CN113663833A

CN113663833A - Rotatable deicing fluid spray head for bridge road

Info

Publication number: CN113663833A
Application number: CN202111050551.5A
Authority: CN
Inventors: 吴海丽
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2021-11-19

Abstract

The invention discloses a rotatable deicing liquid spray head for a bridge road, and belongs to the technical field of bridge road deicing. The utility model provides a bridge is rotatable formula deicing fluid shower nozzle for road, includes the box, symmetrical structure has set firmly two guide blocks A around the circle box outer wall is, two all be connected with guide block B between the tip of guide block A both sides, the ball groove has all been seted up to guide block A and guide block B top surface, and the ball groove middle part that is located the front side is equipped with the sliding ball, the coaxial connecting rod that has set firmly in sliding ball upper end, the connecting rod upper end has set firmly the base, base both sides upper end symmetry runs through and is equipped with spacing post, spacing post medial extremity has set firmly the slide-axle, the axle box has been seted up for the position of slide-axle to the sprinkler bead outer wall. The device not only can achieve the deicing fluid spraying effect of 360 degrees, so that the device is not limited by the spraying direction any more, but also can greatly reduce the electric power and the deicing fluid resources required to be consumed when the device is operated, and effectively save the cost consumed by deicing work.

Description

Rotatable deicing fluid spray head for bridge road

Technical Field

The invention relates to the technical field of bridge road deicing, in particular to a rotatable deicing fluid spray head for a bridge road.

Background

Road icing easily occurs within a period of time from 11 months to 4 months in the next year (namely winter and early spring), road icing phenomena often occur in northern areas of China, particularly northeast areas and northern areas of inner Mongolia, while snowfall in southern areas of China is generally 'wet snow', and the snow usually belongs to mixed water at 0-4 ℃, so that the ice slurry is formed after the snow falls on the ground, and the ice slurry can be solidified into large ice blocks when the temperature drops at night, and the road icing phenomena can occur as long as the minimum temperature in local winter is lower than 0 ℃, and the ice blocks can cause great traffic safety threats if the ice blocks are not processed in time.

Through retrieval, the patent with publication number CN111851389A discloses a rotatable deicing fluid nozzle for bridge roads, the device can realize the left and right swing of the nozzle, improve the deicing fluid injection area, because the nozzle is connected with a tee joint through a hose, the nozzle can freely move, the arrangement area of the nozzle is reduced, the pressure and the flowing speed of the deicing fluid are utilized to drive the nozzle to rotate, the operation is reliable, and the nozzle can be driven to act as long as the deicing fluid flows in a deicing fluid pipeline.

The existing device can only realize fan-shaped rotary spraying, the range is limited to one side of a road, so the device is not limited to the self spraying distance, and a plurality of pairs of devices are arranged according to the spraying distance in an equidistant mirror image manner to cover the deicing work of the same bridge pavement, thereby greatly improving the cost required by the deicing work, furthermore, the spraying height of the existing device is limited, the deicing fluid sprayed by the device can not be sprayed to the top surface of a guardrail at the bridge edge when the device is used on the bridge, so the frozen guardrail can not provide a supporting position for old people with inconvenient actions, even palm supported by the old people can slide to cause danger, in addition, the position of a spray head of the existing device can not avoid extending the edge to flow out part of the deicing fluid when the deicing fluid is sprayed, the deicing fluid can drip on the ground to generate an effect, but the dripping deicing fluid can accumulate a great amount in the long-time working process, resulting in considerable waste. CN211285469U also discloses a deicing device for road surface of roads and bridges, in which the spray head can only spray forward, and the height and direction of the spray head cannot be adjusted. In view of this, we propose a rotatable deicing fluid nozzle for bridge roads.

Disclosure of Invention

1. Technical problem to be solved

The invention aims to provide a rotatable deicing fluid spray head for a bridge road, which aims to solve the problems in the background technology.

