CN111921122B

CN111921122B - High-reliability falling protector

Info

Publication number: CN111921122B
Application number: CN202010855012.8A
Authority: CN
Inventors: 赵甲佳; 王鹏; 周运波
Original assignee: Hangzhou Hetai Security Technology Co Ltd
Current assignee: Hangzhou Hetai Security Technology Co Ltd
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2021-05-14
Anticipated expiration: 2040-08-24
Also published as: CN111921122A

Abstract

The invention belongs to the technical field of falling protectors, and particularly relates to a high-reliability falling protector which comprises a shell, an elastic sleeve, a steel wire rope, a lock catch, a winding wheel, a ratchet wheel and a pawl. According to the anti-falling device, the limiting mechanisms, the clamping mechanisms, the ratchet wheels, the pawls, the cams, the trigger disc and the limiting wheels are arranged on the two sides of the winding wheel to improve the stability of the anti-falling device, and the anti-falling device can be locked no matter which side structure acts; the safety is better.

Description

High-reliability falling protector

Technical Field

The invention belongs to the technical field of falling protectors, and particularly relates to a high-reliability falling protector.

Background

The speed difference safety catcher can quickly brake and lock falling objects within a limited distance; through the equipment, constructors can freely and safely walk along the direction of the guide rail. In case of human body falling due to the lack of feet in the using process, the pulling-out speed of the safety rope is accelerated, the control system in the device automatically locks immediately, the falling of the safety rope is enabled to be not more than 0.2m, the impact force is less than 2942N, no harm is caused to the human body, the hung worker and the hung workpiece can be prevented from accidentally falling through the device, and the life safety of the worker and the damage to the hung workpiece object can be effectively protected.

However, sometimes the strength of the ratchet wheel and the pawl of the falling protector is not enough, the ratchet wheel and the pawl are deformed and damaged in the using process, and the safety can not be better ensured.

In order to improve safety in such a case, there are generally two methods:

one is to increase the thickness of the pawl and the ratchet wheel and to strengthen the pawl and the ratchet wheel, but this method increases the thickness of the safety hook and increases the moment of inertia of the ratchet wheel and the pawl, which causes inconvenience in carrying and reduces the susceptibility to seizing.

The other is to use high strength material when making the ratchet and pawl, which can reduce the quality, but it will increase the cost.

The invention designs a handle type safety catcher which can better ensure the safety under the condition of not increasing the thickness by changing the internal structure, and solves the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a high-reliability falling protector which is realized by adopting the following technical scheme.

A high-reliability falling protector comprises a shell, an elastic sleeve, a steel wire rope, a lock catch, a winding wheel, a ratchet wheel and a pawl, wherein the elastic sleeve is arranged on one side of the shell; the winding wheel is rotatably arranged in the shell through a second rotating shaft, a steel wire rope is wound on the winding wheel, one end of the steel wire rope penetrates out of the shell, and a lock catch is fixedly arranged on the outer side of the shell through an elastic sleeve; the ratchet wheel is fixedly arranged on the winding wheel, the pawl is arranged in the shell in a swinging mode, and the pawl is matched with the ratchet wheel; a plate spring for resetting the pawl and a limiting fixture block for limiting the pawl are arranged in the shell; the method is characterized in that: the number of the ratchet wheels arranged on the winding wheel is two, and the two ratchet wheels are symmetrically arranged on two sides of the winding wheel.

