CN109083053B

CN109083053B - A mobilizable interim guardrail for municipal works

Info

Publication number: CN109083053B
Application number: CN201811196235.7A
Authority: CN
Inventors: 林晓燕; 庞丽娟; 林高健
Original assignee: Hangzhou Fuyang Feishang Decoration Engineering Co ltd
Current assignee: Pingyi Jingfa Industry Development Co.,Ltd.
Priority date: 2018-10-15
Filing date: 2018-10-15
Publication date: 2020-10-09
Anticipated expiration: 2038-10-15
Also published as: CN111996960A; CN111996961A; CN109083053A

Abstract

The invention belongs to the technical field of guardrails, and particularly relates to a movable temporary guardrail for municipal engineering, which comprises a guardrail, a vehicle mechanism, an adjusting mechanism and a steering mechanism, wherein after a brake plate is in compression joint with the ground, a larger static friction force exists between the brake plate and the ground, so that the temporary guardrail can not be easily pushed; the temporary guardrail of the invention has the braking effect of the traditional temporary guardrail. In addition, when the temporary guardrail is still pushed by external force after braking, the front wheels and the rear wheels can still roll, and only the braking plate is abraded, so that the abrasion condition caused by the fact that the wheels slide on the ground in a non-rotating mode in the traditional temporary guardrail is avoided, the condition that the wheels are abraded into a non-circular shape is avoided, and the wheels can ensure that the temporary guardrail can walk stably. The invention has simple structure and better use effect.

Description

A mobilizable interim guardrail for municipal works

Technical Field

The invention belongs to the technical field of guardrails, and particularly relates to a movable temporary guardrail for municipal engineering.

Background

At present municipal administration is repaiied the way or is repaiied the pipeline, often need keep apart certain region, and mobilizable interim guardrail just can be very conveniently kept apart this region this moment, prevents that non-staff from getting into. However, in some special cases, the non-working person may push the temporary guard rail, and in order to prevent the non-working person from pushing the temporary guard rail, the conventional movable temporary guard rail has a brake mechanism on the wheels. However, after the wheels of the movable temporary guardrail are braked and the temporary guardrail is pushed by a large external force, the wheels on the temporary guardrail slide on the ground in a non-rotating manner, so that the wheels are easily worn for a long time, the wheels are further worn to be in a non-circular shape, and the wheels in the non-circular state are easily bumpy in the rolling process. In order to prevent the wheels on the temporary guard rail from being worn out in a non-circular shape, it is necessary to design a movable temporary guard rail that does not brake the wheels on the temporary guard rail.

The present invention is directed to a removable temporary barrier for municipal works to solve the above problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a movable temporary guardrail for municipal engineering, which is realized by adopting the following technical scheme.

In the description of the present invention, it should be noted that the terms "inside", "below", "upper" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention usually place when using, and are only used for convenience of description and simplification of description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation or be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

A mobilizable interim guardrail for municipal works which characterized in that: the device comprises a protective guard, a base, rear wheels, a braking mechanism, an adjusting mechanism, a steering mechanism, front wheels, a first supporting plate, a rear shaft, a first belt pulley and a belt, wherein the protective guard is arranged on the upper surface of the base; the lower surface of the base is provided with a braking mechanism; the lower surface of one end of the base is symmetrically provided with two first supporting plates, and the other end of the base is provided with a steering mechanism; two front wheels are arranged on the steering mechanism; an adjusting mechanism is arranged on the side surface of the base; the rear shaft is arranged in the circular holes of the two first supporting plates through bearings, and two ends of the rear shaft penetrate through the two first supporting plates; two rear wheels are symmetrically arranged at two ends of the rear shaft; the first belt pulley is arranged on the rear shaft and is positioned between the two first supporting plates; one end of the belt is mounted on the first belt pulley, and the other end is mounted on the brake mechanism.

The brake mechanism comprises a rectangular support ring, a second fixed plate, a first fixed plate, a rectangular guide cylinder, a third support plate, a second support plate, a one-way clutch, a fixed hole, a first rotating shaft, a second belt pulley, a first pinion, a first telescopic shaft, a first bull gear, a plate spring, a first gear, a connecting plate, a second gear, a second telescopic shaft, a second pinion, a reversing gear, a second bull gear, a third gear, a second rotating shaft, an adjusting block, a brake plate, a third rack, a first guide block, a first sliding plate, a first spring, a first sliding chute, a first guide groove, a second sliding plate, a second guide block, a second spring, a first rack, a second rack and an inclined plane, the first fixing plate, the second supporting plate, the third supporting plate, the rectangular guide cylinder and the second fixing plate are all arranged in the middle of the lower surface of the base; the rectangular guide cylinder is positioned between the first fixing plate and the third supporting plate; the second supporting plate is close to the first supporting plate and is positioned between the third supporting plate and the first supporting plate; the second fixing plate is close to the side surface of the base; the second supporting plate is provided with a through fixing hole; the first telescopic shaft consists of a first rotating sleeve and a first telescopic inner shaft, and the first telescopic inner shaft drives the first rotating sleeve to rotate; a one-way clutch is arranged on the outer circular surface of the first rotating shaft; the outer circular surface of the one-way clutch is fixedly arranged in the fixing hole of the second supporting plate; a first gear is arranged on the first telescopic inner shaft; the first gearwheel is arranged on the first rotating sleeve and is positioned between the one-way clutch and the first gear; the first rotating shaft is arranged in a circular hole of the second supporting plate through a bearing and is positioned on the lower side of the first telescopic shaft; the second belt pulley and the first pinion are both arranged on the first rotating shaft, and the second belt pulley is positioned between the second support plate and the first pinion; the first small gear is meshed with the first large gear; the second telescopic shaft consists of a second rotating sleeve and a second telescopic inner shaft, and the second telescopic inner shaft drives the second rotating sleeve to rotate; the second rotating sleeve is arranged in a round hole of the third supporting plate through a bearing; the second pinion and the second gear are both arranged on the second telescopic inner shaft, and the second pinion is positioned between the second gear and the second rotating sleeve; the change gear is arranged on the third supporting plate through a shaft; the second rotating shaft is arranged in a circular hole of the third supporting plate through a bearing; the third gear and the second gearwheel are both arranged on the second rotating shaft, and the third gear is positioned between the second gearwheel and the third supporting plate; the change gear is positioned between the second gearwheel and the second telescopic inner shaft; the change gear is meshed with the second gearwheel; the change gear is matched with the second pinion; one end of the connecting plate is arranged at one end of the first telescopic inner shaft far away from the first rotating sleeve, and the other end of the connecting plate is arranged at one end of the second telescopic inner shaft far away from the second rotating sleeve; one end of the second fixing plate, which is far away from the base, is provided with a rectangular support ring; the adjusting block is arranged in the rectangular support ring in a sliding fit mode, and two ends of the adjusting block penetrate out of the rectangular support ring; one end of the adjusting block is fixedly arranged on the plate surface of the connecting plate far away from the first telescopic inner shaft, and the other end of the adjusting block is provided with an inclined surface; one end of each plate spring is arranged on two side surfaces of the rectangular support ring, and the other end of each plate spring is arranged on the connecting plate; the two plate springs are distributed on two sides of the adjusting block; the rectangular guide cylinder is provided with a first sliding groove; two first guide grooves are symmetrically formed in two sides of the first sliding groove; two first guide blocks are symmetrically arranged on two sides of one end of the first sliding plate, and a brake plate is arranged at the other end of the first sliding plate; a third rack is arranged on the side surface of the first sliding plate; the first sliding plate is arranged in the first sliding groove of the rectangular guide cylinder in a sliding fit mode; one end of the first spring is arranged on the first sliding plate, the other end of the first spring is arranged on the bottom surface of the first sliding chute, and the first spring is positioned in the first sliding chute of the rectangular guide cylinder; the two first guide blocks are respectively arranged in the two first guide grooves in a sliding fit manner; the third rack slides in the rectangular guide cylinder; the third gear is meshed with the third rack; a through second sliding chute is formed in the surface, away from the base, of the first fixing plate; two second guide grooves are symmetrically formed in two sides of the second sliding groove; two second guide blocks are symmetrically arranged on two sides of the second sliding plate; the second sliding plate is arranged in the second sliding groove of the first fixed plate in a sliding fit manner; the two second guide blocks are respectively arranged in the two second guide grooves in a sliding fit manner; one ends of the two second springs are respectively arranged on the two second guide blocks, and the other ends of the two second springs are respectively arranged on the groove surfaces of the two second guide grooves; the two second springs are respectively positioned in the two second guide grooves; a first rack and a second rack are arranged on the lower surface of the second sliding plate; the first rack and the second rack are distributed along the length direction of the second sliding plate, and a space is reserved between the first rack and the second rack; the first gear is matched with the first rack; the second gear is matched with the second rack.

