Internal cutting type pipe fitting sawing machine

Abstract

The invention provides an internal cutting type pipe fitting sawing machine in the technical field of sawing machines, which comprises a base, a pipe fitting clamping and moving mechanism used for clamping a pipe fitting to be cut during use and movably arranged on the left side of the upper part of the base in the left-right direction, and a main frame movably arranged on the right side of the upper part of the base in the front-back direction, the mounting frame is movably arranged in the main frame in the vertical direction, the main shaft penetrates through the mounting frame in the left-right direction and is rotatably arranged on the mounting frame, and the saw blade is fixedly arranged at the left end of the main shaft and is used for cutting a pipe fitting to be cut from the interior of the pipe fitting to be cut during use. The main shaft driving motor is fixedly arranged on the mounting frame, is positioned in the main frame and is used for driving the main shaft to rotate so as to drive the saw blade to rotate. By means of the design of the overall structure, the saw blade is innovatively arranged in the pipe fitting to be cut to conduct winding type cutting from inside to outside, the problem of large-size steel pipe cutting in the prior art can be solved, the structure is small, exquisite and compact, and the saw blade can be directly and conveniently arranged on a steel pipe machining production line to cut the ends of the steel pipes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sawing machines, in particular to an internal cutting type pipe sawing machine. BACKGROUND

[0002] In the production process of seamless steel pipes, the production process determines that the size deviation of the two ends of the produced blank steel pipe is large, and the two ends of the blank steel pipe need to be cut off by a cutting machine. The common methods for cutting off the two ends of the blank steel pipe on the market mainly include flame cutting, band saw cutting or circular saw machine cutting. Among them, the end face quality of the flame cutting is poor, and the cutting surface is hardened after cutting, which is not convenient for subsequent processing; the production efficiency of the band saw cutting is low, which cannot meet the requirements of high output of enterprises; the cutting surface quality of the circular saw machine cutting is good, and the efficiency is high, but since the existing circular saw machines all adopt the mode of cutting the steel pipe from the outside by using saw blades, when the diameter of the steel pipe is slightly large, the corresponding circular saw machine is prohibitively expensive, and due to the limitation of the diameter of the saw blade, large-diameter steel pipes cannot be cut from the outside to the inside. To solve this problem, the patent document with the authorization announcement number CN222971119U discloses a high-speed rotary cutting machine, which rotates and cuts large-diameter heavy steel pipes through auxiliary facilities, which can solve the problem of cutting large-size heavy steel pipes, but due to the influence of many factors such as bending and weight of large-size heavy steel pipes, the overall requirement of the cutting machine is high, the volume is large, and it is difficult to match with the seamless steel pipe processing production line online. SUMMARY

[0003] The purpose of the present application is to solve the problems existing in the prior art and provide an internal cutting type pipe sawing machine.

[0004] The technical scheme of the present application is that the internal cutting type pipe sawing machine of the present application has the following structural characteristics: a base as a mounting base, a pipe clamping and moving mechanism for clamping the pipe to be cut and movably arranged on the left side of the upper part of the base, a main frame movably arranged on the right side of the upper part of the base, a mounting frame movably arranged in the main frame, a main shaft movably arranged in the mounting frame and rotatably arranged on the mounting frame, a saw blade fixedly arranged on the left end of the main shaft and used for cutting from the inside of the pipe to be cut, and a main shaft driving motor and a gear box fixedly arranged on the mounting frame and located in the main frame and used for driving the main shaft to rotate to drive the saw blade to rotate.

[0005] A further solution is as follows: the aforementioned pipe clamping and moving mechanism includes a clamping seat, a lifting power source located above the clamping seat, a lifting machine located above the clamping seat and connected to the lifting power source, a clamp movably located inside the clamping seat and connected to the lifting machine for clamping or releasing the pipe to be cut during operation, a first slide rail fixedly installed on each of the front and rear sides of the upper left side of the base in the left and right directions, two first sliders slidably installed on each of the first slide rails and whose upper ends are fixedly connected to the bottom of the clamping seat, and a set of clamping seat driving assemblies with the same structure installed on each of the front and rear sides of the left side of the base for driving the clamping seat to move left and right.

