Shaftless screw conveyor and tunneling equipment with same

Abstract

The utility model provides a shaftless screw conveyer and tunneling equipment with the shaftless screw conveyer. The shaftless screw conveyor comprises a cylinder body, a blade and a gate, wherein a conveying channel is formed in the cylinder body. The blades are at least partially arranged in the cylinder body and are driven by the rotary driving device to rotate; the blades are shaftless blades spirally extending in the axial direction of the barrel, and cutting parts are arranged on the radial outer sides of at least one part, located in the barrel, of the blades. The gate is arranged on the downstream of the blade in the conveying direction and can be opened or closed to open or close the conveying channel. According to the scheme, when the gate is closed, a soil plugging effect can be formed, so that muck can be conveyed in the upward direction. According to the shaftless blade with the cutting part, on one hand, the passing area in the conveying channel is increased, the possibility that the shaftless blade is clamped by large-block muck is reduced, on the other hand, large-size sundries can be cut, faults caused by sundries clamping stagnation and the like in the muck conveying process can be reduced, and it is ensured that muck generated in tunneling construction can be smoothly conveyed.

Description

Technical Field

[0001] The utility model relates to the technical field of underground engineering, in particular to a shaftless screw conveyor and excavation equipment having the same. Background Art

[0002] According to the "Metro Design Code", when the continuous length of two single-track tunnels is greater than 600m, a connecting passage should be set up. The usual construction method is to use the freezing method for reinforcement, and then use the mining method to excavate the connecting passage. However, the freezing method construction is prone to adverse consequences such as frost heave and thaw settlement, which usually causes a certain amount of ground subsidence. When the ground subsidence is large, there is even a risk of collapse. This is particularly difficult to adapt to urban core areas with complex geological conditions and high environmental protection requirements. In addition, this construction method has a long construction period, usually requiring more than 100 days of freezing before excavation can begin, which often makes the construction period as long as 4-6 months. In addition, for strata with sand layers and pressurized water, the freezing method is not effective, and accidents are prone to occur, which has a great impact on the environment and is very risky.

[0003] In recent years, a method of using an assembled communication channel structure and mechanical communication channel construction has been proposed. The mechanical method requires the use of excavation equipment to cut the segments of the completed main tunnel. The debris and other debris generated by cutting are transported from the cutting position to the ground or other processing sites through corresponding conveying equipment. An example of conveying equipment is a screw conveyor. However, the fiber reinforcement embedded in the main tunnel segment and large-sized stones and other debris can easily block the screw machine of the excavation equipment, and hard materials such as stones will wear the blade shaft and the inner wall of the barrel section of the screw conveyor. Due to the soil pressure in the barrel section of the screw conveyor, it is quite difficult to dredge it, which is not conducive to the smooth excavation of the construction equipment. This adds extra time to repair the equipment and leads to a longer construction period.

[0004] Therefore, it is desirable to provide a conveyor for tunneling equipment to at least partially solve the above problems. Utility Model Content

[0005] The utility model aims to provide a shaftless screw conveyor for tunneling equipment to adapt to the cutting operation in the process of mechanical communication channel construction.

[0006] According to one aspect of the utility model, the shaftless screw conveyor comprises:

[0007] A cylinder, wherein a conveying passage extending along the axial direction of the cylinder is formed inside the cylinder;

[0008] a blade, the blade being at least partially disposed in the cylinder and driven to rotate by a rotary drive device, the blade being a shaftless blade extending helically along the axial direction of the cylinder, wherein a cutting portion is disposed on the radially outer side of at least a portion of the blade located in the cylinder; and

[0009] A gate is arranged downstream of the blade along the conveying direction, and the gate can be controlled to open or close to open or close the conveying channel.

[0010] In some embodiments, a wear-resistant layer is provided on the inner wall of the cylinder corresponding to the cutting portion.

[0011] In some embodiments, the cutting portion is constructed as a wear-resistant block welded on the body of the blade, or a wear-resistant alloy sheet embedded in the body of the blade, or a mesh wear-resistant layer welded on the body of the blade. Preferably, the wear-resistant block is constructed in the shape of an elongated strip, the length direction of the wear-resistant block is parallel to the axial direction of the cylinder or inclined relative to the axial direction of the cylinder, and a plurality of wear-resistant blocks are arranged along the spiral direction of the blade. Alternatively, the wear-resistant block is constructed in the shape of an elongated strip, the length direction of the wear-resistant block is parallel to the spiral direction of the blade, and a plurality of wear-resistant blocks are arranged along the axial direction of the cylinder. Alternatively, the wear-resistant block is constructed as dot-shaped protrusions dispersedly arranged on the radial outer surface of the blade.

