Intermittent double-row point applicator

Abstract

The intermittent double-row point fertilization device comprises a fertilizer cavity shell and a gear box, the fertilizer cavity shell is internally provided with a double-row point fertilization assembly, the double-row point fertilization assembly comprises a pipe body one and a pipe body two, the pipe body two is inserted into the pipe body one, and both ends of the pipe body two are respectively outwardly penetrated from both ends of the pipe body one, and both ends of the pipe body one are respectively provided with a first rotating wheel and a first gear; in summary, the intermittent double-row point fertilization device is connected with a fertilizer distributor through a top fertilizer inlet, and then the fertilizer is guided to fall into a fertilizer groove by a fertilizer discharge pipe; the fertilizer falls into two chambers, and the continuous rotation of a motor is converted into intermittent motion through two groups of groove wheel mechanisms, so that the first gear and the second gear are alternately rotated, and the first gear and the second gear rotate by an angle of 90° each time, the first rotating wheel and the second rotating wheel are rotated to realize fertilizer discharge, and finally, intermittent and alternate fertilization is realized, the overall structure is reasonable in design, the double-row plants are simultaneously intermittently fertilized, the efficiency is high, and the fertilizer utilization rate is high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of point fertilization, and particularly relates to an intermittent double-row point fertilization device. BACKGROUND

[0002] The point fertilization device is used in precision agriculture, and is used for point and quantitative fertilization operation between crop planting rows. The design purpose of the device is to improve the fertilizer use efficiency, reduce waste, promote uniform growth of crops, and improve yield and quality. However, the current point fertilization device has low working efficiency and cannot simultaneously fertilize double-row plants. SUMMARY

[0003] The present application aims to provide an intermittent double-row point fertilization device to solve the technical problem that the existing point fertilization device is not suitable for double-row plant fertilization.

[0004] To solve the above technical problems, the present application adopts the following technical scheme:

[0005] The intermittent double-row point fertilization device comprises a fertilizer cavity shell and a gear box, the double-row point fertilization assembly is arranged in the fertilizer cavity shell, the double-row point fertilization assembly comprises a pipe body one and a pipe body two, the pipe body two is inserted into the pipe body one, and the two ends of the pipe body two respectively pass out from the two ends of the pipe body one, the two ends of the pipe body one are respectively provided with a first rotating wheel and a first gear, the two ends of the pipe body two are respectively provided with a second rotating wheel and a second gear, the first rotating wheel and the second rotating wheel are arranged side by side in the fertilizer cavity shell, and the first gear and the second gear are arranged side by side in the gear box.

[0006] The outer edge surface of the first rotating wheel is uniformly provided with four first blade plates, the outer edge surface of the second rotating wheel is uniformly provided with four second blade plates, the first blade plates and the second blade plates are arranged one by one in correspondence, and the first blade plate and the corresponding second blade plate are located in the same plane.

[0007] The power shaft and two rotating shafts are rotatably installed on the gear box, the dial plate is installed on the power shaft, the dial plate is provided with a column pin, the groove wheel and the transmission gear are arranged on each rotating shaft, the dial plate and the two groove wheels are combined to form a groove wheel mechanism, and the transmission gears on the two rotating shafts are respectively engaged with the first gear and the second gear.

[0008] The first rotating wheel end face or the second rotating wheel end face is fixed with a circular partition plate, the circular partition plate is located between the first rotating wheel and the second rotating wheel, the circular partition plate divides the inner cavity of the fertilizer cavity shell into two chambers, the fertilizer cavity shell is provided with a fertilizer inlet at the top, the fertilizer inlet has two fertilizer inlet channels, the two fertilizer inlet channels correspond to the two chambers respectively, and the fertilizer cavity shell is connected with two fertilizer discharge pipes at the bottom, and the two fertilizer discharge pipes correspond to the two chambers respectively.

[0009] Further, the intermittent double-row point fertilizing device further comprises a blade radial telescoping mechanism, the blade radial telescoping mechanism comprises a locking member, a blade adjusting shaft and two groups of radial adjusting members, the blade adjusting shaft is inserted from the end of the second pipe body, and the blade adjusting shaft and the second rotating wheel are located at the same end of the second pipe body, and the locking member is used for limiting the movement of the blade adjusting shaft in the axial direction of the second pipe body.