[0006] A further embodiment is as follows: the aforementioned clamping seat drive assembly includes a clamping seat drive motor fixedly mounted on the base, a clamping seat drive screw pair driven by the clamping seat drive motor, and a first transmission connector fixedly connected to the clamping seat and transmittedly connected to the clamping seat drive screw pair.

[0007] A further embodiment is as follows: the aforementioned clamping seat drive assembly includes a second transmission connector fixedly mounted on the clamping seat, a piston rod connector fixedly mounted on the base, and a hydraulic cylinder having a piston rod; the hydraulic cylinder is fixedly connected to the second transmission connector, and the outer end of the piston rod of the hydraulic cylinder is fixedly connected to the piston rod connector.

[0008] A further embodiment is as follows: the aforementioned clamping seat drive assembly includes a motor gear set and a rack. The motor gear set includes a motor or hydraulic motor as a driving power source and gears driven by the motor or hydraulic motor. The motor gear set is fixedly mounted on the clamping seat, and the rack is fixedly mounted on the base. The gears of the motor gear set mesh with the rack.

[0009] A further option is that the power source of the aforementioned elevator is an elevator drive motor; or the power source of the aforementioned elevator is an elevator drive cylinder; or the power source of the aforementioned elevator is an elevator drive hydraulic cylinder.

[0010] A further solution is as follows: the main frame is a hollow, rectangular structure with an opening on the left side; the main frame is movable forward and backward on the base through a main frame drive assembly; the main frame drive assembly includes two second slide rails fixedly mounted forward and backward on the upper right side of the base, two second sliders movably mounted on each second slide rail and fixedly connected at their upper ends to the bottom of the main frame, a main frame drive motor fixedly mounted on the rear right side of the base, and a main frame drive screw pair driven by the main frame drive motor and connected to the lower end of the main frame.

[0011] A further embodiment is as follows: The aforementioned mounting bracket drive assembly includes a lifting slide rail fixedly installed vertically on each of the front and rear sides of the left end of the main frame; two lifting sliders slidably installed on each lifting slide rail and fixedly connected to the mounting bracket; a mounting bracket drive motor fixedly installed on the upper surface of the main frame; a mounting bracket drive screw pair driven by the mounting bracket drive motor and connected to the mounting bracket; and a mounting bracket counterweight cylinder installed on the main frame to share the weight of the mounting bracket and the components installed on the mounting bracket, which is supported by the mounting bracket drive motor and the mounting bracket drive screw pair.

[0012] A further embodiment is as follows: The aforementioned mounting frame includes a frame body and a sleeve located at the center of the frame body in a left-right direction. The aforementioned spindle is rotatably engaged with the sleeve of the mounting frame from its middle part, and the right part of the spindle extends from the right end of the frame body of the mounting frame into the hollow part of the main frame. The spindle is provided with a coolant channel along its axial center line, and a rotary device is provided at the right end of the spindle, which is driven by the spindle and communicates with the coolant channel of the spindle. This rotary device is used to inject coolant and spray coolant from both sides of the saw blade through the coolant channel of the spindle to cool the saw blade and the pipe to be cut.

[0013] Further options include: the aforementioned internal pipe sawing machine also includes a brake fixedly mounted on the right side of the gearbox, the brake having a rotating mechanism fixedly connected to the main shaft; the base has a chip discharge trough at the middle, inclined from the right center to the left end, for discharging waste chips generated during cutting.

