A dial mechanism for glass bottles

Abstract

The present application relates to the technical field of filling machines, and specifically to a dial mechanism for glass bottles, comprising a dial, a mounting plate, a driving assembly, a rotating shaft, a supporting platform and a frame; the supporting platform is fixedly arranged on the top wall of the frame, and the rotating shaft penetrates the supporting platform along the central axis direction of the supporting platform; the end of the rotating shaft located above the supporting platform is fixedly connected to the mounting plate, the mounting plate and the rotating shaft are coaxially arranged, the dial is fixedly connected to the mounting plate, a plurality of inspection holes are provided on the mounting plate, the dial comprises an upper gear plate, a lower gear plate and a plurality of vertical rods, and a center hole is provided on the upper gear plate and the lower gear plate; the provided inspection hole is convenient for observing the operation of the dial mechanism and for inspecting the dial mechanism, and at the same time, the inspection hole can provide better ventilation effect, reduce the temperature of the driving assembly and prolong the service life; the provided center hole reduces the overall weight of the dial, which not only reduces the production cost, but also facilitates reducing the inertia of the dial mechanism and improving the response speed and stability.

Description

Technical Field

[0001] The present application relates to the technical field of filling machines, and in particular to a dial mechanism for glass bottles. Background Art

[0002] In the field of beverage filling, after the prepared glass bottles are cleaned and disinfected, they are transported to the filling area through the conveying system and accurately positioned by the positioning system. The filling head accurately fills the liquid or semi-liquid product into the glass bottle according to the preset filling volume. After the filling is completed, the sealing device seals the container to ensure that the beverage will not leak during transportation and storage. Qualified products are output through the conveying system and are ready to enter the next production link.

[0003] In the glass bottle conveying and positioning system, the dial plays a key role. The arc-shaped teeth on its outer circumference ensure that each glass bottle can be accurately positioned on a tooth. When the rotating shaft coaxially connected to the dial drives the dial to rotate, the arc-shaped teeth of the dial drive the glass bottles to rotate synchronously. The protective wall arranged around the dial limits the position of the glass bottles. Driven by the arc-shaped teeth, the glass bottles are conveyed to the bottom of each filling head of the filling machine. After the filling head finishes filling, the dial continues to rotate to drive the glass bottles to the next station.

[0004] In the beverage filling production, the dial is often misaligned. The glass bottle driven by the dial cannot be aligned with the filling head, resulting in the filling head being unable to accurately fill the beverage into the glass bottle during filling, thereby causing waste of production raw materials. Therefore, it is necessary to inspect and adjust the drive device and sensor under the dial. For the existing dial and installation structure, due to the large size of the dial, the drive device and the sensor are covered by the dial, and it is inconvenient to disassemble and assemble the dial mechanism for inspection and adjustment. Utility Model Content

[0005] In order to facilitate the maintenance of the dial mechanism, the present application provides a dial mechanism for a glass bottle.

[0006] The present application provides a dial mechanism for a glass bottle adopts the following technical solution:

[0007] A dial mechanism for a glass bottle, comprising a dial, a mounting plate, a driving assembly, a rotating shaft, a supporting platform and a frame; the supporting platform is fixedly arranged on the top wall of the frame, the supporting platform is arranged in a ring shape, and the rotating shaft passes through the supporting platform along the central axis direction of the supporting platform;

[0008] The end of the rotating shaft located above the supporting platform is fixedly connected to the mounting plate, the mounting plate is coaxially arranged with the rotating shaft, and the dial is fixedly connected to the mounting plate; a plurality of inspection holes are opened on the mounting plate.

[0009] The driving device is fixedly arranged below the supporting platform, and is used to drive the rotating shaft to rotate;

[0010] A conveyor belt is arranged on one side of the supporting platform, and a filling machine is arranged on the other side.

