Aluminum profile extruding machine with adjusting function

Abstract

The invention discloses an aluminum profile extruding machine with an adjusting function, and particularly relates to the technical field of metal extrusion, the aluminum profile extruding machine comprises a multi-directional extruding mechanism and a movable frame, the multi-directional extruding mechanism comprises a displacement shaft, a sliding sleeve block and an arc-shaped rail, the displacement shaft slides on the inner wall of the movable frame, the sliding sleeve block is fixed to one end of the displacement shaft, the arc-shaped rail is arranged on the outer wall of the sliding sleeve block, and the sliding sleeve block is fixed to the inner wall of the movable frame; the arc-shaped rail is used for guiding the sliding sleeve block to move. The multi-directional extrusion mechanism is adopted, and the multi-directional extrusion mechanism has the advantages that multiple branch points of an aluminum profile achieve synchronous adjustment and extrusion in different directions, parameters do not need to be adjusted multiple times, the waiting and joining time of extrusion machining is shortened, and the extrusion machining efficiency is greatly improved, so that the problems that equipment needs to adjust operation parameters multiple times, waiting and joining time exists among different steps, and equipment cost is reduced are solved. Therefore, the overall processing rhythm is difficult to be compact and efficient, and finally, the efficiency of adjusting and extruding at different directions of each branch point of the aluminum profile is relatively low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal extrusion, more particularly, the present application relates to an aluminum profile extrusion machine with adjustment function. BACKGROUND

[0002] The aluminum profile extrusion machine forms a profile with a specific cross-sectional shape by forcibly passing an aluminum profile in a plastic state through a specified pressure through a process, and the extrusion process can directly obtain a profile close to the final size, reducing the subsequent processing allowance.

[0003] In the existing public literature, patent No. CN213079569U discloses an aluminum profile extrusion machine with temperature sensing function. The technology is that two connecting blocks are rotatably installed with transmission rods, two recesses and two through grooves are formed on the top of the base, and a light rod is fixedly installed between the inner walls of the two recesses. The technology is reasonable in design and simple in operation, can adjust the height of the extrusion machine according to the height of the user, brings great convenience to the user, and improves the work efficiency. However, this technology has the following defects.

[0004] When the aluminum profile is extruded, the corner regions of each branch of the aluminum profile exist in different extrusion directions, which brings difficulties to the extrusion process. The extrusion machine needs to adjust the extrusion direction for one point first, and then adjust the extrusion direction for other points one by one after completion. It is difficult to carry out synchronous adjustment and extrusion processing of different directions for each branch point of the aluminum profile. This step-by-step adjustment method makes the processing flow complicated when dealing with the adjustment and extrusion of different directions of each branch point. The equipment needs to adjust the operating parameters multiple times, and there is waiting and connection time between different steps, which makes the overall processing rhythm difficult to be compact and efficient, and finally causes the efficiency of the adjustment and extrusion of different directions of each branch point of the aluminum profile to be relatively low. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the present application provides the following technical scheme: an aluminum profile extrusion machine with adjustment function, comprising an electric cylinder, the output end of the electric cylinder is connected with a connecting plate for downward movement, the outer walls of both ends of the connecting plate are fixed with a movable frame, a multidirectional extrusion mechanism is installed on the inner wall of the movable frame, the multidirectional extrusion mechanism comprises: a displacement shaft sliding on the inner wall of the movable frame, one end of the displacement shaft is fixed with a sliding sleeve block, an arc rail is arranged on the outer wall of the sliding sleeve block, and the arc rail is used for guiding the movement of the sliding sleeve block; a pressure groove plate fixed on the top end of the sliding sleeve block, the inner wall of the pressure groove plate is placed with an aluminum profile; a linkage plate connected to one end of the movable frame, a linkage frame is fixed on the top end of the linkage plate, a diagonal frame is fixedly connected to the top end of the linkage frame, a pressure shaft is slidingly arranged in the inner wall of the diagonal frame, and a horizontal plate is fixed to one end of the pressure shaft; A linkage frame is fixed to the other end of the linkage bracket. An inclined column slides on the inner wall of the linkage frame, and an inclined pressure plate is fixed to one end of the inclined column.