[0014] This invention has positive effects: Through the design of the overall structure, this invention innovatively places the saw blade inside the pipe to be cut and performs a circular cutting from the inside out. Therefore, it can effectively solve the problem of cutting large-size steel pipes (pipes to be cut) in the prior art. In addition, the internal cutting pipe sawing machine of this invention has a small and compact overall structure, which can be directly and conveniently installed on the steel pipe processing production line, connecting to the incoming materials of the steel pipe production line, and cutting the ends of the steel pipes. It has low cost, high efficiency, and significant economic benefits. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall planar structure of the first embodiment of the present invention; Figure 2 for Figure 1 The diagram shown is a three-dimensional structural schematic of the present invention; Figure 3 To and Figure 2 Schematic diagrams of the three-dimensional structure when viewed from different angles; Figure 4 for Figure 1 Top view; Figure 5 for Figure 1 The left view; Figure 6 forFigure 5 The EE section view shows the pipe to be cut clamped in its initial position. Figure 7 for Figure 6 The state of the pipe to be cut when it is clamped and moved to the set position; Figure 8 for Figure 7 The state of the pipe fitting to be cut when it is cut at the set position; Figure 9 This is a three-dimensional structural diagram of the second embodiment of the present invention; Figure 10 for Figure 9 A schematic diagram of the three-dimensional structure after partially opening and omitting the drawing method in the middle; Figure 11 This is a three-dimensional structural diagram of the third embodiment of the present invention; Figure 12 This is a three-dimensional structural diagram of the fourth embodiment of the present invention.

[0016] The reference numerals in the above figures are as follows: Base 1, chip discharge trough 11; pipe fitting clamping and moving mechanism 2, clamping seat 21, cutting clearance slot 21-1, lifting platform 22, lifting platform power source 23, lifting platform drive motor 23-1, lifting platform drive cylinder 23-2, clamp 24, first slide rail 25, first slider 26, clamping seat drive assembly 27, clamping seat drive motor 27-1, clamping seat drive screw pair 27-2, first transmission connector 27-3, motor gear set 27-4, rack 27-5, hydraulic cylinder 27-6, second transmission connector 27-7, piston rod connector 27-8; main Frame 3, main frame drive assembly 31, second slide rail 31-1, second slider 31-2, main frame drive motor 31-3, main frame drive screw pair 31-4; mounting frame 4, frame body 41, sleeve 42, mounting frame drive assembly 43, lifting slide rail 43-1, lifting slider 43-2, mounting frame drive motor 43-3, mounting frame drive screw pair 43-4, mounting frame counterweight cylinder 43-5; spindle 5, coolant channel 51, rotary head 52; saw blade 6; spindle drive motor 7; gearbox 8; brake 9; pipe to be cut 100, cut workpiece 101. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] (Example 1) In this embodiment, when describing the orientation, it uses... Figure 1 The direction being faced is the front as described, with the back to the front. Figure 1 The direction it faces is as described, towards the rear. Figure 1The up-down and left-right directions are still the same as those described.

[0019] See Figures 1 to 6 The internal cutting pipe sawing machine of this embodiment mainly consists of a base 1, a pipe clamping and moving mechanism 2, a main frame 3, a mounting frame 4, a main shaft 5, a saw blade 6, a main shaft drive motor 7, a gearbox 8, and a brake 9.

[0020] The base 1 serves as the installation foundation for the internal cutting pipe saw in this embodiment. The base 1 has a chip discharge trough 11 that slopes from the right center to the left end to facilitate the discharge of cutting waste generated during use.

