Surveying and mapping geographic information data acquisition tool

Abstract

The invention relates to the technical field of geographic information collection, and discloses a surveying and mapping geographic information data collection tool which comprises a supporting seat, two sliding cavities are formed in the right side of the supporting seat, fixing nails are slidably connected into the sliding cavities, connecting arms are fixedly connected to the right sides of the two fixing nails, and two sliding grooves are formed in the left side of the supporting seat. A side gear drives a threaded rod to rotate so as to drive a threaded sleeve to move downwards, meanwhile, a long gear drives a rotating gear to rotate, and the rotating gear drives a quick release rod and a bottom rod to rotate through a rotating joint, so that a drilling plate rotates while moving downwards, and when the drilling plate makes contact with soil, the soil is smashed and slowly goes deep into the ground; in the process, soft soil broken by the drilling plate can enter the cylinder, so that the probe is not damaged when making contact with the soil, and the problem that the probe inserted into the soil is prone to damage due to the fact that the soil is hard in the prior art is solved.

Description

Technical Field

[0001] This application relates to the technical field of geographic information collection, and particularly to a tool for collecting surveying and mapping geographic information data. Background Art

[0002] Geographic information refers to the geographic meaning extracted from geographic data, covering the quantity, quality, characteristics, distribution characteristics, interrelationships and laws of substances related to geographical environmental elements, and is presented in various forms such as numbers, texts, images and graphics. Surveying work mainly measures natural geographical elements or facilities built on the ground surface, determines their shapes, sizes, spatial positions and their attributes, and draws these information into maps. During the process of surveying and mapping geographic information data, in order to collect geographic information data such as the relevant attributes of soil, it is also necessary to collect soil information. This requires the use of specific collection tools to complete this task.

[0003] In the prior art, there are still the following problems in the process of collecting soil data. First, when collecting soil data, it is often necessary to insert the probe of a soil temperature and humidity detector or the probe of an acid-base detector into the soil for detection. Since the soil is relatively hard, the probe is easily damaged when inserted into the soil. Second, when it is necessary to detect deep soil, it is necessary to dig out the soil through tools, and then insert the detection probe into the soil for detection. The detection is very cumbersome, and it is impossible to accurately detect the soil at different depths. Moreover, it is impossible to accurately take quick samples of the soil. Summary of the Invention

[0004] This application proposes a tool for collecting surveying and mapping geographic information data, which has the advantages of preventing probe damage and accurate sampling, and is used to solve the problems that the probe inserted into the soil is easily damaged and it is impossible to sample the soil at different depths more accurately.

[0005] To achieve the above object, this application adopts the following technical solution: A tool for collecting surveying and mapping geographic information data, including a support base, two sliding cavities are opened on the right side of the support base, a fixing nail is slidably connected inside the sliding cavity, the right sides of the two fixing nails are fixedly connected with a connecting arm, two sliding grooves are opened on the left side of the support base, two sliding plates are slidably connected inside the two sliding grooves, and a threaded sleeve is fixedly connected between the two sliding plates; A driving mechanism, the driving mechanism is arranged on the left side of the support base; A bottom rod, the upper end of the bottom rod is clamped with a quick-release rod, and a fixing sleeve, a mounting plate and a drilling plate are fixedly connected to the curved surface of the bottom rod. A depth sensor and a plurality of probes are fixedly connected inside the mounting plate; Sampling mechanism, the sampling mechanism is arranged at the edge of the mounting plate. The sampling mechanism includes a cylinder body. A plurality of arc-shaped grooves arranged equidistantly in a circle are formed on the curved surface of the cylinder body. A sliding block is slidably connected inside the arc-shaped groove. An electromagnet and a long plate are fixedly connected to the outside of the sliding block. Partition plates are fixedly connected to both the upper and lower ends of the long plate. A plurality of rectangular plates arranged equidistantly in a circle are fixedly connected to the curved surface of the cylinder body. A connecting plate is arranged between two adjacent rectangular plates. A movable plate is rotatably installed at the outer end of the connecting plate. A permanent magnet is fixedly installed on one side of the connecting plate close to the electromagnet. An arc-shaped plate is arranged outside the long plate. The above structure can, during operation, energize the electromagnet to generate a magnetic field that attracts the permanent magnet, so that the electromagnet, the long plate, and the partition plates move towards the permanent magnet until the spaces formed by the movable plate and the cylinder body are sealed by the upper and lower partition plates, thereby completing the detection or sampling at the target depth. And a gap will be generated between the long plate and the rectangular plate that it first contacts. During the downward or upward movement, the soil will pass through the gap between the two, thereby reducing the resistance of the soil.