The structures installed on the two sides of the winding wheel are completely the same, and the cam is rotatably installed on the second rotating shaft on any side of the winding wheel; the pawl is arranged on the cam in a swinging mode, and a limiting clamping block corresponding to the pawl is fixedly arranged on the cam; one end of a plate spring corresponding to the pawl is fixedly arranged on the pawl, and the other end of the plate spring is fixedly arranged on the cam; the limiting mechanism is arranged in the shell and comprises a limiting arc block, the limiting arc block is slidably arranged in the shell, and a fourth reset spring is arranged between the limiting arc block and the shell; the limiting arc block has a limiting effect on the rotation of the cam; the outer circular surface of the trigger disc is provided with a concave surface area, and the trigger disc is fixedly arranged on one side of the cam; a return spring is arranged between the trigger plate and the shell; the clamping mechanism is arranged in the shell; the clamping mechanism consists of a sliding sleeve, a limiting block and a clamping rod, the sliding sleeve is arranged in the shell in a sliding mode, and a first return spring is arranged between the sliding sleeve and the shell; a cylinder is arranged on the sliding sleeve and matched with the trigger disc; one end of the limiting block is slidably arranged in the sliding sleeve, and a second return spring is arranged between one end of the limiting block in the sliding sleeve and the sliding sleeve; the limiting block is provided with a clamping groove; the clamping rod is slidably arranged on the shell, and a third return spring is arranged between the clamping rod and the shell; the clamping rod is matched with the clamping groove on the limiting block; the limiting wheel is provided with a limiting bulge, the limiting wheel is fixedly arranged on the second rotating shaft, and the limiting bulge on the limiting wheel is matched with the limiting block; a first scroll spring is arranged between the limiting wheel and the shell; when the limiting block is only stressed by the pressure of the second reset spring, when the limiting block extends out of the longest state from the sliding sleeve, the clamping groove of the limiting block just corresponds to the clamping rod, and when the clamping rod is matched with the clamping groove in the limiting block, the distance between one end of the limiting block, which is far away from the sliding sleeve, and the circle center of the limiting wheel is larger than the radius of the limiting wheel and smaller than the distance between the convex point of the limiting block and the circle center of the limiting wheel.

As a further improvement of the technology, the limiting wheel is provided with a fixed ring, the inner end of the first scroll spring is fixedly arranged on the shell, and the outer end of the scroll spring is fixedly arranged on the inner circular surface of the fixed ring.

As a further improvement of the technology, an arc chamfer is arranged between the concave surface formed on the trigger disc and the outer circular surface of the trigger disc, the angle of the concave surface area of the trigger disc is larger than 90 degrees, and in the initial state, the included angle between the end, firstly matched with the limiting block, of the concave surface of the trigger disc and the limiting block is 150 degrees in the rotating direction of the trigger disc when the steel wire rope is pulled out.

As a further improvement of the technology, two guide sleeves are fixedly arranged in the shell, and two guide rods are respectively arranged in the two guide sleeves in a sliding manner; the two sliding sleeves are fixedly arranged at one ends of the two guide rods, one ends of the two first reset springs are respectively and fixedly arranged on the two guide rods, and the other ends of the two first reset springs are respectively and fixedly arranged on the inner end faces of the two guide sleeves.

The two mounting sleeves are fixedly mounted on the shell, the two clamping rods are respectively and fixedly mounted with a mounting plate, one ends of the two third reset springs are respectively and fixedly mounted on the two mounting plates, and the other ends of the two third reset springs are respectively and fixedly mounted on the inner end faces of the two mounting sleeves.

As a further improvement of the technology, the limiting mechanism further comprises a guide slide bar, a fixed block and a limiting plate, wherein the fixed block is fixedly mounted on the shell, one end of the guide slide bar is fixedly mounted on the fixed block, the other end of the guide slide bar is fixedly mounted with the limiting plate, a limiting arc block is slidably mounted on the guide slide bar, one end of a fourth reset spring is fixedly mounted on the limiting arc block, and the other end of the fourth reset spring is fixedly mounted on the fixed block.

As a further improvement of the technology, two mounting rings are symmetrically mounted in the housing, inner ends of the two second scroll springs are fixedly mounted on the two trigger disks respectively, and outer ends of the two second scroll springs are fixedly mounted on inner circular surfaces of the two mounting rings respectively.

As a further improvement of the technology, the cam consists of a round surface and a convex surface, and the cam is matched with the limiting arc block through the round surface and the convex surface; in the initial state, the angle between the convex surface of the cam and the limiting arc block in the rotation direction of the cam when the steel wire rope is pulled out is 250-260 degrees.

As a further improvement of the technology, the two sliding sleeves are respectively and symmetrically provided with two guide rails which play a role in guiding the sliding sleeves.

As a further improvement of the present technology, the two pawls are rotatably mounted on the corresponding cams via a third rotating shaft, respectively.

As a further improvement of the present technology, the first return spring is an extension spring and has a pretension force; the second return spring is a compression spring and has pre-pressure; the third return spring is a compression spring and has pre-pressure; the fourth return spring is a compression spring.

