Mechanical safety brake for winding drum

Abstract

The utility model provides a mechanical safety brake for a winding drum, belongs to the technical field of winding drum machinery, and solves the technical problems that the existing mechanical safety brake cannot brake quickly, is unstable in effect and the like. A canvas belt wraps a winding drum, a guide wheel and a ratchet wheel assembly are arranged on the canvas belt, the guide wheel is detachably connected with the ratchet wheel assembly, the guide wheel is located at the side end of the ratchet wheel assembly, a pawl assembly is arranged on a winding drum support and makes contact with the guide wheel, and a plurality of circumferentially-distributed check block assemblies are arranged in the ratchet wheel assembly. The magnet block is matched with the second electric push rod, the check block assembly and the ratchet wheel assembly, the check block assembly can stretch out and retract, the distance sensor is matched with the guide wheel, the idler wheel, the pawl and the first electric push rod, the pawl is matched with the check block assembly and the ratchet wheel assembly, the braking efficiency is high, the effect is stable, and the whole check block is convenient to install and replace; the canvas belt is matched with the guide wheel, the winding drum and the ratchet wheel assembly, friction force is increased, and sliding is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of reel machinery and relates to a safety gate, in particular to a mechanical safety gate for a reel. Background Art

[0002] The reel is widely used in various industries such as manufacturing, mining, transportation, and construction. It is mainly used for lifting and transporting heavy objects. When the brake fails due to reasons such as broken teeth and broken shafts of the reel's reducer, the reel accelerates and falls under the action of the heavy object, causing an accident. In order to improve the safety of the reel when in use, it is very necessary to provide a reel safety brake with reliable performance.

[0003] After searching, it is found that a safety brake for electric hoist is disclosed in Chinese patent documents [Application No.: 201520327018.2; Publication No.: CN204752079U]. This safety brake for electric hoist includes a drum, a ratchet and a guide rail are arranged on the outside of the drum, a screw A is arranged inside the ratchet, a friction plate is arranged inside the ratchet, a screw B is arranged on the guide rail, a roller is arranged on the right side of the guide rail, a tension spring is arranged on the roller, a pawl is arranged below the roller, a drum housing is arranged on the side of the pawl, the pawl is fixed on the pin B, a bracket is arranged on the lower side of the pin B, a switch is arranged on the side of the pin B, and a pin A is arranged on the upper side of the pawl.

[0004] Although the safety brake disclosed in the patent has a simple structure and can brake the reel, the braking effect of the brake is unstable and the braking speed is not fast.

[0005] Therefore, we propose a mechanical safety brake for a reel, which can brake the reel quickly and has a stable braking effect. Summary of the invention

[0006] The purpose of the utility model is to solve the above problems in the prior art and to propose a mechanical safety brake for a reel. The technical problem to be solved by the utility model is: how to achieve rapid braking of the reel by the safety brake with stable braking effect.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] A mechanical safety gate for a reel comprises a guide wheel, a canvas belt, a pawl assembly, a reel and a ratchet assembly, wherein the canvas belt is wrapped around the reel, the guide wheel and the ratchet assembly are arranged on the canvas belt, the guide wheel and the ratchet assembly are detachably connected, the guide wheel is located at the side end of the ratchet assembly, the pawl assembly is arranged on the reel bracket, the pawl assembly is in contact with the guide wheel, a distance sensor, an electric push rod 1 and an electric push rod 2 are arranged on the pawl assembly, and a plurality of circumferentially distributed block assemblies are arranged in the ratchet assembly.

[0009] The working principle of the utility model is that when the reel is operating normally, the reel drives the guide wheel and the ratchet assembly to rotate, the canvas belt provides friction to ensure that the guide wheel and the ratchet assembly do not slide, one end of the pawl assembly rolls on the guide wheel, and the other end of the pawl assembly maintains a certain distance from the ratchet assembly;

[0010] When the reducer breaks teeth or shaft during the lifting of people or objects, the reel accelerates under the action of the weight, driving the guide wheel and ratchet assembly to accelerate. At this time, the guide wheel pops open one end of the pawl assembly, and the other end of the pawl assembly contacts the ratchet assembly, causing the ratchet assembly to stop rotating and play a protective role.

