Gantry type in-hole stirring and conveying trolley

Abstract

The utility model discloses a portal type in-hole stirring and conveying trolley which comprises a trolley base body and two sets of stirring, conveying and dust removing systems arranged on two sets of trolley underframes on the two sides of the trolley base body. Each set of stirring, conveying, dust-removing and pumping system comprises a stirring and spraying device, a dust-removing and air-discharging device and an electric control cabinet. And the feeding end of the stirring and spraying device is connected with the in-hole powder supply device, so that the dry-mixed mortar enters the stirring and spraying device and is stirred to prepare to-be-sprayed concrete slurry, then the to-be-sprayed concrete slurry is temporarily stored, and the stored concrete slurry is pumped outwards according to the control of the electric control cabinet. The air inlet end of the dust removal air outlet device is connected with the stirring and spraying device so that dust generated in the stirring and spraying device can be sucked into the dust removal air outlet device for dust removal, and old air generated after dust removal can be discharged out of the tunnel. According to the novel conveying trolley, the wall faces on the two sides of a tunnel can be sprayed at the same time, the working efficiency is greatly improved, concrete slurry can be prepared in the tunnel and can be prepared at any time, continuous construction is achieved, and the project progress is accelerated.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, and in particular, to a gantry-type in-tunnel mixing and conveying trolley. Background Technology

[0002] Shotcrete is the most widely used support method in tunnels. Shotcrete support processes include dry shotcrete and wet shotcrete. Dry shotcrete involves transporting the raw materials to the underground work site, mixing the dry shotcrete material manually or semi-mechanically, and then spraying it onto the target surface using a dry shotcrete machine. Water is added at the spray gun at the end of the dry shotcrete machine. Dry shotcrete has many disadvantages, including low production capacity, high labor intensity, high rebound rate, high dust concentration, poor underground working environment, and low strength of the dry shotcrete. Wet shotcrete, on the other hand, involves preparing a fluid concrete slurry from cement, water, sand, gravel, admixtures, and fibers according to a predetermined mix ratio at a concrete mixing plant. This slurry is then transported to the site by concrete slurry transport equipment and pumped onto the target surface using a wet shotcrete machine or wet shotcrete trolley. Compared to dry shotcrete, wet shotcrete has many advantages, including high mechanization, high work efficiency, low rebound rate, better working environment, superior mechanical properties of the shotcrete, and significant overall economic and social benefits.

[0003] In existing technologies, concrete slurry preparation is generally carried out outside the tunnel and transported to the construction site inside the tunnel by concrete slurry transportation equipment. The concrete slurry is then pumped to the sprayed surface using a wet spraying machine or wet spraying trolley. Due to the confined space inside the tunnel, the passing and turning maneuvers of the concrete slurry trucks are particularly inconvenient, easily causing congestion inside the tunnel and leading to accidents. At the same time, the transfer process of concrete slurry is inefficient, making continuous construction impossible and affecting the project progress.

[0004] Existing patent 1CN 103850691 B discloses a shotcrete device for a full-face tunnel boring machine, which lacks an in-tunnel concrete preparation device and requires a tanker truck to transport the concrete slurry from outside the tunnel to the tunnel. Existing patent 2CN104818999 B discloses an integrated concrete spraying and coating tunnel construction device. Although this device has a mixer inside the tunnel, it still cannot prepare concrete on-site inside the tunnel. It can only perform secondary mixing of the concrete to prevent it from solidifying, and still requires a tanker truck for transportation. Existing patent 3CN 106426566 B discloses a slurry preparation device and method for a wet shotcrete mixing plant in a mine. This device has an excessively large mixing plant volume and occupies a large area, making it unsuitable for the confined environment inside a tunnel. Utility Model Content

