High-low speed gear shifting lifting mechanism for tunnel lining vault grouting

Abstract

The utility model discloses a high-low speed gear shifting lifting mechanism for tunnel lining vault grouting, which comprises a supporting main frame and a gear shifting screw rod lifting mechanism, and the gear shifting screw rod lifting mechanism comprises a main lifting speed reducer motor, a gear transmission assembly, a speed regulating and gear shifting assembly and a main lifting trapezoid screw rod. The gear transmission assembly comprises a gear box, a driven shaft, a driving shaft, a driven gear set and a driving gear set, the driven shaft and the driving shaft are transversely arranged at intervals up and down, the driven gear set comprises a driven large gear and a driven small gear, the driving gear set comprises a driving small gear and a driving large gear, and a transmission main gear is arranged at the right end, extending out of the gear box, of the driven shaft; an auxiliary gear meshed with the transmission main gear is arranged close to the top end of the main elevator-shaped screw rod; the speed regulating and gear shifting assembly comprises a speed regulating box, a gear shifting speed reducer motor and a movable rack, a shifting fork is arranged at the right end of the movable rack, and the device has the advantages of automatic control, rapid high and low speed gear shifting, ingenious design conception, avoidance of tunnel vault disengagement hidden danger, interlocking design structures and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of gear shifting and lifting, and in particular relates to a high- and low-speed gear shifting and lifting mechanism for tunnel lining arch grouting. Background Art

[0002] After the pouring of lining concrete is completed, the grouting pipe of the tunnel lining vault needs to be relatively quickly separated from the lining formwork to make the volume of the concrete slurry poured during the withdrawal and the gap left after the grouting pipe is withdrawn as consistent as possible. However, the grouting pipe lifting mechanism for the tunnel vault currently lacks the high and low speed shifting function, resulting in the grouting pipe being inserted into or separated from the tunnel vault pouring area and rising and falling at a uniform speed. In the case of a large amount of grouting, if the grouting pipe descends too slowly, the concrete extrusion causes the pouring pressure of the vault to increase instantly, resulting in the collapse of the tunnel lining vault in the later stage or the occurrence of voids during the later connection. The voids are due to the thermal expansion and contraction of the air, which can cause cracks in the lining concrete in severe cases, leading to water leakage on the top of the tunnel, posing a safety hazard to the subsequent tunnel construction. Summary of the invention

[0003] The utility model aims to provide a high- and low-speed shifting lifting mechanism for tunnel lining vault grouting. The high- and low-speed lifting and lowering have automatic shifting and are easy to operate. The utility model solves the problem that the current grouting pipe descends too slowly, and the internal pressure of the vault increases instantly due to concrete extrusion, resulting in the collapse of the tunnel lining vault in the later stage or the occurrence of emptying during the later connection.

[0004] To this end, the technical solution adopted by the utility model is: a high-low speed shifting lifting mechanism for tunnel lining vault grouting, including a supporting main frame and a shifting screw lifting mechanism installed on the supporting main frame, the shifting screw lifting mechanism includes a main lifting reducer motor, a gear transmission assembly, a speed shifting assembly and a main lifting trapezoidal screw, the gear transmission assembly includes a gear box installed on the supporting main frame, a driven shaft and a driving shaft all located in the gear box, a driven gear set installed at both ends of the driven shaft, and a driving gear set installed on the driving shaft, the driven shaft and the driving shaft are arranged laterally with an interval up and down, and both ends are rotatably installed in the gear box through a bearing seat, the driven gear set includes a driven large gear near the left end and a driven small gear near the right end, the driving gear set includes a driving small gear and a driving large gear fixedly connected on the left and right sides, and the driven gear set includes a driven small gear and a driving large gear fixedly connected on the left and right sides. The right end of the shaft extending out of the gear box is provided with a transmission main gear, and the upper and lower ends of the main lifting trapezoidal screw rod are rotatably mounted on the supporting main frame through bearing seats. The main lifting trapezoidal screw rod is provided with a sub-gear meshing with the transmission main gear near the top, and the main lifting trapezoidal screw rod is equipped with a screw nut connected to the grouting pipe, thereby realizing the lifting and lowering of the grouting pipe; the speed regulation and shifting assembly includes a speed regulating box installed on the front side of the gear box, a shift reducer motor installed on the speed regulating box, and a movable rack located in the speed regulating box, the movable rack is meshed with the gear at the output end of the shift reducer motor, and the right end of the movable rack is provided with a shift fork extending horizontally backward and clamping the active large gear. When the output shaft of the shift reducer motor rotates, it drives the movable rack to move horizontally left and right, and drives the active gear set to move left and right alternately through the shift fork to mesh with the upper and lower large and small gears, thereby realizing high and low speed shifting.

