Intelligent Buffer Lifting Column
By designing an intelligent buffering structure on the lifting column, using the reset spring and annular elastic airbag to provide all-round buffering, the damage problem of the lifting column during emergency stop and collision is solved, and the goal of more efficient buffering effect and reducing maintenance costs is achieved.
Patent Information
- Application Number
- CN202411944673.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-04-08
AI Technical Summary
When the existing lift column is intercepted, some vehicles are prone to collision with the lift column when the brakes of the existing lift column are stopped, resulting in damage to the vehicle and lift column, increasing maintenance costs.
An intelligent buffer type lifting column is designed, adopting a combined structure of embedded cylinder, lifting column and hydraulic rod. The top of the lifting column is connected to the functional part, and an image sensor, communication module and control module are provided inside. It is equipped with a first and second elastic buffering structure, including a return spring and an annular elastic airbag, providing a comprehensive buffering effect.
In the event of a vehicle collision, the intelligent buffer type lifting column can provide a buffering effect from above and below at the same time, avoid damage from top impact, significantly reduce the degree of damage to the lifting column and vehicle, reduce maintenance costs, and improve system stability through power supply through solar panels.
Smart Images
Figure CN119777291A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of lifting columns, and in particular relates to an intelligent buffer type lifting column. Background Art
[0002] Lifting bollards, also known as lifting ground bollards, lifting road bollards, anti-collision road bollards, hydraulic lifting bollards, isolation bollards, etc., are widely used in urban transportation, military and national important agency gates and surrounding areas, pedestrian streets, highway toll stations, airports, schools, banks, large clubs, parking lots and many other occasions. By restricting passing vehicles, they effectively ensure the traffic order and the safety of major facilities and places. When the existing lifting bollards are lifted and intercepted, some vehicles are prone to collide with the lifting bollards due to sudden braking. In this case, on the one hand, the vehicle is damaged, and on the other hand, the vehicle collides with the lifting bollard rigidly, causing damage to the lifting bollard body, increasing the maintenance costs of both parties. The Chinese patent application number 2020200565239 discloses an anti-collision lifting column, including an embedded base, into which a lifting column body is inserted; the lifting column body includes a support part and an anti-collision buffer part, a buffer groove is arranged in the support part, a buffer rod inserted into each buffer groove is installed on the side of the anti-collision buffer part, a buffer spring is sleeved on the buffer rod, and a reinforcing ring is installed on the top of the embedded base; The above scheme has an anti-collision buffer part, which moves inwards for a certain distance when subjected to force, and has a good buffering effect, providing good buffering protection for the column and the vehicle, reducing damage to both. However, the anti-collision buffer part can only buffer one side, and if the vehicle hits the top of the lifting column, it is still difficult to play a buffering role because there is a slide groove on the top. Summary of the invention
[0003] In order to solve the above problems, the present invention provides an intelligent buffer-type lifting column, comprising an embedded cylinder, a lifting column and a hydraulic rod, the embedded cylinder is embedded in the ground, the lifting column is telescopically arranged in the embedded cylinder, the hydraulic rod is arranged in the embedded cylinder and the output end above the hydraulic rod is against the lifting column, the hydraulic rod drives the lifting column to move up and down, the top of the lifting column is connected with a functional part, the interior of the lifting column is a hollow structure, the inner side of the functional part is provided with an image sensor, a communication module and a control module, an observation port is provided around the functional part, a first elastic buffer structure is provided around the top of the hydraulic rod on the upper inner side of the lifting column, and a second elastic buffer structure is provided around the lifting column on the inner side of the top of the embedded cylinder, the first elastic buffer structure and the second elastic buffer structure provide buffering for the displacement of the lifting column and restore the vertical state through elastic force from above and below respectively.
[0004] Preferably, the first elastic buffer structure includes an outer fixed ring and an inner fixed ring, the outer side of the outer fixed ring is fixed on the inner wall of the top of the lifting column, the inner side of the outer fixed ring is connected to at least two return springs, the return springs are connected to the outer side of the inner fixed ring, and the output end of the hydraulic rod passes through the inner side of the inner fixed ring and is connected to the inner fixed ring.
