Boring lathe for wear-resistant pipeline

Abstract

The invention relates to the technical field of lathe machining, in particular to a boring lathe for a wear-resistant pipeline, which comprises a lathe body, a chuck frame is fixedly mounted on the top surface of the lathe body, a wear-resistant pipe is fixedly mounted on the side of the chuck frame through a chuck, a spindle box capable of being adjusted in a sliding manner is further mounted on the top surface of the lathe body, and a motor is arranged in the spindle box. The end of a main shaft of the motor is fixedly connected with a pressing disc, the side face of the pressing disc is coaxially and fixedly connected with a rotating shaft, and a boring cutter is installed at the tail end of the rotating shaft. The device further comprises a pressure applying assembly which is used for applying axial stress to the pressure plate. Stress is applied to the pressure plate through the pressure applying assembly, so that the rotating shaft is extruded by additional axial stress due to vibration force transmitted by rigid contact between the boring cutter and the interior of the wear-resistant pipe, the vibration frequency and the vibration amplitude of the rotating shaft are reduced, the stability of the rotating shaft and the boring cutter is ensured, and the situation that the surface roughness of the wear-resistant pipe is increased due to vibration is reduced; therefore, the machining precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of lathe processing, in particular to a boring lathe for wear-resistant pipes. Background Art

[0002] Boring is a subtractive manufacturing process that uses specially designed cutting tools to enlarge holes that have been drilled or cast. It is a common type of traditional machining and is used to manufacture a variety of components and workpieces.

[0003] For example, Chinese patent No. CN117206569B discloses a large-scale wear-resistant pipe boring lathe, which includes a fixing mechanism on a base, which fixes a large pipe, an internal boring mechanism for movement, an external boring mechanism on the base, which bores the outer wall of the pipe, a supporting mechanism on the base, which supports pipes of different diameters, and an internal boring mechanism on the fixing mechanism, which bores the inner wall of the pipe. The device can bore the inner and outer walls of the pipe at the same time, the boring tool angle is adjustable, and the angle of the entire boring arm is also adjustable. It can adapt to pipes of different inner diameters, and can also bore difficult processing surfaces such as steps and curved surfaces on the inner wall of the pipe. The invention has the advantages of boring the inner and outer walls of the pipe at the same time, changing the boring position and adjusting the tool angle.

[0004] However, when boring the wear-resistant pipe in this way, due to the high wear resistance, high hardness, oxidation resistance, corrosion resistance and other characteristics of the wear-resistant pipe, the cutting edge may produce large vibrations when boring the wear-resistant pipe, causing the boring bar to produce strong bending elastic deflection and simple harmonic motion due to its own insufficient deflection when subjected to force, resulting in tool deflection or other phenomena that reduce processing accuracy, affecting the processing accuracy. Summary of the invention

[0005] The object of the present invention is to provide a boring lathe for wear-resistant pipes to solve at least one technical problem existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a boring lathe for wear-resistant pipes, comprising a bed, a chuck frame is fixedly installed on the top surface of the bed, a wear-resistant pipe is fixedly installed on the side of the chuck frame through a chuck, a main spindle box capable of sliding adjustment is also installed on the top surface of the bed, a motor is arranged in the main spindle box, a pressure plate is fixedly connected to the end of the main spindle of the motor, a rotating shaft is coaxially fixedly connected to the side of the pressure plate, and a boring tool is installed at the end of the rotating shaft;

[0007] Also included is a pressure-applying assembly, which is used to apply axial stress to the pressure plate.

[0008] Preferably, the pressure-applying assembly includes a connecting piece fixedly mounted on the end of the motor main shaft, a pressure plate fixedly connected to the side end of the connecting piece, two clutch frames are rotatably mounted on the inner wall of the annular groove opened on the side wall of the connecting piece, springs are respectively provided at the middle parts of the two clutch frames and the inner walls of the annular groove, a pressure rod is connected to the side wall of the clutch frame, one end of the pressure rod is fixedly connected to an inclined block, the pressure plate is fitted with the inclined block and the fitting surfaces are set to inclined surfaces in opposite directions.

