Cutter head structure optimizing device of rock tube push bench

Abstract

The utility model relates to a cutter head structure optimizing device of a rock tube push bench. The cutter head structure optimizing device comprises a crushing cutter head and a secondary crushing device, the secondary crushing device comprises a crushing arm and a conical crushing bin, the crushing arm is fixed to the back face of the crushing cutter head, crushing strips are annularly arranged on the side, facing the crushing arm, of the conical crushing bin, a muddy water bin is arranged on the back face of the conical crushing bin, and screening holes are formed between the two crushing strips at the bottommost portion of the conical crushing bin and used for allowing gravel muck to enter the muddy water bin. The rock crushing device has the advantages that the crushing arms are arranged on the back face of the crushing cutterhead, the crushing strips are correspondingly arranged on the surface of the conical crushing bin, and when the crushing cutterhead rotates, the crushing arms and the crushing strips squeeze rock fragments to further crush the rock fragments, so that the rock crushing efficiency is improved, and follow-up discharging is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe jacking, and in particular comprises a cutter head structure optimization device for a rock pipe jacking machine. Background Art

[0002] With the continuous acceleration of urbanization, the construction of domestic municipal engineering projects has developed rapidly. In order to improve the utilization rate of land resources, drainage pipes, natural gas pipelines, power cables and urban pipe network transformation have gradually shifted to underground space, and underground comprehensive pipe gallery projects have emerged. According to engineering practice, the buried depth of the pipe gallery is generally 5 to 10 meters, and the buried depth is relatively shallow. Its construction method mostly adopts open excavation method, that is, open excavation cast-in-place method and segment prefabrication assembly method. When the underground pipe gallery passes through complex urban environments such as mountains and needs to be constructed by dark excavation method, the commonly used methods are mainly mechanical excavation method and jacking method. In the construction of the pipe gallery tunnel, the tunnel section is relatively small, that is, the internal space is small. When the mechanical method is used for construction, the conventional TBM tunnel boring machine is too large to meet the small section excavation requirements. The use of jacking method for construction also faces the problem of efficient rock breaking and jacking of hard rock.

[0003] The existing rock jacking machines used in tunnel excavation can be divided into circular section jacking machines and rectangular section jacking machines. The circular section jacking machine mainly uses roller cutters evenly distributed on the panel in a radial pattern, combined with a secondary crushing device to form a cutting system. Although this cutting system can meet the excavation requirements of circular tunnel sections, it is extremely difficult for ordinary jacking machines to excavate hard rock formations with a rock strength of more than 90MPa. The common single-edged roller cutter has weak rock breaking ability and severe tool wear. In addition, due to the small opening rate of the cutterhead, the slag removal efficiency of the cutter rock fragments is low, which greatly restricts the construction progress and quality of the project. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and provide a rock pipe jacking machine cutter head structure optimization device.

[0005] The rock pipe jacking machine cutter head structure optimization device comprises: a crushing cutter head and a secondary crushing device;

[0006] The cutter disc panel of the crushing cutter disc has two rows of positive rollers symmetrically arranged in a cross shape, with scrapers on both sides of the positive rollers. Two layers of edge rollers are arranged circumferentially on the edge of the cutter disc panel, and the two layers of edge rollers are staggered;

[0007] The secondary crushing device includes a crushing arm and a conical crushing chamber. The crushing arm is fixed on the back of the crushing cutter disc. The conical crushing chamber is provided with crushing bars in a circumferential direction toward the crushing arm. A mud and water chamber is provided on the back of the conical crushing chamber. A screening hole is provided between the two crushing bars at the bottom of the conical crushing chamber for allowing crushed stone and slag to enter the mud and water chamber.

[0008] The back of the mud and water bin is connected with a water inlet pipe and a mud discharge pipe.

[0009] Preferably, the two layers of edge cutters are respectively the first edge cutter and the second edge cutter, the first edge cutter is perpendicular to the cutter disc panel, and the angle between the first edge cutter and the axis of the adjacent positive cutter is 25° clockwise.

[0010] Preferably, the angle between the second edge hob and the axis where the adjacent positive hob is located is 25° counterclockwise, and the angle between the second edge hob and the cutter disc panel is 45°.

[0011] Preferably, the water inlet pipe and the mud discharge pipe are both arranged on one side of the mud and water bin close to the bottom of the cutter disc, and the mud discharge pipe is arranged below the water inlet pipe.

[0012] Preferably, a main shaft is provided at the center of the conical crushing chamber, the cutter head panel and the crushing arm rotate around the main shaft, the conical crushing chamber is fixed, and the crushing bars are protruding from the surface of the conical crushing chamber.