[0005] This utility model provides a gantry-type in-tunnel mixing and conveying trolley to solve the technical problems of existing operation methods, such as inconvenience of tank truck passing and turning around, which easily leads to congestion in the tunnel space and causes accidents. At the same time, it makes the transfer process of concrete slurry inefficient, unable to achieve continuous construction, and affects the progress of the project.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A gantry-type tunnel mixing and conveying trolley includes: a trolley base arranged on the left and right sides at intervals and connected by a central crossbeam to form a gantry shape; and two sets of mixing, conveying, dust removal, and pumping systems mounted on two sets of trolley underframes on the left and right sides of the trolley base. Each mixing, conveying, dust removal, and pumping system includes a mixing spraying device and a dust removal and exhaust device, and an electrical control cabinet connecting the mixing spraying device and the dust removal and exhaust device to control their respective actions. The feed end of the mixing spraying device is connected to a powder supply device for supplying dry-mixed mortar inside the tunnel, so as to allow the dry-mixed mortar to enter and be mixed to prepare a concrete slurry to be sprayed, which is then temporarily stored. The stored concrete slurry is then pumped outward under the control of the electrical control cabinet. The air inlet of the dust removal and exhaust device is connected to the mixing spraying device, so as to draw in the dust generated in the mixing spraying device for dust removal and discharge the old air generated after dust removal to the outside of the tunnel.

[0008] Furthermore, the mixing and pumping device includes a mixing host for mixing dry-mixed mortar to prepare concrete slurry, a flexible screw conveyor for conveying dry-mixed mortar, and a discharge pump for outputting and spraying the concrete slurry. The flexible screw conveyor is flexibly configured, with its inlet end connected to a powder supply device and its outlet end connected to the mixing host for conveying the dry-mixed mortar to the mixing host. The inlet end of the discharge pump is connected to the outlet end of the mixing host for temporarily storing the prepared concrete slurry and spraying the concrete slurry outwards onto the tunnel wall as needed.

[0009] Furthermore, the mixing host includes a hollow host housing, a rotatable mixing blade supported in the inner cavity of the host housing, a mixing drive unit connected to the outside of the host housing, and a water supply device, wherein the mixing drive unit and the water supply device are respectively connected to the electrical control cabinet; the output end of the mixing drive unit is connected to the mixing blade at the corresponding position; and the outlet end of the water supply device is connected to the inner cavity of the host housing.

[0010] Furthermore, the stirring blade includes a mounting shaft rotatably supported on two opposite side walls inside the main unit housing, and spiral blades extending in a spiral shape along the length of the mounting shaft and arranged on the outer circle of the mounting shaft; the end of the mounting shaft is connected to the output shaft of the stirring drive; the spiral direction of the spiral blades is opposite to the rotation direction of the stirring blades.

[0011] Furthermore, the flexible screw conveyor includes a flexible conveying pipe with flexible arrangement, and a conveying drive component and a rigid conveying pipe connected to both ends of the flexible conveying pipe; the conveying drive component is connected to the electrical control cabinet; the rigid conveying pipe is used to insert into the powder supply device.

[0012] Furthermore, the flexible conveying pipe includes a hollow and flexibly configured flexible outer tube, and a flexible spiral extending and arranged in a spiral shape within the flexible outer tube; the rigid conveying pipe is a hollow and rigidly configured rigid outer tube, and both ends of the rigid outer tube are open; one end of the flexible spiral extends out of the flexible outer tube and connects to the output shaft of the conveying drive component, and the other end of the flexible spiral extends out of the flexible outer tube and extends axially into the rigid outer tube.

[0013] Furthermore, the discharge pump includes a hopper connected to the discharge end of the mixing host, a shotcrete machine for spraying concrete slurry outward, and a pumping system connected between the hopper and the shotcrete machine; the shotcrete machine and the pumping system are respectively connected to the electrical control cabinet.

[0014] Furthermore, the dust removal and air outlet device includes a dust collector for dust removal, an air inlet pipe connecting the dust collector and the mixing host, and an air outlet pipe connecting the air outlet end of the dust collector, with the air outlet pipe extending outside the tunnel.

[0015] Furthermore, each mixing, conveying, dust removal, and pumping system also includes support rollers mounted on the trolley base. These support rollers are used to support the ventilation ducts erected above the tunnel during the movement of the trolley base, in order to avoid interference between the ventilation ducts and the conveying trolley.

[0016] Furthermore, the trolley base includes a trolley base that is rolled on the ground and a frame supported on the trolley base; the mixing, conveying, dust removal, and pumping system is supported on the frame.

