A pipe sawing device for arm pre-assembly

Abstract

A pipe sawing device for pre-fitting an arm comprises a supporting mechanism for supporting the arm and a sawing mechanism for sawing the arm; the supporting mechanism comprises a plurality of sawing pliers distributed along a straight line, the sawing pliers comprises a fixing plate and a tightening block for tightening the arm against the fixing plate; the sawing mechanism comprises a sawing machine, a first driving unit for driving the sawing machine to move radially along the arm, and a second driving unit for driving the sawing machine to move axially along the arm. The present invention provides a pipe sawing device for pre-fitting an arm, which can improve the processing efficiency of the arm, and can process both flat and oblique arm.

Description

Technical Field

[0001] The invention relates to the technical field of wrist arm processing, in particular to a pipe sawing device for wrist arm pre-assembly. Background Art

[0002] In the traction power supply system, the arm is an important part of the contact network. The arm is usually installed on the upper part of the pillar to support the contact suspension and transfer the load. The arm is generally made of round steel pipe, and its length is related to the structural height of the contact suspension, the side limit of the pillar, and the position of the pillar. With the development of technology, the arm structure has been constantly changing, and simplified arms have gradually begun to be used. The simplified arm is mainly composed of flat arm, oblique arm, combined load-bearing cable seat, aluminum alloy support, support connector, combined positioning ring, pipe cap and positioner. Among them, the flat arm and the oblique arm are both processed with pipe fittings as raw materials. During the processing, the pipe fittings need to be sawed to obtain the required size. In the existing arm processing technology, pipe fittings are mostly cut manually, which is inefficient and cannot meet the needs of large-scale production. Summary of the invention

[0003] In order to solve the deficiencies in the prior art, the present invention provides a pipe sawing device for pre-assembly of a wrist arm, which can improve the processing efficiency of the wrist arm and can process both flat wrist arm pipes and oblique wrist arm pipes.

[0004] In order to achieve the above-mentioned purpose, the specific scheme adopted by the present invention is: a wrist-arm pre-equipped pipe sawing device, including a supporting mechanism for supporting the pipe and a sawing mechanism for sawing the pipe; the supporting mechanism includes a plurality of sawing pliers distributed along a straight line, and the sawing pliers include a fixed plate and a tightening block for tightening the pipe against the fixed plate; the sawing mechanism includes a sawing machine, a first driving unit for driving the sawing machine to move radially along the pipe, and a second driving unit for driving the sawing machine to move axially along the pipe.

[0005] As a further optimization of the above-mentioned arm sawing device: the supporting mechanism includes two main supporting rods that are parallel to each other and fixedly connected, the main supporting rods are arranged horizontally, the sawing pliers are movably connected to the two main supporting rods, the two main supporting rods are also movably connected to columns, a U-shaped groove is fixedly arranged on the column, a plurality of rollers are rotatably arranged in the U-shaped groove, the pipe passes through the U-shaped groove and is placed on the rollers.

[0006] As a further optimization of the above-mentioned arm sawing device: a plurality of through grooves are opened on the fixed plate, support rollers are rotatably arranged in the through grooves, and the axes of the support rollers are perpendicular to the axes of the pipes, and a limiting groove is opened on the tightening block, and the limiting groove extends along the axial direction of the pipe.

[0007] As a further optimization of the above-mentioned wrist arm sawing device: the pipe is a flat wrist arm pipe or an oblique wrist arm pipe, and the support mechanism includes a flat wrist arm pipe positioning unit for positioning the end of the flat wrist arm pipe and an oblique wrist arm pipe positioning unit for positioning the end of the oblique wrist arm pipe.

[0008] As a further optimization of the above-mentioned wrist arm sawing device: the flat wrist arm tube positioning unit includes a fixed support block, a receiving groove for receiving the flat wrist arm tube is opened on the support block, a clamping motor is fixedly arranged on the side of the support block, the clamping motor is driven and connected to at least one swing arm, and all the swing arms are commonly fixedly connected to a pressure plate for pressing the tube in the receiving groove.