One end of the belt is arranged on the first belt pulley, and the other end of the belt is arranged on the second belt pulley.

The steering mechanism has the function of adjusting the steering of the front wheels; the adjusting mechanism enables the adjusting block to slide in the rectangular supporting ring, and the purpose that the adjusting block generates displacement is achieved.

The steering mechanism also has the function of controlling the action of the adjusting mechanism, so that the adjusting block is subjected to displacement adjustment after the adjusting mechanism acts.

As a further improvement of the present technology, the adjusting mechanism includes a trigger plate, a sliding bar, a third fixing plate, a third guide block, a third spring, a third guide groove, a third sliding groove, and an inclined surface, wherein the third fixing plate is installed on a side surface of the base; a third through chute is arranged in the third fixing plate; two third guide grooves are symmetrically formed in two sides of the third sliding groove; two third guide blocks are symmetrically arranged on two sides of the sliding strip; the sliding strip is arranged in a third sliding groove of the third fixing plate in a sliding fit manner; the two third guide blocks are respectively arranged in the two third guide grooves in a sliding fit manner; one end of each of the two third springs is respectively arranged on the two third guide blocks, and the other end of each of the two third springs is respectively arranged on the groove surfaces of the two third guide grooves; the two third springs are respectively positioned in the two third guide grooves; one end of the sliding strip is provided with an inclined plane, and the other end of the sliding strip is provided with a trigger plate; the trigger plate is matched with the inclined plane of the adjusting block; the inclined plane of the sliding strip is matched with the steering mechanism.

As a further improvement of the technology, the steering mechanism comprises a movable plate, a pressing bar, a handle, an adjusting rod, a fourth fixed plate, a fifth fixed plate, a second telescopic rod, a fixed block, a sixth fixed plate, a first telescopic rod, a rotating block, a front shaft, a ring disc, a seventh fixed plate, a limiting plate and a C-shaped elastic sheet, wherein the fourth fixed plate is mounted on the upper surface of one end of the base, which is far away from the rear wheels; the sixth fixing plate is arranged on the lower surface of one end of the base far away from the rear wheel through a fixing block; the two seventh fixing plates are symmetrically arranged on the fourth fixing plate and are positioned at one end of the fourth fixing plate far away from the base; the fifth fixing plate is arranged at the middle position of the fourth fixing plate; the mounting surface of the fifth fixing plate and the mounting surface of the seventh fixing plate are the same; one end of each of the two second telescopic rods is arranged on the lower surface of the fifth fixing plate, and the other end of each of the two second telescopic rods is provided with the moving plate; the two second telescopic rods are symmetrically distributed on the moving plate; a through round hole is formed in the middle of the moving plate and is positioned between the two second telescopic rods; one end of the pressing bar is arranged on the side surface of the movable plate; the first telescopic rod consists of a telescopic outer sleeve and a telescopic inner rod, and the telescopic inner rod drives the telescopic outer sleeve to rotate; the telescopic outer sleeve is arranged in a round hole of the sixth fixing plate through a bearing, and two ends of the telescopic outer sleeve penetrate through the sixth fixing plate; the telescopic inner rod is arranged in a circular hole of the moving plate through a bearing and penetrates through the moving plate; a rotating block is fixedly arranged at one end of the telescopic outer sleeve far away from the telescopic inner rod; two front shafts are symmetrically arranged on two sides of the rotating block; one end of the adjusting rod is provided with a handle, and the other end of the adjusting rod penetrates through the fifth fixing plate and is fixedly connected with one end of the telescopic inner rod; the ring disc is fixedly arranged on the adjusting rod and is positioned between the handle and the fifth fixing plate; the two C-shaped elastic pieces are respectively arranged on the two seventh fixing plates in a symmetrical mode; the two limiting plates are respectively arranged on the two seventh fixing plates in a symmetrical mode; the two C-shaped elastic sheets are positioned between the two seventh fixing plates; the two limiting plates are positioned between the two seventh fixing plates; the limiting plate is positioned at the lower side of the C-shaped elastic sheet; the ring disc is matched with the two C-shaped elastic sheets; the ring disc is matched with the two limiting plates.

As a further improvement of the present technology, two of the front wheels are mounted on the two front axles, respectively; the pressing strip is matched with the inclined plane on the sliding strip.

As a further improvement of the present technology, the teeth on the first rack, the second rack, the first gear, the second pinion, and the direction change gear are all the same, and for the teeth of the first gear: the teeth of the first gear have the shape of the conventional teeth, and the teeth of the first gear have sharp corners at both ends. The design of the tooth shape is as follows: when the first gear moves along the axial direction to be meshed with the first rack again, the sharp corners on the teeth can enable the teeth on the first gear to be inserted into the gaps between two adjacent teeth on the first rack smoothly, so that the first gear is meshed with the first gear smoothly, the situation that the teeth on the first gear cannot be inserted into the gaps between two adjacent teeth on the first rack is avoided, and the situation that the first gear cannot be meshed with the first rack during the axial movement is further avoided. The design of the teeth also enables the second gear to be smoothly meshed with the second rack when the second gear moves axially. And the design of the teeth also enables the second pinion to be smoothly meshed with the change gear when the second pinion moves axially.

As a further improvement of the present technology, the diameter of the first pinion gear is smaller than the diameter of the first bull gear. The design is that: when the first pinion drives the first telescopic shaft to rotate through the first gearwheel, and the first telescopic shaft drives the first gear to rotate, the torque transmitted to the first gear by the first pinion is increased, and the rotating speed of the first gear is lower than that of the first pinion, so that the first gear achieves the effects of reducing speed and increasing torque.

As a further improvement of the present technology, the diameter of the change gear is smaller than the diameter of the second gearwheel; the diameter of the second pinion gear is smaller than that of the second gearwheel. The design is that: when the second pinion drives the second gearwheel to rotate through the change gear and the second gearwheel drives the third gear to rotate through the second rotating shaft, the torque transmitted to the third gear by the second pinion is increased, and the rotating speed of the third gear is lower than that of the second pinion, so that the third gear achieves the effects of reducing speed and increasing torque.

As a further improvement of the technology, the rubber handle sleeve is arranged on the handle, and the rubber handle sleeve is provided with an anti-skidding structure.

As a further improvement of the present technology, the C-shaped elastic piece is made of a metal material.

As a further improvement of the present technology, the first spring is an extension spring; the second spring is an extension spring; the third spring is a compression spring.

The design of the rear wheel, rear axle, first pulley, belt and second pulley lies in: when the rear wheel moves forwards, the rear wheel rotates anticlockwise; the rear wheel drives the first belt pulley to rotate through the rear shaft, and the first belt pulley drives the second belt pulley to rotate anticlockwise through the belt.