[0012] In some embodiments, the body of the blade is formed by connecting a plurality of sub-segments arranged along the axial direction, wherein the axial extension length of each sub-segment is one pitch; or, the body of the blade is integrally formed by a hot rolling process.

[0013] In some embodiments, the cylinder body is formed by connecting a plurality of cylinder segments arranged along the axial direction.

[0014] In some embodiments, at least one barrel segment is a telescoping structure formed by an inner barrel segment and an outer barrel segment.

[0015] In some embodiments, the cylinder body includes a first portion consisting of the inner cylinder segment and other cylinder segments connected to the inner cylinder segment, and a second portion consisting of the outer cylinder segment or other cylinder segments connected to the outer cylinder segment;

[0016] Wherein, the shaftless screw conveyor is provided with a guide device, and the guide device comprises:

[0017] a guide rod extending along an axial direction of the cylinder, the guide rod being connected to one of the first part and the second part; and

[0018] A guide groove is provided on the other of the first part and the second part, the guide groove extends along the axial direction of the cylinder, the guide rod is slidably accommodated in the guide groove along the axial direction, and the groove wall of the guide groove prevents the guide rod from moving along the circumferential direction of the cylinder.

[0019] In some embodiments, the shaftless screw conveyor is provided with a telescopic drive device, and the telescopic drive device includes a drive cylinder, and both ends of the drive cylinder are respectively connected to the first part and the second part.

[0020] In some embodiments, a lubrication chamber for containing lubricating grease is provided between the overlapping portions of the inner cylinder segment and the outer cylinder segment.

[0021] In some embodiments, the cylinder is provided with an earth pressure sensor for sensing earth pressure in the shaftless screw conveyor, and the lubrication chamber is adjusted based on a sensing result of the earth pressure sensor.

[0022] In some embodiments, the rotation drive device comprises:

[0023] a driving machine for providing a driving force for the rotation of the blades; and

[0024] A driving flange is drivingly connected to the driving machine, and the blade is coaxially connected to the driving flange.

[0025] In some embodiments, the driving flange is cylindrical in shape, and the driving flange is disposed in the cylindrical body and constitutes a part of the conveying channel.

[0026] In some embodiments, a wear-resistant copper sleeve is provided on the inner wall of the cylinder at a position corresponding to the driving flange, and the driving flange is supported on the wear-resistant copper sleeve and rotates relative to the wear-resistant copper sleeve.

[0027] In some embodiments, the rotary drive device is provided with a lubricating oil tank, and the surface of the wear-resistant copper sleeve is provided with a spiral oil groove, and the spiral oil groove is connected to the lubricating oil tank.

[0028] In some embodiments, a wear-resistant steel sleeve is provided at the axial end of the driving flange, and the driving flange is in frictional contact with the inner wall of the cylinder at the axial end through the wear-resistant steel sleeve.

[0029] In some embodiments, the wear-resistant steel sleeve is detachably connected to the drive flange.

[0030] In some embodiments, a sealing structure is provided between the wear-resistant steel sleeve at each axial end of the driving flange and the inner wall of the cylinder, and the sealing structure at least includes a lip seal ring and a rotating Gly ring.

[0031] In some embodiments, two rotating Gly rings and two lip seal rings are axially spaced apart for each wear-resistant steel sleeve, wherein the two lip seal rings are located between the two rotating Gly rings.

[0032] In some embodiments, a lubrication chamber for containing lubricating grease is provided between two adjacent lip seal rings.

[0033] In some embodiments, the outer wall surface of the driving flange is provided with driving teeth, and the driving machine is connected to the driving flange by gear transmission; or,

[0034] The driving machine is connected to the driving flange by means of belt transmission.

[0035] In some embodiments, the cylinder is provided with a liquid injection tube penetrating through the cylinder wall.

[0036] In some embodiments, a safety gate is further provided between the gate and the blades, wherein the safety gate remains normally open when the shaftless screw conveyor is in a normal operating state, and switches to a closed state when the shaftless screw conveyor is in an abnormal operating state and the gate cannot be closed, wherein the normal operating state is an operating state in which the operating parameters of the shaftless screw conveyor are within a predetermined range, and the abnormal operating state is an operating state in which the operating parameters of the shaftless screw conveyor exceed a predetermined range.

[0037] According to another aspect of the utility model, a tunneling equipment is also provided, wherein the tunneling equipment is provided with the shaftless screw conveyor as described above. Preferably, the shaftless screw conveyor is tilted in such a way that the outlet end of the cylinder is higher than the inlet end of the cylinder.