[0006] In a preferred embodiment, a gap is provided between the pressure plate and the moving frame, and the displacement shaft slides along the inside of the arc-shaped rail; The inclined frame is slidably connected to the horizontal plate, and the linkage frame is slidably connected to the inclined pressure plate.

[0007] In a preferred embodiment, the inclined frame and the inclined pressure plate are both inclined, the linkage frame and the horizontal plate are both horizontal, and the inclined pressure plate is higher than the horizontal plate.

[0008] In a preferred embodiment, a pull rod is installed at the other end of the moving frame; An inclined plate is fixed to the top of the pull rod. An inclined moving plate is fixed to one inclined surface of the inclined plate. The inclined moving plate is slidably connected to the aluminum profile. The inclined moving plate is used to extrude the aluminum profile.

[0009] In a preferred embodiment, the vertical cross-sectional shape of the inner groove of the inclined plate is V-shaped, and the two tie rods are symmetrically arranged about the middle of the inclined plate.

[0010] In a preferred embodiment, a horizontal rail is installed on the outer wall of the horizontal plate, and the horizontal plate and the horizontal rail are slidably connected; an inclined rail is installed on the outer wall of the inclined pressure plate, and the inclined pressure plate and the inclined rail are slidably connected. The bottom end of the horizontal rail is provided with a support bar, and both the horizontal rail and the inclined rail are fixedly connected to the support bar. The bottom end of the support bar is connected to a reinforcing beam, and a base frame is fixedly installed at one end of the reinforcing beam. The arc-shaped rail is fixedly connected to the reinforcing beam.

[0011] In a preferred embodiment, an outer frame is mounted on the upper surface of the base frame, and a controller is mounted on one side of the outer frame.

[0012] In a preferred embodiment, a positioning plate is mounted on the upper surface of the electric cylinder for positioning the aluminum profile, and a distance sensor is provided on one side of the electric cylinder for sensing the downward movement distance of the connecting plate.

[0013] In a preferred embodiment, the positioning plate is fixedly connected to the distance sensor, and a gap is provided between the positioning plate and the connecting plate.

[0014] In a preferred embodiment, the bottom end of the distance sensor is arranged parallel to the upper surface of the connecting plate.

[0015] The technical effects and advantages of the present invention.

[0016] 1. This invention employs a multi-directional extrusion mechanism. Compared with existing technologies, the output end of the electric cylinder pushes the connecting plate to drive two moving frames to move down synchronously. The moving frames cause the displacement shaft and sliding block to move down along an arc path, driving the pressure groove plate to extrude the bottom branch point of the aluminum profile in an arc. At the same time, the moving frames drive the linkage plate and linkage frame to move down, causing the inclined frame to extrude the pressure shaft. The horizontal plate moves horizontally to the right to extrude the lower part of the left branch point of the aluminum profile. The linkage frame drives the inclined column and inclined pressure plate to move down at an angle, extruding at the upper part of the left branch point of the aluminum profile. This allows multiple branch points of the aluminum profile to achieve synchronous adjustment and extrusion in different directions, eliminating the need for multiple parameter adjustments, reducing the waiting time for extrusion processing, and significantly improving extrusion processing efficiency.

[0017] 2. This invention uses a moving frame to drive a pull rod, which in turn moves the inclined plate and the inclined corner plate downwards in sequence. The inclined corner plate presses down on the right corner branch point of the aluminum profile, achieving extrusion molding in different directions. At the same time, a distance sensor monitors the distance between the aluminum profile and the connecting plate in real time. When the monitored value is the same as the extrusion distance set by the controller, the controller shuts off the electric cylinder. This allows for simultaneous extrusion of multiple branch points of the aluminum profile in different directions without the need to repeatedly adjust the operating parameters at each point and in different directions. This significantly reduces waiting and connection time, making the overall processing rhythm more compact and efficient, and significantly improving the efficiency of adjusting the extrusion of each branch point of the aluminum profile in different directions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the aluminum profile extrusion press with adjustable function according to the present invention.

[0019] Figure 2 This is a schematic diagram of a partial cut-off structure at the connection between the moving frame and the displacement shaft of the present invention.