[0005] Preferably, the second elastic buffer structure is an annular elastic airbag, which is arranged on the inner side of the top of the embedded tube and surrounds the lifting column.
[0006] Preferably, an air pump is provided inside the embedded tube, the air pump is connected to an air pipe, the air pipe is communicated with the annular elastic airbag, the control module controls the air pump to inflate and deflate air, and the air pump is connected to an internal power supply.
[0007] Preferably, at least three gas pipes are provided, connecting parts are provided between the gas pipes, air cavities are provided inside the connecting parts, and the air cavities are connected to the gas pipes.
[0008] Preferably, the functional part includes a top cover, an outer cylinder, a fixed bracket and a base, the top of the top cover is connected to a first buffer pad, the bottom of the top cover is connected to a cylindrical glass cover, the top cover is installed above the outer cylinder and the outer cylinder is sleeved on the outside of the cylindrical glass cover, light-transmitting grooves are evenly opened on the circumferential surface of the outer cylinder, the observation port is located in the light-transmitting grooves, the bottom of the outer cylinder is connected to the base, and the base is connected to the fixed bracket, solar panels are arranged around the fixed bracket, the fixed bracket and the solar panels are embedded in the cylindrical glass cover, the graphic sensor is arranged at the bottom of the top cover, and the communication module and the control module are arranged on the inner side of the fixed bracket.
[0009] Preferably, a second buffer pad is provided at the bottom of the embedded tube, and the bottom of the hydraulic rod is arranged above the second buffer pad.
[0010] Preferably, a lifting buffer mechanism is provided at the bottom of the embedded tube, and the lifting buffer mechanism includes a buffer seat, a first buffer channel is provided in the middle of the buffer seat, a first buffer spring is provided in the first buffer channel, a first buffer piston seat is provided above the first buffer spring, the top of the first buffer piston seat is connected to the bottom of the hydraulic rod, and an exhaust hole is provided at the bottom of the first buffer channel.
[0011] Preferably, a buffer cylinder is provided above the bottom of the buffer seat, a second buffer channel is provided inside the buffer cylinder, a second buffer piston seat is provided in the second buffer channel, a second buffer spring is connected above the second buffer piston seat, the bottom of the second buffer channel is connected to the exhaust hole, and a pressure relief hole is provided on the top of the buffer cylinder. Preferably, an alarm is provided on the inner side of the functional part, and a spherical push switch is provided on the bottom of the functional part, and the spherical push switch is electrically connected to the alarm.
[0012] The advantages of the present invention are: 1. In this solution, a first elastic buffer structure is arranged on the upper inner side of the lifting column, and a second elastic buffer structure is arranged on the inner side of the top of the embedded tube. When the lifting column is tilted by a vehicle collision, it can provide a buffering effect from both the top and the bottom, thereby avoiding damage caused by the vehicle hitting the top.
[0013] 2. The second elastic buffer structure in this solution adopts an annular elastic airbag, which can surround the lifting column in all directions and provide a uniform buffering effect for the lifting column. When a vehicle hits the lifting column, the airbag can quickly absorb and disperse the impact force, reducing damage to the lifting column and the vehicle.
[0014] 3. The functional part of this solution is self-sufficient in energy through the combination of solar panels and built-in power supply. The solar panel can absorb solar energy to power the built-in power supply, thereby ensuring the normal operation of components such as the image sensor, communication module and control module. This design not only reduces the dependence on external power supply, but also improves the stability and reliability of the entire system.
[0015] 4. In this solution, a first buffer pad and a second buffer pad are provided, which can effectively relieve the downward pressure of the car, thereby reducing the damage to the car and the lifting column and protecting driving safety.
[0016] 5. This solution achieves a more efficient and stable buffering effect by introducing a double buffering mechanism, including a first buffering spring and a first buffering piston seat in the first buffering channel, and a second buffering piston seat in the second buffering channel and a gas compression buffer in the buffer cylinder, which significantly reduces the vibration and noise of the lifting column when it is impacted, enhances stability, and reduces failures and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is the overall structure diagram of the present invention.
[0018] Figure 2 It is the structural diagram of the embedded tube of the present invention.
[0019] Figure 3 It is a structural diagram of the functional parts of the present invention.