[0010] The radial adjusting member comprises a mounting sleeve, four rectangular plates are uniformly distributed on the outer wall of the mounting sleeve, the rectangular plates are arranged in the radial direction of the mounting sleeve, and an inclined hole is formed in the rectangular plate.

[0011] One group of radial adjusting members is sleeved on the blade adjusting shaft, and the mounting sleeve of the radial adjusting member is fixedly connected with the blade adjusting shaft, and the other group of radial adjusting members is sleeved on the second pipe body, two long holes are formed in the second pipe body, the two long holes are symmetrically arranged about the axis of the second pipe body, the mounting sleeve of the radial adjusting member is located in the long hole section of the second pipe body, and the mounting sleeve can move on the second pipe body, two limiting pins are fixed on the blade adjusting shaft and penetrate through the blade adjusting shaft, the two ends of the two limiting pins are respectively arranged in the two long holes, and the mounting sleeve on the second pipe body is limited between the two limiting pins.

[0012] Four slots are formed in the first rotating wheel and the second rotating wheel, four first blade plates are arranged in the four slots of the first rotating wheel, the first blade plates can move in the radial direction of the first rotating wheel in the slots, and four second blade plates are arranged in the four slots of the second rotating wheel, and the second blade plates can move in the radial direction of the second rotating wheel in the slots.

[0013] A central slot is formed in the center of the first rotating wheel and the second rotating wheel, the two groups of radial adjusting members are respectively arranged in the central slots of the first rotating wheel and the second rotating wheel, the slots extend to the central slots, the ends of the four first blade plates are respectively connected to the radial adjusting members on the second pipe body, and the ends of the four second blade plates are respectively connected to the radial adjusting members on the blade adjusting shaft.

[0014] The four first blade plates correspond to the four rectangular plates of the radial adjusting member respectively, the end of the first blade plate is fixedly provided with a first sliding pin, and the first sliding pin at the end of the first blade plate is located in the inclined hole in the corresponding rectangular plate.

[0015] The four second blade plates correspond to the four rectangular plates of the radial adjusting member respectively, the end of the second blade plate is fixedly provided with a second sliding pin, and the second sliding pin at the end of the second blade plate is located in the inclined hole in the corresponding rectangular plate.

[0016] Further, the front side of the fertilizer cavity shell is provided with a front cover, the end of the blade adjusting shaft penetrates outwards from the front cover, and the end of the blade adjusting shaft is provided with a plurality of annular grooves.

[0017] The locking piece is a locking sheet, which is hingedly installed on the front cover through a pin shaft, and can be placed in one of the annular grooves.

[0018] Compared with the prior art, the intermittent double-row point fertilizer application device has the advantages that the intermittent double-row point fertilizer application device is connected with the fertilizer distributor through the fertilizer inlet at the top, and then the fertilizer is guided to fall into the fertilizer groove through the fertilizer discharge pipe; the intermittent fertilizer discharge working principle of the double-row point fertilizer application assembly in the fertilizer cavity shell is that the fertilizer falls into two chambers, the continuous rotation of the motor is converted into intermittent motion through the two sets of groove wheel mechanisms, the first gear and the second gear rotate alternately, and the first gear and the second gear rotate by 90° each time, the first gear and the second gear rotate to realize fertilizer discharge, and finally intermittent and alternate fertilization is realized, the overall structure design is reasonable, intermittent fertilization is simultaneously performed on double-row plants, the efficiency is high, and the fertilizer utilization rate is high. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and explain the technical scheme of the present application, and do not constitute a limitation on the present application. In the drawings:

[0020] Figure 1 It is a structural schematic view of the intermittent double-row point fertilizer application device of the present application;

[0021] Figure 2 It is a connection schematic view of the gear box and the double-row point fertilizer application assembly;

[0022] Figure 3 It is an exploded view of Figure 2 ;

[0023] Figure 4 It is an exploded view of the blade radial telescopic mechanism and the double-row point fertilizer application assembly;

