Civil air defense door frame welding platform

Abstract

The utility model relates to a civil air defense door frame welding platform, and belongs to the technical field of civil air defense door production auxiliary equipment.The civil air defense door frame welding platform comprises a base, supports are slidably arranged on the two opposite sides of the base, the sliding direction of the supports is parallel to the plane where the base is located, and a mounting frame is rotatably arranged between the supports on the two sides; the mounting frame comprises connecting rods rotationally arranged on the support and a supporting rod arranged between the two connecting rods, the rotating axis of the connecting rods is perpendicular to the sliding direction of the support, the ends, away from the support, of the connecting rods are bent, and the supporting rod is arranged at the ends, away from the support, of the two connecting rods. The length of the supporting rod is smaller than the distance between the abutting plates on the two opposite sides of the base, and bristles used for abutting against the surface of the base are arranged on the supporting rod. The device has the beneficial effects that the angle steel placing area on the base can be conveniently cleaned, stable placement of angle steel is not easily affected by impurities, and the welding quality is guaranteed to a certain extent.

Description

Technical Field

[0001] The present application relates to the technical field of auxiliary equipment for the production of civil air defense doors, and in particular to a welding platform for civil air defense door frames. Background Art

[0002] The civil air defense door is mainly composed of a door frame and a door leaf hinged on the door frame. The door frame mainly includes four angle steels welded end to end. During the welding process, the angle steels usually need to be placed on a welding platform for operation.

[0003] In the related art, a Chinese patent document with publication number CN214685020U discloses a welding platform for a civil air defense door frame, including a base, a fixing member for fixing an angle steel is arranged on the base, the fixing member includes an abutment plate slidably arranged on the base for abutting the angle steel, and an electric push rod is arranged on the base for driving the abutment plate to slide; a marking device is arranged on the base, the marking device includes a laser pen slidably arranged on the base, and a curtain is arranged on the side of the base facing the laser pen and away from the laser pen. When in use, the electric push rod is started, and the output shaft of the electric push rod drives the abutment plate to slide, and the sliding of the abutment plate drives the permanent magnet to slide and abut on the angle steel to squeeze and fix the angle steel.

[0004] Regarding the above-mentioned related technologies, during the long-term use of the base, some impurities are usually accumulated on the surface. When the angle steel is placed on the surface of the base for welding, it is easy to cause the angle steel to be unstable, affecting the welding quality. Utility Model Content

[0005] In order to facilitate the cleaning of the area where the angle steel is placed on the base, so that impurities are not easily affected by the stable placement of the angle steel and the welding quality is guaranteed to a certain extent, the present application provides a civil air defense door frame welding platform.

[0006] The civil air defense door frame welding platform provided in this application adopts the following technical solution:

[0007] A civil defense door frame welding platform comprises a base, wherein supports are slidably arranged on opposite sides of the base, the sliding direction of the supports is parallel to the plane where the base is located, and a mounting frame is rotatably arranged between the supports on both sides, and the mounting frame comprises a connecting rod rotatably arranged on the support and a support rod arranged between the two connecting rods, the rotation axis of the connecting rod is perpendicular to the sliding direction of the support, the connecting rod is bent at one end away from the support, the support rod is arranged at one end of the two connecting rods away from the support, the length of the support rod is smaller than the spacing between the abutment plates on the opposite sides of the base, the support rod is provided with bristles for abutting against the surface of the base, the base is provided with a sliding member for driving the support to slide, and the support is provided with a rotating member for driving the connecting rod to rotate.

[0008] By adopting the above technical solution, the two supports are driven by the sliding member to slide synchronously from one end of the base toward the other end of the base, and the supports drive the connecting rod and the support rod to move between the abutment plates on the four sides, which are not easy to interfere with the abutment plates. The connecting rod is driven by the rotating member to drive the support rod to rotate in the direction close to the base, so that the bristles on the support rod abut against the surface of the base, and the two supports are continued to be driven by the sliding member to slide toward the other end of the base, so that the bristles take away impurities on the surface of the base, thereby facilitating the cleaning of the area where the angle steel is placed on the base, so that impurities are not easy to affect the stable placement of the angle steel, and the welding quality is guaranteed to a certain extent.

