A tunnel construction protection device

Abstract

The present invention belongs to the technical field of tunnel construction, and specifically refers to a tunnel construction protection device, which includes a base, a side protection component, a top protection component, and a lifting component. By setting the top protection component in the present invention, multiple first top support plates and second top support plates are arranged annularly to provide effective protection for the staff located below the top protection component. The staff can adjust the positions of the first top support plates and the second top support plates through the control screen. The switching motor can drive the switching gear to rotate, and drive the control cam to rotate through the rotating teeth. The bumps on the control cam can drive the first sliding rod and the second sliding rod to slide in the sliding holes, thereby driving the first top support plates and the second top support plates to rise or fall, so as to achieve the technical effect of adapting to tunnels of different size specifications.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel construction, and specifically refers to a tunnel construction protection device. Background Art

[0002] Tunnel construction is a complex and delicate engineering activity, which involves multiple links such as geological exploration, excavation, support, and lining. Construction workers are in a high-risk environment and need to use protection devices to ensure their safety.

[0003] A Chinese patent with the publication number CN110307023A discloses a convenient-to-use protection device for tunnel construction. Rollers are provided on the lower wall of the large base, facilitating movement. The arc-shaped support plate can protect the upper part of the tunnel to prevent falling rocks from hitting the staff. The arc-shaped support plate can slide back and forth through the first concave rod, the second concave rod, and the third concave rod, thereby adjusting the protection position of the arc-shaped support plate. The staff can control the rotation of the large rotating plate by moving the lever and the large pin rod downward, and then move the arc-shaped support plate away from the top of the tunnel. At this time, it is more convenient for the staff to construct the top of the tunnel. It has flexible adjustment and good protection effect, which is beneficial for the staff to carry out construction. However, the size of the arc-shaped support plate cannot be flexibly changed, so it cannot be applied to tunnels of various size specifications.

[0004] Therefore, it is necessary to propose a tunnel construction protection device to solve the problems that occur in the existing tunnel construction protection work. Summary of the Invention

[0005] To solve the above existing problems, the present invention provides a tunnel construction protection device, which is provided with a top protection component. A plurality of first top support plates and second top support plates are arranged annularly to provide effective protection for the staff located below the top protection component. The staff can adjust the positions of the first top support plate and the second top support plate through the control screen. The switching motor can drive the switching gear to rotate, and drive the control cam to rotate through the rotating teeth. The convex blocks on the control cam can drive the first sliding rod and the second sliding rod to slide in the sliding holes, thereby driving the first top support plate and the second top support plate to rise or fall, so as to achieve the technical effect of adapting to tunnels of different size specifications.

[0006] The technical solution adopted by the present invention is as follows: This solution provides a tunnel construction protection device, including a base. Fixed support rods are respectively provided at the four corners of the upper wall of the base. An upper lead screw and an upper sliding rod are respectively connected between the upper ends of the front and rear opposite fixed support rods. Side protection components are symmetrically slidably arranged on the upper lead screw and the upper sliding rod. A top protection component is movably arranged above the symmetric side protection components. A lower lead screw and a lower sliding rod are respectively connected between the lower ends of the front and rear opposite fixed support rods. A lifting component is slidably arranged between the lower lead screw and the lower sliding rod. The lifting component is slidably arranged on the upper wall of the base. The top protection component includes a main support ring, a sub-support ring, a control cam, a first top support plate, and a second top support plate. The main support ring is symmetrically arranged in the front and rear above the side protection components. The sub-support rings are symmetrically and fixedly arranged on the front and rear side walls of the main support ring. The sub-support rings are arranged below the main support ring. The control cam is rotatably engaged between the sub-support rings. A sliding hole is penetrated through the upper wall of the main support ring in a circular array. A first sliding rod and a second sliding rod are respectively penetrated and slidably arranged in the sliding hole. The first sliding rod and the second sliding rod are arranged at intervals. The first top support plate is arranged at the upper end of the first sliding rod. The second top support plate is arranged at the upper end of the second sliding rod.

[0007] Further, the centers of the sub-support ring and the main support ring coincide. The number of the sliding holes is five. The number of the first sliding rods is three. The number of the second sliding rods is two. The first top support plate and the second top support plate are respectively arranged in an arc shape. When the first top support plate and the second top support plate move to the uppermost position, the first top support plate and the second top support plate are combined into a semi-circular arc shape. A return spring is connected between the lower walls of the first top support plate and the second top support plate and the upper wall of the main support ring. The return springs are respectively arranged around the side walls of the first sliding rod and the second sliding rod.

