A telescopic shield structure on a heading machine

Abstract

The application relates to the field of heading machines, in particular to a telescopic shield structure on a heading machine, which comprises an inner telescopic shield and an outer telescopic shield, a propelling driving element for telescopic propelling is arranged in the inner telescopic shield, a first guide groove is arranged on the inner telescopic shield, a first guide plate sliding in the first guide groove is arranged on the outer telescopic shield, and the first guide plate abuts against the inner wall of the first guide groove. The application has the effects of reducing the space occupied by the force arm and reducing the manufacturing cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tunneling machine, in particular to a telescopic shield structure on a tunneling machine. BACKGROUND

[0002] The tunneling machine is a machine for digging a tunnel on a flat ground, which is divided into an open type tunneling machine and a shield tunneling machine, and the shield tunneling machine usually comprises logistics equipment and a telescopic shield, the telescopic shield comprises an inner telescopic shield and an outer telescopic shield, a cutter head is rotatably arranged on the inner telescopic shield, and a plurality of oil cylinders are further arranged in the inner telescopic shield, the oil cylinders are used to push the inner telescopic shield to extend, so as to drive the cutter head to advance and dig soil.

[0003] While the oil cylinders push the cutter head, the cutter head is also rotating to dig soil, at this time, the cutter head will generate a torque acting on the inner telescopic shield, and once the inner telescopic shield is driven to rotate by the cutter head, the oil cylinders will be damaged by torsion.

[0004] Now, an arm or a counter-torque oil cylinder is usually added in the outer telescopic shield, the end of the telescopic rod of the arm or the counter-torque oil cylinder is rotatably arranged on the inner telescopic shield, and the telescopic rod of the arm or the counter-torque oil cylinder can only rotate in the telescopic direction of the inner telescopic shield, but cannot rotate in the radial direction of the inner telescopic shield, so that the inner telescopic shield is difficult to rotate under the action of the torque. However, the arm or the counter-torque oil cylinder occupies a large internal space of the telescopic shield, and has a high manufacturing cost. SUMMARY

[0005] In order to solve the problems that the arm occupies a large internal space of the telescopic shield and has a high manufacturing cost, the present application provides a telescopic shield structure on a tunneling machine.

[0006] The present application provides a telescopic shield structure on a tunneling machine, which adopts the following technical scheme:

[0007] The telescopic shield structure on the tunneling machine comprises an inner telescopic shield and an outer telescopic shield, a propelling driving member for telescopic propulsion is arranged in the inner telescopic shield, a first guide groove is formed in the inner telescopic shield, a first guide plate sliding in the first guide groove is arranged on the outer telescopic shield, and the first guide plate abuts against the inner wall of the first guide groove.

[0008] By adopting the above technical scheme, when the inner telescopic shield slides, the sliding of the inner telescopic shield is guided and limited by the cooperation between the first guide plate and the first guide groove, the probability that the inner telescopic shield is rotated under the action of the torque in the propulsion process is reduced, so that the propelling driving member is not damaged by torsion, the cooperation between the first guide plate and the first guide groove simultaneously plays the role of guiding, transmitting torque and limiting rotation, the role of replacing the arm or the counter-torque oil cylinder is achieved, the internal space of the inner telescopic shield is greatly saved, the manufacturing cost is reduced, excellent commercial effects are achieved, and the product competitiveness is improved.

[0009] Optionally, the inner telescopic shield comprises a first inner ring plate and a second inner ring plate, a guide wear plate is arranged on the side wall at the joint of the first inner ring plate and the second inner ring plate, a first flange plate is arranged on the side wall at the joint of adjacent guide wear plates and is connected to each other, and the first guide groove is formed between adjacent guide wear plates.

[0010] By adopting the above technical scheme, the inner telescopic shield is formed by splicing, thereby reducing the difficulty of manufacturing and carrying. The first flange plate is used to realize the flange connection between the first inner ring plate and the second inner ring plate. While the first inner ring plate and the second inner ring plate are flange-connected by the first flange plate, the guide wear plates on the first inner ring plate and the second inner ring plate also form the first guide groove. The flange connection is used to improve the structural strength and reduce the probability of reducing the structural strength of the inner telescopic shield by opening the first guide groove on the side wall of the inner telescopic shield. The machining difficulty of opening the first guide groove on the side wall of the inner telescopic shield is also reduced. The wear caused by sliding friction is reduced by the guide wear plate, thereby prolonging the service life.