[0009] Preferably, a pipe rack for inserting wear-resistant pipes is slidably installed on the top surface of the bed, a shaft rack box for inserting a rotating shaft is fixedly installed on the top surface of the bed, an electromagnetic ring is fixedly installed on the outer wall of the rotating shaft, a sliding ring is slidably installed on the outer wall of the rotating shaft, and a magnetic block that can repel or attract the electromagnetic ring is provided on the side wall of the sliding ring, a plurality of rotating rods distributed in a ring are rotatably installed on the outer wall of the electromagnetic ring, an elastic telescopic rod is rotatably installed between the outer wall of the sliding ring and each rotating rod, a rotating seat is rotatably installed on the end of each rotating rod, and a roller is rotatably installed in the rotating seat.

[0010] Preferably, a liquid storage tank is fixedly installed on the top surface of the bed located on the side of the chuck frame, a liquid spray shower connected to the liquid storage tank in one direction is fixedly installed on the side wall of the chuck frame, and the liquid storage tank is connected to an external liquid supply device.

[0011] Preferably, a rotatable reciprocating screw is slidably installed in the cavity in the bed, and the outer wall of the reciprocating screw is threadedly connected with a sliding nut slidably installed in the cavity, and the cross-section of the sliding nut is equal to the cross-section of the cavity. The chuck frame is also provided with a pressurized chamber that is unidirectionally connected to the liquid storage tank, and the pressurized chamber is connected to the cavity through a buried pipe, and a one-way air outlet valve is provided between the buried pipe and the cavity, and a one-way air inlet is also provided above the cavity.

[0012] Preferably, a through slot is provided in the shaft frame box, in which a driving gear is provided that is slidably connected to the outer wall of the rotating shaft through a flat key, and in which a transmission gear that can mesh with the driving gear is also provided. A cylinder is provided in the bed below the through slot, and the main shaft of the cylinder is a fixed gear that meshes with the reciprocating screw through a connecting pipe.

[0013] Preferably, a shock absorber is arranged in the circular hollow groove opened in the rotating shaft, elastic rings are arranged at both ends of the shock absorber, and the diameter of the elastic ring is smaller than the inner diameter of the circular hollow groove.

[0014] Preferably, the boring tool installed on the rotating shaft and penetrating into the end of the wear-resistant tube is a single-edged boring tool.

[0015] Preferably, the outer wall of the rotating rod is provided with a storage cavity into which the elastic telescopic rod can be completely rotated.

[0016] Preferably, the wear-resistant tube is fixedly mounted on the side wall of the chuck frame by a round support clamp.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention applies stress to the pressure plate through a pressure component, so that the vibration force transmitted by the boring tool and the rigid contact inside the wear-resistant tube to the rotating shaft is subjected to additional axial stress compression, thereby reducing the vibration frequency and amplitude of the rotating shaft, ensuring the stability of the rotating shaft and the boring tool, and reducing the increase in the surface roughness of the wear-resistant tube caused by vibration, thereby improving the processing accuracy. The vibration-damping rotating shaft also helps to extend the service life of the tool.

[0019] 2. The present invention drives the clutch frame to rotate outward through the centrifugal force generated by the high-speed rotation of the rotating shaft, and drives the inclined block and the pressure plate to squeeze each other, so that the pressure plate generates axial internal stress, which offsets the vibration force transmitted by the rotating shaft to the pressure plate, thereby reducing the vibration frequency and vibration amplitude of the rotating shaft and the boring tool, so that the boring machine can further optimize the cutting parameters and improve the stability and efficiency of the cutting process.

[0020] 3. The present invention drives the sliding rings to move away from each other through the electromagnetic ring, driving the rotating rod and the elastic telescopic rod to provide radial support for the rotating shaft, thereby preventing the rotating shaft from generating radial vibration or deformation, which would lead to reduced processing accuracy. Moreover, since the rotating rod and the elastic telescopic rod provide radial elastic support for the rotating shaft, the radial vibration can be absorbed and consumed by the elastic telescopic rod, thereby further improving the stability of the boring tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a side cross-sectional schematic diagram of the present invention;

[0023] Figure 3 It is a cross-sectional view of the three-dimensional structure of the present invention;

[0024] Figure 4 For the present invention Figure 3 The enlarged view of point A in the middle;

[0025] Figure 5 The cross section of the pressure component in the present invention is Figure 1 ;

[0026] Figure 6 The cross section of the pressure component in the present invention is Figure 2 ;

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the reciprocating screw in the present invention;

[0028] Figure 8It is a schematic diagram of the electromagnetic ring and its related three-dimensional structure in the present invention.