[0013] Preferably, a point-shaped slag inlet is provided between the angles of two rows of positive roller cutters symmetrically arranged in a cross shape.

[0014] The beneficial effects of the utility model are:

[0015] 1) The utility model arranges a crushing arm on the back of the crushing disc, and a crushing bar is correspondingly arranged on the surface of the conical crushing chamber. When the crushing disc rotates, the crushing arm and the crushing bar squeeze the rock fragments to further crush them, thereby improving the crushing efficiency of the rock and facilitating subsequent discharge.

[0016] 2) The utility model provides a screening hole between the two crushing bars at the bottom of the conical crushing bin. After the large-size rock fragments cut initially are rotated and squeezed by the crushing arms of the cutter disc and the crushing bars on the conical crushing bin for secondary crushing, they enter the mud and water bin through the screening holes provided in the lower half of the conical crushing bin, and a mud discharge pipe is provided on the side of the mud and water bin close to the bottom of the cutter disc, thereby improving the mud discharge efficiency, reducing the accumulation of debris, and avoiding the squeezing of rock fragments at the bottom of the over-excavation gap of the pipe jacking machine, which causes an increase in the jacking resistance.

[0017] 3) The utility model adds a point-shaped slag inlet on the cutter head panel, increases the opening rate of the cutter head panel, and makes it easier for the cut rock to enter the cutter head, thus preventing the broken pieces from falling on the bottom of the pipe jacking machine and causing problems such as pipe jamming and difficulty in jacking, thereby improving the excavation efficiency and slag discharge efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the crushing cutter disc structure;

[0019] Figure 2 It is a schematic diagram of the secondary crushing device;

[0020] Figure 3 Schematic diagram of the mud inlet and outlet system.

[0021] Explanation of the reference numerals: cutter disc panel 1, positive roller cutter 2, first edge roller cutter 3, second edge roller cutter 4, scraper 5, slag inlet 6, crushing arm 7, crushing bar 8, conical crushing chamber 9, screening hole 10, main shaft 11, mud and water chamber 12, water inlet pipe 13, mud discharge pipe 14. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the embodiments. The description of the following embodiments is only used to help understand the utility model. It should be pointed out that for ordinary people in this technical field, the utility model can also be modified in some ways without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0023] As an example, Figures 1 to 3 As shown, this rock jacking machine cutter head structure optimization device includes: a jacking machine cutting and crushing system and a mud inlet and discharge system, the cutting and crushing system includes a crushing cutter head and a secondary crushing device; the mud inlet and discharge system consists of a mud and water bin 12, a water inlet pipe 13, and a mud discharge pipe 14.

[0024] like Figure 1 As shown, two rows of positive rollers 2 are symmetrically arranged in a cross shape on the cutter head panel 1 of the crushing cutter head, a point-shaped slag inlet is provided between the angles of the two rows of positive rollers 2 symmetrically arranged in a cross shape, and scrapers 5 are provided on both sides of the positive rollers 2.

[0025] The first edge cutter 3 and the second edge cutter 4 are provided in the circumferential direction at the edge of the cutter head panel 1, and each group of edge cutters has 4 cutters. The first edge cutter 3 is perpendicular to the cutter head panel 1, and the angle between the first edge cutter 3 and the axis where the adjacent positive cutter 2 is located is 25° clockwise. The angle between the second edge cutter 4 and the axis where the adjacent positive cutter 2 is located is 25° counterclockwise, that is, the first edge cutter 3 and the second edge cutter 4 are staggered. The second edge cutter 4 and the cutter head panel 1 are at an angle of 45°, which balances the rock breaking capacity of the edge cutter and the positive cutter 2, improves the force on the cutter, reduces vibration, and prolongs the service life of the cutter.

[0026] The positive cutter 2 and the edge cutter are 15-inch double-edged cutters with inlaid teeth, and the scraper 5 is installed in a double-row screw hole form. By increasing the size of the cutter and combining the inlaid teeth, the penetration of the cutter into the hard rock is improved. Compared with the prior art, the spacing between adjacent cutters is reduced to 70 mm in this embodiment to increase the number of cutters, improve the rock breaking ability of the cutter disc, and achieve smooth cutting of rocks in hard rock formations with a uniaxial compressive strength of 90 to 160 MPa. In addition, the slag inlet 6 opened at the cutter and scraper 5 is enlarged, the edge scraper 5 adopts a trapezoidal opening, and the remaining cutters and positive scrapers adopt a rectangular opening. A point-shaped slag inlet is added in the middle of the panels of the two adjacent rows of positive cutters 2 to increase the opening rate of the cutter disc panel 1. As the pipe jacking machine is pushed forward, the cut rock is easier to enter the cutter disc, avoiding the problem of broken pieces falling on the bottom of the pipe jacking machine causing pipe jamming and difficulty in pushing forward, thereby improving the excavation efficiency and slag removal efficiency.

