A passenger flow guiding device for a station

Abstract

The utility model provides a kind of station passenger flow guiding device, comprising: mobile and stop unit is arranged in the lower part of guiding device along horizontal direction, and its below is provided with mobile part and stop part;Support unit is the pole-like structure arranged along vertical direction, and it is fixedly installed above plate-like structure;Guiding display unit is detachably installed in the upper end of support unit.The device shows the direction of direction-finding to passenger by guiding display unit, reduces the demand of passenger needing to ask the way;And guiding display unit is detachably installed in the setting of support unit, so that staff can replace guiding display unit according to specific station layout;Meanwhile, by setting mobile part and stop part, guiding device is adjusted position by mobile part, and guiding device is not moved at will in the process of use by adjusting the height of stop part.

Description

Technical Field

[0001] This utility model relates to the technical field of road signs, and in particular to a station passenger flow guidance device. Background Technology

[0002] With economic development, people's demand for travel has gradually increased, leading many to choose public transportation, especially trains and high-speed trains. However, some passengers are unfamiliar with the station environment and need to ask staff for directions. During holidays, the station's passenger flow increases significantly, but the number of staff is limited and cannot effectively meet all passengers' needs for directions, thus reducing the passenger travel experience. Utility Model Content

[0003] The main purpose of this utility model is to provide a station passenger flow guidance device to solve the problem that when the passenger flow at the train station increases significantly, the train attendants cannot effectively meet all the needs of passengers for directions.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A station passenger flow guidance device, the guidance device comprising:

[0006] The moving and stopping unit is a plate-shaped structure arranged in a horizontal direction, located at the lower part of the guide device, and a moving part and a stopping part are provided below the plate-shaped structure. The maximum height of the stopping part is greater than the height of the moving part, and the minimum height is less than the height of the moving part.

[0007] The support unit is a rod-shaped structure arranged in a vertical direction, and its lower end is fixedly installed above the plate-shaped structure.

[0008] A guide display unit is detachably installed on the upper end of the support unit.

[0009] As a further improvement of this utility model, the guide display unit includes a guide mounting base, a guide sign, and a flexible snap-fit ​​part;

[0010] The elastic snap-fit ​​part is fixedly disposed at the lower part of the guide mounting seat and snap-fitted to the top of the support unit;

[0011] The lower part of the guide mounting base abuts against the top of the support unit;

[0012] The guide sign is inserted vertically into the guide mounting base.

[0013] As a further improvement of this utility model, at least one insertion slot is provided on the guide mounting base along the vertical direction;

[0014] The horizontal cross-section of the insertion slot is T-shaped or dovetail-shaped;

[0015] The end of the guide sign is adapted to the insertion slot.

[0016] As a further improvement of this utility model, the top of the support unit is provided with a regular polygonal snap-fit ​​plate;

[0017] The elastic snap-fit ​​portion includes multiple elastic plates arranged in a vertical direction;

[0018] The plurality of elastic plates are evenly distributed at equal angles to the axis of the snap-fit ​​plate;

[0019] The number of elastic plates is the same as the number of sides of the snap-fit ​​plate;

[0020] The upper end of the elastic plate is fixedly installed on the lower part of the guide mounting seat, and a right-angled triangular snap-fit ​​block is provided at the lower end;

[0021] The snap-fit ​​plate is snapped between the plurality of elastic plates, and one right-angled side of the right-angled triangle of the snap-fit ​​block abuts against the lower side of the snap-fit ​​plate;

[0022] The lower part of the guide mounting base abuts against the upper part of the snap-fit ​​plate.

[0023] As a further improvement of this utility model, the upper part of the snap-fit ​​plate is provided with an elastic telescopic part that can extend and retract in the vertical direction;

[0024] The upper part of the elastic telescopic part abuts against the lower part of the guide mounting seat.

[0025] As a further improvement of this utility model, the elastic telescopic part includes an elastic end located at the upper part and a fixed end located at the lower part;

[0026] Both the elastic end and the fixed end are rectangular cap-shaped structures, and their openings are opposite to each other.

[0027] An arc-shaped spring sheet is provided between the elastic end and the fixed end;

[0028] The elastic end abuts against the lower part of the guide mounting seat;

[0029] The fixed end is fixedly disposed on the upper part of the snap-fit ​​plate.