[0011] Optionally, the guide wear plate is arranged in an inclined manner, adjacent guide wear plates extend away from each other from the first flange plate, and the shortest distance from the first flange plate to the axis of the inner telescopic shield is greater than the shortest distance from the propelling driving member to the axis of the inner telescopic shield.

[0012] By adopting the above technical scheme, the contact area between the guide wear plate and the first guide plate is increased by the inclined guide wear plate, the pressure during torque transmission is reduced, and the service life is prolonged. At the same time, the size of the first flange plate is limited, the interference of the first flange plate on other equipment inside the inner telescopic shield is reduced, and the utilization rate of the internal space of the inner telescopic shield is improved. In a limited space, the inclined guide wear plate plays a role in transmitting greater torque.

[0013] Optionally, the outer telescopic shield comprises a first outer ring plate and a second outer ring plate, a second flange plate is arranged on the side wall at the joint of the first outer ring plate and the second outer ring plate and is connected to each other, and the first guide plate is arranged on the second flange plate and abuts against the guide wear plate.

[0014] By adopting the technical scheme, the outer telescopic shield is formed by splicing, the manufacturing and carrying difficulty is reduced, the flange connection between the first outer ring plate and the second outer ring plate is realized by the second flange plate, while the first outer ring plate and the second outer ring plate are flange-connected by the first flange plate, the first guide plate is also installed, the flange connection is utilized, the structural strength is improved, meanwhile, the first guide plate is connected to the second flange plate, so that the height of the first guide plate is less than that of the second flange plate, the probability of reducing the internal space of the outer telescopic shield by installing the first guide plate is reduced, the utilization rate of the internal space of the outer telescopic shield is improved, and the available space of the inner telescopic shield is increased.

[0015] Optionally, the inner telescopic shield further comprises a third inner ring plate, the third inner ring plate is clamped between the adjacent second inner ring plates, a second guide plate is arranged on the side wall at the junction of the second inner ring plate and the third inner ring plate, and third flange plates connected to each other are arranged on the side walls adjacent to the second guide plate, the third flange plates on both sides of the third inner ring plate are parallel to each other, so that the third inner ring plate can be taken out or put in along the radial direction of the inner telescopic shield.

[0016] By adopting the technical scheme, when the first inner ring plate and the second inner ring plate are installed, the last splicing is usually the most difficult, since the third flange plates are parallel to each other, the third inner ring plate can be directly put in between the second inner ring plates along the radial direction of the inner telescopic shield to complete the installation, so as to form a complete annular inner telescopic shield side wall, which greatly facilitates the splicing and installation process of the inner telescopic shield and optimizes the processing technology; meanwhile, the second guide plate is also installed when the flange connection between the third inner ring plate and the second inner ring plate is completed, so as to reduce the probability that the second guide plate needs to be installed separately, improve the installation efficiency, and simplify the installation steps.

[0017] Optionally, the outer telescopic shield further comprises a third outer ring plate, the third outer ring plate is clamped between the adjacent second outer ring plates, fourth flange plates connected to each other are arranged on the side walls at the junction of the second outer ring plate and the third outer ring plate, the fourth flange plates on both sides of the third outer ring plate are parallel to each other, so that the third outer ring plate can be taken out or put in along the radial direction of the outer telescopic shield, a second guide groove is formed between the adjacent second guide plates, a third guide plate sliding in the second guide groove is arranged on the fourth flange plate, and the third guide plate abuts against the second guide plate.