[0024] Figure 5 It is a connection schematic view of the blade radial telescopic mechanism and the double-row point fertilizer application assembly;

[0025] Figure 6 It is a structural schematic view of the blade adjusting shaft;

[0026] Figure 7 It is a structural schematic view of the first blade plate and the second blade plate respectively installed on the first rotating wheel and the second rotating wheel. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

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

[0029] A specific embodiment of the intermittent double-row point fertilization device provided by the present invention:

[0030] like Figures 1-3 As shown, the intermittent dual-row point fertilization device includes a fertilizer chamber shell 1 and a gearbox 2. The fertilizer chamber shell 1 is equipped with a dual-row point fertilization assembly, which includes a tube body 3 and a tube body 4. The tube body 4 is inserted into the tube body 3, and the two ends of the tube body 4 extend outward from the two ends of the tube body 3 respectively. The two ends of the tube body 3 are respectively equipped with a first rotating wheel 5 and a first gear 6. The two ends of the tube body 4 are respectively equipped with a second rotating wheel 7 and a second gear 8. The first rotating wheel 5 and the second rotating wheel 7 are located side by side in the fertilizer chamber shell 1, and the first gear 6 and the second gear 8 are located side by side in the gearbox 2.

[0031] The outer edge surface of the first rotating wheel 5 is uniformly provided with four first blade plates 9, and the outer edge surface of the second rotating wheel 7 is uniformly provided with four second blade plates 10. The first blade plates 9 and the second blade plates 10 are arranged in a one-to-one correspondence, and the first blade plates 9 and the corresponding second blade plates 10 are located on the same plane.

[0032] A power shaft 11 and two rotating shafts 12 are rotatably mounted on the gearbox 2. A dial 13 is mounted on the power shaft 11, and a pin 14 is provided on the dial 13. Each rotating shaft 12 is provided with a grooved wheel 15 and a transmission gear 16. The dial 13 is combined with the two grooved wheels 15 to form a grooved wheel mechanism. The transmission gears 16 on the two rotating shafts 12 mesh with the first gear 6 and the second gear 8, respectively.

[0033] A circular partition plate 17 is fixed on the end face of the first rotating wheel 5 or the end face of the second rotating wheel 7. The circular partition plate 17 is located between the first rotating wheel 5 and the second rotating wheel 7. The circular partition plate 17 divides the inner cavity of the fertilizer chamber housing 1 into two chambers. A fertilizer inlet port 18 is provided on the top of the fertilizer chamber housing 1. The fertilizer inlet port 18 has two fertilizer inlet channels, which correspond to the two chambers respectively. Two fertilizer discharge pipes 19 are connected to the bottom of the fertilizer chamber housing 1, which correspond to the two chambers respectively.

[0034] In this embodiment, the intermittent double-row point fertilization device is used such that the fertilizer inlet 18 at the top is connected to a fertilizer discharger (such as an external grooved wheel fertilizer discharger). The amount of fertilizer entering the fertilizer inlet 18 is controlled by the operation of the fertilizer discharger, and then the fertilizer is guided by the fertilizer discharge pipe 19 to fall into the fertilizer ditch. The intermittent double-row point fertilization device of this invention should be installed as close to the ground as possible to reduce the intermittent fertilizer flow time and reduce the dispersion of fertilizer. The intermittent fertilizer discharge process of the double-row point fertilization component in the fertilizer chamber housing 1 is as follows: fertilizer falls into two chambers, the power shaft 11 of the gearbox 2 is connected to the motor main shaft, and the continuous rotation of the motor is converted into intermittent motion through two sets of grooved wheel mechanisms, so that the first gear 6 and the second gear 7... The two gears 8 rotate alternately, and the first gear 6 and the second gear 8 rotate 90° each time. For example, when the first gear 6 is stationary, the second gear 8 rotates 90° under the drive. The second gear 8 drives the second rotating wheel 7 to rotate 90° through the tube body 2 4. Under the action of the second blade plate 10 on the outer edge of the second rotating wheel 7, fertilizer falls into one of the fertilizer discharge pipes 19, and fertilizer is applied by this fertilizer discharge pipe 19, while the other fertilizer discharge pipe 19 does not discharge fertilizer. Then the first gear 6 starts to rotate, and the second gear 8 does not move. Through the action of the first blade plate 9, the fertilizer in the corresponding fertilizer chamber falls into the other fertilizer discharge pipe 19, and falls into the fertilizer ditch along the fertilizer discharge pipe 19, finally realizing intermittent alternating fertilization.