[0030] As a further improvement of this utility model, the stop part includes a sleeve, a spring, a support rod and a threaded rotating head arranged along the height direction;

[0031] The upper end of the sleeve is fixedly installed below the plate-shaped structure, and the outer side of the sleeve is provided with threads;

[0032] The threaded rotating head and the sleeve are connected by a threaded drive.

[0033] The upper end of the support rod passes through the sleeve through the lower end opening;

[0034] One end of the spring abuts against the top of the sleeve, and the other end abuts against the upper end of the support rod;

[0035] A sliding rod is fixedly connected to the upper end of the support rod;

[0036] The sliding rod is arranged in a horizontal direction, and both ends of the sliding rod extend from the annular wall of the sleeve.

[0037] The annular wall of the sleeve is provided with a sliding groove along the height direction;

[0038] The sliding rod is slidably arranged within the sliding groove;

[0039] The threaded rotating head is supported below the sliding rod.

[0040] This utility model provides a station passenger flow guidance device, comprising: a moving and stopping unit, which is a plate-like structure arranged horizontally and located at the lower part of the guidance device, with a moving part and a stopping part arranged below the plate-like structure, the maximum height of the stopping part being greater than the height of the moving part and the minimum height being less than the height of the moving part; a support unit, which is a rod-like structure arranged vertically, with its lower end fixedly installed above the plate-like structure; and a guidance display unit, which is detachably installed at the upper end of the support unit. The device provided by this utility model displays directions to passengers through the guidance display unit, reducing the need for passengers to give directions; the detachable installation of the guidance display unit on the support unit allows staff to change the guidance display unit according to the specific station layout; and the moving and stopping parts allow the guidance device to adjust its position via the moving part and prevent it from moving arbitrarily during use by adjusting the height of the stopping part. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the overall structure of the station passenger flow guidance device of this utility model;

[0042] Figure 2 This is a cross-sectional view of the station passenger flow guidance device of this utility model along the height direction;

[0043] Figure 3 for Figure 2 Enlarged view of part A;

[0044] Figure 4for Figure 2 Enlarged view of part B;

[0045] Figure 5 This is a front view of the station passenger flow guidance device of this utility model;

[0046] Figure 6 for Figure 5 A cross-sectional view of the structure along CC;

[0047] Figure 7 This is a schematic diagram of the structure of the guidance display unit of the station passenger flow guidance device of this utility model;

[0048] Figure 8 This is a schematic diagram of the structure of the elastic plate, the release plate, the release block, and the rotating grip of the station passenger flow guidance device of this utility model;

[0049] Figure 9 This is a schematic diagram of the structure of the support unit, elastic end, fixed end and arc-shaped spring sheet of the station passenger flow guidance device of this utility model;

[0050] Figure 10 This is a schematic diagram of the stop part of the station passenger flow guidance device of this utility model;

[0051] Labeling Explanation: 1. Moving and stopping unit; 2. Support unit; 3. Guiding and display unit; 4. Guiding mounting base; 5. Guide sign; 6. Snap-fit ​​plate; 7. Elastic plate; 8. Unsnap plate; 9. Unsnap plate; 10. Unsnap block; 11. Rotating grip; 12. Elastic end; 13. Fixed end; 14. Arc-shaped spring; 15. Caster wheel; 16. Sleeve; 17. Spring; 18. Support rod; 19. Threaded rotating head; 20. Sliding rod. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0053] A station passenger flow guidance device, such as Figure 1 and Figure 2As shown, the device includes: a moving and stopping unit 1, which is a plate-like structure arranged horizontally and located below the guide device. A moving part and a stopping part are provided below the plate-like structure. The height of the stopping part is adjustable; specifically, the maximum height of the stopping part is greater than the height of the moving part, and the minimum height is less than the height of the moving part. A support unit 2, which is a rod-like structure arranged vertically, with its lower end fixedly installed above the plate-like structure. A guide display unit 3, which is detachably installed on the upper end of the support unit 2. The specific cross-sectional shape of the rod-like structure of the support unit 2 is not required; in this embodiment, a cylindrical rod is used, made of a rigid material. The specific material is not limited. In this embodiment, the lower end of the support unit 2 can be welded to the upper surface of the plate-like structure or fixedly installed on the upper surface of the plate-like structure using bolts. The specific connection method is not limited.