[0009] Preferably, the connecting rod includes a horizontal section rotatably arranged on the support and a bending section arranged at one end of the horizontal section away from the support, the angle between the bending section and the horizontal section is 45°-135°, the rotating member is used to drive the horizontal section to rotate, the support rod is arranged between the two bending sections, and a baffle is jointly provided on the two bending sections, and the baffle is located between the support rod and the horizontal section.

[0010] By adopting the above technical solution, after the bristles are cleaned, the mounting frame is driven to rotate by the rotating member so that the support rod is located above the horizontal section. When the support moves toward the initial position, the baffle helps to block impurities on the bristles, making it difficult for the impurities to fall onto the surface of the base, thereby ensuring the cleanliness of the surface of the base.

[0011] Preferably, the sliding direction of the support is parallel to the sliding direction of the laser pen, the two supports are located on opposite sides of the laser pen and the curtain, and the horizontal section is located above the laser pen and the curtain.

[0012] Preferably, the sliding member includes a screw rotatably arranged on the base and a driving motor arranged on the base, the rotation axis of the screw is parallel to the sliding direction of the support, the screw corresponds to the support one by one, the support is threadedly connected to the corresponding screw, and the driving motor is used to drive the screw to rotate.

[0013] By adopting the above technical solution, the drive motor is started, the drive motor drives the screw to rotate, and the screw drives the corresponding support to move, so that the support rod drives the bristles to move to clean the area where the angle steel is placed on the base, so that impurities are not easy to affect the stable placement of the angle steel, thereby ensuring the welding quality to a certain extent.

[0014] Preferably, a fan is provided on the support rod, a delivery pipe is provided on the support rod, the delivery pipe is connected to the fan through a connecting pipe, the delivery pipe is located on the side away from the forward direction when the bristles are working, and a plurality of nozzles are connected to the delivery pipe, and the nozzles are arranged at a base facing one side of the bristles.

[0015] By adopting the above technical solution, the fan is started, and the fan delivers wind source into the conveying pipe, so that the nozzle blows air toward the base on the side of the bristles, which helps to blow impurities out of the base and further improve the cleaning effect of the base.

[0016] Preferably, a plurality of sliding rods are slidably provided on the baffle, the sliding direction of the sliding rods is perpendicular to the rotation axis of the horizontal section, the sliding rods are located on the side of the conveying tube away from the bristles, the sliding rods are used to abut against the surface of the base, and a pushing member is provided on the baffle for pushing the sliding rods to slide in a direction away from the horizontal section.

[0017] By adopting the above technical solution, when the bristles abut against the base for brushing, the slide rod abuts against the base. Whether the slide rod slides helps to determine whether the base is deformed due to the high temperature generated during welding, thereby further ensuring the welding quality.

[0018] Preferably, the pushing member includes a push spring mounted on the sliding rod, one end of the push spring is arranged on the baffle, and the other end is arranged on the sliding rod. When the push spring is in a natural state, the distance from one end of the sliding rod away from the horizontal segment to the line connecting the two horizontal segments is equal to the distance from the upper surface of the base to the line connecting the two horizontal segments.

[0019] Preferably, a section of the sliding rod close to the baffle is coated with a coating layer, and when the push spring is in a natural state, a side of the coating layer close to the horizontal section is flush with a side of the baffle close to the horizontal section.

[0020] By adopting the above technical solution, when the sliding rod and the base surface are in relative contact and sliding, if a protrusion appears on the base, the sliding rod will slide toward the horizontal section when in contact with the base surface, so that the paint layer moves out of the baffle, so that the operator can quickly determine whether the base is deformed.

[0021] In summary, this application includes the following beneficial technical effects:

[0022] The two supports are driven by the sliding member to slide synchronously from one end of the base toward the other end of the base, and the supports drive the connecting rod and the support rod to move between the abutment plates on the four sides, which are not easy to interfere with the abutment plates. The connecting rod is driven by the rotating member to drive the support rod to rotate in the direction close to the base, so that the bristles on the support rod abut against the surface of the base, and the two supports are continued to be driven by the sliding member to slide toward the other end of the base, so that the bristles take away impurities on the surface of the base, thereby facilitating the cleaning of the area where the angle steel is placed on the base, so that impurities are not easy to affect the stable placement of the angle steel, thereby ensuring the welding quality to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the mounting frame in the embodiment of the present application when it is in use.

