A normal pressure cutterhead assembly and tunneling equipment

Abstract

The present invention belongs to the technical field of tunneling equipment, and specifically relates to a normal pressure cutterhead assembly and tunneling equipment. The normal pressure cutterhead assembly includes a normal pressure cutterhead; a plurality of roller cutter groups are arranged on the normal pressure cutterhead, each roller cutter group includes a triple roller cutter and a double-edged roller cutter located at different circumferential positions of the normal pressure cutterhead, the triple roller cutter includes a triple roller cutter first cutter ring, a triple roller cutter second cutter ring, and a triple roller cutter third cutter ring arranged in sequence, and the three cutter rings of the triple roller cutter share the same cutter shaft; the double-edged roller cutter includes a double-edged roller cutter first cutter ring and a double-edged roller cutter second cutter ring arranged in sequence; wherein the spacing between the triple roller cutter first cutter ring and the triple roller cutter second cutter ring is smaller than the spacing between the triple roller cutter second cutter ring and the triple roller cutter third cutter ring, and is also smaller than the spacing between the double-edged roller cutter first cutter ring and the double-edged roller cutter second cutter ring; in the radial direction of the normal pressure cutterhead, the double-edged roller cutter first cutter ring is located between the triple roller cutter second cutter ring and the triple roller cutter third cutter ring.

Description

Technical Field

[0001] The invention belongs to the technical field of tunneling equipment, and in particular relates to a normal pressure cutterhead assembly and tunneling equipment. Background Art

[0002] In recent years, the number of national urbanization construction and underground space development projects has increased, and super-large slurry shields have been widely used in river-crossing and sea-crossing tunnel projects with complex hydrogeological conditions. However, long-distance, high-water-pressure stratum normal pressure cutter replacement is a major difficulty in the construction of shield tunnels across rivers and seas.

[0003] As the head structure of the shield machine during construction, the cutter disc plays a vital role. The cutter spacing design of the conventional shield cutter disc should be changed with the different compressive strength of the stratum. Generally speaking, the higher the stratum strength, the smaller the cutter spacing required. The normal pressure cutter disc assembly includes a normal pressure cutter disc and a roller cutter installed on the normal pressure cutter disc. The normal pressure cutter disc usually includes a plurality of boxes arranged at intervals in the circumference. The roller cutter includes a cutter barrel installed on the box. The front end of the cutter barrel is rotatably installed with a cutter ring. The box is also installed with a gate. When the roller cutter is taken out of the box for replacement, the gate closes the channel where the cutter barrel is installed in the box to achieve normal pressure cutter replacement. In the normal pressure cutter disc assembly, due to factors such as the size of the cutter barrel and the structural strength of the box, the cutter spacing variation range is very small regardless of hard rock formations or soft rock formations. In the prior art, the roller cutters arranged in the normal pressure cutter disc are mostly double-axis double-edged roller cutters and double-jointed roller cutters shown in the Chinese utility model patent with authorization announcement number CN214660185U. The two cutter rings of the double-shaft double-edged hob are each equipped with a cutter shaft, and an intermediate isolation support body is installed in the middle of the hob to support the two cutter shafts. The two cutter rings in the double-joint hob share a cutter shaft. Specifically, a cutter hub is installed on the cutter shaft corresponding to each cutter ring, and the cutter ring is installed on the cutter hub; each cutter hub is rotatably installed on the cutter shaft through two single-row tapered roller bearings.

[0004] At present, the cutter spacing of mainstream international equipment manufacturers is mostly 90-100mm. For formations with uniaxial compressive strength UCS≥150Mpa, the cutter spacing of 90-100mm is too large. The cracks generated after the roller cuts roll the rock cannot intersect, affecting the rock breaking efficiency. It does not meet the design principle of minimum crushing specific energy and the tool consumption is huge.