[0054] like Figure 7 As shown, the guide display unit 3 includes a guide mounting base 4, a guide sign 5, and an elastic snap-fit ​​part. The elastic snap-fit ​​part is fixedly disposed at the lower part of the guide mounting base 4 and snaps onto the top of the support unit 2. The lower part of the guide mounting base 4 abuts against the top of the support unit 2. The guide sign 5 is inserted vertically into the guide mounting base 4. At least one insertion slot is provided on the guide mounting base 4 in the vertical direction. The horizontal cross-section of the insertion slot is T-shaped or dovetail-shaped. The end of the guide sign 5 is adapted to the insertion slot. The number and angle of the insertion slots on the guide mounting base 4 are selected according to the actual situation. This embodiment does not impose specific limitations. Only four insertion slots are used as an example for explanation. These four insertion slots are evenly distributed at equal angles with the axis of the guide mounting base 4 as the center line, which can indicate four directions.

[0055] like Figure 6 and Figure 8 As shown, to facilitate the replacement of the guide mounting seat 4 at the upper end of the support unit 2, a regular polygonal snap-fit ​​plate 6 is provided at the top of the support unit 2; the elastic snap-fit ​​part includes multiple elastic plates 7 arranged in the vertical direction; the multiple elastic plates 7 are evenly distributed at equal angles to the axis of the snap-fit ​​plate 6; the number of elastic plates 7 is the same as the number of sides of the snap-fit ​​plate 6; the upper end of the elastic plate 7 is fixedly installed on the lower part of the guide mounting seat 4, and a right-angled triangular snap-fit ​​block is provided at the lower end; the snap-fit ​​plate 6 is snapped between the multiple elastic plates 7, and one right-angled side of the right-angled triangular block of the snap-fit ​​block abuts against the lower side of the snap-fit ​​plate 6; the lower part of the guide mounting seat 4 is pressed against the upper part of the snap-fit ​​plate 6.

[0056] In this embodiment, as Figure 3As shown, the snap-fit ​​plate 6 is a square plate, integrally set on the upper end of the support unit 2, and its side length is greater than the diameter of the support unit 2. The center of the snap-fit ​​plate 6 coincides with the axis of the support unit 2. The elastic plates 7 are set as four rectangular plates, evenly distributed at equal angles with the axis of the support unit 2 as the center line, and snap-fitted onto the four sides of the snap-fit ​​plate 6 respectively. The inner side surface of the four elastic plates 7 is in contact with the outer peripheral side surface of the snap-fit ​​plate 6. At the same time, the four snap-fit ​​blocks are all located on the side where the four elastic plates 7 face each other. The vertical projection of the lower end of the four snap-fit ​​blocks is outside the vertical projection of the snap-fit ​​plate 6. When the guide mounting base 4 needs to be installed on the upper end of the support unit 2, the inclined surfaces of the four snap-fit ​​blocks at the ends of the four elastic plates 7 at the lower part of the guide mounting base 4 are respectively placed on the four sides of the upper square surface of the snap-fit ​​plate 6. Then, by applying downward pressure to the top of the guide mounting base 4, the guide mounting base 4 moves downward. At this time, the inclined surfaces of the snap-fit ​​blocks and the edges of the snap-fit ​​plate 6 move relative to each other, thereby applying outward pressure to the elastic plates 7 through the snap-fit ​​blocks, which in turn causes the elastic plates 7 to deform outward. When the inclined surfaces of the snap-fit ​​blocks move to the moment they separate from the edges of the snap-fit ​​plate 6, the elastic plates 7 deform inward, causing the right-angled edge of the snap-fit ​​block at the top to snap into the lower part of the snap-fit ​​plate 6. At this time, the upper surface of the snap-fit ​​block is in contact with the lower surface of the snap-fit ​​plate 6, and the lower part of the guide mounting base 4 is pressed against the upper part of the snap-fit ​​plate 6.