For the braking mechanism: the second belt pulley drives the first pinion to rotate through the first rotating shaft, the first pinion drives the first telescopic shaft to rotate through the first large gear, and the first telescopic shaft drives the first gear to rotate. The design of the one-way clutch is that when the first pinion rotates anticlockwise, the first gearwheel drives the first telescopic shaft to rotate clockwise, and under the one-way action of the one-way clutch, the one-way clutch allows the first telescopic shaft to rotate clockwise, and the one-way clutch limits the first telescopic shaft to rotate anticlockwise. Because one-way clutch restricts first telescopic shaft anticlockwise rotation, so first pinion, first pivot and second belt pulley all can't clockwise rotation, and then make first belt pulley, rear axle and the unable clockwise rotation of rear wheel, also the rear wheel can't retreat the walking promptly. When the change gear drives the third gear to rotate through the second large gear and the second rotating shaft, the third gear drives the third rack to move, and the third rack drives the first sliding plate to slide in the rectangular guide cylinder. For the design of the first guide block, the first guide block slides along with the first sliding plate, the first guide block can ensure that the first sliding plate slides stably in the rectangular guide cylinder, and the first guide block can also prevent the first sliding plate from being separated from the rectangular guide cylinder. For the design of the second guide block, the second guide block slides along with the second sliding plate, the second guide block can ensure that the second sliding plate stably slides in the second sliding groove, and the second guide block can also prevent the second sliding plate from falling off from the first fixing plate. The design with the space between the first rack and the second rack is as follows: the first gear can only drive the first rack to move but not drive the second rack to move, the first rack cannot drive the second gear to rotate, and the second rack can drive the second gear to rotate. The rectangular support ring can ensure that the adjusting block can stably slide in the rectangular support ring after being extruded.

Diversion gear cooperatees with the second pinion, and first gear cooperatees with first rack, and second gear and second rack matched with effect lie in: firstly, when the adjusting block is not extruded, the first gear and the first rack are in a meshed state, the second gear and the second pinion are positioned on two sides of the second rack, and the second gear and the second pinion are not meshed with the second rack. Secondly, after the regulating block is extruded, the regulating block drives the connecting plate to move towards the direction of the first telescopic shaft, the first telescopic inner shaft and the second telescopic inner shaft are compressed, the plate spring is compressed, a first gear on the first telescopic inner shaft is separated from being meshed with the first rack, in the process that the first gear is separated from being meshed with the first rack, a second gear on the second telescopic inner shaft is meshed with the second rack, and a second pinion on the second telescopic inner shaft is meshed with the change gear. Thirdly, when the first gear is completely disengaged from the first rack, the second gear is completely engaged with the second rack, and the second pinion is completely engaged with the change gear. Fourthly, after the adjusting block is not extruded any more, under the reset action of the plate spring, the connecting plate drives the adjusting block to move and reset, the connecting plate drives the first telescopic inner shaft and the second telescopic inner shaft to move and reset in the direction of the adjusting block, a second gear on the second telescopic inner shaft is disengaged from a second rack, and a second pinion is disengaged from a direction-changing gear; and in the process that the second gear is disengaged from the second rack, the first gear on the first telescopic inner shaft is engaged with the first rack. Fifthly, when the second gear is completely disengaged from the second rack, the second pinion is completely disengaged from the direction-changing gear, and the first gear is completely engaged with the first rack.

For the adjustment mechanism: for the design of third guide block, the third guide block slides along with the sliding strip, and the third guide block can guarantee that the sliding strip slides stably in the third sliding groove.

The inclined plane of trigger plate and above-mentioned regulating block cooperatees, and the layering is with the inclined plane matched with effect on the sliding strip: first, when the ramp on the slider is not compressed, the third spring is uncompressed and the trigger plate does not compress the ramp of the adjustment block. Secondly, after the layering extrudees the inclined plane on the slide bar, the slide bar removes to the direction of triggering the board, and the third guide block moves along with the slide bar, and the third spring is compressed, triggers the inclined plane of board extrusion regulating block. Thirdly, after the pressing strip does not extrude the inclined plane on the sliding strip any more, under the reset action of the third spring, the third guide block drives the sliding strip to move and reset, and the trigger plate does not extrude the inclined plane of the adjusting block any more.

For the steering mechanism: through rotating the handle, the handle drives the rotation of the telescopic inner rod through the adjusting rod, the telescopic inner rod drives the rotating block to rotate through the telescopic outer sleeve, and then the rotating block drives the front wheel to rotate through the front shaft. The telescopic inner rod is arranged in the circular hole of the moving plate through the bearing, and the moving plate is fixed by the two second telescopic rods, so that the moving plate cannot rotate when the telescopic inner rod rotates; when the telescopic inner rod moves axially, the moving plate can move along with the telescopic inner rod. The ring dish cooperatees with two C type flexure strips, ring dish and two limiting plate matched with effect: firstly, when the ring disc is positioned at the upper end of the C-shaped elastic sheet, the ring disc and the C-shaped elastic sheet are in downward pressing contact fit, and the position of a moving plate on the telescopic inner rod is at the moment, so that a pressing strip on the moving plate cannot press the inclined plane of the sliding strip; secondly, when the adjusting rod moves downwards under large force, the ring disc extrudes the C-shaped elastic sheet, the C-shaped elastic sheet gradually becomes flat, the ring disc can easily cross the C-shaped elastic sheet, and the ring disc can be positioned at the lower end of the C-shaped elastic sheet; thirdly, after the ring disc can cross the C-shaped elastic piece and is positioned at the lower end of the C-shaped elastic piece, the C-shaped elastic piece resets, the ring disc is blocked by the limiting plate, and therefore the ring disc cannot be pressed down and is maintained at the position blocked by the limiting plate; fourth, when the ring plate needs to be returned to the upper end of the C-shaped elastic piece, the ring plate needs to go over the C-shaped elastic piece with a large force.

The lower surface of the brake plate is provided with the friction surface with a large friction coefficient so as to ensure that the brake plate can generate large static friction force after contacting with the ground, so that the temporary guardrail can not be easily pushed.

The temporary guardrail has the beneficial effects that:

1. the temporary guardrail can achieve the braking effect of the traditional temporary guardrail and prevent the temporary guardrail from being easily pushed. When the temporary guardrail is still pushed after braking, only the braking plate can be seriously abraded and the wheels cannot be seriously abraded; compared with the cost that the wheel needs to be replaced after being seriously worn in the traditional temporary guardrail, the replacement cost of the brake plate is far lower than the cost of replacing the wheel, and the cost of saving the temporary guardrail and replacing the brake part is achieved.

2. When the temporary guardrail is still pushed by external force after braking, the front wheels and the rear wheels can still roll, and only the braking plate is abraded, so that the abrasion condition caused by the fact that the wheels slide on the ground in a non-rotating mode after the wheels are braked by the traditional temporary guardrail is avoided, the condition that the wheels are abraded into a non-circular shape is avoided, and the wheels can ensure that the temporary guardrail can walk stably.

3. The down-pressure energy required by the braking of the temporary guardrail is stored in the second spring when the rear wheel travels, and the large down-pressure is not required to be specially provided for the braking plate; compared with the traditional temporary guardrail requiring larger external downward pressure during braking, the temporary guardrail is convenient, quick and labor-saving to brake.

4. When the temporary guardrail needs to be braked, only the handle needs to be pressed down, and the handle can also realize the steering function, so that the handle has two functions. To the user, when braking to interim guardrail, the handle just can reach the braking effect by the way of pushing down to reach the effect of key braking, improved the convenience that interim guardrail used greatly.

Drawings

Fig. 1 is an overall schematic view of a temporary guard rail.

Fig. 2 is a schematic view illustrating the installation of the fourth fixing plate and the guard rail.

Fig. 3 is a schematic view of the structure of the bottom surface of the base.

FIG. 4 is a schematic view of the brake mechanism coupled to the belt.

FIG. 5 is a schematic view of a first pulley installation.

FIG. 6 is a schematic view of the one-way clutch and second pulley installation.

FIG. 7 is a schematic view of a belt installation.

FIG. 8 is a schematic view of the connection plate being connected to the first inner telescoping shaft and the second inner telescoping shaft, respectively.

Fig. 9 is a schematic view of the engagement of the first pinion gear and the first bull gear.

Fig. 10 is a schematic view of the third gear and the third rack being engaged.

Fig. 11 is a schematic cross-sectional view of a rectangular guide cylinder.

Fig. 12 is a schematic sectional front view of the first sliding plate mounted to the rectangular guide cylinder.

Fig. 13 is a cross-sectional view of the first fixing plate.

Fig. 14 is a schematic view of the mounting of the first and second racks.

Fig. 15 is a sectional view showing the installation of the second spring and the second guide shoe.

Fig. 16 is a schematic view of a first gear engaged with a first rack and a second gear engaged with a second rack.

Fig. 17 is a schematic bottom view of fig. 16.

Figure 18 is a leaf spring installation schematic.

Fig. 19 is a schematic view of a three-dimensional view (a) of the tooth and a plan view (b) of the tooth.