[0018] By adopting the technical scheme, when the first outer ring plate and the second outer ring plate are installed, the last piece of splicing is the most difficult as the inner telescopic shield, and since the fourth flange plates are parallel to each other, the third outer ring plate can be directly placed into the second outer ring plate from the inside of the outer telescopic shield along the radial direction of the outer telescopic shield to complete installation, so as to form a complete annular outer telescopic shield sidewall, greatly facilitating the splicing and installation process of the outer telescopic shield and optimizing the processing technology; while the flange connection between the third outer ring plate and the second outer ring plate is completed, the third guide plate is also installed, reducing the probability that the third guide plate needs to be installed separately and improving the installation efficiency and simplifying the installation steps; and the third guide plate slides in the second guide groove, dispersing the torque force transmitted by the first guide plate and the guide wear-resistant plate, further reducing the torque per unit area and prolonging the service life.

[0019] Optionally, the second guide plate comprises a resisting guide plate and a fourth guide plate respectively arranged on both sides of the third flange plate, and the inclination angle of the resisting guide plate is closer to the position of the inner telescopic shield shaft center than the inclination angle of the fourth guide plate.

[0020] By adopting the technical scheme, the resisting guide plate can block more completely when the inner telescopic shield is subjected to torque, and since the inclination angle is not directed to the inner telescopic shield shaft center, the resisting guide plate still has a certain guiding effect, reducing the probability that the torque direction is perpendicular to the side wall of the resisting guide plate and easily damaging the resisting guide plate, and prolonging the service life of the resisting guide plate.

[0021] Optionally, the second guide plate further comprises a resisting plate arranged on the third inner ring plate, and the resisting plate is parallel to the third flange plate.

[0022] By adopting the technical scheme, the resisting plate and the resisting guide plate are matched, so that the torque makes the inner telescopic shield rotate in any direction, and the surface with a larger inclination angle is used for resisting, so that the torque transmission to the inner telescopic shield is more complete, and the probability of rotation of the inner telescopic shield is further reduced.

[0023] Optionally, the third guide plate comprises a first wear-resistant plate and a second wear-resistant plate arranged on both sides of the fourth flange plate, the first wear-resistant plate is slidably attached to the resisting guide plate, and the second wear-resistant plate is slidably attached to the fourth guide plate.

[0024] By adopting the technical scheme, the first wear-resistant plate and the abutting guide plate slide in conjunction, the second wear-resistant plate and the fourth guide plate slide in conjunction, the contact area during transmission is increased, the pressure is reduced, especially the conjunction of the first wear-resistant plate and the abutting guide plate, because the inclination angle of the abutting guide plate is large, the abutting guide plate receives larger torque during transmission compared with the fourth guide plate, at this time, the contact area is increased, the pressure is greatly reduced, and the service life is prolonged; meanwhile, the abrasion caused by sliding friction is reduced through the first wear-resistant plate, the second wear-resistant plate, the abutting guide plate and the fourth guide plate, and the service life is further prolonged.

[0025] Optionally, the third guide plate further comprises a third wear-resistant plate arranged on the third outer ring plate, and the third wear-resistant plate is in conjunction with the abutting plate.

[0026] By adopting the technical scheme, the third wear-resistant plate and the abutting plate are in conjunction, because the inclination angle of the abutting plate is large, the abutting plate receives larger torque during transmission, at this time, the contact area is increased, the pressure is greatly reduced, and the service life is prolonged; and the abrasion caused by sliding friction is reduced through the third wear-resistant plate and the abutting plate, and the service life is further prolonged.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. The cooperation of the first guide plate and the first guide groove simultaneously plays the role of guiding and transmitting torque to limit rotation, achieves the role of replacing the force arm or the counter-torque oil cylinder, greatly saves the internal space of the internal telescopic shield, simultaneously reduces the manufacturing cost, plays an excellent commercial role, and improves the product competitiveness.

[0029] 2. The flange connection is used, the structural strength is improved, the probability that the first guide groove is arranged on the side wall of the internal telescopic shield is reduced, the structural strength of the internal telescopic shield is reduced, and the machining difficulty of the first guide groove arranged on the side wall of the internal telescopic shield is reduced.

[0030] 3. Meanwhile, the abrasion caused by sliding friction is also reduced, and the service life is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a whole structure schematic view of an internal telescopic shield structure in the embodiment of the present application.

[0032] Figure 2 is a structure schematic view of an external telescopic shield.

[0033] Figure 3 is a structure schematic view of an internal telescopic shield.