[0011] By adopting the above technical scheme, when the conveyor belt conveys the glass bottle to the vicinity of the supporting platform, the driving device drives the rotating shaft to rotate, the rotating shaft drives the mounting plate to rotate, the mounting plate drives the dial to rotate, and when the arc-shaped teeth on the dial rotate to the vicinity of the glass bottle, the conveyor belt conveys the glass bottle into the arc-shaped teeth, and as the dial continues to rotate, the arc-shaped teeth drive the glass bottle to move to the supporting platform, and when the glass bottle moves to the bottom of the filling machine, the dial stops rotating, and the filling head fills the glass bottle. After the filling is completed, the dial continues to rotate, and the glass bottle is driven to the next work section; the inspection hole provided on the mounting plate is convenient for observing the operation of the driving assembly under the mounting plate. When the dial mechanism is misplaced, the operator can easily inspect the driving assembly under the mounting plate through the inspection hole. At the same time, the inspection hole provided can provide better ventilation effect, help reduce the temperature of the driving mechanism during operation, and extend the service life of the dial.

[0012] In a specific possible implementation scheme, the frame includes columns, transverse support beams and support sleeves, multiple columns are fixedly arranged on the bottom wall of the support platform, the support sleeve is arranged at the center of the frame, one end of multiple transverse support beams is fixedly connected to one end of the column close to the mounting plate, and the other end is fixedly connected to the support sleeve, and the extension lines of the multiple transverse support beams in the length direction coincide with the center of the support sleeve;

[0013] The rotating shaft is arranged to pass through the central axis of the supporting sleeve, and the rotating shaft is rotatably connected to the supporting sleeve.

[0014] By adopting the above technical solution, a frame is designed, in which the columns support the supporting platform, the transverse support beams support and fix the supporting sleeves, and the supporting sleeves support and fix the rotating shaft, so that the rotating shaft can support and fix the mounting plate and the dial in the process of driving the mounting plate to rotate, thereby ensuring the normal operation of the dial.

[0015] In a specific possible implementation scheme, the dial includes an upper toothed disc, a lower toothed disc and a plurality of vertical rods, wherein the plurality of vertical rods are fixedly arranged between the upper toothed disc and the lower toothed disc, one end of the vertical rod is fixedly connected to the top wall of the lower toothed disc, and the other end is fixedly connected to the bottom wall of the upper toothed disc, and the upper toothed disc is coaxially arranged with the lower toothed disc;

[0016] A plurality of arc-shaped teeth are evenly arranged in the circumference of the upper gear plate and the lower gear plate, and the arc-shaped teeth of the upper gear plate and the arc-shaped teeth of the lower gear plate are overlapped in the vertical projection direction.

[0017] By adopting the above technical solution, a dial is designed, and multiple vertical rods are arranged between the upper toothed disc and the lower toothed disc. When filling the glass bottle, the glass bottle is engaged in the arc-shaped teeth of the upper toothed disc and the lower toothed disc, the upper toothed disc engages and limits the upper end of the glass bottle, and the lower toothed disc engages and limits the lower end of the glass bottle, thereby preventing the glass bottle from shaking and deviating in the process of following the rotation of the dial, resulting in filling errors; at the same time, the arc-shaped teeth of the upper toothed disc and the arc-shaped teeth of the lower toothed disc are overlapped in the vertical projection direction, and the arc-shaped teeth can achieve the engagement of the upper and lower ends of the glass bottle at the same time, thereby achieving the engagement and positioning of the glass bottle.

[0018] In a specific possible implementation manner, the inner wall contour of the arc-shaped teeth matches the body of the glass bottle.

[0019] By adopting the above technical solution, the inner wall contour of the arc-shaped teeth is matched with the body of the glass bottle, which is convenient for improving the fixing effect of the glass bottle and avoiding shaking in the arc-shaped teeth when the glass bottle is moved by the dial, resulting in deviation in the positioning position of the glass bottle under the filling machine, affecting the filling quality.

[0020] In a specific possible implementation manner, the top wall of the lower toothed disc is fixedly connected to the top wall of the mounting disc, and the lower toothed disc is coaxially arranged with the mounting disc.

[0021] By adopting the above technical solution, the lower toothed disc is fixedly arranged on the top wall of the mounting disc, and the mounting disc supports the lower toothed disc, and then supports the dial. When the mounting disc rotates with the rotating shaft, the dial rotates synchronously with the mounting disc, which facilitates the engagement and positioning of the dial on the glass bottle.

[0022] In a specific possible implementation manner, a center hole is formed on both the upper toothed disc and the lower toothed disc, and the center hole is coaxially arranged with the upper toothed disc or the lower toothed disc.