[0005] Therefore, how to reduce the distance between cutters has become an urgent problem that designers need to solve. Among them, the double-axis double-edged hob cannot be further reduced due to the isolation support body between the two cutter rings. The distance between the two cutter rings in the double-jointed hob can be reduced, but after the reduction, the axial space of the cutter shaft is not enough to install four bearings, so the number of bearings can only be reduced. However, after the number of bearings is reduced, the bearing capacity of the hob decreases accordingly. In the prior art, some people also use the method of alternating the double-axis double-edged hob or the double-jointed hob to reduce the distance between cutters. Specifically, one of the cutter discs of the No. 2 hob is in the same radial position as the middle position of the two cutter discs of the No. 1 hob, so that the distance between cutters is reduced to half of the distance between the two cutter discs of the hob. This method can reduce the distance between cutters, but the radial area that can be covered by a pair of hobs is small, the number of hobs is large, the strength of the box cannot be guaranteed, and the opening rate of the normal pressure cutter disc is low, which is not easy to discharge slag during excavation. Summary of the invention

[0006] The purpose of the present invention is to provide a normal pressure cutterhead assembly to reduce the distance between cutters while taking into account the structural strength and bearing capacity of the normal pressure cutterhead; and also to provide a tunneling equipment using the normal pressure cutterhead assembly to achieve the above purpose.

[0007] To achieve the above-mentioned purpose, the technical solution of the normal pressure cutter disc assembly provided by the present invention is: a normal pressure cutter disc assembly, including a normal pressure cutter disc; a plurality of cutter groups are arranged on the normal pressure cutter disc, each cutter group includes a triple cutter and a double-edged cutter located at different circumferential positions of the normal pressure cutter disc, the triple cutter includes a triple cutter first cutter ring, a triple cutter second cutter ring, and a triple cutter third cutter ring arranged in sequence, and the three cutter rings of the triple cutter share the same cutter shaft; the double-edged cutter includes a double-edged cutter first cutter ring and a double-edged cutter second cutter ring arranged in sequence; wherein the spacing between the triple cutter first cutter ring and the triple cutter second cutter ring is smaller than the spacing between the triple cutter second cutter ring and the triple cutter third cutter ring, and is also smaller than the spacing between the double-edged cutter first cutter ring and the double-edged cutter second cutter ring; in the radial direction of the normal pressure cutter disc, the double-edged cutter first cutter ring is located between the triple cutter second cutter ring and the triple cutter third cutter ring.

[0008] Beneficial effects: The present invention adopts a staggered arrangement of triple hobs and double-edged hobs to reduce the cutter spacing. At the same time, the triple hob's first cutter ring and the triple hob's second cutter ring can also achieve a small cutter spacing arrangement, thereby forming an arrangement of three small cutter spacings. Compared with the arrangement in which all hobs are designed with a small cutter spacing, the spacing between the triple hob's second cutter ring and the triple hob's third cutter ring and the spacing between the double-edged hob's first cutter ring and the double-edged hob's second cutter ring in the triple hob of the present invention is larger, and the bearing capacity is larger. Compared with the method in which all hobs are double hobs and are designed with a large spacing, the staggered arrangement of the triple hob and the double-edged hob in the present invention can cover a larger radial area, reduce the number of hobs, and thus improve the structural strength and opening rate of the normal pressure cutter disc. Compared with the form in which the three cutter rings of the triple hob are all designed with a large spacing and are staggered with two double-edged hobs, the outer diameter of the triple hob is smaller. The smaller the outer diameter of the triple hob, the smaller the corresponding gate size, and the larger the opening rate of the normal pressure cutter disc. The normal pressure cutter disc assembly of the present invention takes various considerations into account, and realizes the design of the cutter spacing under the premise of ensuring the structural strength of the normal pressure cutter disc, the bearing capacity of the hob cutter, and the opening rate.

[0009] Preferably, the spacing between the first cutting ring of the double-edged hob and the second cutting ring of the double-edged hob is equal to the spacing between the second cutting ring of the triple-joint hob and the third cutting ring of the triple-joint hob, and both are twice the spacing between the first cutting ring of the triple-joint hob and the second cutting ring of the triple-joint hob; in the radial direction of the normal pressure cutter disc, the spacing between the second cutting ring of the triple-joint hob, the third cutting ring of the triple-joint hob and the first cutting ring of the double-edged hob are equal. By designing the spacing, the spacing between two adjacent cutting rings in the radial direction is ensured to be equal, and the consistency of crack formation is ensured.

[0010] Preferably, the spacing between the first cutting ring of the double-edged hob and the second cutting ring of the double-edged hob is 150 mm.