[0029] In the figure: 1. bed; 2. spindle box; 3. shaft frame box; 4. pipe rack; 5. chuck rack; 6. liquid storage tank; 7. rotating shaft; 8. wear-resistant pipe; 9. motor; 10. reciprocating screw; 11. pressurizing chamber; 12. spray shower; 13. shock absorber; 14. cylinder; 15. connecting pipe; 16. fixed gear; 17. driving gear; 18. transmission gear; 19. electromagnetic ring; 20. sliding ring; 21. rotating rod; 22. rotating seat; 23. elastic telescopic rod; 24. roller; 25. storage chamber; 26. connecting piece; 27. clutch frame; 28. spring; 29. ​​pressure rod; 30. pressure plate; 31. inclined block; 32. sliding nut. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figures 1 to 8 The present invention provides a technical solution: a boring lathe for wear-resistant pipes, comprising a bed 1, a chuck frame 5 is fixedly installed on the top surface of the bed 1, a wear-resistant pipe 8 is fixedly installed on the side of the chuck frame 5 through the chuck, a main spindle box 2 that can be slidably adjusted is also installed on the top surface of the bed 1, a motor 9 is arranged in the main spindle box 2, a pressure plate 30 is fixedly connected to the spindle end of the motor 9, a rotating shaft 7 is coaxially fixedly connected to the side of the pressure plate 30, and a boring tool is installed at the end position of the rotating shaft 7;

[0032] A pressure applying assembly is also included, and the pressure applying assembly is used to apply axial stress to the pressure plate 30 .

[0033] When the device is in use, the wear-resistant tube 8 is first fixed on the side wall of the chuck frame 5 by a chuck, and the axis of the wear-resistant tube 8 is adjusted so that the axis of the wear-resistant tube 8 is in the same straight line with the axis of the rotating shaft 7, and then the spindle box 2 is driven to drive the rotating shaft 7 to approach the wear-resistant tube 8 and the motor 9 drives the rotating shaft 7 and the boring tool to rotate along the axis of the rotating shaft 7, and then the feed speed of the spindle box 2 is adjusted to bore the inner wall of the wear-resistant tube 8. When the boring tool and the wear-resistant tube 8 are in rigid contact, causing the rotating shaft 7 to be subjected to axial vibration, the pressure component applies axial stress to the pressure plate 30 at this time, thereby reducing the vibration frequency of the pressure plate 30 and the rotating shaft 7, so as to achieve the purpose of shock absorbing the rotating shaft 7 and the boring tool, thereby improving the processing accuracy of the wear-resistant tube 8.

[0034] In this way, stress is applied to the pressure plate 30 through the pressure-applying assembly, so that the vibration force transmitted by the boring tool and the rigid contact inside the wear-resistant tube 8 to the rotating shaft 7 is subjected to additional axial stress compression, thereby reducing the vibration frequency and amplitude of the rotating shaft 7, ensuring the stability of the rotating shaft 7 and the boring tool, and reducing the increase in the surface roughness of the wear-resistant tube 8 caused by vibration, thereby improving the processing accuracy. The vibration-damping rotating shaft 7 also helps to extend the service life of the tool.

[0035] Furthermore, the pressure-applying assembly includes a connecting piece 26 fixedly mounted on the end of the main shaft of the motor 9, a pressure plate 30 being fixedly connected to the side end of the connecting piece 26, two clutch frames 27 being rotatably mounted on the inner wall of the annular groove opened on the side wall of the connecting piece 26, springs 28 being respectively provided in the middle parts of the two clutch frames 27 and the inner walls of the annular grooves, a pressure rod 29 being connected to the side wall of the clutch frame 27, an inclined block 31 being fixedly connected to one end of the pressure rod 29, the pressure plate 30 being fitted with the inclined block 31 and the fitting surfaces being arranged as inclined surfaces in opposite directions.