[0023] By adopting the above technical solution, the central hole is set, which is more economical in material use and can significantly reduce the overall weight of the dial, which not only reduces the production cost, but also helps to reduce the inertia of the dial mechanism during operation and improve the response speed and stability of the system.

[0024] In a specific implementation scheme, the driving assembly includes a motor bracket, a driving motor, a driving gear, a transmission gear and a driven gear;

[0025] The motor bracket is fixedly arranged on the side wall of the column away from the end of the mounting plate, and the motor bracket is fixedly connected to the plurality of columns, the drive motor is fixedly installed on the motor bracket, and the driving gear is coaxially fixedly connected to the output shaft of the drive motor;

[0026] The driven gear is fixedly mounted on the bottom wall of the transverse support beam, and the driven gear is rotatably connected to the bottom wall of the transverse support beam, and one side of the transmission gear is meshed with the driving gear;

[0027] The transmission gear is fixedly arranged at one end of the rotating shaft below the supporting platform, and the transmission gear is coaxially fixedly connected with the rotating shaft, and the other side of the transmission gear is meshed with the driven gear.

[0028] By adopting the above technical solution, when it is necessary to position the glass bottle for filling, the drive motor is started, and the output shaft of the drive motor drives the active gear to rotate, the active gear drives the transmission gear to rotate, the transmission gear drives the driven gear to rotate, and the driven gear is fixedly connected to the rotating shaft, so that the rotating shaft rotates synchronously with the driven gear, so that the rotating shaft drives the mounting plate and the dial to rotate, so that the dial can accurately move the glass bottle to the bottom of the filling machine for accurate positioning.

[0029] In a specific possible implementation scheme, it further includes a guardrail, which is configured as an arc segment, and is fixedly connected to the edge of the top wall of the support platform, and the center of the guardrail coincides with the center of the support platform, and the glass bottle is disposed between the arc-shaped teeth and the inner wall of the guardrail;

[0030] One end of the guardrail is close to the conveyor belt, and the other end is close to the filling machine.

[0031] By adopting the above technical solution, the guardrail is set, and when the glass bottle is transferred from the conveyor belt to the supporting platform, the glass bottle is clamped between the arc teeth and the guardrail, which improves the limiting and fixing effect of the glass bottle and facilitates the accurate positioning of the glass bottle.

[0032] In a specific possible implementation manner, it further includes a positioning component, the positioning component includes a position sensor, the position sensor is arranged on the bottom wall of the supporting platform, and the position sensor is electrically connected to the driving motor.

[0033] By adopting the above technical solution, a position sensor is set. When the glass bottle is transported to the bottom of the filling machine by the dial, the position sensor sends a signal to the drive motor, and the drive motor stops rotating, so that the glass bottle is accurately positioned under the filling head, so that the filling head can accurately fill the glass bottle.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. The inspection hole set on the mounting plate is convenient for observing the operation of the drive assembly under the mounting plate. When the dial mechanism is misplaced, the operator can easily inspect the drive assembly under the mounting plate through the inspection hole. At the same time, the inspection hole can provide better ventilation effect, which helps to reduce the temperature of the drive assembly during operation and extend the service life of the dial mechanism.

[0036] 2. The center hole set on the upper and lower gear discs is more economical in material use and can significantly reduce the overall weight of the dial, which not only reduces production costs, but also helps to reduce the inertia of the dial mechanism during operation and improve the response speed and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The present invention is a schematic diagram of the overall structure of a dial mechanism for a glass bottle according to an embodiment.

[0038] Figure 2 It is a schematic diagram of the overall structure of a dial mechanism for a glass bottle from another perspective in an embodiment.

[0039] Figure 3 The present invention is a structural schematic diagram of a dial of a dial mechanism for a glass bottle according to an embodiment.

[0040] Figure 4 The present invention is a schematic structural diagram of a driving assembly of a dial mechanism for a glass bottle according to an embodiment.

[0041] Description of the drawings: 1. Dial; 11. Upper gear plate; 12. Lower gear plate; 13. Vertical pole; 14. Arc teeth; 15. Center hole; 2. Mounting plate; 21. Inspection hole; 3. Drive assembly; 31. Motor bracket; 32. Drive motor; 33. Driving gear; 34. Transmission gear; 35. Driven gear; 4. Rotating shaft; 5. Support platform; 6. Frame; 61. Vertical column; 62. Horizontal support beam; 63. Support sleeve; 7. Guardrail; 8. Positioning assembly; 81. Position sensor. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-4 This application is described in further detail.

