An expansion pulley with multiple safety protections and implementation method thereof

Abstract

The present invention discloses an expansion pulley with multiple safety protections, including a pulley handle, a pulley assembly installed on the pulley handle, a composite suspension rod connected to the upper end of the pulley handle, a slider connected to the upper end of the composite suspension rod, and an outer suspension rod and an inner suspension rod, wherein the inner suspension rod is arranged inside the outer suspension rod, the outer suspension rod round nut is engaged at the upper end of the outer suspension rod, the outer suspension rod round nut is also engaged at the upper end of the outer suspension rod, the inner suspension rod nut is engaged at the upper end of the inner suspension rod, and the inner suspension rod nut is also connected at the upper end of the inner suspension rod. A method for realizing an expansion pulley with multiple safety protections is also disclosed. The composite suspension rod of the present invention is composed of an outer suspension rod and an inner suspension rod. When the outer suspension rod suddenly fails during use, the inner suspension rod can continue to assume the hanging function to prevent tourists from falling from a high altitude, thus playing a secondary protection role.

Description

Technical Field

[0001] The present invention belongs to the technical field of expansion pulleys, and in particular relates to an expansion pulley with multiple safety protection features and a method for implementing the same. Background Art

[0002] Indoor expansion slides are very popular in the amusement industry. During the use of the small slides with expansion slides in the industry, there are still many safety features that need to be improved. The main performances are as follows:

[0003] 1. The sliders that match the rails lack the wear warning and identification function. When in use, some sliders will become thinner due to over-wear, which will cause cracks between the sliders and the cylindrical barrel wall, posing a safety risk of separation between the sliders and the rails.

[0004] 2. The slider boom has no secondary protection device. When the root of the boom and the edge of the track are worn beyond the limit and fail, the slider will be separated from the rail, causing a safety risk of people falling;

[0005] 3. The slider boom and the pulley handle are usually fixed by riveting or fasteners, but it is impossible to perform the ultimate tensile test on each riveted part. Due to limited space, fasteners are often prevented from loosening and falling off by applying thread glue. Therefore, without sufficient and safe anti-loosening and interlocking measures, there is a safety risk that the connection node may suddenly loosen during use, resulting in the separation of the boom and the pulley handle. Summary of the invention

[0006] The purpose of the present invention is to provide an expansion pulley with multiple safety protections to solve the problems raised in the above background technology. The expansion pulley with multiple safety protections provided by the present invention has the characteristics of multiple safety protections.

[0007] Another object of the present invention is to provide a method for realizing an expansion pulley with multiple safety protections.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an expansion pulley with multiple safety protections, including a pulley handle, a pulley assembly is installed on the pulley handle, the upper end of the pulley handle is connected to a composite suspension rod, the upper end of the composite suspension rod is connected to a slider, the composite suspension rod includes an outer suspension rod and an inner suspension rod, wherein the inner suspension rod is arranged inside the outer suspension rod, the upper end of the outer suspension rod is engaged with an outer suspension rod round nut, the upper end of the outer suspension rod is also engaged with a anti-loosening nut located above the outer suspension rod round nut, the upper end of the inner suspension rod is engaged with an inner suspension rod nut, and the upper end of the inner suspension rod is also connected to a cotter pin located at the upper end of the inner suspension rod nut.

[0009] In order to provide protection for the outer hanger, avoid wear of the outer hanger, and improve the service life and safety of the outer hanger, a sleeve is further provided on the outside of the outer hanger.

[0010] In order to allow the slider to rotate freely around the composite hanger, and to ensure that the slider will not interfere with the outer hanger round nut and the anti-loosening nut when sliding on the protective slide rail, the slider will continue to cooperate with the slide rail to avoid falling after the slider is completely worn out, thereby further ensuring safety. The slider is suspended to avoid contact and friction between the bottom of the slider and the protective slide rail. It only plays a hanging role when the pulley assembly fails, thereby increasing the service life of the slider. At the same time, it reduces the resistance during sliding and makes sliding smoother. Furthermore, the interior of the slider is provided with a protective gasket, a thrust ball bearing and a slider retaining ring from bottom to top, and the slider retaining ring is located above the outer hanger round nut and embedded in the retaining ring groove on the inner wall of the slider.

