A pipe one-side threading device

Abstract

The utility model relates to pipeline processing technical field and propose a kind of pipeline one-side threading equipment, it include: base, set on ground;Threading assembly, set on the base, for processing the outer surface of pipe fitting and form outer thread;Clamping assembly, movably set on the base, for clamping fixed pipe fitting;Drive assembly, set on the base, for driving the clamping assembly and the pipe fitting being clamped close or away from threading assembly;Positioning assembly, set on clamping assembly, positioning assembly has positioning part, and positioning part rotatably set on clamping assembly, wherein, when pipe fitting is placed on clamping assembly, positioning part is resisted in the end surface of pipe fitting close to threading assembly, pre-positioning pipe fitting, when drive assembly drives pipe fitting to close threading assembly, positioning part separates from pipe fitting.The utility model can be clamped in the same position of different pipe fittings by positioning part and clamping assembly, to improve the machining precision of threading assembly to pipe fitting.

Description

Technical Field

[0001] This utility model relates to the field of pipe processing technology, and in particular to a pipe single-sided threading device. Background Technology

[0002] Pipe threading equipment is used to process external threads on the outside of pipes, and the threaded pipes can be connected to other pipes by thread.

[0003] Existing pipe threading equipment can clamp the pipe and transport it to the vicinity of the threading cutter on a lathe, where the rotating cutter processes external threads on the pipe. While existing pipe threading equipment can clamp the pipe, it cannot pre-position the clamped position. If the pipe is clamped at different positions, the length of the external thread after threading will also be different, resulting in errors in pipe processing.

[0004] Therefore, a single-sided pipe threading device that can locate the clamped position of the pipe is proposed to solve the technical problem that existing equipment cannot pre-locate the clamped position of the pipe, thereby improving the threading accuracy of the pipe. Utility Model Content

[0005] In view of this, the present invention proposes a pipe threading device that can locate the clamped position of the pipe, thereby solving the technical problem that the existing equipment cannot pre-locate the clamped position of the pipe and improving the threading accuracy of the pipe.

[0006] This utility model proposes a single-sided threading device for pipes, comprising: The base is set on the ground; A threading assembly, mounted on the machine base, is used to process the outer surface of pipe fittings to form external threads; A clamping assembly, movably mounted on the base, is used to clamp and fix the pipe fitting; A drive assembly, mounted on the machine base, is used to drive the clamping assembly and the clamped pipe fitting closer to or away from the threading assembly. A positioning component is disposed on the clamping component. The positioning component has a positioning part that is rotatably disposed on the clamping component. When the pipe is placed on the clamping component, the positioning part abuts against the end face of the pipe near the threading component to preposition the pipe. When the driving component moves the pipe closer to the threading component, the positioning part separates from the pipe.

[0007] Based on the above technical solution, preferably, the positioning component includes: A rotating shaft is rotatably mounted on the clamping assembly, passes through the clamping assembly along the axial direction of the pipe, and extends from both ends away from the clamping assembly. A positioning plate is fixedly installed at one end of the rotating shaft extending from the clamping assembly, and is spaced apart from the clamping assembly along the axial direction of the pipe fitting. It is used to pre-position the pipe fitting in the position of the clamping assembly, and the positioning plate serves as a positioning part. A lifting and rotating plate is fixedly installed at the other end of the shaft extension clamping assembly; The sliding lifting mechanism has one end slidably connected to the lifting rotating plate and the other end slidably connected to the base. It is used to gradually rotate the positioning plate from being held against the end face of the pipe to moving away from the pipe as the driving component gradually approaches the threading component.

[0008] Based on the above technical solution, preferably, the sliding lifting mechanism includes: A fixed block is fixedly mounted on the drive component and is used to move synchronously with the drive component; The inclined slide rail is fixedly mounted on the machine base to form an upwardly inclined guide area; The floating rod has its non-end slidably connected to the fixed block in the vertical direction. One end of the floating rod is slidably connected to the lifting rotating plate, and the other end of the floating rod is slidably connected to the inclined slide rail. When the clamping assembly approaches the threading assembly, the floating rod drives the positioning plate to rotate away from the pipe fitting.

