Single-spindle tube push bench power device and control device thereof

Abstract

The utility model discloses a single spindle type tube push bench power device which comprises a hydraulic motor, a speed reducer, a spindle and a cutter taper sleeve, the power output end of the hydraulic motor is fixedly connected with the input shaft end of the speed reducer, the output shaft end of the speed reducer is fixedly connected with one end of the spindle, and the end, away from the speed reducer, of the spindle is connected with the cutter taper sleeve in an interference fit mode. A slewing bearing is arranged on the main shaft, two ends of the slewing bearing are respectively and fixedly connected with a rear sealing seat and a front sealing seat, the rear sealing seat and the front sealing seat are respectively and rotatably connected with the main shaft, a lubricating subsystem is arranged among the rear sealing seat, the main shaft and the slewing bearing, and a high-pressure water supply subsystem is arranged among the rear sealing seat, the main shaft and the cutterhead taper sleeve. The power device installation structure is convenient to install, high in installation precision, small in vibration, attractive in appearance, high in working efficiency, simple in structure, capable of saving space, low in rotating speed, high in torque, long in service life and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of power drive of pipe jacking machines, in particular to a power device of a single-spindle type pipe jacking machine and a control device thereof. Background Art

[0002] At present, the power device of the single-spindle pipe jacking machine is composed of a large gear, a small gear, a reducer, a motor, a main shaft, multiple thrust spherical roller bearings and cylindrical roller bearings, etc. The motor drives the reducer to drive the small gear to rotate, thereby driving the large gear to realize the rotation of the main shaft. However, the power device in the prior art has a complex structure, a large manufacturing volume, a complex process, and an unstable working condition, resulting in low working efficiency. Utility Model Content

[0003] The utility model aims to provide a single-spindle pipe jacking machine power device and a control device thereof, which are used to solve the problem of poor operation and application effect of the power device in the prior art.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A single-spindle pipe jacking machine power device and a control device thereof, comprising a hydraulic motor, a reducer, a spindle and a cutter disc taper sleeve, wherein the power output end of the hydraulic motor is fixedly connected to the input shaft end of the reducer, the output shaft end of the reducer is fixedly connected to one end of the spindle, and the end of the spindle away from the reducer is connected to the cutter disc taper sleeve by interference fit;

[0006] The main shaft is provided with a slewing bearing, the two ends of which are respectively fixedly connected to the rear sealing seat and the front sealing seat, and the rear sealing seat and the front sealing seat are respectively rotatably connected to the main shaft;

[0007] Wherein, a lubrication subsystem is arranged between the rear sealing seat, the main shaft and the slewing bearing, and a high-pressure water supply subsystem is arranged between the rear sealing seat, the main shaft and the cutter disc cone sleeve.

[0008] As a further solution of the utility model: the two ends of the main shaft are respectively arranged as a torque input end and a torque output end, and the main shaft is respectively provided with a rear sealing shaft block, an assembly shaft block, a docking shaft block and a front sealing shaft block in the radial direction from the torque input end to the torque output end, and the diameter of the shaft block is gradually decreased in the radial direction from the docking shaft block to the torque input end, and the diameter of the shaft block is gradually decreased in the radial direction from the docking shaft block to the torque output end.

[0009] As a further solution of the utility model: the lubrication subsystem includes a lubricating grease channel, the lubricating grease channel is opened along the axial direction of the rear sealing body included in the rear sealing seat, and a rear sealing sleeve portion of an integral structure is provided at the center position of the rear sealing body, and the rear sealing sleeve portion is rotatably connected to the rear sealing shaft platform;

[0010] Wherein, the tail end of the lubricating grease channel is branched to the contact surface between the rear sealing sleeve and the rear sealing shaft platform.

[0011] As a further solution of the utility model: the high-pressure water supply subsystem includes a high-pressure water inlet channel, which is opened axially along the rear sealing body, and the tail end of the high-pressure water inlet channel is connected with the central axis hole of the rear sealing sleeve. A main shaft water inlet hole connected with the high-pressure water inlet channel is opened on the outer wall of the rear sealing shaft platform, and the main shaft water inlet hole is connected to the main shaft docking axis hole of the front main shaft through the hollow axis hole of the main shaft. The main shaft docking axis hole is connected to a plurality of main shaft diversion channels opened axially on the front main shaft, and the main shaft diversion channel is connected to the diversion water outlet channel opened on the cutter disc cone sleeve.