[0008] Further, the control cam includes a cam ring and a convex block. The cam ring is rotatably arranged between the sub-support rings. The centers of the cam ring and the sub-support ring coincide. The convex blocks are arranged in a circular array on the upper wall of the cam ring. The convex blocks are arranged between the main support ring and the sub-support ring. The number of the convex blocks is five. Grooves are formed at intervals between the convex blocks. The depths of two of the grooves are greater than the depths of the other two grooves. The grooves with larger depths and the grooves with shallower depths are arranged at intervals. Sliding grooves are formed on the opposite side walls of the paired sub-support rings. Sliding arcs are symmetrically arranged on the front and rear side walls of the cam ring. The sliding arcs are respectively slidably engaged in the sliding grooves.

[0009] Further, the lower wall of the cam ring is provided with rotating teeth in an annular array, the lower wall of the auxiliary support ring is rotatably provided with a switching gear, the switching gear is respectively meshed with the rotating teeth, a synchronizing rod is connected between the center of the end faces of the switching gears, and a switching motor is provided at the rotating shaft of one of the switching gears, and the output end of the switching motor is connected to the rotating shaft of the switching gear.

[0010] Further, the side protection assembly includes support sliding rods, inner baffles, telescopic electric rods, a controller and side support plates. First sliding blocks are slidably provided in pairs on the upper lead screw and the upper sliding rod respectively, the first sliding blocks are threadedly connected to the upper lead screw, the support sliding rods are respectively fixed on the side walls of the first sliding blocks, the inner baffles are fixed between the front and rear opposite support sliding rods, connecting rods are connected in pairs up and down between the front and rear opposite support sliding rods, the connecting rods are arranged outside the inner baffles, the telescopic electric rods are fixed on the connecting rods, the controller is fixed on the outer side wall of the inner baffle, and the side support plates are fixed at the output ends of the telescopic electric rods.

[0011] Further, lifting electric rods are respectively provided at the upper ends of the support sliding rods, the output ends of the lifting electric rods are respectively connected to both ends of the main support ring, and a control screen is provided on the inner side wall of the inner baffle.

[0012] Further, the lifting assembly includes a bottom sliding plate, a scissor lifting bracket, a lifting platform and second sliding blocks. The bottom sliding plate is slidably arranged on the upper wall of the base, the second sliding blocks are symmetrically arranged on the left and right side walls of the bottom sliding plate, the second sliding blocks are respectively slidably sleeved on the side walls of the lower lead screw and the lower sliding rod, the second sliding blocks are threadedly connected to the lower lead screw, the scissor lifting bracket is arranged on the upper wall of the bottom sliding plate, and the lifting platform is arranged at the upper end of the scissor lifting bracket.

[0013] Further, a first motor is provided at the end of the upper lead screw, a second motor is provided at the end of the lower lead screw, the first motor and the second motor are fixed on the fixed support rod, and the output ends of the first motor and the second motor are respectively connected to the ends of the upper lead screw and the lower lead screw.

[0014] Further, a handrail is provided at one side edge of the upper wall of the lifting platform, a lifting electric rod is provided on the upper wall of the bottom sliding plate, the output end of the lifting electric rod is connected to the scissor lifting bracket, and a pair of moving crawler wheels are provided on the lower wall of the base.

[0015] Further, the first motor, the second motor, the moving crawler wheels, the lifting electric rods, the control screen, the telescopic electric rods, the switching motor and the lifting electric rod are respectively electrically connected to the controller.

[0016] Further, the controller adopts Siemens S7-1200.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] (1) The device is provided with a top protection component. A plurality of first top support plates and second top support plates are arranged annularly, providing effective protection for the staff located below the top protection component. The staff can adjust the positions of the first top support plates and the second top support plates through the control panel. The switching motor can drive the switching gear to rotate, and drive the control cam to rotate through the rotating teeth. The bumps on the control cam can drive the first sliding rod and the second sliding rod to slide in the sliding holes, thereby driving the first top support plates and the second top support plates to rise or fall, and further achieving the technical effect of adapting to tunnels of different size specifications.