[0021] The pipe clamping and moving mechanism 2 is used to clamp the pipe 100 to be cut and is movably mounted on the base 1 in the left and right directions. In one specific implementation, the pipe clamping and moving mechanism 2 of this embodiment includes a clamping seat 21, a lifting mechanism 22, a lifting mechanism power source 23, a clamp 24, a first slide rail 25, a first slider 26, and a clamping seat drive assembly 27. The clamping seat 21 is a hollow structural component, and a ring of cutting clearance slots 21-1 is provided inside the clamping seat 21. The lifting mechanism 22 and the lifting mechanism power source 23 are both located above the clamping seat 21. The clamp 24 is movably mounted above the clamping seat 21 and is connected to the lifting mechanism for transmission. The clamp 24 is used to clamp or release the pipe 100 to be cut during use. In this embodiment, the lifting mechanism power source 23 is a lifting mechanism drive motor 23-1. One first slide rail 25 is fixedly installed on each of the front and rear sides of the chip discharge trough 11 on the upper end of the base 1. Two first sliders 26 are slidably installed on each of the two first slide rails 25. The clamping seat 21 is fixedly connected to one of the first sliders 26 at each of its four lower corners. The clamping seat drive assembly 27 has two sets with the same structure. In this embodiment, each clamping seat drive assembly 27 includes a clamping seat drive motor 27-1 fixedly installed on the base 1, a clamping seat drive screw pair 27-2 driven by the clamping seat drive motor 27-1, and a first transmission connector 27-3 fixedly connected to the clamping seat 21 and transmittedly connected to the clamping seat drive screw pair 27-2.

[0022] The main frame 3 is a hollow, rectangular structure that is movably mounted on the base 1 in the front-to-back direction and has an opening on the left side. The main frame 3 is movable in the front-to-back direction on the base 1 through the main frame drive assembly 31. As a specific implementation, in this embodiment, the main frame drive assembly 31 includes two second slide rails 31-1 fixedly mounted on the upper right side surface of the base 1 in the front-to-back direction, two second sliders 31-2 movably mounted on each of the two second slide rails 31-1 and fixedly connected at their upper ends to the bottom of the main frame 3, a main frame drive motor 31-3 fixedly mounted on the rear right side of the base 1, and a main frame drive screw pair 31-4 driven by the main frame drive motor 31-3 and connected to the lower end of the main frame 3 for transmission. Thus, during operation, the main frame 3 can move in the front-to-back direction under the support and drive of the main frame drive assembly 31.

[0023] The mounting frame 4 includes a frame body 41 and a sleeve 42 located at the center of the frame body 41 in a left-right direction. The mounting frame 4 is movably mounted on the main frame 3 in a vertical direction via a mounting frame drive assembly 43. In one specific implementation, the mounting frame drive assembly 43 includes a lifting slide rail 43-1 fixedly mounted vertically on each of the front and rear sides of the left end of the main frame 3. Two lifting sliders 43-2 are slidably mounted on each lifting slide rail 43-1. The mounting frame 4 is fixedly connected to the two lifting sliders 43-2 on each side of the left end of its frame body 41. The main body of the frame body 41 is located inside the main frame 3. The mounting frame drive motor 43-3 is fixedly mounted on the upper surface of the main frame 3. The mounting frame drive motor 43-3 is connected to the frame body 41 of the mounting frame 4 via a mounting frame drive screw pair 43-4 and drives the mounting frame 4 to move vertically along the two lifting slide rails 43-1 and the four lifting sliders 43-2. The mounting frame counterweight cylinder 43-5 is used to share the weight of the mounting frame 4 and related components on the mounting frame 4, which are supported by the mounting frame drive motor 43-3 and the mounting frame drive screw pair 43-4; and to reduce the power output of the mounting frame drive motor 43-3 during operation, so as to save energy. In this embodiment, two mounting frame counterweight cylinders 43-5 are fixedly installed on the main frame 3, and the two mounting frame counterweight cylinders 43-5 are respectively connected to the frame body 41 of the mounting frame 4 by the end of their respective piston rods; obviously, only one mounting frame counterweight cylinder 43-5 may be provided.