2. Technical scheme

A rotatable deicing fluid nozzle for bridge roads comprises a box body, wherein a feeding pipe penetrates through the position, close to the right, on the rear side of the top surface of the box body, a guide plate is fixedly arranged at the edge of the top surface of the box body, a groove is formed in the position, opposite to the inner side of the guide plate, of the top surface of the box body, a plurality of leakage holes are formed in the bottom surface of the groove in an equidistant structure, a round box is fixedly arranged in the middle of the top surface of the box body, a bottom groove is formed in the lower side of the inner portion of the round box, a water pump is fixedly arranged at the rear end of the bottom surface of the bottom groove, a guide pipe is connected with the output end and the input end of the water pump, a water tank is arranged in the position, opposite to the upper portion of the bottom groove, a rotary table is arranged at the lower portion of the front wall of the water tank, a vertical groove is formed in the position, opposite to the rotary table, a plurality of rotary plates are fixedly arranged on the outer wall of the rotary table in an annular equidistant manner, a plurality of rotary table, the middle part of the top surface of the round box is provided with a rotating seat, the top surface of the round box is provided with a rotating groove relative to the rotating seat, a plurality of connecting plates are fixedly arranged between the bottom surface of the rotating seat and the top surface of the rotary table at equal intervals in an annular manner, the middle part of the rotating seat is provided with a water outlet, the upper end of the water outlet is connected with a metal hose, the front end of the top surface of the rotating seat is symmetrically provided with two side plates, a water spray head is hinged between the two side plates, the outer wall of the round box is provided with two guide blocks A in a front-back symmetrical structure, the end parts of the two sides of the two guide blocks A are both connected with a guide block B, the top surfaces of the guide blocks A and the guide block B are both provided with ball grooves, a sliding ball is arranged in the middle part of the ball groove on the front side, the upper end of the sliding ball is coaxially and fixedly provided with a connecting rod, the upper end of the connecting rod is fixedly provided with a base, the upper ends of the two sides of the base are symmetrically penetrated with limiting columns, and the inner side ends of the limiting columns are fixedly provided with sliding shafts, the position of the outer wall of the sprinkler head relative to the sliding shaft is provided with a shaft groove, and the ball groove can rotate 180 degrees around the axial direction of the box body.

Preferably, the bottom surface of the inner side of the box body is of an inverted step structure, the guide plate is of a step-shaped annular structure with a large upper part and a small lower part, the groove is of a square structure, and the inside of the groove is communicated with the inside of the box body through a plurality of leakage holes.

Preferably, be located the front side the pipe front end runs through kerve bottom surface middle part and box top surface in proper order and extends to the inside downside of box, is located the rear side the pipe rear end runs through kerve back wall middle part and is the arc structure and runs through circle box back wall right-hand member around the upside and extend to the inside right side of basin.

Preferably, the basin is fan-shaped structure, carousel and round box are in on the same axis, erect the groove and be greater than the cylinder structure of carousel diameter size for the diameter size, carousel bottom surface and perpendicular tank bottom surface normal running fit, the commentaries on classics board is L type structure, commentaries on classics board outside end is cambered surface structure, change board outer wall and board inslot wall sliding contact.

Preferably, the rotating seat and the rotating groove are both in a Chinese character 'zhong' structure, the rotating seat is in rotating fit with the rotating groove, the connecting plate is in an arc-shaped structure, the lower end of the metal hose is in a round platform structure with a small upper part and a large lower part, and the front end of the metal hose is connected with the rear end of the water spraying head.

Preferably, guide block A cross section and guide block B cross section all are two-thirds cylinder structure, two around guide block A is the high staggered arrangement structure setting in low back in the front, guide block B is S type structure, ball and ball groove sliding fit.

Preferably, the base is of a semicircular structure, the base and the sprinkler head are located on the same axis, the limiting column is of a T-shaped structure with a large outer part and a small inner part, the inner wall of the limiting column is of a cambered surface structure and is in sliding contact with the outer wall of the sprinkler head, and the sliding shaft is in sliding fit with the shaft groove.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

1. the invention is provided with the rotating seat, and the guide plate at the output end of the rear side of the water pump penetrates into the water tank and is positioned at the right side of the rear wall, so that the impact force of the deicing fluid can drive the rotating seat and the upper structure thereof to rotate through the rotating plate when the water pump fills the deicing fluid into the water tank, thus not only reaching the deicing fluid spraying effect of 360 degrees and avoiding the limitation of the spraying direction, but also greatly reducing the power resource required to be consumed when the device operates and further saving the cost consumed by deicing work.

