CN210003280U

CN210003280U - automatic tool changing device for shield machine hob

Info

Publication number: CN210003280U
Application number: CN201920338277.3U
Authority: CN
Inventors: 刘建琴; 张森; 王磊; 郭伟
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2019-03-18
Filing date: 2019-03-18
Publication date: 2020-01-31
Anticipated expiration: 2029-03-18

Abstract

The utility model discloses an an automatic tool changing device for shield constructs quick-witted hobbing cutter, including the tool box, multitool rotary device, flexible-strutting arrangement and pressurizer, the tool box is by upper and lower roof, cavity hexahedrons structure that left and right side board and preceding, backplate are constituteed, the tool box welds with shield constructs quick-witted knife disc panel, multitool rotary device installs inside the tool box, wherein the tool changing axle is on a parallel with upper and lower roof, both ends are connected perpendicularly respectively in left and right side board, by the actuating system drive on the curb plate, the epaxial equipartition of arbor that trades has four sets of the same flexible-strutting arrangement, flexible-strutting arrangement is by hobbing cutter and blade holder, mud discharge pipeline and flexible pneumatic cylinder for constituteing, three axis coincidence, pressurizer installs in the front baffle, by floodgate , second floodgate and pneumatic cylinder for the pressurize constitute the utility model provides high tool changing efficiency, the manual number of times of staff has been reduced, the down time, the operating efficiency has been improved, construction cost is reduced.

Description

automatic tool changing device for shield machine hob

Technical Field

The utility model belongs to the technical field of tunnel tunnelling construction shield equipment maintenance, in particular to automatic switching control equipment of shield constructs quick-witted hobbing cutter of being applied to.

Background

Meanwhile, in the tool changing process, in order to ensure the stability of the excavation surface and prevent water burst, the pressure of the excavation surface must be kept constant, so that the workers are required to enter a high-pressure environment for operation, the complexity and the time are wasted, and great threat is formed to the personal safety of the workers.

SUMMERY OF THE UTILITY MODEL

To the prior art, the utility model provides an automatic tool changing device for shield constructs quick-witted hobbing cutter can replace artifical tool changing in degree under the stable prerequisite of assurance excavation face, shortens the time of shutting down the tool changing, has improved the efficiency of construction, has reduced construction cost.

In order to solve the technical problem, the automatic tool changer for the shield machine hob comprises a cutter box, a multi-cutter rotating device and a telescopic-supporting device, wherein the cutter box is welded with a shield machine cutter disc panel, the cutter box is a cuboid box body formed by an upper top plate, a lower top plate, a left side plate, a right side plate, a front baffle and a rear baffle, the upper surface of the lower top plate is an inclined plane from back to front and is high and low, a slag discharge hole is formed in the front of the lower top plate, a left cutter shaft supporting hole and a side plate mud discharge port are formed in the left side plate, a cutter shaft changing right supporting hole is formed in the right side plate, a cutter hole is formed in the central area of the front baffle, a cutter shaft groove is formed in the upper middle upper portion of the front baffle, a positioning retaining ring is arranged at the front end of the cutter hole, a sensor is arranged on the inner surface of the positioning retaining ring, a pressure retaining chamber is formed in the rear end of the cutter hole, a second sensor is arranged on the inner surface of the cutter shaft supporting hole, the slurry changing gate, the slurry discharging port is arranged in a slurry discharging channel, the multi-changing rotating device comprises a cutter shaft supporting channel, a slurry discharging motor, a slurry discharging channel is arranged in a slurry discharging channel, a slurry discharging channel is embedded in a slurry discharging channel, a slurry discharging channel of a slurry discharging channel, a slurry discharging channel is embedded in a slurry discharging channel, a slurry discharging channel is embedded in a slurry discharging channel, a slurry discharging channel is embedded slurry discharging channel, a slurry discharging channel is embedded in a slurry discharging channel, a slurry discharging channel is embedded in a slurry discharging channel, a.

step of saying, an automatic tool changer for shield constructs quick-witted hobbing cutter, wherein, mud discharge casing pipe is including nested inner tube and outer tube each other, the blade holder is provided with blade holder mud discharge port, the inner tube outside with flexible pneumatic cylinder rigid coupling of using, the outer tube front end with flexible pneumatic cylinder rigid coupling of using, the outer tube rear end with tool changing axle middle part mud discharge passage rigid coupling, flexible using the pneumatic cylinder include eight, according to 45 distribute in at the interval the outer tube front end.