[0024] The spindle 5 is rotatably fitted with the sleeve 42 of the mounting bracket 4, and the right side of the spindle 5 extends from the right end of the frame 41 of the mounting bracket 4 into the hollow part of the main frame 3. The saw blade 6 is fixed to the left end of the spindle 5, and rotates with the spindle 5 during operation. Preferably, the spindle 5 has a coolant channel 51 along its axial centerline, and a rotary head 52 for inputting coolant is located on the right end of the spindle 5, rotating with the spindle 5 and communicating with the coolant channel 51. During cutting, the coolant input through the rotary head 52 is sprayed from both sides of the saw blade 6 through the coolant channel 51 of the spindle 5 onto the saw teeth of the saw blade 6, cooling the saw blade and the pipe 100 to be cut, thereby effectively extending the life of the saw blade 6. The rotary head 52 is a commercially available component.

[0025] The spindle drive motor 7 and the gearbox 8 are both fixedly mounted on the frame 41 of the mounting bracket 4 in the hollow part of the main frame 3. The spindle drive motor 7 is connected to the spindle 5 through the gearbox 8 and drives the spindle 5 to rotate, thereby driving the saw blade 6 to rotate.

[0026] Brake 9 is preferably configured to be mounted on gearbox 8 and located on the right side of gearbox 8. The rotating mechanism of brake 9 is fixedly connected to spindle 5. The purpose of brake 9 is to effectively eliminate the impact of the gap in the transmission chain from spindle drive motor 7 to spindle 5 on sawing when saw blade 6 is making intermittent cuts, thereby effectively improving the life of saw blade 6 and sawing quality. Brake 9 is a commercially available part.

[0027] The working principle and process of the internal cutting pipe saw in this embodiment are briefly described as follows: Please see Figures 6 to 8After the pipe fitting 100 to be cut is conveyed from left to right to the clamping seat 21 and placed in the set position, the lifting power source 23 drives the lifting machine 22 to move the clamp 24 downward to clamp the pipe fitting 100 to be cut. The two sets of clamping seat drive components 27 move together to move the clamping seat 21 and the clamped pipe fitting 100 to the right to the set position. At this time, the saw blade 6 is inside the pipe fitting 100 to be cut and is located at the cutting clearance slot 21-1 of the clamping seat 21. The main shaft drive motor 7 drives the main shaft 5 through the gearbox 8 to rotate the saw blade 6. The main frame drive component 31 drives the main frame 3 to move back and forth, and cooperates with the mounting frame drive component 43 to drive the frame 41 of the mounting frame 4 to move up and down. Correspondingly, the main shaft 5 makes corresponding back and forth and up and down movements. The saw blade 6 first cuts through the pipe 100 to be cut, and then the saw blade 6 moves in a circle around the center of the pipe 100 to cut the pipe 100. After the cutting is completed, the two sets of clamping seat drive assemblies 27 move the clamping seat 21 together with the clamped and cut pipe 100 to move to the left to the initial position. Then the elevator power source 23 drives the elevator 22 to move the clamp 24 upward to release the pipe 100 to be cut. The cut workpiece 101 cut off from the pipe 100 is unloaded. The waste chips generated by cutting fall into the chip discharge trough 11 of the base 1 for chip discharge. Then the above actions are repeated for the next cutting process.

[0028] (Example 2) Please see Figure 9 and Figure 10 The internal pipe sawing machine of this embodiment is the same as that of embodiment 1 in other aspects, except for two aspects: First, the lifting power source 23 of the pipe clamping and moving mechanism 2 is replaced by the lifting drive cylinder 23-2 of this embodiment instead of the lifting drive motor 23-1 in embodiment 1. Obviously, the lifting drive oil cylinder can also be used instead of the lifting drive motor 23-1 in embodiment 1. Second, the mounting frame counterweight cylinder 43-5 is changed from the external setting method in embodiment 1 to the built-in method set inside the main frame 3 in this embodiment.