[0019] (2) The groove depths between the bumps are arranged according to the rule of alternating between shallow and deep. When the cam ring rotates, the first sliding rod can enter the shallower grooves, while the second sliding rod can enter the deeper grooves, so that the second top support plate descends to a position lower than the first top support plate, realizing the folding of the first top support plates and the second top support plates, thereby reducing the overall size of the device and adapting to tunnel cross-sections of different size specifications. During the construction process, the height of the first top support plate can be adjusted to make the first top support plate touch the tunnel roof wall, thereby ensuring the stability of the tunnel roof wall during the construction process and preventing falling stones or collapse of the roof wall from causing harm to the staff.

[0020] (3) The device is provided with a side protection component. The telescopic electric rod can drive the side support plates to extend or retract towards both sides of the device. When constructing inside the tunnel, the side support plates can be controlled to touch the tunnel side walls, realizing the support function for the tunnel side walls, ensuring the stability of the tunnel side walls during the construction process, and preventing the collapse of the side walls from causing harm to the staff.

[0021] (4) The first motor can drive the upper lead screw to rotate, thereby controlling the first sliding block and the support slide rod to move back and forth, and further controlling the front and rear positions of the top protection component and the side protection component. During the actual construction process, the positions of the top protection component and the side protection component can be adjusted to facilitate the construction and inspection of the tunnel top by the construction personnel.

[0022] (5) The second motor can drive the lower lead screw to rotate, thereby driving the second sliding block and the bottom slide plate to move back and forth, and further controlling the front and rear positions of the lifting component. During the actual construction process, the staff can stand on the lifting platform, adjust the front and rear positions of the lifting component, and control the scissor lifting bracket to unfold through the lifting electric rod to realize the rise of the lifting platform, so that the staff can reach a higher construction position, further expanding the working range of the staff. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of a tunnel construction protection device proposed by the present invention in the state where the first top support plates and the second top support plates are unfolded;

[0024] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0025] Figure 3 a schematic structural view of a tunnel construction protection device proposed by the present invention in a folded state of a first top support plate and a second top support plate;

[0026] Figure 4 an exploded structural view of a tunnel construction protection device proposed by the present invention;

[0027] Figure 5 an exploded structural view of a top protection assembly;

[0028] Figure 6 an exploded structural view of a main support ring and a control cam;

[0029] Figure 7 a structural view of a side protection assembly with side support plates removed;

[0030] Figure 8 a structural view of a lifting assembly;

[0031] Figure 9 a schematic structural view of a tunnel construction protection device proposed by the present invention in a working state;

[0032] Figure 10 a side view of a first top support plate and a second top support plate in an unfolded state;

[0033] Figure 11 a side view of a first top support plate and a second top support plate in a folded state.

[0034] Wherein, 1. base, 11. fixed support rod, 12. upper lead screw, 121. first motor, 13. lower lead screw, 131. second motor, 14. upper sliding rod, 15. lower sliding rod, 16. moving crawler wheel, 2. side protection assembly, 21. support sliding rod, 211. first sliding block, 212. lifting electric rod, 213. connecting rod, 22. inner baffle, 221. control screen, 23. telescopic electric rod, 24. controller, 25. side support plate, 3. top protection assembly, 31. main support ring, 311. sliding hole, 32. auxiliary support ring, 321. sliding groove, 33. control cam, 331. cam ring, 332. convex block, 333. groove, 334. sliding arc, 335. rotating tooth, 34. first top support plate, 341. first sliding rod, 35. second top support plate, 351. second sliding rod, 36. switching gear, 361. switching motor, 362. synchronizing rod, 37. return spring, 4. lifting assembly, 41. bottom sliding plate, 411. lifting electric rod, 42. scissor lifting bracket, 43. lifting platform, 431. handrail, 44. second sliding block.

[0035] The accompanying drawings are used to provide a further understanding of the present invention and form a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. Detailed Description of the Specific Embodiments

[0036] In conjunction with the accompanying drawings, the present invention will be further described in detail.