Compared with the traditional falling protector technology, the design of the invention has the following beneficial effects:

1. the anti-falling device designed by the invention is locked and bears the locking force mainly through the limiting blocks and the limiting bulges on the limiting wheels, the designed limiting blocks and the limiting wheels have larger structural volumes and can ensure enough strength to lock, the aim of standby locking is achieved only after the structures of the limiting blocks and the limiting wheels fail through the method of matching the limiting arc blocks with the cam, and when the anti-falling device is locked through the standby structure, the anti-falling device needs to be replaced or the structures of the limiting blocks and the limiting wheels need to be maintained.

2. According to the anti-falling device, the limiting mechanisms, the clamping mechanisms, the ratchet wheels, the pawls, the cams, the trigger disc and the limiting wheels are arranged on the two sides of the winding wheel to improve the stability of the anti-falling device, and the anti-falling device can be locked no matter which side structure acts; the safety is better.

3. According to the anti-falling device designed by the invention, when the steel wire rope is pulled out, the winding wheel rotates, the winding wheel drives the ratchet wheel to rotate, and under the condition of higher speed, the ratchet wheel and the pawl are triggered.

4. According to the invention, the rapid high-sensitivity triggering can be met by designing the ratchet wheel pawl made of materials with conventional strength and smaller mass, and the final locking is carried out by utilizing the limiting block and the limiting wheel with large mass and high strength, so that the triggering reliability and the safety of locking with enough strength are achieved.

5. When the locking structures of the limiting blocks and the limiting wheels fail and are locked through the limiting arc blocks and the cam, the ratchet pawl bears the locking force, the mass of the falling protector is small due to the reliable triggering requirements of the ratchet and the pawl, the reliability of bearing the locking force for several times can be guaranteed, and in actual operation, after the falling protector bears the locking force through the ratchet pawl, the falling protector needs to be replaced or maintained, so that the ratchet pawl cannot bear the locking force for more than one time generally. Therefore, for the strength design of the ratchet wheel and the pawl, compared with the traditional ratchet wheel and pawl bearing the locking force, the strength design requirement of the ratchet wheel and pawl is lower.

Drawings

Fig. 1 is an external view of an entire part.

Fig. 2 is a schematic view of the overall component distribution.

Fig. 3 is a schematic view of the structure of the shell, the elastic sleeve and the lock catch.

Fig. 4 is a schematic view of the internal structure of the housing.

Fig. 5 is a schematic view of the installation of the internal structure of the housing.

Fig. 6 is a schematic view of a winding wheel structure.

Fig. 7 is a schematic view of the clamping mechanism and the limiting wheel.

Fig. 8 is a schematic view of a card mechanism.

Fig. 9 is a schematic view of the structure of the limiting wheel.

FIG. 10 is a ratchet and pawl installation schematic.

FIG. 11 is a schematic view of a second wrap spring installation.

Figure 12 is a schematic view of the cam and limit arc block mating.

FIG. 13 is a schematic view of the trigger plate and second shaft in combination.

Number designation in the figures: 1. a housing; 2. an elastic sleeve; 3. a wire rope; 4. locking; 5. a winding wheel; 6. a limiting wheel; 7. a trigger plate; 8. a limiting mechanism; 9. a card mechanism; 10. a first scroll spring; 11. a second scroll spring; 12. a cam; 13. a limiting bulge; 14. a fixing ring; 15. a guide rail; 16. a guide bar; 17. a guide sleeve; 18. a first return spring; 19. a sliding sleeve; 20. a second return spring; 21. a limiting block; 22. a cylinder; 23. a second rotating shaft; 24. a ratchet wheel; 25. a pawl; 26. a limiting clamping block; 27. a plate spring; 28. round surface; 29. a convex surface; 30. a limiting arc block; 31. a guide slide bar; 32. a fourth return spring; 33. a fixed block; 34. a limiting plate; 35. a third rotating shaft; 37. a concave surface; 41. a mounting ring; 42. a card slot; 43. a clamping rod; 44. installing a sleeve; 45. mounting a plate; 46. and a third return spring.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1 and 2, it comprises a shell 1, an elastic sleeve 2, a steel wire rope 3, a lock catch 4, a winding wheel 5, a ratchet wheel 24 and a pawl 25, wherein as shown in fig. 3, the elastic sleeve 2 is arranged on one side of the shell 1; as shown in fig. 5 and 6, the winding wheel 5 is rotatably mounted in the housing 1 through a second rotating shaft 23, as shown in fig. 4, a steel wire rope 3 is wound on the winding wheel 5, one end of the steel wire rope 3 penetrates out of the housing 1, and a lock catch 4 is fixedly mounted on the outer side of the housing 1 through an elastic sleeve 2; the ratchet wheel 24 is fixedly arranged on the winding wheel 5, the pawl 25 is arranged in the shell 1 in a swinging mode, and the pawl 25 is matched with the ratchet wheel 24; a plate spring 27 for resetting the pawl 25 and a limiting fixture block 26 for limiting the pawl 25 are arranged in the shell 1; the method is characterized in that: as shown in fig. 5, the winding wheel 5 has two ratchet wheels 24, and the two ratchet wheels 24 are symmetrically installed on both sides of the winding wheel 5.