[0011] Preferably, the atmospheric pressure cutter disc comprises a plurality of boxes arranged in sequence along the circumferential direction, and on the same box, triple cutters and double-edged cutters are arranged alternately in sequence along the radial direction. The triple cutters and double-edged cutters are arranged alternately in sequence, and the structural strength of the box is improved compared with the method of all triple cutters.

[0012] Preferably, the double-edged hob is a two-piece hob that shares the same cutter shaft. Both the two-piece hob and the three-piece hob include a cutter barrel and a support seat integrally formed in the cutter barrel. A C-shaped block is provided on the support seat. The cutter shafts of the two-piece hob and the three-piece hob penetrate into the C-shaped block. The two-piece hob and the three-piece hob also include a wedge block that presses the cutter shaft into the C-shaped block, and a bolt that penetrates the support seat to pull the wedge block. The C-shaped block is directly supported on the support seat, and the force exerted on the C-shaped block by the hob and the cutter shaft can be directly transmitted to the support seat without damaging the bolt.

[0013] The technical scheme of the tunneling equipment of the present invention is: a tunneling equipment, including a main beam and a normal pressure cutter disc assembly arranged on the main beam, the normal pressure cutter disc assembly includes a normal pressure cutter disc; a plurality of roller cutter groups are arranged on the normal pressure cutter disc, each roller cutter group includes a triple roller cutter and a double-edge roller cutter located at different circumferential positions of the normal pressure cutter disc, the triple roller cutter includes a triple roller cutter first cutter ring, a triple roller cutter second cutter ring, and a triple roller cutter third cutter ring arranged in sequence, and the three cutter rings of the triple roller cutter share the same cutter shaft; the double-edge roller cutter includes a double-edge roller cutter first cutter ring and a double-edge roller cutter second cutter ring arranged in intervals; wherein the spacing between the triple roller cutter first cutter ring and the triple roller cutter second cutter ring is smaller than the spacing between the triple roller cutter second cutter ring and the triple roller cutter third cutter ring, and is also smaller than the spacing between the double-edge roller cutter first cutter ring and the double-edge roller cutter second cutter ring; in the radial direction of the normal pressure cutter disc, the double-edge roller cutter first cutter ring is located between the triple roller cutter second cutter ring and the triple roller cutter third cutter ring.

[0014] Beneficial effects: The present invention adopts a staggered arrangement of triple hobs and double-edged hobs to reduce the cutter spacing. At the same time, the triple hob's first cutter ring and the triple hob's second cutter ring can also achieve a small cutter spacing arrangement, thereby forming an arrangement of three small cutter spacings. Compared with the arrangement in which all hobs are designed with a small cutter spacing, the spacing between the triple hob's second cutter ring and the triple hob's third cutter ring and the spacing between the double-edged hob's first cutter ring and the double-edged hob's second cutter ring in the triple hob of the present invention is larger, and the bearing capacity is larger. Compared with the method in which all hobs are double hobs and are designed with a large spacing, the staggered arrangement of the triple hob and the double-edged hob in the present invention can cover a larger radial area, reduce the number of hobs, and thus improve the structural strength and opening rate of the normal pressure cutter disc. Compared with the form in which the three cutter rings of the triple hob are all designed with a large spacing and are staggered with two double-edged hobs, the outer diameter of the triple hob is smaller. The smaller the outer diameter of the triple hob, the smaller the corresponding gate size, and the larger the opening rate of the normal pressure cutter disc. The normal pressure cutter disc assembly of the present invention takes various considerations into account, and realizes the design of the cutter spacing under the premise of ensuring the structural strength of the normal pressure cutter disc, the bearing capacity of the hob cutter, and the opening rate.

[0015] Preferably, the spacing between the first cutting ring of the double-edged hob and the second cutting ring of the double-edged hob is equal to the spacing between the second cutting ring of the triple-joint hob and the third cutting ring of the triple-joint hob, and both are twice the spacing between the first cutting ring of the triple-joint hob and the second cutting ring of the triple-joint hob; in the radial direction of the normal pressure cutter disc, the spacing between the second cutting ring of the triple-joint hob, the third cutting ring of the triple-joint hob and the first cutting ring of the double-edged hob are equal. By designing the spacing, the spacing between two adjacent cutting rings in the radial direction is ensured to be equal, and the consistency of crack formation is ensured.

[0016] Preferably, the spacing between the first cutting ring of the double-edged hob and the second cutting ring of the double-edged hob is 150 mm.