[0037] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 shown, the present solution provides a tunnel construction protection device, including a base 1, side protection components 2, top protection components 3, and a lifting component 4. Fixed support rods 11 are respectively provided at the four corners of the upper wall of the base 1. An upper lead screw 12 and an upper slide bar 14 are respectively connected between the upper ends of the front and rear opposite fixed support rods 11. The side protection components 2 are symmetrically slidably arranged on the upper lead screw 12 and the upper slide bar 14. The top protection components 3 are movably arranged above the symmetric side protection components 2. A lower lead screw 13 and a lower slide bar 15 are respectively connected between the lower ends of the front and rear opposite fixed support rods 11. The lifting component 4 is slidably arranged between the lower lead screw 13 and the lower slide bar 15, and the lifting component 4 is slidably arranged on the upper wall of the base 1;

[0038] The end of the upper lead screw 12 is provided with a first motor 121, and the end of the lower lead screw 13 is provided with a second motor 131. The first motor 121 and the second motor 131 are fixedly arranged on the fixed support rod 11. The output ends of the first motor 121 and the second motor 131 are respectively connected to the ends of the upper lead screw 12 and the lower lead screw 13. Moving crawler wheels 16 are provided in pairs on the lower wall of the base 1.

[0039] The side protection component 2 includes support slide bars 21, inner baffles 22, telescopic electric rods 23, a controller 24, and side support plates 25. First sliding blocks 211 are respectively slidably arranged in pairs on the upper lead screw 12 and the upper slide bar 14. The first sliding blocks 211 are threadedly connected to the upper lead screw 12. The support slide bars 21 are respectively fixed on the side walls of the first sliding blocks 211. The inner baffles 22 are fixed between the front and rear opposite support slide bars 21. Link rods 213 are connected in pairs up and down between the front and rear opposite support slide bars 21. The link rods 213 are arranged outside the inner baffles 22. The telescopic electric rods 23 are fixed on the link rods 213. The controller 24 is fixed on the outer side wall of the inner baffle 22. The side support plates 25 are fixed on the output ends of the telescopic electric rods 23. Lifting electric rods 212 are respectively provided at the upper ends of the support slide bars 21. A control screen 221 is provided on the inner side wall of the inner baffle 22.

[0040] The top protection assembly 3 includes a main support ring 31, a secondary support ring 32, a control cam 33, a first top support plate 34, and a second top support plate 35. The main support ring 31 is symmetrically arranged above the lifting electric pole 212 in the front and back. The output ends of the lifting electric pole 212 are respectively connected to both ends of the main support ring 31. The secondary support ring 32 is symmetrically fixed on the front and back side walls of the main support ring 31. The secondary support ring 32 is arranged below the main support ring 31. The control cam 33 is rotatably engaged between the secondary support rings 32. A sliding hole 311 is provided through the upper wall of the main support ring 31 in a circular array. A first sliding rod 341 and a second sliding rod 351 are respectively slidably arranged through the sliding hole 311. The first sliding rod 341 and the second sliding rod 351 are arranged at intervals. The first top support plate 34 is arranged at the upper end of the first sliding rod 341, and the second top support plate 35 is arranged at the upper end of the second sliding rod 351;

[0041] The centers of the secondary support ring 32 and the main support ring 31 coincide. The number of sliding holes 311 is five. The number of first sliding rods 341 is three. The number of second sliding rods 351 is two. The first top support plate 34 and the second top support plate 35 are respectively arranged in an arc shape. When the first top support plate 34 and the second top support plate 35 move to the uppermost position, the first top support plate 34 and the second top support plate 35 are combined into a semi-circular arc shape; A return spring 37 is connected between the lower walls of the first top support plate 34 and the second top support plate 35 and the upper wall of the main support ring 31. The return springs 37 are respectively arranged around the side walls of the first sliding rod 341 and the second sliding rod 351.

[0042] The control cam 33 includes a cam ring 331 and a convex block 332. The cam ring 331 is rotatably arranged between the secondary support rings 32. The centers of the cam ring 331 and the secondary support ring 32 coincide. The convex blocks 332 are arranged in a circular array on the upper wall of the cam ring 331. The convex blocks 332 are arranged between the main support ring 31 and the secondary support ring 32. The number of convex blocks 332 is five. Grooves 333 are formed at intervals between the convex blocks 332. The depths of two of the grooves 333 are greater than the depths of the other two grooves 333. The grooves 333 with larger depths and the grooves 333 with shallower depths are arranged at intervals. Sliding grooves 321 are formed on the opposite side walls of the paired secondary support rings 32. Sliding arcs 334 are symmetrically arranged on the front and back side walls of the cam ring 331. The sliding arcs 334 are respectively slidably engaged in the sliding grooves 321;

[0043] Rotating teeth 335 are arranged in a circular array on the lower wall of the cam ring 331. A switching gear 36 is rotatably arranged on the lower wall of the secondary support ring 32. The switching gear 36 is respectively meshed with the rotating teeth 335. A synchronizing rod 362 is connected between the center points of the end faces of the switching gears 36. A switching motor 361 is arranged at the rotating shaft of one of the switching gears 36. The output end of the switching motor 361 is connected to the rotating shaft of the switching gear 36.