Fig. 20 is a cross-sectional schematic view of the third guide shoe and third spring installation.

Fig. 21 is a sectional view of the third fixing plate.

Fig. 22 is a schematic view of trigger plate installation.

FIG. 23 is a schematic view of the engagement of the compression bar with the slider bar and the engagement of the trigger plate with the adjustment block.

Fig. 24 is a schematic view of a steering mechanism.

Figure 25 is a rear wheel mounting schematic.

Fig. 26 is a schematic view of the adjustment lever installation.

FIG. 27 is a schematic view of the ring plate cooperating with the C-shaped resilient tab.

Number designation in the figures: 1. protecting the fence; 2. a base; 3. a rear wheel; 4. a brake mechanism; 5. an adjustment mechanism; 6. a steering mechanism; 7. a front wheel; 8. a first support plate; 9. a rear axle; 10. a first pulley; 12. a belt; 15. a rectangular support ring; 16. a second fixing plate; 17. a first fixing plate; 18. a rectangular guide cylinder; 19. a third support plate; 20. a second support plate; 21. a one-way clutch; 22. a fixing hole; 23. a first rotating shaft; 24. a second pulley; 25. a first pinion gear; 26. a first telescopic shaft; 27. a first rotating sleeve; 28. a first telescoping inner shaft; 29. a first bull gear; 30. a first gear; 31. a connecting plate; 32. a second gear; 33. a second telescopic shaft; 34. a second rotating sleeve; 35. a second telescoping inner shaft; 36. a second pinion gear; 37. a change gear; 38. a second bull gear; 39. a third gear; 40. a second rotating shaft; 41. an adjusting block; 42. a brake plate; 43. a third rack; 44. a first guide block; 45. a first sliding plate; 46. a first spring; 47. a first chute; 48. a first guide groove; 49. a second chute; 50. a second guide groove; 51. a second sliding plate; 52. a second guide block; 53. a second spring; 54. a first rack; 55. a second rack; 56. a bevel; 57. a plate spring; 59. teeth; 60. sharp corners; 61. a trigger plate; 62. a slide bar; 63. a third fixing plate; 64. a third guide block; 65. a third spring; 66. a third guide groove; 67. a third chute; 70. moving the plate; 71. layering; 72. a handle; 73. adjusting a rod; 74. a fourth fixing plate; 75. a fifth fixing plate; 76. a second telescopic rod; 77. a fixed block; 78. a sixth fixing plate; 79. a first telescopic rod; 80. rotating the block; 81. a front axle; 82. a telescopic outer sleeve; 83. a telescopic inner rod; 84. a ring plate; 85. a seventh fixing plate; 86. a limiting plate; 87. a C-shaped elastic sheet.

Detailed Description

As shown in fig. 1, 3 and 5, it comprises a guard rail 1, a base 2, rear wheels 3, a braking mechanism 4, an adjusting mechanism 5, a steering mechanism 6, front wheels 7, a first supporting plate 8, a rear axle 9, a first belt pulley 10 and a belt 12, as shown in fig. 1 and 2, wherein the guard rail 1 is mounted on the upper surface of the base 2; the lower surface of the base 2 is provided with a brake mechanism 4; as shown in fig. 3, two first supporting plates 8 are symmetrically mounted on the lower surface of one end of the base 2, as shown in fig. 1, and a steering mechanism 6 is mounted on the other end; two front wheels 7 are mounted on the steering mechanism 6; as shown in fig. 1, an adjusting mechanism 5 is mounted on the side surface of the base 2; as shown in fig. 4 and 5, the rear shaft 9 is mounted in the circular holes of the two first support plates 8 through bearings, and both ends of the rear shaft 9 penetrate through the two first support plates 8; two rear wheels 3 are symmetrically arranged at two ends of the rear shaft 9; a first belt pulley 10 is mounted on the rear shaft 9, and the first belt pulley 10 is positioned between the two first support plates 8; one end of the belt 12 is mounted on the first pulley 10 and the other end is mounted on the brake mechanism 4.

As shown in fig. 4, 6, 8 and 16, the braking mechanism 4 includes a rectangular support ring 15, a second fixed plate 16, a first fixed plate 17, a rectangular guide tube 18, a third support plate 19, a second support plate 20, a one-way clutch 21, a fixed hole 22, a first rotating shaft 23, a second pulley 24, a first pinion 25, a first telescopic shaft 26, a first bull gear 29, a plate spring 57, a first gear 30, a connecting plate 31, a second gear 32, a second telescopic shaft 33, a second pinion 36, a change gear 37, a second bull gear 38, a third gear 39, a second rotating shaft 40, an adjusting block 41, a braking plate 42, a third rack 43, a first guide block 44, a first sliding plate 45, a first spring 46, a first sliding slot 47, a first guide slot 48, a second sliding slot 49, a second guide slot 50, a second sliding plate 51, a second guide block 52, a second spring 53, a first rack 54, a second rack 55, A slope 56, as shown in fig. 3, wherein the first fixing plate 17, the second supporting plate 20, the third supporting plate 19, the rectangular guide cylinder 18 and the second fixing plate 16 are installed at the middle of the lower surface of the base 2; the rectangular guide cylinder 18 is positioned between the first fixing plate 17 and the third supporting plate 19; the second support plate 20 is close to the first support plate 8, and the second support plate 20 is positioned between the third support plate 19 and the first support plate 8; the second fixing plate 16 is close to the side surface of the base 2; the second support plate 20 is provided with a through fixing hole 22; as shown in fig. 8 and 16, the first telescopic shaft 26 is composed of a first rotating sleeve 27 and a first telescopic inner shaft 28, and the first telescopic inner shaft 28 drives the first rotating sleeve 27 to rotate; as shown in fig. 8 and 9, a one-way clutch 21 is mounted on the outer circumferential surface of the first rotating shaft 23; as shown in fig. 6, the outer circumferential surface of the one-way clutch 21 is fixedly installed in the fixing hole 22 of the second support plate 20; as shown in fig. 7 and 9, the first telescopic inner shaft 28 is provided with a first gear 30; a first gearwheel 29 is mounted on the first rotating sleeve 27, and the first gearwheel 29 is located between the one-way clutch 21 and the first gearwheel 30; as shown in fig. 6, the first rotating shaft 23 is bearing-mounted in a circular hole of the second support plate 20, and the first rotating shaft 23 is located at the lower side of the first telescopic shaft 26; the second pulley 24 and the first pinion 25 are both mounted on the first rotating shaft 23, and the second pulley 24 is located between the second support plate 20 and the first pinion 25; as shown in fig. 9, the first pinion gear 25 is engaged with the first bull gear 29; as shown in fig. 8 and 16, the second telescopic shaft 33 is composed of a second rotating sleeve 34 and a second telescopic inner shaft 35, and the second telescopic inner shaft 35 drives the second rotating sleeve 34 to rotate; as shown in fig. 8, the second rotating sleeve 34 is bearing-mounted in the circular hole of the third support plate 19; the second pinion 36 and the second gear 32 are both mounted on the second telescopic inner shaft 35, and the second pinion 36 is located between the second gear 32 and the second rotating sleeve 34; the change gear 37 is mounted on the third support plate 19 through a shaft; the second rotating shaft 40 is mounted in a circular hole of the third support plate 19 through a bearing; the third gear 39 and the second gearwheel 38 are both mounted on the second rotating shaft 40, and the third gear 39 is located between the second gearwheel 38 and the third supporting plate 19; the change gear 37 is located between the second gearwheel 38 and the second inner telescopic shaft 35; the change gear 37 is meshed with the second gearwheel 38; the change gear 37 is engaged with the second pinion gear 36; as shown in fig. 8, one end of the connecting plate 31 is mounted on the end of the first telescopic inner shaft 28 far from the first rotating sleeve 27, and the other end is mounted on the end of the second telescopic inner shaft 35 far from the second rotating sleeve 34; as shown in fig. 3 and 9, a rectangular support ring 15 is mounted at one end of the second fixing plate 16 away from the base 2; as shown in fig. 9 and 18, the adjusting block 41 is installed in the rectangular support ring 15 by a sliding fit manner, and both ends of the adjusting block 41 penetrate through the rectangular support ring 15; one end of the adjusting block 41 is fixedly installed on the plate surface of the connecting plate 31 far away from the first telescopic inner shaft 28, and the other end is provided with an inclined surface 56; one end of each of the two plate springs 57 is mounted on both side surfaces of the rectangular support ring 15, and the other end is mounted on the connecting plate 31; two plate springs 57 are distributed on both sides of the adjusting block 41; as shown in fig. 11, the rectangular guide cylinder 18 has a first slide groove 47 therein; two first guide grooves 48 are symmetrically formed on two sides of the first sliding groove 47; as shown in fig. 10, two first guide blocks 44 are symmetrically installed on both sides of one end of the first sliding plate 45, and the brake plate 42 is installed on the other end; a third rack 43 is mounted on the side surface of the first sliding plate 45; as shown in fig. 10, 11 and 12, the first sliding plate 45 is mounted in the first sliding slot 47 of the rectangular guide cylinder 18 by means of sliding fit; one end of the first spring 46 is mounted on the first sliding plate 45, and the other end is mounted on the bottom surface of the first sliding groove 47, and the first spring 46 is located in the first sliding groove 47 of the rectangular guide cylinder 18; the two first guide blocks 44 are respectively installed in the two first guide grooves 48 in a sliding fit manner; the third rack 43 slides in the rectangular guide cylinder 18; the third gear 39 is engaged with the third rack 43; as shown in fig. 13, a through second sliding slot 49 is formed on the plate surface of the first fixing plate 17 away from the base 2; two second guide grooves 50 are symmetrically formed in two sides of the second sliding groove 49; as shown in fig. 14, two second guide blocks 52 are symmetrically installed on both sides of the second sliding plate 51; as shown in fig. 13, 14 and 15, the second sliding plate 51 is mounted in the second slide groove 49 of the first fixed plate 17 by a sliding fit; the two second guide blocks 52 are respectively installed in the two second guide grooves 50 in a sliding fit manner; one ends of the two second springs 53 are respectively mounted on the two second guide blocks 52, and the other ends are respectively mounted on the groove surfaces of the two second guide grooves 50; two second springs 53 are respectively located in the two second guide grooves 50; as shown in fig. 14 and 16, a first rack 54 and a second rack 55 are mounted on the lower surface of the second sliding plate 51; the first rack 54 and the second rack 55 are distributed along the length direction of the second sliding plate 51, as shown in fig. 16 and 17, and a space is formed between the first rack 54 and the second rack 55; the first gear 30 is engaged with the first rack 54; the second gear 32 is engaged with the second rack 55.