[0020] Figure 4 It is a cross-sectional structural diagram of the present invention.
[0021] Figure 5 This is a diagram of the impact state of the present invention.
[0022] Figure 6 This is a schematic diagram of the first elastic buffer structure of the present invention.
[0023] Figure 7 This is another structural cross-sectional view of the second elastic buffer structure of the present invention.
[0024] Figure 8 for Figure 7 Top section of the middle embedded tube.
[0025] Fig. 9 It is a schematic diagram of the second elastic buffer structure of the present invention.
[0026] Fig.10 It is a cross-sectional schematic diagram of the second elastic buffer structure of the present invention.
[0027] In the figure: 1 embedded cylinder, 2 lifting column, 3 hydraulic rod, 4 functional part, 5 image sensor, 6 communication module, 7 control module, 8 observation port, 9 outer fixing ring, 10 inner fixing ring, 11 reset spring, 12 annular elastic airbag, 13 air pump, 14 air pipe, 15 connecting part, 16 top cover, 17 outer cylinder, 18 fixing bracket, 19 base, 20 first buffer pad, 21 cylindrical glass cover, 22 light transmission groove, 23 solar cell panel, 24 second buffer pad, 25 buffer seat, 26 first buffer channel, 27 first buffer spring, 28 first buffer piston seat, 29 exhaust hole, 30 buffer cylinder, 31 second buffer channel, 32 second buffer piston seat, 33 pressure relief hole, 34 alarm, 35 spherical push switch. DETAILED DESCRIPTION
[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0029] Embodiment 1, as Figure 1-2 As shown, an intelligent buffer-type lifting column comprises an embedded tube 1, a lifting column 2 and a hydraulic rod 3. The embedded tube 1 is embedded in the ground, and the lifting column 2 is telescopically arranged in the embedded tube 1. The hydraulic rod 3 is arranged in the embedded tube 1 and the output end above the hydraulic rod 3 is against the lifting column 2. The hydraulic rod 3 drives the lifting column 2 to move up and down. The top of the lifting column 2 is connected to a functional part 4. The interior of the lifting column 2 is a hollow structure. The lifting column 2 will drive the functional part 4 to move up and down at the same time. The top and middle axial holes of the embedded tube 1 can simply limit the lifting column 2.
[0030] Combination Figure 3 An image sensor 5, a communication module 6 and a control module 7 are provided on the inner side of the functional part 4, and an observation port 8 is provided around the functional part 4. The image sensor 5 can transmit nearby image information to the control module 7 through the communication module 6 through the observation port 8.
[0031] Combination Figure 4-5 A first elastic buffer structure is provided around the top of the hydraulic rod 3 on the inner side of the lifting column 2, and a second elastic buffer structure is provided around the lifting column 2 on the inner side of the top of the embedded tube 1. The first elastic buffer structure and the second elastic buffer structure provide buffering for the displacement of the lifting column 2 and restore the vertical state through elastic force from above and below respectively. Figure 6 The first elastic buffer structure includes an outer fixing ring 9 and an inner fixing ring 10. The outer side of the outer fixing ring 9 is fixed on the inner side wall of the top of the lifting column 2. At least two reset springs 11 are connected to the inner side of the outer fixing ring 9. The reset spring 11 is connected to the outer side of the inner fixing ring 10. The output end of the hydraulic rod 3 passes through the inner side of the inner fixing ring 10 and is connected to the inner fixing ring 10. When the vehicle brakes and stops suddenly and collides with the lifting column 2, the lifting column 2 tilts, while the lifting column 2 remains fixed. At this time, the reset spring 11 can have a corresponding buffering effect. The reset spring 11 on one side close to the impact surface will shrink, while the reset spring 11 on the other side will stretch. The elastic action of the reset springs 11 on both sides can absorb the corresponding collision impact force. The number of reset springs 11 can be two, three or four. If there are three, the three reset springs 11 are evenly spaced 120°. If there are four, the four reset springs 11 are evenly spaced 90°. Multiple reset springs 11 can have a better buffering effect. When the car moves backward away from the collision position, the return spring 11 is reset, thereby driving the lifting column 2 to be reset.