[0057] To facilitate the release of the latching relationship between the latching plate 9, the latching block, and the elastic plate 7, a release plate 8 is provided in the middle of the lower surface of the guide mounting base 4. The release plate 8 has a receiving groove and multiple guide grooves communicating with the receiving groove. The multiple guide grooves are located on the periphery of the receiving groove and extend in a direction away from the receiving groove. The number of guide grooves is the same as the number of elastic plates 7, and they are evenly distributed at equal angles to the axis of the latching plate 6. The release plate 9 is slidably arranged in the guide groove. The end of the release plate 9 away from the receiving groove abuts against the elastic plate 7. The release block 10 is arranged in the receiving groove. The release block 10 has the same number of protrusions as the release plate 9. The rotation center of the release block 10 is connected to a rotating gripping part 11. The lower part of the release plate 8 abuts against the upper part of the latching plate 6. When the protrusions, the release plate 9, and the elastic plate 7 are in the same straight line, the latching block separates from the latching plate 6. The center of rotation of the release block 10 is provided with a rotating shaft; the upper end of the rotating shaft passes through the release plate 8 and the guide mounting seat 4 in sequence and is fixedly connected to the rotating grip part 11; the rotating grip part 11 is located on the upper part of the guide mounting seat 4.

[0058] In this embodiment, four release plates 9 are provided, each corresponding to one of the four elastic plates 7. They are evenly distributed at equal angles around the axis of the support unit 2. The inner end abuts against the release block 10, and the outer end abuts against the middle of the elastic plate 7. The release block 10 is integrally cast from two mutually perpendicular and equal-sized elliptical blocks, with the centers of the two elliptical blocks coinciding. The four protrusions are the two ends of the two elliptical blocks. A rotating shaft extends vertically upward from the center of the elliptical block. The rotating shaft is fixedly connected to the release block 10. The connection method is not required; a key connection can be used. The upper end of the rotating shaft passes sequentially through the release plate 8 and the guide mounting seat 4, and the upper end of the rotating shaft is located above the guide mounting seat 4. The rotating grip part 11 is... A rotating handle is coaxially fixed to the upper end of the rotating shaft. When it is necessary to release the locking relationship between the locking plate 9, the locking block, and the elastic plate 7, the rotating handle is rotated clockwise or counterclockwise. At this time, the four protrusions of the locking block 10 press the four locking plates 9 respectively, causing the four locking plates 9 to move outward, thereby pressing the elastic plate 7 to deform outward, thus separating the locking block from the locking plate 6, releasing the locking relationship, and realizing the separation of the guide mounting seat 4 from the locking plate 6. When the device is in normal use, the rotating handle is not rotated. The elastic force provided by the elastic plate 7 causes the locking block 10 to rotate through the locking plate 9, so that the locking block 10 does not press the locking plate 9.

[0059] like Figure 9 As shown, in order to prevent the locking plate 6 and the guide mounting seat 4 from re-engaging when the locking block separates from the locking plate 6 during the rotation of the handle, and to prevent the locking plate 6, the locking block and the elastic plate 7 from re-engaging, the upper part of the locking plate 6 is provided with an elastic telescopic part that extends and retracts in the vertical direction; the upper part of the elastic telescopic part abuts against the lower part of the guide mounting seat 4. The elastic telescopic part includes an elastic end 12 located at the upper part and a fixed end 13 located at the lower part; both the elastic end 12 and the fixed end 13 are rectangular cap-shaped structures, and their openings are opposite each other; an arc-shaped spring piece 14 is provided between the elastic end 12 and the fixed end 13; the elastic end 12 abuts against the lower part of the guide mounting seat 4; the fixed end 13 is fixedly disposed on the upper part of the locking plate 6.

[0060] Both the elastic end 12 and the fixed end 13 are square structures. The fixed end 13 is integrally formed with the snap-fit ​​plate 6. The opening of the elastic end 12 faces downward, and the opening of the fixed end 13 faces upward. The opening of the elastic end 12 is smaller than the opening of the fixed end 13 and can be accommodated within the opening of the fixed end 13. The arc-shaped spring piece 14 is located within the openings of the elastic end 12 and the fixed end 13, and is pressed between the elastic end 12 and the fixed end 13, generating a vertical elastic force. At the same time, the elastic end 12 and the fixed end 13 cannot be separated to prevent the arc-shaped spring piece 14 from being ejected. Specifically, an anti-detachment ring is provided on the outer side of the opening of the elastic end 12, and an anti-detachment ring is also provided on the inner side of the opening of the fixed end 13. The lower surface of the anti-detachment ring of the fixed end 13 abuts against the upper surface of the anti-detachment ring of the elastic end 12. When the snap-fit ​​block separates from the snap-fit ​​plate 6, the arc-shaped spring 14 releases its elastic force instantly, causing the snap-fit ​​plate 6 and the guide mounting seat 4 to have a vertical relative displacement, thereby realizing the separation of the snap-fit ​​plate 6 and the guide mounting seat 4.