[0043] The embodiment of the present application discloses a dial mechanism for a glass bottle.

[0044] Reference Figure 1 A dial mechanism for a glass bottle includes a dial 1, a mounting plate 2, a driving assembly 3, a rotating shaft 4, a supporting platform 5, a guardrail 7 and a frame 6; the supporting platform 5 is fixedly arranged on the top wall of the frame 6, the rotating shaft 4 passes through the frame 6 and the supporting platform 5, the rotating shaft 4 is located above the frame 6 and is fixedly connected to the mounting plate 2 at one end, the dial 1 is fixedly installed on the top wall of the mounting plate 2, the driving assembly 3 is fixedly arranged on the frame 6, and the guardrail 7 is fixedly connected to the supporting platform 5.

[0045] Reference Figure 2 The frame 6 includes a column 61, a transverse support beam 62 and a support sleeve 63. The plurality of columns 61 are fixedly arranged on the bottom wall of the support platform 5 to support the support platform 5. The support sleeve 63 is arranged at the center of the frame 6. One end of the plurality of transverse support beams 62 is fixedly connected to the end of the column 61 close to the mounting plate 2, and the other end is fixedly connected to the support sleeve 63. The extension lines of the length direction of the plurality of transverse support beams 62 coincide with the center of the support sleeve 63. The rotating shaft 4 passes through the central axis of the support sleeve 63. The rotating shaft 4 rotates with the support sleeve 63. The support platform 5 is arranged in a ring shape, the rotating shaft 4 passes through the support platform 5, a conveyor belt is arranged on one side of the support platform 5, and a filling machine is arranged on the other side; the end of the rotating shaft 4 located above the support platform 5 is fixedly connected to the mounting plate 2, the mounting plate 2 and the rotating shaft 4 are arranged coaxially, and a plurality of inspection holes 21 are evenly opened on the mounting plate 2, and the plurality of inspection holes 21 are evenly distributed along the circumference of the top wall of the mounting plate 2. When the dial mechanism has a fault such as misalignment, the operator can directly inspect the dial mechanism through the inspection hole 21, avoiding the removal of the dial 1 and improving the inspection efficiency.

[0046] Reference Figure 2 The bottom wall of the supporting platform 5 is provided with a positioning assembly 8, which includes a positioning sensor. The positioning assembly 8 is electrically connected to the driving motor 32. When the glass bottle moves to the bottom of the filling machine, the position sensor 81 sends a signal, the dial 1 stops rotating, and the filling head fills the glass bottle.

[0047] Reference Figure 3 The dial 1 includes an upper toothed disc 11, a lower toothed disc 12, and a plurality of vertical rods 13, wherein the plurality of vertical rods 13 are fixedly arranged between the upper toothed disc 11 and the lower toothed disc 12, one end of the vertical rod 13 is fixedly connected to the top wall of the lower toothed disc 12, and the other end is fixedly connected to the bottom wall of the upper toothed disc 11, the upper toothed disc 11 and the lower toothed disc 12 are coaxially arranged, and the plurality of vertical rods 13 are evenly distributed along the circumference of the top wall of the lower toothed disc 12; a plurality of arc-shaped teeth 14 are evenly arranged on the circumference of the upper toothed disc 11 and the lower toothed disc 12, and the arc-shaped teeth 14 of the upper toothed disc 11 and the arc-shaped teeth 14 of the lower toothed disc 12 are vertically aligned. The upper and lower toothed discs 11 and 12 are overlapped in the projection direction, and the inner wall contour of the arc-shaped teeth 14 matches the bottle body of the glass bottle; the top wall of the lower toothed disc 12 is fixedly connected to the top wall of the mounting disc 2, and the lower toothed disc 12 is coaxially arranged with the mounting disc 2; a center hole 15 is provided on both the upper and lower toothed discs 11 and 12, and the center hole 15 is coaxially arranged with the upper and lower toothed discs 11 and 12, and the center hole 15 provided on the upper and lower toothed discs 11 and 12 can reduce the overall weight of the dial 1, thereby reducing the production cost, and at the same time reduce the inertia of the rotation of the dial 1, so as to improve the positioning accuracy of the glass bottle.