The structure and the installation relation of the shell 1, the elastic sleeve 2, the steel wire rope 3, the lock catch 4, the ratchet wheel 24 and the pawl 25 in the invention are the same as those of the shell 1, the elastic sleeve 2, the steel wire rope 3 lock catch 4, the ratchet wheel 24 and the pawl 25 in the existing safety catcher, and the invention adopts the technology.

When the winding wheel 5 rotates to drive the ratchet wheel 24 to rotate, the ratchet wheel 24 can stir one end of the pawl 25, so that the pawl 25 swings, when the rotating speed of the winding wheel 5 is large, namely the rotating speed of the ratchet wheel 24 is relatively large, the pawl 25 is stirred by the ratchet wheel 24, the swinging amplitude is relatively increased, the other end of the pawl 25 is matched with the ratchet wheel 24, the ratchet wheel 24 stirs the other end of the pawl 25 through teeth on the ratchet wheel 24, and the locking of the pawl 25 and the ratchet wheel 24 is completed.

The plate spring 27 has the function of providing pre-pressure for the pawl 25, so that one end of the pawl 25 is in a matched state with the ratchet wheel 24 in an initial state, the limiting fixture block 26 designed by the invention has the function of limiting the pawl 25 in the initial state, and the phenomenon that in the initial state, the contact and matching area of the pawl 25 and the ratchet wheel 24 is too large under the action of the plate spring 27, the ratchet wheel 24 cannot be smoothly separated from the pawl 25 in the rotating process, and the movement interference occurs.

As shown in fig. 4 and 5, the winding wheel 5 has the same structure on both sides, and for either side, as shown in fig. 5 and 10, the cam 12 is rotatably mounted on the second rotating shaft 23; the pawl 25 is arranged on the cam 12 in a swinging mode, and a limiting clamping block 26 corresponding to the pawl 25 is fixedly arranged on the cam 12; one end of a plate spring 27 corresponding to the pawl 25 is fixedly installed on the pawl 25, and the other end is fixedly installed on the cam 12; as shown in fig. 11 and 12, the limiting mechanism 8 is installed in the housing 1, the limiting mechanism 8 includes a limiting arc block 30, the limiting arc block 30 is slidably installed in the housing 1, and a fourth return spring 32 is installed between the limiting arc block 30 and the housing 1; the limiting arc block 30 has a limiting effect on the rotation of the cam 12; as shown in fig. 13, the outer circumferential surface 28 of the trigger plate 7 has a concave surface 37 area, and as shown in fig. 7, the trigger plate 7 is fixedly installed on one side of the cam 12; a return spring is arranged between the trigger plate 7 and the shell 1; as shown in fig. 8 and 13, a cylinder 22 is arranged on the sliding sleeve 19, and the cylinder 22 is matched with the trigger disk 7; the clamping mechanism is arranged in the shell 1; as shown in fig. 8, the locking mechanism 9 is composed of a sliding sleeve 19, a limiting block 21 and a locking rod 43, the sliding sleeve 19 is slidably mounted in the housing 1, and a first return spring 18 is mounted between the sliding sleeve 19 and the housing 1; one end of the limiting block 21 is slidably mounted in the sliding sleeve 19, and a second return spring 20 is mounted between one end of the limiting block 21 located in the sliding sleeve 19 and the sliding sleeve 19; the limiting block 21 is provided with a clamping groove 42; the clamping rod 43 is slidably mounted on the shell 1, and a third return spring 46 is mounted between the clamping rod 43 and the shell 1; the clamping rod 43 is matched with the clamping groove 42 on the limiting block 21; as shown in fig. 9, the limiting wheel 6 is provided with a limiting protrusion 13, the limiting wheel 6 is fixedly mounted on the second rotating shaft 23, and as shown in fig. 9, the limiting protrusion 13 on the limiting wheel 6 is matched with the limiting block 21; a first scroll spring 10 is installed between the limiting wheel 6 and the housing 1.