[0034] Figure 4 is Figure 3 is an enlarged structure schematic view of position A in FIG. 8.

[0035] Figure 5 is Figure 3 Amplification structure diagram at B in the middle.

[0036] Figure 6 is along Figure 3 Sectional view diagram along C-C line in the middle.

[0037] Figure 7 is along Figure 2 Sectional view diagram along D-D line in the middle.

[0038] Reference signs: 1, inner telescopic shield; 11, first guide groove; 111, pushing driving part; 112, guide wear-resistant plate; 12, first inner ring plate; 13, second inner ring plate; 14, first flange plate; 141, reinforcing rib; 15, third inner ring plate; 2, outer telescopic shield; 21, first guide plate; 211, abutting ring; 22, first outer ring plate; 23, second outer ring plate; 24, second flange plate; 25, third outer ring plate; 3, second guide plate; 31, second guide groove; 32, third flange plate; 33, abutting guide plate; 34, fourth guide plate; 35, abutting plate; 4, fourth flange plate; 41, third guide plate; 411, first wear-resistant plate; 412, second wear-resistant plate; 413, third wear-resistant plate. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying Figures 1-7 Further detailed description is made to the present application.

[0040] The embodiment of the present application discloses a telescopic shield structure on a heading machine. Referring to Figure 1 , the telescopic shield structure on the heading machine comprises an inner telescopic shield 1 and an outer telescopic shield 2, a cutter head for digging soil is rotatably installed on the end of the inner telescopic shield 1, the inner telescopic shield 1 is sleeved and slid in the inner part of the outer telescopic shield 2, the outer circumferential sidewall of the inner telescopic shield 1 is attached to the inner circumferential sidewall of the outer telescopic shield 2, and the inner wall of the inner telescopic shield 1 is fixedly connected with pushing driving parts 111 for telescopic pushing, in the embodiment, the pushing driving parts 111 are pushing oil cylinders, and the number of the pushing driving parts 111 is ten, and the ten pushing driving parts 111 are distributed in a circumferential ring on the inner wall of the inner telescopic shield 1.

[0041] Referring to Figure 1 and Figure 2 , the inner circumferential sidewall of the outer telescopic shield 2 is fixedly connected with an abutting ring 211, and the telescopic rods of the pushing driving parts 111 abut on the abutting ring 211 to push the outer telescopic shield 2 and the inner telescopic shield 1.

[0042] Referring to Figure 2 and Figure 3The first guide slot 11 is arranged on the side wall of the inner telescopic shield 1, and the first guide plate 21 is arranged on the side wall of the outer telescopic shield 2 and slides in the first guide slot 11.

[0043] With reference to Figure 3 And Figure 4 The inner telescopic shield 1 comprises a first inner ring plate 12 and two second inner ring plates 13, and the two second inner ring plates 13 sandwich the first inner ring plate 12. The end side wall of the first inner ring plate 12 at both ends is fixedly connected with the end side wall of the second inner ring plate 13 close to the first inner ring plate 12. The end side wall at the joint of adjacent guide wear plates 112 is fixedly connected with the first flange plate 14. Adjacent first flange plates 14 are fixedly connected by bolts. The first guide slot 11 is formed between the outer side walls of adjacent guide wear plates 112.

[0044] With reference to Figure 1 And Figure 3 The length of the first flange plate 14 extends along the length direction of the inner telescopic shield 1. The width direction of the first flange plate 14 extends towards the direction close to the axis of the inner telescopic shield 1. The shortest distance between the side wall of the first flange plate 14 towards the axis of the inner telescopic shield 1 and the axis of the inner telescopic shield 1 is greater than the shortest distance between the pushing driving part 111 and the axis of the inner telescopic shield 1.

[0045] With reference to Figure 4 The first flange plate 14 is fixedly connected with the reinforcing rib 141. One end of the reinforcing rib 141 is fixedly connected with the side wall of the first flange plate 14. The reinforcing rib 141 is also fixedly connected with the guide wear plate 112. The other end of the reinforcing rib 141 is fixedly connected with the corresponding first inner ring plate 12 or second inner ring plate 13. The height of the reinforcing rib 141 is lower than the width of the first flange plate 14.