[0011] In order to mark the extreme wear position of the slider and facilitate intuitive knowledge of the wear condition of the slider, the slider can be replaced in time to improve safety. Furthermore, an identification groove is provided on the circumference of the slider, and the interior of the identification groove is coated with a red paint layer.

[0012] In order to facilitate the assembly of the inner and outer hangers and to achieve the limiting between the outer and inner hangers, the outer hanger further includes a U-shaped joint and a hollow hanger, wherein one end of the hollow hanger is welded to the U-shaped joint, and a U-shaped groove is provided on the U-shaped joint.

[0013] In order to realize the connection between the outer hanger rod and the pulley handle and prevent the composite hanger rod from rotating, it plays a secondary protection role when the first countersunk bolt fails, and realizes the connection between the inner hanger rod and the pulley handle, further, a slot is provided at the upper end of the pulley handle, and the upper end of the pulley handle is provided with a third hanger rod connecting hole, a second hanger rod connecting hole and a first hanger rod connecting hole corresponding to the slot from top to bottom, a first through hole corresponding to the first hanger rod connecting hole is provided on the U-shaped joint head, a second through hole corresponding to the second hanger rod connecting hole is provided on the U-shaped joint head, and a third through hole corresponding to the third hanger rod connecting hole is provided on the end of the inner hanger rod, wherein the third hanger rod connecting hole is a through hole on one side of the slot and a tapered countersunk hole on the other side of the slot, the third hanger rod connecting hole and the third through hole are connected by a T-shaped welding threaded pair, the second hanger rod connecting hole is a threaded hole on one side of the slot and a tapered countersunk hole on the other side of the slot, the second hanger rod connecting hole and the second through hole are meshed and connected by the first countersunk bolt and the threaded hole of the second hanger rod connecting hole, and the first hanger rod connecting hole and the first through hole are connected by an elastic pin.

[0014] In order to avoid failure caused by loosening of the T-nut and improve safety, the T-shaped welding thread pair further includes a T-shaped nut and a second countersunk bolt, the T-shaped nut is meshed and connected with the second countersunk bolt, and the end of the second countersunk bolt is locked with the T-shaped nut by argon arc spot welding.

[0015] In order to cover the tail countersunk head of the first countersunk bolt, thereby limiting the first countersunk bolt and preventing the first countersunk bolt from loosening and failing, thereby improving safety, further, the tapered countersunk hole of the second boom connecting hole and the tapered countersunk hole of the third boom connecting hole are respectively arranged on both sides of the pulley handle.

[0016] In order to ensure that the pulley bolt can still limit the pulley bearing when the pulley retaining ring fails, and ensure that the pulley does not separate from the pulley bearing, thereby playing a secondary protection role, the pulley assembly further includes a pulley bolt and two pulleys, wherein a pulley mounting hole is provided on the pulley handle, and the two pulleys are respectively installed on both sides of the pulley handle through the pulley bolts, an equal height sleeve is provided between the pulley and the pulley handle, a pulley countersunk hole is provided inside the pulley, and the end of the pulley countersunk hole with a small diameter is located on one side of the pulley handle, two pulley bearings are provided inside the pulley countersunk hole, a spacer is provided between the two pulley bearings, and a pulley retaining ring located outside the pulley bearing is also provided inside the pulley countersunk hole.

[0017] Further in the present invention, the method for realizing an expansion pulley with multiple safety protections comprises the following steps:

[0018] (i) A pulley countersunk hole for installing a pulley bearing is provided inside the pulley, and the end of the pulley countersunk hole with a smaller diameter is located on one side of the pulley handle, and the two pulleys are respectively installed on both sides of the pulley handle by pulley bolts;

[0019] (ii) The composite suspension rod comprises an outer suspension rod and an inner suspension rod. The hollow suspension rod of the outer suspension rod is sleeved on the inner suspension rod. One end of the inner suspension rod provided with a third through hole is placed into the U-shaped groove of the U-shaped joint. The hollow suspension rod is then welded to the U-shaped joint. The round nut and the anti-loosening nut of the outer suspension rod are screwed to the end of the outer suspension rod in sequence and then locked together. The nut of the inner suspension rod is then screwed to the end of the inner suspension rod, and then the cotter pin is fixed and installed.