[0009] As a further optimization of the above-mentioned wrist arm sawing device: the flat wrist arm tube positioning unit includes a flat wrist arm tube push plate movably arranged at one end of the flat wrist arm tube, and the flat wrist arm tube push plate and the flat wrist arm tube are perpendicular to each other, a long groove is opened on the flat wrist arm tube push plate, and a laser ranging sensor is arranged on the side of the flat wrist arm tube push plate facing away from the flat wrist arm tube, and the detection light of the laser ranging sensor passes through the long groove.

[0010] As a further optimization of the above-mentioned arm sawing device: a positioning hole is opened at one end of the oblique arm tube, and the oblique arm tube positioning unit includes a movably arranged oblique arm tube positioning pin, and the oblique arm tube positioning pin matches the positioning hole.

[0011] As a further optimization of the above-mentioned arm sawing device: the oblique arm tube positioning unit includes a fixed support block and a clamping cylinder, the support block is provided with a receiving groove for accommodating the oblique arm tube, the clamping cylinder is driven and connected to at least one rotating plate, and all rotating plates are commonly fixedly connected to a clamping rod for clamping the oblique arm tube.

[0012] As a further optimization of the above-mentioned wrist-arm sawing device: the device includes a drilling mechanism for drilling holes in the pipe, and the drilling mechanism includes at least one servo drilling machine arranged on the side of the pipe.

[0013] As a further optimization of the above-mentioned arm sawing device: the device also includes a waste chute obliquely arranged below the pipe.

[0014] Beneficial effects: The present invention can automatically saw the wrist arm, thereby improving the processing efficiency of the wrist arm, and can process both flat wrist arm pipes and oblique wrist arm pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2It is a structural schematic diagram of a flat wrist-arm pipe positioning unit;

[0017] Figure 3 It is a schematic diagram of the structure of sawing pliers;

[0018] Figure 4 It is a structural schematic diagram of the sawing mechanism;

[0019] Figure 5 It is a structural schematic diagram of the oblique arm tube positioning unit.

[0020] Description of the drawings: 1-main support rod, 2-end support plate, 3-clamping motor, 4-swing arm, 5-pressing plate, 6-first servo drilling machine, 7-accommodating groove, 8-support block, 9-reciprocating photoelectric sensor, 10-rack, 11-waste slide, 12-pipe, 13-moving support plate, 14-first servo drive, 15-sawing pliers, 16-sawing machine, 17-sawing support plate, 18-second servo drive, 19-second servo drilling machine, 20-flat wrist arm pipe push plate, 21-clamping cylinder, 22- clamping rod, 23-vertical plate, 24-horizontal plate, 25-fixed plate, 26-through groove, 27-support roller, 28-clamping block, 29-limiting groove, 30-clamping cylinder, 31-adjusting cylinder, 32-slide rail, 33-slider, 34-column, 35-U-shaped groove, 36-roller, 37-long groove, 38-laser ranging sensor, 39-side plate, 40-connecting shaft, 41-rotating plate, 42-oblique wrist arm pipe positioning pin, 43-lifting cylinder, 44-pushing cylinder, 45-mounting plate. DETAILED DESCRIPTION

[0021] 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.

[0022] See also Figures 1 to 5 A pipe sawing device for arm pre-assembly includes a supporting mechanism for supporting a pipe 12 and a sawing mechanism for sawing the pipe 12.

[0023] The supporting mechanism includes a plurality of sawing pliers 15 distributed along a straight line. The sawing pliers 15 include a fixing plate 25 and a tightening block 28 for tightening the pipe 12 against the fixing plate 25 .

[0024] The sawing mechanism includes a sawing machine 16 , a first driving unit for driving the sawing machine 16 to move in the radial direction of the pipe 12 , and a second driving unit for driving the sawing machine 16 to move in the axial direction of the pipe 12 .

[0025] When in use, the pipe 12 is supported by a supporting mechanism. Specifically, the pipe 12 is pressed against the fixing plate 25 by a clamping block 28 to clamp the pipe 12. Then, the sawing machine 16 is driven by a first driving unit to extend along the length direction of the pipe 12. After reaching the target position, the sawing machine 16 is driven by a second driving unit to extend along the radial direction of the pipe 12, so that the sawing machine 16 can cut the pipe 12 and complete the sawing process of the pipe 12.

[0026] The present invention can automatically saw the pipe 12, thereby improving the processing efficiency of the arm.