[0038] According to the technical solution of the utility model, the following technical effects can be achieved:

[0039] The gate behind the blade can be kept closed during the initial operation of the shaftless screw conveyor, and the soil plug effect is used to maintain sufficient pressure in the conveying channel, so as to overcome the gravity of the slag and convey it in an upward direction. The blade is a shaftless blade. On the one hand, it increases the passage area in the conveying channel and reduces the possibility of being stuck by large pieces of slag. On the other hand, it also avoids the original fiber tendons being entangled on the blade shaft. In addition, the blade is also provided with a cutting part, which can work together with the cylinder to cut the fiber tendons and avoid the fiber tendons being entangled on the blade. According to the shaftless screw conveyor of the utility model, it is possible to reduce failures caused by debris jamming and other reasons during the slag transportation process, and ensure that the slag generated by the excavation construction can be smoothly transported. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0041] Figure 1 It is a stereogram of a preferred embodiment of the shaftless screw conveyor according to the utility model;

[0042] Figure 2 for Figure 1 The schematic diagram of the shaftless screw conveyor cut along the axis shown;

[0043] Figure 3 for Figure 1 Another schematic diagram of a shaftless screw conveyor cut along the axis, wherein the gate is omitted;

[0044] Figure 4 for Figure 3 A partial enlarged view of the middle A part;

[0045] Figure 5 For along Figure 3 A schematic diagram of the BB line section in FIG. ; and

[0046] Figure 6 for Figure 1 A schematic diagram of a preferred embodiment of the tunneling equipment according to the utility model. DETAILED DESCRIPTION

[0047] Now, with reference to the accompanying drawings, the specific embodiments of the present invention are described in detail. What is described here is only the preferred embodiment of the present invention. Those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and the other ways also fall within the scope of the present invention.

[0048] In order to realize the interconnection of underground space network, a large number of T-shaped connecting tunnels need to be built. For example: subway, highway section connecting passages, subway entrances and exits and ventilation shafts, municipal pipe gallery inspection shafts, long tunnel intermediate ventilation shafts, water tunnel connecting lines, etc. Recently, a method of using mechanical methods to construct T-shaped connecting passages in tunnel groups has been proposed. In response to this construction method, the utility model provides a shaftless screw conveyor, which can be used on excavation equipment such as shield machines or pipe jacking machines, and is used to transport debris such as slag generated by excavation and cutting to the ground or other treatment sites.

[0049] like Figure 1 and Figure 2 As shown, in some embodiments, the shaftless screw conveyor 1 mainly includes a cylinder 10, blades 20, a gate 30 and a rotary drive device 40. The cylinder 10 is roughly cylindrical, and a conveying channel 101 extending along its own axial direction is formed inside. The blades 20 are at least partially arranged in the cylinder 10, and rotate around the axis of the cylinder 10 under the driving action of the rotary drive device 40, and are used to convey debris such as slag along the axial direction of the cylinder 10. The gate 30 is arranged downstream of the blades 20 along the conveying direction. The gate 30 can be selectively controlled to open and close to open or close the conveying channel 101.

[0050] The mechanical method is used to construct the T-shaped connecting channel of the tunnel group. The main tunnel segments corresponding to the connecting channel position in the main tunnel are usually specially treated, for example, they are made of composite materials, and glass fiber tendons are embedded in them. According to the utility model, the blade 20 is a shaftless blade that extends spirally along the axial direction of the cylinder 10. Therefore, in the installed state, the axial direction of the blade 20 roughly coincides with the axial direction of the cylinder 10. Because the blade shaft is eliminated, it can be avoided that the original blade shaft is stuck due to fiber tendon winding and other reasons. In addition, a cutting portion 202 is provided on the radial outer side of at least a part of the blade 20, which can cooperate with the cylinder 10 to achieve a cutting effect on debris such as fiber tendons, such as cutting off longer fiber tendons, or crushing larger stones. It is beneficial for the blade 20 to continuously push the slag forward along the conveying direction, avoid blockage, and ensure continuous conveying.

[0051] Preferably, if Figure 3As shown, the inner wall of the portion of the cylinder 10 corresponding to the cutting portion 202 of the blade 20 is provided with a wear-resistant layer 102. The wear-resistant layer 102 can be, for example, a lining layer of a cemented carbide material, which is beneficial to improving the wear resistance of the cylinder 10 and extending its service life. According to actual needs, the wear-resistant layer 102 can be provided only at the inlet end, i.e., the front end, of the cylinder 10, and the cutting portion 202 can be provided at the corresponding position of the front end of the blade 20, or the wear-resistant layer 102 can be provided along the entire length of the cylinder 10, and the cutting portion 202 can be provided along the entire length of the blade 20.