[0006] Preferably, the driving mechanism includes a driving motor and two threaded rods. The output shaft of the driving motor is fixedly connected to a transmission shaft. An upper gear is fixedly connected to the upper end of the transmission shaft. Side gears are meshed on both the front and rear sides of the upper gear. The side gears are fixedly connected to the tops of the threaded rods. A long gear is fixedly connected to the middle of the transmission shaft. A rotating gear is meshed on the left side of the long gear. A rotating joint is fixedly connected to the middle of the rotating gear; The above structure can, during operation, make the driving motor work to drive the transmission shaft to rotate. The transmission shaft will drive the upper gear and the long gear to rotate. The upper gear will drive the side gears to rotate. The side gears will drive the threaded rods to rotate, thereby driving the threaded sleeve to move downward. At the same time, the long gear will drive the rotating gear to rotate. The rotating gear will drive the quick-release rod and the bottom rod to rotate through the rotating joint, which makes the drilling plate and the sampling mechanism move downward and rotate at the same time.

[0007] Preferably, the two sliding plates are symmetrically arranged up and down. The fixed sleeve is located above the mounting plate. The mounting plate is located above the drilling plate.

[0008] Preferably, the driving motor is fixedly connected to the support seat. The upper and lower ends of the threaded rod are rotatably connected to the support seat. The upper and lower ends of the transmission shaft are rotatably connected to the support seat.

[0009] Preferably, the threaded rod is threadedly connected to the threaded sleeve. The two threaded rods are symmetrically arranged. The above structure can, during operation, make the upper gear drive the side gears to rotate. The side gears will drive the threaded rods to rotate, thereby driving the threaded sleeve to move downward, and further making the sliding plate move downward along the sliding groove.

[0010] Preferably, the rotary joint is rotatably connected to the sliding plate. The lower end of the rotary joint protrudes from the lower sliding plate, and the lower end of the rotary joint is clamped with the upper end of the quick-release rod. When the upper end of the quick-release rod is flush with the ground during operation, the connection between the lower end of the rotary joint and the upper end of the quick-release rod can be disconnected, and the rotary joint can be reset upward to its initial position. Then, a new quick-release rod can be taken out and connected to the rotary joint and the quick-release rod in the soil, so that the sampling mechanism can move deeper into the soil.

[0011] Preferably, the inner wall of the cylinder is fixedly connected to both the fixed sleeve and the drilling plate. The mounting plate is located in the middle of the cylinder. This structure can prevent the probe and the depth sensor from being damaged during operation. Secondly, it can ensure the accuracy of the depth detection by the depth sensor.

[0012] Preferably, the partition plate is in contact with the connecting plate. The electromagnet is fixedly connected to the long plate. The side of the long plate away from the electromagnet is in contact with the rectangular plate. The arc plate is fixedly connected to both the connecting plate and the rectangular plate. The movable plate is clamped with the rectangular plate. The connecting plate is fixedly connected to the cylinder. When the electromagnet is energized during operation, it generates a magnetic field that attracts the permanent magnets in the same group, so that the electromagnet, the long plate, and the partition plate move towards the permanent magnets until the upper and lower partition plates seal the space formed by the movable plate and the cylinder.

[0013] Preferably, the lower end of the rectangular plate is inclined, and the bottom end of the cylinder is provided with a chamfer. When the rectangular plate moves downward and rotates while contacting the soil during operation, it will crush the soil and slowly penetrate into the ground. During this process, the loose soil broken by the rectangular plate will enter the space formed by the movable plate and the cylinder and finally be discharged from the top of the movable plate.