[0020] (iii) Insert the U-shaped joint into the slot, install the elastic pin, the first countersunk bolt and the T-shaped welding thread pair in sequence, and then lock the end of the second countersunk bolt of the T-shaped welding thread pair with the T-shaped nut by argon arc spot welding;

[0021] (IV) Insert the slider into the upper end of the composite hanger, install the protective gasket and thrust ball bearing in turn, and then install the slider retaining ring so that the outer hanger round nut is located below the slider retaining ring.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The composite suspension rod of the present invention is composed of an outer suspension rod and an inner suspension rod. When the outer suspension rod suddenly fails during use, the inner suspension rod can continue to play a hanging role to prevent tourists from falling from a high altitude, thus playing a secondary protection role.

[0024] 2. The present invention provides a cotter pin above the inner hanger rod nut to prevent the inner hanger rod nut from loosening and falling, thus playing a role of interlocking protection and improving safety.

[0025] 3. The inner suspension rod nut of the present invention is located above the anti-loosening nut, which can play a limiting role when the anti-loosening nut fails, thereby providing a limit for the outer suspension rod round nut and further improving safety.

[0026] 4. The present invention realizes the connection between the outer suspension rod and the pulley handle through the elastic pin and the first countersunk bolt. The setting of the elastic pin can prevent the composite suspension rod from rotating on the one hand, and can play a secondary protection role when the first countersunk bolt fails on the other hand.

[0027] 5. In the present invention, when the pulley retaining ring fails, the pulley bolt can still limit the pulley bearing to ensure that the pulley does not separate from the pulley bearing, thereby playing a role of secondary protection.

[0028] 6. The slider retaining ring of the present invention is located above the round nut of the outer suspension rod. The slider retaining ring cooperates with the round nut of the outer suspension rod to keep the slider in a suspended state, avoiding contact and friction between the bottom of the slider and the protective slide rail. The slider only plays a hanging role when the pulley assembly fails, thereby increasing the service life of the slider and reducing the resistance during sliding, making sliding smoother.

[0029] 7. The slider of the present invention is provided with an identification groove on its circumference, and the interior of the identification groove is coated with a red paint layer for marking the extreme wear position of the slider, so as to intuitively know the wear condition of the slider, thereby enabling the slider to be replaced in time to improve safety.

[0030] 8. The T-shaped welding thread pair of the present invention includes a T-shaped nut and a second countersunk bolt, the T-shaped nut is meshed and connected with the second countersunk bolt, and the end of the second countersunk bolt is locked with the T-shaped nut by argon arc spot welding, so as to avoid the loosening of the T-shaped nut and cause failure, thereby improving safety.

[0031] 9. The tapered countersunk hole of the second hanger connecting hole and the tapered countersunk hole of the third hanger connecting hole of the present invention are respectively arranged on both sides of the pulley handle, and the large circular ring of the T-nut can cover the tail countersunk head of the first countersunk bolt, thereby limiting the first countersunk bolt to avoid loosening and failure of the first countersunk bolt, thereby improving safety.

[0032] 10. The pulley handle of the present invention is made of precision integrally cast 304 stainless steel, which makes the surface of the pulley handle smoother and will not rust during use, greatly improving the experience of tourists.

