A handle type speed reducer for a railway tunnel protective door

Abstract

The utility model discloses a handle type speed reducer for railway tunnel protective door, it includes: mounting seat and connecting rod subassembly, mounting seat and the middle part fixed connection of protective door inner frame, rotates and installs the pivot on the mounting seat, and the both ends of pivot are fixedly installed one handle respectively, and connecting rod subassembly includes handle, first connecting rod and second connecting rod, and the middle part of handle is fixedly connected with the middle part of pivot, and the both ends of handle are rotatably connected with first connecting rod and second connecting rod respectively, and the top of first connecting rod is rotatably connected with the bottom of first lock bar, and first lock bar is arranged in first sleeve, and the bottom of second connecting rod is rotatably connected with the top of second lock bar, and second lock bar is arranged in second sleeve, and first sleeve and second sleeve are fixedly connected with the top and bottom of protective door inner frame respectively, and first lock bar and second lock bar are matched with the lock hole on protective door door frame respectively. The utility model's simple structure, convenient installation, production cost is lower, can reduce the production cost of railway tunnel protective door.

Description

Technical Field

[0001] This utility model relates to the field of railway tunnel protective door technology, and in particular to a handle-type speed reducer for railway tunnel protective doors. Background Technology

[0002] When a train passes through a tunnel, it generates strong lateral winds on both sides of the train, which can adversely affect the workers, structures, and equipment inside the tunnel. In addition, with the large-scale construction of high-speed railways, there are more and more railway tunnels, and the design issues of fire prevention and rescue in tunnels are becoming increasingly prominent. As the first disaster prevention barrier for personnel evacuation channels, railway tunnel protective doors play a vital role. Hand-operated speed reducers are required when opening and closing railway tunnel protective doors.

[0003] Currently, the speed reducers used in railway tunnel protective doors generally have a relatively complex structure, such as planetary speed reducers or worm gear speed reducers. The structures of these speed reducers are relatively complex and the cost is relatively high, resulting in a higher overall product cost. Utility Model Content

[0004] The purpose of this utility model is to provide a handle-type speed reducer for railway tunnel protective doors, which has a simple structure, is easy to install, and has a low production cost, thus effectively reducing the production cost of railway tunnel protective doors.

[0005] To achieve the above and other related objectives, this utility model provides a handle-type reducer for railway tunnel protective doors, comprising: a mounting base and a linkage assembly. The mounting base is fixedly connected to the middle of the inner frame of the protective door. A rotating shaft is rotatably mounted on the mounting base, with its two ends respectively passing through and rotatably connected to two door panels of the protective door. A handle is fixedly mounted at each end of the rotating shaft, one of which has a lock lug. The linkage assembly includes a handle, a first linkage, and a second linkage. The middle of the handle is fixedly connected to the middle of the rotating shaft, and the handle and the rotating shaft are perpendicular to each other. The two ends of the rotating handle are rotatably connected to the bottom end of the first connecting rod and the top end of the second connecting rod, respectively. The top end of the first connecting rod is rotatably connected to the bottom end of the first locking rod. The first locking rod passes through the first sleeve and is slidably connected to the first sleeve. The first sleeve is fixedly connected to the top of the inner frame of the protective door. The bottom end of the second connecting rod is rotatably connected to the top end of the second locking rod. The second locking rod passes through the second sleeve and is slidably connected to the second sleeve. The second sleeve is fixedly connected to the bottom of the inner frame of the protective door. The first locking rod and the second locking rod respectively cooperate with the lock holes on the door frame of the protective door.

[0006] In one example of the handle-type reducer for railway tunnel protective doors of this utility model, the mounting base includes a base plate and two side plates. The bottoms of the two side plates are respectively vertically fixed to the middle of the top surfaces of the base plate. The base plate is fixedly connected to the middle of the inner frame of the protective door. One end of the base plate is provided with a mounting groove that cooperates with the second connecting rod.

[0007] In one example of the handle-type reducer for railway tunnel protective doors of this utility model, the bottom plate is provided with two first bolt holes at both ends. The first bolt holes are fixedly connected to the inner frame of the protective door by first bolts. A horizontal plate is vertically fixed on the opposite side of the bottom of the two side plates. A second bolt hole is provided at both ends of each horizontal plate. The second bolt holes are fixedly connected to the bottom plate by second bolts.