[0014] The beneficial effects of the present invention are as follows: 1. By operating the drive motor, the drive shaft is driven to rotate. The drive shaft drives the upper gear and the long gear to rotate. The upper gear drives the side gear to rotate, and the side gear drives the threaded rod to rotate, thereby driving the threaded sleeve to move downward. At the same time, the long gear drives the rotating gear to rotate, and the rotating gear drives the quick-release rod and the bottom rod to rotate through the rotary joint. This makes the drilling plate move downward and rotate at the same time. When the drilling plate contacts the soil, it will crush the soil and slowly penetrate into the ground. During this process, the soft soil broken by the drilling plate will enter the interior of the cylinder, so that the probe contacting the soil will not be damaged, thus solving the problem that the probe inserted into the soil is easily damaged due to hard soil in the prior art.

[0015] 2. When the depth sensor detects that the soil depth reaches the sampling position, the drive motor will stop working. The electromagnet in one of the groups is energized to generate a magnetic field that attracts the permanent magnet in the same group, causing the electromagnet, the long plate, and the partition to move towards the permanent magnet until the partitions above and below seal the space formed by the movable plate and the cylinder body, thus completing the detection or sampling of the target depth. Subsequently, the drive motor can continue to work to sample the soil at deeper depths. During this process, the obtained soil sample will not be contaminated, thereby solving the problem that the existing method cannot accurately sample the soil at different depths, and the obtained samples are easily contaminated by the soil at other depths, further reducing the soil accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings forming a part of the specification illustrate the embodiments disclosed in the present application and, together with the specification, are used to explain the principles of the present application in a clear and understandable manner.

[0017] With reference to the drawings, the present disclosure can be more clearly understood from the following detailed description, wherein: Figure 1 is a schematic diagram of the overall external structure of the present invention; Figure 2 is a schematic diagram of the sliding cavity structure of the present invention; Figure 3 is a schematic diagram of the drive mechanism of the present invention; Figure 4 is a schematic diagram of the sampling mechanism of the present invention; Figure 5 is a schematic diagram of the inside of the cylinder body of the present invention; Figure 6 is a schematic diagram of some components of the sampling mechanism of the present invention separated from each other.

[0018] Wherein: 1. Support base; 2. Sliding cavity; 3. Fixed nail; 4. Connecting arm; 5. Sliding groove; 6. Sliding plate; 7. Threaded sleeve; 8. Drive mechanism; 81. Drive motor; 82. Transmission shaft; 83. Upper gear; 84. Side gear; 85. Threaded rod; 86. Long gear; 87. Rotating gear; 88. Rotating joint; 9. Bottom rod; 10. Quick-release rod; 11. Fixed sleeve; 12. Mounting plate; 13. Drilling plate; 14. Depth sensor; 15. Probe; 16. Sampling mechanism; 161. Cylinder body; 162. Arc-shaped groove; 163. Sliding block; 164. Electromagnet; 165. Long plate; 166. Partition; 167. Rectangular plate; 168. Connecting plate; 169. Movable plate; 1610. Permanent magnet; 1611. Arc-shaped plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0020] Please refer to Figures 1-6 , the present application discloses a surveying and mapping geographic information data collection tool, including a support base 1. Two sliding cavities 2 are opened on the right side of the support base 1. A fixing nail 3 is slidably connected inside the sliding cavity 2. A connecting arm 4 is fixedly connected to the right sides of the two fixing nails 3. Two sliding grooves 5 are opened on the left side of the support base 1. Two sliding plates 6 are slidably connected inside the two sliding grooves 5. A threaded sleeve 7 is fixedly connected between the two sliding plates 6; A driving mechanism 8 is arranged on the left side of the support base 1; A bottom rod 9, the upper end of the bottom rod 9 is clamped with a quick-release rod 10. A fixing sleeve 11, a mounting plate 12, and a drilling plate 13 are fixedly connected to the curved surface of the bottom rod 9. A depth sensor 14 and a plurality of probes 15 are fixedly connected inside the mounting plate 12; A sampling mechanism 16 is arranged on the edge of the mounting plate 12. The sampling mechanism 16 includes a cylinder body 161. A plurality of arc-shaped grooves 162 arranged at equal circumferential intervals are opened on the curved surface of the cylinder body 161. A sliding block 163 is slidably connected inside the arc-shaped groove 162. An electromagnet 164 and a long plate 165 are fixedly connected to the outside of the sliding block 163. Partition plates 166 are fixedly connected to the upper and lower ends of the long plate 165. A plurality of rectangular plates 167 arranged at equal circumferential intervals are fixedly connected to the curved surface of the cylinder body 161. A connecting plate 168 is arranged between two adjacent rectangular plates 167. An activity plate 169 is rotatably installed at the outer end of the connecting plate 168. A permanent magnet 1610 is fixedly installed on the side of the connecting plate 168 close to the electromagnet 164. An arc-shaped plate 1611 is arranged on the outside of the long plate 165; Its function is that when the electromagnet 164 is energized, it generates a magnetic field that attracts the permanent magnet 1610, so that the electromagnet 164, the long plate 165, and the partition plate 166 move towards the permanent magnet 1610 until the partition plates 166 above and below seal the space formed by the activity plate 169 and the cylinder body 161, thereby completing the detection or sampling of the target depth. And a gap will be generated between the long plate 165 and the initially contacted rectangular plate 167. During the downward or upward movement, the soil will pass through the gap between the two, thereby reducing the resistance of the soil.