[0012] As a further solution of the utility model: a cone sleeve avoidance groove and a dead plate embedding groove are respectively opened on both sides of the cutter disc cone sleeve, the cone sleeve avoidance groove is used to insert the end of the front sealing shaft platform, the dead plate embedding groove is used to embed the front dead plate, and a conical shaft hole is provided between the cone sleeve avoidance groove and the dead plate embedding groove, and the conical shaft hole is used to adapt and connect the conical torque output end.

[0013] As a further solution of the utility model: the central shaft hole of the slewing bearing is used to adapt and connect to the assembly pillow block, and the inner ring end surface wall of the slewing bearing is fixedly connected to the docking pillow block.

[0014] As a further solution of the utility model: the front seal seat includes a front seal body, a front seal sleeve portion with an integrated structure is provided at the center position of the front seal body, the central axis hole of the front seal sleeve portion is rotatably connected to the front seal shaft platform, and a front seal avoidance groove is opened on the front seal body, and the front seal avoidance groove is used to insert the end of the docking shaft platform.

[0015] As a further solution of the utility model: the torque input end is cylindrical, and the cylindrical torque input end is connected to the output shaft end of the reducer through a spline adapter.

[0016] As a further solution of the utility model: the hydraulic motor is installed on the reducer through a docking flange integrated structure.

[0017] A control device for a power device of a single-spindle pipe jacking machine as described above is used, comprising a main control system and a power subsystem, a lubrication subsystem and a high-pressure water supply subsystem electrically connected to the main control system respectively;

[0018] The power subsystem includes a hydraulic motor, a reducer, a main shaft and a cutter cone sleeve which are sequentially connected in transmission; the lubrication subsystem is used to provide oil to the main shaft so that the power subsystem can achieve stable oil circuit lubrication; the high-pressure water supply subsystem is used to provide high-pressure water to the diversion water outlet channel opened on the cutter cone sleeve so that the power subsystem can achieve stable excavation soil pressure balance.

[0019] Beneficial effects of the utility model:

[0020] (1) The power device of the present application provides power output torque through a hydraulic motor, and the torque is reduced by a reducer and then output through the mechanical torque of the main shaft, so that a single hydraulic motor can directly drive the main shaft, which can effectively prevent energy loss during movement;

[0021] (2) The rotating bearing position on the main shaft is designed as a slewing bearing, which can replace the traditional use of multiple bearings to support the main shaft, and can effectively solve the problem of insufficient installation space;

[0022] (3) During the installation and use of the components of the power device of the present application, the lubrication subsystem can lubricate the rotational position of the main shaft and the slewing bearing to ensure the rotational stability. By arranging the rear sealing seat and the front sealing seat on both sides of the slewing bearing, the main shaft torque rotation stability can be ensured while avoiding the overflow of lubricating grease;

[0023] (4) During the installation and use of the components of the power device of the present application, the high-pressure water supply subsystem can supply high-pressure water to the cutter disc installed on the cutter disc cone sleeve, solving the cutter disc water supply problem. At the same time, when used in conjunction with the lubrication subsystem, the spindle lubrication rotation is stable and the spindle speed is consistent. The high-pressure water supply subsystem autonomously supplies water to the cutter disc evenly and consistently, ensuring the quality of excavation construction;

[0024] (5) During the installation and use of the components of the power device of the present application, the cutter head sleeve is installed with the main shaft through the tapered shaft hole. During the jacking process, the cutter head sleeve and the main shaft can be more and more closely matched, ensuring the concentricity between the cutter head sleeve and the main shaft, and ensuring the torque connection stability between the two.