[0011] When the guide wheel pops open one end of the pawl assembly, the distance sensor works, and the electric push rod 1 pushes the other end of the pawl assembly upward, making it contact the ratchet assembly more quickly. When the reel accelerates under the action of the heavy object, the block assembly extends from the ratchet assembly, making the other end of the pawl assembly contact the ratchet assembly more quickly. After the reducer is broken, the electric push rod 2 pushes the block assembly to reset.

[0012] The guide wheel is provided with a plurality of fixing screw holes perpendicular to the axis of the guide wheel, in which fixing screws are threaded, and the fixing screws are in contact with the canvas belt, and the guide wheel is provided with a plurality of countersunk holes parallel to the axis of the guide wheel, and the guide wheel is threadedly connected to the ratchet assembly through the countersunk holes.

[0013] With the above structure, the guide wheel is fixed to the canvas belt by a set screw to ensure that the guide wheel does not slide. The guide wheel is screwed to the ratchet assembly to ensure that the relative position is fixed and provide a rolling track for the ratchet assembly.

[0014] The inner and outer sides of the canvas belt are alternately provided with circumferentially distributed friction plates. The canvas belt is made of highly wear-resistant polyester canvas material, and the friction plates are made of polyurethane rubber material.

[0015] With the above structure, the friction of the canvas belt is increased by the friction plate to prevent the canvas belt from sliding on the reel, while also limiting the sliding of the ratchet assembly.

[0016] The ratchet assembly comprises an arc-shaped assembled ratchet wheel 1, an arc-shaped assembled ratchet wheel 2 and a fixing screw. The arc-shaped assembled ratchet wheel 1 and the arc-shaped assembled ratchet wheel 2 have the same structure and are connected end to end. The arc-shaped assembled ratchet wheel 1 and the arc-shaped assembled ratchet wheel 2 are both provided with a plurality of matching screw holes and ratchet tooth grooves parallel to their axes, and the guide wheel is installed by matching the matching screw holes and the countersunk holes. One end of the arc-shaped assembled ratchet wheel 1 and the arc-shaped assembled ratchet wheel 2 is provided with a fixing through hole, and the other end of the arc-shaped assembled ratchet wheel 1 and the arc-shaped assembled ratchet wheel 2 is provided with a fixing through hole. A fixing screw hole is provided at the end, the fixing through hole is connected with the fixing screw hole at the corresponding position, the fixing through hole and the fixing screw hole are connected by a fixing screw, a block slide groove and a limit groove are provided on the ratchet teeth of the arc-shaped assembled ratchet wheel 1 and the arc-shaped assembled ratchet wheel 2, a baffle is provided at the end of the block slide groove, the baffle is located above the limit groove, and the block slide groove and the limit groove are connected, a magnet block is provided under the block slide groove, and the inner rings of the arc-shaped assembled ratchet wheel 1 and the arc-shaped assembled ratchet wheel 2 are provided with a plurality of rows of evenly distributed friction teeth.

[0017] The above structure is adopted, and the fixed through hole, the fixed screw hole and the fixed screw are used to install the arc-shaped assembled ratchet wheel 1 and the arc-shaped assembled ratchet wheel 2, and the two are made into a circular ratchet. By matching the screw holes and ensuring that the position with the guide wheel is relatively fixed, when the circular ratchet wheel accelerates, the block assembly that moves to the bottom of the circular ratchet wheel overcomes the magnetic attraction of the magnet block, slides in the block slide groove and the limit groove, and finally abuts against the block bar, the pawl assembly abuts against the block assembly, and is embedded in the ratchet tooth groove through the block assembly, so as to achieve the effect of braking the circular ratchet, and the friction teeth abut against the friction plate, thereby increasing the friction force and preventing the circular ratchet wheel from sliding.