[0052] In some embodiments, the cutting portion 202 may be constructed as a plurality of wear-resistant blocks welded to the body 201 of the blade 20. The wear-resistant blocks may be made of materials such as cemented carbide. Each wear-resistant block may be constructed as a long strip, the length direction of which is roughly parallel to the axial direction of the cylinder 10, and the plurality of wear-resistant blocks are arranged along the spiral extension direction of the blade 20. Alternatively, the length direction of the wear-resistant block may be inclined relative to the axial direction of the blade 20, and the plurality of wear-resistant blocks may be arranged along the spiral extension direction of the blade 20. Alternatively, the length direction of the wear-resistant block may be parallel to the spiral direction of the blade 20, and the plurality of wear-resistant blocks may be arranged along the axial direction. Alternatively, the wear-resistant blocks may also be constructed as dot-shaped protrusions dispersedly arranged on the radial outer surface of the blade 20. In some embodiments, the cutting portion may also be constructed as a wear-resistant alloy sheet embedded in the body of the blade, or as a mesh wear-resistant layer welded on the body of the blade. Reference Figure 2 In the illustrated embodiment, the body 201 of the blade 20 is formed by connecting a plurality of sub-segments 21 arranged along the axial direction. Preferably, the extension length of each sub-segment 21 along the axial direction is approximately one pitch. In another embodiment, the body of the blade can also be a structure integrally formed by a hot rolling process.

[0053] Preferably, in some embodiments, the cylinder 10 may include a plurality of cylinder segments connected and arranged along the axial direction. Figure 3 As shown, the cylinder 10 may include a first cylinder segment 11, a second cylinder segment 12, a third cylinder segment 13, a fourth cylinder segment 14 and a fifth cylinder segment 15 arranged along the conveying direction. Adjacent cylinder segments are butted together through flange structures at the ends, and sealing rings are provided to form a seal, so as to separate the conveying channel 101 from the external environment at the connection.

[0054] Preferably, at least one of the multiple cylinder sections constituting the cylinder body 10 can be constructed as a telescopic structure. Figure 3In the illustrated embodiment, the third cylinder segment 13 is retractable, and includes an outer cylinder segment 131 and an inner cylinder segment 132 nested in the outer cylinder segment 131. By sliding the outer cylinder segment 131 and the inner cylinder segment 132 relative to each other in the axial direction, the length of the third cylinder segment 13 can be adjusted, and the overall length of the cylinder body 10 can be adjusted at the same time, and finally the length of the shaftless screw conveyor extending into the soil bin can be adjusted. One advantage of the telescopic function is that the shaftless screw conveyor can be repaired when it is stuck. For example, when a stuck situation occurs, the cylinder body 10 is adjusted to retract, so that the stuck position is exposed, and the cylinder body 10 is re-adjusted to extend after clearing the debris between the inside of the cylinder segment and the blade shaft, so as to continue working.

[0055] Preferably, the shaftless screw conveyor 1 is also provided with a telescopic drive device 134, which may include a drive cylinder, such as a hydraulic cylinder. One end of the drive cylinder is connected to the outer cylinder section 131 or other cylinder sections fixedly connected to the outer cylinder section 131, and the other end is connected to the inner cylinder section 132 or other cylinder sections fixedly connected to the inner cylinder section 132. By driving the hydraulic cylinder, the telescopic adjustment of the cylinder body 10 is achieved. Among them, the outer cylinder section 131 and other cylinder sections fixedly connected thereto can be referred to as the first part of the cylinder body 10, and the inner cylinder section 132 and other cylinder sections fixedly connected thereto can be referred to as the second part of the cylinder body 10.

[0056] Preferably, the shaftless screw conveyor 1 is also provided with a guide device 50. The guide device 50 can be used to limit the relative movement between the outer cylinder section 131 and the inner cylinder section 132, so that the two can only slide relative to each other in the axial direction, but cannot rotate relative to each other. The guide device 50 may include a guide rod 51 connected to one of the first part and the second part of the cylinder 10, and a guide groove 52 arranged on the other of the first part and the second part. In the illustrated embodiment. The guide rod 51 is connected to the second part of the cylinder 10, and the guide groove 52 is arranged on the first part. Among them, the guide rod 51 extends along the axial direction of the cylinder 10. The guide groove 52 is defined between two rollers arranged at intervals, and it extends roughly along the axial direction. The guide rod 51 is slidably accommodated in the guide groove 52. The contact between the roller (equivalent to the groove wall of the guide groove 52) and the guide rod 51 limits the possibility of the guide rod 51 moving in directions other than the axial direction, for example, limiting the movement of the guide rod 51 along the circumferential direction of the cylinder 10, that is, limiting the relative rotation between the inner cylinder section 132 and the outer cylinder section 132. In addition, the roller can also reduce the friction force when the guide rod 51 slides in the guide groove 52.

