 to fall downwards into the soil-crushing component. The soil-crushing component then pulverizes the soil, separating the weeds from the soil. Finally, the pulverized soil is discharged into the soil discharge component.

[0030] In this embodiment, preferably, a camera 30 is fixedly installed at the bottom of the housing 2 and a camera 31 is fixedly installed at the front end of the housing 2. The camera 30 can detect the location of weeds so as to accurately scoop up the weeds. The camera 31 can identify the environment around the driving vehicle so as to control the driving vehicle 1 to drive.

[0031] In this embodiment, preferably, a connecting column 9 is fixedly installed in the middle of the bottom wall of the mounting plate 5, and a push block 8 is fixedly installed at the bottom end of the connecting column 9. When the output end of the second hydraulic cylinder 6 is in the retracted state, the bottom wall of the shovel 7 and the bottom wall of the push block 8 are at the same height. When the weeds, along with their roots and soil, are shoveled up between the two shovels 7, as the output end of the second hydraulic cylinder 6 retracts, the push block 8 can push the weeds, along with their roots and soil, down between the two shovels 7, thus preventing the weeds, along with their roots and soil, from sticking to the two shovels 7.

[0032] In this embodiment, preferably, the soil-breaking assembly includes a soil-breaking trough 10, L-shaped plates 14 fixedly installed on both sides of the soil-breaking trough 10, and hydraulic cylinders 15 fixedly installed on the L-shaped plates 14. A drive plate 16 is fixedly installed on the output end of the hydraulic cylinders 15, and a plurality of soil-breaking rods 17 are fixedly installed on the drive plate 16. The soil-breaking rods 17 penetrate the side wall of the soil-breaking trough 10, and the soil-breaking rods 17 slide in cooperation with the side wall of the soil-breaking trough 10. The drive assembly includes a support plate 11 and a hydraulic cylinder 12. The support plate 11 is fixedly connected to the top wall of the housing 2, and the hydraulic cylinder 12 is fixedly installed on the support plate 11. The output end of the hydraulic cylinder 12 penetrates the support plate 11, and the output end of the hydraulic cylinder 12 is fixedly connected to the soil-breaking trough 10. Fixed connection; the bottom of the soil crushing trough 10 is provided with a screen plate 13, which is rotatably connected to the soil crushing trough 10 through a rotating connector. The soil crushing trough 10 is provided with a transmission component for driving the screen plate 13 to rotate; the two sets of soil crushing rods 17 do not contact each other when they move back and forth to prevent the weeds from being crushed; when the weeds, along with their roots and soil, enter the soil crushing trough 10, the output end of the control cylinder 3 12 is reciprocated to extend and retract, so that multiple soil crushing rods 17 are repeatedly inserted into the soil, thereby crushing the soil. The crushed soil passes through the screen holes on the screen plate 13 and falls down into the soil discharge component, while the weeds and their roots cannot be crushed due to their certain flexibility, so that the weeds remain above the screen plate 13.

[0033] In this embodiment, preferably, the rotating connector includes a mounting base 20 and a connecting base 19. The mounting base 20 is fixedly connected to the soil crushing trough 10, and the connecting base 19 is fixedly connected to the side wall of the screen plate 13. The mounting base 20 and the connecting base 19 are rotatably connected, thereby realizing the rotatable connection between the screen plate 13 and the soil crushing trough 10.

[0034] In this embodiment, preferably, a grass storage box 32 is provided inside the housing 2. The top of the grass storage box 32 is open, and a notch is provided on the grass storage box 32. One end of the sieve plate 13 extends into the notch. The grass storage box 32 can be removed from the housing 2 to remove weeds. After the soil in the soil crushing trough 10 is discharged, the sieve plate 13 is driven to rotate downward through the transmission component, so that the weeds slide along the surface of the sieve plate 13 into the grass storage box 32.

[0035] In this embodiment, preferably, the transmission assembly includes a hydraulic cylinder 23, a connecting plate 22, and an adjusting plate 21. The connecting plate 22 is fixedly connected to the side wall of the soil crushing trough 10, and the adjusting plate 21 is fixedly connected to the side wall of the connecting seat 19. The top end of the hydraulic cylinder 23 is hinged to the connecting plate 22 via a hinge 24, and the output end of the hydraulic cylinder 23 is hinged to the adjusting plate 21 via a hinge 25. By controlling the extension and retraction of the output end of the hydraulic cylinder 23, the adjusting plate 21 can be rotated, which in turn drives the connecting seat 19 to rotate. When the connecting seat 19 rotates, it drives the sieve plate 13 to rotate, so as to discharge the weeds above the sieve plate 13 into the grass storage box 32.