[0017] This utility model has the following beneficial effects:

[0018] Compared to traditional integrated trolley structures where all components are located on the subframe, resulting in low structural space utilization and a large amount of unused space on the frame, this utility model's gantry-type tunnel mixing and conveying trolley features a gantry-shaped trolley base. This facilitates personnel movement between the two trolley base frames and material transport, thus making more efficient use of the confined space within the tunnel. Furthermore, all components are integrated onto the trolley base frames on both sides of the trolley, and each side of the trolley base frame is equipped with a mixing, conveying, and dust removal pumping system. These two systems can operate simultaneously and independently, allowing for simultaneous cleaning of the tunnel walls as the trolley base moves forward. The spraying process greatly improves work efficiency. In this utility model, the conveying trolley incorporates a mixing and spraying device, allowing concrete slurry to be prepared inside the tunnel on demand. This significantly enhances spraying efficiency, enabling continuous construction and accelerating project progress. Furthermore, it reduces congestion within the tunnel, minimizing the risk of accidents. The integrated design of the two mixing, conveying, dust removal, and pumping systems results in a highly integrated and compact unit, better suited to the confined working environment of tunnels. Additionally, the dust removal and ventilation devices within each system absorb and remove high-dust gases generated during the mixing and spraying process, effectively reducing dust pollution.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the main structure of a gantry-type in-cavity mixing and conveying trolley according to a preferred embodiment of the present invention;

[0022] Figure 2 This is a side view of the preferred embodiment of the gantry-type in-cavity mixing and conveying trolley of this utility model;

[0023] Figure 3 yes Figure 1 Schematic diagram of a medium-flexible screw conveyor;

[0024] Figure 4 yes Figure 1 A cross-sectional front view of the mixing host.

[0025] Legend:

[0026] 1. Trolley base; 11. Intermediate crossbeam; 12. Trolley underframe; 121. Trolley base; 122. Frame;

[0027] 2. Mixing main unit; 21. Main unit housing; 22. Mixing blades; 23. Mixing drive unit; 24. Water supply device;

[0028] 3. Flexible screw conveyor; 31. Flexible conveying pipe; 32. Conveying drive component; 33. Rigid conveying pipe;

[0029] 41. Collection hopper; 42. Pumping system;

[0030] 51. Dust collector; 52. Air outlet duct;

[0031] 6. Electrical control cabinet;

[0032] 7. Support rollers. Detailed Implementation

[0033] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0034] Reference Figure 1 A preferred embodiment of this utility model provides a gantry-type tunnel mixing and conveying trolley, comprising: a trolley base 1 arranged on both sides at intervals and connected by a central crossbeam 11 to form a gantry shape, and two sets of mixing, conveying, dust removal, and pumping systems mounted on two sets of trolley underframes 12 on the left and right sides of the trolley base 1. Each mixing, conveying, dust removal, and pumping system includes a mixing spraying device and a dust removal exhaust device, and an electrical control cabinet 6 connecting the mixing spraying device and the dust removal exhaust device to control their respective operations. The feed end of the mixing spraying device is connected to a powder supply device for supplying dry-mixed mortar inside the tunnel, so that the dry-mixed mortar can enter and be mixed to prepare a concrete slurry to be sprayed, which is then temporarily stored. The stored concrete slurry is then pumped outward under the control of the electrical control cabinet 6. The air inlet end of the dust removal exhaust device is connected to the mixing spraying device, so that the dust generated in the mixing spraying device is sucked into it for dust removal and the old air generated after dust removal is discharged outward to the outside of the tunnel.

[0035] When the gantry-type tunnel mixing and conveying trolley of this utility model is in operation, firstly, the electrical control cabinet 6 sends a signal to start the mixing and spraying device. The dry mortar in the tunnel powder supply device enters the mixing and spraying device through the feed end of the mixing and spraying device, and is wet-mixed under the action of the mixing and spraying device to form concrete slurry. The prepared concrete slurry is temporarily stored in the mixing and spraying device, and according to the function of the electrical control cabinet 6, the stored concrete slurry can be automatically pumped to the spraying trolley to complete the preparation of concrete slurry and pre-spraying preparation. At the same time, the mixing and spraying device will generate a large amount of dust and form gas with a high dust content when it is working. This dust-containing gas is removed by the dust removal and exhaust device, and the remaining old air after dust removal is discharged to the outside of the tunnel.