[0025] (6) The power device installation structure of the present application is easy to install and has high installation accuracy. It has the advantages of small vibration, beautiful appearance, high working efficiency, simple structure, space saving, low speed and high torque, and long service life;

[0026] (7) This control device is used to control the power subsystem, lubrication subsystem and high-pressure water supply subsystem in linkage through the main control system, so that the power subsystem can achieve stable oil circuit lubrication; so that the power subsystem can achieve stable excavation soil pressure balance and meet the needs of the automated process control device for on-site construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The utility model is further described below in conjunction with the accompanying drawings.

[0028] Figure 1 It is a structural schematic diagram of the utility model;

[0029] Figure 2 It is a schematic diagram of the main shaft structure of the utility model;

[0030] Figure 3 It is a schematic cross-sectional view of the cutter cone sleeve of the utility model;

[0031] Figure 4 It is a schematic cross-sectional view of the slewing bearing of the utility model;

[0032] Figure 5 It is a cross-sectional schematic diagram of the rear sealing seat of the utility model;

[0033] Figure 6 It is a schematic cross-sectional view of the front sealing seat of the utility model;

[0034] Figure 7 It is a schematic cross-sectional view of the front panel of the utility model;

[0035] Figure 8 It is a schematic diagram of the structure of the hydraulic motor of the utility model;

[0036] Fig. 9 It is a schematic diagram of the structure of the reducer of the utility model;

[0037] Fig.10 It is a cross-sectional schematic diagram of the butt flange of the utility model;

[0038] Fig.11 It is a flow chart of the control device of the utility model.

[0039] In the figure: 1. hydraulic motor; 2. reducer; 3. main shaft; 30. torque input end; 31. torque output end; 32. rear sealing shaft block; 320. main shaft water inlet hole; 33. assembly shaft block; 34. docking shaft block; 35. front sealing shaft block; 4. cutter head cone sleeve; 40. cone sleeve avoidance groove; 41. dead plate embedded groove; 42. tapered shaft hole; 43. diversion water outlet channel; 5. slewing bearing; 6. rear sealing seat; 60. rear sealing body; 61. rear sealing sleeve; 62. grease channel; 63. high-pressure water inlet channel; 7. front sealing seat; 70. front sealing body; 71. front sealing sleeve; 72. front sealing avoidance groove; 8. front dead plate; 80. dead plate docking shaft hole; 81. dead plate diversion channel; 9. docking flange. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in the description of the present invention, "multiple" and "several" mean at least two, for example two, three, etc., unless otherwise clearly and specifically defined.

[0042] See also Figure 1 As shown, the utility model is a single-spindle pipe jacking machine power device, including a hydraulic motor 1, a reducer 2, a main shaft 3 and a cutter disc cone sleeve 4, the power output end of the hydraulic motor 1 is fixedly connected to the input shaft end of the reducer 2, the output shaft end of the reducer 2 is fixedly connected to one end of the main shaft 3, the end of the main shaft 3 away from the reducer 2 is connected to the cutter disc cone sleeve 4 by interference fit, a slewing bearing 5 is arranged on the main shaft 3, the two ends of the slewing bearing 5 are respectively fixedly connected to the rear sealing seat 6 and the front sealing seat 7, the rear sealing seat 6 and the front sealing seat 7 are respectively rotatably connected to the main shaft 3, wherein a lubrication subsystem is arranged between the rear sealing seat 6, the main shaft 3 and the slewing bearing 5, and a high-pressure water supply subsystem is arranged between the rear sealing seat 6, the main shaft 3 and the cutter disc cone sleeve 4.

[0043] The power device of the present application provides power output torque through the hydraulic motor 1, and the torque is reduced by the reducer 2 and then output through the mechanical torque of the main shaft 3, so that a single hydraulic motor 1 can directly drive the main shaft 3, which can effectively prevent energy loss during movement; the rotating bearing position on the main shaft 3 is designed as a slewing support 5, which can replace the traditional use of multiple bearings to perform the role of slewing support 5 on the main shaft 3, and can effectively solve the problem of insufficient installation space; during the installation and use of the various component structures of the power device of the present application, the lubrication subsystem set up can lubricate the rotation position of the main shaft 3 and the slewing support 5 to ensure rotation stability, and by setting a rear sealing seat 6 and a front sealing seat 7 on both sides of the slewing support 5, the torque rotation stability of the main shaft 3 can be ensured, and the overflow of lubricating grease can be avoided; in addition, the set high-pressure water supply subsystem can supply high-pressure water to the cutter disc installed on the cutter disc cone sleeve 4, solving the cutter disc water supply problem.