When the limiting block 21 is only stressed by the second return spring 20, and the limiting block 21 extends out of the sliding sleeve 19 to the longest position, the clamping groove 42 of the limiting block 21 just corresponds to the clamping rod 43, and when the clamping rod 43 is matched with the clamping groove 42 on the limiting block 21, the distance between one end of the limiting block 21, which is far away from the sliding sleeve 19, and the circle center of the limiting wheel 6 is greater than the radius of the limiting wheel 6 and smaller than the distance between the convex point of the limiting protrusion 13 and the circle center of the limiting wheel 6. The purpose of this design is: when the limiting block 21 extends out of the sliding sleeve 19 to the longest extent and the clamping groove 42 of the limiting block 21 just corresponds to the clamping rod 43, the limiting block 21 is not matched with the limiting protrusion 13 to maintain a certain time, the clamping rod 43 has enough time to be inserted into the clamping groove 42 at the time, and the situation that the clamping rod 43 cannot be inserted into the clamping groove 42 at the too high rotating speed of the limiting wheel 6 is prevented.

The anti-falling device designed by the invention is mainly locked and bears the locking force through the limiting of the limiting block 21 and the limiting wheel 6, the designed limiting block 21 and the limiting wheel 6 have larger structure volume and can ensure enough strength to lock, and the aim of standby locking is achieved only after the limiting block 21 and the limiting wheel 6 are failed through the matching of the limiting arc block 30 and the cam 12, and when the anti-falling device is locked through the standby structure, the anti-falling device needs to be replaced or the structures of the limiting block 21 and the limiting wheel 6 need to be maintained.

The reason that the limiting block 21 can slide in the sliding sleeve 19 is designed in the invention, and the reason that the limiting block 21 can push the limiting block 21 to move towards the inner side of the sliding sleeve 19 after the limiting bulge 13 on the limiting wheel 6 is contacted with the limiting block 21 in the resetting process is ensured, so that the limiting bulge 13 on the limiting wheel 6 passes over the limiting block 21; when the reset mechanism is reset, the clamping rod 43 needs to be manually pulled up, so that the clamping rod 43 is separated from the clamping groove 42 on the limiting block 21 and contacts with the limiting block 21 to limit the limiting block 21; the limiting block 21 and the sliding sleeve 19 are reset under the action of the cylinder 22 and the trigger disk 7.

As shown in fig. 9, the retainer ring 14 is mounted on the retainer wheel 6, and as shown in fig. 5 and 7, the inner end of the first scroll spring 10 is fixedly mounted on the housing 1, and the outer end of the scroll spring is fixedly mounted on the inner circumferential surface 28 of the retainer ring 14. The first scroll spring 10 is used for restoring the limiting wheel 6 and the winding wheel 5.

As shown in fig. 13, a circular arc chamfer is formed between the concave surface 37 formed on the trigger plate 7 and the outer circumferential surface 28 of the trigger plate 7; ensuring a smooth transition of the cylindrical body 22 to the concave surface 37.

As shown in fig. 5 and 8, two guide sleeves 17 are fixedly installed in the housing 1, and two guide rods 16 are respectively slidably installed in the two guide sleeves 17; the two sliding sleeves 19 are fixedly installed at one end of the two guide rods 16, one end of each of the two first return springs 18 is fixedly installed on the two guide rods 16, and the other end of each of the two first return springs 18 is fixedly installed on the inner end face of each of the two guide sleeves 17.

As shown in fig. 8, two mounting sleeves 44 are fixedly mounted on the housing 1, two mounting plates 45 are fixedly mounted on the two clamping rods 43, one end of each of the two third return springs 46 is fixedly mounted on the two mounting plates 45, and the other end of each of the two third return springs 46 is fixedly mounted on the inner end surface of the two mounting sleeves 44.