The tool apron mud discharging port is connected with a front end disc of the telescopic hydraulic cylinder through a bolt, and an outer pipe of the mud discharging sleeve is fixedly connected with the tool changing shaft.

And sealing structures are arranged between the cutter changing shaft and the cylindrical roller bearing, between the cylindrical roller bearing and the left side plate, between the cylindrical roller bearing and the right side plate, between the inner pipe and the outer pipe of the slurry discharge sleeve, and between the hydraulic cylinder for extension and the hydraulic cylinder for pressure maintaining.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses under corresponding actuating system and control system's cooperation, can realize automatic tool changing, under the condition that required tool changing number of times is no longer than three, can replace artifical tool changing completely. The telescopic-supporting device can realize the back-and-forth movement of the hob, namely the movement of the 'cutter feeding' and the 'cutter drawing', and after the hob moves forwards to a working position, the telescopic hydraulic cylinder is locked, so that the reaction force of an excavation surface can be reliably borne. The working time of manual tool changing is reduced, the safety threat to tool changing workers is eliminated, the construction efficiency can be improved, and the construction cost is reduced.

(2) Use the utility model discloses at the tool changing in-process, through opening and shutting of pressurizer's twice floodgate , guarantee excavation face operating pressure's stability to can improve the security of tool changing operation.

(3) Have the utility model discloses tool changing device's mud discharge line is: the mud passes through the hob base → mud discharge sleeve → mud discharge channel of the hob shaft → mud collection device outside the hob box. Can ensure smooth and unimpeded discharge of the slurry in the construction process.

(4) The utility model discloses in the seal structure that relates to including allowing to adjust hydraulic tubulose sealing member, when the pneumatic cylinder back-and-forth movement, self length direction's size can be adjusted to the tubulose sealing member to avoid the pneumatic cylinder to bear the wearing and tearing of sand and soil or rubble, in order to prevent causing the damage of pneumatic cylinder.

Drawings

FIG. 1 is a perspective view of the automatic cutter changer for a shield machine hob according to the present invention, partially cut in its entirety;

FIG. 2 is a partially cut-away perspective view of the medium pressure maintaining device of the present invention;

FIG. 3-1 is a front view of the hob and the hob holder of the present invention;

FIG. 3-2 is a left side view of the hob and the holder shown in FIG. 3-1;

FIG. 3-3 is a top view of the hob and the holder shown in FIG. 3-1;

3-4 are perspective views of the hob and the holder shown in FIG. 3-1;

fig. 4 is a perspective view of the telescoping-support device of the present invention;

FIG. 5 is a partial perspective view of the tool changing shaft, the left side plate and the right side plate of the present invention;

FIG. 6 is a cross-sectional view of the hob of the present invention during operation;

fig. 7 is a cross-sectional view of the tool changing process of the present invention with gate closed at ;

fig. 8 is a cross-sectional view of the second gate closed during tool changing in the present invention;

FIG. 9 is a schematic view of the rotation of the cutter changing shaft in the cutter changing process of the present invention;

fig. 10 is a sectional view of the second brake opened during tool changing according to the present invention;

fig. 11 is a sectional view of the th gate being opened during tool changing of the present invention;

in the figure, 1-knife box, 2-multi-knife rotating device, 3-telescopic-supporting device, 4-pressure maintaining device, 11-upper top plate, 12-lower top plate, 13-left side plate, 13A-left shaft hole of knife shaft, 13B-side plate mud discharging port, 14-right side plate, 14A-right shaft hole of knife shaft, 15-front baffle, 15A-embedded groove, 16-rear baffle, 17-driving motor case, 18-knife hole, 18A-positioning retainer ring, 18B-pressure maintaining chamber, 18C- th sensor, 18D-second sensor, 21-knife changing shaft, 21A-knife shaft mud discharging port, 22-cylindrical roller bearing, 22A-bearing retainer ring, 22B-bearing end cover, 23-slurry discharging channel, 24-stepping motor, 25-transmission system, 31-knife cutter, 32-knife seat, 32A-5636 mud discharging port, 32B-threaded hole, 32C-connecting bolt, 33-slurry discharging sleeve, 33A-inner pipe, 33B-33C-threaded hole, 33C-3548342, 33-knife seat, 33C-knife seat, 32A-5634-gate base seat, 33-3642B-pressure maintaining hydraulic cylinder, 3B-brake, 33B-3641B-hydraulic cylinder, 33-brake, 33B-brake, 33C-brake, 33-hydraulic cylinder brake, 33-3641, 33B-hydraulic cylinder, 33B-3655B-33.