[0036] According to the above embodiment, a specific embodiment of a pressure-applying component is provided. Figure 5 and Figure 6 When the motor 9 drives the rotating shaft 7 and the connecting member 26 to rotate together, the clutch frame 27 is affected by the centrifugal force to squeeze the spring 28 and approach the inner wall of the annular groove, driving the pressure rod 29 and the inclined block 31 to rotate relative to the pressure plate 30. Since the pressure plate 30 is in contact with the inclined block 31 and the contact surfaces are set as inclined surfaces in opposite directions, the inclined block 31 increases the squeezing effect on the pressure plate 30 when it rotates, thereby increasing the internal stress of the pressure plate 30, and using the internal stress to reduce the vibration frequency and vibration amplitude of the rotating shaft 7 and the pressure plate 30, so as to achieve the purpose of applying axial stress to the pressure plate 30.

[0037] In this way, the centrifugal force generated by the high-speed rotation of the rotating shaft 7 drives the clutch frame 27 to rotate outward, and drives the inclined block 31 and the pressure plate 30 to squeeze each other, so that the pressure plate 30 generates axial internal stress, which offsets the vibration force transmitted by the rotating shaft 7 to the pressure plate 30, thereby reducing the vibration frequency and vibration amplitude of the rotating shaft 7 and the boring tool, so that the boring machine can further optimize the cutting parameters and improve the stability and efficiency of the cutting process.

[0038] Furthermore, a pipe rack 4 for the wear-resistant pipe 8 to be inserted is slidably installed on the top surface of the bed 1, a shaft rack box 3 for the rotating shaft 7 to be inserted is fixedly installed on the top surface of the bed 1, an electromagnetic ring 19 is fixedly installed on the outer wall of the rotating shaft 7, a sliding ring 20 is slidably installed on the outer wall of the rotating shaft 7, and a magnetic block that can repel or attract the electromagnetic ring 19 is provided on the side wall of the sliding ring 20, a plurality of rotating rods 21 distributed in a ring are rotatably installed on the outer wall of the electromagnetic ring 19, an elastic telescopic rod 23 is rotatably installed between the outer wall of the sliding ring 20 and each rotating rod 21, a rotating seat 22 is rotatably installed on the end of each rotating rod 21, and a roller 24 is rotatably installed in the rotating seat 22.

[0039] According to the above embodiment, when the rotating shaft 7 is driven by the spindle box 2 and gradually penetrates into the wear-resistant tube 8, the rotating shaft 7 is easily bent and deformed elastically and in simple harmonic motion due to its own weight or insufficient rigid deflection due to the excessive length of the rotating shaft 7 extending out of the shaft frame box 3, causing the boring tool to vibrate radially, thereby reducing the processing quality of the wear-resistant tube 8. At this time, the electromagnetic ring 19 can be energized to push the sliding ring 20 away from each other, and drive the rotating rod 21 and the elastic telescopic rod 23 to rotate and expand together until the roller 24 contacts the inner wall of the wear-resistant tube 8, so as to support the rotating shaft 7 radially, avoid elastic deformation or simple harmonic motion of the rotating shaft 7, and cause the boring tool to give way or swing, thereby affecting the processing accuracy and surface quality of the wear-resistant tube 8.

[0040] In this way, the sliding rings 20 are driven away from each other by the electromagnetic ring 19, driving the rotating rod 21 and the elastic telescopic rod 23 to provide radial support for the rotating shaft 7, thereby preventing the rotating shaft 7 from generating radial vibration or deformation, which would lead to reduced machining accuracy. Moreover, since the rotating rod 21 and the elastic telescopic rod 23 provide radial elastic support for the rotating shaft 7, the radial vibration can be absorbed and consumed by the elastic telescopic rod 23, thereby further improving the stability of the boring tool.