As shown in fig. 12, the limiting mechanism 8 further includes a guide sliding rod 31, a fixing block 33, and a limiting plate 34, wherein the fixing block 33 is fixedly installed on the housing 1, one end of the guide sliding rod 31 is fixedly installed on the fixing block 33, the other end of the guide sliding rod 31 is fixedly installed with the limiting plate 34, the limiting arc block 30 is slidably installed on the guide sliding rod 31, one end of a fourth return spring 32 is fixedly installed on the limiting arc block 30, and the other end of the fourth return spring 32 is fixedly installed on the fixing block 33; the limiting plate 34 is used for limiting the limiting arc block 30 mounted on the guide slide rod 31 and preventing the limiting arc block 30 from separating from the guide slide rod 31.

As shown in fig. 5, two mounting rings 41 are symmetrically installed in the housing 1, and as shown in fig. 11, the inner ends of the two second spiral springs 11 are respectively and fixedly installed on the two trigger disks 7, and the outer ends of the two second spiral springs 11 are respectively and fixedly installed on the inner circular surfaces 28 of the two mounting rings 41. The second spiral spring 11 acts to reset the cam 12, ratchet 24 and trigger plate 7.

As shown in fig. 12, the cam 12 is composed of a circular surface 28 and a convex surface 29, and the cam 12 is engaged with the limit arc 30 through the circular surface 28 and the convex surface 29.

As shown in fig. 7, the two sliding sleeves 19 are respectively and symmetrically provided with two guide rails 15 for guiding the sliding sleeves; because of stopper 21 is spacing with spacing wheel 6 cooperation to winding wheel 5, in order to improve the spacing intensity of stopper 21, so designed guide rail 15, increased stopper 21's bearing capacity.

The two pawls 25 are rotatably mounted on the corresponding cams 12 by a third rotating shaft 35, respectively.

The first return spring 18 is an extension spring and has a pretension force; the second return spring 20 is a compression spring and has a pre-pressure; the third return spring 46 is a compression spring and has a pre-pressure; the fourth return spring 32 is a compression spring. The spring rate of the first return spring 18 is greater than that of the second return spring 20, and the first return spring 18 ensures that the cylinder 22 is constantly in contact with the outer circumferential surface 28 of the trigger plate. According to the invention, when the cam 12 rotationally extrudes the limit arc block 30, so that the limit arc block 30 slides along the guide slide rod 31, the fourth return spring 32 is compressed, a buffer effect can be achieved through the fourth spring, and when the fourth return spring 32 is pressed to be incompressible, the limit arc block 30 limits the cam 12; reducing the impact force when the ratchet wheel 24 and the pawl 25 bear the locking force.

According to the invention, the limiting mechanisms 8, the clamping mechanisms 9, the ratchet wheels 24, the pawls 25, the cams 12, the trigger disc 7 and the limiting wheels 6 are arranged on the two sides of the winding wheel 5 to improve the stability of the falling protector, and the falling protector can be locked no matter which side structure acts; the safety is better.

According to the anti-falling device designed by the invention, when the steel wire rope 3 is pulled out, the winding wheel 5 rotates, the winding wheel 5 drives the ratchet wheel 24 to rotate, and under the condition of higher speed, the ratchet wheel 24 and the pawl 25 are triggered, and after the ratchet wheel 24 and the pawl 25 are triggered, the steel wire rope 3 can be pulled out by a certain length, so that compared with the traditional anti-falling device, a worker can pull the steel wire rope 3 quickly within a certain degree, and the anti-falling device is convenient for the worker to operate quickly.

The invention has the following angle settings:

(1) the regional angle of 7 concave surfaces 37 of trigger dish is for being greater than 90 degrees, the purpose of design like this, after stopper 21 stretches out under first reset spring 18 effect, under spacing protruding 13's effect, kelly 43 does not cooperate with draw-in groove 42, along with spacing wheel 6's rotation, the stopper is through this spacing protruding 13 back, spacing next spacing protruding 13 carries out, this in-process spacing wheel 6 need rotate about 90 degrees, this in-process stopper 21 requirement has spacing protruding 13's ability all the time, so the regional angle of concave surface 37 is greater than 90 degrees.

(2) In the initial state, in the rotating direction of the trigger disc 7 when the steel wire rope 3 is pulled out, the included angle between the end, firstly matched with the limiting block 21, of the concave surface 37 of the trigger disc 7 and the limiting block 21 is 150 degrees, so that the winding wheel 5 can rotate 150 degrees after the ratchet wheel 24 and the pawl 25 are triggered, and the user can move quickly without locking the distance.