[0033] 11. The pulley and slider of the present invention are both made of ultra-high molecular weight wear-resistant nylon. Although the hardness of ultra-high molecular weight wear-resistant nylon is lower than that of track steel, it has good toughness and is not easy to cut, so it is very wear-resistant while protecting the track. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 It is a structural schematic diagram of the pulley handle of the present invention;

[0036] Figure 3 It is a schematic diagram of the structure of the pulley assembly of the present invention;

[0037] Figure 4 It is a cross-sectional structural schematic diagram of the connection between the pulley assembly and the pulley handle of the present invention;

[0038] Figure 5 It is a schematic diagram of the structure explosion of the pulley of the present invention;

[0039] Figure 6 It is a schematic cross-sectional structural diagram of the pulley of the present invention;

[0040] Figure 7 It is a schematic diagram of the explosion structure of the composite hanger of the present invention;

[0041] Figure 8 It is a structural schematic diagram of the composite suspension rod of the present invention;

[0042] Fig. 9 It is a structural schematic diagram of the outer suspension rod of the present invention;

[0043] Fig.10 It is an exploded schematic diagram of the structure of the composite suspension rod and the pulley handle connected to the present invention;

[0044] Fig.11 It is a cross-sectional structural schematic diagram of the connection between the composite suspension rod and the pulley handle of the present invention;

[0045] Fig.12 It is a schematic diagram of the structural explosion of the slider of the present invention;

[0046] Fig.13 It is a cross-sectional structural schematic diagram of the connection between the slider and the composite suspension rod of the present invention;

[0047] Fig.14 It is a structural schematic diagram of the T-shaped welding thread pair of the present invention.

[0048] In the figure: 1. Pulley handle; 101. Pulley mounting hole; 102. First suspension rod connection hole; 103. Second suspension rod connection hole; 104. Third suspension rod connection hole; 105. Slot; 2. Pulley assembly; 21. Pulley bolt; 22. Pulley; 23. Equal height sleeve; 24. Pulley bearing; 25. Spacer; 26. Pulley retaining ring; 27. Pulley countersunk hole; 3. Composite suspension rod; 31. External suspension rod; 311. U-shaped joint; 312. Hollow suspension rod; 313 , first through hole; 314, second through hole; 315, U-shaped groove; 32, inner hanger; 321, third through hole; 33, sleeve; 34, outer hanger round nut; 35, inner hanger nut; 36, cotter pin; 37, anti-loosening nut; 4, slider; 41, identification groove; 42, thrust ball bearing; 43, slider retaining ring; 44, protective gasket; 5, T-shaped welding thread pair; 51, T-shaped nut; 52, second countersunk bolt; 6, elastic pin; 7, first countersunk bolt. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Example 1

[0051] See also Figure 1-Figure 14 The present invention provides the following technical solutions: an expansion pulley with multiple safety protections, including a pulley handle 1, a pulley assembly 2 is installed on the pulley handle 1, the upper end of the pulley handle 1 is connected to a composite suspension rod 3, the upper end of the composite suspension rod 3 is connected to a slider 4, the composite suspension rod 3 includes an outer suspension rod 31 and an inner suspension rod 32, wherein the inner suspension rod 32 is arranged inside the outer suspension rod 31, the upper end of the outer suspension rod 31 is meshed with an outer suspension rod round nut 34, the upper end of the outer suspension rod 31 is also meshed with a lock nut 37 located above the outer suspension rod round nut 34, the upper end of the inner suspension rod 32 is meshed with an inner suspension rod nut 35, and the upper end of the inner suspension rod 32 is also connected to a cotter pin 36 located at the upper end of the inner suspension rod nut 35.

[0052] By adopting the above technical scheme, the composite hanger 3 of the present invention is composed of an outer hanger 31 and an inner hanger 32. When the outer hanger 31 suddenly fails during use, the inner hanger 32 can continue to assume the hanging function to prevent tourists from falling from a high altitude, thereby playing a secondary protection role; the present invention arranges a cotter pin 36 above the inner hanger nut 35 to prevent the inner hanger nut 35 from loosening and falling, thereby playing a role of interlocking protection and improving safety; the inner hanger nut 35 of the present invention is located above the anti-loosening nut 37, and can play a limiting role when the anti-loosening nut 37 fails, thereby providing a limiting function for the outer hanger round nut 34 and further improving safety.

[0053] Specifically, a sleeve 33 is sleeved on the outside of the outer suspension rod 31 .

[0054] By adopting the above technical solution, the outer suspension rod 31 is protected, the outer suspension rod 31 is prevented from being worn, and the service life and safety of the outer suspension rod 31 are improved.