[0024] Figure 2 It is a partial structural schematic diagram of the mounting frame in the initial state in the embodiment of the present application.

[0025] Figure 3 yes Figure 2 Enlarged view of part A.

[0026] Explanation of the accompanying drawings: 1. base; 2. support; 3. mounting frame; 31. connecting rod; 311. horizontal section; 312. bending section; 32. support rod; 4. bristles; 5. sliding member; 51. screw rod; 52. driving motor; 6. baffle; 7. fan; 8. conveying pipe; 9. connecting pipe; 10. nozzle; 11. sliding rod; 12. push spring; 13. stepping motor. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-3 This application is described in further detail.

[0028] The present application embodiment discloses a civil air defense door frame welding platform. Figure 1 The civil air defense door frame welding platform includes a base 1. The structure on the base 1 is the same as that in the related art and will not be described here. Supports 2 are slidably arranged on opposite sides of the upper surface of the base 1. The supports 2 extend in the vertical direction. The two supports 2 are located on opposite sides of the laser pen and the curtain, that is, the laser pen and the curtain are located between the two supports 2. The sliding direction of the support 2 is parallel to the sliding direction of the laser pen to reduce the impact on the use of the laser pen; the sliding direction of the support 2 is parallel to the plane where the base 1 is located.

[0029] Reference Figure 1 and Figure 2 A mounting frame 3 is rotatably arranged between the two supports 2, and the mounting frame 3 includes a connecting rod 31 and a support rod 32. The connecting rod 31 is rotatably arranged on a side of the support 2 close to the laser pen, and the end of the connecting rod 31 away from the support 2 is bent. The connecting rod 31 includes a horizontal section 311 and a bending section 312. The horizontal section 311 is rotatably arranged on a side of the support 2 close to the laser pen, the rotation axis of the horizontal section 311 is perpendicular to the sliding direction of the support 2, the length direction of the horizontal section 311 is parallel to the plane where the base 1 is located, and the horizontal section 311 is located above the laser pen and the curtain to reduce interference; the bending section 312 is integrally formed at the end of the horizontal section 311 away from the support 2, and the angle between the bending section 312 and the horizontal section 311 is 45°-135°. In the embodiment of the present application, the angle between the bending section 312 and the horizontal section 311 is 90°, so that the bending section 312 is perpendicular to the horizontal section 311, and the connecting rod 31 is L-shaped to reduce interference during the movement of the support 2.

[0030] Reference Figure 1 and Figure 2The support rod 32 is fixed between the two bending sections 312 on one side away from the horizontal section 311. The length direction of the support rod 32 is parallel to the length direction of the horizontal section 311. The length of the support rod 32 is smaller than the distance between any two opposite abutment plates on the base 1, wherein the distance between the two opposite abutment plates on the base 1 refers to the distance between the two opposite abutment plates in the retracted state; so that the support rod 32 can be located between the abutment plates on the four sides.

[0031] Reference Figure 1 and Figure 2 A side of the support rod 32 away from the horizontal section 311 is provided with bristles 4 for abutting against the surface of the base 1, a sliding member 5 for driving the support 2 to slide is provided on the base 1, and a rotating member for driving the horizontal section 311 to rotate is provided on the support 2. In the embodiment of the present application, the rotating member includes a stepper motor 13 fixedly mounted on any one of the supports 2, and the horizontal section 311 close to the side of the stepper motor 13 is coaxially fixed with the output shaft of the stepper motor 13. The stepper motor 13 is a reduction stepper motor. In other embodiments, the stepper motor 13 can be replaced by a servo motor, a drive motor, etc.