[0017] Preferably, the atmospheric pressure cutter disc comprises a plurality of boxes arranged in sequence along the circumferential direction, and on the same box, triple cutters and double-edged cutters are arranged alternately in sequence along the radial direction. The triple cutters and double-edged cutters are arranged alternately in sequence, and the structural strength of the box is improved compared with the method of all triple cutters.

[0018] Preferably, the double-edged hob is a two-piece hob that shares the same cutter shaft. Both the two-piece hob and the three-piece hob include a cutter barrel and a support seat integrally formed in the cutter barrel. A C-shaped block is provided on the support seat. The cutter shafts of the two-piece hob and the three-piece hob penetrate into the C-shaped block. The two-piece hob and the three-piece hob also include a wedge block that presses the cutter shaft into the C-shaped block, and a bolt that penetrates the support seat to pull the wedge block. The C-shaped block is directly supported on the support seat, and the force exerted on the C-shaped block by the hob and the cutter shaft can be directly transmitted to the support seat without damaging the bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the normal pressure cutter disc assembly provided by the present invention;

[0020] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0021] Figure 3 The schematic diagram of the knife spacing design of the present invention;

[0022] Figure 4 It is a structural schematic diagram of a double-jointed hob in a normal pressure cutter disc assembly provided by the present invention;

[0023] Figure 5 for Figure 4 Schematic diagram of the AA section.

[0024] Description of reference numerals:

[0025] 1. Normal pressure cutter disc; 2. Box body; 3. Two-unit hob; 31. First cutter ring of two-unit hob; 32. Second cutter ring of two-unit hob; 33. Cutter barrel; 34. Support seat; 35. Cutter shaft; 36. C-shaped block; 37. First bolt; 38. Wedge block; 39. Second bolt; 310. Nut; 4. Triple hob; 41. First cutter ring of three-unit hob; 42. Second cutter ring of three-unit hob; 43. Third cutter ring of three-unit hob. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0028] It should be noted that relational terms such as "first" and "second" that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, elements defined by the sentence "including a...", etc., do not exclude the process or method that includes the elements.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The present invention is described in further detail below in conjunction with embodiments.

[0032] The specific embodiment of the normal pressure cutter disc assembly provided by the present invention is as follows:

[0033] like Figures 1 to 5 As shown, the normal pressure cutterhead assembly includes a normal pressure cutterhead 1, which includes a plurality of boxes 2 arranged at intervals along the circumferential direction, and a plurality of roller cutters are installed on each box 2, and the roller cutters cooperate with each other to crush rocks.

[0034] In this embodiment, the hobs are divided into two categories, one is a double hob 3, and the other is a triple hob 4. The structure of the double hob 3 is as follows: Figure 4 and Figure 5 As shown, the double hob 3 includes a cutter barrel 33, on which a cutter shaft 35 is fixedly mounted, and on which a first cutter ring 31 and a second cutter ring 32 of the double hob are rotatably mounted via a bearing, and the arrangement thereof is shown in the Chinese utility model patent with the authorization announcement number CN214660185U, and will not be described in detail here. Figure 4 and Figure 5 As shown, the cross-sections at both ends of the cutter shaft 35 are special-shaped cross-sections. A support seat 34 is integrally formed in the cutter barrel 33, and a C-shaped block 36 is fixed on the support seat 34. Specifically, the C-shaped block 36 is supported on the support seat 34 and fixed by a first bolt 37. One side of the C-shaped block 36 is open, and the cutter shaft 35 is inserted from the opening of the C-shaped block 36. The double hob 3 also includes a wedge block 38, which presses down the cutter shaft 35 and presses the cutter shaft 35 onto the C-shaped block 36 through the wedge surface. The wedge block 38 is fixed to the support seat 34 by a second bolt 39 and a nut 310. Specifically, the second bolt 39 passes through the support seat 34.

[0035] When in use, the force acting on the first cutting ring 31 and the second cutting ring 32 of the double-jointed hob is transmitted to the cutter shaft 35, and the force acting on the cutter shaft 35 is further transmitted to the C-shaped block 36. Since the C-shaped block 36 is directly supported on the support seat 34, the first bolt 37 and the second bolt 39 do not bear any force, thereby avoiding bolt breakage.