[0018] The pawl assembly includes a pawl fixing seat and a pawl, the pawl fixing seat is fixed on the reel support, the pawl is rotatably arranged in the pawl fixing seat, a support rod is provided on the left side of the pawl, a roller is rotatably arranged on the end of the support rod, the roller contacts the guide wheel, a distance sensor is fixed on the left side of the pawl fixing seat, the distance sensor is located at the inner end of the guide wheel, and the probe of the distance sensor is directly opposite to the lowest point of the contact position between the roller and the guide wheel, an electric push rod 1 is fixed on the pawl fixing seat, a top wheel is rotatably arranged at the telescopic end of the electric push rod 1, and the top wheel is located below the pawl, an electric push rod 2 is fixed on the right side of the pawl fixing seat, a guide cylinder is fixed on the telescopic end of the electric push rod 2, and the guide cylinder is abutted against the outermost circle position of the ratchet when raised.

[0019] With the above structure, the pawl fixing seat provides support to keep the position fixed, the support rod is used to install the roller, and is integrated with the pawl. The change of the roller position drives the change of the pawl. When the reel is running normally, the roller rolls on the guide wheel, and the pawl keeps a certain distance from the circular ratchet.

[0020] When the reducer has broken teeth or shaft, the reel accelerates and the roller is ejected. When the distance sensor detects that the roller has left, the electric push rod 1 is immediately started. The top wheel at the telescopic end of the electric push rod 1 pushes the pawl upward, and the pawl contacts the block assembly and is embedded in the ratchet tooth groove, braking the circular ratchet.

[0021] When the reel returns to normal, the electric push rod 2 is started. When the guide cylinder on the electric push rod 2 moves to a position tangent to the ratchet tooth surface of the circular ratchet wheel, the guide cylinder on the electric push rod 2 conflicts with the block assembly and pushes the block assembly back so that it is adsorbed by the magnet block.

[0022] The block assembly includes block one, block two and a connecting screw. Block one is provided with an oblique screw hole, block two is provided with a threaded blind hole, the threaded blind hole is connected to the oblique screw hole, and the connecting screw is screwed into the oblique screw hole and the threaded blind hole, so that block one and block two form a block as a whole. Block one is located above block two, and a limit block is provided on the left side of block two. The block as a whole is slidably arranged inside the block slide groove, and the limit block is slidably arranged in the limit groove, and the uppermost arc surface of the guide cylinder in the initial position is located below the outermost arc surface when block one is extended.

[0023] With the above structure, the connecting screws, threaded blind holes and oblique screw holes are used to assemble the first and second blocks. When the reel is operating normally, the overall gravity of the block moving to the bottom of the circular ratchet is equal to the magnetic attraction of the magnet block;

[0024] When the reducer has broken teeth or broken shafts, when the circular ratchet wheel accelerates, the block moving to the bottom of the circular ratchet wheel overcomes the magnetic attraction of the magnet block as a whole, and extends the ratchet teeth of the circular ratchet wheel. Blocks 1 and 2 slide in the block slide groove, and the limit block slides in the limit groove. After sliding a certain distance, the limit block contacts the stop bar to ensure that the block assembly will not slide out. The block assembly is composed of several parts, which is convenient for installation and replacement.

[0025] When folding, the first stopper abuts against the guide cylinder on the second electric push rod. As the stopper rotates, the first stopper drives the stopper assembly to slide and is adsorbed by the magnet block again.

[0026] Compared with the prior art, the mechanical safety gate for the reel has the following advantages:

[0027] In summary, the coordination of the pawl, the block assembly and the ratchet assembly can ensure high braking efficiency and stable braking effect;

[0028] The distance sensor cooperates with the guide wheel, roller, ratchet and electric push rod to achieve rapid braking and avoid accidents.

[0029] The magnet block cooperates with the electric push rod 2, the block assembly and the ratchet assembly, so that the block assembly can complete the action of extending and retracting, thereby improving the braking efficiency;

[0030] The canvas belt cooperates with the guide wheel, reel and ratchet assembly to increase friction and avoid sliding;

[0031] The stopper one and the stopper two, the connecting screws, the oblique screw holes, the threaded blind holes, the limiting grooves, the stopper slide grooves and the limiting stopper are matched to facilitate the installation and replacement of the stopper as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a front view structural schematic diagram of the utility model.

[0033] Figure 2 It is a side structural schematic diagram of the utility model.

[0034] Figure 3 It is a structural schematic diagram of the ratchet assembly in the utility model.

[0035] Figure 4 It is a schematic cross-sectional view of the utility model in which the stopper assembly is in an extended state.