2. The ice-removing device is provided with the guide block A, the guide block B and the sliding ball, one side of the ball groove at the high position is rotated to one side close to a guardrail, the spraying end of the water spraying head in the ice-removing device is upwards lifted when the ice-removing liquid is sprayed to the rear side through the sliding fit of the sliding ball, the guide block A and the ball groove on the guide block B, the ice blocks condensed on the guardrail and the handrail surface at the bridge edge or the roadside can be considered while the ice is removed from the bridge surface, the danger caused by the fact that old people with mobility disabilities are not helped when passing through the road section is prevented, the traveling safety of residents is guaranteed to the maximum extent, in addition, the water spraying head can better remove ice on the guardrail at the side of the high position, and the spraying angle of the water spraying head is more favorable for spraying the ice-removing liquid when the water is at the side of the low position.

3. The ice removing device is provided with the guide plate, and the ice removing liquid flowing along the lower edge of the water spray head can be received by the guide plate extending to the outer side of the box body and guided back to the box body when the water spray head sprays the ice removing liquid outwards, so that unnecessary consumption of the ice removing liquid can be greatly reduced, the utilization rate of the ice removing liquid is improved, and the ice removing device is high in practicability.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic sectional view of the case according to the present invention;

FIG. 3 is a schematic cross-sectional view of the round case of the present invention;

FIG. 4 is a schematic structural diagram of a guide block A, a guide block B and a base according to the present invention;

FIG. 5 is a schematic view of the exploded structure of the round box of the present invention;

fig. 6 is a schematic view of a rotating base structure according to the present invention.

The reference numbers in the figures illustrate: 1. a box body; 2. a feeding pipe; 3. a guide plate; 4. a groove; 5. a leak hole; 6. a round box; 7. a bottom groove; 8. a water pump; 9. a conduit; 10. a water tank; 11. a turntable; 12. a vertical slot; 13. rotating the plate; 14. a plate groove; 15. a rotating seat; 16. a rotating groove; 17. a connecting plate; 18. a water outlet; 19. a metal hose; 20. a side plate; 21. a sprinkler head; 22. a guide block A; 23. a guide block B; 24. a ball groove; 25. a sliding ball; 26. a connecting rod; 27. a base; 28. a limiting column; 29. a slide shaft; 30. and (4) a shaft groove.

Detailed Description

Referring to fig. 1-6, the present invention provides a technical solution:

a rotatable deicing fluid nozzle for bridge roads comprises a box body 1, a feeding pipe 2 penetrates through the position, close to the right, of the rear side of the top surface of the box body 1, a guide plate 3 is fixedly arranged at the edge of the top surface of the box body 1, a groove 4 is formed in the position, opposite to the inner side of the guide plate 3, of the top surface of the box body 1, a plurality of leak holes 5 are formed in the bottom surface of the groove 4 in an equidistant structure, a round box 6 is fixedly arranged in the middle of the top surface of the box body 1, a bottom groove 7 is formed in the lower side of the inside of the round box 6, a water pump 8 is fixedly arranged at the rear end of the bottom surface of the bottom groove 7, a guide pipe 9 is connected with the output end and the input end of the water pump 8, a water tank 10 is arranged in the position, opposite to the upper side of the bottom groove 7, a rotary table 11 is arranged at the lower part of the water tank 10, a vertical groove 12 is formed in the middle of the front wall of the water tank 10, opposite to the rotary table 11, a plurality of rotary plates 13 are annularly and equidistantly arranged, a plate groove 14 is formed at the lower end of the rotary plate groove 10, a rotating seat 15 is arranged in the middle of the top surface of the round box 6, a rotating groove 16 is arranged on the top surface of the round box 6 corresponding to the rotating seat 15, a plurality of connecting plates 17 are fixedly arranged between the bottom surface of the rotating seat 15 and the top surface of the rotating disc 11 at equal intervals in an annular shape, a water outlet 18 is arranged in the middle of the rotating seat 15, a metal hose 19 is connected with the upper end of the water outlet 18, two side plates 20 are symmetrically and fixedly arranged at the front end of the top surface of the rotating seat 15, water spray heads 21 are hinged between the two side plates 20, two guide blocks A22 are fixedly arranged on the outer wall of the round box 6 in a front-back symmetrical structure, guide blocks B23 are connected between the end parts of both sides of the two guide blocks A22, ball grooves 24 are respectively arranged on the top surfaces of the guide blocks A22 and the guide blocks B23, a sliding ball 25 is arranged in the middle of the ball groove 24 on the front side, a connecting rod 26 is coaxially arranged at the upper end of the sliding ball 25, a base 27 is fixedly arranged at the upper end of the connecting rod 26, limit columns 28 are symmetrically and penetratingly arranged on the upper ends of both sides of the base 27, and are provided with limit columns 28, a sliding shaft 29, the outer wall of the sprinkler head 21 is provided with a shaft groove 30 corresponding to the position of the sliding shaft 29, and the ball groove 24 can rotate 180 degrees around the axial direction of the box body.