[0008] In one example of the handle-type reducer for railway tunnel protective doors of this utility model, the rotating shaft includes a first mounting part, the two ends of the first mounting part are respectively fixedly connected to one end of a second mounting part, the other ends of the two second mounting parts are respectively fixedly connected to one end of a third mounting part, the first mounting part is fixedly connected to the middle of the rotating handle, and the two second mounting parts are respectively fixedly connected to the two handles.

[0009] In one example of the lever-type reducer for railway tunnel protective doors of this utility model, the center of the handle is provided with a first mounting hole, the inner wall of the first mounting hole is provided with a first positioning groove, the outer wall of the first mounting part is provided with a first positioning pin mounting groove, the outer walls of the first mounting part on both sides of the first positioning pin mounting groove are respectively provided with a first retaining spring groove, the two side plates are respectively provided with a third mounting hole, the first mounting part passes through the first mounting hole and the two third mounting holes, a positioning pin is installed in the first positioning pin mounting groove, the positioning pin cooperates with the first positioning groove, a first retaining spring is installed in the two first retaining spring grooves respectively, the two first retaining springs cooperate with the opposite surfaces of the two side plates respectively, and the two end faces of the handle cooperate with the opposite surfaces of the two side plates respectively.

[0010] In one example of the handle-type reducer for railway tunnel protective doors of this utility model, a sleeve is fixedly installed at one end of the handle, a second mounting hole is provided along the middle of the sleeve, a second positioning groove is provided on the inner wall of the second mounting hole, a second positioning pin mounting groove is provided on the outer wall of the second mounting part away from the first mounting part, a second snap ring groove is provided at the connection between the third mounting part and the second mounting part, the second mounting part passes through the second mounting hole, a positioning pin is installed in the second positioning pin mounting groove, the positioning pin cooperates with the second positioning groove, a second snap ring is installed in the second snap ring groove, and the two end faces of the sleeve cooperate with one end face of the first mounting part and the second snap ring, respectively.

[0011] In one example of the handle-type reducer for railway tunnel protective doors of this utility model, the handle is vertically fixed to the outer wall of the sleeve at the end away from the first mounting part.

[0012] In one example of the lever-type reducer for railway tunnel protective doors of this utility model, the two ends of the handle are rotatably connected to the ends of the first connecting rod and the second connecting rod respectively via a first pin.

[0013] In one example of the lever-type reducer for railway tunnel protective doors of this utility model, the end of the first connecting rod is rotatably connected to the end of the first locking rod through a second pin, and the end of the second connecting rod is rotatably connected to the end of the second locking rod through a third pin.

[0014] In one example of the lever-type reducer for railway tunnel protective doors of this utility model, a first limiting groove is provided on the outer wall of the first locking rod along the extension direction of the first locking rod, a first wing plate is provided on the outer wall of one end of the first sleeve, and two third bolt holes are provided on the first wing plate. The third bolt holes are fixedly connected to the inner frame of the protective door by third bolts. A first ball bushing is fixedly installed on the end of the first sleeve away from the first wing plate. The first ball bushing is slidably connected to the first locking rod. A first limiting rod is threadedly connected to the outer wall of the first sleeve, and the end of the first limiting rod is slidably connected to the first limiting groove.

[0015] In one example of the lever-type reducer for railway tunnel protective doors of this utility model, a second limiting groove is provided on the outer wall of the second locking rod along the extension direction of the second locking rod, a second wing plate is provided on the outer wall of one end of the second sleeve, and two fourth bolt holes are provided on the second wing plate. The fourth bolt holes are fixedly connected to the inner frame of the protective door by the fourth bolts. A second ball bushing is fixedly installed on the end of the second sleeve away from the second wing plate. The second ball bushing is slidably connected to the second locking rod. A second limiting rod is threadedly connected to the outer wall of the second sleeve, and the end of the second limiting rod is slidably connected to the second limiting groove.