[0057] Preferably, in order to reduce the friction force when the outer cylinder section 131 and the inner cylinder section 132 slide relative to each other, a lubrication chamber 133 is provided between the overlapping parts of the two. Lubricating grease (such as butter) can be injected into the lubrication chamber 133, and sealing rings are provided at both ends of the axial direction. The lubricating grease can play a lubricating role when the outer cylinder section 131 and the inner cylinder section 132 slide relative to each other. In addition, the lubricating grease has a certain pressure, and the slag, muddy water, etc. in the conveying channel 101 will not leak out of the cylinder body 10 due to the blocking of the sealing ring and the lubricating grease, thereby effectively isolating the leakage of slag. Furthermore, a soil pressure sensor 103 can also be provided on the cylinder body 10 to monitor the soil pressure in the conveying channel 101 in real time. The pressure of the lubricating grease injected into the lubrication chamber 133 can be adjusted according to the detected soil pressure, so that the pressure on both sides of the sealing ring is balanced, and a better sealing effect can be achieved. Among them, at least one cylinder section of the cylinder body 10 is a non-retractable integrated structure. The soil pressure sensor 103 can preferably be installed on the cylinder section of the non-retractable integrated structure. In addition, a liquid injection pipe 104 penetrating the cylinder wall may be provided on the cylinder section of the non-retractable integrated structure for injecting water or foam etc. into the conveying channel 101 to improve the properties of the slag and facilitate the discharge of the slag.

[0058] The fifth barrel section 15 located at the end of the barrel 10 not only constitutes the barrel, but also forms the outer shell of the rotation drive device 40. Figures 3 to 5 As shown, the rotation drive device 40 includes a driving machine 41 and a driving flange 42. The driving machine 41 is used to provide driving force for the rotation of the blade 20, and it can be, for example, a hydraulic motor. The driving flange 42 is roughly cylindrical, which is arranged in the cylinder 10 (i.e., in the fifth cylinder section 15) and constitutes a part of the conveying channel 101. The driving flange 42 is coaxially fixedly connected to the blade 20 on the one hand, and is transmission-connected to the driving machine 41 on the other hand. When the driving machine 41 is working, it drives the blade 20 to rotate through the driving flange 42.

[0059] The blade 20 can be connected to the driving flange 42 by, for example, welding, for example, the blade 20 can be welded to the inner wall of the driving flange 42. The transmission mode between the driving machine 41 and the driving flange 42 can be, for example, gear transmission. For example, the driving flange 42 can be fixedly connected with the large gear ring 43 on the outside by fasteners such as bolts, and the large gear ring 43 is meshed with the pinion 44. The pinion 44 is connected to the output shaft of the driving machine 41 by means of spline matching. In the illustrated embodiment, the rotary drive device 40 includes two groups of driving machines 41 to provide enough driving force. In addition, in other embodiments, the driving machine and the driving flange can also be connected by means such as belt transmission.

[0060] Continue to refer Figure 4Preferably, the inner wall of the fifth cylinder section 15 is provided with a wear-resistant copper sleeve 45 at the portion corresponding to the driving flange 42. The large gear ring 43 is provided at a position approximately in the axial middle of the driving flange 42, and the wear-resistant copper sleeves 45 are provided on both sides of the large gear ring 43. The wear-resistant copper sleeves 45 have a substantially L-shaped axial cross section so as to be in frictional contact with the driving flange 42 and the large gear ring 43, respectively. The wear-resistant copper sleeves 45 can support and position the driving flange 42.

[0061] In addition, a spiral oil groove (not shown) is provided on the end surface of the wear-resistant copper sleeve 45. The rotary drive device 40 also includes a lubricating oil tank (not shown), and the large gear ring 43 and the small gear 44 can be at least partially immersed in the lubricating oil tank. Through the rotation of the large gear ring 43, part of the lubricating grease in the lubricating oil tank can enter the spiral oil groove, thereby forming a lubricating oil film on the end surface of the wear-resistant copper sleeve 45, which is conducive to reducing the friction between the wear-resistant copper sleeve 45 and the driving flange 42 and the large gear ring 43, making the rotation smoother.