As shown in fig. 7, one end of the belt 12 is mounted on the first pulley 10, and the other end is mounted on the second pulley 24.

The steering mechanism 6 has a function of adjusting the steering of the front wheels 7; the adjusting mechanism 5 makes the adjusting block 41 slide in the rectangular supporting ring 15, so as to achieve the purpose of generating displacement of the adjusting block 41.

The steering mechanism 6 also has a function of controlling the operation of the adjustment mechanism 5 so that the adjustment block 41 is adjusted in displacement after the operation of the adjustment mechanism 5.

As shown in fig. 20 and 23, the adjusting mechanism 5 includes a trigger plate 61, a sliding bar 62, a third fixing plate 63, a third guide block 64, a third spring 65, a third guide groove 66, a third sliding groove 67, and an inclined surface 56, as shown in fig. 2 and 3, wherein the third fixing plate 63 is mounted on the side surface of the base 2; as shown in fig. 21, a third slide groove 67 is formed in the third fixing plate 63; two third guide grooves 66 are symmetrically formed in two sides of the third sliding groove 67; as shown in fig. 22, two third guide shoes 64 are symmetrically installed on both sides of the slide bar 62; as shown in fig. 20, 21 and 22, the slide bar 62 is mounted in the third slide groove 67 of the third fixing plate 63 by a slide fit; the two third guide blocks 64 are respectively installed in the two third guide grooves 66 in a sliding fit manner; one ends of the two third springs 65 are respectively installed on the two third guide blocks 64, and the other ends are respectively installed on the groove surfaces of the two third guide grooves 66; the two third springs 65 are respectively positioned in the two third guide grooves 66; as shown in fig. 22, one end of the slide bar 62 has a slope 56, and the other end is mounted with a trigger plate 61; the trigger plate 61 is matched with the inclined surface 56 of the regulating block 41; the inclined surface 56 of the slide bar 62 cooperates with the above-mentioned steering mechanism 6.

As shown in fig. 1 and 24, the steering mechanism 6 includes a moving plate 70, a pressing bar 71, a handle 72, an adjusting rod 73, a fourth fixing plate 74, a fifth fixing plate 75, a second telescopic rod 76, a fixing block 77, a sixth fixing plate 78, a first telescopic rod 79, a rotating block 80, a front shaft 81, a ring plate 84, a seventh fixing plate 85, a limiting plate 86, and a C-shaped elastic sheet 87, as shown in fig. 2, wherein the fourth fixing plate 74 is mounted on an upper surface of one end of the base 2 away from the rear wheel 3; as shown in fig. 2 and 3, a sixth fixing plate 78 is mounted on the lower surface of the end of the base 2 far from the rear wheel 3 through a fixing block 77; as shown in fig. 24 and 27, two seventh fixing plates 85 are symmetrically mounted on the fourth fixing plate 74, and the two seventh fixing plates 85 are located at one end of the fourth fixing plate 74 far from the base 2; as shown in fig. 24, the fifth fixing plate 75 is installed at an intermediate position of the fourth fixing plate 74; the mounting surface of the fifth fixing plate 75 is the same as the mounting surface of the seventh fixing plate 85; as shown in fig. 24 and 26, one end of each of the two second telescopic rods 76 is mounted on the lower surface of the fifth fixing plate 75, and the other end is mounted with the moving plate 70; the two second telescopic rods 76 are symmetrically distributed on the moving plate 70; a through round hole is formed in the middle of the moving plate 70 and is positioned between the two second telescopic rods 76; as shown in fig. 23 and 26, one end of the bead 71 is mounted on the side of the moving plate 70; as shown in fig. 25, the first telescopic rod 79 is composed of a telescopic outer sleeve 82 and a telescopic inner rod 83, and the telescopic inner rod 83 drives the telescopic outer sleeve 82 to rotate; the telescopic outer sleeve 82 is arranged in a round hole of the sixth fixing plate 78 through a bearing, and two ends of the telescopic outer sleeve 82 penetrate out of the sixth fixing plate 78; as shown in fig. 26, the telescopic inner rod 83 is mounted in a circular hole of the moving plate 70 through a bearing, and the telescopic inner rod 83 penetrates through the moving plate 70; as shown in fig. 25, a rotating block 80 is fixedly installed at one end of the telescopic outer sleeve 82 far away from the telescopic inner rod 83; two front shafts 81 are symmetrically arranged on two sides of the rotating block 80; as shown in fig. 24, one end of the adjusting rod 73 is provided with a handle 72, and the other end passes through the fifth fixing plate 75 and is fixedly connected with one end of the telescopic inner rod 83; as shown in fig. 24 and 27, the ring plate 84 is fixedly mounted on the adjusting rod 73, and the ring plate 84 is located between the handle 72 and the fifth fixing plate 75; as shown in fig. 27, two C-shaped elastic pieces 87 are respectively mounted on the two seventh fixing plates 85 in a symmetrical manner; the two limit plates 86 are respectively mounted on the two seventh fixing plates 85 in a symmetrical manner; the two C-shaped elastic pieces 87 are positioned between the two seventh fixing plates 85; the two limit plates 86 are located between the two seventh fixing plates 85; the limiting plate 86 is positioned at the lower side of the C-shaped elastic sheet 87; the ring disc 84 is matched with two C-shaped elastic sheets 87; the ring disc 84 cooperates with two retainer plates 86.

As shown in fig. 25, the two front wheels 7 are mounted on the two front axles 81, respectively; as shown in fig. 23, the bead 71 engages the ramp 56 on the slider bar 62.