[0016] This utility model relates to a railway tunnel protective door. The mounting base of the lever-type reducer is fixedly installed on the inner frame of the protective door. A linkage assembly allows for locking and opening of the protective door. Controlling the lever drives the rotating shaft, which in turn drives the rotating handle. The two ends of the handle respectively drive the first and second connecting rods. The first connecting rod drives the first locking rod to slide within the first sleeve, and the second connecting rod drives the second locking rod to slide within the second sleeve. Thus, the first and second connecting rods respectively drive the first and second locking rods to move in and out of the lock holes on the protective door frame, completing the locking and opening of the railway tunnel protective door. The lock lug on the lever cooperates with the locking structure on the railway tunnel protective door, such as a lock head or bolt, to prevent accidental opening of the lever. This utility model has a simple structure, is easy to install, and has low production costs, effectively reducing the production cost of railway tunnel protective doors. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a embodiment of the lever-type speed reducer for railway tunnel protective doors according to this utility model;

[0018] Figure 2 This is an installation diagram of an embodiment of the lever-type speed reducer for railway tunnel protective doors of this utility model;

[0019] Figure 3 This is a perspective view of an embodiment of the lever-type speed reducer for railway tunnel protective doors according to this utility model;

[0020] Figure 4 This is a partial structural schematic diagram of a handle-type speed reducer for railway tunnel protective doors according to this utility model;

[0021] Figure 5 This is a schematic diagram of the mounting base in one embodiment of the lever-type reducer for railway tunnel protective doors of this utility model;

[0022] Figure 6 This is a schematic diagram of the rotating shaft in one embodiment of the lever-type reducer for railway tunnel protective doors of this utility model;

[0023] Figure 7 This is a schematic diagram of the handle structure in one embodiment of the lever-type reducer for railway tunnel protective doors of this utility model;

[0024] Figure 8 This is a schematic diagram of the handle structure in one embodiment of the handle-type reducer for railway tunnel protective doors of this utility model;

[0025] Figure 9 This is a schematic diagram of the structure of the first locking rod in one embodiment of the lever-type reducer for railway tunnel protective doors of this utility model;

[0026] Figure 10 This is a schematic diagram of the structure of the first sleeve in one embodiment of the lever-type reducer for railway tunnel protective doors of this utility model.

[0027] Component designation:

[0028] 100 Mounting base; 110 Base plate; 111 Mounting groove; 112 First bolt hole; 120 Side plate; 121 Horizontal plate; 122 Second bolt hole; 123 Third mounting hole; 200 Linkage assembly; 210 Rotary handle; 211 First mounting hole; 212 First positioning groove; 213 First pin; 220 First connecting rod; 221 Second pin; 230 Second connecting rod; 231 Third pin; 240 First locking rod; 241 First limiting groove; 250 First sleeve; 251 First wing plate; 252 Third bolt hole; 253 First ball bearing. Bushing; 254 First limiting rod; 260 Second locking rod; 270 Second sleeve; 300 Rotating shaft; 310 First mounting part; 311 First positioning pin mounting groove; 312 First snap ring groove; 320 Second mounting part; 321 Second positioning pin mounting groove; 322 Second snap ring groove; 330 Third mounting part; 400 Handle; 410 Lock nose; 420 Sleeve; 421 Second mounting hole; 422 Second positioning groove; 500 Inner frame of protective door; 600 Door panel; 700 Door frame of protective door; 810 First snap ring; 820 Second snap ring. Detailed Implementation

[0029] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0030] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0031] Please see Figures 1 to 10 This utility model provides a handle-type reducer for railway tunnel protective doors, which includes: a mounting base 100 and a connecting rod assembly 200. The mounting base 100 is fixedly connected to the middle of the inner frame 500 of the protective door. A rotating shaft 300 is rotatably mounted on the mounting base 100. The two ends of the rotating shaft 300 are respectively passed through the two door panels 600 of the protective door. The rotating shaft 300 is rotatably connected to the door panels 600. A handle 400 is fixedly mounted on each end of the rotating shaft 300. One of the handles 400 is provided with a lock lug 410. The linkage assembly 200 includes a handle 210, a first connecting rod 220, and a second connecting rod 230. The middle part of the handle 210 is fixedly connected to the middle part of the rotating shaft 300. The handle 210 is perpendicular to the rotating shaft 300. The two ends of the handle 210 are rotatably connected to the bottom end of the first connecting rod 220 and the top end of the second connecting rod 230, respectively. The top end of the first connecting rod 220 is rotatably connected to the bottom end of the first locking rod 240. The first locking rod 240 passes through the first sleeve 250. The first locking rod 240 is connected to... The first sleeve 250 is slidably connected and fixedly connected to the top of the inner frame 500 of the protective door. The bottom end of the second connecting rod 230 is rotatably connected to the top end of the second locking rod 260. The second locking rod 260 passes through the second sleeve 270 and is slidably connected to the second sleeve 270. The second sleeve 270 is fixedly connected to the bottom of the inner frame 500 of the protective door. The first locking rod 240 and the second locking rod 260 respectively cooperate with the lock holes on the door frame 700 of the protective door.