[0029] (Example 3) Please see Figure 11The internal pipe sawing machine of this embodiment is the same as that of Embodiment 2 in other aspects, except that the clamping seat drive assembly 27 in this embodiment does not adopt the structure of clamping seat drive motor 27-1, clamping seat drive screw pair 27-2 and first transmission connector 27-3 as in Embodiments 2 and 1. In this embodiment, the clamping seat drive assembly 27 is composed of hydraulic cylinder 27-6, second transmission connector 27-7 and piston rod connector 27-8. The second transmission connector 27-7 is fixedly mounted on the clamping seat 21, the hydraulic cylinder 27-6 is fixedly connected to the second transmission connector 27-7, and the piston rod connector 27-8 is fixedly mounted on the base 1. The piston rod of the hydraulic cylinder 27-6 is fixedly connected to the piston rod connector 27-8. During operation, the clamping seat 21 moves left and right by the extension and retraction of the piston rod of the hydraulic cylinder 27-6.

[0030] (Example 4) Please see Figure 12 The internal pipe sawing machine of this embodiment is the same as that of Embodiment 1 in other aspects, except for two aspects: First, the mounting bracket counterweight cylinder 43-5 is changed from the external setting in Embodiment 1 to the internal setting inside the main frame 3 in this embodiment; Second, the clamping seat drive assembly 27 in this embodiment does not adopt the structure composed of clamping seat drive motor 27-1, clamping seat drive screw pair 27-2 and first transmission connecting member 27-3 as in Embodiments 2 and 1; In this embodiment, the clamping seat drive assembly Component 27 includes a motor gear set 27-4 and a rack 27-5. The rack 27-5 is fixedly mounted on the base 1. The motor gear set 27-4 includes a motor or hydraulic motor and a gear driven by the motor or hydraulic motor. The motor gear set 27-4 is fixedly mounted on the clamping seat 21. The gear of the motor gear set 27-4 meshes with the rack 27-5. During operation, the forward and reverse rotation of the motor or hydraulic motor of the motor gear set 27-4 is achieved through the engagement of the gear of the motor gear set 27-4 with the rack 27-5, which drives the clamping seat 21 to move left and right.

[0031] As can be seen from the foregoing, the internal cutting pipe saw of the present invention, through the design of its overall structure, innovatively places the saw blade 6 inside the pipe to be cut 100 and performs a circular cutting from the inside out. Therefore, it can effectively solve the problem of cutting large-size steel pipes (pipes) in the prior art. Furthermore, the internal cutting pipe saw of the present invention has a compact overall structure, which can be directly and conveniently installed on the steel pipe processing production line, connecting to the incoming material of the steel pipe production line, and cutting the end of the steel pipe. It has low cost, high efficiency, and significant economic benefits.

[0032] The above embodiments are descriptions of specific implementations of the present invention, and not limitations thereof. Those skilled in the art can make various modifications and changes without departing from the spirit and scope of the present invention to obtain corresponding equivalent technical solutions. Therefore, all equivalent technical solutions should be included in the patent protection scope of the present invention.

Claims

1. An internal cutting pipe saw, characterized in that: It includes a base serving as the installation foundation, a pipe clamping and moving mechanism that clamps the pipe to be cut during use and is movably mounted on the upper left side of the base, a main frame that is movably mounted on the upper right side of the base, a mounting frame that is movably mounted in the vertical direction within the main frame, a main shaft that extends horizontally through the mounting frame and is rotatably mounted on the mounting frame, a saw blade that is fixedly mounted on the left end of the main shaft and cuts from the inside of the pipe to be cut during use, and a main shaft drive motor and gearbox that are fixedly mounted on the mounting frame and located within the main frame for driving the main shaft to rotate, thereby driving the saw blade to rotate.

2. The internal cutting pipe sawing machine according to claim 1, characterized in that: The pipe clamping and moving mechanism includes a clamping seat, a lifting power source located above the clamping seat, a lifting machine located above the clamping seat and connected to the lifting power source, a clamp movably located inside the clamping seat and connected to the lifting machine for clamping or releasing the pipe to be cut during operation, a first slide rail fixedly arranged on each of the front and rear sides of the upper left part of the base in the left and right directions, two first sliders slidably arranged on each of the first slide rails and whose upper ends are fixedly connected to the bottom of the clamping seat, and a set of clamping seat driving assemblies with the same structure for driving the clamping seat to move left and right on each of the front and rear sides of the left part of the base.