[0044] The lifting assembly 4 includes a bottom sliding plate 41, a scissor lifting bracket 42, a lifting platform 43, and a second sliding block 44. The bottom sliding plate 41 is slidably disposed on the upper wall of the base 1. The second sliding blocks 44 are symmetrically disposed on the left and right side walls of the bottom sliding plate 41. The second sliding blocks 44 are respectively slidably sleeved on the side walls of the lower lead screw 13 and the lower slide bar 15. The second sliding block 44 is threadedly connected to the lower lead screw 13. The scissor lifting bracket 42 is disposed on the upper wall of the bottom sliding plate 41. The lifting platform 43 is disposed at the upper end of the scissor lifting bracket 42. One side edge of the upper wall of the lifting platform 43 is provided with a handrail 431. The upper wall of the bottom sliding plate 41 is provided with a lifting electric rod 411. The output end of the lifting electric rod 411 is connected to the scissor lifting bracket 42.

[0045] The first motor 121, the second motor 131, the moving crawler wheels 16, the lifting electric rod 212, the control panel 221, the telescopic electric rod 23, the switching motor 361, and the lifting electric rod 411 are respectively electrically connected to the controller 24.

[0046] Working principle and working process:

[0047] The staff stands on the lifting assembly 4 or the base 1 and controls the operation of the moving crawler wheels 16 through the control panel 221, so as to control the movement of the base 1. The staff moves the whole device to the position in the tunnel where construction needs to be carried out, and adjusts the top protection assembly 3 and the side protection assembly 2 according to the internal dimensions of the tunnel;

[0048] A plurality of first top support plates 34 and second top support plates 35 are arranged annularly to provide effective protection for the staff located below the top protection assembly 3. The staff can adjust the positions of the first top support plates 34 and the second top support plates 35 through the control panel 221. The controller 24 issues a start command to the switching motor 361 according to the operation of the staff on the control panel 221. The switching motor 361 can drive the switching gear 36 to rotate, and drive the control cam 33 to rotate through the rotating teeth 335. The convex block 332 on the control cam 33 can drive the first sliding rod 341 and the second sliding rod 351 to slide in the sliding holes 311, so as to drive the first top support plate 34 and the second top support plate 35 to rise or fall;

[0049] The depths of the grooves 333 between the bumps 332 are arranged according to a pattern of alternating depths. When the cam ring 331 rotates, the first sliding rod 341 can enter the grooves 333 with shallower depths, while the second sliding rod 351 can enter the grooves 333 with deeper depths. As a result, the second top support plate 35 descends to a position lower than the first top support plate 34, achieving the folding of the first top support plate 34 and the second top support plate 35, thereby reducing the overall size of the device to adapt to tunnel cross-sections of different size specifications. At the same time, to ensure that the first top support plate 34 and the second top support plate 35 can move stably driven by the control cam 33, return springs 37 are respectively provided on the first sliding rod 341 and the second sliding rod 351. When the first sliding rod 341 and the second sliding rod 351 slide from the top of the bump 332 into the groove 333 respectively, the first top support plate 34 and the second top support plate 35 will move downward under the elastic action of the return spring 37, and the first sliding rod 341 and the second sliding rod 351 slide downward along the sliding holes 311, thus achieving the folding effect of the first top support plate 34 and the second top support plate 35;

[0050] During the construction process, by adjusting the height of the first top support plate 34, the first top support plate 34 can touch the top wall of the tunnel, thereby ensuring the stability of the top wall of the tunnel during the construction process and preventing damage to the staff caused by falling rocks or collapse of the top wall, as Figure 10 and Figure 11 shown; the staff can also control the lifting electric rod 212 through the control screen 221. The lifting electric rod 212 can drive the top protection component 3 to rise or fall as a whole, thereby adjusting the positions of the first top support plate 34 and the second top support plate 35, and further adapting to the top walls of tunnels at different heights.