[0036] In this embodiment, the distance between the first cutting ring 31 of the double hob and the second cutting ring 32 of the double hob is 150 mm.

[0037] The structure of the triple hob 4 is similar to that of the double hob 3, except that the triple hob 4 includes three cutter rings, namely, the first cutter ring 41 of the triple hob, the second cutter ring 42 of the triple hob, and the third cutter ring 43 of the triple hob. In this embodiment, the spacing between the first cutter ring 41 of the triple hob and the second cutter ring 42 of the triple hob is 75 mm, and the spacing between the second cutter ring 42 of the triple hob and the third cutter ring 43 of the triple hob is 150 mm. Since the spacing between the first cutter ring 41 of the triple hob and the second cutter ring 42 of the triple hob is small, there is not enough space to arrange four bearings, so the first cutter ring 41 of the triple hob and the second cutter ring 42 of the triple hob share a cutter hub and are equipped with two bearings.

[0038] In this embodiment, Figure 1 and Figure 2 As shown, the cutters on the same housing 2 are alternately arranged as double cutters 3 and triple cutters 4, and the cutters on the same housing 2 are arranged radially at intervals. To reduce the cutter spacing, the double cutters 3 and the triple cutters 4 on other housings 2 are arranged alternately. The principle of the interleaving is as follows: Figure 3 As shown, in the radial direction of the normal pressure cutter disc 1, the first cutter ring 31 of the double cutter 3 in the double cutter is located between the second cutter ring 42 and the third cutter ring 43 of the triple cutter in the other box 2, and the spacing between the first cutter ring 31 of the double cutter and the second cutter ring 42 and the third cutter ring 43 of the triple cutter is 75mm. This arrangement reduces the cutter spacing of the entire normal pressure cutter disc assembly to 75mm, which is effective in dealing with formations of 150MPa and above. According to the calculation of the CSN model company of the Colorado School of Mines, under the same thrust, the smaller the cutter spacing, the greater the penetration, and the rock crack expansion ability is closely related to the cutter penetration. The greater the penetration, the stronger the crack expansion ability, the stronger the rock breaking ability of the cutter, and the less the tool consumption.

[0039] The normal pressure cutter disc assembly of the present invention uses a staggered arrangement of a double cutter 3 and a triple cutter 4 to reduce the cutter spacing, and the three cutter rings in the triple cutter 4 have different spacings, and two of the cutter rings also form a small cutter spacing, wherein the two cutter rings cooperate with the double cutter 3 to form a small cutter spacing. Considerations such as cutter spacing, the number of cutters, the diameter of the cutter barrel, and the strength of the housing 2 are taken into account. Compared with the method in which the cutter rings in the double cutter 3 and the triple cutter 4 are both 75 mm, the bearing capacity of the cutter is improved. Compared with the method in which the cutter rings in the two double cutters 3 are both 150 mm and staggered, the radial area that can be covered by the double cutter 3 and the triple cutter 4 in the present invention is larger, which reduces the use of the cutters. The fewer the number of cutters, the greater the opening rate of the central area of ​​the normal pressure cutter disc 1, which reduces the probability of the cutter disc forming mud cakes, and the slag discharge is smoother. Moreover, after the number of cutters is reduced, the utilization rate of a single cutter barrel is improved, the structural strength of the housing 2 is increased, and the strength of the normal pressure cutter disc assembly is higher. Compared with the triple cutter 4 in which the distance between each cutter ring is 150 mm and the cutter ring is staggered with two double cutters 3 , the triple cutter 4 of the present invention has a smaller cutter barrel diameter and a higher structural strength of the box body 2 .

[0040] In this embodiment, the double cutter 3 has two cutting rings, which are double-edged cutters. Since the two cutting rings of the double cutter 3 are far apart, in other embodiments, the double-edged cutter may be a double-shaft double-edged cutter.

[0041] In this embodiment, the cutter shafts in the double hob 3 and triple hob 4 are fixed by C-shaped blocks and wedge-shaped blocks, and the bolts corresponding to the C-shaped blocks and wedge-shaped blocks are all installed on the support seat. In other embodiments, only the bolts corresponding to the C-shaped blocks are installed on the support seat, and a pressure block is pressed on the bottom of the support seat, and the bolts corresponding to the wedge-shaped blocks pass through the pressure block.