[0041] It is worth mentioning that since the contact position between the roller 24 and the wear-resistant tube 8 is after the boring position of the boring tool and the wear-resistant tube 8, the contact surface between the roller 24 and the wear-resistant tube 8 is relatively smooth, which can avoid excessive friction causing the rotation rate of the rotating shaft 7 to decrease and thus affect the cutting parameters, and the rotating seat 22 is rotatably installed at the end of the rotating rod 21, so that the roller 24 can rotate 360 ​​degrees, further reducing the contact resistance between the roller 24 and the wear-resistant tube 8, and providing radial support force to the rotating shaft 7 under the premise of ensuring the feed speed.

[0042] Furthermore, a liquid storage tank 6 is fixedly installed on the top surface of the bed 1 located on the side of the chuck frame 5, and a liquid spray shower 12 which is in one-way communication with the liquid storage tank 6 is fixedly installed on the side wall of the chuck frame 5, and the liquid storage tank 6 is connected to an external liquid supply device.

[0043] According to the above embodiment, cutting fluid and appropriate hydraulic pressure are provided to the liquid storage tank 6 through an external liquid supply device, so that when the boring tool cuts the wear-resistant tube 8, the cutting fluid can be sprayed out from the liquid spray shower 12 and enter the wear-resistant tube 8, cooling the cutting part while flushing the chips out of the wear-resistant tube 8, avoiding the chips from participating in secondary cutting and causing burrs or roughness in the wear-resistant tube 8.

[0044] Furthermore, a rotatable reciprocating screw 10 is slidably installed in the cavity in the bed 1, and a sliding nut 32 is threadedly connected to the outer wall of the reciprocating screw 10 and slidably installed in the cavity, and the cross-section of the sliding nut 32 is equal to the cross-section of the cavity. A pressurized chamber 11 which is unidirectionally connected to the liquid storage tank 6 is also provided in the chuck frame 5. The pressurized chamber 11 is connected to the cavity through a buried pipe, and a one-way air outlet valve is provided between the buried pipe and the cavity, and a one-way air inlet is also provided above the cavity.

[0045] According to the above embodiment, a specific embodiment of pressurizing the liquid storage tank 6 is provided. Figure 2 and Figure 3 When the external structure drives the reciprocating screw 10 to rotate, the sliding nut 32 is driven to slide back and forth. Figure 3 As shown, when the sliding nut 32 slides to the right, the air pressure on the right side of the sliding nut 32 increases, squeezing the gas into the pressurized chamber 11, and unidirectionally injecting gas into the liquid storage tank 6. At this time, negative pressure is generated on the left side of the sliding nut 32 and gas is sucked in through the one-way air inlet, so that the air pressure in the liquid storage tank 6 increases suddenly, and the cutting fluid in the liquid storage tank 6 is quickly squeezed out to the spray shower 12 and sprayed into the wear-resistant tube 8, and the wear-resistant tube 8 is flushed by the high-speed flowing cutting fluid, thereby improving the cleaning effect of the wear-resistant tube 8.

[0046] Furthermore, a through groove is provided in the shaft frame box 3, in which a driving gear 17 is provided which is slidably connected to the outer wall of the rotating shaft 7 through a flat key, and a transmission gear 18 which can mesh with the driving gear 17 is also provided in the through groove. A cylinder 14 is provided in the bed 1 below the through groove, and the main shaft of the cylinder 14 is rotatably connected to one end of the reciprocating screw 10 through a connecting pipe 15, and a fixed gear 16 which can mesh with the transmission gear 18 is fixedly installed on the outer wall of the reciprocating screw 10.

[0047] According to the above embodiment, a specific driving method of a reciprocating screw 10 is provided. Figure 2 When the motor 9 stops rotating, the cylinder 14 pushes the connecting pipe 15 and the reciprocating screw 10 to move to the right together, so that the fixed gear 16 is meshed with the driving gear 17 through the transmission gear 18, and the reciprocating screw 10 is driven to rotate by the rotational inertia of the rotating shaft 7, and the remaining kinetic energy of the rotating shaft 7 is recovered and the liquid storage tank 6 is pressurized. The wear-resistant pipe 8 after processing is deeply cleaned, and the staff observes and measures the processing quality and surface roughness.