[0009] Based on the above technical solution, preferably, the positioning plate and the lifting rotating plate are distributed on different sides of the rotating shaft, so that when the lifting rotating plate rotates upward counterclockwise, the positioning plate rotates counterclockwise around the rotating shaft to move away from the pipe fitting.

[0010] Based on the above technical solution, preferably, the clamping assembly includes: The clamp is mounted on the drive assembly. At least two first linear drive units are symmetrically arranged on the clamping seat for moving closer to or further away from each other. At least two grippers are provided at the output ends of at least two first linear drive units, respectively, to grip the pipe at different positions when the at least two grippers are gripping the pipe.

[0011] Based on the above technical solution, preferably, each gripper is provided with a number of gripping tongues with gaps distributed in between, and the positions of the gripping tongues and gaps in two opposing grippers are staggered, so as to make the two opposing grippers bite each other.

[0012] Based on the above technical solution, preferably, each gripper is provided with a gripping groove at the gripping tongue, and the abutting surface between the gripping groove and the pipe is a non-flat convex surface.

[0013] Based on the above technical solution, preferably, the clamping assembly further includes: A displacement sensor is installed on the mating grippers to detect the displacement of the pipe fitting after the two grippers have clamped it.

[0014] Based on the above technical solution, preferably, the clamping assembly further includes: The pipe fitting detector is mounted on the clamping seat and is used to detect whether there are pipe fittings on the clamping seat.

[0015] Based on the above technical solution, preferably, the driving component includes: The second linear drive unit is mounted on the base; The conveyor seat, located at the output end of the second linear drive unit, is used to convey the clamped pipe fitting closer to or away from the threading assembly.

[0016] The single-sided threading device for pipes provided by this utility model has the following advantages compared with the prior art: (1) When the pipe needs to be threaded, place the pipe in the clamping assembly and hold one end of the pipe against the positioning part so that the position of the pipe relative to the clamping assembly is pre-positioned. The positioning part can clamp the clamping assembly at the same position of different pipes, thereby improving the processing accuracy of the threading assembly on the pipe. (2) As the pipe fitting approaches the threading assembly, the positioning plate will gradually rotate counterclockwise and move downward to allow the threading assembly to process the pipe fitting normally. The positioning plate can both preposition the position of the pipe fitting on the clamping seat and not affect the threading assembly's processing of the pipe fitting. (3) The two jaws contact the pipe fitting through the clamping groove. Even when clamping pipe fittings with different outer diameters, it can still ensure that the axis of the pipe fitting is collinear with the axis of the threading assembly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of a single-sided threading device for pipes according to the present invention; Figure 2 This is a perspective view of a single-sided threading device for pipes according to this utility model. Figure 3 for Figure 2 A magnified view of a portion of the image; Figure 4 This is a perspective view of the clamping assembly of this utility model; Figure 5This is a top view of the clamping assembly of this utility model.

[0019] Reference numerals: 1. Base; 2. Threading assembly; 3. Clamping assembly; 31. Clamping seat; 32. First linear drive unit; 33. Gripper; 331. Clamping tongue; 3301. Clamping groove; 34. Displacement sensor; 35. Pipe fitting detector; 4. Positioning assembly; 41. Rotating shaft; 42. Positioning plate; 43. Lifting rotating plate; 44. Sliding lifting mechanism; 441. Fixed block; 442. Inclined slide rail; 443. Floating rod; 5. Drive assembly; 51. Second linear drive unit; 511. Motor; 512. Lead screw; 52. Conveyor seat; 53. Guide rail. Detailed Implementation