[0032] Before placing the angle steel on the base 1 for welding, the abutment plate is driven to be retracted by the electric push rod and is in a retracted state, thereby reserving enough space on the base 1 so that the support rod 32 is located between the abutment plates on both sides perpendicular to the sliding direction of the support 2. At this time, the support 2 and the mounting frame 3 are in an initial state, that is, the support 2 is located at one end edge of the base 1 in the sliding direction of the support 2, the bending section 312 is in a vertical state, and the support rod 32 is located above the horizontal section 311; then, the two supports 2 are driven by the sliding member 5 to slide synchronously toward the other end of the base 1 until the support 2 drives the support rod 32 to move between the abutment plates on the four sides, and then the stepping motor 13 is driven to rotate the mounting frame 3 180° toward the direction close to the base 1, so that the support rod 32 is located in the horizontal section Below 311, at this time, the mounting frame 3 is in use, the bristles 4 on the support rod 32 abut against the surface of the base 1, and the sliding member 5 continues to drive the two supports 2 to slide toward the other end of the base 1, so that the bristles 4 take away the impurities on the surface of the base 1 until the bristles 4 are close to the abutment plate at the other end of the base 1, and then the stepper motor 13 drives the horizontal section 311 to drive the support rod 32 to rotate 180° in the direction away from the base 1, so that the support rod 32 is located above the horizontal section 311, and then the sliding member 5 drives the two supports 2 to slide in the opposite direction for reset, providing space for the angle steel to be placed on the surface of the base 1 for welding, thereby helping to clean the area where the civil defense door frame is placed on the base 1, so that impurities are not easy to affect the placement of the angle steel, and to ensure the welding quality to a certain extent.

[0033] Reference Figure 1In order to facilitate driving the support 2 to slide, the sliding member 5 includes a screw 51 and a drive motor 52. The screw 51 corresponds to the support 2 one by one. The screw 51 is rotatably arranged on the surface of the base 1. The rotation axis of the screw 51 is parallel to the sliding direction of the support 2. The lower end of the support 2 is threadedly sleeved on the corresponding screw 51. The drive motor 52 corresponds to the screw 51 one by one. The drive motor 52 is fixedly installed on the base 1, and the screw 51 is coaxially fixed with the output shaft of the corresponding drive motor 52.

[0034] When it is necessary to drive the support 2 to move, the drive motor 52 is started, and the drive motor 52 drives the screw 51 to rotate, and the screw 51 drives the corresponding support 2 to move. Since the mounting frame 3 between the supports 2 on both sides is rotatably connected, the rotation of the support 2 is restricted, so that the support 2 will not rotate with the rotation of the screw 51.

[0035] Reference Figure 1 and Figure 2 The two bending sections 312 are sleeved with a baffle 6, which is located between the support rod 32 and the horizontal section 311. The length of the baffle 6 is greater than the length of the support rod 32, and the width of the baffle 6 is greater than the width of the support rod 32. After the bristles 4 clean the base 1, the stepper motor 13 drives the mounting frame 3 to rotate, so that the support rod 32 is located above the horizontal section 311, and the bending section 312 is located in a vertical state, and then the support 2 is driven to move toward the initial position. The baffle 6 helps to block impurities on the bristles 4, so that the impurities are not easy to fall onto the surface of the base 1, thereby ensuring the cleanliness of the surface of the base 1.

[0036] Reference Figure 2 and Figure 3 A fan 7 is fixedly installed on one side of the support rod 32 close to the horizontal section 311, and a delivery pipe 8 is fixed on one side of the support rod 32 away from the horizontal section 311. The delivery pipe 8 is arranged along the length direction of the support rod 32, and the delivery pipe 8 is connected with the fan 7 through a connecting pipe 9. The delivery pipe 8 is located on the side away from the forward direction when the bristles 4 abut against the surface of the base 1 for working. A plurality of nozzles 10 are connected to the delivery pipe 8, and the plurality of nozzles 10 are spaced apart along the length direction of the delivery pipe 8. The nozzles 10 are arranged toward the base 1 on one side of the bristles 4. In the process of the bristles 4 abutting and sliding against the surface of the base 1, the delivery pipe 8 is located on the side of the bristles 4 away from the forward direction.

[0037] When the support 2 moves to drive the bristles 4 to clean the surface of the base 1, the fan 7 is started, and the fan 7 delivers wind to the delivery pipe 8, so that the nozzle 10 blows air toward the base 1 on one side of the bristles 4, which helps to blow off the impurities on the support 2 and prevent the impurities from gathering at the edge of the base 1.