Detailed Description

The technical solution of the present invention is described in detail below in with reference to the accompanying drawings and specific embodiments, which are only for the purpose of illustration and are not intended to limit the present invention.

As shown in fig. 1, fig. 2, fig. 5 and fig. 9, the utility model provides an automatic tool changer for shield constructs quick-witted hobbing cutter that relates to, including toolbox 1, multitool rotary device 2, flexible-strutting arrangement 3 and pressurizer 4, toolbox 1 and shield constructs quick-witted cutter disk panel welding, the toolbox includes roof 11, roof 12, left side board 13, right side board 14, preceding baffle 15, backplate 16, is cuboid boxes promptly to be the hexahedron structure of cavity.

As shown in fig. 1 and 2, the upper surface of the lower top plate 12 is an inclined plane which is high from back to front and low from top to bottom, the front portion of the lower top plate 12 is provided with a slag discharge hole, the left side plate 13 is provided with a cutter shaft left support hole 13A and a side plate mud discharge port 13B, the right side plate 14 is provided with a cutter shaft right support hole 14A, the central region of the front baffle plate 15 is provided with a cutter hole 18, the middle upper portion of the front baffle plate 15 is provided with an embedded groove 15A, the front end of the cutter hole 18 is provided with a positioning check ring 18A, the inner surface of the positioning check ring 18A is provided with an -th sensor 18C, the rear end of the cutter hole 18 is provided with a pressure-holding chamber 18B, and the inner surface of the pressure-.

As shown in fig. 1 and 5, the multi-cutter rotating device 2 comprises a cutter changing shaft 21 and a drive motor case 17 arranged inside the right side plate 14, a stepping motor 24 and a transmission system 25 are arranged in the drive motor case 17, the cutter changing shaft 21 is parallel to the upper top plate 11, two ends of the cutter changing shaft 21 are respectively arranged in a cutter shaft left shaft hole 13A on the left side plate 13 and a cutter shaft right shaft hole 14A on the right side plate 14, pairs of cylindrical roller bearings 22 are respectively arranged between the cutter changing shaft 21 and the left side plate 13 and between the cutter changing shaft 21 and the right side plate 14, namely two ends of the cutter changing shaft 21 are supported in the cutter shaft left supporting hole 13A and the cutter shaft right supporting hole 14A through pairs of cylindrical roller bearings 22, the cylindrical roller bearings 22 are fixed through bearing retainer rings 22A and bearing end covers 22B, a sealing structure is arranged between the cutter changing shaft 21 and the cylindrical roller bearings 22, between the cylindrical roller bearings 22 and the right side plate 14 and the cylindrical roller bearings 22 and the right side plate 14, a slurry discharging hole is arranged in a middle section of the cutter shaft 21, a slurry discharging channel is arranged between the cutter changing shaft 21 and the slurry discharging hole 21, and the slurry discharging hole 21 is arranged along the axial line of the stepping motor case, and the slurry discharging hole of the stepping motor case 21, and the slurry discharging system, and the slurry.