[0005] As a preferred embodiment of the above scheme, the supporting main frame includes a base frame, an "I"-shaped main frame and a top cover which are sequentially erected from bottom to top. The left groove of the "I"-shaped main frame is provided with a horizontal support plate for installing the gear box, and the middle cross plate is correspondingly provided with a notch for the transmission main gear to pass through. The design structure is reasonable and the installation is stable.

[0006] Further preferably, the left end of the movable rack is provided with an explosion-proof travel switch lever which extends horizontally forward and protrudes out of the speed regulating box, the front plate of the speed regulating box is provided with a strip limit opening for the explosion-proof travel switch lever to extend, and explosion-proof travel switches are installed on the left and right parts corresponding to the strip limit opening, and the rear plate of the speed regulating box is provided with an opening for the shift fork to extend and move horizontally, when the explosion-proof travel switch lever moves left and right along the strip limit opening to exceed the safe activity range and toggles the explosion-proof travel switch, the system controls the motor main lifting reducer motor to stop, thereby ensuring safe operation and reasonable design.

[0007] Further preferably, the length of the strip-shaped limit opening is greater than the movable distance of the shift fork driving the upper and lower large and small gears of the driving gear set to engage with each other, thereby effectively avoiding obstruction of the movement of the shift fork and having a reasonable design size.

[0008] It is further preferred that the driving shaft adopts a spline shaft, and there is resistance when the driving large gear moves left and right, which prevents it from moving easily and ensures the gear meshing effect, which is a reasonable choice.

[0009] Further preferably, the driving shaft is closely attached to the right side of the driving gear and is provided with a stop washer and a nut in sequence to the right, so as to ensure the movement resistance of the driving gear and prevent it from moving easily, thereby ensuring the gear meshing effect and having a reasonable design structure.

[0010] Further preferably, anti-collision pads are provided on the inner sides of the bearing seats at the left and right ends of the driving shaft to prevent collision of components, and the design structure is reasonable.

[0011] Further preferably, the transmission main gear and auxiliary gear are both bevel gears, and the spatial layout is reasonable.

[0012] Beneficial effects of the utility model:

[0013] (1) Compared with the current grouting pipe lifting mechanism for tunnel vaults, which lacks high-speed and low-speed shifting functions, this scheme adopts a shifting screw lifting mechanism to achieve high-speed and low-speed shifting functions. When the grouting pipe rises and enters the tunnel lining, it adopts a low speed. When the grouting pipe is pulled out of the tunnel lining, the shift reducer motor starts and shifts to a high speed that is ten times faster than the low speed. The movable rack is driven to move left and right through gear meshing. Finally, the driving gear set is driven to move left and right in turn through the shift fork until the driving pinion is meshed with the driven large gear, thereby realizing low-speed shifting to high speed for rapid descent of the grouting pipe. When the driving pinion is meshed with the driven large gear, low-speed movement is achieved. When the driving large gear is meshed with the driven pinion, high-speed movement is achieved. Automatic control and fast shifting are achieved.

[0014] (2) It can effectively ensure that the grouting pipe is detached from the lining formwork at a relatively high speed, so that the volume of concrete slurry poured during the withdrawal is as consistent as possible with the gap left after the grouting pipe is withdrawn. The desired descent speed can also be achieved by adjusting the large and small gear ratios, thereby ensuring that when the grouting pipe begins to descend, the concrete is fully filled and the pouring quality is good. The design concept is ingenious, effectively avoiding the collapse of the tunnel lining vault in the later stage or the occurrence of emptying during the later connection, eliminating safety hazards, and the design structure is closely linked.

[0015] In summary, it has the advantages of automatic control, fast high and low speed shifting, ingenious design, elimination of hidden dangers of tunnel vault collapse, and interlocking design structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a cross-sectional view of the shift screw lifting mechanism.

[0018] Figure 3 It is a schematic diagram of the structure of the speed control and shifting assembly (the rear side plate of the speed control box is not shown).