[0035] Furthermore, fertilizer continuously falls into the fertilizer chamber. As the first rotating wheel 5 and the second rotating wheel 7 rotate, the first blade plate 9 and the second blade plate 10 may crush the fertilizer falling near the fertilizer inlet channel during rotation. To solve the above problem, the intermittent double-row point fertilization device of the above embodiment can be further optimized. Specifically, a blade radial extension mechanism is provided to adjust the length of the first blade plate 9 and the second blade plate 10 protruding beyond the outer edges of the first rotating wheel 5 and the second rotating wheel 7, such as... Figures 4-7 As shown, the blade radial telescopic mechanism includes a locking member, a blade adjusting shaft 20, and two sets of radial adjusting members 21. The blade adjusting shaft 20 is inserted from the end of the tube body 4, and the blade adjusting shaft 20 and the second rotating wheel 7 are located at the same end of the tube body 4. The locking member is used to restrict the movement of the blade adjusting shaft 20 in the axial direction of the tube body 4.

[0036] The radial adjustment component 21 includes a mounting sleeve 22. Four rectangular plates 23 are evenly distributed on the outer wall of the mounting sleeve 22. The rectangular plates 23 are arranged along the radial direction of the mounting sleeve 22, and oblique holes 24 are provided on the rectangular plates 23.

[0037] One set of radial adjusting components 21 is fitted onto the blade adjusting shaft 20, and the mounting sleeve 22 of the radial adjusting component 21 is integrally set onto the blade adjusting shaft 20 (e.g., Figure 6As shown in the figure, one set of radial adjusting members 21 is sleeved on the pipe body two 4, and the pipe body two 4 is provided with two long holes 25 which are symmetrically arranged about the axis of the pipe body two 4. The mounting sleeve 22 of the radial adjusting member 21 is located in the long hole 25 of the pipe body two 4, and the mounting sleeve 22 is movable on the pipe body two 4. Two limiting pins 26 are fixed on the blade adjusting shaft 20 and pass through the blade adjusting shaft 20. The two ends of the two limiting pins 26 are respectively arranged in the two long holes 25, and the mounting sleeve 22 of the pipe body two 4 is limited between the two limiting pins 26.

[0038] As shown in the figure, the first runner 5 and the second runner 7 are each provided with four slots 27. The four first blade plates 9 are arranged in the four slots 27 of the first runner 5, and the first blade plates 9 are movable in the radial direction of the first runner 5. The four second blade plates 10 are arranged in the four slots 27 of the second runner 7, and the second blade plates 10 are movable in the radial direction of the second runner 7. Figure 7 As shown in the figure, the first runner 5 and the second runner 7 are each provided with a central slot 28. The two sets of radial adjusting members 21 are respectively arranged in the central slots 28 of the first runner 5 and the second runner 7. The slots 27 extend to the central slots 28. The ends of the four first blade plates 9 are respectively connected to the radial adjusting members 21 on the pipe body two 4. The ends of the four second blade plates 10 are respectively connected to the radial adjusting members 21 on the blade adjusting shaft 20.

[0039] Figure 5 The four first blade plates 9 respectively correspond to the four rectangular plates 23 of the radial adjusting members 21. The ends of the first blade plates 9 are fixed with first sliding pins 29, and the first sliding pins 29 at the ends of the first blade plates 9 are arranged in the inclined holes 24 on the corresponding rectangular plates 23.

[0040] The four second blade plates 10 respectively correspond to the four rectangular plates 23 of the radial adjusting members 21. The ends of the second blade plates 10 are fixed with second sliding pins 30, and the second sliding pins 30 at the ends of the second blade plates 10 are arranged in the inclined holes 24 on the corresponding rectangular plates 23.