[0027] In order to better support the pipe 12 and ensure that the pipe 12 remains stable during the sawing process, thereby improving the sawing accuracy, the supporting mechanism includes two main support rods 1 that are parallel to each other and fixedly connected. The main support rods 1 are arranged horizontally, and the sawing clamps 15 are movably connected to the two main support rods 1. The two main support rods 1 are also movably connected to columns 34, and a U-shaped groove 35 is fixedly arranged on the column 34. A plurality of rollers 36 are rotatably arranged in the U-shaped groove 35. The pipe 12 passes through the U-shaped groove 35 and is placed on the rollers 36. During the sawing process, the length of the pipe 12 will change. The sawing pliers 15 can move along the main support rod 1 according to the current length of the pipe 12, so as to support the pipe 12 at a suitable position to avoid the end of the pipe 12 being suspended in the air, thereby ensuring the stability of the pipe 12. The column 34 cooperates with the U-shaped groove 35 to further enhance the stability of the pipe 12. Considering that the sawing machine 16 will cause the pipe 12 to vibrate when sawing the pipe 12, which is more likely to cause the pipe 12 to deviate, the column 34 can be set on the side of the sawing machine 16 and move along the axial direction of the pipe 12 synchronously with the sawing machine 16. The roller 36 is used to enable the pipe 12 to still move along the axial direction after entering the U-shaped groove 35, so as to facilitate the adjustment of the position of the pipe 12 to determine the initial position of the pipe 12, thereby further improving the processing accuracy.

[0028] The specific movement setting method of the sawing pliers 15 is as follows: the sawing pliers 15 is set on a movable support plate 13, and the movable support plate 13 is slidably connected to the main support rod 1, and a first servo driver 14 is vertically set on the movable support plate 13, and the first servo driver 14 is driven and connected with a gear, and the gear is located below the movable support plate 13, and a rack 10 extending along the length direction is also fixedly set on the main support rod 1, and the rack 10 cooperates with the gear, and the first servo driver 14 drives the gear to rotate, and the gear cooperates with the rack 10 so that the gear can move along the rack 10, thereby driving the movable support plate 13 and the sawing pliers 15 to move. In order to ensure that the direction of the movable support plate 13 will not deviate, two tracks can be fixedly set on the main support rod 1, and the movable support plate 13 is slidably connected to the two tracks, so that the two tracks are used to guide the movable support plate 13.

[0029] The second drive unit can adopt a similar structure, that is, the sawing machine 16 is set on a sawing support plate 17, the sawing support plate 17 is movably set on the two main support rods 1, and the sawing support plate 17 is slidably connected to the two tracks. The second drive unit includes a second servo driver 18 vertically set on the sawing support plate 17, and the second servo driver 18 is also driven and connected to a gear located below the sawing support plate 17 and matching the rack 10. The second servo driver 18 drives the gear to rotate, and the sawing support plate 17 is driven to move on the main support rod 1 by the cooperation of the gear and the rack 10, thereby driving the sawing machine 16 to move along the axial direction of the pipe 12. In this embodiment, the first servo driver 14 and the second servo driver 18 can be set as motors.

[0030] On the basis of the sawing support plate 17, the first driving unit includes two slide rails 32 fixedly arranged on the sawing support plate 17, and the slide rails 32 are perpendicular to the main support rod 1, and a slider 33 is slidably arranged on the slide rails 32, and the two sliders 33 are fixedly connected with a movable block, and the movable block is fixedly connected with the sawing machine 16, and the movable block is fixedly connected with an adjusting cylinder 31, and the piston rod of the adjusting cylinder 31 is parallel to the slide rails 32. When it is necessary to move the sawing machine 16 along the radial direction of the pipe 12 to saw the pipe 12, the adjusting cylinder 31 is started, and the movable block and the slider 33 are pushed to move along the slide rails 32. During the movement of the movable block, the sawing machine 16 is driven to move, so as to adjust the position of the sawing machine 16, and then the sawing machine 16 is used to saw the pipe 12.