(3) In the initial state, the angle formed by the convex surface 29 of the cam 12 and the limiting arc block 30 in the rotation direction of the cam 12 when the wire rope 3 is pulled out is 250-260 degrees, which is greater than 150 degrees plus 90 degrees, so as to ensure the locking angle of the limiting block 21 to the limiting wheel 6.

The specific working process is as follows: when the anti-falling device designed by the invention is used, in the normal use process, when a user slowly pulls out the steel wire rope 3, the steel wire rope 3 drives the winding wheel 5 to rotate, the winding wheel 5 rotates to drive the ratchet wheel 24 to rotate, the ratchet wheel 24 rotates to stir one end of the pawl 25 matched with the ratchet wheel through the teeth on the ratchet wheel 24, and meanwhile, the first volute spring 10 is compressed; therefore, after the falling protector is used, the steel wire rope 3 is consistently in a tight state in the moving process of a worker; because the winding wheel 5 rotates at a relatively slow speed, the amplitude of the oscillation of the pawl 25 is not sufficient to cause the ratchet wheel 24 to be locked with the pawl 25; the user can move normally.

When a person falls off in the using process, the pawl 25 is shifted by the ratchet wheel 24, the swing amplitude is relatively increased, so that the other end of the pawl 25 is matched with the ratchet wheel 24, the ratchet wheel 24 shifts the other end of the pawl 25 through teeth on the ratchet wheel 24, and the locking of the pawl 25 and the ratchet wheel 24 is completed; at the moment, the winding wheel 5 rotates to drive the cam 12 to rotate through the ratchet wheel 24, the pawl 25 and the third rotating shaft 35, the cam 12 rotates to drive the trigger plate 7 to rotate on one side, the cylinder 22 matched with the trigger plate 7 is matched with the concave surface 37 on the trigger plate 7 after rotating for 150 degrees in the rotating process of the trigger plate 7, and at the moment, under the pretension force of the first return spring 18, the guide rod 16 drives the sliding sleeve 19 to slide to one side close to the limiting wheel 6; the limiting block 21 is driven to move towards one side of the limiting wheel 6 by sliding movement, the limiting block 21 is just matched with the limiting protrusion 13 in the moving process of the limiting block 21, the clamping groove 42 on the limiting block 21 cannot correspond to the clamping rod 43, when the limiting protrusion 13 is separated from the limiting block 21 along with the limiting wheel 6, the limiting block 21 is pressed into the sliding sleeve 19, the second return spring 20 is compressed, and the cylinder 22 is always contacted with the trigger plate because the elastic coefficient of the second return spring 20 is smaller than that of the first return spring 18, so that the collision between the cylinder 22 and the trigger plate is avoided; when the limiting protrusion 13 is separated from the limiting block 21 along with the limiting wheel 6, the limiting block 21 extends out under the action of the second return spring 20, and the clamping groove 42 of the limiting block 21 corresponds to the clamping rod 43; because a certain gap is formed between the protrusions on the limiting wheel 6, when the clamping groove 42 on the limiting block 21 is matched with the corresponding clamping rod 43, the clamping rod 43 has enough time to insert one end of the clamping rod into the clamping groove 42 under the action of the third return spring 46 to limit the limiting block 21, and when the next limiting protrusion 13 is matched with the limiting block 21, the limiting block 21 is limited by the clamping rod 43, so that the limiting wheel 6 is limited; in addition, in the moving process of the limiting block 21, when the limiting block 21 is not matched with the limiting protrusion 13, the limiting block 21 directly extends out and is limited by the clamping rod 43; when the limiting protrusion 13 is matched with the limiting block 21 along with the rotation of the limiting wheel 6, the limiting block 21 is limited by the clamping rod 43, so that the limiting wheel 6 is limited; when the cam 12 rotates, if the anti-falling device cannot be locked due to errors such as abrasion or structural damage of the limiting wheel 6 and the limiting block 21, the convex surface 29 on the cam 12 in the rotating process can extrude the limiting arc block 30 after contacting with the limiting arc block 30, so that the limiting arc block 30 slides along the guide slide rod 31, when the limiting arc block 30 slides to the limit state and stops sliding, the cam 12 stops rotating, at the moment, the pawl 25 arranged on the cam 12 also stops rotating, and at the moment, the anti-falling device is locked by being transmitted to the ratchet wheel 24 and the pawl 25 through the matching of the cam 12 and the limiting arc block 30; in this case, however, the locking of the safety brake device is the same as that of a conventional safety brake device, and is locked by the cooperation of the ratchet 24 and the pawl 25.