[0036] In this embodiment, preferably, a vibration motor 18 is installed on the side wall of the soil crushing trough 10. The vibration motor 18 can drive the soil crushing trough 10 to vibrate, thereby making the soil easier to break up and making the crushed soil easier to be discharged downward through the sieve holes on the sieve plate 13, and making the weeds easier to slide from the surface of the sieve plate 13 into the grass storage box 32.

[0037] In this embodiment, preferably, the soil discharge assembly includes a soil receiving trough 26, which is disposed below the soil crushing trough 10. The bottom wall of the soil receiving trough 26 is inclined. A soil discharge hopper 27 is connected to the bottom of the soil receiving trough 26 near the through hole 201. A valve assembly 28 is provided at the bottom of the soil discharge hopper 27. The valve assembly 28 can control the closing of the bottom opening of the soil discharge hopper 27. The bottom of the soil discharge hopper 27 is inclined towards the through hole 201. The valve assembly 28 includes a valve plate and a motor. The plate is used to seal the bottom opening of the soil discharge hopper 27. The valve plate is rotatably set inside the soil discharge hopper 27. The motor is fixedly installed on the soil discharge hopper 27, and the output end of the motor is connected to the valve plate to drive the valve plate to rotate. The valve assembly 28 is existing technology and will not be described in detail here. The soil in the soil crushing trough 10 falls down into the soil receiving trough 26 through the screen holes. When the weeds are scooped up by the shovel 7, the valve assembly 28 is opened to discharge a certain amount of crushed soil to fill the pits created by scooping up the weeds, thereby repairing the pits created by weeding.

[0038] In this embodiment, preferably, baffles 29 are fixedly installed on both sides of the bottom of the soil crushing trough 10, and the sieve plate 13 is arranged between the two baffles 29. By setting the baffles 29, when the weeds on the sieve plate 13 slide into the grass storage trough, the weeds will not fall off from both sides of the sieve plate 13.

[0039] Working principle: The drive trolley 1 moves in the tea tree planting area. When the drive trolley 1 detects weeds through the camera 30, the movement of the drive trolley 1 makes the weed-shoveling component directly above the weeds. Then, the output end of the hydraulic cylinder 4 is extended, causing the mounting plate 5 to move downward, which in turn drives the hydraulic cylinder 6 and the shovel 7 to move downward until the bottom of the shovel 7 contacts the soil. Then, the output end of the hydraulic cylinder 6 is extended, causing the shovel 7 to tilt downward, so that the roots of the weeds are located between the two shovels 7. Then, the output end of the hydraulic cylinder 4 is retracted, so that the two shovels 7 scoop up the weeds along with their roots and soil and move them into the interior of the housing 3.

[0040] The output end of the control cylinder 12 extends to drive the soil chute 10 to move horizontally to directly below the shovel 7. Then, the output ends of the two cylinders 6 retract, causing the weeds, along with their roots and soil, between the two shovels 7 to fall into the soil chute 10. The output end of the control cylinder 12 extends and retracts, causing multiple soil chute rods 17 to repeatedly insert into the soil, thereby breaking the soil. The crushed soil passes through the sieve holes on the sieve plate 13 and falls into the soil discharge assembly. The weeds and their roots, due to their flexibility, cannot be broken, so the weeds remain above the sieve plate 13, thus separating the weeds from the soil.

[0041] The output end of the control cylinder 23 retracts to drive the adjustment plate 21 to rotate, which in turn drives the connecting seat 19 to rotate. When the connecting seat 19 rotates, it drives the sieve plate 13 to rotate, which, in conjunction with the vibration of the vibration motor 18, discharges the weeds above the sieve plate 13 into the grass storage box 32.

[0042] Soil in the soil shredder 10 falls through the sieve holes into the soil receiving trough 26. After the weeds are scooped up by the shovel 7, the valve assembly 28 is opened to discharge a certain amount of soil to fill the pits created by scooping up the weeds, thereby repairing the pits created by weeding.