[0044] The power device installation structure of the present application is easy to install and has high installation accuracy. It has the advantages of small vibration, beautiful appearance, high working efficiency, simple structure, space saving, low speed and high torque, and long service life.

[0045] In this specific implementation mode, Figure 2 As shown, the two ends of the main shaft 3 are respectively set as the torque input end 30 and the torque output end 31, and the main shaft 3 is respectively provided with a rear sealing shaft block 32, an assembly shaft block 33, a docking shaft block 34 and a front sealing shaft block 35 in the radial direction from the torque input end 30 to the torque output end 31. The diameters of the shaft blocks in the radial direction from the docking shaft block 34 to the torque input end 30 are arranged in decreasing order, and the diameters of the shaft blocks in the radial direction from the docking shaft block 34 to the torque output end 31 are arranged in decreasing order. The torque input end 30, the rear sealing shaft block 32, the assembly shaft block 33, the docking shaft block 34, the front sealing shaft block 35 and the torque input end 30 are designed in sequence along the radial direction of the main shaft 3 to facilitate adaptation, installation and use, ensure the stable rotation of the main shaft 3, and facilitate lubrication of its rotating connection position.

[0046] In this specific implementation mode, Figure 2 and Figure 5As shown, the lubrication subsystem includes a grease channel 62, which is opened axially along the rear sealing body 60 included in the rear sealing seat 6, and a rear sealing sleeve portion 61 of an integral structure is provided at the center position of the rear sealing body 60, and the rear sealing sleeve portion 61 is rotatably connected to the rear sealing shaft platform 32, wherein the rear end of the grease channel 62 is diverted to the contact surface between the rear sealing sleeve portion 61 and the rear sealing shaft platform 32; during use of the lubrication subsystem, grease is input through the grease channel 62 opened on the rear sealing body 60, and the grease is diverted to the contact surface between the rear sealing sleeve portion 61 and the rear sealing shaft platform 32 through the rear end of the grease channel 62, thereby realizing lubrication of the rotating connection position between the main shaft 3 and the slewing support 5.

[0047] In this specific implementation mode, Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, the high-pressure water supply subsystem includes a high-pressure water inlet channel 63, which is opened axially along the rear sealing body 60, and the tail end of the high-pressure water inlet channel 63 is connected to the central axis hole of the rear sealing sleeve 61. A main shaft water inlet hole 320 connected to the high-pressure water inlet channel 63 is opened on the outer wall of the rear sealing shaft platform 32, and the main shaft water inlet hole 320 is connected to the main shaft docking axis hole 80 of the front main shaft 8 through the hollow axis hole of the main shaft 3. The main shaft docking axis hole 80 is connected to a plurality of main shaft shunt channels 81 opened axially on the front main shaft 8, and the main shaft shunt channels 81 are connected to the cutter head cone sleeve. 4 is connected with the diversion water outlet channel 43 opened on the cutter disc cone sleeve 4; during the use of the high-pressure water supply subsystem, high-pressure water is input through the high-pressure water inlet channel 63 opened on the rear sealing body 60. When the main shaft 3 rotates, the high-pressure water intermittently enters the main shaft water inlet hole 320 of the main shaft 3, and is transported to the boring plate docking shaft hole 80 through the hollow shaft hole of the main shaft 3, and is diverted to the boring plate diversion channel 81 until it reaches the diversion water outlet channel 43 opened on the cutter disc cone sleeve 4 and is discharged. It can realize the supply of high-pressure water to the cutter disc installed on the cutter disc cone sleeve 4, solving the problem of water supply to the cutter disc.