As shown in fig. 1, 3-2, 3-3, 3-4, 5 and 9, the telescopic supporting devices 3 have four groups with the same structure, each telescopic supporting device 3 comprises a cylindrical tool holder 32, a hob 31 is arranged in the tool holder 32, a slurry discharge sleeve 33 is connected to the tool holder 32, the slurry discharge sleeve 33 is provided with a hydraulic cylinder 34 for telescopic movement, and the axes of the tool holder 32, the slurry discharge sleeve 33 and the hydraulic cylinder 34 for telescopic movement are overlapped; a tool apron mud discharging port 32A is formed in the rear end of the tool apron 32, eight tool apron threaded holes 32B are uniformly distributed in the circumferential direction of the tool apron mud discharging port 32A, the tool apron mud discharging port 32A is connected with a front end disc of the telescopic hydraulic cylinder 34 through a connecting bolt 32C, the slurry discharging sleeve 33 comprises an inner pipe 33A and an outer pipe 33B which are nested with each other, and a sealing structure is arranged between the inner pipe 33A and the outer pipe 33B of the slurry discharging sleeve 33; the outer pipe 33B of the slurry discharge casing 33 is fixedly connected with the cutter changing shaft 21, eight inner pipe threaded holes 33C are circumferentially formed in the outer portion of the front end of the inner pipe 33A, the inner pipe 33A is fixedly connected with the telescopic hydraulic cylinder 34, and the inner pipe 33A is in threaded connection with the cutter holder 32. Trade the arbor 21 mid portion and be cavity tetragonal body structure, trade four surfaces of arbor 21 middle cube all set up the arbor mud discharging port 21A, set up mud discharge passage 23 in inside, outer tube 33B rear end with trade arbor 21 middle part mud discharge passage 23 rigid coupling, flexible pneumatic cylinder 34 includes eight, according to 45 distribute in at the interval outer tube 33B front end, flexible pneumatic cylinder 34 is equipped with seal structure. As shown in fig. 9, the four sets of telescopic-supporting devices 3 are uniformly arranged on the cross section of the midpoint of the cutter changing shaft 21 in pairs at 90 degrees and are fixedly connected with the cutter changing shaft 21; the slurry discharge casing 33 is moved in the axial direction by the hydraulic cylinder 34 for expansion and contraction. The mud discharge casing 33 of each set of telescopic-supporting means 3 communicates with the mud discharge channel 23 provided in the middle portion of said arbor 21. The mud discharge line passes through the tool holder 32 → mud discharge sleeve 33 → tool changing shaft mud discharge channel 23 → mud collection device outside the tool box.

As shown in fig. 1 and 2, sets of pressure maintaining devices 4 are arranged in the knife box 1, each pressure maintaining device 4 comprises a gate 041 and a second gate 142, pressure maintaining hydraulic cylinders are respectively connected with the 4 gate 241 and the second gate 342, each pressure maintaining hydraulic cylinder is provided with a sealing structure, the gate 541 is embedded in an embedded groove 15A at the middle upper part of the front baffle 15 and is installed on an gate 6 base 41A, the second gate 742 is installed on the rear surface of the front baffle 15 and is installed on a second gate 8 base 42A, a base stopper 42B is arranged on the upper surface of the second gate base 42A, the gate 41 and the second gate 42 are respectively driven by the pressure maintaining hydraulic cylinders connected with the second gate to be parallel to the front baffle 15, and the second gate 42 is installed on the rear surface of the front baffle 15, and can be driven by the corresponding pressure maintaining hydraulic cylinders to realize the up-and-down movement of the second gate 42 parallel to the front baffle 15.

As shown in fig. 6, when the hob 31 is in an operating state, the hob is positioned by the positioning retainer 18A at the front end of the cutter hole 18 of the front fence 15, the tool rest 32 is locked and pressed by the hydraulic cylinder 34 for extension and contraction, and the locked hydraulic cylinder for extension and contraction can reliably support the reaction force of the excavation face, the gate 41 and the second gate 42 are both in an open state, and the corresponding hydraulic cylinder for pressure maintaining (i.e., the gate hydraulic cylinder 41B or the second gate hydraulic cylinder 42C) is contracted to the extreme position, thereby leaving a space for the extension and contraction supporting device 3.

Utilize the utility model discloses to the process of the automatic tool changing of certain hobbing cutter on the shield constructs the quick-witted blade disc as follows:

as shown in fig. 7, when the working hob is worn to a certain extent and needs to be changed, the cutterhead on which the automatic hob changing device for the shield machine hob of the present invention is installed is stopped, the working sets of the telescopic-supporting device 3 are driven by the telescopic hydraulic cylinder 34 to retract backward along the axis of the cutterhead 32, when the front end of the hob 31 reaches the detection position of the 1 sensor 18C, the telescopic hydraulic cylinder 34 is locked, the telescopic-supporting device 3 stops moving, then the gate 041 is driven by the pressure maintaining hydraulic cylinder 41B of the gate 2 to move downward, when the gate reaches the lower extreme position, the gate is locked by the pressure maintaining hydraulic cylinder 41B, the gate stops moving, that is, the gate is closed, and at this time the 85 isolates the excavation surface from the hob 31.