[0021] Among them, the driving mechanism 8 includes a driving motor 81 and two threaded rods 85. The output shaft of the driving motor 81 is fixedly connected to a transmission shaft 82. The upper end of the transmission shaft 82 is fixedly connected to an upper gear 83. Side gears 84 are meshed on both the front and rear sides of the upper gear 83. The side gears 84 are fixedly connected to the tops of the threaded rods 85. A long gear 86 is fixedly connected to the middle of the transmission shaft 82. A rotating gear 87 is meshed on the left side of the long gear 86. A rotating joint 88 is fixedly connected to the middle of the rotating gear 87; Its function is that when the driving motor 81 works, it drives the transmission shaft 82 to rotate. The transmission shaft 82 will drive the upper gear 83 and the long gear 86 to rotate. The upper gear 83 will drive the side gears 84 to rotate. The side gears 84 will drive the threaded rods 85 to rotate, thereby driving the threaded sleeve 7 to move downward. At the same time, the long gear 86 will drive the rotating gear 87 to rotate. The rotating gear 87 will drive the quick-release rod 10 and the bottom rod 9 to rotate through the rotating joint 88, which makes the drilling plate 13 and the sampling mechanism 16 move downward and rotate at the same time.

[0022] Among them, the two sliding plates 6 are symmetrically arranged up and down. The fixed sleeve 11 is located above the mounting plate 12, and the mounting plate 12 is located above the drilling plate 13.

[0023] Among them, the driving motor 81 is fixedly connected to the support base 1. The upper and lower ends of the threaded rod 85 are rotatably connected to the support base 1. The upper and lower ends of the transmission shaft 82 are rotatably connected to the support base 1.

[0024] Among them, the threaded rod 85 is threadedly connected to the threaded sleeve 7. The two threaded rods 85 are symmetrically arranged. Its function is that the upper gear 83 will drive the side gears 84 to rotate. The side gears 84 will drive the threaded rod 85 to rotate, thereby driving the threaded sleeve 7 to move downward, and further making the sliding plate 6 move downward along the sliding groove 5.

[0025] Among them, the rotating joint 88 is rotatably connected to the sliding plate 6. The lower end of the rotating joint 88 protrudes from the lower sliding plate 6. The lower end of the rotating joint 88 is clamped to the upper end of the quick-release rod 10. Its function is that when the upper end of the quick-release rod 10 is level with the ground, the connection between the lower end of the rotating joint 88 and the upper end of the quick-release rod 10 is disconnected. The rotating joint 88 resets upward to the initial position. Take out a new quick-release rod 10 and connect it to the rotating joint 88 and the quick-release rod 10 in the soil, so that the sampling mechanism 16 moves deeper into the soil.

[0026] Among them, the inner wall of the cylinder 161 is fixedly connected to both the fixed sleeve 11 and the drilling plate 13. The mounting plate 12 is located in the middle of the cylinder 161. Its function is to prevent the probe 15 and the depth sensor 14 from being damaged. Secondly, it ensures the accuracy of the depth detection by the depth sensor 14.