[0048] Reference Figure 1 and Figure 3The shape of the guardrail 7 is set to be an arc segment, the guardrail 7 is fixedly connected to the edge of the top wall of the supporting platform 5, the center of the guardrail 7 coincides with the center of the supporting platform 5, and the outer wall of the guardrail 7 has the same curvature as the outer wall of the supporting platform 5. The glass bottle is set between the arc teeth 14 and the inner wall of the guardrail 7. One end of the guardrail 7 is close to the conveyor belt, and the other end is close to the filling machine. When the glass bottle needs to be transferred from the conveyor belt to the bottom of the filling machine for positioning, the guardrail 7 limits the outer side of the glass bottle to prevent the glass bottle from shaking and shifting during transportation, thereby improving the positioning accuracy of the glass bottle.

[0049] Reference Figure 4 The driving assembly 3 includes a motor bracket 31, a driving motor 32, a driving gear 33, a transmission gear 34 and a driven gear 35; the motor bracket 31 is fixedly arranged on the side wall of the column 61 away from the end of the mounting plate 2, and the motor bracket 31 is fixedly connected to multiple columns 61, the driving motor 32 is fixedly installed on the motor bracket 31, and the driving gear 33 is coaxially fixedly connected to the output shaft of the driving motor 32; the driven gear 35 is fixedly installed on the bottom wall of the transverse support beam 62, and the driven gear 35 is rotatably connected to the bottom wall of the transverse support beam 62, and one side of the transmission gear 34 is meshed with the driving gear 33; the transmission gear 34 is fixedly arranged on the end of the rotating shaft 4 located below the supporting platform 5, and the transmission gear 34 is coaxially fixedly connected to the rotating shaft 4, and the other side of the transmission gear 34 is meshed with the driven gear 35.

[0050] The implementation principle of a dial mechanism for glass bottles of the present application is as follows: when the conveyor belt conveys the glass bottle to near the supporting platform 5, the driving motor 32 is started, and the output shaft of the driving motor 32 drives the driving gear 33 to rotate, the driving gear 33 drives the transmission gear 34 to rotate, and the transmission gear 34 drives the driven gear 35 to rotate, and the driven gear 35 is fixedly connected with the rotating shaft 4, so that the rotating shaft 4 rotates synchronously with the driven gear 35, the rotating shaft 4 drives the mounting plate 2 to rotate, and the dial 1 fixedly arranged on the mounting plate 2 rotates synchronously, when the arc-shaped teeth 14 on the dial 1 rotate to approach the glass bottle, the conveyor belt transfers the glass bottle into the arc-shaped teeth 14, as the dial 1 continues to rotate, the arc-shaped teeth 14 drives the glass bottle to move onto the supporting platform 5, and the guardrail 7 limits the glass bottle, when the dial 1 drives the glass bottle to move to the bottom of the filling machine, the position sensor 81 sends a signal, the dial 1 stops rotating, and the filling head fills the glass bottle, after the filling is completed, the dial 1 continues to rotate, and the glass bottle is driven to the next section.

[0051] When the dial 1 is misaligned, the dial mechanism stops working, and the operator checks and adjusts the drive assembly 3 and the position sensor 81 below the mounting plate 2 through the center hole 15 and the inspection hole 21 .

[0052] 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 dial mechanism for a glass bottle, characterized in that: The invention comprises a dial (1), a mounting plate (2), a driving assembly (3), a rotating shaft (4), a supporting platform (5) and a frame (6); the supporting platform (5) is fixedly arranged on the top wall of the frame (6); the supporting platform (5) is arranged in a ring shape; the rotating shaft (4) passes through the supporting platform (5) along the central axis direction of the supporting platform (5); The end of the rotating shaft (4) located above the supporting platform (5) is fixedly connected to the mounting plate (2); the mounting plate (2) and the rotating shaft (4) are coaxially arranged; the dial (1) is fixedly connected to the mounting plate (2); and a plurality of inspection holes (21) are provided on the mounting plate (2); The driving assembly (3) is fixedly arranged below the supporting platform (5), and the driving assembly (3) is used to drive the rotating shaft (4) to rotate; A conveyor belt is arranged on one side of the supporting platform (5), and a filling machine is arranged on the other side.