[0048] Furthermore, a shock absorber 13 is arranged in the circular hollow groove opened in the rotating shaft 7 , and elastic rings are arranged at both ends of the shock absorber 13 , and the diameter of the elastic ring is smaller than the inner diameter of the circular hollow groove.

[0049] According to the above embodiment, when the motor 9 drives the rotating shaft 7 to rotate, the shock absorber 13 in the circular hollow groove will rotate around in the circular hollow groove because the diameter of the elastic rings at both ends is smaller than the inner diameter of the circular hollow groove, and due to the friction force, its rotation angular velocity is always lower than the rotation angular velocity of the rotating shaft 7, which can make the elastic ring generate different vibration frequencies when colliding with the rotating shaft 7, and the vibrations generated when contacting the boring tool and the inner wall of the wear-resistant tube 8 affect and offset each other, thereby reducing the vibration amplitude of the rotating shaft 7 and improving the processing accuracy of the boring tool on the wear-resistant tube 8.

[0050] Furthermore, the boring tool installed on the rotating shaft 7 and penetrating into the end of the wear-resistant tube 8 is a single-edged boring tool.

[0051] According to the above embodiment, since the boring tool at the end of the wear-resistant tube 8 is set as a single-edged boring tool, by replacing the tool heads of different sizes, it can adapt to the processing requirements of wear-resistant tubes 8 with different apertures, and the single-edged boring tool can correct the deflection or position error of the axis of the wear-resistant tube 8, thereby improving the processing accuracy of the wear-resistant tube 8. Due to its simple structure, the single-edged boring tool generates less vibration during high-speed processing, which helps to improve the processing quality.

[0052] Furthermore, the outer wall of the rotating rod 21 is provided with a receiving cavity 25 into which the elastic telescopic rod 23 can be fully rotated.

[0053] According to the above embodiment, when the electromagnetic ring 19 drives the sliding rings 20 to approach each other (see Figure 8 ), at this time, the elastic telescopic rod 23 is rotated into the storage cavity 25, until the rotating rod 21 is completely rotated in and can be parallel to the rotating shaft 7, and the outer wall of the rotating shaft is provided with a groove for controlling the rotating rod 21 to be completely rotated in, so that the diameter of the rotating rod 21 and the elastic telescopic rod 23 after contraction does not exceed the outer diameter of the rotating rod 21, thereby avoiding the rotating rod 21 and the elastic telescopic rod 23 from hindering the feeding of the rotating shaft 7.

[0054] Furthermore, the wear-resistant tube 8 is fixedly mounted on the side wall of the chuck frame 5 by means of a rounding clamp.

[0055] According to the above embodiment, since the supporting circle clamp clamps and fixes the wear-resistant tube 8 in a manner of spreading outward from a fixed center of the circle, the axial position of the wear-resistant tube 8 is relatively fixed and easy to align with the axis of the rotating shaft 7, which simplifies the positioning steps of the wear-resistant tube 8, thereby improving the processing efficiency of the wear-resistant tube 8.

[0056] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A boring lathe for wear-resistant pipes, comprising a bed (1), characterized in that: A chuck frame (5) is fixedly mounted on the top surface of the bed (1), a wear-resistant tube (8) is fixedly mounted on the side of the chuck frame (5) via a chuck, a slidably adjustable spindle box (2) is also mounted on the top surface of the bed (1), a motor (9) is arranged in the spindle box (2), a pressure plate (30) is fixedly connected to the spindle end of the motor (9), a rotating shaft (7) is coaxially fixedly connected to the side of the pressure plate (30), and a boring tool is mounted at the end of the rotating shaft (7); It also comprises a pressure applying assembly, which is used to apply axial stress to the pressure plate (30).