[0048] In this specific implementation mode, Figure 2 and Figure 3As shown, a cone sleeve avoidance groove 40 and a blind plate embedding groove 41 are respectively provided on both sides of the cutter disc cone sleeve 4. The cone sleeve avoidance groove 40 is used to insert the end of the front sealing shaft platform 35, and the blind plate embedding groove 41 is used to embed the front blind plate 8. A tapered shaft hole 42 is provided between the cone sleeve avoidance groove 40 and the blind plate embedding groove 41. The tapered shaft hole 42 is used to adapt to the cone-shaped torque output end 31. The front blind plate 8 embedded on the cutter disc cone sleeve 4 is used to seal and block the torque output end 31 of the main shaft 3. The cutter disc cone sleeve 4 is installed with the main shaft 3 through the tapered shaft hole 42. During the jacking process of the pipe jacking machine, the cutter disc cone sleeve 4 and the main shaft 3 can be ensured to fit more and more closely, the concentricity between the cutter disc cone sleeve 4 and the main shaft 3 can be ensured, and the torque connection stability between the two can be ensured.

[0049] In this specific implementation mode, Figure 2 and Figure 4 As shown, the central axis hole of the slewing bearing 5 is used to adapt and connect the assembly pillow block 33, and the inner ring end surface wall of the slewing bearing 5 is fixedly connected to the docking pillow block 34 to ensure stable installation between the slewing bearing 5 and the main shaft 3.

[0050] In this specific implementation mode, Figure 2 and Figure 6 As shown, the front seal seat 7 includes a front seal body 70, and a front seal sleeve portion 71 of an integrated structure is provided at the center position of the front seal body 70. The central shaft hole of the front seal sleeve portion 71 is rotatably connected to the front seal shaft platform 35, and a front seal avoidance groove 72 is opened on the front seal body 70. The front seal avoidance groove 72 is used to plug in the end of the docking shaft platform 34 to ensure that the seal between the front seal seat 7 and the main shaft 3 is securely installed.

[0051] In this specific implementation mode, Figure 2 and Fig. 9 As shown, the torque input end 30 is cylindrical, and the cylindrical torque input end 30 is connected to the output shaft end of the reducer 2 through a spline adapter, so that the reducer 2 and the main shaft 3 are easily installed.

[0052] In this specific implementation mode, Figures 8 to 10 As shown, the hydraulic motor 1 is integrally mounted on the reducer 2 via a docking flange 9, which is easy to install.

[0053] The utility model also provides a control device for a single-spindle pipe jacking machine power device, comprising a main control system and a power subsystem, a lubrication subsystem and a high-pressure water supply subsystem electrically connected to the main control system respectively.

[0054] The power subsystem includes a hydraulic motor 1, a reducer 2, a main shaft 3 and a cutter cone sleeve 4 which are sequentially connected in transmission; the lubrication subsystem is used to provide oil to the main shaft 3 so that the power subsystem can achieve stable oil circuit lubrication; the high-pressure water supply subsystem is used to provide high-pressure water to the diversion water outlet channel 43 opened on the cutter cone sleeve 4 so that the power subsystem can achieve stable excavation soil pressure balance.

[0055] Fig.11 This is a flow chart of the control device of the single-spindle pipe jacking machine power device provided by the embodiment of the utility model. The specific starting method steps of the control device provided are as follows:

[0056] S1. Turn on the lubrication subsystem, and supply lubricating grease to the power subsystem according to the preset oil supply pressure value of the lubrication subsystem. In this step, the lubrication subsystem is controlled by the main control system to supply oil. During the oil supply process, the lubrication subsystem inputs lubricating grease into the lubricating grease channel 62 opened on the rear sealing body 60. The lubricating grease is diverted through the tail end of the lubricating grease channel 62 to the contact surface between the rear sealing sleeve 61 and the rear sealing shaft platform 32, thereby lubricating the rotational connection position between the main shaft 3 and the slewing support 5. The preset oil supply pressure value of the lubrication subsystem is the oil working pressure value required for the stable rotation of the main shaft 3.