[0041] When the blade adjusting shaft 20 moves in the axial direction of the pipe body two 4, the blade adjusting shaft 20 drives the radial adjusting members 21 on the pipe body two 4 to move, and the moving range is the length of the long hole 25. When the pipe body one 3 rotates to drive the first runner 5 to rotate, the first runner 5 drives the radial adjusting members 21 in the central slot 28 of the first runner 5 to rotate. The radial adjusting members 21 are sleeved on the pipe body two 4, and the radial adjusting members 21 rotate on the pipe body two 4 and cannot drive the pipe body two 4 to rotate. Therefore, when the first runner 5 rotates, it does not affect the second runner 7, and the two are independent of each other.

[0042] When the blade adjusting shaft 20 moves in the axial direction of the pipe body two 4, the blade adjusting shaft 20 drives the radial adjusting members 21 on the pipe body two 4 to move, and the moving range is the length of the long hole 25. When the pipe body one 3 rotates to drive the first runner 5 to rotate, the first runner 5 drives the radial adjusting members 21 in the central slot 28 of the first runner 5 to rotate. The radial adjusting members 21 are sleeved on the pipe body two 4, and the radial adjusting members 21 rotate on the pipe body two 4 and cannot drive the pipe body two 4 to rotate. Therefore, when the first runner 5 rotates, it does not affect the second runner 7, and the two are independent of each other. ​

[0043] When adjusting the first vane plate 9 and the second vane plate 10, the vane adjusting shaft 20 is moved along the length direction of the pipe body two 4, the vane adjusting shaft 20 pulls the two groups of radial adjusting members 21 to move, and the first vane plate 9 and the second vane plate 10 are both limited in the slot 27, so that the first vane plate 9 and the second vane plate 10 are relatively moved with the corresponding radial adjusting members 21, the first vane plate 9 slides in the inclined hole 24 of the rectangular plate 23 through the first sliding pin 29, the second vane plate 10 slides in the inclined hole 24 of the rectangular plate 23 through the second sliding pin 30, and finally the first vane plate 9 and the second vane plate 10 are respectively moved along the radial direction of the first runner 5 and the second runner 7, the length of the first vane plate 9 and the second vane plate 10 protruding from the outer edge of the first runner 5 and the second runner 7 is changed, the fertilizer falling into the nearby fertilizer channel is avoided from being crushed, and the user can adjust according to the size of the fertilizer.

[0044] As shown in Figure 1 and Figure 6 In order to realize the limiting of the vane adjusting shaft 20 in the axial direction of the pipe body two 4 by the locking piece, the front side of the fertilizer cavity shell 1 is provided with a front cover 31, the end of the vane adjusting shaft 20 is outwardly penetrated from the front cover 31, and the end of the vane adjusting shaft 20 is provided with a plurality of annular grooves 32.

[0045] The locking piece is a locking sheet 33, the locking sheet 33 is hingedly installed on the front cover 31 through a pin shaft, the locking sheet 33 can be placed in one of the annular grooves 32, the locking sheet 33 is pulled out from the annular groove 32 by rotating the locking sheet 33 around the pin shaft, the locking sheet 33 no longer limits the vane adjusting shaft 20, at this time the vane adjusting shaft 20 can be pushed and pulled, and after the adjustment is completed, the locking sheet 33 is rotated into the corresponding annular groove 32.

[0046] It should be noted that in this document, such as the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or equipment.