[0038] Reference Figure 1 and Figure 2A plurality of slide bars 11 are slidably penetrated on the baffle plate 6, and the plurality of slide bars 11 are spaced apart along the length direction of the baffle plate 6. The sliding direction of the slide bars 11 is perpendicular to the rotation axis of the horizontal section 311. The slide bars 11 are located on the side of the conveying tube 8 away from the bristles 4. The side of the slide bar 11 away from the horizontal section 311 is an arc surface, which is convex in the direction away from the horizontal section 311. The arc surface of the slide bar 11 is used to abut against the surface of the base 1. A pushing member is provided on the baffle plate 6 for pushing the slide bar 11 to slide in the direction away from the horizontal section 311.

[0039] Reference Figure 2 and Figure 3 The cam 12 is secured to the bottom of the base 1 and is easily retracted from the bottom of the base 1 when the spring 12 is in a position to move upwardly from the bottom of the base 1 to move the cam 12 downwardly from the bottom of the base 1 to move the cam 12 downwardly from the bottom of the base 1 to move the cam 12 downwardly from the bottom of the base 1 to move the cam 12 downwardly from the bottom of the base 1 to move the cam 12 downwardly from the bottom of the base 1 to move the cam 12 downwardly from the bottom of the base 1 to move the cam 12 downwardly from the bottom of the base 1 to move the cam 12 downwardly from the bottom of the base 1 to move the cam 12

[0040] Reference Figure 1 and Figure 2 A section of the slide bar 11 close to the baffle 6 is coated with a red paint layer (not shown in the figure). When the push spring 12 is in a natural state, the side of the paint layer close to the horizontal section 311 is flush with a side of the baffle 6 close to the horizontal section 311.

[0041] When the mounting frame 3 is in use, that is, the bending section 312 is in a vertical state, the support rod 32 is located below the horizontal section 311, and when the bristles 4 abut against the surface of the base 1, the lower end of the slide rod 11 abuts against the surface of the base 1. As the support 2 moves, the slide rod 11 slides and abuts against the surface of the base 1. If the surface of the base 1 is deformed due to the high temperature generated by welding and causes a bulge, the slide rod 11 will slide toward the direction close to the horizontal section 311 under the action of the bulge, thereby moving the paint layer out of the side of the baffle 6 close to the horizontal section 311, which is convenient for the operator to observe, thereby facilitating the operator to judge whether the surface of the base 1 is deformed, which helps to ensure the welding quality.

[0042] The implementation principle of the embodiment of the present application is as follows: before the angle steel is placed on the base 1 for welding, the abutment plate is driven to be retracted by the electric push rod so that the support rod 32 is located between the abutment plates on both sides perpendicular to the sliding direction of the support 2. At this time, the support 2 and the mounting frame 3 are in the initial state, that is, the support 2 is located at one end edge of the base 1 in the sliding direction of the support 2, the bending section 312 is in a vertical state, and the support rod 32 is located above the horizontal section 311; then the drive motor 52 is started, and the drive motor 52 drives the screw rod 51 to rotate, and the screw rod 51 drives the two supports 2 to slide synchronously toward the other end of the base 1 until the support 2 drives the support rod 32 to move between the abutment plates on the four sides. , and then the stepper motor 13 drives the mounting frame 3 to rotate 180° toward the side close to the forward direction, so that the support rod 32 is located below the horizontal section 311, and the bristles 4 on the support rod 32 abut against the surface of the base 1, and the curved surface of the sliding rod 11 abuts against the surface of the first base 1, and the fan 7 is started. Then the driving motor 52 continues to drive the two supports 2 to slide toward the other end of the base 1, so that the bristles 4 take away the impurities on the surface of the base 1, and the nozzle 10 blows air toward the base 1 until the support rod 32 approaches the abutment plate at the other end of the base 1, and the bristles 4 bring the impurities to the edge of the other end of the base 1, and the fan 7 blows the impurities off the base 1, and the sliding rod 11 detects the deformation of the surface of the base 1.