The teeth 59 on the first rack 54, the second rack 55, the first gear 30, the second gear 32, the second pinion 36, and the direction-changing gear 37 are all the same, and as shown in fig. 19 (a), a three-dimensional view of the teeth 59 is shown, and as shown in fig. 19 (b), a plan view of the teeth 59 is shown, and for the teeth 59 of the first gear 30: the teeth 59 of the first gear 30 have not only the shape of conventional teeth 59, but also the teeth 59 of the first gear 30 have sharp corners 60 at both ends. The shape of the tooth 59 is designed in such a way that: when the first gear 30 moves along the axial direction to reengage the first rack 54, the sharp corners 60 on the teeth 59 of the present invention can enable the teeth 59 on the first gear 30 to be smoothly inserted into the gap between two adjacent teeth 59 on the first rack 54, so that the first gear 30 and the first gear 30 are smoothly engaged, thereby avoiding the situation that the teeth 59 on the first gear 30 cannot be inserted into the gap between two adjacent teeth 59 on the first rack 54, and further avoiding the situation that the first gear 30 cannot be engaged with the first rack 54 when moving axially. The design of the teeth 59 also allows the second gear 32 to mesh smoothly with the second rack 55 during axial movement. The design of the teeth 59 also enables the second pinion 36 to mesh smoothly with the direction-changing gear 37 during axial movement.

As shown in fig. 8, the diameter of the first small gear 25 is smaller than that of the first large gear 29. The design is that: when the first pinion 25 drives the first telescopic shaft 26 to rotate through the first gearwheel 29 and the first telescopic shaft 26 drives the first gear 30 to rotate, the torque transmitted to the first gear 30 by the first pinion 25 is increased, the rotating speed of the first gear 30 is lower than that of the first pinion 25, and the first gear 30 achieves the effects of speed reduction and torque increase.

As shown in fig. 8, the diameter of the direction changing gear 37 is smaller than that of the second large gear 38; the second small gear 36 has a smaller diameter than the second large gear 38. The design is that: when the second small gear 36 drives the second large gear 38 to rotate through the direction changing gear 37 and the second large gear 38 drives the third gear 39 to rotate through the second rotating shaft 40, the torque transmitted to the third gear 39 by the second small gear 36 is increased, and the rotating speed of the third gear 39 is lower than that of the second small gear 36, so that the third gear 39 achieves the effects of speed reduction and torque increase.

The rubber handle 72 sleeve is arranged on the handle 72, and the rubber handle 72 sleeve is provided with an anti-skid structure.

The C-shaped elastic piece 87 is made of a metal material.

The first spring 46 is an extension spring; the second spring 53 is an extension spring; the third spring 65 is a compression spring.

The working process of the invention is as follows: the factory setting of the temporary guardrail is as follows: the inclined surface 56 of the adjusting block 41 is not pressed, the plate spring 57 is in a natural state, as shown in fig. 16 and 17, the first gear 30 is meshed with one end of the first rack 54 far away from the second rack 55, the second gear 32 and the second pinion 36 are positioned on both sides of the second rack 55, and neither the second gear 32 nor the second pinion 36 is meshed with the second rack 55. The second spring 53 is in a natural state. As shown in fig. 10, the third gear 39 is engaged with the third rack 43, and the brake plate 42 is spaced from the ground. The third spring 65 is in a natural state, as shown in fig. 23, and the inclined surface 56 on the slide bar 62 is not pressed. As shown in fig. 27, when the ring disc 84 is located at the upper end of the C-shaped elastic piece 87, the ring disc 84 and the C-shaped elastic piece 87 are in press-contact engagement, and the moving plate 70 on the telescopic inner rod 83 is located at such a position that the pressing strip 71 on the moving plate 70 does not press the inclined surface 56 of the sliding bar 62.

The rear wheels 3 of the temporary guard rail of the present invention can only travel forward, but cannot travel backward. When the temporary guard rail needs to be moved forward, the user pulls the handle 72 to drag the temporary guard rail of the present invention to walk, and as shown in fig. 5, when the rear wheel 3 is moved forward, the rear wheel 3 is rotated counterclockwise at this time. When the temporary guardrail of the invention needs to turn, a user rotates the handle 72, the handle 72 of the handle 72 drives the telescopic inner rod 83 to rotate through the adjusting rod 73, the telescopic inner rod 83 drives the rotating block 80 to rotate through the telescopic outer sleeve 82, the rotating block 80 drives the front wheels 7 to rotate through the front shaft 81, and the steering of the temporary guardrail of the invention is adjusted by the rotation of the front wheels 7.

As shown in fig. 5, when the rear wheel 3 of the temporary guard rail of the present invention walks forward, the rear wheel 3 rotates counterclockwise at this time; the rear wheel 3 drives the first belt pulley 10 to rotate through the rear shaft 9, and the first belt pulley 10 drives the second belt pulley 24 to rotate anticlockwise through the belt 12. The second pulley 24 drives the first pinion 25 to rotate via the first rotating shaft 23, the first pinion 25 drives the first telescopic shaft 26 to rotate clockwise via the first large gear 29, and as shown in fig. 16, the first telescopic shaft 26 drives the first gear 30 to rotate clockwise. The first gear 30 drives the first rack 54 to move away from the second rack 55, the first rack 54 drives the second sliding plate 51 to move, the second guide block 52 and the second rack 55 move along with the second sliding plate 51, and the second spring 53 is stretched. As the first gear 30 continues to toggle the first rack 54, the first gear 30 will toggle to an end of the first rack 54 near the second rack 55, and then continued clockwise rotation of the first gear 30 will maintain the first rack 54 at the position toggled to the maximum distance. Due to the spacing between the first rack 54 and the second rack 55, the first gear 30 does not mesh with the second rack 55. The second rack 55 is positioned to allow the second gear 32 to move into meshing relationship with the second rack 55 when the first gear 30 shifts the first rack 54 to the maximum distance position.

When the temporary guard rail of the present invention is stopped, since the one-way clutch 21 restricts the first telescopic shaft 26 from rotating counterclockwise, the first gear 30 does not rotate counterclockwise, and the first rack 54 is still maintained at a position shifted to the maximum distance by the first gear 30.

When the temporary guard rail of the present invention needs to be braked, a user presses down the handle 72 with a large force, and the handle 72 causes the adjustment lever 73 to be pressed down; when the adjusting rod 73 moves downwards under a large force, the ring disc 84 presses the C-shaped elastic piece 87, the C-shaped elastic piece 87 gradually becomes flat, the ring disc 84 can easily cross the C-shaped elastic piece 87, and the ring disc 84 can be positioned at the lower end of the C-shaped elastic piece 87; after the ring plate 84 can get over the C-shaped elastic piece 87 and is located at the lower end of the C-shaped elastic piece 87, the C-shaped elastic piece 87 is reset, the ring plate 84 is blocked by the limiting plate 86, and thus the ring plate 84 cannot be pressed down and is maintained at the position blocked by the limiting plate 86. In the process that the ring disc 84 passes over the C-shaped elastic piece 87 by pressing down the adjusting rod 73, the telescopic inner rod 83 is pressed down by the adjusting rod 73, the moving plate 70 moves downwards along with the telescopic inner rod 83, and the second telescopic rod 76 is stretched. Downward movement of the moving plate 70 so that the bead 71 of the moving plate 70 presses the slope 56 of the slide bar 62; when the pressing bar 71 presses the inclined surface 56 of the sliding bar 62, the sliding bar 62 moves towards the trigger plate 61, the third guide block 64 moves along with the sliding bar 62, the third spring 65 is compressed, and the trigger plate 61 presses the inclined surface 56 of the adjusting block 41. After the downward movement of the moving plate 70 is stopped, the pressing bar 71 is still in a state of pressing the inclined surface 56 of the slide bar 62, so that the trigger plate 61 can continuously press the inclined surface 56 of the adjusting block 41. When the inclined surface 56 of the adjusting block 41 is pressed, the adjusting block 41 drives the connecting plate 31 to move towards the first telescopic shaft 26, the first telescopic inner shaft 28 and the second telescopic inner shaft 35 are compressed, the plate spring 57 is compressed, as shown in fig. 8 and 17, the first gear 30 on the first telescopic inner shaft 28 is disengaged from the first rack 54, the second gear 32 on the second telescopic inner shaft 35 is engaged with the second rack 55, and the second pinion 36 on the second telescopic inner shaft 35 is engaged with the direction-changing gear 37 in the process that the first gear 30 is disengaged from the first rack 54. When the first gear 30 is completely disengaged from the first rack 54, the second gear 32 is completely engaged with the second rack 55, and the second pinion gear 36 is completely engaged with the direction-changing gear 37.