[0051] The device is provided with side protection components 2. The telescopic electric rod 23 can drive the side support plates 25 to extend or retract towards both sides of the device. During the construction inside the tunnel, by controlling the side support plates 25 to touch the side walls of the tunnel, the supporting function for the side walls of the tunnel can be realized, ensuring the stability of the side walls of the tunnel during the construction process and preventing damage to the staff caused by the collapse of the side walls.

[0052] The first motor 121 can drive the upper lead screw 12 to rotate, thereby controlling the front-back movement of the first sliding block 211 and the support slide rod 21, and further controlling the front-back positions of the top protection component 3 and the side protection components 2. During the actual construction process, by adjusting the positions of the top protection component 3 and the side protection components 2, it is convenient for the construction staff to construct and inspect the top of the tunnel;

[0053] The second motor 131 can drive the lower lead screw 13 to rotate, thereby driving the second sliding block 44 and the bottom slide plate 41 to move back and forth, and further controlling the front and rear positions of the lifting assembly 4. During actual construction, the staff can stand on the lifting platform 43 to adjust the front and rear positions of the lifting assembly 4, and control the scissor lifting bracket 42 to expand through the lifting pole 411 to achieve the rise of the lifting platform 43, so that the staff can reach a higher construction position, further expanding the working range of the staff.

[0054] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0055] The above describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention. The actual structure is not limited thereto. All in all, if those of ordinary skill in the art are inspired by it and without departing from the purpose of the present invention, without creative design, structures and embodiments similar to the technical solution should all fall within the protection scope of the present invention.

Claims

1. A tunnel construction protection device, comprising a base (1), characterized in that: At the four corners of the upper wall of the base (1), fixing support rods (11) are respectively provided. Between the upper ends of the front and rear opposite fixing support rods (11), an upper lead screw (12) and an upper sliding rod (14) are respectively connected. On the upper lead screw (12) and the upper sliding rod (14), side protection components (2) are symmetrically slidably arranged. Above the symmetric side protection components (2), a top protection component (3) is movably arranged. Between the lower ends of the front and rear opposite fixing support rods (11), a lower lead screw (13) and a lower sliding rod (15) are respectively connected. Between the lower lead screw (13) and the lower sliding rod (15), a lifting component (4) is slidably arranged. The lifting component (4) is slidably arranged on the upper wall of the base (1). The top protection component (3) includes a main support ring (31), a sub-support ring (32), a control cam (33), a first top support plate (34), and a second top support plate (35). The main support ring (31) is symmetrically arranged front and rear above the side protection component (2). The sub-support rings (32) are symmetrically and fixedly arranged on the front and rear side walls of the main support ring (31). The sub-support ring (32) is arranged below the main support ring (31). The control cam (33) is rotatably engaged between the sub-support rings (32). Through holes (311) are arranged in a circular array on the upper wall of the main support ring (31). A first sliding rod (341) and a second sliding rod (351) respectively penetrate and slide in the through holes (311). The first sliding rod (341) and the second sliding rod (351) are arranged at intervals. The first top support plate (34) is arranged at the upper end of the first sliding rod (341). The second top support plate (35) is arranged at the upper end of the second sliding rod (351). The control cam (33) includes a cam ring (331) and a convex block (332). The cam ring (331) is rotatably arranged between the sub-support rings (32). The centers of the cam ring (331) and the sub-support ring (32) coincide. The convex blocks (332) are arranged in a circular array on the upper wall of the cam ring (331). The convex blocks (332) are arranged between the main support ring (31) and the sub-support ring (32). The number of the convex blocks (332) is five. Grooves (333) are formed at intervals between the convex blocks (332). The depths of two of the grooves (333) are greater than the depths of the other two grooves (333). The grooves (333) with larger depths and the grooves (333) with shallower depths are arranged at intervals. Sliding grooves (321) are formed on the opposite side walls of the paired sub-support rings (32). Sliding arcs (334) are symmetrically arranged on the front and rear side walls of the cam ring (331). The sliding arcs (334) are respectively engaged and slidably arranged in the sliding grooves (321).