[0032] The second elastic buffer structure is an annular elastic airbag 12, which is arranged on the inner side of the top of the embedded tube 1 and surrounds the lifting column 2. The function of the second elastic buffer structure is the same as that of the first elastic buffer structure, which is to provide buffering for the lifting column 2 and reset the lifting column 2. The second elastic buffer structure adopts the structure of an elastic airbag. The annular elastic airbag 12 can surround the lifting column 2 in all directions, providing a uniform buffering effect for the lifting column 2. When a vehicle hits the lifting column 2, the airbag can quickly absorb and disperse the impact force, reducing the damage to the lifting column 2 and the vehicle.
[0033] An air pump 13 is arranged inside the embedded tube 1, and the air pump 13 is connected to an air pipe 14, and the air pipe 14 is connected to the annular elastic airbag 12. The control module 7 controls the air pump 13 to charge and discharge, and the air pump 13 is connected to an internal power supply. Under normal conditions, the gas inside the annular elastic airbag 12 should be two-thirds of the required gas under the limit expansion state, so that the over-expanded annular elastic airbag 12 can be prevented from being difficult to play a buffering role. When the lifting column 2 needs to be reset after the expansion, the annular elastic airbag 12 should be inflated by the air pump 13 to ensure that the lifting column 2 is accurately reset from the bottom. The control module 7 accurately controls the charging and discharging of the air pump 13, and the precise adjustment of the gas amount inside the annular elastic airbag 12 can be achieved. This precise control allows the airbag to maintain an appropriate degree of expansion under normal conditions, and it will not be difficult to play a buffering role due to excessive expansion, nor will it be unable to effectively absorb impact force due to insufficient expansion. The introduction of the air pump 13 and the internal power supply makes the entire system have stronger stability and reliability. Powered by a power source, the air pump 13 can work continuously and stably to provide the annular elastic airbag 12 with the required amount of gas.
[0034] Combination Figure 1-2 At least three gas pipes 14 are provided, and connecting parts 15 are provided between the gas pipes 14. An air cavity is provided inside the connecting part 15, and the air cavity is connected to the gas pipe 14. Arranging multiple gas pipes 14 can make the annular elastic airbag 12 expand quickly and evenly. The function of the connecting part 15 is to make the middle of multiple gas pipes 14 connected, so that when the middle of a gas pipe 14 is blocked, the gas inside another gas pipe 14 can enter the gas pipe 14 again through the connecting part 15 and bypass the blockage point. There is at least one connecting part 15, and preferably three connecting parts can be provided.
[0035] Combination Figure 3The functional part 4 includes a top cover 16, an outer column 17, a fixed bracket 18 and a base 19. The top of the top cover 16 is connected to a first buffer pad 20. The first buffer pad 20 provides additional buffer protection for the top of the lifting column 2, reducing the damage to the lifting column 2 and the vehicle when the vehicle collides. The bottom of the top cover 16 is connected to a cylindrical glass cover 21. The top cover 16 is installed above the outer column 17 and the outer column 17 is sleeved on the outside of the cylindrical glass cover 21. Light-transmitting grooves 22 are evenly opened on the circumferential surface of the outer column. The observation port 8 is located in the light-transmitting grooves 22. The glass cover is used to prevent dust from entering. The bottom of the outer column 17 is connected to the base 19, and the base 19 is connected to the fixed bracket 18. Solar panels 23 are arranged around the fixed bracket 18. The fixed bracket 18 and the solar panels 23 are embedded in the cylindrical glass cover 21. The image sensor is arranged at the bottom of the top cover 16, and the communication module 6 and the control module 7 are arranged on the inner side of the fixed bracket 18. A solar cell is also provided inside the fixing bracket 18 as a built-in power source, and the solar panel 23 can absorb solar energy to power the built-in power source. The image sensor 5 is a spherical camera, and the observation port 8 can be convenient for light transmission and also convenient for the image sensor to penetrate the surrounding situation. The combination of the solar panel 23 and the built-in power source enables the functional part 4 to have the ability of energy self-sufficiency. The solar panel 23 can absorb solar energy to power the built-in power source, thereby ensuring the normal operation of components such as the image sensor, the communication module 6 and the control module 7. This design not only reduces the dependence on the external power supply, but also improves the stability and reliability of the entire system.