[0020] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0021] Existing pipe threading equipment can clamp the pipe and transport it to the vicinity of the threading cutter on a lathe, where the rotating cutter processes external threads on the pipe. While existing pipe threading equipment can clamp the pipe, it cannot pre-position the clamped area. If the pipe is clamped at different positions, the length of the threaded external thread will vary, resulting in errors in pipe processing. Therefore, if... Figure 1 and Figure 2 As shown, this utility model proposes a single-sided pipe threading device that can locate the clamped position of the pipe, comprising: Base 1 is installed on the ground; The threading assembly 2 is mounted on the machine base 1 and is used to process the outer surface of the pipe fitting to form external threads; The clamping assembly 3 is movably mounted on the base 1 and is used to clamp and fix the pipe fittings; The drive assembly 5 is mounted on the base 1 and is used to drive the clamping assembly 3 and the clamped pipe fitting to move closer to or away from the threading assembly 2. Positioning component 4 is disposed on clamping component 3. Positioning component 4 has a positioning part, which is rotatably disposed on clamping component 3. When the pipe is placed on clamping component 3, the positioning part abuts against the end face of the pipe near threading component 2 to preposition the pipe. When driving component 5 drives the pipe to approach threading component 2, the positioning part separates from the pipe.

[0022] When the pipe fitting needs to be threaded, the pipe fitting is placed in the clamping assembly 3 and one end of the pipe fitting is held against the positioning part, so that the position of the pipe fitting relative to the clamping assembly 3 is pre-positioned. The positioning part can clamp the clamping assembly 3 at the same position for different pipe fittings, thereby improving the processing accuracy of the threading assembly 2 on the pipe fitting.

[0023] like Figure 3 As shown, in order to ensure that the positioning part does not affect the processing of the fitting sleeve assembly 2, the positioning assembly 4 includes: The rotating shaft 41 is rotatably mounted on the clamping assembly 3, passes through the clamping assembly 3 along the axial direction of the pipe, and extends at both ends away from the clamping assembly 3. The positioning plate 42 is fixedly installed at one end of the rotating shaft 41 that extends out of the clamping assembly 3, and is spaced apart from the clamping assembly 3 along the axial direction of the pipe fitting. It is used to pre-position the pipe fitting in the position of the clamping assembly 3. The positioning plate 42 serves as the positioning part. The lifting and rotating plate 43 is fixedly installed at the other end of the rotating shaft 41 that extends out of the clamping assembly 3; The sliding lifting mechanism 44 is slidably hinged to the lifting rotating plate 43 at one end and slidably connected to the base 1 at the other end. It is used to gradually rotate the positioning plate 42 away from the end face of the pipe fitting as the driving component 5 gradually approaches the threading component 2.

[0024] When the clamping assembly 3 is in a position away from the threading assembly 2, that is, when the drive assembly 5 is in a non-operational state, one end of the positioning plate 42 can abut against the end face of the pipe fitting. The positioning plate 42 can be used to predetermine the position of the clamping assembly 3 clamping the pipe fitting. When the clamping assembly 3 clamps the pipe fitting and the drive assembly 5 transports the clamped pipe fitting close to the threading assembly 2, the positioning plate 42 rotates away from the pipe fitting and gradually separates from the pipe fitting.

[0025] Specifically, as the drive component 5 gradually approaches the threading component 2, the sliding lifting mechanism 44 converts the horizontal linear motion of the drive component 5 into a vertical linear motion, and drives the lifting rotating plate 43 to rotate through the vertical linear motion, and drives the positioning plate 42 to rotate relative to the clamping component 3 by the rotating shaft 41.

[0026] To ensure that the drive assembly 5 can smoothly drive the lifting rotating plate 43 to rotate relative to the clamping assembly 3, the sliding lifting mechanism 44 includes: The fixing block 441 is fixedly mounted on the drive component 5 and is used to move synchronously with the drive component 5. The tilting slide rail 442 is fixedly mounted on the base 1 to form an upward tilting guide area; The floating rod 443 has its non-end slidably connected to the fixed block 441 in the vertical direction. One end of the floating rod 443 is slidably hinged to the lifting rotating plate 43, and the other end of the floating rod 443 is slidably connected to the inclined slide rail 442. When the clamping assembly 3 is close to the threading assembly 2, the floating rod 443 drives the positioning plate 42 to rotate away from the pipe fitting.