[0032] The mounting base 100 of this utility model is fixedly installed on the inner frame 500 of the protective door. The locking and opening of the railway tunnel protective door can be completed by the linkage assembly 200. The control handle 400 drives the rotating shaft 300 to rotate, and the rotating shaft 300 drives the rotating handle 210 to rotate. The two ends of the rotating handle 210 respectively drive the first connecting rod 220 and the second connecting rod 230 to move. The first connecting rod 220 drives the first locking rod 240 to slide in the first sleeve 250, and the second connecting rod 230 drives the second locking rod 260 to slide in the second sleeve 270. Thus, the first connecting rod 220 and the second connecting rod 230 respectively drive the first locking rod 240 and the second locking rod 260 to move in and out of the lock hole on the door frame 700 of the protective door, thereby completing the locking and opening of the railway tunnel protective door. The lock lug 410 on the handle 400 cooperates with the locking structure on the railway tunnel protective door, such as the lock head and the bolt, which can prevent the handle 400 from being opened accidentally.

[0033] Please see Figure 5In one example of the handle-type reducer for railway tunnel protective doors of this utility model, the mounting base 100 includes a base plate 110 and two side plates 120. The bottoms of the two side plates 120 are vertically fixedly connected to the middle of the top surfaces of the base plate 110 on both sides. The base plate 110 is fixedly connected to the middle of the inner frame 500 of the protective door. One end of the base plate 110 is provided with a mounting groove 111 that cooperates with the second connecting rod 230. Two first bolt holes 112 are provided at both ends of the base plate 110. The first bolt holes 112 are fixedly connected to the inner frame 500 of the protective door by first bolts. A horizontal plate 121 is vertically fixedly installed on the opposite sides of the bottom of the two side plates 120. Each horizontal plate 121 is provided with a second bolt hole 122 at both ends. The second bolt holes 122 are fixedly connected to the base plate 110 by second bolts.

[0034] Please see Figures 4 to 8In one example of the handle-type reducer for railway tunnel protective doors of this utility model, the rotating shaft 300 includes a first mounting part 310, the two ends of the first mounting part 310 are respectively fixedly connected to one end of a second mounting part 320, the other ends of the two second mounting parts 320 are respectively fixedly connected to one end of a third mounting part 330, the first mounting part 310 is fixedly connected to the middle part of the rotating handle 210, and the two second mounting parts 320 are respectively fixedly connected to the two handles 400. The handle 210 has a first mounting hole 211 in the middle, and a first positioning groove 212 on the inner wall of the first mounting hole 211. The outer wall of the first mounting part 310 has a first positioning pin mounting groove 311. A first retaining ring groove 312 is provided on the outer wall of the first mounting part 310 on both sides of the first positioning pin mounting groove 311. A third mounting hole 123 is provided on each of the two side plates 120. The first mounting part 310 passes through the first mounting hole 211 and the two third mounting holes 123. A positioning pin is installed in the first positioning pin mounting groove 311. The positioning pin cooperates with the first positioning groove 212. A first retaining ring 810 is installed in each of the two first retaining ring grooves 312. The two first retaining rings 810 cooperate with the opposite surfaces of the two side plates 120. The two end faces of the handle 210 cooperate with the opposite surfaces of the two side plates 120. One end of the handle 400 is fixedly mounted with a sleeve 420. A second mounting hole 421 is provided along the middle of the sleeve 420. A second positioning groove 422 is provided on the inner wall of the second mounting hole 421. A second positioning pin mounting groove 321 is provided on the outer wall of the end of the second mounting part 320 away from the first mounting part 310. A second snap ring groove 322 is provided at the connection between the third mounting part 330 and the second mounting part 320. The second mounting part 320 passes through the second mounting hole 421. A positioning pin is installed in the second positioning pin mounting groove 321, and the positioning pin cooperates with the second positioning groove 422. A second snap ring 820 is installed in the second snap ring groove 322. The two end faces of the sleeve 420 cooperate with one end face of the first mounting part 310 and the second snap ring 820, respectively. The handle 400 is vertically fixedly connected to the outer wall of the end of the sleeve 420 away from the first mounting part 310.