[0036] Combination Figure 4 A second buffer pad 24 is provided at the bottom of the embedded cylinder 1, and the bottom of the hydraulic rod is arranged above the second buffer pad 24. When the lifting column 2 is extended and retracted, and the car passes over the top of the lifting column 2, if the lifting column 2 is not completely retracted, the downward pressure of the car can be relieved by the second buffer pad 24. The second buffer pad 24 can absorb part of the impact force and reduce the stress on the bottom of the lifting column 2, thereby extending the service life of the lifting column 2 and reducing the maintenance and replacement costs.
[0037] Combination Figure 7-8 The second elastic buffer structure in this embodiment may also be the same as the first elastic buffer structure, both of which use springs for buffering.
[0038] Embodiment 2, combined Figure 9-10, this embodiment has the same parts as embodiment 1, and the difference of this embodiment is that the bottom of the embedded tube 1 uses a lifting buffer mechanism to replace the second buffer pad 24, and the lifting buffer mechanism includes a buffer seat 25, a first buffer channel 26 is provided in the middle of the buffer seat 25, a first buffer spring 27 is provided in the first buffer channel 26, a first buffer piston seat 28 is provided above the first buffer spring 27, the top of the first buffer piston seat 28 is connected to the bottom of the hydraulic rod, and an exhaust hole 29 is provided at the bottom of the first buffer channel 26. The lifting buffer mechanism provides a more efficient buffering effect through the combination of the first buffer spring 27 and the first buffer piston seat 28. When the hydraulic rod is subjected to pressure, the first buffer spring 27 can absorb and disperse the impact force, while the first buffer piston seat 28 can ensure the smooth progress of the buffering process. Compared with the single second buffer pad 24, this design can more effectively reduce the vibration and noise of the lifting column 2 when it is impacted.
[0039] A buffer cylinder 30 is provided above the bottom of the buffer seat 25, a second buffer channel 31 is provided inside the buffer cylinder 30, a second buffer piston seat 32 is provided in the second buffer channel 31, a second buffer spring 34 is connected above the second buffer piston seat 32, the bottom of the second buffer channel 31 is connected to the exhaust hole 29, and a pressure relief hole 33 is provided on the top of the buffer cylinder 30. By respectively arranging the first buffer spring 27 and the second buffer piston seat 32 in the first buffer channel 26 and the second buffer channel 31, a double buffering effect is achieved. This design can more effectively absorb and disperse the impact force, further reduce the vibration and noise of the lifting column 2 when it is impacted, and improve the buffering performance. The design of the double buffer mechanism enhances the stability of the lifting column 2 during use. Even when subjected to a large impact force, the lifting column 2 can maintain a stable operation, reducing the failure and maintenance cost caused by the impact. When the lifting column 2 is subjected to pressure, the gas in the buffer cylinder 30 will be compressed and slowly discharged through the pressure relief hole 33. In this process, the compression and discharge of the gas can absorb part of the impact force and also play a buffering role.
[0040] An alarm 34 is provided on the inner side of the functional part 4, and a spherical push switch 36 is provided at the bottom of the functional part 4. The spherical push switch 36 is electrically connected to the alarm 34. When the lifting column 2 is tilted, the top of the hydraulic rod 3 is away from the spherical push switch 36, and the alarm 34 is triggered at this time to alert relevant personnel in time to pay attention and take corresponding measures.
[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An intelligent buffer lifting column, characterized in that: The invention comprises an embedded cylinder (1), a lifting column (2) and a hydraulic rod (3), wherein the embedded cylinder (1) is embedded in the ground, the lifting column (2) is telescopically arranged in the embedded cylinder (1), the hydraulic rod (3) is arranged in the embedded cylinder (1), and the output end of the hydraulic rod (3) is against the lifting column (2), the hydraulic rod (3) drives the lifting column (2) to move up and down, the top of the lifting column (2) is connected to a functional part (4), the interior of the lifting column (2) is a hollow structure, the inner side of the functional part (4) is provided with an image sensor (5), a communication module (6) and a control module (7), the functional part (4) is provided with an observation port (8) around the functional part (4), the upper inner side of the lifting column (2) is provided with a first elastic buffer structure around the top of the hydraulic rod (3), and the inner side of the top of the embedded cylinder (1) is provided with a second elastic buffer structure around the lifting column (2), the first elastic buffer structure and the second elastic buffer structure respectively provide buffering for the lifting column (2) to shift and restore the vertical state through elastic force from the upper and lower sides.