Specifically, the inboard bottom surface of box 1 is the halfpace structure of invering, baffle 3 is big-end-up's halfpace type annular structure, recess 4 is a square structure, recess 4 is inside to be linked together through a plurality of small openings 5 and box 1, sprinkler bead 21 can be caught by the baffle 3 that extends to 1 outside of box along its lower limb trickling deicing fluid when outwards spraying deicing fluid, even if can flow and then concentrate on in recess 4 to 1 top surface of box along the inclined plane, just later can collect inside box 1 again through small opening 5.

Further, the pipe 9 front end that is located the front side runs through bottom slot 7 bottom surface middle part and 1 top surface of box in proper order and extends to the inside downside of box 1, and the pipe 9 rear end that is located the rear side runs through bottom slot 7 back wall middle part and is the arc structure and runs through the back wall right-hand member around the upper side and extend to the inside right side of basin 10 around 6 back wall.

Furthermore, the water tank 10 is of a fan-shaped structure, the rotary table 11 and the round box 6 are on the same axis, the vertical groove 12 is of a cylindrical structure with the diameter larger than that of the rotary table 11, the bottom surface of the rotary table 11 is in running fit with the bottom surface of the vertical groove 12, the rotating plate 13 is of an L-shaped structure, the outer side end of the rotating plate 13 is of a cambered surface structure, and the outer wall of the rotating plate 13 is in sliding contact with the inner wall of the plate groove 14.

Furthermore, the rotating seat 15 and the rotating groove 16 are both in a Chinese character 'zhong' structure, the rotating seat 15 and the rotating groove 16 are in rotating fit, the connecting plate 17 is in an arc structure, the lower end of the metal hose 19 is in a circular truncated cone structure with a small upper part and a large lower part, the front end of the metal hose 19 is connected with the rear end of the water spray head 21, a worker can place the device on one side of a bridge, immediately start the water pump 8 to enable the water pump 8 to suck deicing liquid in the box body 1 through the front side conduit 9 and fill the deicing liquid into the water groove 10 through the rear side conduit 9, as the upper end part of the rear side conduit 9 penetrates into the right end of the rear wall of the water groove 10, the deicing liquid sprayed from the water pump can impact the rotating plate 13 on the right side, the rotating plate 13 is in an L-shaped structure, so that the deicing liquid can be converted into thrust to drive the rotating disc 11 to rotate, and the connecting plate 17 on the rotating seat 15 and the upper structure can simultaneously drive the rotating seat 15 to rotate along the rotating groove 16 when the rotating disc 11 rotates, at the same time, the deicing fluid in the water tank 10 is also poured into the metal hose 19 along the water outlet 18 and finally sprayed out from the water spray head 21, so that the deicing effect on the bridge deck can be achieved.

It is worth introducing that the cross section of the guide block A22 and the cross section of the guide block B23 are both in a two-thirds cylindrical structure, the front guide block A22 and the rear guide block B3526 are arranged in a staggered arrangement structure with a low front part and a high rear part, the guide block B23 is in an S-shaped structure, and the sliding ball 25 is in sliding fit with the ball groove 24.