[0057] S2. Turn on the high-pressure water supply subsystem, and the water supply pressure value and flow value both meet the cutter head excavation requirements; in this step, the high-pressure water supply subsystem is controlled by the main control system to supply high-pressure water. During the supply of high-pressure water, the high-pressure water supply subsystem inputs high-pressure water into the high-pressure water inlet channel 63 opened on the rear sealing body 60. When the main shaft 3 rotates, the high-pressure water intermittently enters the main shaft water inlet hole 320 of the main shaft 3, and is transported to the mating shaft hole 80 of the dull plate through the hollow shaft hole of the main shaft 3, and is diverted to the dull plate diversion channel 81, until it reaches the diversion water outlet channel 43 opened on the cutter head cone sleeve 4 and is discharged, so that high-pressure water can be supplied to the cutter head installed on the cutter head cone sleeve 4, solving the cutter head water supply problem.

[0058] S3. Adjust the real-time oil supply pressure value of the lubrication subsystem according to the power subsystem until it reaches the preset oil supply pressure value of the lubrication subsystem; during the main shaft rotation excavation work of the power subsystem, the lubrication subsystem supplies lubricating grease to the power subsystem in the initial state, which can ensure the stable rotation of the main shaft 3. At this time, the preset oil supply pressure value is directly proportional to the preset speed of the main shaft 3. However, as the main shaft rotates, the oil supply is continuously lost, which will cause the wear of the rotation connection position between the main shaft 3 and the slewing support 5 to increase, and the lack of oil lubrication will cause the rotation speed of the main shaft 3 to slow down. The drive of the main shaft 3 adopts a hydraulic motor 1 and a reducer 2 to provide power rotation torque. The rotation torque speed of the main shaft 3 position can be measured by a speed encoder. Real-time measurement is performed to obtain the real-time rotational speed, which can be fed back to the servo controller. The servo controller has a high-speed pulse output function, so that the servo controller can transmit the high-speed pulse signal to the main control system through the isolation circuit board. The main control system can count the number of pulses of the high-speed pulse signal per unit time, and then simulate the difference between the real-time rotational speed of the spindle 3 and the preset rotational speed. According to the positive proportional relationship between the real-time oil supply pressure value and the real-time rotational speed of the spindle 3, it is convenient to adjust the real-time oil supply pressure value of the lubrication subsystem through the main control system until the preset oil supply pressure value of the lubrication subsystem is reached, thereby ensuring the stable rotation of the spindle, so as to ensure the high-pressure water pressure value and flow value provided by the high-pressure water supply subsystem when the spindle rotates, thereby ensuring the quality of excavation construction.

[0059] This control device is used to control the power subsystem, lubrication subsystem and high-pressure water supply subsystem in linkage through the main control system, so that the power subsystem can achieve stable oil circuit lubrication; so that the power subsystem can achieve stable excavation soil pressure balance and meet the needs of the automated process control device for on-site construction.

[0060] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A single-spindle pipe jacking machine power device, characterized in that: It comprises a hydraulic motor (1), a reducer (2), a main shaft (3) and a cutter cone sleeve (4), wherein the power output end of the hydraulic motor (1) is fixedly connected to the input shaft end of the reducer (2), the output shaft end of the reducer (2) is fixedly connected to one end of the main shaft (3), and one end of the main shaft (3) away from the reducer (2) is connected to the cutter cone sleeve (4) by interference fit; The main shaft (3) is provided with a slewing bearing (5), and the two ends of the slewing bearing (5) are respectively fixedly connected to a rear sealing seat (6) and a front sealing seat (7), and the rear sealing seat (6) and the front sealing seat (7) are respectively rotatably connected to the main shaft (3); A lubrication subsystem is provided between the rear sealing seat (6), the main shaft (3) and the slewing bearing (5), and a high-pressure water supply subsystem is provided between the rear sealing seat (6), the main shaft (3) and the cutter disc cone sleeve (4).

2. A single-spindle pipe jacking machine power device according to claim 1, characterized in that: The two ends of the main shaft (3) are respectively arranged as a torque input end (30) and a torque output end (31); the main shaft (3) is respectively provided with a rear sealing shaft block (32), an assembly shaft block (33), a docking shaft block (34) and a front sealing shaft block (35) in the radial direction from the torque input end (30) to the torque output end (31); the diameter of the shaft block is gradually reduced in the radial direction from the docking shaft block (34) to the torque input end (30); and the diameter of the shaft block is gradually reduced in the radial direction from the docking shaft block (34) to the torque output end (31).