3. The internal cutting pipe sawing machine according to claim 2, characterized in that: The clamping seat drive assembly includes a clamping seat drive motor fixedly mounted on the base, a clamping seat drive screw pair driven by the clamping seat drive motor, and a first transmission connector fixedly connected to the clamping seat and pulsatorically connected to the clamping seat drive screw pair.

4. The internal cutting pipe sawing machine according to claim 2, characterized in that: The clamping seat drive assembly includes a second transmission connector fixedly mounted on the clamping seat, a piston rod connector fixedly mounted on the base, and a hydraulic cylinder having a piston rod; the hydraulic cylinder is fixedly connected to the second transmission connector, and the outer end of the piston rod of the hydraulic cylinder is fixedly connected to the piston rod connector.

5. The internal cutting pipe sawing machine according to claim 2, characterized in that: The clamping seat drive assembly includes a motor gear set and a rack. The motor gear set includes an electric motor or hydraulic motor as a driving power source and gears driven by the electric motor or hydraulic motor. The motor gear set is fixedly mounted on the clamping seat, and the rack is fixedly mounted on the base. The gears of the motor gear set mesh with the rack.

6. The internal cutting pipe sawing machine according to claim 2, characterized in that: The power source of the elevator is an elevator drive motor; or the power source of the elevator is an elevator drive cylinder; or the power source of the elevator is an elevator drive hydraulic cylinder.

7. The internal cutting pipe sawing machine according to claim 1, characterized in that: The main frame is a hollow, rectangular structure with an opening on the left side. The main frame is movable forward and backward on the base through a main frame drive assembly. The main frame drive assembly includes two second slide rails fixedly mounted forward and backward on the upper right side of the base. Two second sliders are movably mounted on each second slide rail, and their upper ends are fixedly connected to the bottom of the main frame. A main frame drive motor is fixedly mounted on the rear right side of the base. A main frame drive screw pair is driven by the main frame drive motor and is connected to the lower end of the main frame.

8. The internal cutting pipe sawing machine according to claim 7, characterized in that: The mounting bracket drive assembly includes a lifting slide rail fixedly installed vertically on each of the front and rear sides of the left end of the main frame; two lifting sliders slidably installed on each lifting slide rail and fixedly connected to the mounting bracket; a mounting bracket drive motor fixedly installed on the upper surface of the main frame; a mounting bracket drive screw pair driven by the mounting bracket drive motor and connected to the mounting bracket; and a mounting bracket counterweight cylinder installed on the main frame to share the weight of the mounting bracket and the components installed on the mounting bracket, which is supported by the mounting bracket drive motor and the mounting bracket drive screw pair.

9. The internal cutting pipe sawing machine according to claim 1, characterized in that: The mounting frame includes a frame body and a sleeve located at the center of the frame body in a left-right direction. The main shaft is rotatably engaged with the sleeve of the mounting frame from its middle part, and the right part of the main shaft extends from the right end of the frame body into the hollow part of the main frame. The main shaft has a coolant channel along its axial center line, and a rotary head is provided at the right end of the main shaft, which is driven by the main shaft and communicates with the coolant channel of the main shaft. This rotary head is used to inject coolant and spray coolant from both sides of the saw blade through the coolant channel of the main shaft to cool the saw blade and the pipe to be cut.

10. The internal cutting pipe sawing machine according to claim 1, characterized in that: It also includes a brake fixedly mounted on the right side of the gearbox, the brake having a rotating mechanism fixedly connected to the main shaft; the base has a chip discharge trough that slopes from the right center to the left end for discharging waste chips generated during cutting.

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