As shown in fig. 8, when the -th gate 41 reaches the bottom dead center position and the corresponding -th gate 0 holding pressure hydraulic cylinder 41B is locked, the telescopic support device 3 continues to retract rearward along the axis of the holder 32 by the drive of the telescopic hydraulic cylinder 34, when the front end of the rotary knife 31 reaches the detection position of the second sensor 18D, the telescopic support device 3 continues to retract rearward, when the distance of the continued retraction is greater than the plate thickness of the second gate 142, the second gate 42 is moved downward by the drive of the corresponding second gate holding pressure hydraulic cylinder 42C, when the second gate 42 reaches the bottom dead center position, the second gate holding pressure hydraulic cylinder 42C is locked, the second gate 42 stops moving, that is, the second gate 42 is closed, and at this time, the second gate 42 isolates the holding pressure chamber 18B from the rotary knife 31.

As shown in fig. 9, when the second gate 42 reaches the lower extreme position and the hydraulic cylinder 42C for holding pressure of the second gate is locked, the telescopic-support device 3 is further contracted along its axis to be fully retracted, then the cutter changing shaft 21 is driven by the stepping motor 24 to rotate 90 ° counterclockwise (or clockwise) along its axis, the set of telescopic-support devices with the served cutters is rotated to the lower side, the other sets of telescopic-support devices with the non-served cutters mounted thereon are rotated to the tunneling direction, and after the rotation of the cutter changing shaft 21 is completed, the stepping motor 24 stops rotating, and at this time, the axis of the new set of rotary-support devices 3 should coincide with the axis of the cutter hole 18.

As shown in fig. 10, when the cutter shaft 21 completes the rotation operation and the stepping motor 24 stops rotating, the set of telescopic support devices 3 is driven by the set of telescopic hydraulic cylinders 34 to extend forward, when the front end of the hob 31 reaches a position behind the second gate 42, the telescopic hydraulic cylinders 34 are locked, the telescopic support devices 3 stop extending, when the second gate 42 is driven by the second gate pressure maintaining hydraulic cylinder 42C to move upward, when the second gate 42 reaches an upper extreme position, the second gate pressure maintaining hydraulic cylinder 42 is locked, and the second gate 42 stops moving, that is, the second gate 42 is opened.

As shown in fig. 11, when the second gate 42 reaches the upper limit position and the second gate holding pressure cylinder 42C is locked, the telescopic support device 3 is driven by the telescopic cylinder 34 to extend forward along the axis thereof, when the leading end of the rotary knife 31 reaches the detection position of the 1 th sensor 18C, the telescopic cylinder 34 is locked and the telescopic support device 3 stops extending forward, and at this time, the 3 th gate 041 is driven by the th gate 2 holding pressure cylinder 41B to move upward, and when the th gate 441 reaches the upper limit position, the th gate holding pressure cylinder 41B is locked and the th gate stops moving, that is, the th gate 41 is opened.

When the th brake 41 reaches the upper extreme position and the th brake pressure maintaining hydraulic cylinder 41B is locked, the telescopic support device 3 is driven by the telescopic hydraulic cylinder 34 to move forward, when the front end of the tool apron 32 reaches the position of the positioning retainer ring 18A, the telescopic hydraulic cylinder 34 is locked, and the telescopic support device stops extending.

When the hobbing cutter 31 on the second group of telescopic-supporting devices 3 is worn to certain degree and needs to be replaced, the process is repeated, the third group of telescopic-supporting devices can be stretched out to work, when the third group of hobbing cutter also needs to be replaced, the process can be continuously repeated, and the fourth group is replaced, so that the utility model discloses a device can automatically replace the cubic hobbing cutter, the efficiency of construction is improved.

Although the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit of the present invention.

Claims

1, automatic tool changer for shield machine hob, comprising a tool box (1), a multi-tool rotating device (2) and a telescopic-supporting device (3), wherein the tool box (1) is welded with a shield machine tool disc panel, characterized in that:

the cutter box (1) is a cuboid box body consisting of an upper top plate (11), a lower top plate (12), a left side plate (13), a right side plate (14), a front baffle plate (15) and a rear baffle plate (16), wherein the upper surface of the lower top plate (12) is an inclined plane which is high and low from back to front, the front part of the lower top plate (12) is provided with a slag discharge hole, the left side plate (13) is provided with a cutter shaft changing left support hole (13A) and a side plate mud discharge port (13B), the right side plate (14) is provided with a cutter shaft changing right support hole (14A), the central area of the front baffle plate (15) is provided with a cutter hole (18), the middle upper part of the front baffle plate (15) is provided with an embedded groove (15A), the front end of the cutter hole (18) is provided with a positioning check ring (18A), the inner surface of the positioning check ring (18A) is provided with a th sensor (18C), the rear end of the cutter hole (18) is provided with a pressure-keeping chamber (18B), and the inner surface of the;