[0031] In order to improve the sawing accuracy, it is necessary to fine-tune the position of the pipe 12 before the pipe 12 is fixed by the sawing pliers 15. In order to ensure that the pipe 12 can move in the sawing pliers 15, a plurality of through slots 26 are provided on the fixing plate 25. A support roller 27 is rotatably arranged in the through slot 26, and the axis of the support roller 27 is perpendicular to the axis of the pipe 12. A limiting slot 29 is provided on the tightening block 28, and the limiting slot 29 extends along the axial direction of the pipe 12. While supporting the pipe 12, the support roller 27 can also use its own rotatable characteristics to avoid excessive resistance to the pipe 12 during the movement of the pipe 12, thereby ensuring that the position of the pipe 12 can be fine-tuned by moving the pipe 12.

[0032] The specific structure of the sawing pliers 15 further includes a vertical plate 23 fixedly set on the movable support plate 13, and the two vertical plates 23 are parallel to each other, a horizontal plate 24 is fixedly connected between the tops of the two vertical plates 23, a fixed plate 25 is vertically fixed on the horizontal plate 24, a tightening block 28 is slidably set on the horizontal plate 24, and a clamping cylinder 30 is also fixedly set on the horizontal plate 24, and the clamping cylinder 30 is drivingly connected to the tightening block 28. When the tightening block 28 tightens the pipe 12 onto the fixing plate 25, the tightening block 28 and the fixing plate 25 can prevent the pipe 12 from shaking horizontally. In order to further prevent the pipe 12 from shaking vertically, a limiting groove 29 is provided on the side of the tightening block 28 facing the fixing plate 25. The limiting groove 29 extends along the length direction of the pipe 12 and passes through two oppositely arranged side walls of the tightening block 28. When the tightening block 28 tightens the pipe 12 onto the fixing plate 25, the pipe 12 is located in the limiting groove 29 and will not shake in the vertical direction.

[0033] Typically, the tube 12 is a flat wrist arm tube or an oblique wrist arm tube. In order to further improve the processing efficiency of the device so that the device can process both flat wrist arm tubes and oblique wrist arm tubes, the support mechanism includes a flat wrist arm tube positioning unit for positioning the end of the flat wrist arm tube and an oblique wrist arm tube positioning unit for positioning the end of the oblique wrist arm tube.

[0034] The specific structure of the flat wrist arm pipe positioning unit is as follows: the flat wrist arm pipe positioning unit includes a fixed support block 8, a receiving groove 7 for receiving the flat wrist arm pipe is provided on the support block 8, a clamping motor 3 is fixedly provided on the side of the support block 8, the clamping motor 3 is driven and connected with at least one swing arm 4, and all the swing arms 4 are fixedly connected with a pressing plate 5 for pressing the pipe 12 in the receiving groove 7. The support block 8 cooperates with the support mechanism to support the flat wrist arm pipe and further ensure the stability of the flat wrist arm pipe during the sawing process. After the flat wrist arm pipe is placed in the receiving groove 7, the clamping motor 3 is started, and the clamping motor 3 drives the swing arm 4 to swing, and then the swing arm 4 drives the pressing plate 5 to press the flat wrist arm pipe on the support block 8, thereby fixing the position of the flat wrist arm pipe. The support block 8 is fixedly set on an end support plate 2, and the end support plate 2 is fixedly set on one end of the main support rod 1.

[0035] Considering that it is difficult to accurately control the position of the flat wrist arm tube in the process of placing the flat wrist arm tube on the support mechanism and the support block 8, it is necessary to further adjust the flat wrist arm tube. Accordingly, the flat wrist arm tube positioning unit includes a flat wrist arm tube push plate 20 that is movably arranged at one end of the flat wrist arm tube, and the flat wrist arm tube push plate 20 is perpendicular to the flat wrist arm tube. A long slot 37 is provided on the flat wrist arm tube push plate 20. A laser distance sensor 38 is provided on the side of the flat wrist arm tube push plate 20 that is away from the flat wrist arm tube. The detection light of the laser distance sensor 38 passes through the long slot 37. After the flat wrist arm tube is placed on the support mechanism and the support block 8, the flat wrist arm tube is pushed to move axially by the flat wrist arm tube push plate 20, and the laser distance sensor 38 is used to measure the flat wrist arm tube. The position of the flat wrist arm tube is accurately determined by the distance between the flat wrist arm tube and the laser distance sensor 38.