[0055] Specifically, a protective gasket 44 , a thrust ball bearing 42 and a slider retaining ring 43 are sequentially arranged inside the slider 4 from bottom to top.

[0056] By adopting the above technical solution, the thrust ball bearing 42 allows the slider 4 to rotate freely around the composite hanger 3, so that when the slider 4 slides on the protective slide rail, it will not interfere with the outer hanger round nut 34 and the anti-loosening nut 37, thereby reducing the possibility of failure of the outer hanger round nut 34 and the anti-loosening nut 37; the protective gasket 44 can continue to cooperate with the slide rail after the slider 4 is completely worn, thereby preventing it from falling, thereby further ensuring safety.

[0057] Specifically, the outer suspension rod 31 includes a U-shaped joint 311 and a hollow suspension rod 312 , wherein one end of the hollow suspension rod 312 is welded to the U-shaped joint 311 , and a U-shaped groove 315 is provided on the U-shaped joint 311 .

[0058] By adopting the above technical solution, the assembly of the inner suspension rod 32 and the outer suspension rod 31 is facilitated, and the position limiting between the outer suspension rod 31 and the inner suspension rod 32 is achieved.

[0059] Specifically, a slot 105 is provided at the upper end of the pulley handle 1, and a third suspension rod connection hole 104, a second suspension rod connection hole 103 and a first suspension rod connection hole 102 corresponding to the slot 105 are provided at the upper end of the pulley handle 1 in sequence from top to bottom, a first through hole 313 corresponding to the first suspension rod connection hole 102 is provided on the U-shaped joint 311, a second through hole 314 corresponding to the second suspension rod connection hole 103 is provided on the U-shaped joint 311, and a third through hole 321 corresponding to the third suspension rod connection hole 104 is provided on the end of the inner suspension rod 32, wherein the third suspension rod connection hole 104 is provided in the slot 105. One side of the slot 105 is a through hole, and the other side of the slot 105 is a tapered countersunk hole. The third hanger connecting hole 104 is connected to the third through hole 321 by a T-shaped welding threaded pair 5. The second hanger connecting hole 103 is a threaded hole on one side of the slot 105, and is a tapered countersunk hole on the other side of the slot 105. The second hanger connecting hole 103 is meshed with the second through hole 314 by a first countersunk bolt 7 and the threaded hole of the second hanger connecting hole 103. The first hanger connecting hole 102 is connected to the first through hole 313 by an elastic pin 6. The T-shaped welding threaded pair 5 realizes the connection between the inner hanger 32 and the pulley handle 1.

[0060] By adopting the above technical solution, the connection between the outer suspension rod 31 and the pulley handle 1 is achieved through the elastic pin 6 and the first countersunk bolt 7. The setting of the elastic pin 6 can prevent the composite suspension rod 3 from rotating on the one hand, and on the other hand, it can play a secondary protection role when the first countersunk bolt 7 fails.

[0061] Specifically, the pulley assembly 2 includes a pulley bolt 21 and two pulleys 22, wherein a pulley mounting hole 101 is provided on the pulley handle 1, and the two pulleys 22 are respectively installed on both sides of the pulley handle 1 through the pulley bolts 21, and an equal height sleeve 23 is provided between the pulley 22 and the pulley handle 1, and a pulley countersunk hole 27 is provided inside the pulley 22, and the end of the pulley countersunk hole 27 with a small diameter is located on one side of the pulley handle 1, and two pulley bearings 24 are provided inside the pulley countersunk hole 27, and a spacer gasket 25 is provided between the two pulley bearings 24, and a pulley retaining ring 26 located outside the pulley bearing 24 is also provided inside the pulley countersunk hole 27.

[0062] By adopting the above technical solution, when the pulley retaining ring 26 fails, the pulley bolt 21 can still limit the pulley bearing 24 to ensure that the pulley 22 does not separate from the pulley bearing 24, thereby playing a role of secondary protection.

[0063] Example 2

[0064] The present embodiment is different from the first embodiment in that: specifically, the slider retaining ring 43 is located above the outer suspension rod round nut 34 and is embedded in the retaining ring groove on the inner wall of the slider 4 .