[0027] In the specific motion process, the fixed block 441 moves together with the drive assembly 5. One end of the floating rod 443 is slidably connected to the inclined guide rail 442. As the floating rod 443 slides on the inclined guide rail 442, the floating rod 443 will gradually rise. The floating rod 443 pushes the lifting and rotating plate 43 upward, thereby driving the positioning plate 42 to rotate counterclockwise and move downward to avoid the threading assembly 2, so that the pipe fitting can be processed normally.

[0028] Similarly, the inclined slide rail 442 can also form a downward inclined guide area, causing the lifting rotating plate 43 to rotate in the opposite direction, and the positioning plate 42 to rotate upward to avoid it.

[0029] The lifting rotating plate 43 is provided with a sliding groove, and the lifting rotating plate 43 is slidably connected to the floating rod 443 through the sliding groove. When the floating rod 443 pushes the lifting rotating plate 43 upward, the lifting rotating plate 43 rotates relative to the floating rod 443, and at the same time, the floating rod 443 slides relative to the lifting rotating plate 43, thereby realizing the slidably connected relationship between the two.

[0030] The positioning plate 42 and the lifting rotating plate 43 are distributed on different sides of the rotating shaft 41. When the lifting rotating plate 43 rotates upward counterclockwise, the positioning plate 42 rotates counterclockwise around the rotating shaft 41 to move away from the pipe fitting.

[0031] like Figure 4 and Figure 5 As shown, to ensure that the clamping assembly 3 stably clamps the workpiece, the clamping assembly 3 includes: The clamping base 31 is mounted on the drive assembly 5. At least two first linear drive units 32 are symmetrically arranged on the clamping base 31 for moving closer to or further away from each other. At least two grippers 33 are respectively set at the output ends of at least two first linear drive units 32, and are used to clamp the pipe at different positions when the at least two grippers 33 clamp the pipe.

[0032] By clamping the pipe fitting with two relatively moving jaws 33, the pipe fitting's axis is made collinear with the threading assembly 2 after being clamped, thus avoiding the need for readjustment of the pipe fitting or the threading assembly 2.

[0033] Specifically, to ensure stable clamping of the pipe fitting by the jaws 33, each jaw 33 is provided with several clamping tongues 331 with gaps distributed between them. The positions of the clamping tongues 331 and the gaps in two opposing jaws 33 are staggered to allow the two opposing jaws 33 to mesh with each other. The jaws 33 can stably clamp the pipe fitting through multi-point contact.

[0034] Each gripper 33 is provided with a gripping groove 3301 at the gripping tongue 331. The abutting surface between the gripping groove 3301 and the pipe fitting is a non-flat convex surface, wherein the inner surface of the gripping groove 3301 can be configured as a serrated surface.

[0035] Specifically, when the two opposing jaws 33 cooperate with each other, the two opposing clamping grooves 3301 are rectangular in shape. As the two jaws 33 approach each other, the rectangle formed by the two clamping grooves 3301 gradually shrinks, but the center of the rectangle remains unchanged. When clamping pipe fittings with different outer diameters, it can still ensure that the axis of the pipe fitting is collinear with the axis of the threading assembly 2, thus ensuring the concentricity of the two.

[0036] In addition, since the two opposing jaws 33 can interlock, the clamping tongue 331 can be offset to avoid each other, and the two clamping grooves 3301 can form a rectangle that can be further reduced, so as to adapt to pipes with smaller outer diameters.

[0037] To ensure stable clamping of the pipe fitting by the gripper 33, the first linear drive unit 32 is configured as a hydraulic cylinder, which can provide a stable clamping force for the pipe fitting. The hydraulic cylinder is only one implementation method and is not considered a limitation of the technical solution. Correspondingly, the first linear drive unit 32 can also be configured as an electric actuator, a pneumatic cylinder, or a motor-driven lead screw mechanism.

[0038] To ensure accurate machining of the pipe fitting, the clamping assembly 3 can detect the outer diameter of the pipe fitting. The clamping assembly 3 also includes: The displacement sensor 34 is installed on the cooperating grippers 33 and is used to detect the displacement of the pipe fitting after the two grippers 33 clamp it.