[0019] Figure 4 for Figure 3 Another perspective structural diagram of . DETAILED DESCRIPTION

[0020] The present invention will be further described below by way of embodiments and in conjunction with the accompanying drawings:

[0021] Combination Figure 1 — Figure 4 As shown, a high-low speed gear shifting lifting mechanism for tunnel lining vault grouting is composed of a supporting main frame 1 and a gear shifting screw lifting mechanism 2 installed on the supporting main frame 1.

[0022] The supporting main frame 1 is composed of a base frame 13, an I-shaped main frame 14 and a top cover 15 which are sequentially erected from bottom to top.

[0023] The shift screw lifting mechanism 2 is composed of a main lifting reducer motor 21 , a gear transmission assembly 22 , a speed regulating shift assembly 23 and a main lifting trapezoidal screw 24 .

[0024] The main lifting trapezoidal screw rod 24 is equipped with a screw rod nut 242 connected to the grouting pipe, thereby realizing the lifting and lowering of the grouting pipe.

[0025] The gear transmission assembly 22 is composed of a gear box 221 installed on the supporting main frame 1, a driven shaft 222 located in the gear box 221, a driving shaft 223, a driven gear set installed at both ends of the driven shaft 222, and a driving gear set installed on the driving shaft 223.

[0026] The driven shaft 222 and the driving shaft 223 are arranged horizontally with an interval up and down, and both ends are rotatably mounted in the gear box 221 through bearing seats.

[0027] The driven gear set is composed of a driven large gear 224 near the left end and a driven small gear 225 near the right end.

[0028] The driving gear set is composed of a driving pinion 226 and a driving gear 227 which are fixedly connected to each other.

[0029] The driving shaft 223 is a spline shaft.

[0030] The driving shaft 223 is close to the right side of the driving gear 227 and is provided with a stop washer 228 and a nut in sequence to the right.

[0031] Anti-collision pads are provided on the inner sides of the bearing seats at the left and right ends of the driving shaft 223.

[0032] A main transmission gear 229 is disposed at the right end of the driven shaft 222 extending out of the gear box 221 .

[0033] On the left side notch of the "I"-shaped main frame 14, there is a horizontal support plate 16 for installing the gearbox 221, and a notch for the driving main gear 229 to pass through is correspondingly provided on the middle cross plate.

[0034] Both the upper and lower ends of the main lifting trapezoidal lead screw 24 are rotatably installed on the support main frame 1 through bearing seats respectively.

[0035] Near the top of the main lifting trapezoidal lead screw 24, there is a sub-gear 241 meshing with the driving main gear 229, so as to realize the lifting of the lead screw nut of the main lifting trapezoidal lead screw 24.

[0036] The driving main gear 229 and the sub-gear 241 are preferably bevel gears.

[0037] The speed regulation and gear shifting assembly 23 is composed of a speed regulation box 231 installed on the front side of the gearbox 221, a gear shifting reduction motor 232 installed on the speed regulation box 231, and a movable rack 233 located inside the speed regulation box 231.

[0038] The movable rack 233 meshes with the gear at the output end of the gear shifting reduction motor 232.

[0039] At the right end of the movable rack 233, there is a fork 235 extending horizontally backward and clamping the driving large gear 227.

[0040] On the rear plate of the speed regulation box 231, there is an opening for the fork 235 to extend and move horizontally.

[0041] At the left end of the movable rack 233, there is an explosion-proof travel switch lever 234 extending horizontally forward and protruding out of the speed regulation box 231.

[0042] On the front plate of the speed regulation box 231, there is a strip-shaped limiting opening 231a for the explosion-proof travel switch lever 234 to extend out, and explosion-proof travel switches 236 are installed corresponding to the left and right parts of the strip-shaped limiting opening 231a.

[0043] When the explosion-proof travel switch lever 234 moves left and right along the strip-shaped limiting opening 231a and exceeds the safe movement range to toggle the explosion-proof travel switch 236, the system controls the main lifting reduction motor 21 of the motor to stop.

[0044] The length of the strip-shaped limiting opening 231a is greater than the movement distance of the fork 235 driving the upper and lower large and small gears of the driving gear set to mesh.

[0045] When the output shaft of the gear shifting reduction motor 232 rotates, it drives the movable rack 233 to move horizontally left and right, and drives the driving gear set to move left and right alternately through the fork 235 until the upper and lower large and small gears mesh, so as to realize high and low speed gear shifting.