Since the first gear 30 is disengaged from the first rack 54, the first rack 54 cannot be maintained in the position shifted to the maximum distance by the first gear 30. At this time, the second spring 53 in the stretched state is reset, the second guide block 52 drives the second sliding plate 51 to move and reset, the first rack 54 and the second rack 55 move and reset along with the second sliding plate 51, and the second rack 55 moves and resets to drive the second gear 32 to rotate counterclockwise. The second gear 32 drives the second pinion 36 to rotate anticlockwise through the second telescopic inner shaft 35; the second pinion 36 drives the direction-changing gear 37 to rotate clockwise, the direction-changing gear 37 passes through the second gearwheel 38, as shown in fig. 10 and 12, the second rotating shaft 40 drives the third gear 39 to rotate clockwise, the third gear 39 drives the third rack 43 to move downwards, the third rack 43 drives the first sliding plate 45 to slide downwards in the rectangular guide cylinder 18, the brake plate 42 follows the first sliding plate 45 to move downwards, and the first spring 46 is stretched. After the braking plate 42 on the first sliding plate 45 contacts with the ground, at this time, the second spring 53 is not reset, so the second rack 55 on the second sliding plate 51 still gives a large pulling power to the second gear 32, and after a series of transmissions, the second gear 32 makes the third gear 39 still give a large pulling power to the third rack 43; therefore, after the brake plate 42 is contacted with the ground, the third rack 43 and the first sliding plate 45 still have larger downward pressure, so that larger pressure exists between the brake plate 42 and the ground, larger static friction force exists between the brake plate 42 and the ground, and the temporary guardrail can not be easily pushed; finally, the temporary guardrail of the invention has the effect that the wheels on the traditional temporary guardrail are braked.

When the temporary guard rail of the present invention is not required to be braked, the user pulls the handle 72 with a large force, the handle 72 pulls the adjustment lever 73, the ring disc 84 on the adjustment lever 73 passes over the C-shaped elastic piece 87, and the ring disc 84 is finally left at the upper end of the C-shaped elastic piece 87 and the ring disc 84 is brought into pressing contact with the C-shaped elastic piece 87. After the adjustment lever 73 is pulled up, the adjustment lever 73 causes the telescopic inner lever 83 to be pulled up, and the slide plate is pulled up, and the bead 71 moves following the slide plate. The inclined plane 56 on the sliding bar 62 is no longer pressed by the pressing bar 71, and under the reset action of the third spring 65, the third guide block 64 drives the sliding bar 62 to move and reset, and the trigger plate 61 no longer presses the inclined plane 56 of the adjusting block 41. When the inclined plane 56 of the adjusting block 41 is not pressed any more, under the reset action of the plate spring 57, the connecting plate 31 drives the adjusting block 41 to move and reset, the connecting plate 31 drives the first telescopic inner shaft 28 and the second telescopic inner shaft 35 to move and reset towards the direction of the adjusting block 41, the second gear 32 on the second telescopic inner shaft 35 is disengaged from the second rack 55, and the second pinion 36 is disengaged from the change gear 37; during disengagement of the second gear 32 from the second rack 55, the first gear 30 on the first telescoping inner shaft 28 engages the first rack 54. When the second gear 32 is completely disengaged from the second rack 55, the first gear 30 is completely engaged with the first rack 54. After the first gear 30 is completely engaged with the first rack 54, since the one-way clutch 21 prevents the first gear 30 from rotating counterclockwise, the first rack 54 cannot move further and return, and the second spring 53 is extended to some extent. When the second pinion 36 is disengaged from the direction change gear 37, the third gear 39 no longer provides a downward driving force to the third rack 43, and then the first sliding plate 45 is moved and reset by the reset action of the first spring 46, and the brake plate 42 is moved and reset along with the first sliding plate 45.

In conclusion, the invention has the main beneficial effects that: after the braking plate is in compression joint with the ground, a larger static friction force exists between the braking plate and the ground, so that the temporary guardrail can not be easily pushed; finally, the temporary guardrail of the invention has the effect that the wheels on the traditional temporary guardrail are braked. In addition, when the temporary guardrail is still pushed by external force after braking, the front wheels and the rear wheels can still roll, and only the braking plate is abraded, so that the abrasion condition caused by the fact that the wheels slide on the ground in a non-rotating mode in the traditional temporary guardrail is avoided, the condition that the wheels are abraded into a non-circular shape is avoided, and the wheels can enable the temporary guardrail to walk stably; finally, the situation of replacing the front wheel and the rear wheel of the invention is avoided; compared with the cost of the wheel to be replaced after the wheel is seriously worn, the replacement cost of the brake plate after the wheel is seriously worn is far lower than the cost of replacing the wheel, and the cost of replacing the brake part of the temporary guardrail is saved.

Claims

1. A mobilizable interim guardrail for municipal works which characterized in that: the device comprises a protective guard, a base, rear wheels, a braking mechanism, an adjusting mechanism, a steering mechanism, front wheels, a first supporting plate, a rear shaft, a first belt pulley and a belt, wherein the protective guard is arranged on the upper surface of the base; the lower surface of the base is provided with a braking mechanism; the lower surface of one end of the base is symmetrically provided with two first supporting plates, and the other end of the base is provided with a steering mechanism; two front wheels are arranged on the steering mechanism; an adjusting mechanism is arranged on the side surface of the base; the rear shaft is arranged in the circular holes of the two first supporting plates through bearings, and two ends of the rear shaft penetrate through the two first supporting plates; two rear wheels are symmetrically arranged at two ends of the rear shaft; the first belt pulley is arranged on the rear shaft and is positioned between the two first supporting plates; one end of the belt is arranged on the first belt pulley, and the other end of the belt is arranged on the braking mechanism;