[0042] In this embodiment, the double-edged hobs and triple-edged hobs 4 in each box 2 are arranged alternately in sequence. In other embodiments, the arrangement can be changed according to actual conditions, such as one box has double-edged hobs and the other has triple-edged hobs.

[0043] In this embodiment, the triple cutter 4 and the double-edged cutter belong to the same cutter group. In fact, the number of triple cutters 4 and double-edged cutters in the cutter group can be increased or decreased. For example, a cutter group can have two double-edged cutters in the same radial position and one triple cutter.

[0044] In this embodiment, the first cutting ring 31 of the double-jointed hob constitutes the first cutting ring of the double-edged hob, and the second cutting ring 32 of the double-jointed hob constitutes the second cutting ring of the double-edged hob. The spacing between the first cutting ring of the double-edged hob and the second cutting ring of the double-edged hob is 150 mm. In other embodiments, the spacing between the two can be changed, for example, it can be 160 mm, 140 mm, etc.

[0045] In this embodiment, the spacing between the first cutting circle of the double-edged hob and the second cutting circle of the double-edged hob is equal to the spacing between the second cutting circle 42 of the triple hob and the third cutting circle 43 of the triple hob, and is equal to twice the spacing between the first cutting circle 41 of the triple hob and the second cutting circle 42 of the triple hob; at the same time, the spacing between the second cutting circle 42 of the triple hob and the third cutting circle 43 of the triple hob and the first cutting circle of the double-edged hob is equal. In other embodiments, each spacing can be arranged flexibly, for example, the spacing between the second cutting circle of the triple hob and the third cutting circle of the triple hob and the first cutting circle of the double-edged hob is not equal; for another example, the spacing between the first cutting circle of the double-edged hob and the second cutting circle of the double-edged hob may not be equal to the spacing between the second cutting circle of the triple hob and the third cutting circle of the triple hob.

[0046] Specific embodiments of the tunneling equipment of the present invention:

[0047] The tunneling equipment includes a main beam and a normal pressure cutterhead assembly installed on the main beam. The structure of the normal pressure cutterhead assembly is the same as that of the above-mentioned embodiments of the normal pressure cutterhead assembly, and will not be repeated here.

[0048] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A normal pressure cutter disc assembly, comprising a normal pressure cutter disc (1); characterized in that: A plurality of roller cutter groups are arranged on the normal pressure cutter disc (1), each roller cutter group comprises a triple roller cutter (4) and a double-edged roller cutter located at different positions in the circumferential direction of the normal pressure cutter disc (1), the triple roller cutter (4) comprises a triple roller cutter first cutting ring (41), a triple roller cutter second cutting ring (42), and a triple roller cutter third cutting ring (43) arranged in sequence at intervals, and the three cutting rings of the triple roller cutter (4) share the same cutting axis (35); the double-edged roller cutter comprises a double-edged roller cutter first cutting ring, a double-edged roller cutter second cutting ring (42), and a double-edged roller cutter third cutting ring (43) arranged in sequence at intervals The invention relates to a second cutting ring of a triple cutter; wherein the spacing between the first cutting ring (41) of the triple cutter and the second cutting ring (42) of the triple cutter is smaller than the spacing between the second cutting ring (42) of the triple cutter and the third cutting ring (43) of the triple cutter, and is also smaller than the spacing between the first cutting ring of the double cutter and the second cutting ring of the double cutter; in the radial direction of the normal pressure cutter disc (1), the first cutting ring of the double cutter is located between the second cutting ring (42) of the triple cutter and the third cutting ring (43) of the triple cutter.

2. The normal pressure cutter disc assembly according to claim 1 is characterized in that: The spacing between the first cutting circle of the double-edged hob and the second cutting circle of the double-edged hob is equal to the spacing between the second cutting circle (42) of the triple hob and the third cutting circle (43) of the triple hob, and both are twice the spacing between the first cutting circle (41) of the triple hob and the second cutting circle (42) of the triple hob; in the radial direction of the normal pressure cutter disc (1), the spacing between the second cutting circle (42) of the triple hob and the third cutting circle (43) of the triple hob is equal to the first cutting circle of the double-edged hob.

3. The normal pressure cutter disc assembly according to claim 2 is characterized in that: The distance between the first cutting circle of the double-edged hob and the second cutting circle of the double-edged hob is 150 mm.