[0065] By adopting the above technical solution, the slider 4 is in a suspended state through the cooperation of the slider retaining ring 43 and the outer suspension rod round nut 34, avoiding the contact and friction between the bottom of the slider 4 and the protective slide rail. The slider 4 only plays a hanging role when the pulley assembly 2 fails, thereby increasing the service life of the slider 4 and reducing the resistance during sliding, making sliding smoother.

[0066] Example 3

[0067] The present embodiment is different from the embodiment 1 in that: specifically, a marking groove 41 is provided on the circumference of the sliding block 4 , and the interior of the marking groove 41 is coated with a red paint layer.

[0068] By adopting the above technical solution, the extreme wear position of the slider 4 is marked, so that the wear condition of the slider 4 can be intuitively known, so that the slider 4 can be replaced in time to improve safety.

[0069] Example 4

[0070] The present embodiment is different from the embodiment 1 in that: specifically, the T-shaped welding thread pair 5 includes a T-shaped nut 51 and a second countersunk bolt 52, the T-shaped nut 51 is meshedly connected with the second countersunk bolt 52, and the end of the second countersunk bolt 52 is locked with the T-shaped nut 51 by argon arc spot welding.

[0071] By adopting the above technical solution, the loosening of the T-nut 51 and resulting in failure can be avoided, thereby improving safety.

[0072] Specifically, the tapered countersunk hole of the second suspension rod connecting hole 103 and the tapered countersunk hole of the third suspension rod connecting hole 104 are respectively arranged on both sides of the pulley handle 1 .

[0073] By adopting the above technical solution, the large ring of the T-nut 51 can cover the tail countersunk head of the first countersunk bolt 7, thereby limiting the first countersunk bolt 7, achieving the function of preventing retreat and loosening, avoiding the first countersunk bolt 7 from loosening and failing, and improving safety.

[0074] Example 5

[0075] Furthermore, the method for realizing an expansion pulley with multiple safety protections described in the present invention comprises the following steps:

[0076] (i) A pulley countersunk hole 27 for mounting a pulley bearing 24 is provided inside the pulley 22, and the end of the pulley countersunk hole 27 with a smaller diameter is located on one side of the pulley handle 1, and the two pulleys 22 are respectively mounted on both sides of the pulley handle 1 through the pulley bolts 21;

[0077] (ii) The composite suspension rod 3 comprises an outer suspension rod 31 and an inner suspension rod 32. The hollow suspension rod 312 of the outer suspension rod 31 is sleeved on the inner suspension rod 32. One end of the inner suspension rod 32 provided with the third through hole 321 is placed into the U-shaped groove 315 of the U-shaped joint 311. The hollow suspension rod 312 is then welded to the U-shaped joint 311. The outer suspension rod round nut 34 and the anti-loosening nut 37 are screwed to the end of the outer suspension rod 31 in sequence and then locked with each other. The inner suspension rod nut 35 is then screwed to the end of the inner suspension rod 32, and then the cotter pin 36 is fixedly installed.

[0078] (III) Insert the U-shaped joint 311 into the slot 105, install the elastic pin 6, the first countersunk bolt 7 and the T-shaped welding thread pair 5 in sequence, and then lock the end of the second countersunk bolt of the T-shaped welding thread pair 5 with the T-shaped nut by argon arc spot welding;

[0079] (IV) Insert the slider 4 into the upper end of the composite suspension rod 3, install the protective gasket 44 and the thrust ball bearing 42 in sequence, and then install the slider retaining ring 43, so that the outer suspension rod round nut 34 is located below the slider retaining ring 43.