[0036] Figure 5 It is a structural schematic diagram of the utility model in which the stopper assembly is in a folded state.

[0037] Figure 6 It is a structural schematic diagram of the canvas belt in the utility model.

[0038] In the figure, 1, guide wheel; 2, arc-shaped assembled ratchet wheel 1; 3, canvas belt; 4, pawl assembly; 5, pawl; 6, electric push rod 1; 7, electric push rod 2; 8, arc-shaped assembled ratchet wheel 2; 9, block assembly; 10, reel; 11, tightening screw hole; 12, roller; 13, support rod; 14, pawl fixing seat; 15, countersunk hole; 16, fixed through hole; 17, fixing screw; 18, ratchet tooth groove; 19, matching screw hole; 20, friction tooth; 21, block 1; 22, block 2; 23, block slide groove; 24, magnet block; 25, limit groove; 26, stop bar; 27, limit block; 28, threaded blind hole; 29, connecting screw; 30, oblique screw hole; 31, ratchet assembly; 32, fixing screw hole; 33, tightening screw; 34, friction plate; 35, distance sensor. DETAILED DESCRIPTION

[0039] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0040] like Figure 1-Figure 6As shown, a mechanical safety gate for a reel includes a guide wheel 1, a canvas belt 3, a pawl assembly 4, a reel 10 and a ratchet assembly 31, the canvas belt 3 is wrapped around the reel 10, the guide wheel 1 and the ratchet assembly 31 are arranged on the canvas belt 3, the guide wheel 1 and the ratchet assembly 31 are detachably connected, the guide wheel 1 is located at the side end of the ratchet assembly 31, the pawl assembly 4 is arranged on the reel bracket, the pawl assembly 4 is in contact with the guide wheel 1, the pawl assembly 4 is provided with a distance sensor 35, an electric push rod 1 6 and an electric push rod 2 7, and a plurality of circumferentially distributed block assemblies 9 are provided in the ratchet assembly 31.

[0041] In this embodiment, when the reel 10 operates normally, the reel 10 drives the guide wheel 1 and the ratchet assembly 31 to rotate, and the canvas belt 3 provides friction to ensure that the guide wheel 1 and the ratchet assembly 31 do not slide, and one end of the pawl assembly 4 rolls on the guide wheel 1, and the other end of the pawl assembly 4 maintains a certain distance from the ratchet assembly 31;

[0042] When the reducer has broken teeth or a broken shaft during the lifting of people or objects, the drum 10 accelerates under the action of the weight, and the drum 10 drives the guide wheel 1 and the ratchet assembly 31 to accelerate. At this time, the guide wheel 1 pops open one end of the pawl assembly 4, and the other end of the pawl assembly 4 contacts the ratchet assembly 31, causing the ratchet assembly 31 to stop rotating, thereby playing a protective role.

[0043] When the guide wheel 1 pops open one end of the pawl assembly 4, the distance sensor 35 works, and the electric push rod 1 6 pushes the other end of the pawl assembly 4 upward, so that it hits the ratchet assembly 31 more quickly. When the reel 10 rotates faster under the action of the weight, the block assembly 9 extends from the ratchet assembly 31, so that the other end of the pawl assembly 4 hits the ratchet assembly 31 more quickly. After the reducer breaks the teeth and shaft, the electric push rod 2 7 pushes the block assembly 9 to reset.

[0044] The guide wheel 1 is provided with a plurality of fixing screw holes 11 which are perpendicular to the axis of the guide wheel 1 , and fixing screws 33 are threaded into the fixing screw holes 11 , and the fixing screws 33 abut against the canvas belt 3 , and the guide wheel 1 is provided with a plurality of countersunk holes 15 which are parallel to the axis of the guide wheel 1 , and the guide wheel 1 is threadedly connected to the ratchet assembly 31 through the countersunk holes 15 .

[0045] In this embodiment, the guide wheel 1 is fixed to the canvas belt 3 by a set screw 33 to ensure that the guide wheel 1 does not slide. The guide wheel 1 is screwed to the ratchet assembly 31 to ensure that the relative position is fixed and provide a rolling track for the ratchet assembly 31.