4. The normal pressure cutter disc assembly according to claim 1, 2 or 3, characterized in that: The normal pressure cutter disc (1) comprises a plurality of boxes (2) arranged in sequence along the circumferential direction, and on the same box (2), triple rollers (4) and double-edged rollers are arranged alternately in sequence along the radial direction.

5. The normal pressure cutter disc assembly according to claim 1, 2 or 3, characterized in that: The double-edged hob is a double-jointed hob (3) sharing a common cutter shaft (35). Both the double-jointed hob (3) and the triple-jointed hob (4) comprise a cutter barrel (33) and a support seat (34) integrally formed in the cutter barrel (33). A C-shaped block (36) is provided on the support seat (34). The cutter shaft (35) of the double-jointed hob (3) and the triple-jointed hob (4) penetrates into the C-shaped block (36). The double-jointed hob (3) and the triple-jointed hob (4) further comprise a wedge-shaped block (38) for pressing the cutter shaft (35) into the C-shaped block (36), and a bolt penetrating the support seat (34) to pull the wedge-shaped block (38).

6. A tunneling device, comprising a main beam and a normal pressure cutterhead assembly arranged on the main beam, the normal pressure cutterhead assembly comprising a normal pressure cutterhead (1); characterized in that: A plurality of roller cutter groups are arranged on the normal pressure cutter disc (1), each roller cutter group comprises a triple roller cutter (4) and a double-edged roller cutter located at different positions in the circumferential direction of the normal pressure cutter disc (1), the triple roller cutter (4) comprises a triple roller cutter first cutting ring (41), a triple roller cutter second cutting ring (42), and a triple roller cutter third cutting ring (43) arranged in sequence at intervals, and the three cutting rings of the triple roller cutter (4) share the same cutting axis (35); the double-edged roller cutter comprises a double-edged roller cutter first cutting ring, a double-edged roller cutter second cutting ring (42), and a double-edged roller cutter third cutting ring (43) arranged in sequence at intervals The invention relates to a second cutting ring of a triple cutter; wherein the spacing between the first cutting ring (41) of the triple cutter and the second cutting ring (42) of the triple cutter is smaller than the spacing between the second cutting ring (42) of the triple cutter and the third cutting ring (43) of the triple cutter, and is also smaller than the spacing between the first cutting ring of the double cutter and the second cutting ring of the double cutter; in the radial direction of the normal pressure cutter disc (1), the first cutting ring of the double cutter is located between the second cutting ring (42) of the triple cutter and the third cutting ring (43) of the triple cutter.

7. The tunneling equipment according to claim 6, characterized in that: The spacing between the first cutting circle of the double-edged hob and the second cutting circle of the double-edged hob is equal to the spacing between the second cutting circle (42) of the triple hob and the third cutting circle (43) of the triple hob, and both are twice the spacing between the first cutting circle (41) of the triple hob and the second cutting circle (42) of the triple hob; in the radial direction of the normal pressure cutter disc (1), the spacing between the second cutting circle (42) of the triple hob and the third cutting circle (43) of the triple hob is equal to the first cutting circle of the double-edged hob.

8. The tunneling equipment according to claim 6, characterized in that: The distance between the first cutting circle of the double-edged hob and the second cutting circle of the double-edged hob is 150 mm.

9. The tunneling equipment according to claim 6, 7 or 8, characterized in that: The normal pressure cutter disc (1) comprises a plurality of boxes (2) arranged in sequence along the circumferential direction, and on the same box (2), triple rollers (4) and double-edged rollers are arranged alternately in sequence along the radial direction.

10. The tunneling equipment according to claim 6, 7 or 8, characterized in that: The double-edged hob is a double-jointed hob (3) sharing a common cutter shaft (35). Both the double-jointed hob (3) and the triple-jointed hob (4) comprise a cutter barrel (33) and a support seat (34) integrally formed in the cutter barrel (33). A C-shaped block (36) is provided on the support seat (34). The cutter shaft (35) of the double-jointed hob (3) and the triple-jointed hob (4) penetrates into the C-shaped block (36). The double-jointed hob (3) and the triple-jointed hob (4) further comprise a wedge-shaped block (38) for pressing the cutter shaft (35) into the C-shaped block (36), and a bolt penetrating the support seat (34) to pull the wedge-shaped block (38).

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