2. The intelligent buffer lifting column according to claim 1, characterized in that: The first elastic buffer structure comprises an outer fixing ring (9) and an inner fixing ring (10); the outer side of the outer fixing ring (9) is fixed on the inner side wall of the top of the lifting column (2); the inner side of the outer fixing ring (9) is connected to at least two return springs (11); the return springs (11) are connected to the outer side of the inner fixing ring (10); the output end of the hydraulic rod (3) passes through the inner side of the inner fixing ring (10) and is connected to the inner fixing ring (10).
3. The intelligent buffer lifting column according to claim 2, characterized in that: The second elastic buffer structure is an annular elastic airbag (12), and the annular elastic airbag (12) is arranged on the inner side of the top of the embedded tube (1) and surrounds the lifting column (2).
4. The intelligent buffer lifting column according to claim 3, characterized in that: An air pump (13) is arranged inside the embedded tube (1), the air pump (13) is connected to an air delivery pipe (14), the air delivery pipe (14) is in communication with the annular elastic air bag (12), the control module (7) controls the air pump (13) to inflate and deflate, and the air pump (13) is connected to an internal power supply.
5. The intelligent buffer lifting column according to claim 4, characterized in that: At least three gas delivery pipes (14) are provided, and connecting parts (15) are provided between the gas delivery pipes (14). An air cavity is provided inside the connecting part (15), and the air cavity is connected to the gas delivery pipe (14).
6. The intelligent buffer lifting column according to claim 5, characterized in that: The functional part (4) comprises a top cover (16), an outer column (17), a fixing bracket (18) and a base (19); the top of the top cover (16) is connected to a first buffer pad (20); the bottom of the top cover (16) is connected to a cylindrical glass cover (21); the top cover (16) is installed above the outer column (17) and the outer column (17) is sleeved on the outside of the cylindrical glass cover (21); light-transmitting grooves (22) are evenly formed on the circumferential surface of the outer column (17); the observation port (8) is located in the light-transmitting groove (22), the bottom of the outer column (17) is connected to the base (19), the base (19) is connected to the fixed bracket (18), the fixed bracket (18) is provided with solar panels (23) around it, the fixed bracket (18) and the solar panels (23) are embedded in the cylindrical glass cover (21), the graphic sensor is arranged at the bottom of the top cover (16), and the communication module (6) and the control module (7) are arranged on the inner side of the fixed bracket (18).
7. The intelligent buffer lifting column according to claim 6, characterized in that: A second buffer pad (24) is provided at the bottom of the embedded tube (1), and the bottom of the hydraulic rod (3) is arranged above the second buffer pad (24).
8. The intelligent buffer lifting column according to claim 6, characterized in that: A lifting buffer mechanism is provided at the bottom of the embedded cylinder (1), the lifting buffer mechanism comprising a buffer seat (25), a first buffer channel (26) is provided in the middle of the buffer seat (25), a first buffer spring (27) is provided in the first buffer channel (26), a first buffer piston seat (28) is provided above the first buffer spring (27), the top of the first buffer piston seat (28) is connected to the bottom of the hydraulic rod (3), and an exhaust hole (29) is provided at the bottom of the first buffer channel (26).
9. The intelligent buffer lifting column according to claim 8, characterized in that: A buffer cylinder (30) is provided above the bottom of the buffer seat (25), a second buffer channel (31) is provided inside the buffer cylinder (30), a second buffer piston seat (32) is provided in the second buffer channel (31), a second buffer spring (34) is connected above the second buffer piston seat (32), the bottom of the second buffer channel (31) is communicated with the exhaust hole (29), and a pressure relief hole (33) is provided at the top of the buffer cylinder (30).
10. The intelligent buffer lifting column according to claim 9, characterized in that: An alarm (34) is provided on the inner side of the functional part (4), and a spherical push switch (36) is provided on the bottom of the functional part (4); the spherical push switch (36) is electrically connected to the alarm (34).