2. A dial mechanism for a glass bottle according to claim 1, characterized in that: The frame (6) comprises a column (61), a transverse support beam (62) and a support sleeve (63), wherein a plurality of the columns (61) are fixedly arranged on the bottom wall of the support platform (5), and the support sleeve (63) is arranged at the center of the frame (6), one end of the plurality of transverse support beams (62) is fixedly connected to one end of the column (61) close to the mounting plate (2), and the other end is fixedly connected to the support sleeve (63), and the extension lines of the length direction of the plurality of transverse support beams (62) coincide with the center of the support sleeve (63); The rotating shaft (4) is arranged to pass through the central axis of the supporting sleeve (63), and the rotating shaft (4) is rotatably connected to the supporting sleeve (63).

3. A dial mechanism for a glass bottle according to claim 1, characterized in that: The dial (1) comprises an upper toothed disc (11), a lower toothed disc (12) and a plurality of vertical rods (13); the plurality of vertical rods (13) are fixedly arranged between the upper toothed disc (11) and the lower toothed disc (12); one end of the vertical rod (13) is fixedly connected to the top wall of the lower toothed disc (12); and the other end of the vertical rod (13) is fixedly connected to the bottom wall of the upper toothed disc (11); the upper toothed disc (11) and the lower toothed disc (12) are coaxially arranged; A plurality of arc-shaped teeth (14) are evenly arranged in the circumferential direction of the upper toothed disc (11) and the lower toothed disc (12); the arc-shaped teeth (14) of the upper toothed disc (11) and the arc-shaped teeth (14) of the lower toothed disc (12) overlap in vertical projection direction.

4. A dial mechanism for a glass bottle according to claim 3, characterized in that: The inner wall profile of the arc-shaped teeth (14) fits the body of the glass bottle.

5. A dial mechanism for a glass bottle according to claim 3, characterized in that: The top wall of the lower toothed disc (12) is fixedly connected to the top wall of the mounting disc (2), and the lower toothed disc (12) and the mounting disc (2) are coaxially arranged.

6. A dial mechanism for a glass bottle according to claim 3, characterized in that: The upper toothed disc (11) and the lower toothed disc (12) are both provided with a center hole (15), and the center hole (15) is coaxially arranged with the upper toothed disc (11) or the lower toothed disc (12).

7. A dial mechanism for a glass bottle according to claim 2, characterized in that: The driving assembly (3) comprises a motor bracket (31), a driving motor (32), a driving gear (33), a transmission gear (34) and a driven gear (35); The motor bracket (31) is fixedly arranged on a side wall of the column (61) away from one end of the mounting plate (2), and the motor bracket (31) is fixedly connected to a plurality of the columns (61), the drive motor (32) is fixedly installed on the motor bracket (31), and the driving gear (33) is coaxially fixedly connected to an output shaft of the drive motor (32); The driven gear (35) is fixedly mounted on the bottom wall of the transverse support beam (62), and the driven gear (35) is rotatably connected to the bottom wall of the transverse support beam (62), and one side of the transmission gear (34) is meshed with the driving gear (33); The transmission gear (34) is fixedly arranged on one end of the rotating shaft (4) below the supporting platform (5), and the transmission gear (34) is coaxially fixedly connected to the rotating shaft (4), and the other side of the transmission gear (34) is meshed with the driven gear (35).

8. The dial mechanism for a glass bottle according to claim 3, characterized in that: It also includes a guardrail (7), the guardrail (7) is arranged as an arc segment, the guardrail (7) is fixedly connected to the edge of the top wall of the supporting platform (5), and the center of the guardrail (7) coincides with the center of the supporting platform (5), and the glass bottle is arranged between the arc-shaped teeth (14) and the inner wall of the guardrail (7); One end of the guardrail (7) is close to the conveyor belt, and the other end is close to the filling machine.

9. A dial mechanism for a glass bottle according to claim 7, characterized in that: It also includes a positioning component (8), the positioning component (8) includes a position sensor (81), the position sensor (81) is arranged on the bottom wall of the supporting platform (5), and the position sensor (81) is electrically connected to the driving motor (32).

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