[0046] With reference to Figure 3 And Figure 4 The guide wear plate 112 is arranged in an inclined manner. The guide wear plate 112 on the side of the first inner ring plate 12 farther away from the first inner ring plate 12 is closer to the axis of the inner telescopic shield 1. The guide wear plate 112 on the side wall of the second inner ring plate 13 farther away from the second inner ring plate 13 is closer to the axis of the inner telescopic shield 1. That is, the adjacent guide wear plates 112 extend in the direction away from each other from the first flange plate 14.

[0047] With reference to Figure 3The inner telescopic shield 1 also includes a third inner ring plate 15, with two second inner ring plates 13 sandwiching the third inner ring plate 15 in the middle. That is, one end of the second inner ring plate 13 is connected to the first inner ring plate 12, and the other end of the second inner ring plate 13 is connected to the third inner ring plate 15. The end sidewalls of both ends of the third inner ring plate 15 and the end sidewalls of the second inner ring plate 13 near the third inner ring plate 15 are all fixedly connected with second guide plates 3.

[0048] Reference Figure 5 and Figure 6 A third flange plate 32 is installed on the end side wall at the junction of adjacent second guide plates 3. The third flange plates 32 on both sides of the third inner ring plate 15 and the third flange plates 32 on the ends of the two second inner ring plates 13 are all parallel to each other. The length direction of the third flange plate 32 extends along the length direction of the inner telescopic shield 1, and the width direction of the third flange plate 32 is parallel to the radial line of the inner telescopic shield 1 pointing from the center of the third inner ring plate 15 to the axis of the inner telescopic shield 1, so that the third inner ring plate 15 can be taken out or put in along the radial direction of the inner telescopic shield 1.

[0049] Reference Figure 5 The second guide plate 3 includes an abutting guide plate 33 and a fourth guide plate 34, which are respectively fixedly connected to both sides of the third flange plate 32. One end of the abutting guide plate 33 is fixedly connected to the side wall of the third flange plate 32 facing the second inner ring plate 13, and the other end of the abutting guide plate 33 is fixedly connected to the end side wall of the second inner ring plate 13 near the third inner ring plate 15.

[0050] Reference Figure 3 and Figure 5 The second guide plate 3 also includes an abutment plate 35 fixedly connected to the third inner ring plate 15. The length direction of the abutment plate 35 extends along the length direction of the inner telescopic shield 1, while the width direction of the abutment plate 35 extends towards the axis of the inner telescopic shield 1, and the abutment plate 35 is parallel to the third flange plate 32. One end of the fourth guide plate 34 is fixedly connected to the side wall of the third flange plate 32 facing the third inner ring plate 15, and the other end of the fourth guide plate 34 is fixedly connected to the end side wall of the abutment plate 35 away from the third inner ring plate 15. The inclination angle of the abutment guide plate 33 is closer to the axis of the inner telescopic shield 1 than the inclination angle of the fourth guide plate 34.

[0051] Reference Figure 2The outer telescopic shield 2 includes a first outer ring plate 22 and two second outer ring plates 23, with the two second outer ring plates 23 sandwiching the first outer ring plate 22 in the middle. Second flange plates 24 are fixedly connected to the end sidewalls of both ends of the first outer ring plate 22 and the end sidewalls of the second outer ring plates 23 near the first outer ring plate 22. Adjacent second flange plates 24 are fixedly connected by bolts. The length direction of the second flange plates 24 extends along the length direction of the outer telescopic shield 2, and the width direction of the second flange plates 24 extends towards the axis of the outer telescopic shield 2. The width of the second flange plates 24 is smaller than the width of the contact ring 211, and the ends of the second flange plates 24 are fixedly connected to the sidewalls of the contact ring 211.

[0052] Reference Figure 2 and Figure 4 One end of the first guide plate 21 is fixedly connected to the side wall of the second flange plate 24, while the other end of the first guide plate 21 is fixedly connected to the inner side wall of the first outer ring plate 22 or the second outer ring plate 23. The first guide plate 21 is inclined, and the inclination angle of the first guide plate 21 is the same as that of the guide wear-resistant plate 112, so that the side wall of the first guide plate 21 facing the axis of the outer telescopic shield 2 fits against the outer side wall of the guide wear-resistant plate 112 facing away from the axis of the inner telescopic shield 1.