[0035] Please see Figure 1 In one example of the handle-type reducer for railway tunnel protective doors of this utility model, the two ends of the rotating handle 210 are rotatably connected to the ends of the first connecting rod 220 and the second connecting rod 230 respectively via a first pin 213. The end of the first connecting rod 220 is rotatably connected to the end of the first locking rod 240 via a second pin 221, and the end of the second connecting rod 230 is rotatably connected to the end of the second locking rod 260 via a third pin 231.

[0036] Please see Figure 9 and Figure 10 In one example of the lever-type reducer for railway tunnel protective doors of this utility model, a first limiting groove 241 is provided on the outer wall of the first locking rod 240 along the extension direction of the first locking rod 240. A first wing plate 251 is provided on the outer wall of one end of the first sleeve 250. Two third bolt holes 252 are provided on the first wing plate 251. The third bolt holes 252 are fixedly connected to the inner frame 500 of the protective door by third bolts. A first ball bushing 253 is fixedly installed on the end of the first sleeve 250 away from the first wing plate 251. The first ball bushing 253 is slidably connected to the first locking rod 240. A first limiting rod 254 is threadedly connected to the outer wall of the first sleeve 250. The end of the first limiting rod 254 is slidably connected to the first limiting groove 241. A second limiting groove is provided on the outer wall of the second locking rod 260 along the extension direction of the second locking rod 260. A second wing plate is provided on the outer wall of one end of the second sleeve 270. Two fourth bolt holes are provided on the second wing plate. The fourth bolt holes are fixedly connected to the inner frame of the protective door by fourth bolts. A second ball bushing is fixedly installed on the end of the second sleeve 270 away from the second wing plate. The second ball bushing is slidably connected to the second locking rod 260. A second limiting rod is threaded on the outer wall of the second sleeve 270. The end of the second limiting rod is slidably connected to the second limiting groove.

[0037] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A handle-type speed reducer for railway tunnel protective doors, characterized in that, include: Mounting base, the mounting base is fixedly connected to the middle of the inner frame of the protective door, a rotating shaft is rotatably mounted on the mounting base, the two ends of the rotating shaft are respectively passed through the two door panels of the protective door and rotatably connected to the door panels, and a handle is fixedly mounted on each end of the rotating shaft, one of the handles is provided with a lock lug; A linkage assembly includes a handle, a first connecting rod, and a second connecting rod. The middle part of the handle is fixedly connected to the middle part of the rotating shaft. The handle is perpendicular to the rotating shaft. The two ends of the handle are rotatably connected to the bottom end of the first connecting rod and the top end of the second connecting rod, respectively. The top end of the first connecting rod is rotatably connected to the bottom end of a first locking rod. The first locking rod passes through a first sleeve and is slidably connected to the first sleeve. The first sleeve is fixedly connected to the top of the inner frame of the protective door. The bottom end of the second connecting rod is rotatably connected to the top end of a second locking rod. The second locking rod passes through a second sleeve and is slidably connected to the second sleeve. The second sleeve is fixedly connected to the bottom of the inner frame of the protective door. The first locking rod and the second locking rod respectively cooperate with the lock holes on the door frame of the protective door.

2. The lever-type speed reducer for railway tunnel protective doors as described in claim 1, characterized in that, The mounting base includes a base plate and two side plates. The bottoms of the two side plates are respectively fixedly and vertically connected to the middle of the top surfaces of the base plate. The base plate is fixedly connected to the middle of the inner frame of the protective door. One end of the base plate is provided with a mounting groove that cooperates with the second connecting rod.