[0020] Figure 3 This is a partial structural diagram of the connection between the positioning plate and the electric cylinder of the present invention.

[0021] Figure 4 This is a partial structural diagram of the connection between the linkage plate and the linkage frame of the present invention.

[0022] Figure 5 This is a partial structural diagram of the inclined rail and linkage frame of the present invention.

[0023] Figure 6 This is a schematic diagram of a partial structure of the inclined rail cutoff according to the present invention.

[0024] Figure 7 This is a partial structural diagram of the connection between the tie rod and the inclined plate of the present invention.

[0025] Figure 8 This is a partial structural diagram of the connection between the inclined bend plate and the inclined moving plate of the present invention, viewed from below.

[0026] Figure 9This is a partial structural diagram of the connection between the support bar and the cross rail of the present invention.

[0027] The attached diagram is labeled as follows: 1. Electric cylinder; 2. Connecting plate; 3. Moving frame; 4. Displacement shaft; 5. Arc rail; 6. Sliding block; 7. Pressure groove plate; 8. Linkage plate; 9. Inclined frame; 10. Pressure shaft; 11. Horizontal plate; 12. Linkage frame; 13. Inclined column; 14. Inclined pressure plate; 15. Inclined turn plate; 16. Inclined moving plate; 17. Aluminum profile; 18. Horizontal rail; 19. Inclined rail; 20. Support bar; 21. Reinforcing beam; 22. Base frame; 23. Positioning plate; 24. Outer frame; 25. Controller; 26. Distance sensor; 27. Linkage frame; 28. Tie rod. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figure 1 - Figure 9 The present invention relates to an aluminum profile extrusion press with adjustable function. The aluminum profile extrusion press with adjustable function is equipped with a multi-directional extrusion mechanism. The multi-directional extrusion mechanism enables the aluminum profile to be extruded synchronously in different directions at more than 17 branch points without the need for multiple parameter adjustments, thereby reducing the waiting time for extrusion processing and greatly improving the extrusion processing efficiency. The specific structural configuration of the multi-directional extrusion mechanism is as follows.

[0030] In this embodiment, as Figure 1 - Figure 6As shown, the device includes an electric cylinder 1, the output end of which is connected to a connecting plate 2 for downward movement. Moving frames 3 are fixed to the outer walls of both ends of the connecting plate 2. A multi-directional pressing mechanism is installed on the inner wall of the moving frame 3. The multi-directional pressing mechanism includes: a displacement shaft 4, which slides on the inner wall of the moving frame 3; a sliding block 6 is fixed to one end of the displacement shaft 4; an arc-shaped rail 5 is provided on the outer wall of the sliding block 6 to guide its movement; a pressure groove plate 7, fixed to the top of the sliding block 6; an aluminum profile 17 placed on the inner wall of the pressure groove plate 7; a linkage plate 8, connected to one end of the moving frame 3; a linkage frame 27 fixed to the top of the linkage plate 8; an inclined frame 9 fixed to the top of the linkage frame 27; a pressure shaft 10 sliding on the inner wall of the inclined frame 9; a horizontal plate 11 fixed to one end of the pressure shaft 10; and a linkage frame 12, fixed to the other top of the linkage frame 27; an inclined column 13 sliding on the inner wall of the linkage frame 12; and an inclined pressure plate 14 fixed to one end of the inclined column 13. A gap is provided between the pressure plate 7 and the moving frame 3, and the displacement shaft 4 slides along the inside of the arc-shaped rail 5; the inclined frame 9 is slidably connected to the horizontal plate 11, and the linkage frame 12 is slidably connected to the inclined pressure plate 14. The inclined frame 9 and the inclined pressure plate 14 are both inclined, the linkage frame 12 and the horizontal plate 11 are both horizontal, and the inclined pressure plate 14 is higher than the horizontal plate 11.