[0043] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A weed removal device for tea plantation, comprising a drive trolley (1) and a first housing (2) and a second housing (3) disposed on the drive trolley (1), the second housing (3) being fixedly disposed directly above the first housing (2), and the first housing (2) and the second housing (3) being connected, characterized in that: The interior of the second shell (3) is provided with a grass-shoveling assembly. The grass-shoveling assembly includes a hydraulic cylinder (4) fixedly installed on the top wall of the second shell (3), an installation plate (5) set inside the second shell (3), two hydraulic cylinders (6) fixedly installed on the top of the installation plate (5), and two shovels (7) fixedly installed on the output ends of the hydraulic cylinders (6). The two hydraulic cylinders (6) are inclined and symmetrical to each other, and the two shovels (7) are inclined and symmetrical to each other. The bottom wall of the first shell (2) is provided with a through hole (201) for the shovels (7) to extend out. The interior of the first shell (2) is provided with a soil-breaking assembly and a drive assembly for driving the soil-breaking assembly to move horizontally. The soil-discharging assembly is provided below the soil-breaking assembly. The soil breaking assembly includes a soil breaking trough (10), an L-shaped plate (14) fixedly installed on both sides of the soil breaking trough (10), and a hydraulic cylinder four (15) fixedly installed on the L-shaped plate (14). A drive plate (16) is fixedly installed on the output end of the hydraulic cylinder four (15). A plurality of soil breaking rods (17) are fixedly installed on the drive plate (16). The soil breaking rods (17) penetrate the side wall of the soil breaking trough (10) and slide in cooperation with the side wall of the soil breaking trough (10). The drive assembly includes a support plate (11) and a hydraulic cylinder (12). The support plate (11) is fixedly connected to the top wall of the housing (2). The hydraulic cylinder (12) is fixedly installed on the support plate (11). The output end of the hydraulic cylinder (12) passes through the support plate (11) and is fixedly connected to the soil crushing trough (10). The soil discharge assembly includes a soil receiving trough (26), which is located below the soil crushing trough (10). The bottom wall of the soil receiving trough (26) is inclined. A soil discharge hopper (27) is connected to the bottom of the soil receiving trough (26) near the through hole (201). A valve assembly (28) is provided at the bottom of the soil discharge hopper (27).

2. The weed removal device for tea tree planting according to claim 1, characterized in that: The bottom of the soil crushing trough (10) is provided with a sieve plate (13), which is rotatably connected to the soil crushing trough (10) through a rotating connector. The soil crushing trough (10) is provided with a transmission assembly for driving the sieve plate (13) to rotate, and a vibration motor (18) is installed on the side wall of the soil crushing trough (10).

3. The weed removal device for tea tree planting according to claim 2, characterized in that: The rotating connector includes a mounting base (20) and a connecting base (19). The mounting base (20) is fixedly connected to the soil crushing trough (10), and the connecting base (19) is fixedly connected to the side wall of the sieve plate (13). The mounting base (20) and the connecting base (19) are rotatably connected.

4. The weed removal device for tea tree planting according to claim 3, characterized in that: The housing (2) is provided with a hay storage box (32) inside. The top of the hay storage box (32) is open and a notch is provided on the hay storage box (32). One end of the sieve plate (13) extends into the notch.

5. The weed removal device for tea tree planting according to claim 4, characterized in that: The transmission assembly includes a hydraulic cylinder (23), a connecting plate (22), and an adjusting plate (21). The connecting plate (22) is fixedly connected to the side wall of the soil crushing trough (10), and the adjusting plate (21) is fixedly connected to the side wall of the connecting seat (19). The top end of the hydraulic cylinder (23) is hinged to the connecting plate (22) through a hinge (24), and the output end of the hydraulic cylinder (23) is hinged to the adjusting plate (21) through a hinge (25).

6. The weed removal device for tea tree planting according to claim 1, characterized in that: A connecting column (9) is fixedly installed in the middle of the bottom wall of the mounting plate (5), and a push block (8) is fixedly installed at the bottom end of the connecting column (9). When the output end of the second cylinder (6) is in the retracted state, the bottom wall of the shovel (7) and the bottom wall of the push block (8) are at the same height.

7. The weed removal device for tea tree planting according to claim 1, characterized in that: A camera 1 (30) is fixedly installed at the bottom of the housing 1 (2), and a camera 2 (31) is fixedly installed at the front end of the housing 1 (2).

Images