[0046] Friction plates 34 are alternately arranged on the inner and outer sides of the canvas belt 3 in a circumferential distribution. The canvas belt 3 is made of a highly wear-resistant polyester canvas material, and the friction plates 34 are made of a polyurethane rubber material.

[0047] In this embodiment, the canvas belt 3 increases the friction force through the friction plate 34 to prevent the canvas belt 3 from sliding on the reel 10, while also limiting the sliding of the ratchet assembly 31.

[0048] The ratchet assembly 31 includes an arc-shaped assembled ratchet 1 2, an arc-shaped assembled ratchet 2 8 and a fixing screw 17. The arc-shaped assembled ratchet 1 2 and the arc-shaped assembled ratchet 2 8 have the same structure and are connected end to end. The arc-shaped assembled ratchet 1 2 and the arc-shaped assembled ratchet 2 8 are provided with a plurality of matching screw holes 19 and ratchet tooth grooves 18 parallel to their axes, and the guide wheel 1 is installed by matching the matching screw holes 19 with the countersunk holes 15. A fixing through hole 16 is provided at one end of the arc-shaped assembled ratchet 1 2 and the arc-shaped assembled ratchet 2 8, and a fixing screw hole is provided at the other end of the arc-shaped assembled ratchet 1 2 and the arc-shaped assembled ratchet 2 8. 32, the fixing through hole 16 is communicated with the fixing screw hole 32 at the corresponding position, the fixing through hole 16 and the fixing screw hole 32 are connected by a fixing screw 17, a block slide groove 23 and a limiting groove 25 are provided on the ratchet teeth of the arc-shaped assembled ratchet wheel 1 2 and the arc-shaped assembled ratchet wheel 2 8, a blocking bar 26 is provided at the end of the block slide groove 23, the blocking bar 26 is located above the limiting groove 25, and the block slide groove 23 and the limiting groove 25 are communicated, a magnet block 24 is provided below the block slide groove 23, and the inner rings of the arc-shaped assembled ratchet wheel 1 2 and the arc-shaped assembled ratchet wheel 2 8 are provided with a plurality of rows of evenly distributed friction teeth 20.

[0049] In this embodiment, the fixed through hole 16, the fixed screw hole 32 and the fixed screw 17 are used to install the arc-shaped assembled ratchet 1 2 and the arc-shaped assembled ratchet 2 8, and the two form a circular ratchet. By cooperating with the screw hole 19 and ensuring that the position with the guide wheel 1 is relatively fixed, when the circular ratchet accelerates, the block assembly 9 that moves to the bottom of the circular ratchet overcomes the magnetic attraction of the magnet block 24, slides in the block slide groove 23 and the limit groove 25, and finally abuts against the block bar 26. The pawl assembly 4 abuts against the block assembly 9 and is embedded in the ratchet tooth groove 18 through the block assembly 9, thereby achieving the effect of braking the circular ratchet. The friction tooth 20 abuts against the friction plate 34, thereby increasing the friction force and preventing the circular ratchet from sliding.

[0050] The pawl assembly 4 includes a pawl fixing seat 14 and a pawl 5. The pawl fixing seat 14 is fixed on the reel support. The pawl 5 is rotatably set in the pawl fixing seat 14. A support rod 13 is provided on the left side of the pawl 5. A roller 12 is rotatably set on the end of the support rod 13. The roller 12 contacts the guide wheel 1. A distance sensor 35 is fixed on the left side of the pawl fixing seat 14. The distance sensor 35 is located at the inner end of the guide wheel 1, and the probe of the distance sensor 35 is directly opposite to the lowest point of the contact position between the roller 12 and the guide wheel 1. An electric push rod 16 is fixed on the pawl fixing seat 14. The telescopic end of the electric push rod 16 is rotatably provided with a top wheel, and the top wheel is located below the pawl 5. An electric push rod 27 is fixed on the right side of the pawl fixing seat 14. A guide cylinder is fixed on the telescopic end of the electric push rod 27. The arc surface of the guide cylinder when in the raised position contacts the ratchet.