[0061] The materials of each component in this embodiment are not specifically shown, as long as they can achieve the function of the device structure provided in this embodiment. In the specific use or production process, the operator or production personnel shall select the materials based on the actual situation.

[0062] In this embodiment, as Figure 4 and Figure 5 As shown, the movable part includes four casters 15, which are respectively arranged at the four corners of the lower surface of the plate-like structure. These casters allow the unit to turn freely as the worker applies force during movement, facilitating mobility. Figure 10 As shown, the stop part includes a sleeve 16, a spring 17, a support rod 18, and a threaded rotating head 19 arranged along the height direction; the upper end of the sleeve 16 is fixedly installed below the plate-like structure, and the outer side of the sleeve 16 is provided with threads; the threaded rotating head 19 is connected to the sleeve 16 by threaded transmission; the upper end of the support rod 18 passes through the lower end opening of the sleeve 16 and is inserted into the sleeve 16; one end of the spring 17 abuts against the top end of the sleeve 16, and the other end abuts against the upper end of the support rod 18; a sliding rod 20 is fixedly connected to the upper end of the support rod 18; the sliding rod 20 is arranged horizontally, and both ends of the sliding rod 20 extend from the annular wall of the sleeve 16 respectively; a sliding groove is opened in the annular wall of the sleeve 16 along the height direction; the sliding rod 20 is slidably arranged in the sliding groove; the threaded rotating head 19 is supported below the sliding rod 20. When the guide device needs to be moved, rotate the threaded rotating head 19 upward to push the sliding rod 20 upward, thereby driving the support rod 18 upward, so that the lower end of the support rod 18 is separated from the ground, making it easier for the guide device to move. When the guide device is moved to the predetermined position, rotate the threaded rotating head 19 downward until the upper side of the threaded rotating head 19 is completely separated from the lower side of the sliding rod 20. At this time, under the combined action of the elastic force provided by the spring 17 and the gravity of the support rod 18, the lower end of the support rod 18 is pressed against the ground, preventing the guide device from moving arbitrarily.

[0063] In this embodiment, four sets of stoppers are provided, each located at the center of one of the four sides of the lower surface of the plate-like structure. These four stoppers also serve a balancing function, preventing the guide device from tilting or tipping over due to uneven ground. A friction layer is provided at the lower end of the support rod 18, using rubber material to increase friction and further prevent the guide device from moving arbitrarily at the predetermined position.

[0064] The specific implementation method is as follows:

[0065] First, select appropriate guide mounting base 4 and guide sign 5 according to the intersection conditions of the station, and then assemble the entire guide device.

[0066] During assembly, the guide mounting base 4 is first installed on the top of the support unit 2. At this time, the snap-fit ​​block at the end of the elastic plate 7 is snapped into the bottom of the snap-fit ​​plate 6, and the arc-shaped spring piece 14 is in a compressed state.

[0067] Then move the guide device to the use position, and then rotate the threaded rotating head 19 so that the spring 17 applies elastic pressure to the support rod 18, and the lower part of the support rod 18 presses against the ground. At this time, the guide device no longer moves.

[0068] When the guide mounting seat 4 is damaged or needs to be replaced, rotate the gripping part 11 to release the locking block 10 and press the locking plate 9 to press the elastic plate 7, thereby separating the locking block at the end of the elastic plate 7 from the locking plate 6. At this time, the arc-shaped spring piece 14 releases its elastic force, separating the guide mounting seat 4 from the top of the support unit 2.

[0069] When it is necessary to move the guide device, rotate the threaded rotating head 19 so that the threaded rotating head 19 moves the support rod 18 upward through the sliding rod 20 until the lower end of the support rod 18 separates from the ground, and then move the guide device.