[0031] In use, the output end of the electric cylinder 1 pushes the connecting plate 2 downward, the moving frame 3 drives the displacement shaft 4 to move downward along the arc path, the sliding block 6 moves downward along the inner wall of the arc-shaped rail 5 along the arc path, the pressing plate 7 performs an arc-path extrusion operation on the bottom branch point of the aluminum profile 17, and at the same time, the downward movement of the moving frame 3 will drive the linkage plate 8 to move downward synchronously, the linkage frame 27 drives the inclined frame 9 to move downward, the pressing shaft 10 drives the horizontal plate 11 to move horizontally to the right, the horizontal plate 11 can perform horizontal extrusion forming on the lower part of the left branch point of the aluminum profile 17, the linkage frame 12 drives the inclined column 13 to move downward at an angle, so that the inclined pressure plate 14 can simultaneously perform inclined extrusion forming on the upper part of the left branch point of the aluminum profile 17, which greatly improves the efficiency of extrusion when the various branch points of the aluminum profile 17 are adjusted in different directions.

[0032] In this embodiment, as Figure 1 - Figure 8 As shown, a pull rod 28 is installed at the other end of the moving frame 3; a slanted bend plate 15 is fixed to the top of the pull rod 28, and a slanted moving plate 16 is fixed to one inclined surface of the slanted bend plate 15. The slanted moving plate 16 is slidably connected to the aluminum profile 17 and is used to extrude the aluminum profile. The vertical cross-section of the inner groove of the slanted bend plate 15 is V-shaped, and the two pull rods 28 are symmetrically arranged about the middle of the slanted moving plate 16. When the moving frame 3 moves down, the pull rod 28 moves down, and the slanted moving plate 16 moves the slanted bend plate 15 down. The slanted bend plate 15 will tilt and press down on the right corner branch point of the aluminum profile 17, so that the right corner branch point of the aluminum profile 17 can be extruded in different directions at the same time.

[0033] In this embodiment, as Figure 4 - Figure 9 As shown, a horizontal rail 18 is installed on the outer wall of the horizontal plate 11, and the horizontal plate 11 and the horizontal rail 18 are slidably connected. An inclined rail 19 is installed on the outer wall of the inclined pressure plate 14, and the inclined pressure plate 14 and the inclined rail 19 are slidably connected. A support bar 20 is provided at the bottom end of the horizontal rail 18, and both the horizontal rail 18 and the inclined rail 19 are fixedly connected to the support bar 20. A reinforcing beam 21 is connected to the bottom end of the support bar 20, and a base frame 22 is fixedly installed at one end of the reinforcing beam 21. The arc-shaped rail 5 is fixedly connected to the reinforcing beam 21. The base frame 22 supports the reinforcing beam 21, the reinforcing beam 21 supports the support bar 20, and the support bar 20 provides support force to the inclined rail 19 and the horizontal rail 18, ensuring the stable use of the horizontal rail 18 and the inclined rail 19.

[0034] In this embodiment, as Figure 1 As shown, an outer frame 24 is mounted on the upper surface of the base frame 22, and a controller 25 is mounted on one side of the outer frame 24. The controller 25 is supported by the outer frame 24, and the controller 25 can start the electric cylinder 1 to realize the operation of pushing the connecting plate 2 downward by the output end of the electric cylinder 1.

[0035] In this embodiment, as Figure 1 - Figure 3 As shown, a positioning plate 23 is mounted on the upper surface of the electric cylinder 1. The positioning plate 23 is used to position the aluminum profile 17. A distance sensor 26 is provided on one side of the electric cylinder 1. The distance sensor 26 is used to sense the downward movement distance of the connecting plate 2. The positioning plate 23 and the distance sensor 26 are fixedly connected, and there is a gap between the positioning plate 23 and the connecting plate 2. The bottom end of the distance sensor 26 is parallel to the upper surface of the connecting plate 2. The positioning plate 23 supports the distance sensor 26, and the distance sensor 26 senses the distance between the distance sensor 26 and the connecting plate 2. When the distance value sensed by the distance sensor 26 is the same as the extrusion distance set and adjusted on the controller 25, the controller 25 closes the electric cylinder 1, thereby controlling and adjusting the extrusion distance value and adjusting the corresponding extrusion parameters.

[0036] The working principle of the aluminum profile extrusion press with adjustment function of the present invention is as follows.