[0051] In this embodiment, the pawl fixing seat 14 provides support and keeps the position fixed. The support rod 13 is used to install the roller 12 and is integrated with the pawl 5. The position change of the roller 12 drives the pawl 5 to change. When the reel 10 operates normally, the roller 12 rolls on the guide wheel 1, and the pawl 5 maintains a certain distance from the circular ratchet.

[0052] When the reducer has broken teeth or broken shaft, the reel 10 accelerates and the roller 12 is ejected. When the distance sensor 35 detects that the roller 12 has left, the electric push rod 6 is immediately started. The top wheel at the telescopic end of the electric push rod 6 pushes the pawl 5 upward, and the pawl 5 contacts the block assembly 9 and is embedded in the ratchet tooth groove 18, braking the circular ratchet.

[0053] When the reel 10 returns to normal, the electric push rod 2 7 is started. When the guide cylinder on the electric push rod 2 7 moves to a position tangent to the ratchet tooth surface of the circular ratchet wheel, the guide cylinder on the electric push rod 2 7 contacts the block assembly 9 and pushes the block assembly 9 back so that it is adsorbed by the magnet block 24.

[0054] The block assembly 9 includes a block 1 21, a block 22 and a connecting screw 29. The block 1 21 is provided with an oblique screw hole 30, and the block 22 is provided with a threaded blind hole 28. The threaded blind hole 28 is connected to the oblique screw hole 30. The connecting screw 29 is screwed into the oblique screw hole 30 and the threaded blind hole 28, so that the block 1 21 and the block 2 22 form a block as a whole. The block 1 21 is located above the block 22, and a limit block 27 is provided on the left side of the block 22. The block as a whole is slidably arranged inside the block slide groove 23, and the limit block 27 is slidably arranged in the limit groove 25. The uppermost arc surface of the guide cylinder in the initial position is located below the outermost arc surface when the block 1 21 is extended.

[0055] In this embodiment, the connecting screw 29, the threaded blind hole 28 and the oblique screw hole 30 are used to assemble the stopper 21 and the stopper 22. When the reel 10 operates normally, the gravity of the entire stopper moving to the bottom of the circular ratchet is equal to the magnetic attraction of the magnet block 24.

[0056] When the reducer has broken teeth or broken shafts, when the circular ratchet wheel accelerates, the block moving to the bottom of the circular ratchet wheel overcomes the magnetic attraction of the magnet block 24 as a whole, and the ratchet teeth of the circular ratchet wheel are extended, and the block 1 21 and the block 2 22 slide in the block slide groove 23, and the limit block 27 slides in the limit groove 25. After the limit block 27 slides a certain distance, it contacts the stop bar 26 to ensure that the block assembly 9 will not slide out. The block assembly 9 is composed of several parts, which is convenient for installation and replacement.

[0057] When folded, the stopper 21 contacts the guide cylinder on the electric push rod 2 7 . As the stopper 21 rotates, the stopper assembly 9 slides and is attracted by the magnet block 24 again.

[0058] The working principle of the utility model is as follows: when the reel 10 is operating normally, the pawl fixing seat 14 provides support to keep the position fixed, the support rod 13 is used to install the roller 12, and is integrated with the pawl 5, the fixing through hole 16, the fixing screw hole 32 and the fixing screw 17 are used to install the arc-shaped assembled ratchet wheel 1 2 and the arc-shaped assembled ratchet wheel 2 8, and the two form a circular ratchet, by matching the screw hole 19 and ensuring that the position is relatively fixed with the guide wheel 1, the connecting screw 29, the threaded blind hole 28 and the oblique screw hole 30 are used to assemble the block 1 21 and the block 2 22, and the guide wheel 1 is tightened by the set screw 33 Fixed on the canvas belt 3, the reel 10 rotates to drive the guide wheel 1 and the ratchet assembly 31 to rotate, and the canvas belt 3 increases the friction force through the friction plate 34 to prevent the canvas belt 3 from sliding on the reel 10, while ensuring that the guide wheel 1 and the ratchet assembly 31 will not slide. The guide wheel 1 is screwed with the ratchet assembly 31 to ensure that the relative position is fixed and provide a rolling track for the roller 12. The roller 12 rolls on the guide wheel 1, and the pawl 5 keeps a certain distance from the circular ratchet. The overall gravity of the block moving to the bottom of the circular ratchet is equal to the magnetic attraction of the magnet block 24, and the block is adsorbed as a whole and will not slide out;