[0070] The specific embodiments of the utility model have been described in detail above, but they are only examples, and the utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the utility model are also within the scope of the utility model. Therefore, all equivalent transformations, modifications, and improvements made without departing from the spirit and principles of the utility model should be covered within the scope of the utility model.

Claims

1. A station passenger flow guidance device, characterized in that, The guiding device includes: The moving and stopping unit (1) is a plate-shaped structure arranged in the horizontal direction, located at the lower part of the guide device, and a moving part and a stopping part are provided below the plate-shaped structure. The maximum height of the stopping part is greater than the height of the moving part, and the minimum height is less than the height of the moving part. Support unit (2), the support unit (2) is a rod-shaped structure arranged in the vertical direction, and its lower end is fixedly installed above the plate-shaped structure; A guide display unit (3) is detachably installed on the upper end of the support unit (2); The guide display unit (3) includes a guide mounting base (4), a guide sign (5), and a flexible snap-fit ​​part; The elastic snap-fit ​​part is fixedly disposed at the lower part of the guide mounting base (4) and snap-fitted to the top of the support unit (2); The lower part of the guide mounting base (4) abuts against the top of the support unit (2); The guide sign (5) is inserted vertically into the guide mounting base (4).

2. The station passenger flow guidance device according to claim 1, characterized in that, The guide mounting base (4) has at least one insertion slot along the vertical direction; The horizontal cross-section of the insertion slot is T-shaped or dovetail-shaped; The end of the guide sign (5) is adapted to the insertion slot.

3. The station passenger flow guidance device according to claim 1, characterized in that, The top of the support unit (2) is provided with a regular polygonal snap-fit ​​plate (6); The elastic snap-fit ​​part includes a plurality of elastic plates (7) arranged in the vertical direction; The multiple elastic plates (7) are evenly distributed at the same angle to the axis of the snap-fit ​​plate (6); The number of elastic plates (7) is the same as the number of sides of the snap-fit ​​plate (6); The upper end of the elastic plate (7) is fixedly installed on the lower part of the guide mounting base (4), and a right-angled triangular snap-fit ​​block is provided at the lower end; The snap-fit ​​plate (6) is snapped between the plurality of elastic plates (7), and one right-angled side of the right-angled triangle block of the snap-fit ​​block abuts against the lower side of the snap-fit ​​plate (6); The lower part of the guide mounting base (4) abuts against the upper part of the snap-fit ​​plate (6).

4. The station passenger flow guidance device according to claim 3, characterized in that, The upper part of the snap-fit ​​plate (6) is provided with an elastic telescopic part that can extend and retract in the vertical direction; The upper part of the elastic telescopic part abuts against the lower part of the guide mounting seat (4).

5. The station passenger flow guidance device according to claim 4, characterized in that, The elastic telescopic part includes an elastic end (12) located at the upper part and a fixed end (13) located at the lower part; Both the elastic end (12) and the fixed end (13) are rectangular cap-shaped structures, and their openings are opposite to each other; An arc-shaped spring sheet (14) is pressed between the elastic end (12) and the fixed end (13); The elastic end (12) abuts against the lower part of the guide mounting seat (4); The fixed end (13) is fixedly disposed on the upper part of the snap-fit ​​plate (6).

6. The station passenger flow guidance device according to claim 1, characterized in that, The stop includes a sleeve (16), a spring (17), a support rod (18), and a threaded rotating head (19) arranged along the height direction; The upper end of the sleeve (16) is fixedly installed below the plate structure, and the outer side of the sleeve (16) is provided with threads; The threaded rotating head (19) and the sleeve (16) are connected by a threaded drive; The upper end of the support rod (18) passes through the sleeve (16) through the lower end opening; One end of the spring (17) abuts against the top of the sleeve (16), and the other end abuts against the upper end of the support rod (18); The upper end of the support rod (18) is fixedly connected to a sliding rod (20); The sliding rod (20) is arranged in a horizontal direction, and both ends of the sliding rod (20) extend from the annular wall of the sleeve (16); The annular wall of the sleeve (16) is provided with a sliding groove along the height direction; The sliding rod (20) is slidably arranged in the sliding groove; The threaded rotating head (19) is supported below the sliding rod (20).

Images