It should be noted that the base 27 is a semicircular structure, the base 27 and the sprinkler head 21 are located on the same axis, the limiting column 28 is a T-shaped structure with a large outside and a small inside, the inner wall of the limiting column 28 is a cambered structure and is in sliding contact with the outer wall of the sprinkler head 21, the sliding shaft 29 is in sliding fit with the shaft groove 30, when the rotating base 15 drives the sprinkler head 21 to rotate, the lower part of the sprinkler head 21 is also in circular motion through the connecting rod 26 and the sliding ball 25 fixed on the base 27 in sliding connection therewith, and due to the sliding fit of the sliding ball 25 and the ball groove 24, the sliding ball 25 drives the connecting rod 26 and the sprinkler head 21 to swing up and down under the guiding of the guiding block a22 and the guiding block B23, when the sprinkler head 21 rotates to the rear side, the connecting rod 26 will push up the base 27 and the sprinkler head 21, the sliding shaft 29 fixed on the base 27 of the sprinkler head 21 through the limiting column 28 will slide to the shaft groove 30 to the other end to adapt to the angle change of the sprinkler head 21, at this moment, the spraying angle of the water spraying head 21 can be greatly increased, so that the deicing liquid can be sprayed on the guardrail at the edge of the bridge, and the deicing device can also take account of the deicing of the guardrail handrail while deicing is carried out on the bridge road surface.

The working principle is as follows: the working personnel can place the device at one side of a bridge, then rotate the high side of the ball groove to one side close to a guardrail, immediately start the water pump 8 to enable the water pump 8 to suck the deicing fluid in the box body 1 through the front guide pipe 9 and then pour the deicing fluid into the water groove 10 through the rear guide pipe 9, because the upper end part of the rear guide pipe 9 penetrates into the right end of the rear wall of the water groove 10, the deicing fluid sprayed out of the water pump can impact on the rotating plate 13 at the right side, and the rotating plate 13 is of an L-shaped structure, so that the impact force of the deicing fluid can be converted into thrust to drive the rotating disc 11 to rotate, the connecting plate 17 on the rotating disc 11 can drive the rotating seat 15 and the upper structure to rotate along the rotating groove 16 simultaneously when the rotating disc 11 rotates, meanwhile, the deicing fluid in the water groove 10 can also pour into the metal hose 19 along the water outlet 18 and finally spray out from the water spray head 21, thus the deicing effect can be achieved, furthermore, when the rotating seat 15 drives the sprinkler head 21 to rotate, the connecting rod 26 and the sliding ball 25 fixed on the lower portion of the sprinkler head 21 through the base 27 connected with the sprinkler head 21 in a sliding manner also move circularly, and because the sliding ball 25 is in sliding fit with the ball groove 24, the sliding ball 25 drives the connecting rod 26 and the sprinkler head 21 to swing up and down under the guiding of the guide block a22 and the guide block B23, when the sprinkler head 21 rotates to the rear side, the connecting rod 26 can jack up the base 27 and the sprinkler head 21, the sliding shaft 29 fixed on the base 27 of the sprinkler head 21 through the limiting column 28 can slide to the other end along the shaft groove 30 to adapt to the change of the angle of the sprinkler head 21, the spraying angle of the sprinkler head 21 is greatly increased, so that the deicing fluid can be sprayed on the guardrail at the edge of the bridge, the device can deice the bridge at the same time of deicing the guardrail at the same time of deicing the face, on the other hand, the water spray head 21 sprays the deicing fluid to the outside, and the deicing fluid flowing along the lower edge of the water spray head is caught by the guide plate 3 extending to the outside of the tank 1 and then collected in the groove 4 through the leak hole 5 even if flowing along the inclined surface toward the top surface of the tank 1.