[0059] When the reducer has broken teeth or shaft, the reel 10 accelerates under the action of the weight, and the reel 10 drives the guide wheel 1 and the ratchet assembly 31 to accelerate. At this time, the guide wheel 1 bounces off the roller 12, and the position change of the roller 12 drives the pawl 5 to change. The pawl 5 approaches the circular ratchet. When the distance sensor 35 detects that the roller 12 leaves, the electric push rod 6 is immediately started, and the block at the bottom of the circular ratchet overcomes the magnetic attraction of the magnet block 24 as a whole, and the ratchet teeth of the circular ratchet are extended. The block 21 The stopper 22 slides in the stopper slot 23, the limit stopper 27 slides in the limit slot 25, and the limit stopper 27 slides a certain distance and contacts the stopper bar 26 to ensure that the stopper assembly 9 will not slide out. The stopper assembly 9 is composed of several parts, which is convenient for installation and replacement. The top wheel of the telescopic end of the electric push rod 16 contacts the pawl 5, pushing the pawl 5 to contact the stopper assembly 9, and the stopper assembly 9 is embedded in the ratchet tooth groove 18, so that the circular ratchet stops rotating, which plays a protective role.

[0060] When the reel 10 returns to normal, the electric push rod 1 6 returns to its original position, the pawl 5 leaves the ratchet tooth groove 18, the roller 12 re-fits on the guide wheel 1 and rolls, the electric push rod 2 7 is started, and when the guide cylinder on the electric push rod 2 7 moves to a position tangent to the surface of the circular ratchet teeth, the guide cylinder on the electric push rod 2 7 contacts the block assembly 9 and pushes the block assembly 9 back so that it is adsorbed by the magnet block 24.

[0061] In summary, the pawl 5 cooperates with the block assembly 9 and the ratchet assembly 31 to ensure high braking efficiency and stable braking effect;

[0062] The distance sensor 35 cooperates with the guide wheel 1, the roller 12, the ratchet 5 and the electric push rod 7 to achieve rapid braking and avoid accidents.

[0063] The magnet block 24 cooperates with the electric push rod 27, the block assembly 9 and the ratchet assembly 31, so that the block assembly 9 can complete the action of extending and retracting, thereby improving the braking efficiency;

[0064] The canvas belt 3 cooperates with the guide wheel 1, the reel 10 and the ratchet assembly 31 to increase the friction force and avoid sliding;

[0065] The stopper 1 21 cooperates with the stopper 2 22 , the connecting screw 29 , the oblique screw hole 30 , the threaded blind hole 28 , the limiting groove 25 , the stopper slide groove 23 and the limiting stopper 27 , so that the stopper can be conveniently installed and replaced as a whole.

[0066] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A mechanical safety brake for a reel, comprising a guide wheel (1), a canvas belt (3), a ratchet assembly (4), a reel (10) and a ratchet assembly (31), characterized in that: The canvas belt (3) is wrapped around the reel (10), the guide wheel (1) and the ratchet assembly (31) are arranged on the canvas belt (3), the guide wheel (1) and the ratchet assembly (31) are detachably connected, the guide wheel (1) is located at the side end of the ratchet assembly (31), the pawl assembly (4) is arranged on the reel bracket, the pawl assembly (4) is in contact with the guide wheel (1), the pawl assembly (4) is provided with a distance sensor (35), an electric push rod 1 (6) and an electric push rod 2 (7), and a plurality of circumferentially distributed block assemblies (9) are provided in the ratchet assembly (31).

2. A mechanical safety gate for a reel according to claim 1, characterized in that: The guide wheel (1) is provided with a plurality of fixing screw holes (11) perpendicular to the axis of the guide wheel (1), a fixing screw (33) is screwed into the fixing screw hole (11), and the fixing screw (33) contacts the canvas belt (3), and the guide wheel (1) is provided with a plurality of countersunk holes (15) parallel to the axis of the guide wheel (1), and the guide wheel (1) is screwed to the ratchet assembly (31) through the countersunk holes (15).