Claims

1. A high-reliability falling protector comprises a shell, an elastic sleeve, a steel wire rope, a lock catch, a winding wheel, a ratchet wheel and a pawl, wherein the elastic sleeve is arranged on one side of the shell; the winding wheel is rotatably arranged in the shell through a second rotating shaft, a steel wire rope is wound on the winding wheel, one end of the steel wire rope penetrates out of the shell, and a lock catch is fixedly arranged on the outer side of the shell through an elastic sleeve; the ratchet wheel is fixedly arranged on the winding wheel, the pawl is arranged in the shell in a swinging mode, and the pawl is matched with the ratchet wheel; a plate spring for resetting the pawl and a limiting fixture block for limiting the pawl are arranged in the shell; the method is characterized in that: the number of the ratchet wheels arranged on the winding wheel is two, and the two ratchet wheels are symmetrically arranged on two sides of the winding wheel;

2. A highly reliable fall arrester as claimed in claim 1, wherein: the limiting wheel is provided with a fixing ring, the inner end of the first scroll spring is fixedly arranged on the shell, and the outer end of the scroll spring is fixedly arranged on the inner circular surface of the fixing ring.

3. A highly reliable fall arrester as claimed in claim 1, wherein: the arc chamfer angle is arranged between the concave surface formed on the trigger disc and the outer circular surface of the trigger disc, the angle of the concave surface area of the trigger disc is larger than 90 degrees, and in the initial state, the included angle between the concave surface of the trigger disc and the limiting block and the included angle between the limiting block and one end of the trigger disc, which is firstly matched with the limiting block, are 150 degrees in the rotating direction of the trigger disc when the steel wire rope is pulled out.

4. A highly reliable fall arrester as claimed in claim 1, wherein: two guide sleeves are fixedly arranged in the shell, and two guide rods are respectively arranged in the two guide sleeves in a sliding manner; the two sliding sleeves are fixedly arranged at one ends of the two guide rods, one ends of the two first reset springs are respectively and fixedly arranged on the two guide rods, and the other ends of the two first reset springs are respectively and fixedly arranged on the inner end surfaces of the two guide sleeves;

5. A highly reliable fall arrester as claimed in claim 1, wherein: the limiting mechanism further comprises a guide sliding rod, a fixing block and a limiting plate, wherein the fixing block is fixedly mounted on the shell, one end of the guide sliding rod is fixedly mounted on the fixing block, the limiting plate is fixedly mounted at the other end of the guide sliding rod, a limiting arc block is slidably mounted on the guide sliding rod, one end of a fourth reset spring is fixedly mounted on the limiting arc block, and the other end of the fourth reset spring is fixedly mounted on the fixing block.

6. A highly reliable fall arrester as claimed in claim 1, wherein: two mounting rings are symmetrically mounted in the shell, the inner ends of the two second volute spiral springs are fixedly mounted on the two trigger disks respectively, and the outer ends of the two second volute spiral springs are fixedly mounted on the inner circular surfaces of the two mounting rings respectively.

7. A highly reliable fall arrester as claimed in claim 1, wherein: the cam consists of a circular surface and a convex surface, and is matched with the limiting arc block through the circular surface and the convex surface; in the initial state, the angle between the convex surface of the cam and the limiting arc block in the rotation direction of the cam when the steel wire rope is pulled out is 250-260 degrees.

8. A highly reliable fall arrester as claimed in claim 1, wherein: the two sliding sleeves are respectively and symmetrically provided with two guide rails which play a role in guiding the sliding sleeves.

9. A highly reliable fall arrester as claimed in claim 1, wherein: the two pawls are rotatably mounted on the corresponding cams through a third rotating shaft, respectively.

10. A highly reliable fall arrester as claimed in claim 1, wherein: the first return spring is an extension spring and has pretension; the second return spring is a compression spring and has pre-pressure; the third return spring is a compression spring and has pre-pressure; the fourth return spring is a compression spring.