[0062] Preferably, the axial end of the driving flange 42 is also provided with a wear-resistant steel sleeve 46, which is fixed to the driving flange 42 in a detachable manner (e.g., bolted connection) and rotates therewith. The driving flange 42 is in frictional contact with the inner wall of the cylinder 10 through the wear-resistant steel sleeve 46 at the axial end. During the rotation process, the wear-resistant steel sleeve 46 replaces the driving flange 42 to withstand friction. Therefore, when the wear reaches a predetermined degree, the old wear-resistant steel sleeve 46 can be removed and replaced with a new wear-resistant steel sleeve 46 without replacing the driving flange 42 as a whole. This is particularly advantageous when the blade 20 is welded to the driving flange 42, which greatly reduces the cost of replacing parts due to friction and wear.

[0063] In addition, in order to prevent debris such as mud, slag, etc. from entering the transmission system of the rotary drive device 40 and causing adverse effects on the gears, preferably, a sealing structure is provided between the wear-resistant steel sleeve 46 and the inner wall of the cylinder 10. In some embodiments, the sealing structure includes a rotating Gly ring 47 and a lip seal ring 48. Preferably, for each wear-resistant steel sleeve 46, two sets of rotating Gly rings 47 and lip seal rings 48 are arranged at intervals along the axial direction. These seal rings are arranged at intervals along the axial direction, and the arrangement is that two lip seal rings 48 are arranged between two rotating Gly rings 47.

[0064] Preferably, a lubrication chamber 49 is provided between the two lip seals 48, into which lubricating grease can be injected. The lubricating grease can reduce the wear of the wear-resistant steel sleeve 46, and can also take away a portion of the heat generated by friction when the lubricating grease is discharged. The rotating Gly ring 47 can prevent mud and sand from entering the lip seal 48, and prevent the lubrication chamber 49 from losing pressure due to the wear of the lip seal 48 by mud and sand, thereby successfully preventing mud and sand from entering the gear box of the rotary drive device 40 and contaminating the gear box, and ensuring the smooth operation of the rotary drive device 40.

[0065] The gate 30 is arranged downstream of the rotary drive device 40. When the shaftless screw conveyor 1 is initially operated, the gate 30 is closed, so that a soil plug effect is formed at the inlet end of the cylinder 10. At the inlet end, the slag is subjected to the squeezing force generated by the soil plug effect, thereby being able to overcome the gravity of the slag, allowing the slag to be transported in an upward direction. When the slag is transported to the position of the gate 30, the gate 30 can be controlled to open so as to continuously transport the slag. In addition, when the shaftless screw conveyor operates abnormally, for example, the pressure in the cylinder 10 is too high, in order to avoid gushing, the gate 30 can be controlled to close, which plays a safety role.

[0066] Furthermore, in addition to the gate 30, a safety gate 31 is also provided. In the illustrated embodiment, the safety gate 31 is provided between the gate 30 and the blade 20. The safety gate 31 can serve as a safety redundancy for the shaftless screw conveyor, and it remains in a normally open state when the shaftless screw conveyor is in a normal operating state. Once the operating state of the shaftless screw conveyor is abnormal, and the gate 30 fails and cannot be closed, the safety gate 31 can be controlled to switch to a closed state to avoid gushing. It can be understood that the normal operating state can be an operating state in which the operating parameters of the shaftless screw conveyor are within a predetermined range, and the abnormal operating state can be an operating state in which the operating parameters of the shaftless screw conveyor exceed a predetermined range.

[0067] It can be understood that the term "gate" herein refers to an opening and closing device that can control the opening and closing of a conveying channel, and thus various valve structures can also be used in the solution of the present utility model as other embodiments of the gate.

[0068] According to another aspect of the utility model, a tunneling equipment is also provided, which may be, for example, a shield machine or a pipe jacking machine. Figure 6A tunneling equipment 2 according to a preferred embodiment is schematically shown, which includes an equipment body 3 and a cutter disc 4 arranged at the front end of the equipment body 3. The tunneling equipment 2 is also provided with a shaftless screw conveyor 1 according to the first aspect of the utility model. The shaftless screw conveyor 1 can be integrated in the equipment body 3, for example. Since there is no original drive shaft, the conveying channel 101 of the shaftless screw conveyor 1 is through at the position of the blade 20. Therefore, the shaftless screw conveyor 1 of the tunneling equipment 2 according to the utility model can simultaneously meet the requirements of operating in the earth pressure balance mode and operating in the mud water balance mode. When the tunneling equipment 2 needs to switch between the earth pressure balance mode and the mud water balance mode due to the different stratum structures encountered during the tunneling process, such switching can be performed directly without considering the switching requirements of the conveyor.