[0036] Compared to traditional integrated trolley structures where all components are located on the subframe, resulting in low structural space utilization and a large amount of unused space on the frame, this utility model's gantry-type tunnel mixing and conveying trolley features a gantry-shaped trolley base 1. This facilitates personnel movement between the two sets of trolley base frames 12 and the transport of materials, thus making more efficient use of the limited space within the tunnel. Furthermore, all components are integrated onto the trolley base frames 12 on both sides of the trolley, and each of the two trolley base frames 12 is equipped with a mixing, conveying, and dust removal pumping system. These two systems can operate simultaneously and independently, allowing for simultaneous cleaning of both sides of the tunnel as the trolley base 1 moves forward. The concrete slurry is sprayed onto the tunnel walls, greatly improving work efficiency. The conveying trolley of this invention, with its mixing and spraying device, allows concrete slurry to be prepared inside the tunnel, ready for immediate use. This not only significantly improves the efficiency of the spraying process, enabling continuous construction and accelerating project progress, but also reduces congestion within the tunnel, effectively minimizing accidents. The integrated design of the two sets of mixing, conveying, dust removal, and pumping systems is highly integrated and compact, making them more suitable for the confined working environment inside tunnels. Furthermore, the dust removal and ventilation devices in each set of mixing, conveying, dust removal, and pumping systems can absorb and remove the high-dust gases generated during the operation of the mixing and spraying device, effectively reducing dust pollution.

[0037] Optionally, such as Figure 2 As shown, the mixing and pumping device includes a mixing host 2 for mixing dry-mixed mortar to prepare concrete slurry, a flexible screw conveyor 3 for conveying the dry-mixed mortar, and a discharge pump for outputting and spraying the concrete slurry. The flexible screw conveyor 3 is flexibly configured, with its inlet end connected to a powder supply device and its outlet end connected to the mixing host 2 to convey the dry-mixed mortar to the mixing host 2. The discharge pump's inlet end is connected to the outlet end of the mixing host 2, used to temporarily store the prepared concrete slurry, and to spray the concrete slurry outwards onto the tunnel wall as needed.

[0038] In this optional solution, such as Figure 4As shown, the mixing host 2 includes a hollow host housing 21, a stirring blade 22 rotatably supported within the cavity of the host housing 21, a stirring drive 23 connected to the outside of the host housing 21, and a water supply device 24. The stirring drive 23 and the water supply device 24 are respectively connected to the electrical control cabinet 6. The output end of the stirring drive 23 is connected to the stirring blade 22 at the corresponding position. The outlet end of the water supply device 24 is connected to the cavity of the host housing 21.

[0039] In this optional solution, since the material to be prepared is UHPC ultra-high performance concrete for construction, which has high strength, high viscosity and high mixing difficulty, ordinary mixers cannot fully mix it. In this new type of mixing host 2, the mixing drive component 23 adopts an industrial motor + industrial gearbox, which has a large output torque, which can effectively solve the problem of sudden increase in resistance after the UHPC material is fluidized, thereby ensuring normal and stable mixing of the host. At the same time, the host has flexibility, buffering and overload protection functions.

[0040] In this optional solution, such as Figure 4 As shown, the mixing blade 22 includes a mounting shaft rotatably supported on two opposite side walls within the inner cavity of the main housing 21, and spiral blades extending spirally along the length of the mounting shaft and arranged on its outer circumference. The end of the mounting shaft is connected to the output shaft of the mixing drive unit 23. The spiral direction of the spiral blades is opposite to the rotation direction of the mixing blade 22. In this invention, the unique reverse spiral mixing design of the mixing blade 22 can maximize the thorough and uniform mixing of the concrete slurry within the main housing 21, thereby improving the quality of the concrete slurry molding.

[0041] In this optional solution, such as Figure 3 As shown, the flexible screw conveyor 3 includes a flexible conveying pipe 31, and a conveying drive component 32 and a rigid conveying pipe 33 connected to both ends of the flexible conveying pipe 31. The conveying drive component 32 is connected to the electrical control cabinet 6. The rigid conveying pipe 33 is used to insert into the powder supply device. Compared with the rigid screws in the prior art whose cylinders are made of steel, which cannot be bent, occupy too much space during installation, and thus cannot effectively utilize the limited space in the tunnel, and are also heavy and inconvenient to install and maintain, the flexible screw conveyor 3 of this utility model has a flexible conveying pipe 31, which is small in size, light in weight, easy to move, convenient to install, and can be bent, thereby maximizing the utilization of the limited space in the tunnel without affecting the material conveying efficiency.