[0047] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An intermittent twin-row point applicator characterized by: The application relates to a double-row point fertilizer application device, which comprises a fertilizer cavity shell and a gear box, a double-row point fertilizer application device is arranged in the fertilizer cavity shell, the double-row point fertilizer application device comprises a first pipe body and a second pipe body, the second pipe body is inserted into the first pipe body, two ends of the second pipe body are respectively outwardly arranged from two ends of the first pipe body, two ends of the first pipe body are respectively provided with a first rotating wheel and a first gear, two ends of the second pipe body are respectively provided with a second rotating wheel and a second gear, the first rotating wheel and the second rotating wheel are arranged side by side in the fertilizer cavity shell, and the first gear and the second gear are arranged side by side in the gear box. Four first blade plates are uniformly arranged on the outer edge surface of the first rotating wheel, four second blade plates are uniformly arranged on the outer edge surface of the second rotating wheel, the first blade plates and the second blade plates are arranged in one-to-one correspondence, and the first blade plate and the corresponding second blade plate are located on the same plane. A power shaft and two rotating shafts are rotatably arranged on the gear box, a dial plate is arranged on the power shaft, the dial plate is provided with a column pin, a groove wheel and a transmission gear are arranged on each rotating shaft, the dial plate and the two groove wheels are combined to form a groove wheel mechanism, and the transmission gears on the two rotating shafts are respectively meshed with the first gear and the second gear. A circular partition plate is fixed to the end surface of the first rotating wheel or the end surface of the second rotating wheel, the circular partition plate is located between the first rotating wheel and the second rotating wheel, the circular partition plate divides the inner cavity of the fertilizer cavity shell into two chambers, a fertilizer inlet is arranged at the top of the fertilizer cavity shell, the fertilizer inlet is provided with two fertilizer inlet channels, the two fertilizer inlet channels correspond to the two chambers respectively, and two fertilizer discharge pipes are connected to the bottom of the fertilizer cavity shell and correspond to the two chambers respectively.

2. The intermittent twin-row point applicator of claim 1, wherein: The application further relates to a blade radial telescopic mechanism, which comprises a locking piece, a blade adjusting shaft and two groups of radial adjusting pieces, the blade adjusting shaft is inserted into the end of the second pipe body, and the blade adjusting shaft and the second rotating wheel are located at the same end of the second pipe body. The radial adjusting piece comprises a mounting sleeve, four rectangular plates are uniformly arranged on the outer wall of the mounting sleeve, the rectangular plates are arranged along the radial direction of the mounting sleeve, and an inclined hole is formed in the rectangular plate. One group of radial adjusting pieces is sleeved on the blade adjusting shaft, and the mounting sleeve of the radial adjusting piece is fixedly connected with the blade adjusting shaft, the other group of radial adjusting pieces is sleeved on the second pipe body, two long holes are formed in the second pipe body, the two long holes are symmetrically arranged about the axis of the second pipe body, the mounting sleeve of the radial adjusting piece is located in the long hole section of the second pipe body, and the mounting sleeve can move on the second pipe body, two limiting pins are fixedly arranged on the blade adjusting shaft and penetrate through the blade adjusting shaft, and the two ends of the two limiting pins are respectively arranged in the two long holes, and the mounting sleeve on the second pipe body is limited between the two limiting pins. Four slots are formed in the first rotating wheel and the second rotating wheel, the four first blade plates are arranged in the four slots of the first rotating wheel, the first blade plates can move in the radial direction of the first rotating wheel in the slots, the four second blade plates are arranged in the four slots of the second rotating wheel, and the second blade plates can move in the radial direction of the second rotating wheel in the slots. The center of the first rotating wheel and the second rotating wheel is provided with a center groove, the two groups of radial adjusting members are respectively located in the center groove of the first rotating wheel and the second rotating wheel, the slot extends to the center groove, the end of the four first blade plates is respectively connected to the radial adjusting member on the pipe body two, the end of the four second blade plates is respectively connected to the radial adjusting member on the blade adjusting shaft; The four first blade plates correspond to the four rectangular plates of the radial adjusting member respectively, the end of the first blade plate is fixed with a first sliding pin, the first sliding pin at the end of the first blade plate is located in the inclined hole on the corresponding rectangular plate; The four second blade plates correspond to the four rectangular plates of the radial adjusting member respectively, the end of the second blade plate is fixed with a second sliding pin, the second sliding pin at the end of the second blade plate is located in the inclined hole on the corresponding rectangular plate.

3. The intermittent twin-line point applicator of claim 2, wherein: The front side of the fat cavity shell is provided with a front cover, the end of the blade adjusting shaft is outwardly out of the front cover, and the end of the blade adjusting shaft is provided with a plurality of annular grooves; The locking member is a locking sheet, the locking sheet is hingedly installed on the front cover through a pin shaft, and the locking sheet can be placed in one of the annular grooves.

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