3. A mechanical safety gate for a reel according to claim 2, characterized in that: The canvas belt (3) is staggeredly provided with circumferentially distributed friction plates (34) on both inner and outer sides. The canvas belt (3) is made of highly wear-resistant polyester canvas material, and the friction plates (34) are made of polyurethane rubber material.

4. A mechanical safety gate for a reel according to claim 3, characterized in that: The ratchet assembly (31) comprises an arc-shaped assembled ratchet wheel (2), an arc-shaped assembled ratchet wheel (8) and a fixing screw (17). The arc-shaped assembled ratchet wheel (2) and the arc-shaped assembled ratchet wheel (8) have the same structure and are connected end to end. The arc-shaped assembled ratchet wheel (2) and the arc-shaped assembled ratchet wheel (8) are both provided with a plurality of matching screw holes (19) and ratchet tooth grooves (18) parallel to their axes, and the guide wheel (1) is mounted through the matching screw holes (19) and the countersunk holes (15). One end of the arc-shaped assembled ratchet wheel (2) and the arc-shaped assembled ratchet wheel (8) is provided with a fixing through hole (16), and the other end of the arc-shaped assembled ratchet wheel (2) and the arc-shaped assembled ratchet wheel (8) is provided with a fixing screw hole (3 2), the fixing through hole (16) is connected with the fixing screw hole (32) at the corresponding position, the fixing through hole (16) and the fixing screw hole (32) are connected by a fixing screw (17), a block slide groove (23) and a limit groove (25) are provided on the ratchet teeth of the arc-shaped assembled ratchet wheel (2) and the arc-shaped assembled ratchet wheel (8), a stopper slide groove (23) and a stopper groove (25) are provided at the end of the block slide groove (23), the stopper groove (26) is located above the limit groove (25), and the block slide groove (23) and the limit groove (25) are connected, a magnet block (24) is provided below the block slide groove (23), and the inner rings of the arc-shaped assembled ratchet wheel (2) and the arc-shaped assembled ratchet wheel (8) are both provided with a plurality of rows of evenly distributed friction teeth (20).

5. A mechanical safety gate for a reel according to claim 4, characterized in that: The pawl assembly (4) comprises a pawl fixing seat (14) and a pawl (5), the pawl fixing seat (14) being fixed on the reel support, the pawl (5) being rotatably arranged in the pawl fixing seat (14), a support rod (13) being provided on the left side of the pawl (5), a roller (12) being rotatably arranged on the end of the support rod (13), the roller (12) being in contact with the guide wheel (1), a distance sensor (35) being fixedly arranged on the left side of the pawl fixing seat (14), and the distance sensor (35) being located on the guide wheel (1 ), and the probe of the distance sensor (35) is directly opposite to the lowest point of the contact position between the roller (12) and the guide wheel (1), the electric push rod (6) is fixedly arranged on the ratchet fixing seat (14), the telescopic end of the electric push rod (6) is rotatably provided with a top wheel, and the top wheel is located below the ratchet (5), the electric push rod (7) is fixedly arranged on the right side of the ratchet fixing seat (14), the telescopic end of the electric push rod (7) is fixedly provided with a guide cylinder, and the guide cylinder abuts against the outermost circle position of the ratchet when it is raised.

6. A mechanical safety gate for a reel according to claim 5, characterized in that: The stopper assembly (9) comprises a stopper 1 (21), a stopper 2 (22) and a connecting screw (29). The stopper 1 (21) is provided with an oblique screw hole (30), the stopper 2 (22) is provided with a threaded blind hole (28), the threaded blind hole (28) is communicated with the oblique screw hole (30), the connecting screw (29) is screwed into the oblique screw hole (30) and the threaded blind hole (28), so that the stopper 1 (21) and the stopper 2 (22) form a stopper as a whole. The stopper 1 (21) is located above the stopper 2 (22), a limit stopper (27) is provided on the left side of the stopper 2 (22), the stopper as a whole is slidably arranged inside the stopper slide groove (23), the limit stopper (27) is slidably arranged in the limit groove (25), and the uppermost arc surface of the guide cylinder in the initial position is located below the outermost arc surface when the stopper 1 (21) is extended.

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