2. The tunnel construction protection device according to claim 1, wherein: The centers of the secondary support ring (32) and the main support ring (31) coincide. The number of the sliding holes (311) is five, the number of the first sliding rods (341) is three, and the number of the second sliding rods (351) is two. The first top support plate (34) and the second top support plate (35) are respectively arc-shaped. When the first top support plate (34) and the second top support plate (35) move to the uppermost position, the first top support plate (34) and the second top support plate (35) are combined into a semi-circular arc; A return spring (37) is connected between the lower walls of the first top support plate (34) and the second top support plate (35) and the upper wall of the main support ring (31). The return springs (37) are respectively arranged around the side walls of the first sliding rod (341) and the second sliding rod (351).

3. A tunnel construction protection device according to claim 2, characterized in that: Rotating teeth (335) are annularly arranged on the lower wall of the cam ring (331). A switching gear (36) is rotatably arranged on the lower wall of the secondary support ring (32). The switching gear (36) is respectively meshed with the rotating teeth (335). A synchronizing rod (362) is connected between the center points of the end faces of the switching gears (36). A switching motor (361) is arranged at the rotating shaft of one of the switching gears (36). The output end of the switching motor (361) is connected to the rotating shaft of the switching gear (36).

4. A tunnel construction protection device according to claim 3, characterized in that: The side protection assembly (2) includes support sliding rods (21), inner baffles (22), telescopic electric rods (23), a controller (24) and side support plates (25). First sliding blocks (211) are slidably arranged in pairs on the upper lead screw (12) and the upper sliding rod (14). The first sliding blocks (211) are threadedly connected to the upper lead screw (12). The support sliding rods (21) are respectively fixed on the side walls of the first sliding blocks (211). The inner baffles (22) are fixed between the front and rear opposing support sliding rods (21). Connecting rods (213) are connected in pairs up and down between the front and rear opposing support sliding rods (21). The connecting rods (213) are arranged outside the inner baffles (22). The telescopic electric rods (23) are fixed on the connecting rods (213). The controller (24) is fixed on the outer side wall of the inner baffle (22). The side support plates (25) are fixed at the output ends of the telescopic electric rods (23).

5. The tunnel construction protection device according to claim 4, characterized in that: Lifting electric rods (212) are respectively arranged at the upper ends of the support sliding rods (21). The output ends of the lifting electric rods (212) are respectively connected to both ends of the main support ring (31). A control screen (221) is arranged on the inner side wall of the inner baffle (22).

6. The tunnel construction protection device according to claim 5, characterized in that: The lifting assembly (4) includes a bottom sliding plate (41), a scissor lifting bracket (42), a lifting platform (43) and a second sliding block (44). The bottom sliding plate (41) is slidably arranged on the upper wall of the base (1). The second sliding blocks (44) are symmetrically arranged on the left and right side walls of the bottom sliding plate (41). The second sliding blocks (44) are respectively slidably sleeved on the side walls of the lower lead screw (13) and the lower slide bar (15). The second sliding block (44) is threadedly connected to the lower lead screw (13). The scissor lifting bracket (42) is arranged on the upper wall of the bottom sliding plate (41). The lifting platform (43) is arranged at the upper end of the scissor lifting bracket (42).

7. The tunnel construction protection device according to claim 6, wherein: A first motor (121) is arranged at the end of the upper lead screw (12), and a second motor (131) is arranged at the end of the lower lead screw (13). The first motor (121) and the second motor (131) are fixedly arranged on the fixed support rod (11). The output ends of the first motor (121) and the second motor (131) are respectively connected to the ends of the upper lead screw (12) and the lower lead screw (13).

8. A tunnel construction protection device according to claim 7, characterized in that: A handrail (431) is arranged at one side edge of the upper wall of the lifting platform (43). A lifting electric rod (411) is arranged on the upper wall of the bottom sliding plate (41). The output end of the lifting electric rod (411) is connected to the scissor lifting bracket (42). A pair of moving crawler wheels (16) are arranged on the lower wall of the base (1).

9. The tunnel construction protection device according to claim 8, characterized in that: The first motor (121), the second motor (131), the moving crawler wheels (16), the lifting electric rod (212), the control screen (221), the telescopic electric rod (23), the switching motor (361) and the lifting electric rod (411) are respectively electrically connected to the controller (24).

Images