[0036] The specific structure of the oblique wrist arm pipe positioning unit is as follows: a positioning hole is provided at one end of the oblique wrist arm pipe, and the oblique wrist arm pipe positioning unit includes a movable oblique wrist arm pipe positioning pin 42, and the oblique wrist arm pipe positioning pin 42 matches the positioning hole. The oblique wrist arm pipe is positioned by utilizing its own structure, which is convenient, fast, and accurate. The oblique wrist arm pipe positioning pin 42 is also fixedly connected to a lifting cylinder 43, and the lifting cylinder 43 is used to push the oblique wrist arm pipe positioning pin 42 up and down. When the oblique wrist arm pipe is placed on a supporting mechanism for support, the lifting cylinder 43 pushes the oblique wrist arm pipe positioning pin 42 upward through the positioning hole.

[0037] In order to further ensure the stability of the oblique arm tube, the oblique arm tube positioning unit includes a fixed support block 8 and a clamping cylinder 21. The support block 8 is provided with a receiving groove 7 for receiving the oblique arm tube. The clamping cylinder 21 is driven and connected to at least one rotating plate 41. All rotating plates 41 are commonly fixedly connected to a clamping rod 22 for clamping the oblique arm tube. After the oblique arm tube positioning pin 42 passes through the positioning hole to position the oblique arm tube, the clamping cylinder 21 drives the rotating plate 41 to rotate. The rotating plate 41 drives the clamping rod 22 to rotate synchronously during the rotation process until the clamping rod 22 clamps the oblique arm tube. More specifically, the oblique arm pipe is usually fixedly connected to a single-ear connecting plate, and a positioning hole is provided on the single-ear connecting plate. After the oblique arm pipe positioning pin 42 passes through the positioning hole, the single-ear connecting plate is pressed by the clamping rod 22. The single-ear connecting plate can be fixed by the clamping rod 22 to ensure that the single-ear connecting plate is in a horizontal state, thereby controlling the posture of the oblique arm pipe. In addition, the oblique arm pipe positioning unit also includes a support block 8 and a clamping motor 3. The support block 8 is used to cooperate with the support mechanism to support the oblique arm pipe, and the clamping motor 3 also drives the clamping plate 5 connected to the support block 8 for clamping the oblique arm pipe.

[0038] The structure of the oblique wrist arm pipe positioning unit also includes a horizontally fixed mounting plate 45, a lifting cylinder 43 is arranged below the mounting plate 45, a clamping cylinder 21 is fixedly connected to the mounting plate 45, and two parallel side plates 39 are fixedly arranged on the mounting plate 45, each of the two side plates 39 is rotatably connected to a rotating plate 41, and a connecting shaft 40 is fixedly connected between the two rotating plates 41, a sleeve is sleeved on the connecting shaft 40, and the inner diameter of the sleeve is larger than the diameter of the connecting shaft 40, and the piston rod of the clamping cylinder 21 is fixedly connected to the sleeve. When the clamping cylinder 21 is actuated, the piston rod pushes the sleeve to move, and then the sleeve drives the connecting shaft 40 to move. The connecting shaft 40 drives the two rotating plates 41 to rotate during the movement, and the rotating plate 41 drives the clamping rod 22 to rotate during the rotation until the clamping rod 22 presses the oblique wrist arm pipe to the position on the support block 8.

[0039] In order to improve the versatility of the present invention, ensure that both flat wrist arm tubes and oblique wrist arm tubes can be processed, and reduce the complexity of the device, the flat wrist arm tube push plate 20 and the laser ranging sensor 38 in the flat wrist arm tube positioning unit are also arranged on the mounting plate 45, and accordingly, a pushing cylinder 44 is also fixedly arranged on the mounting plate 45, and the pushing cylinder 44 is used to push the flat wrist arm tube push plate 20.

[0040] In order to ensure that the flat wrist arm tube positioning unit and the oblique wrist arm tube positioning unit can function normally, a through-beam photoelectric sensor 9 is fixedly arranged on the support block 8, and the detection light of the through-beam photoelectric sensor 9 is perpendicular to the receiving groove 7. The through-beam photoelectric sensor 9 can be used to detect whether the flat wrist arm tube and the oblique wrist arm tube have successfully entered the receiving groove 7, and other structures can be started after they have successfully entered the receiving groove 7.