[0053] Reference Figure 2 and Figure 7 The outer telescopic shield 2 also includes a third outer ring plate 25, with two second outer ring plates 23 sandwiching the third outer ring plate 25 in the middle. One end of the second outer ring plate 23 is connected to the first outer ring plate 22, and the other end of the second outer ring plate 23 is connected to the third outer ring plate 25. Fourth flange plates 4 are fixedly connected to the end sidewalls of both ends of the third outer ring plate 25 and the end sidewalls of the second outer ring plates 23 near the third outer ring plate 25. Adjacent fourth flange plates 4 are fixedly connected by bolts. The length of the fourth flange plate 4 extends along the length of the outer telescopic shield 2, and the width of the fourth flange plate 4 is parallel to the width of the third flange plate 32, allowing the third outer ring plate 25 to be removed or inserted radially along the outer telescopic shield 2.

[0054] Reference Figure 2 and Figure 3 and Figure 6 A second guide groove 31 is formed between the abutting guide plates 33 and 35 on one side of the third inner ring plate 15 and the fourth guide plate 34, while another second guide groove 31 is formed between the abutting guide plates 33 and 35 on the other side of the third inner ring plate 15 and the fourth guide plate 34. A third guide plate 41 is installed on the fourth flange plate 4 and slides within the second guide groove 31, with the third guide plate 41 abutting against and abutting against the second guide plate 3.

[0055] Reference Figure 6 and Figure 7The third guide plate 41 comprises a first wear plate 411 and a second wear plate 412 fixedly connected on both sides of the fourth flange plate 4. One end of the first wear plate 411 is fixedly connected on the side wall of the fourth flange plate 4 facing the second outer ring plate 23, and the other end of the first wear plate 411 is fixedly connected on the inner ring side wall of the second outer ring plate 23 close to the third outer ring plate 25, so that the first wear plate 411 is in sliding contact with the abutting guide plate 33. One end of the second wear plate 412 is fixedly connected on the side wall of the fourth flange plate 4 facing the third outer ring plate 25, so that the second wear plate 412 is in sliding contact with the fourth guide plate 34.

[0056] With reference to Figure 6 With reference to Figure 7 The third guide plate 41 further comprises a third wear plate 413 fixedly connected on the third outer ring plate 25. One end of the third wear plate 413 is fixedly connected on the inner ring side wall of the third outer ring plate 25 close to the second outer ring plate 23, and the other end of the third wear plate 413 is fixedly connected on the end side wall of the second wear plate 412 away from the fourth flange plate 4, so that the third wear plate 413 is in sliding contact with the abutting plate 35.

[0057] In the embodiment, the guide wear plate 112, the first guide plate 21, the second wear plate 412, the abutting guide plate 33 and the fourth guide plate 34 are made of Hardox450 wear plate.

[0058] The implementation principle of the telescopic shield structure of the boring machine is as follows: when the advancing driving member 111 drives the inner telescopic shield 1 to advance the cutter head, the cutter head also rotates to dig soil. At this time, the torque generated by the cutter head acts on the side wall of the inner telescopic shield 1. At this time, the torque on the inner telescopic shield 1 is transmitted to the outer telescopic shield 2 through the abutting contact of the first guide plate 21 and the guide wear plate 112, the abutting contact of the abutting guide plate 33 and the first wear plate 411, the abutting contact of the fourth guide plate 34 and the second wear plate 412, and the abutting contact of the abutting plate 35 and the third wear plate 413, so that the inner telescopic shield 1 is difficult to rotate.

[0059] At this time, the inner telescopic shield 1 slides out in the outer telescopic shield 2, the first guide plate 21 slides in the first guide groove 11, and the third guide plate 41 slides in the second guide groove 31, which simultaneously realizes the transmission of the torque and the guidance of the sliding direction of the inner telescopic shield 1.