Claims

1. A high-low speed shifting lifting mechanism for tunnel lining vault grouting, characterized in that: The invention comprises a supporting main frame (1) and a gear shift screw lifting mechanism (2) installed on the supporting main frame (1), wherein the gear shift screw lifting mechanism (2) comprises a main lifting reducer motor (21), a gear transmission assembly (22), a speed regulating gear shift assembly (23) and a main lifting trapezoidal screw (24), wherein the gear transmission assembly (22) comprises a gear box (221) installed on the supporting main frame (1), a driven shaft (222) both located in the gear box (221), a driving shaft (223), a driven gear set installed at both ends of the driven shaft (222), and a gear transmission assembly (23). The driving gear set is mounted on the driving shaft (223), the driven shaft (222) and the driving shaft (223) are arranged horizontally with an interval up and down, and both ends are rotatably mounted in the gear box (221) through a bearing seat, the driven gear set includes a driven large gear (224) near the left end and a driven small gear (225) near the right end, the driving gear set includes a driving small gear (226) and a driving large gear (227) fixedly connected on the left and right, and the right end of the driven shaft (222) extending out of the gear box (221) is provided with a transmission main gear (229 ), the upper and lower ends of the main lifting trapezoidal screw rod (24) are rotatably mounted on the supporting main frame (1) through bearing seats, and the main lifting trapezoidal screw rod (24) is provided with a secondary gear (241) meshing with the transmission main gear (229) near the top, and the main lifting trapezoidal screw rod (24) is equipped with a screw nut (242) connected to the grouting pipe, so as to realize the lifting and lowering of the grouting pipe; the speed regulating and shifting assembly (23) includes a speed regulating box (231) mounted on the front side of the gear box (221), a shifting reducer motor mounted on the speed regulating box (231), and a gear shifting reducer motor mounted on the gear box (231). The movable rack (233) is meshed with a gear at the output end of the gear-shifting reducer motor (232); a shift fork (235) extending horizontally backward and clamping the driving large gear (227) is provided at the right end of the movable rack (233); when the output shaft of the gear-shifting reducer motor (232) rotates, the movable rack (233) is driven to move horizontally left and right, and the driving gear set is driven to move left and right alternately through the shift fork (235) to mesh with the upper and lower large and small gears, thereby realizing high and low speed shifting.

2. A high-low speed shifting lifting mechanism for tunnel lining vault grouting according to claim 1, characterized in that: The supporting main frame (1) comprises a base frame (11), an I-shaped main frame (12) and a top cover (13) which are sequentially erected from bottom to top; a horizontal support plate (16) for mounting a gear box (221) is provided at a left notch of the I-shaped main frame (12), and a notch for a transmission main gear (229) to pass through is correspondingly provided on the middle transverse plate.

3. A high-low speed shifting lifting mechanism for tunnel lining vault grouting according to claim 1, characterized in that: The left end of the movable rack (233) is provided with an explosion-proof travel switch lever (234) extending horizontally forward and extending out of the speed regulating box (231); the front plate of the speed regulating box (231) is provided with a strip-shaped limit opening (231a) for the explosion-proof travel switch lever (234) to extend out, and explosion-proof travel switches (236) are installed on the left and right parts corresponding to the strip-shaped limit opening (231a); the rear plate of the speed regulating box (231) is provided with an opening for the shift fork (235) to extend and move horizontally; when the explosion-proof travel switch lever (234) moves left and right along the strip-shaped limit opening (231a) to exceed the safe range of movement and toggles the explosion-proof travel switch (236), the system controls the motor main lifting reducer motor (21) to stop.

4. A high-low speed shifting lifting mechanism for tunnel lining vault grouting according to claim 3, characterized in that: The length of the strip-shaped limiting opening (231a) is greater than the movable distance of the shift fork (235) driving the upper and lower large and small gears of the driving gear set to mesh.

5. The high-low speed shifting lifting mechanism for tunnel lining vault grouting according to claim 1 is characterized in that: The driving shaft (223) is a spline shaft.

6. A high-low speed shifting lifting mechanism for tunnel lining vault grouting according to claim 5, characterized in that: The driving shaft (223) is closely attached to the right side of the driving gear (227) and is provided with a stop washer (228) and a nut in sequence to the right.

7. The high-low speed shifting lifting mechanism for tunnel lining vault grouting according to claim 1 is characterized in that: Anti-collision pads are provided inside the bearing seats at the left and right ends of the driving shaft (223).

8. The high-low speed shifting lifting mechanism for tunnel lining vault grouting according to claim 1 is characterized in that: The transmission main gear (229) and the auxiliary gear (241) are both bevel gears.

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