3. The lever-type speed reducer for railway tunnel protective doors as described in claim 2, characterized in that, The bottom plate has two first bolt holes at both ends. The first bolt holes are fixedly connected to the inner frame of the protective door by first bolts. A horizontal plate is vertically fixed on the opposite side of the bottom of the two side plates. A second bolt hole is provided at both ends of each horizontal plate. The second bolt holes are fixedly connected to the bottom plate by second bolts.

4. The lever-type speed reducer for railway tunnel protective doors as described in claim 2, characterized in that, The rotating shaft includes a first mounting part, the two ends of the first mounting part are respectively fixedly connected to one end of a second mounting part, the other ends of the two second mounting parts are respectively fixedly connected to one end of a third mounting part, the first mounting part is fixedly connected to the middle part of the rotating handle, and the two second mounting parts are respectively fixedly connected to the two handles.

5. The lever-type speed reducer for railway tunnel protective doors as described in claim 4, characterized in that, The handle has a first mounting hole in the middle, a first positioning groove on the inner wall of the first mounting hole, a first positioning pin mounting groove on the outer wall of the first mounting part, a first retaining ring groove on the outer wall of the first mounting part on both sides of the first positioning pin mounting groove, a third mounting hole on each of the two side plates, the first mounting part passing through the first mounting hole and the two third mounting holes, a positioning pin installed in the first positioning pin mounting groove, the positioning pin cooperating with the first positioning groove, a first retaining ring installed in each of the two first retaining ring grooves, the two first retaining rings cooperating with the opposite surfaces of the two side plates, and the two end faces of the handle cooperating with the opposite surfaces of the two side plates.

6. The lever-type speed reducer for railway tunnel protective doors as described in claim 4, characterized in that, One end of the handle is fixedly mounted with a sleeve. A second mounting hole is provided along the middle of the sleeve. A second positioning groove is provided on the inner wall of the second mounting hole. A second positioning pin mounting groove is provided on the outer wall of the second mounting part away from the first mounting part. A second retaining ring groove is provided at the connection between the third mounting part and the second mounting part. The second mounting part passes through the second mounting hole. A positioning pin is installed in the second positioning pin mounting groove. The positioning pin cooperates with the second positioning groove. A second retaining ring is installed in the second retaining ring groove. The two end faces of the sleeve cooperate with one end face of the first mounting part and the second retaining ring, respectively.

7. The lever-type speed reducer for railway tunnel protective doors as described in claim 6, characterized in that, The handle is vertically and fixedly connected to the outer wall of the sleeve at the end away from the first mounting part.

8. The lever-type speed reducer for railway tunnel protective doors as described in claim 1, characterized in that, The two ends of the handle are rotatably connected to the ends of the first connecting rod and the second connecting rod respectively via a first pin. The end of the first connecting rod is rotatably connected to the end of the first locking rod via a second pin. The end of the second connecting rod is rotatably connected to the end of the second locking rod via a third pin.

9. The lever-type speed reducer for railway tunnel protective doors as described in claim 1, characterized in that, A first limiting groove is provided on the outer wall of the first locking rod along the extension direction of the first locking rod. A first wing plate is provided on the outer wall of one end of the first sleeve. Two third bolt holes are provided on the first wing plate. The third bolt holes are fixedly connected to the inner frame of the protective door by third bolts. A first ball bushing is fixedly installed on the end of the first sleeve away from the first wing plate. The first ball bushing is slidably connected to the first locking rod. A first limiting rod is threadedly connected to the outer wall of the first sleeve. The end of the first limiting rod is slidably connected to the first limiting groove.

10. The lever-type speed reducer for railway tunnel protective doors as described in claim 9, characterized in that, The outer wall of the second locking rod is provided with a second limiting groove along the extension direction of the second locking rod. The outer wall of one end of the second sleeve is provided with a second wing plate. The second wing plate is provided with two fourth bolt holes. The fourth bolt holes are fixedly connected to the inner frame of the protective door by fourth bolts. The end of the second sleeve away from the second wing plate is fixedly installed with a second ball bushing. The second ball bushing is slidably connected to the second locking rod. The outer wall of the second sleeve is threaded with a second limiting rod. The end of the second limiting rod is slidably connected to the second limiting groove.

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