[0080] In summary, the composite suspension rod 3 of the present invention is composed of an outer suspension rod 31 and an inner suspension rod 32. When the outer suspension rod 31 suddenly fails during use, the inner suspension rod 32 can continue to play a hanging role to prevent tourists from falling from a high altitude, thereby playing a secondary protection role. The present invention arranges a cotter pin 36 above the inner suspension rod nut 35 to prevent the inner suspension rod nut 35 from loosening and falling, thereby playing a role of interlocking protection and improving safety. The inner suspension rod nut 35 of the present invention is located above the anti-loosening nut 37, so as to play a limiting role when the anti-loosening nut 37 fails, thereby providing a limiting role for the outer suspension rod round nut 34 and further improving safety. The present invention realizes the outer suspension rod round nut 34 through the elastic pin 6 and the first countersunk bolt 7. The connection between the suspension rod 31 and the pulley handle 1, the setting of the elastic pin 6 can prevent the composite suspension rod 3 from rotating on the one hand, and can play a secondary protection role when the first countersunk bolt 7 fails on the other hand; when the pulley retaining ring 26 of the present invention fails, the pulley bolt 21 can still limit the pulley bearing 24 to ensure that the pulley 22 does not separate from the pulley bearing 24, thereby playing a secondary protection role; the slider retaining ring 43 of the present invention is located above the outer suspension rod round nut 34, and the slider retaining ring 43 cooperates with the outer suspension rod round nut 34 to keep the slider 4 in a suspended state, avoiding contact and friction between the bottom of the slider 4 and the protective slide rail, and only plays a hanging role when the pulley assembly 2 fails, thereby increasing the service life of the slider 4. life, while reducing the resistance during sliding, making sliding smoother; an identification groove 41 is provided on the circumference of the slider 4 of the present invention, and the interior of the identification groove 41 is coated with a red paint layer for marking the extreme wear position of the slider 4, which is convenient for intuitively knowing the wear condition of the slider 4, so that the slider 4 can be replaced in time to improve safety; the T-shaped welding thread pair 5 of the present invention includes a T-shaped nut and a second countersunk bolt, the T-shaped nut is meshed and connected with the second countersunk bolt, and the end of the second countersunk bolt is locked with the T-shaped nut by argon arc spot welding to avoid failure caused by loosening of the T-shaped nut, thereby improving safety; the tapered countersunk hole of the second suspension rod connecting hole 103 of the present invention and the third suspension rod connecting hole The tapered countersunk holes 104 are respectively arranged on both sides of the pulley handle 1, and the large circular ring of the T-nut 51 can cover the tail countersunk head of the first countersunk bolt 7, thereby limiting the first countersunk bolt 7, avoiding the first countersunk bolt 7 from loosening and failing, and improving safety; the pulley handle 1 of the present invention adopts 304 stainless steel material that is precisely cast in one piece, so that the surface of the pulley handle 1 is smoother and will not rust during use, which greatly improves the experience of tourists; the pulley 22 and the slider 4 of the present invention are both made of ultra-high molecular weight wear-resistant nylon. Although the hardness of ultra-high molecular weight wear-resistant nylon is lower than that of track steel, it has good toughness and is not easy to cut, so it is very wear-resistant while protecting the track.

[0081] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An expansion pulley with multiple safety protection features: It includes a pulley handle, a pulley assembly is installed on the pulley handle, the upper end of the pulley handle is connected to a composite hanger, the upper end of the composite hanger is connected to a slider, the composite hanger includes an outer hanger and an inner hanger, wherein the inner hanger is arranged inside the outer hanger, the upper end of the outer hanger is meshed with an outer hanger round nut, the upper end of the outer hanger is also meshed with a lock nut located above the outer hanger round nut, the upper end of the inner hanger is meshed with an inner hanger nut, and the upper end of the inner hanger is also connected to a cotter pin located at the upper end of the inner hanger nut.

2. The expansion pulley with multiple safety protections according to claim 1, characterized in that: The outer part of the outer suspension rod is sleeved with a sleeve.

3. The expansion pulley with multiple safety protections according to claim 1, characterized in that: The interior of the slider is provided with a protective gasket, a thrust ball bearing and a slider retaining ring in sequence from bottom to top, and the slider retaining ring is located above the round nut of the outer suspension rod and embedded in the retaining ring groove on the inner wall of the slider.

4. The expansion pulley with multiple safety protections according to claim 1, characterized in that: A marking groove is arranged on the circumference of the sliding block, and the interior of the marking groove is coated with a red paint layer.