[0037] Step 1: During positioning and installation, the positioning plate 23 is supported by the base frame 22, and the base frame 22 also supports the outer frame 24. First, the aluminum profile 17 is preheated as a whole. Then, the lower surface of the aluminum profile 17 is attached to the upper surface of the positioning plate 23, and one end of the positioning plate 23 positions the aluminum profile 17. At the same time, the bottom support point of the aluminum profile 17 is located on the inner wall of the pressure groove plate 7, and the left support point of the aluminum profile 17 is located between the horizontal rail 18 and the inclined rail 19. Meanwhile, the right support point of the aluminum profile 17 is located in the V-shaped groove on the inner wall of the inclined plate 16. After the aluminum profile 17 is positioned, the extrusion distance is adjusted by setting the controller 25.

[0038] Step 2: During multi-directional adjustable extrusion, the electric cylinder 1 is immediately activated by the controller 25. The output end of the electric cylinder 1 pushes the connecting plate 2 downward. At the same time, the base frame 22 supports the positioning plate 23, which provides support force to the electric cylinder 1, ensuring that the connecting plate 2 drives the two moving frames 3 to move downward synchronously. The moving frames 3 drive the displacement shaft 4 to move downward along the arc path. Simultaneously, the displacement shaft 4 causes the sliding block 6 to move downward along the inner wall of the arc-shaped rail 5 in an arc path. The sliding block 6 drives the pressing plate 7 to rotate and extrude along the arc path. The pressing plate 7 performs an arc-shaped extrusion operation on the bottom branch point of the aluminum profile 17. At the same time, the base frame 22 supports the reinforcing beam 21, which in turn supports the arc-shaped rail 5, increasing the stability of the arc-shaped rail 5.

[0039] Simultaneously, the downward movement of the moving frame 3 will cause the linkage plate 8 to move downward in sync. The linkage plate 8 will cause the linkage frame 27 to move downward in sync. The linkage frame 27 will cause the inclined frame 9 to move downward. The inclined frame 9 will press the pressure shaft 10. The pressure shaft 10 will cause the horizontal plate 11 to move horizontally to the right. At the same time, the horizontal plate 11 will slide along the inner wall of the horizontal rail 18. In this way, the horizontal plate 11 can perform horizontal extrusion forming on the lower part of the left branch point of the aluminum profile 17. At the same time, the downward movement of the linkage frame 27 will cause the linkage frame 12 to move downward. The linkage frame 12 will cause the inclined column 13 to move downward at an angle. The inclined column 13 will cause the inclined pressure plate 14 to move downward at an angle. The inclined pressure plate 14 will move downward at an angle along the inner wall of the inclined rail 19. The inclined pressure plate 14 can simultaneously perform inclined extrusion forming on the upper part of the left branch point of the aluminum profile 17. This achieves synchronous extrusion forming on the upper and lower parts of the left branch point of the aluminum profile 17 in different directions. The support beam 21 supports the support bar 20, which in turn supports the horizontal rail 18 and the inclined rail 19, thereby improving the stability of the horizontal rail 18 and the inclined rail 19.

[0040] Step 3: During the inclined corner extrusion, when the moving frame 3 moves down, it drives the pull rod 28 down, which in turn drives the inclined moving plate 16 down. The inclined moving plate 16 then drives the inclined corner plate 15 down, which in turn presses down on the right corner branch point of the aluminum profile 17, causing the right corner branch point of the aluminum profile 17 to be extruded and formed in different directions. The distance sensor 26 senses the distance between itself and the connecting plate 2. When the distance value sensed by the distance sensor 26 matches the extrusion distance set on the controller 25, the controller 25 shuts off the electric cylinder 1. This allows multiple branch points of the aluminum profile 17 to be extruded and formed synchronously in different directions, avoiding the need for repeated adjustments to each point and significantly improving the efficiency of the extrusion adjustment.