Claims

1. The utility model provides a bridge is rotatable formula deicing fluid shower nozzle for road, includes box (1), its characterized in that: the device is characterized in that a feeding pipe (2) penetrates through the position, close to the right part, of the rear side of the top surface of the box body (1), a guide plate (3) is fixedly arranged at the edge of the top surface of the box body (1), a groove (4) is formed in the position, opposite to the inner side of the guide plate (3), of the top surface of the box body (1), a plurality of leakage holes (5) are formed in the bottom surface of the groove (4) in an equidistant structure, a round box (6) is fixedly arranged in the middle of the top surface of the box body (1), a bottom groove (7) is formed in the lower side of the inside of the round box (6), a water pump (8) is fixedly arranged at the rear end of the bottom surface of the bottom groove (7), the output end and the input end of the water pump (8) are both connected with a guide pipe (9), a water tank (10) is formed in the position, opposite to the upper part of the bottom groove (7), a rotary table (11) is arranged at the lower part of the front wall of the water tank (10), a vertical groove (12) is formed in the middle of the front wall of the water tank (10), the outer wall of the rotary table (11) is provided with a plurality of rotary plates (13) at equal intervals in an annular shape, the lower end of the front wall of the water tank (10) is provided with plate grooves (14) at positions corresponding to the rotary plates (13), the middle part of the top surface of the round box (6) is provided with a rotary seat (15), the top surface of the round box (6) is provided with a rotary groove (16) at positions corresponding to the rotary seat (15), a plurality of connecting plates (17) are fixedly arranged between the bottom surface of the rotary seat (15) and the top surface of the rotary table (11) at equal intervals in an annular shape, the middle part of the rotary seat (15) is provided with a water outlet (18), the upper end of the water outlet (18) is connected with a metal hose (19), the front end of the top surface of the rotary seat (15) is symmetrically provided with two side plates (20), a water spray head (21) is hinged between the two side plates (20), the outer wall of the round box (6) is provided with two guide blocks A (22) at the front and back symmetrical structure, two all be connected with guide block B (23) between guide block A (22) both sides tip, ball groove (24) have all been seted up to guide block A (22) and guide block B (23) top surface, and ball groove (24) middle part that is located the front side is equipped with slide ball (25), the coaxial connecting rod (26) that has set firmly in slide ball (25) upper end, connecting rod (26) upper end has set firmly base (27), base (27) both sides upper end symmetry is run through and is equipped with spacing post (28), spacing post (28) medial extremity has set firmly slide-axle (29), axle groove (30) have been seted up for the position of slide-axle (29) to sprinkler bead (21) outer wall, ball groove (24) can be around box axial 180 degrees rotations.

2. The rotatable deicing fluid nozzle for bridge roads of claim 1, wherein: the box (1) inboard bottom surface is the halfpace structure of invering, baffle (3) are halfpace type annular structure big-end-up, recess (4) are square structure, recess (4) are inside through a plurality of small opening (5) are linked together with box (1) is inside.

3. The rotatable deicing fluid nozzle for bridge roads of claim 1, wherein: be located the front side pipe (9) front end runs through kerve (7) bottom surface middle part and box (1) top surface in proper order and extends to the inside downside of box (1), is located the rear side pipe (9) rear end runs through kerve (7) back wall middle part and is the arc structure and runs through wall right-hand member and extend to the inside right side of basin (10) around supreme side behind circle box (6).

4. The rotatable deicing fluid nozzle for bridge roads of claim 1, wherein: basin (10) are fan-shaped structure, carousel (11) and circle box (6) are in on the same axis, erect groove (12) and be greater than carousel (11) diameter size's cylinder structure for diameter size, carousel (11) bottom surface and perpendicular groove (12) bottom surface normal running fit, commentaries on classics board (13) are L type structure, commentaries on classics board (13) outside end is ARC structure, commentaries on classics board (13) outer wall and board groove (14) inner wall sliding contact.

5. The rotatable deicing fluid nozzle for bridge roads of claim 1, wherein: the rotary seat (15) and the rotary groove (16) are both in a Chinese character 'zhong' structure, the rotary seat (15) is in running fit with the rotary groove (16), the connecting plate (17) is of an arc-shaped structure, the lower end of the metal hose (19) is of a round table structure with a small upper part and a large lower part, and the front end of the metal hose (19) is connected with the rear end of the water spray head (21).

6. The rotatable deicing fluid nozzle for bridge roads of claim 1, wherein: the cross section of the guide block A (22) and the cross section of the guide block B (23) are both of a two-thirds cylindrical structure, the front guide block A (22) and the rear guide block B (23) are arranged in a staggered structure with a low front part and a high rear part, the guide block B (23) is of an S-shaped structure, and a sliding ball (25) is in sliding fit with a ball groove (24).

7. The rotatable deicing fluid nozzle for bridge roads of claim 1, wherein: the base (27) is of a semicircular structure, the base (27) and the sprinkler bead (21) are located on the same axis, the limiting column (28) is of a T-shaped structure with a large outer side and a small inner side, the inner wall of the limiting column (28) is of an arc surface structure and is in sliding contact with the outer wall of the sprinkler bead (21), and the sliding shaft (29) is in sliding fit with the shaft groove (30).