the brake mechanism comprises a rectangular support ring, a second fixed plate, a first fixed plate, a rectangular guide cylinder, a third support plate, a second support plate, a one-way clutch, a fixed hole, a first rotating shaft, a second belt pulley, a first pinion, a first telescopic shaft, a first bull gear, a plate spring, a first gear, a connecting plate, a second gear, a second telescopic shaft, a second pinion, a reversing gear, a second bull gear, a third gear, a second rotating shaft, an adjusting block, a brake plate, a third rack, a first guide block, a first sliding plate, a first spring, a first sliding chute, a first guide groove, a second sliding plate, a second guide block, a second spring, a first rack, a second rack and an inclined plane, the first fixing plate, the second supporting plate, the third supporting plate, the rectangular guide cylinder and the second fixing plate are all arranged in the middle of the lower surface of the base; the rectangular guide cylinder is positioned between the first fixing plate and the third supporting plate; the second supporting plate is close to the first supporting plate and is positioned between the third supporting plate and the first supporting plate; the second fixing plate is close to the side surface of the base; the second supporting plate is provided with a through fixing hole; the first telescopic shaft consists of a first rotating sleeve and a first telescopic inner shaft, and the first telescopic inner shaft drives the first rotating sleeve to rotate; a one-way clutch is arranged on the outer circular surface of the first rotating shaft; the outer circular surface of the one-way clutch is fixedly arranged in the fixing hole of the second supporting plate; a first gear is arranged on the first telescopic inner shaft; the first gearwheel is arranged on the first rotating sleeve and is positioned between the one-way clutch and the first gear; the first rotating shaft is arranged in a circular hole of the second supporting plate through a bearing and is positioned on the lower side of the first telescopic shaft; the second belt pulley and the first pinion are both arranged on the first rotating shaft, and the second belt pulley is positioned between the second support plate and the first pinion; the first small gear is meshed with the first large gear; the second telescopic shaft consists of a second rotating sleeve and a second telescopic inner shaft, and the second telescopic inner shaft drives the second rotating sleeve to rotate; the second rotating sleeve is arranged in a round hole of the third supporting plate through a bearing; the second pinion and the second gear are both arranged on the second telescopic inner shaft, and the second pinion is positioned between the second gear and the second rotating sleeve; the change gear is arranged on the third supporting plate through a shaft; the second rotating shaft is arranged in a circular hole of the third supporting plate through a bearing; the third gear and the second gearwheel are both arranged on the second rotating shaft, and the third gear is positioned between the second gearwheel and the third supporting plate; the change gear is positioned between the second gearwheel and the second telescopic inner shaft; the change gear is meshed with the second gearwheel; the change gear is matched with the second pinion; one end of the connecting plate is arranged at one end of the first telescopic inner shaft far away from the first rotating sleeve, and the other end of the connecting plate is arranged at one end of the second telescopic inner shaft far away from the second rotating sleeve; one end of the second fixing plate, which is far away from the base, is provided with a rectangular support ring; the adjusting block is arranged in the rectangular support ring in a sliding fit mode, and two ends of the adjusting block penetrate out of the rectangular support ring; one end of the adjusting block is fixedly arranged on the plate surface of the connecting plate far away from the first telescopic inner shaft, and the other end of the adjusting block is provided with an inclined surface; one end of each plate spring is arranged on two side surfaces of the rectangular support ring, and the other end of each plate spring is arranged on the connecting plate; the two plate springs are distributed on two sides of the adjusting block; the rectangular guide cylinder is provided with a first sliding groove; two first guide grooves are symmetrically formed in two sides of the first sliding groove; two first guide blocks are symmetrically arranged on two sides of one end of the first sliding plate, and a brake plate is arranged at the other end of the first sliding plate; a third rack is arranged on the side surface of the first sliding plate; the first sliding plate is arranged in the first sliding groove of the rectangular guide cylinder in a sliding fit mode; one end of the first spring is arranged on the first sliding plate, the other end of the first spring is arranged on the bottom surface of the first sliding chute, and the first spring is positioned in the first sliding chute of the rectangular guide cylinder; the two first guide blocks are respectively arranged in the two first guide grooves in a sliding fit manner; the third rack slides in the rectangular guide cylinder; the third gear is meshed with the third rack; a through second sliding chute is formed in the surface, away from the base, of the first fixing plate; two second guide grooves are symmetrically formed in two sides of the second sliding groove; two second guide blocks are symmetrically arranged on two sides of the second sliding plate; the second sliding plate is arranged in the second sliding groove of the first fixed plate in a sliding fit manner; the two second guide blocks are respectively arranged in the two second guide grooves in a sliding fit manner; one ends of the two second springs are respectively arranged on the two second guide blocks, and the other ends of the two second springs are respectively arranged on the groove surfaces of the two second guide grooves; the two second springs are respectively positioned in the two second guide grooves; a first rack and a second rack are arranged on the lower surface of the second sliding plate; the first rack and the second rack are distributed along the length direction of the second sliding plate, and a space is reserved between the first rack and the second rack; the first gear is matched with the first rack; the second gear is matched with the second rack;

one end of the belt is arranged on the first belt pulley, and the other end of the belt is arranged on the second belt pulley;

the steering mechanism has the function of adjusting the steering of the front wheels; the adjusting mechanism enables the adjusting block to slide in the rectangular supporting ring, so that the purpose of generating displacement of the adjusting block is achieved;

2. A removable temporary barrier for municipal works according to claim 1, wherein: the adjusting mechanism comprises a trigger plate, a sliding strip, a third fixing plate, a third guide block, a third spring, a third guide groove, a third sliding groove and an inclined plane, wherein the third fixing plate is arranged on the side surface of the base; a third through chute is arranged in the third fixing plate; two third guide grooves are symmetrically formed in two sides of the third sliding groove; two third guide blocks are symmetrically arranged on two sides of the sliding strip; the sliding strip is arranged in a third sliding groove of the third fixing plate in a sliding fit manner; the two third guide blocks are respectively arranged in the two third guide grooves in a sliding fit manner; one end of each of the two third springs is respectively arranged on the two third guide blocks, and the other end of each of the two third springs is respectively arranged on the groove surfaces of the two third guide grooves; the two third springs are respectively positioned in the two third guide grooves; one end of the sliding strip is provided with an inclined plane, and the other end of the sliding strip is provided with a trigger plate; the trigger plate is matched with the inclined plane of the adjusting block; the inclined plane of the sliding strip is matched with the steering mechanism.

3. A removable temporary barrier for municipal works according to claim 1, wherein: the steering mechanism comprises a movable plate, a pressing strip, a handle, an adjusting rod, a fourth fixed plate, a fifth fixed plate, a second telescopic rod, a fixed block, a sixth fixed plate, a first telescopic rod, a rotating block, a front shaft, a ring plate, a seventh fixed plate, a limiting plate and a C-shaped elastic sheet, wherein the fourth fixed plate is arranged on the upper surface of one end of the base, which is far away from the rear wheel; the sixth fixing plate is arranged on the lower surface of one end of the base far away from the rear wheel through a fixing block; the two seventh fixing plates are symmetrically arranged on the fourth fixing plate and are positioned at one end of the fourth fixing plate far away from the base; the fifth fixing plate is arranged at the middle position of the fourth fixing plate; the mounting surface of the fifth fixing plate and the mounting surface of the seventh fixing plate are the same; one end of each of the two second telescopic rods is arranged on the lower surface of the fifth fixing plate, and the other end of each of the two second telescopic rods is provided with the moving plate; the two second telescopic rods are symmetrically distributed on the moving plate; a through round hole is formed in the middle of the moving plate and is positioned between the two second telescopic rods; one end of the pressing bar is arranged on the side surface of the movable plate; the first telescopic rod consists of a telescopic outer sleeve and a telescopic inner rod, and the telescopic inner rod drives the telescopic outer sleeve to rotate; the telescopic outer sleeve is arranged in a round hole of the sixth fixing plate through a bearing, and two ends of the telescopic outer sleeve penetrate through the sixth fixing plate; the telescopic inner rod is arranged in a circular hole of the moving plate through a bearing and penetrates through the moving plate; a rotating block is fixedly arranged at one end of the telescopic outer sleeve far away from the telescopic inner rod; two front shafts are symmetrically arranged on two sides of the rotating block; one end of the adjusting rod is provided with a handle, and the other end of the adjusting rod penetrates through the fifth fixing plate and is fixedly connected with one end of the telescopic inner rod; the ring disc is fixedly arranged on the adjusting rod and is positioned between the handle and the fifth fixing plate; the two C-shaped elastic pieces are respectively arranged on the two seventh fixing plates in a symmetrical mode; the two limiting plates are respectively arranged on the two seventh fixing plates in a symmetrical mode; the two C-shaped elastic sheets are positioned between the two seventh fixing plates; the two limiting plates are positioned between the two seventh fixing plates; the limiting plate is positioned at the lower side of the C-shaped elastic sheet; the ring disc is matched with the two C-shaped elastic sheets; the ring disc is matched with the two limiting plates.

4. A removable temporary barrier for municipal works according to claim 2 or 3, wherein: the two front wheels are respectively arranged on the two front shafts; the pressing strip is matched with the inclined plane on the sliding strip.

5. A removable temporary barrier for municipal works according to claim 1, wherein: the teeth on the first rack, the second rack, the first gear, the second pinion and the change gear are all the same, and for the teeth of the first gear: the teeth of the first gear have the shape of the conventional teeth, and the teeth of the first gear have sharp corners at both ends.

6. A removable temporary barrier for municipal works according to claim 1, wherein: the diameter of the first small gear is smaller than that of the first big gear.

7. A removable temporary barrier for municipal works according to claim 1, wherein: the diameter of the change gear is smaller than that of the second gearwheel; the diameter of the second pinion gear is smaller than that of the second gearwheel.

8. A removable temporary barrier for municipal works according to claim 3, wherein: the handle is provided with a rubber handle sleeve, and the rubber handle sleeve is provided with an anti-skidding structure.

9. A removable temporary barrier for municipal works according to claim 3, wherein: the C-shaped elastic sheet is made of a metal material.

10. A removable temporary barrier for municipal works according to claim 2, wherein: the first spring is an extension spring; the second spring is an extension spring; the third spring is a compression spring.