[0043] Then start the stepper motor 13 to drive the horizontal section 311 to drive the support rod 32 to rotate 180° in the opposite direction for reset, so that the support rod 32 is located above the horizontal section 311, and then start the drive motor 52 to drive the two supports 2 to slide back for reset, until the support rod 32 moves out from between the abutment plates in four directions and resets to the initial state. At this time, the angle steel of the civil air defense door frame can be placed on the surface of the base 1 for welding, which helps to clean the area where the angle steel is placed on the base 1, so that impurities are not easy to affect the stable placement of the angle steel, thereby ensuring the welding quality to a certain extent.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A civil air defense door frame welding platform, comprising a base (1), characterized in that: Supports (2) are slidably arranged on opposite sides of the base (1), the sliding direction of the support (2) is parallel to the plane where the base (1) is located, and a mounting frame (3) is rotatably arranged between the supports (2) on both sides, and the mounting frame (3) includes a connecting rod (31) rotatably arranged on the support (2) and a support rod (32) arranged between the two connecting rods (31), the rotation axis of the connecting rod (31) is perpendicular to the sliding direction of the support (2), and the connecting rod (31) is far away from the support (2). The support rod (32) is arranged at one end away from the support (2), the support rod (32) is arranged at one end of the two connecting rods (31) away from the support (2), the length of the support rod (32) is less than the spacing between the abutment plates on the two opposite sides of the base (1), the support rod (32) is provided with bristles (4) for abutting against the surface of the base (1), the base (1) is provided with a sliding member (5) for driving the support (2) to slide, and the support (2) is provided with a rotating member for driving the connecting rod (31) to rotate.

2. The civil air defense door frame welding platform according to claim 1, characterized in that: The connecting rod (31) comprises a horizontal section (311) rotatably arranged on the support (2) and a bent section (312) arranged at one end of the horizontal section (311) away from the support (2); the angle between the bent section (312) and the horizontal section (311) is 45°-135°; the rotating member is used to drive the horizontal section (311) to rotate; the support rod (32) is arranged between the two bent sections (312); a baffle (6) is commonly sleeved on the two bent sections (312); and the baffle (6) is located between the support rod (32) and the horizontal section (311).

3. The civil air defense door frame welding platform according to claim 2, characterized in that: The sliding direction of the support (2) is used to be parallel to the sliding direction of the laser pen, the two supports (2) are located on opposite sides of the laser pen and the curtain, and the horizontal section (311) is located above the laser pen and the curtain.

4. The civil air defense door frame welding platform according to claim 1, characterized in that: The sliding member (5) comprises a screw rod (51) rotatably arranged on the base (1) and a driving motor (52) arranged on the base (1); the rotation axis of the screw rod (51) is parallel to the sliding direction of the support (2); the screw rod (51) corresponds to the support (2) one by one; the support (2) is threadedly connected to the corresponding screw rod (51); and the driving motor (52) is used to drive the screw rod (51) to rotate.

5. The civil air defense door frame welding platform according to claim 2, characterized in that: The support rod (32) is provided with a fan (7), and the support rod (32) is provided with a delivery pipe (8), the delivery pipe (8) is connected to the fan (7) through a connecting pipe (9), the delivery pipe (8) is located on the side away from the forward direction of the bristles (4) when working, and the delivery pipe (8) is connected with a plurality of nozzles (10), and the nozzles (10) are arranged on the base (1) on the side of the bristles (4).

6. The civil air defense door frame welding platform according to claim 5, characterized in that: A plurality of slide bars (11) are slidably provided on the baffle plate (6); the sliding direction of the slide bars (11) is perpendicular to the rotation axis of the horizontal section (311); the slide bars (11) are located on the side of the conveying tube (8) away from the bristles (4); the slide bars (11) are used to abut against the surface of the base (1); and a pushing member is provided on the baffle plate (6) for pushing the slide bars (11) to slide in a direction away from the horizontal section (311).

7. The civil air defense door frame welding platform according to claim 6, characterized in that: The pushing member comprises a push spring (12) sleeved on the slide rod (11), one end of the push spring (12) being arranged on the baffle (6), and the other end being arranged on the slide rod (11); when the push spring (12) is in a natural state, the distance from one end of the slide rod (11) away from the horizontal section (311) to the line connecting the two horizontal sections (311) is equal to the distance from the upper surface of the base (1) to the line connecting the two horizontal sections (311).

8. The civil air defense door frame welding platform according to claim 7, characterized in that: A section of the slide bar (11) close to the baffle (6) is coated with a coating layer, and when the push spring (12) is in a natural state, a side of the coating layer close to the horizontal section (311) is flush with a side of the baffle (6) close to the horizontal section (311).

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