[0042] In specific embodiments of this optional solution, such as Figure 3As shown, the flexible conveying pipe 31 includes a hollow and flexible outer tube, and a flexible spiral extending spirally within the flexible outer tube. The flexible outer tube is made of reinforcing tubing, which is highly resilient and can be bent. The flexible spiral is a spiral without an internal mounting shaft, is lightweight, and can be bent along with the flexible outer tube. The rigid conveying pipe 33 is a hollow and rigid outer tube with openings at both ends to allow dry-mixed mortar to enter. One end of the flexible spiral extends out of the flexible outer tube and connects to the output shaft of the conveying drive unit 32, while the other end of the flexible spiral extends axially into the rigid outer tube.

[0043] Optionally, such as Figure 2 As shown, the discharge pump includes a hopper 41 connected to the discharge end of the mixing host 2, a shotcrete machine for spraying concrete slurry outwards, and a pumping system 42 connected between the hopper 41 and the shotcrete machine. The shotcrete machine and the pumping system 42 are respectively connected to the electrical control cabinet 6.

[0044] During operation, dry-mixed mortar is conveyed from the front-end powder supply device to the mixing host 2 by the flexible screw conveyor 3. At the same time, the electrical control cabinet 6 sends a signal to start the mixing host 2. After a period of mixing, the dry-mixed mortar is prepared into concrete slurry. At this time, under the control of the electrical control cabinet 6, the mixing host 2 starts unloading, and the prepared concrete slurry falls into the collection hopper 41 below, where it is collected for temporary storage. The collection hopper 41 contains a mixing shaft, which can agitate the concrete slurry inside to prevent it from solidifying. Subsequently, under the control of the electrical control cabinet 6, the pumping system 42 starts operating, pumping the concrete slurry in the collection hopper 41 to the front shotcrete machine to complete the subsequent shotcrete work.

[0045] Optionally, such as Figure 1 and Figure 2 As shown, the dust removal and exhaust device includes a dust collector 51 for dust removal, an inlet pipe connecting the dust collector 51 and the mixing host 2, and an outlet pipe 52 connecting the outlet end of the dust collector 51, extending to the outside of the tunnel. During operation, the mixing host 2 generates a large amount of dust, forming gas with a high dust content. This gas enters the dust collector 51 through the inlet pipe connected to the mixing host 2 for dust removal. After dust removal, the gas is transported to the air supply system ahead through the outlet pipe 52, and then delivered to the outside of the tunnel by the air supply system.

[0046] Optionally, such as Figure 2 As shown, each set of mixing, conveying, dust removal, and pumping system also includes a support roller 7 mounted on the trolley base 12. The support roller 7 is used to support the ventilation duct erected above the tunnel during the movement of the trolley base 1, so as to avoid interference between the ventilation duct and the conveying trolley.

[0047] Optionally, such as Figure 2As shown, the trolley base 12 includes a trolley base 121 that is rolled on the ground, and a frame 122 supported on the trolley base 121. The mixing, conveying, dust removal, and pumping system is supported on the frame 122.

[0048] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gantry-type in-cavity mixing and conveying trolley, characterized in that, include: A gantry-shaped trolley base (1) is set up with left and right sides spaced apart and connected by a middle crossbeam (11), and two sets of mixing, conveying and dust removal pumping systems are set on two sets of trolley base frames (12) on the left and right sides of the trolley base (1). Each mixing, conveying, dust removal, and pumping system includes a mixing spraying device and a dust removal and air outlet device, as well as an electrical control cabinet (6) that connects the mixing spraying device and the dust removal and air outlet device to control their respective actions. The feed end of the mixing spraying device is connected to the powder supply device inside the hole for supplying dry mortar, so as to allow the dry mortar to enter and mix the dry mortar to prepare the concrete slurry to be sprayed and then temporarily store it, so as to pump the stored concrete slurry out according to the control of the electrical control cabinet (6). The air inlet of the dust removal and exhaust device is connected to the mixing and spraying device to suck in the dust generated in the mixing and spraying device for dust removal and to discharge the old air generated after dust removal to the outside of the tunnel.