5. The expansion pulley with multiple safety protections according to claim 1, characterized in that: The outer suspension rod comprises a U-shaped joint and a hollow suspension rod, wherein one end of the hollow suspension rod is welded to the U-shaped joint, and a U-shaped groove is provided on the U-shaped joint.

6. The expansion pulley with multiple safety protections according to claim 5, characterized in that: A slot is provided at the upper end of the pulley handle, and a third hanger rod connecting hole, a second hanger rod connecting hole and a first hanger rod connecting hole corresponding to the slot are provided at the upper end of the pulley handle from top to bottom in sequence, a first through hole corresponding to the first hanger rod connecting hole is provided on the U-shaped joint head, a second through hole corresponding to the second hanger rod connecting hole is provided on the U-shaped joint head, and a third through hole corresponding to the third hanger rod connecting hole is provided on the end of the inner hanger, wherein the third hanger rod connecting hole is a through hole on one side of the slot and a tapered countersunk hole on the other side of the slot, the third hanger rod connecting hole is connected to the third through hole by a T-shaped welding threaded pair, the second hanger rod connecting hole is a threaded hole on one side of the slot and a tapered countersunk hole on the other side of the slot, the second hanger rod connecting hole and the second through hole are meshed with the threaded hole of the second hanger rod connecting hole by a first countersunk bolt, and the first hanger rod connecting hole and the first through hole are connected by an elastic pin.

7. The expansion pulley with multiple safety protections according to claim 6, characterized in that: The T-shaped welding thread pair comprises a T-shaped nut and a second countersunk bolt, the T-shaped nut is meshed and connected with the second countersunk bolt, and the end of the second countersunk bolt is locked with the T-shaped nut by argon arc spot welding.

8. The expansion pulley with multiple safety protections according to claim 6, characterized in that: The tapered countersunk hole of the second suspension rod connecting hole and the tapered countersunk hole of the third suspension rod connecting hole are respectively arranged on both sides of the pulley handle.

9. The expansion pulley with multiple safety protections according to claim 1, characterized in that: The pulley assembly includes a pulley bolt and two pulleys, wherein a pulley mounting hole is provided on the pulley handle, and the two pulleys are respectively installed on both sides of the pulley handle through the pulley bolts, an equal height sleeve is provided between the pulley and the pulley handle, a pulley countersunk hole is provided inside the pulley, and the end of the pulley countersunk hole with a small diameter is located on one side of the pulley handle, two pulley bearings are provided inside the pulley countersunk hole, a spacer is provided between the two pulley bearings, and a pulley retaining ring is also provided inside the pulley countersunk hole and located on the outside of the pulley bearings.

10. A method for implementing an expansion pulley with multiple safety protections according to any one of claims 1 to 9, characterized in that: The following steps are involved: (i) A pulley countersunk hole for installing a pulley bearing is provided inside the pulley, and the end of the pulley countersunk hole with a smaller diameter is located on one side of the pulley handle, and the two pulleys are respectively installed on both sides of the pulley handle by pulley bolts; (ii) The composite suspension rod comprises an outer suspension rod and an inner suspension rod. The hollow suspension rod of the outer suspension rod is sleeved on the inner suspension rod. One end of the inner suspension rod provided with a third through hole is placed into the U-shaped groove of the U-shaped joint. The hollow suspension rod is then welded to the U-shaped joint. The round nut and the anti-loosening nut of the outer suspension rod are screwed to the end of the outer suspension rod in sequence and then locked together. The nut of the inner suspension rod is then screwed to the end of the inner suspension rod, and then the cotter pin is fixed and installed. (iii) Insert the U-shaped joint into the slot, install the elastic pin, the first countersunk bolt and the T-shaped welding thread pair in sequence, and then lock the end of the second countersunk bolt of the T-shaped welding thread pair with the T-shaped nut by argon arc spot welding; (IV) Insert the slider into the upper end of the composite hanger, install the protective gasket and thrust ball bearing in turn, and then install the slider retaining ring so that the outer hanger round nut is located below the slider retaining ring.

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