the multi-cutter rotating device (2) comprises a cutter changing shaft (21) and a driving motor case (17) arranged on the inner side of the right side plate (14), wherein a stepping motor (24) and a transmission system (25) are arranged in the driving motor case (17), two ends of the cutter changing shaft (21) are supported in a cutter changing shaft left supporting hole (13A) and a cutter changing shaft right supporting hole (14A) through pairs of cylindrical roller bearings (22), a slurry discharge channel (23) is arranged in the middle of the cutter changing shaft (21), a slurry discharge hole is arranged in the cutter changing shaft (21), the slurry discharge hole extends from the left end of the cutter changing shaft (21) to the slurry discharge channel (23), and the stepping motor (24) and the transmission system (25) drive the cutter changing shaft (21) to rotate;

the telescopic supporting devices (3) have four groups with the same structure, each group of telescopic supporting devices (3) comprises a cylindrical cutter holder (32), a hob (31) is arranged in each cutter holder (32), a slurry discharge sleeve (33) is connected to each cutter holder (32), each slurry discharge sleeve (33) is provided with a hydraulic cylinder (34) for telescopic use, and the axes of the cutter holders (32), the slurry discharge sleeves (33) and the hydraulic cylinders (34) for telescopic use are superposed; the four groups of telescopic-supporting devices (3) are uniformly distributed on the cross section of the midpoint of the cutter changing shaft (21) in a 90-degree manner in pairs and are fixedly connected with the cutter changing shaft (21); the slurry discharge casing (33) is driven by the telescopic hydraulic cylinder (34) to move along the axial direction; the slurry discharge sleeve (33) in each group of telescopic supporting devices (3) is communicated with a slurry discharge channel (23) arranged at the middle part of the cutter changing shaft (21);

an -sleeve pressure maintaining device (4) is arranged in the knife box (1), the pressure maintaining device (4) comprises a -th brake 1(41) and a second brake 2(42), the 0-th brake 3(41) and the second brake 4(42) are respectively connected with a hydraulic cylinder for pressure maintaining, the -th brake (41) is embedded in an embedded groove (15A) at the middle upper part of the front baffle (15), the second brake (42) is installed on the rear surface of the front baffle (15), the -th brake (41) and the second brake (42) respectively realize the up-and-down movement parallel to the front baffle (15) under the driving of the respectively connected hydraulic cylinders for pressure maintaining, the second brake (42) is installed on the rear surface of the front baffle (15), and the second brake (42) can realize the up-and-down movement parallel to the front baffle (15) under the driving of the corresponding hydraulic cylinders for pressure maintaining.

2. The automatic tool changer for the shield tunneling machine hob according to claim 1, characterized in that the slurry discharge casing (33) comprises an inner pipe (33A) and an outer pipe (33B) which are nested with each other, the tool apron (32) is provided with a tool apron sludge discharge port (32A), the outer portion of the inner pipe (33A) is fixedly connected with the hydraulic cylinder (34) for telescoping, the front end of the outer pipe is fixedly connected with the hydraulic cylinder (34) for telescoping, the rear end of the outer pipe (33B) is fixedly connected with the slurry discharge channel (23) in the middle of the cutter changing shaft (21), and the hydraulic cylinders (34) for telescoping comprise eight parts and are distributed at the front end of the outer pipe (33B) at intervals of 45 degrees.

3. The automatic tool changer for the shield tunneling machine hob according to claim 2, characterized in that the tool apron mud discharge port (32A) is connected with a front end disc of the telescopic hydraulic cylinder (34) through a bolt, and an outer pipe (33B) of the mud discharge sleeve (33) is fixedly connected with the cutter changing shaft (21).

4. The automatic cutter changing device for the shield machine hob according to claim 1, characterized in that sealing structures are arranged between the cutter changing shaft (21) and the cylindrical roller bearing (22), between the cylindrical roller bearing (22) and the left side plate (13), between the cylindrical roller bearing (22) and the right side plate (14), and the hydraulic cylinder (34) for extension and contraction and the hydraulic cylinder for pressure maintaining.

5. The automatic tool changer for shield tunneling machine hobs according to claim 2 or 3, characterized in that a sealing structure is provided between the inner tube (33A) and the outer tube (33B) of the slurry discharge casing (33).