[0060] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape and principle of the present application should be covered by the protection scope of the present application.

Claims

1. A telescopic shield structure on a tunneling machine, comprising an inner telescopic shield (1) and an outer telescopic shield (2), a propelling drive (111) for telescopic propulsion is arranged in the inner telescopic shield (1), characterized in that: The inner telescopic shield (1) is provided with a first guide groove (11), the outer telescopic shield (2) is provided with a first guide plate (21) sliding in the first guide groove (11), the first guide plate (21) abuts against the inner wall of the first guide groove (11), the inner telescopic shield (1) comprises a first inner ring plate (12) and a second inner ring plate (13), the side wall at the joint of the first inner ring plate (12) and the second inner ring plate (13) is provided with a guide wear plate (112), the side wall at the joint of adjacent guide wear plates (112) is provided with a first flange plate (14) connected with each other, the first guide groove (11) is formed between adjacent guide wear plates (112), the guide wear plates (112) are arranged in an inclined manner, adjacent guide wear plates (112) extend away from each other from the first flange plate (14), the shortest distance from the first flange plate (14) to the axis of the inner telescopic shield (1) is greater than the shortest distance from the driving member (111) to the axis of the inner telescopic shield (1), the outer telescopic shield (2) comprises a first outer ring plate (22) and a second outer ring plate (23), the side wall at the joint of the first outer ring plate (22) and the second outer ring plate (23) is provided with a second flange plate (24) connected with each other, the first guide plate (21) is arranged on the second flange plate (24), and the first guide plate (21) abuts against the guide wear plate (112).

2. The telescopic shield structure on a heading machine according to claim 1, characterized in that: The inner telescopic shield (1) further comprises a third inner ring plate (15), adjacent second inner ring plates (13) sandwich the third inner ring plate (15), the side wall at the joint of the second inner ring plate (13) and the third inner ring plate (15) is provided with a second guide plate (3), the side wall of adjacent second guide plates (3) is provided with a third flange plate (32) connected with each other, the third flange plates (32) on both sides of the third inner ring plate (15) are parallel to each other, so that the third inner ring plate (15) can be taken out or put in along the radial direction of the inner telescopic shield (1).

3. A telescopic shield structure on a heading machine according to claim 2, characterized in that: The outer telescopic shield (2) further comprises a third outer ring plate (25), adjacent second outer ring plates (23) sandwich the third outer ring plate (25), the side wall at the joint of the second outer ring plate (23) and the third outer ring plate (25) is provided with a fourth flange plate (4) connected with each other, the fourth flange plates (4) on both sides of the third outer ring plate (25) are parallel to each other, so that the third outer ring plate (25) can be taken out or put in along the radial direction of the outer telescopic shield (2), a second guide groove (31) is formed between adjacent second guide plates (3), the fourth flange plate (4) is provided with a third guide plate (41) sliding in the second guide groove (31), and the third guide plate (41) abuts against the second guide plate (3).

4. The telescopic shield structure on a heading machine according to claim 3, characterized in that: The second guide plate (3) comprises an abutting guide plate (33) and a fourth guide plate (34) arranged on both sides of the third flange plate (32) respectively, and the inclination angle of the abutting guide plate (33) is closer to the position of the axis of the inner telescopic shield (1) than the inclination angle of the fourth guide plate (34).

5. The telescopic shield structure on a heading machine according to claim 3, characterized in that: The second guide plate (3) further comprises a contact plate (35) arranged on the third inner ring plate (15), and the contact plate (35) is parallel to the third flange plate (32).

6. The telescopic shield structure on a heading machine according to claim 4, characterized in that: The third guide plate (41) comprises a first wear-resistant plate (411) and a second wear-resistant plate (412) arranged on both sides of the fourth flange plate (4), the first wear-resistant plate (411) is slidably attached to the contact guide plate (33), and the second wear-resistant plate (412) is slidably attached to the fourth guide plate (34).

7. The telescopic shield structure on a heading machine according to claim 5, characterized in that: The third guide plate (41) further comprises a third wear-resistant plate (413) arranged on the third outer ring plate (25), and the third wear-resistant plate (413) is attached to the contact plate (35).

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