[0027] Among them, the partition plate 166 is in contact with the connecting plate 168, the electromagnet 164 is fixedly connected to the long plate 165, one side of the long plate 165 away from the electromagnet 164 is in contact with the rectangular plate 167, the arc-shaped plate 1611 is fixedly connected to both the connecting plate 168 and the rectangular plate 167, the movable plate 169 is clamped with the rectangular plate 167, and the connecting plate 168 is fixedly connected to the cylinder body 161; Its function is that when the depth sensor 14 detects that the soil depth reaches the sampling position, the drive motor 81 will stop working. The electromagnet 164 in one group is energized to generate a magnetic field that attracts the permanent magnet 1610 in the same group, so that the electromagnet 164, the long plate 165, and the partition plate 166 move towards the permanent magnet 1610 until the partition plates 166 above and below seal the space formed by the movable plate 169 and the cylinder body 161, thus completing the detection or sampling of the target depth. Subsequently, the drive motor 81 can continue to work to sample the soil at deeper depths. During the process, the obtained soil sample will not be contaminated, thus solving the problem that the existing method cannot accurately sample the soil at different depths, and the obtained samples are easily contaminated by the soil at other depths, further reducing the soil accuracy.

[0028] Among them, the lower end of the rectangular plate 167 is inclined, and the bottom end of the cylinder body 161 is provided with a chamfer. Its function is that when the rectangular plate 167 moves downward and rotates while contacting the soil, it will crush the soil and slowly penetrate into the ground. During the process, the loose soil crushed by the rectangular plate 167 will enter the space formed by the movable plate 169 and the cylinder body 161 and finally be discharged from the top of the movable plate 169.

[0029] Working principle: Place the support base 1 on the ground, press down the connecting arm 4, which will drive the fixing nail 3 to penetrate into the ground to complete the fixation. Subsequently, the drive motor 81 works to drive the transmission shaft 82 to rotate. The transmission shaft 82 will drive the upper gear 83 and the long gear 86 to rotate. The upper gear 83 will drive the side gear 84 to rotate, and the side gear 84 will drive the threaded rod 85 to rotate, thereby driving the threaded sleeve 7 to move downward. At the same time, the long gear 86 will drive the rotating gear 87 to rotate, and the rotating gear 87 will drive the quick-release rod 10 and the bottom rod 9 to rotate through the rotating joint 88, which makes the drill plate 13 and the sampling mechanism 16 move downward and rotate at the same time. When the drill plate 13 and the rectangular plate 167 contact the soil, they will crush the soil and slowly penetrate into the ground. During the process, the soft soil crushed by the drill plate 13 will enter the interior of the cylinder body 161, so that the probe 15 will not be damaged when contacting the soil and will finally be discharged from the top of the cylinder body 161, while the loose soil crushed by the rectangular plate 167 will enter the space formed by the movable plate 169 and the cylinder body 161 and finally be discharged from the top of the movable plate 169; When the depth sensor 14 detects that the soil depth reaches the target detection position or sampling position, the drive motor 81 will stop working, enabling the probe 15 to detect the soil at the target depth; or the electromagnet 164 is energized to generate a magnetic field that attracts the permanent magnet 1610, causing the electromagnet 164, the long plate 165, and the partition 166 to move towards the permanent magnet 1610 until the upper and lower partitions 166 seal the space formed by the movable plate 169 and the cylinder 161, thus completing the detection or sampling at the target depth.