[0041] In addition to sawing, in order to facilitate the subsequent processing and assembly process, the device includes a drilling mechanism for drilling holes on the pipe 12, and the drilling mechanism includes at least one servo drilling machine arranged on the side of the pipe 12. In this embodiment, two servo drilling machines are provided, namely a fixed first servo drilling machine 6 and a movable second servo drilling machine 19.

[0042] After the sawing is completed, the sawn portion of the pipe 12 becomes waste. In order to better collect the waste, the device further includes a waste chute 11 obliquely arranged below the pipe 12. After falling, the waste falls into the waste chute 11 and slides down along the waste chute 11. A special receiving device can be arranged below the waste chute 11 to receive the waste.

[0043] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pipe sawing device for pre-assembly of wrist and arm, characterized in that: It comprises a supporting mechanism for supporting the pipe (12) and a sawing mechanism for sawing the pipe (12); The support mechanism comprises a plurality of sawing pliers (15) distributed along a straight line, the sawing pliers (15) comprising a fixing plate (25) and a tightening block (28) for tightening the pipe (12) against the fixing plate (25); The pipe (12) is a flat arm pipe or an oblique arm pipe, the support mechanism comprises an oblique arm pipe positioning unit for positioning the end of the oblique arm pipe, one end of the oblique arm pipe is provided with a positioning hole, the oblique arm pipe positioning unit comprises a movably arranged oblique arm pipe positioning pin (42), and the oblique arm pipe positioning pin (42) matches the positioning hole; The support mechanism comprises a flat wrist arm tube positioning unit for positioning the end of the flat wrist arm tube; the flat wrist arm tube positioning unit comprises a fixed support block (8), the support block (8) is provided with a receiving groove (7) for receiving the flat wrist arm tube, a clamping motor (3) is fixedly arranged on the side of the support block (8), the clamping motor (3) is driven and connected to at least one swing arm (4), and all the swing arms (4) are commonly fixedly connected to a pressing plate (5) for pressing the tube (12) in the receiving groove (7); the flat wrist arm tube positioning unit comprises a flat wrist arm tube push plate (20) movably arranged at one end of the flat wrist arm tube, and the flat wrist arm tube push plate (20) is perpendicular to the flat wrist arm tube, a long groove (37) is provided on the flat wrist arm tube push plate (20), and a laser distance sensor (38) is arranged on the side of the flat wrist arm tube push plate (20) facing away from the flat wrist arm tube, and the detection light of the laser distance sensor (38) passes through the long groove (37); The oblique arm tube positioning unit comprises a fixed support block (8) and a pressing cylinder (21); the support block (8) is provided with a receiving groove (7) for receiving the oblique arm tube; the pressing cylinder (21) is drivingly connected to at least one rotating plate (41); all rotating plates (41) are commonly fixedly connected to a pressing rod (22) for pressing the oblique arm tube; The support mechanism comprises two main support rods (1) which are parallel to each other and fixedly connected, the main support rods (1) are arranged horizontally, the sawing pliers (15) are movably connected to the two main support rods (1), and the two main support rods (1) are also movably connected to a column (34), a U-shaped groove (35) is fixedly arranged on the column (34), a plurality of rollers (36) are rotatably arranged in the U-shaped groove (35), and the pipe (12) passes through the U-shaped groove (35) and is placed on the rollers (36); the fixed plate (25) is provided with a plurality of through grooves (26), a support roller (27) is rotatably arranged in the through groove (26), and the axis of the support roller (27) is perpendicular to the axis of the pipe (12), and the clamping block (28) is provided with a limiting groove (29), and the limiting groove (29) extends along the axial direction of the pipe (12); The sawing mechanism comprises a sawing machine (16), a first driving unit for driving the sawing machine (16) to move in the radial direction of the pipe (12), and a second driving unit for driving the sawing machine (16) to move in the axial direction of the pipe (12).

2. A pipe sawing device for arm pre-assembly as claimed in claim 1, characterized in that: The device comprises a drilling mechanism for drilling a hole on a pipe (12), wherein the drilling mechanism comprises at least one servo drilling machine arranged on the side of the pipe (12).

3. A pipe sawing device for arm pre-assembly as claimed in claim 1, characterized in that: The device further comprises a waste chute (11) arranged obliquely below the pipe (12).

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