[0069] Preferably, the shaftless screw conveyor 1 is tilted in the excavation equipment 2 in such a way that the outlet end of the barrel 10 is higher than the inlet end. The gate 30 of the shaftless screw conveyor 1 can be closed during initial operation, and cooperates with the through cavity formed in the barrel 10 due to the shaftless blades 20, so as to produce a soil plug effect at the inlet end of the barrel 10. Therefore, the squeezing force of the soil plug effect can be used to overcome the gravity of the slag. This makes it possible to use the shaftless blades to transport the slag upward.

[0070] The above description of various embodiments of the present invention is provided to a person of ordinary skill in the relevant art for the purpose of description. It is not intended to exclude or limit the present invention to a single disclosed embodiment. As above, a person of ordinary skill in the art will understand the various substitutions and variations of the present invention. Therefore, although some alternative embodiments are specifically described, a person of ordinary skill in the art will understand or relatively easily develop other embodiments. The present invention is intended to include all substitutions, modifications and variations of the present invention described herein, as well as other embodiments that fall within the spirit and scope of the present invention described above.

Claims

1. A shaftless screw conveyor for excavation equipment, characterized in that: The shaftless screw conveyor comprises: A cylinder (10), wherein a delivery channel (101) extending along the axial direction of the cylinder (10) is formed inside the cylinder (10); a blade (20), the blade (20) being at least partially disposed in the barrel (10) and driven to rotate by a rotation drive device (40), the blade (20) being an axisless blade extending helically along the axial direction of the barrel (10), wherein a cutting portion (202) is disposed radially outside at least a portion of the blade (20) located in the barrel (10); and A gate (30) is arranged downstream of the blade (20) along the conveying direction, and the gate (30) can be controlled to open or close to open or close the conveying channel (101).

2. The shaftless screw conveyor according to claim 1, characterized in that: The inner wall of the portion of the cylinder (10) corresponding to the cutting portion (202) is provided with a wear-resistant layer (102).

3. The shaftless screw conveyor according to claim 1, characterized in that: The cutting portion (202) is constructed as a wear-resistant block welded on the body (201) of the blade (20), or a wear-resistant alloy sheet embedded in the body (201) of the blade (20), or a mesh wear-resistant layer built-up on the body (201) of the blade (20).

4. The shaftless screw conveyor according to claim 3, characterized in that: The wear-resistant block is configured in the shape of a long strip, the length direction of the wear-resistant block is parallel to the axial direction of the cylinder (10) or is inclined relative to the axial direction of the cylinder (10), and a plurality of wear-resistant blocks are arranged along the spiral direction of the blade (20), or, The wear-resistant block is configured as a long strip, the length direction of the wear-resistant block is parallel to the spiral direction of the blade (20), and a plurality of wear-resistant blocks are arranged along the axial direction of the cylinder (10), or, The wear-resistant blocks are configured as dot-shaped protrusions dispersedly arranged on the radial outer surface of the blade (20).

5. The shaftless screw conveyor according to claim 1, characterized in that: The body (201) of the blade (20) is formed by connecting a plurality of sub-segments (21) arranged along the axial direction, wherein the axial extension length of each sub-segment (21) is one pitch; or, the body (201) of the blade (20) is integrally formed by a hot rolling process.

6. The shaftless screw conveyor according to claim 1, characterized in that: The cylinder (10) is formed by connecting a plurality of cylinder segments arranged along the axial direction.

7. The shaftless screw conveyor according to claim 6, characterized in that: At least one cylinder segment is a telescopic structure formed by an inner cylinder segment (132) and an outer cylinder segment (131).

8. The shaftless screw conveyor according to claim 7, characterized in that: The cylinder (10) comprises a first part consisting of the inner cylinder section (132) and other cylinder sections connected to the inner cylinder section (132), and a second part consisting of the outer cylinder section (131) or other cylinder sections connected to the outer cylinder section (131); The shaftless screw conveyor is provided with a guide device (50), wherein the guide device (50) comprises: a guide rod (51) extending along the axial direction of the cylinder (10), the guide rod (51) being connected to one of the first part and the second part; and A guide groove (52), wherein the guide groove (52) is arranged on the other of the first part and the second part, the guide groove (52) extends along the axial direction of the cylinder (10), the guide rod (51) is slidably accommodated in the guide groove (52) along the axial direction, and the groove wall of the guide groove (52) prevents the guide rod (51) from moving along the circumferential direction of the cylinder (10).