[0030] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A surveying and mapping geographic information data collection tool, comprising: A support seat (1), wherein two sliding cavities (2) are provided on the right side of the support seat (1), a fixing pin (3) is slidably connected inside the sliding cavity (2), and a connecting arm (4) is fixedly connected to the right side of the two fixing pins (3), and the support seat (1) is characterized in that two sliding grooves (5) are provided on the left side, two sliding plates (6) are slidably connected inside the two sliding grooves (5), and a threaded sleeve (7) is fixedly connected between the two sliding plates (6); A driving mechanism (8), wherein the driving mechanism (8) is arranged on the left side of the support seat (1); A bottom rod (9), the upper end of the bottom rod (9) being clamped with a quick-release rod (10), the curved surface of the bottom rod (9) being fixedly connected with a fixing sleeve (11), a mounting plate (12), and a drilling plate (13), and the interior of the mounting plate (12) being fixedly connected with a depth sensor (14) and a plurality of probes (15); A sampling mechanism (16), the sampling mechanism (16) being arranged at the edge of the mounting plate (12), the sampling mechanism (16) comprising a cylinder (161), the curved surface of the cylinder (161) being provided with a plurality of arc-shaped grooves (162) arranged equidistantly around the circumference, the interior of the arc-shaped groove (162) being slidably connected to a sliding block (163), the outer side of the sliding block (163) being fixedly connected to an electromagnet (164) and a long plate (165), the upper and lower ends of the long plate (165) being fixedly connected to the outer side of the sliding block (163), and the upper and lower ends of the long plate (165) being fixedly connected to the inner side of the sliding block (163). A partition plate (166) is connected, a plurality of rectangular plates (167) arranged equidistantly around the circumference are fixedly connected to the curved surface of the cylinder (161), a connecting plate (168) is arranged between two adjacent rectangular plates (167), a movable plate (169) is rotatably mounted on the outer end of the connecting plate (168), a permanent magnet (1610) is fixedly mounted on one side of the connecting plate (168) close to the electromagnet (164), and an arc-shaped plate (1611) is arranged on the outer side of the long plate (165).

2. A surveying and mapping geographic information data collection tool according to claim 1, characterized in that: The driving mechanism (8) comprises a driving motor (81) and two threaded rods (85); the output shaft of the driving motor (81) is fixedly connected to a transmission shaft (82); the upper end of the transmission shaft (82) is fixedly connected to an upper gear (83); the front and rear sides of the upper gear (83) are both meshed with side gears (84); the side gears (84) are fixedly connected to the top ends of the threaded rods (85); the middle part of the transmission shaft (82) is fixedly connected to a long gear (86); the left side of the long gear (86) is meshed with a rotating gear (87); the middle part of the rotating gear (87) is fixedly connected to a rotating joint (88).

3. A surveying and mapping geographic information data collection tool according to claim 2, characterized in that: The two sliding plates (6) are symmetrically arranged up and down, the fixing sleeve (11) is located above the mounting plate (12), and the mounting plate (12) is located above the drilling plate (13).

4. A surveying and mapping geographic information data collection tool according to claim 3, characterized in that: The driving motor (81) is fixedly connected to the support seat (1), the upper and lower ends of the threaded rod (85) are rotatably connected to the support seat (1), and the upper and lower ends of the transmission shaft (82) are rotatably connected to the support seat (1).

5. A surveying and mapping geographic information data collection tool according to claim 4, characterized in that: The threaded rod (85) is threadedly connected to the threaded sleeve (7), and the two threaded rods (85) are symmetrically arranged.

6. A surveying and mapping geographic information data collection tool according to claim 5, characterized in that: The rotating joint (88) is rotatably connected to the sliding plate (6), the lower end of the rotating joint (88) is exposed from the lower sliding plate (6), and the lower end of the rotating joint (88) is clamped with the upper end of the quick-release rod (10).

7. A surveying and mapping geographic information data collection tool according to claim 6, characterized in that: The inner wall of the cylinder (161) is fixedly connected to the fixing sleeve (11) and the drilling plate (13), and the mounting plate (12) is located in the middle of the cylinder (161).

8. A surveying and mapping geographic information data collection tool according to claim 7, characterized in that: The partition plate (166) is in contact with the connecting plate (168), the electromagnet (164) is fixedly connected to the long plate (165), the side of the long plate (165) away from the electromagnet (164) is in contact with the rectangular plate (167), the arc plate (1611) is fixedly connected to the connecting plate (168) and the rectangular plate (167), the movable plate (169) is clamped with the rectangular plate (167), and the connecting plate (168) is fixedly connected to the cylinder (161).

9. A surveying and mapping geographic information data collection tool according to claim 8, characterized in that: The lower end of the rectangular plate (167) is inclined, and the bottom end of the cylinder (161) is provided with a chamfer.

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