[0027] like Figure 2 As shown, the secondary crushing device includes a crushing arm 7 and a conical crushing chamber 9. The crushing arm 7 is fixed on the back of the crushing cutter disc, and a crushing bar 8 is circumferentially provided on the conical crushing chamber 9 facing the crushing arm 7.

[0028] A main shaft 11 is provided at the center of the conical crushing chamber 9. The crushing arm 7 and the conical crushing chamber are connected to a variable frequency drive motor through the main shaft 11. The variable frequency drive motor drives the hob, the cutter head panel 1, and the crushing arm 7 to rotate around the main shaft 11. The conical crushing chamber 9 is fixed, and the crushing bar 8 protrudes from the surface of the conical crushing chamber 9.

[0029] like Figure 2 and Figure 3 As shown, a mud and water bin 12 is provided on the back of the conical crushing bin 9, and a screening hole 10 is provided between the two crushing bars 8 at the bottom of the conical crushing bin 9 for allowing crushed stone and slag to enter the mud and water bin 12; a water inlet pipe 13 and a mud discharge pipe 14 are connected to the back of the mud and water bin 12.

[0030] The water inlet pipe 13 and the mud discharge pipe 14 are both arranged on one side of the mud and water bin 12 close to the bottom of the cutter disc. The mud discharge pipe 14 is arranged below the water inlet pipe 13. The large-size rock fragments cut for the first time are rotated and squeezed by the crushing arm 7 and the crushing bars 8 on the conical crushing bin 9 for secondary crushing, and then enter the mud and water bin 12 through the screening holes 10 arranged in the lower half of the conical crushing bin 9. Since a large amount of crushed stone and slag cannot be immediately output to the ground through the mud discharge pipe 14 arranged at the bottom of the mud and water bin 12, in order to avoid pipe blockage and pipe jam caused by sediment accumulated at the bottom of the pipe jacking machine, in this embodiment, the mud discharge pipe 14 is moved down to a position 15 cm above the bottom of the cutter disc to reduce the accumulation of slag and avoid squeezing rock fragments at the bottom of the over-excavation gap of the pipe jacking machine, which increases the jacking resistance.

Claims

1. A rock pipe jacking machine cutter head structure optimization device, characterized in that: include: Crushing disc and secondary crushing device; The cutter disc panel of the crushing cutter disc has two rows of positive rollers symmetrically arranged in a cross shape, with scrapers on both sides of the positive rollers. Two layers of edge rollers are arranged circumferentially on the edge of the cutter disc panel, and the two layers of edge rollers are staggered; The secondary crushing device includes a crushing arm and a conical crushing chamber. The crushing arm is fixed on the back of the crushing cutter disc. The conical crushing chamber is provided with crushing bars in a circumferential direction toward the crushing arm. A mud and water chamber is provided on the back of the conical crushing chamber. A screening hole is provided between the two crushing bars at the bottom of the conical crushing chamber for allowing crushed stone and slag to enter the mud and water chamber. The back of the mud and water bin is connected with a water inlet pipe and a mud discharge pipe.

2. The cutter head structure optimization device for a rock pipe jacking machine according to claim 1 is characterized in that: The two layers of edge cutters are respectively the first edge cutter and the second edge cutter. The first edge cutter is perpendicular to the cutter head panel. The angle between the first edge cutter and the axis of the adjacent positive cutter is 25° clockwise.

3. The cutter head structure optimization device for a rock pipe jacking machine according to claim 2 is characterized in that: The included angle between the second edge hob and the axis where the adjacent positive hob is located is 25° counterclockwise, and the included angle between the second edge hob and the cutter head panel is 45°.

4. The cutter head structure optimization device for a rock pipe jacking machine according to claim 1 is characterized in that: The water inlet pipe and the mud discharge pipe are both arranged on one side of the mud and water bin close to the bottom of the cutter disc, and the mud discharge pipe is arranged below the water inlet pipe.

5. The cutter head structure optimization device for a rock pipe jacking machine according to claim 1 is characterized in that: A main shaft is arranged at the center of the conical crushing chamber, a cutter plate and a crushing arm rotate around the main shaft, the conical crushing chamber is fixed, and a crushing bar is protruded on the surface of the conical crushing chamber.

6. The cutter head structure optimization device for a rock pipe jacking machine according to claim 1 is characterized in that: A point-shaped slag inlet is provided between the angles of two rows of positive roller cutters symmetrically arranged in a cross shape.

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