2. The gantry-type in-cavity mixing and conveying trolley according to claim 1, characterized in that, The mixing and pumping device includes a mixing host (2) for mixing dry mortar to prepare concrete slurry, a flexible screw conveyor (3) for conveying dry mortar, and a discharge pump for outputting concrete slurry and spraying it. The flexible screw conveyor (3) is flexibly configured, with its feed end connected to the powder supply device and its discharge end connected to the mixing host (2) to transport dry mortar to the mixing host (2). The feed end of the discharge pump is connected to the discharge end of the mixing host (2) for temporary storage of the prepared concrete slurry, and the concrete slurry is sprayed outward onto the tunnel wall as needed.

3. The gantry-type in-cavity mixing and conveying trolley according to claim 2, characterized in that, The mixing host (2) includes a hollow host housing (21), a stirring blade (22) rotatably supported in the inner cavity of the host housing (21), a stirring drive (23) connected to the outside of the host housing (21), and a water supply device (24), and the stirring drive (23) and the water supply device (24) are respectively connected to the electrical control cabinet (6); The output end of the stirring drive (23) is connected to the stirring blade (22) at the corresponding position; The water outlet of the water supply device (24) is connected to the inner cavity of the main unit housing (21).

4. The gantry-type in-cavity mixing and conveying trolley according to claim 3, characterized in that, The stirring blade (22) includes a mounting shaft rotatably supported on two opposite side walls in the inner cavity of the main unit housing (21), and spiral blades extending in a spiral shape along the length of the mounting shaft and arranged on the outer circle of the mounting shaft. The end of the rotating shaft is connected to the output shaft of the stirring drive (23); The direction of rotation of the helical blades is opposite to that of the rotation of the stirring blades (22).

5. The gantry-type in-tunnel mixing and conveying trolley according to claim 2, characterized in that, The flexible screw conveyor (3) includes a flexible conveying pipe (31) that is flexibly arranged, and a conveying drive (32) and a rigid conveying pipe (33) connected to both ends of the flexible conveying pipe (31); The conveyor drive unit (32) is connected to the electrical control cabinet (6); A rigid conveying pipe (33) is used to insert into the powder supply device.

6. The gantry-type in-cavity mixing and conveying trolley according to claim 5, characterized in that, The flexible conveying pipe (31) includes a hollow and flexibly arranged flexible outer pipe, and a flexible spiral extending and arranged in a spiral shape inside the flexible outer pipe; The rigid conveying pipe (33) is a hollow and rigidly set rigid outer pipe, and both ends of the rigid outer pipe are set open; One end of the flexible spiral extends out of the flexible outer tube and connects to the output shaft of the conveying drive (32), while the other end of the flexible spiral extends out of the flexible outer tube and extends axially into the rigid outer tube.

7. The gantry-type in-cavity mixing and conveying trolley according to claim 2, characterized in that, The discharge pump includes a hopper (41) connected to the discharge end of the mixing host (2), a shotcrete machine for spraying concrete slurry outward, and a pumping system (42) connected between the hopper (41) and the shotcrete machine. The shotcrete machine and the pumping system (42) are respectively connected to the electrical control cabinet (6).

8. The gantry-type in-cavity mixing and conveying trolley according to claim 2, characterized in that, The dust removal and air outlet device includes a dust collector (51) for dust removal, an air inlet pipe connecting the dust collector (51) and the mixing host (2), and an air outlet pipe (52) connecting the air outlet end of the dust collector (51). The air outlet pipe (52) extends to the outside of the tunnel.

9. The gantry-type in-cavity mixing and conveying trolley according to claim 1, characterized in that, Each mixing, conveying, dust removal, and pumping system also includes a support roller (7) mounted on the trolley base frame (12). The support roller (7) is used to support the ventilation duct erected above the tunnel during the movement of the trolley base (1) to avoid interference between the ventilation duct and the conveying trolley.

10. The gantry-type in-cavity mixing and conveying trolley according to claim 1, characterized in that, The trolley base (12) includes a trolley base (121) that is rolled on the ground, and a trolley frame (122) supported on the trolley base (121); The mixing, conveying, dust removal, and pumping system is mounted on the chassis (122).

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