9. The shaftless screw conveyor according to claim 8, characterized in that: The shaftless screw conveyor is provided with a telescopic driving device (133), and the telescopic driving device (133) comprises a driving cylinder, and two ends of the driving cylinder are respectively connected to the first part and the second part.

10. The shaftless screw conveyor according to claim 7, characterized in that: A lubrication chamber for containing lubricating grease is provided between the overlapping portions of the inner cylinder section (132) and the outer cylinder section (131).

11. The shaftless screw conveyor according to claim 10, characterized in that: The cylinder (10) is provided with an earth pressure sensor (103) for sensing the earth pressure in the shaftless screw conveyor, and the lubrication chamber is adjusted based on the sensing result of the earth pressure sensor (103).

12. The shaftless screw conveyor according to claim 1, characterized in that: The rotary drive device (40) comprises: a driving machine (41), the driving machine (41) being used to provide driving force for the rotation of the blade (20); and A driving flange (42) is drivingly connected to the driving machine (41), and the blade (20) is coaxially connected to the driving flange (42).

13. The shaftless screw conveyor according to claim 12, characterized in that: The driving flange (42) is configured in a cylindrical shape. The driving flange (42) is disposed in the cylindrical body (10) and constitutes a part of the conveying passage (101).

14. The shaftless screw conveyor according to claim 12, characterized in that: A wear-resistant copper sleeve (45) is provided on the inner wall of the cylinder (10) at a position corresponding to the drive flange (42), and the drive flange (42) is supported on the wear-resistant copper sleeve (45) and rotates relative to the wear-resistant copper sleeve (45).

15. The shaftless screw conveyor according to claim 14, characterized in that: The rotary drive device (40) is provided with a lubricating oil tank, and the surface of the wear-resistant copper sleeve (45) is provided with a spiral oil groove, which is communicated with the lubricating oil tank.

16. The shaftless screw conveyor according to claim 13, characterized in that: The axial end of the driving flange (42) is provided with a wear-resistant steel sleeve (46), and the driving flange (42) is in frictional contact with the inner wall of the cylinder (10) at the axial end through the wear-resistant steel sleeve (46).

17. The shaftless screw conveyor according to claim 16, characterized in that: The wear-resistant steel sleeve (46) is detachably connected to the driving flange (42).

18. The shaftless screw conveyor according to claim 16, characterized in that: A sealing structure is provided between the wear-resistant steel sleeve (46) at each axial end of the driving flange (42) and the inner wall of the cylinder (10), and the sealing structure at least comprises a lip seal ring (48) and a rotating Gly ring (47).

19. The shaftless screw conveyor according to claim 18, characterized in that: For each of the wear-resistant steel sleeves (46), two rotating Gly rings (47) and two lip seal rings (48) are arranged at intervals along the axial direction, wherein the two lip seal rings (48) are located between the two rotating Gly rings (47).

20. The shaftless screw conveyor according to claim 19, characterized in that: A lubrication chamber for containing lubricating grease is arranged between two adjacent lip seal rings (48).

21. The shaftless screw conveyor according to claim 12, characterized in that: The outer wall surface of the driving flange (42) is provided with driving teeth, and the driving machine (41) is connected to the driving flange (42) by means of gear transmission; or, The driving machine (41) is connected to the driving flange (42) by means of belt transmission.

22. The shaftless screw conveyor according to claim 1, characterized in that: The cylinder (10) is provided with a liquid injection tube (104) penetrating the cylinder wall.

23. The shaftless screw conveyor according to claim 1, characterized in that: A safety gate (31) is also provided between the gate (30) and the blade (20), wherein the safety gate (31) remains in a normally open state when the shaftless screw conveyor is in a normal operating state, and switches to a closed state when the shaftless screw conveyor is in an abnormal operating state and the gate (30) cannot be closed. The normal operating state is an operating state in which the operating parameters of the shaftless screw conveyor are within a predetermined range, and the abnormal operating state is an operating state in which the operating parameters of the shaftless screw conveyor exceed the predetermined range.

24. A tunneling equipment, characterized in that: The excavation equipment (2) is provided with a shaftless screw conveyor (1) according to any one of claims 1 to 23.

25. The excavation equipment according to claim 24, characterized in that: The shaftless screw conveyor (1) is arranged to be inclined in such a way that the outlet end of the cylinder (10) is higher than the inlet end of the cylinder (10).

Images