3. A single-spindle pipe jacking machine power device according to claim 2, characterized in that: The lubrication subsystem comprises a lubricating grease channel (62), the lubricating grease channel (62) is opened axially along a rear sealing body (60) included in the rear sealing seat (6), a rear sealing sleeve portion (61) of an integral structure is provided at the center position of the rear sealing body (60), and the rear sealing sleeve portion (61) is rotatably connected to the rear sealing shaft platform (32); The tail end of the lubricating grease channel (62) is branched to the contact surface between the rear sealing sleeve (61) and the rear sealing shaft platform (32).

4. A single-spindle pipe jacking machine power device according to claim 3, characterized in that: The high-pressure water supply subsystem comprises a high-pressure water inlet channel (63), the high-pressure water inlet channel (63) is opened axially along the rear sealing body (60), the tail end of the high-pressure water inlet channel (63) is connected to the central axis hole of the rear sealing sleeve (61), the outer wall of the rear sealing shaft platform (32) is provided with a main shaft water inlet hole (320) connected to the high-pressure water inlet channel (63), the main shaft water inlet hole (320) is connected to the main shaft docking axis hole (80) of the front main shaft (8) through the hollow axis hole of the main shaft (3), the main shaft docking axis hole (80) is connected to a plurality of main shaft shunt channels (81) opened axially on the front main shaft (8), and the main shaft shunt channel (81) is connected to the shunt outlet channel (43) opened on the cutter disc cone sleeve (4).

5. A single-spindle pipe jacking machine power device according to claim 2, characterized in that: A cone sleeve avoidance groove (40) and a blocking plate embedding groove (41) are respectively provided on both sides of the cutter disc cone sleeve (4); the cone sleeve avoidance groove (40) is used for inserting the end of the front sealing shaft platform (35); the blocking plate embedding groove (41) is used for embedding the front blocking plate (8); and a cone shaft hole (42) is provided between the cone sleeve avoidance groove (40) and the blocking plate embedding groove (41); the cone shaft hole (42) is used for adapting and connecting the cone-shaped torque output end (31).

6. A single-spindle pipe jacking machine power device according to claim 2, characterized in that: The central axis hole of the slewing bearing (5) is used for adapting and connecting with the assembly pillow block (33), and the inner ring end surface wall of the slewing bearing (5) is fixedly connected with the docking pillow block (34).

7. A single-spindle pipe jacking machine power device according to claim 2, characterized in that: The front seal seat (7) comprises a front seal body (70), a front seal sleeve (71) of an integral structure is provided at the center of the front seal body (70), the central axis hole of the front seal sleeve (71) is rotatably connected to the front seal shaft platform (35), and a front seal avoidance groove (72) is provided on the front seal body (70), and the front seal avoidance groove (72) is used to insert the end of the docking shaft platform (34).

8. A single-spindle pipe jacking machine power device according to claim 2, characterized in that: The torque input end (30) is cylindrical, and the cylindrical torque input end (30) is connected to the output shaft end of the reducer (2) through a spline adapter.

9. A single-spindle pipe jacking machine power device according to claim 1, characterized in that: The hydraulic motor (1) is mounted on the reducer (2) via a docking flange (9) as an integral structure.

10. A control device for a power device of a single-spindle pipe jacking machine according to claim 4, characterized in that: It includes a main control system and a power subsystem, a lubrication subsystem and a high-pressure water supply subsystem which are electrically connected to the main control system respectively; The power subsystem comprises a hydraulic motor (1), a reducer (2), a main shaft (3) and a cutter cone sleeve (4) which are sequentially connected in transmission; the lubrication subsystem is used to provide oil to the main shaft (3) so that the power subsystem can achieve stable oil circuit lubrication; the high-pressure water supply subsystem is used to provide high-pressure water to the diversion water outlet channel (43) provided on the cutter cone sleeve (4) so ​​that the power subsystem can achieve stable excavation soil pressure balance.

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