2. The boring lathe for wear-resistant pipes according to claim 1, characterized in that: The pressure-applying assembly comprises a connecting member (26) fixedly mounted on the end of the main shaft of the motor (9), a pressure plate (30) fixedly connected to the side end of the connecting member (26), two clutch frames (27) rotatably mounted on the inner wall of an annular groove provided on the side wall of the connecting member (26), springs (28) are respectively provided at the middle parts of the two clutch frames (27) and the inner wall of the annular groove, a pressure rod (29) is connected to the side wall of the clutch frame (27), one end of the pressure rod (29) is fixedly connected to an inclined block (31), the pressure plate (30) and the inclined block (31) are fitted together, and the fitting surfaces are set as inclined surfaces with opposite directions.

3. The boring lathe for wear-resistant pipes according to claim 2, characterized in that: A pipe rack (4) capable of allowing a wear-resistant pipe (8) to pass through is slidably mounted on the top surface of the bed (1), a shaft rack box (3) capable of allowing a rotating shaft (7) to pass through is fixedly mounted on the top surface of the bed (1), an electromagnetic ring (19) is fixedly mounted on the outer wall of the rotating shaft (7), a sliding ring (20) is slidably mounted on the outer wall of the rotating shaft (7), and a magnetic attraction block capable of repelling or attracting the electromagnetic ring (19) is provided on the side wall of the sliding ring (20), a plurality of rotating rods (21) distributed in an annular shape are rotatably mounted on the outer wall of the electromagnetic ring (19), an elastic telescopic rod (23) is rotatably mounted between the outer wall of the sliding ring (20) and each rotating rod (21), a rotating seat (22) is rotatably mounted at the end of each rotating rod (21), and a roller (24) is rotatably mounted in the rotating seat (22).

4. The boring lathe for wear-resistant pipes according to claim 3, characterized in that: A liquid storage tank (6) is fixedly mounted on the top surface of the bed (1) located on the side of the chuck frame (5), a liquid spray shower (12) which is in one-way communication with the liquid storage tank (6) is fixedly mounted on the side wall of the chuck frame (5), and the liquid storage tank (6) is in communication with an external liquid supply device.

5. The boring lathe for wear-resistant pipes according to claim 4, characterized in that: A rotatable reciprocating screw (10) is slidably installed in the cavity in the bed (1); a sliding nut (32) slidably installed in the cavity is threadedly connected to the outer wall of the reciprocating screw (10); and the cross section of the sliding nut (32) is equal to the cross section of the cavity; a pressurizing chamber (11) which is unidirectionally connected to the liquid storage tank (6) is also provided in the chuck frame (5); the pressurizing chamber (11) is connected to the cavity through an embedded pipe, and a one-way air outlet valve is provided between the embedded pipe and the cavity; and a one-way air inlet is also provided above the cavity.

6. The boring lathe for wear-resistant pipes according to claim 5, characterized in that: The shaft frame box (3) is provided with a through slot, and a driving gear (17) is provided in the through slot and is slidably connected to the outer wall of the rotating shaft (7) through a flat key. A transmission gear (18) that can mesh with the driving gear (17) is also provided in the through slot. A cylinder (14) is provided in the bed (1) below the through slot, and the main shaft of the cylinder (14) is rotatably connected to one end of the reciprocating screw (10) through a connecting pipe (15). A fixed gear (16) that can mesh with the transmission gear (18) is fixedly installed on the outer wall of the reciprocating screw (10).

7. The boring lathe for wear-resistant pipes according to claim 3, characterized in that: A shock absorber (13) is arranged in the circular hollow groove opened in the rotating shaft (7), and elastic rings are arranged at both ends of the shock absorber (13), and the diameter of the elastic ring is smaller than the inner diameter of the circular hollow groove.

8. The boring lathe for wear-resistant pipes according to claim 7, characterized in that: The boring tool installed on the rotating shaft (7) and penetrating into the end of the wear-resistant tube (8) is a single-edged boring tool.

9. The boring lathe for wear-resistant pipes according to claim 8, characterized in that: The outer wall of the rotating rod (21) is provided with a receiving cavity (25) into which the elastic telescopic rod (23) can be completely rotated.

10. The boring lathe for wear-resistant pipes according to claim 1, characterized in that: The wear-resistant pipe (8) is fixedly mounted on the side wall of the chuck frame (5) by means of a rounding clamp.

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