[0041] All contents not described in detail in the specification are existing technologies known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used. Electrical control components not mentioned in this technical solution are not shown in the figures because they are existing technologies, and will not be described here.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An aluminum profile extrusion machine with adjusting function, comprising an electric cylinder (1), the output end of the electric cylinder (1) is connected with a connecting plate (2) for downward movement, the outer wall of both ends of the connecting plate (2) is fixed with a moving frame (3), characterized in that: The inner wall of the movable frame (3) is provided with a multidirectional extrusion mechanism, which comprises: A displacement shaft (4) slides in the inner wall of the movable frame (3), one end of the displacement shaft (4) is fixed with a sliding sleeve block (6), the outer wall of the sliding sleeve block (6) is provided with an arc rail (5), the arc rail (5) is used for guiding the movement of the sliding sleeve block (6); A pressing groove plate (7) is fixed at the top end of the sliding sleeve block (6), and the inner wall of the pressing groove plate (7) is placed with an aluminum profile (17); A linkage plate (8) is connected to one end of the movable frame (3), the top end of the linkage plate (8) is fixed with a linkage frame (27), the top end of the linkage frame (27) is fixedly connected with an inclined frame (9), the inner wall of the inclined frame (9) slides with a pressing shaft (10), one end of the pressing shaft (10) is fixed with a horizontal plate (11); A linkage frame (12) is fixed to the other top end of the linkage frame (27), the inner wall of the linkage frame (12) slides with an inclined column (13), one end of the inclined column (13) is fixed with an inclined pressing plate (14).

2. The aluminum extrusion press with a regulating function according to claim 1, characterized in that: The pressing groove plate (7) and the movable frame (3) are provided with a gap, the displacement shaft (4) slides along the inside of the arc rail (5); The inclined frame (9) and the horizontal plate (11) are slidingly connected, and the linkage frame (12) and the inclined pressing plate (14) are slidingly connected.

3. The aluminum extrusion press with a regulating function according to claim 1, characterized in that: The inclined frame (9) and the inclined pressing plate (14) are both inclined, the linkage frame (12) and the horizontal plate (11) are both horizontally arranged, and the inclined pressing plate (14) is higher than the horizontal plate (11).

4. The aluminum extrusion press with a regulating function according to claim 1, characterized in that: The other end of the movable frame (3) is provided with a pull rod (28); An inclined bent plate (15) is fixed to the top end of the pull rod (28), one side of the inclined bent plate (15) is inclined and provided with an inclined moving plate (16), the inclined moving plate (16) is slidingly connected with the aluminum profile (17), and the inclined moving plate (16) is used for extruding the aluminum profile.

5. The aluminum profile extrusion machine with a regulating function according to claim 4, characterized in that: The inner groove of the inclined bent plate (15) is V-shaped in vertical section, and the two pull rods (28) are symmetrically arranged about the middle part of the inclined moving plate (16).

6. The aluminum extrusion press with a regulating function according to claim 1, characterized in that: The outer wall of the horizontal plate (11) is provided with a horizontal rail (18), the horizontal plate (11) and the horizontal rail (18) are slidingly connected, the outer wall of the inclined pressing plate (14) is provided with an inclined rail (19), and the inclined pressing plate (14) and the inclined rail (19) are slidingly connected; The bottom end of the horizontal rail (18) is provided with a support strip (20), the horizontal rail (18) and the inclined rail (19) are fixedly connected with the support strip (20), the bottom end of the support strip (20) is connected with a reinforcing beam (21), one end of the reinforcing beam (21) is fixedly provided with a base frame (22), and the arc rail (5) is fixedly connected with the reinforcing beam (21).

7. The aluminum profile extrusion machine with a regulating function according to claim 6, characterized in that: The upper surface of the base frame (22) is provided with an outer frame (24), and one side of the outer frame (24) is provided with a controller (25).

8. The aluminum extrusion machine with a regulating function according to claim 1, characterized in that: The upper surface of the electric cylinder (1) is provided with a positioning plate (23), the positioning plate (23) is used for positioning the aluminum profile (17), one side of the electric cylinder (1) is provided with a distance sensor (26), and the distance sensor (26) is used for sensing the downward distance of the connecting plate (2).

9. The aluminum profile extrusion machine with a regulating function according to claim 8, characterized in that: The positioning plate (23) is fixedly connected with the distance sensor (26), and a gap is arranged between the positioning plate (23) and the connecting plate (2).

10. The aluminum profile extrusion machine having a regulating function according to claim 8, characterized in that: The bottom end of the distance sensor (26) is arranged in parallel with the upper surface of the connecting plate (2).

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