[0039] The displacement sensor 34 can calculate the outer diameter of the pipe by measuring the displacement of the two grippers 33. Once the outer diameter of the pipe is known, it can verify whether the pipe being gripped by the clamping assembly 3 is correct. At the same time, it can also verify whether the parameters set by the threading assembly 2 are correct.

[0040] The displacement sensor 34 can be configured as an infrared rangefinder or a magnetic grating displacement sensor.

[0041] Specifically, the controller can link the displacement sensor 34 and the threading assembly 2, allowing the threading assembly 2 to automatically adjust and set parameters according to the outer diameter of the pipe fitting. For example, after the clamping jaws 33 hold the pipe fitting, if the displacement sensor 34 detects that the outer diameter of the pipe fitting is 26mm, the controller can adjust the parameters on the threading assembly 2 so that the cutting tool on the threading assembly 2 forms a threading area for processing the 26mm pipe fitting.

[0042] To prevent the gripper 33 from clamping empty, the clamping assembly 3 also includes: Pipe fitting detector 35 is mounted on clamping seat 31 and is used to detect whether there is a pipe fitting on clamping seat 31. Pipe fitting detector 35 can be configured as an infrared detector, which emits an infrared beam and receives reflected signals to determine whether a pipe fitting is present.

[0043] Specifically, the gripper 33 will only move when the pipe detector 35 detects the presence of a pipe. Similarly, the two are linked together. Once the pipe is detected to be placed in the clamping seat 31 and remains there for a predetermined time, the gripper 33 will move relative to the pipe to clamp it.

[0044] like Figure 3 As shown, to ensure the accuracy of movement of the clamping component 3, the drive component 5 includes: The second linear drive unit 51 is mounted on the base 1; The conveyor seat 52 is located at the output end of the second linear drive unit 51 and is used to convey the clamped pipe fittings closer to or away from the threading assembly 2.

[0045] The second linear drive unit 51 is configured as a motor screw mechanism. The motor 511 is mounted on the machine base 1. One end of the screw 512 is connected to the output shaft of the motor 511, and the other end of the screw 512 is rotatably connected to the machine base 1. The conveyor seat 52 is threadedly connected to the screw 512. The motor 511 drives the screw to drive the conveyor seat 52 to move horizontally, thereby ensuring the precise movement of the clamping assembly 3 and the precise processing of pipe fittings by the threading assembly 2.

[0046] Specifically, the drive assembly 5 also includes a guide rail 53, which is horizontally mounted on the base 1. The conveyor seat 52 is slidably connected to the guide rail 53, and can achieve smooth movement under the guidance of the guide rail 53.

[0047] like Figure 1 and Figure 2 As shown, the base 1 is also provided with a chip guide section 11 below the threading assembly 2. The chip guide section 11 can guide the debris generated by threading the pipe fitting downwards. In addition, the chip guide section 11 is also provided with a through hole for coolant to pass through, and the through hole can separate coolant and debris.

[0048] The working principle of this single-sided pipe threading device is as follows: The conveyor seat 52 is in its initial position. The pipe fitting is manually placed between the opposing clamps 33, with one end of the fitting resting against the positioning plate 42. When the fitting detector 35 detects a fitting, the clamps 33 move relative to each other to clamp the fitting. The displacement sensor 34 detects the outer diameter of the fitting, and this outer diameter data can be used to verify the spacing between the threading cutters in the threading assembly 2. Simultaneously, as the conveyor seat 52 moves the clamping seat 31 and the fitting closer to the threading assembly 2, the floating... The moving rod 443 slides on the inclined slide rail 442 and pushes the positioning plate 42 to rotate counterclockwise through the floating rod 443. After the positioning plate 42 completes the positioning of the pipe fitting, it can avoid the position of threading the pipe fitting. After the pipe fitting is threaded, the conveying seat 52 drives the clamping seat 31 and the pipe fitting back to the initial position. During the process, the height of the floating rod 443 relative to the clamping seat 31 gradually decreases, which can drive the positioning plate 42 to rotate clockwise and reset to the state of abutting against the end face of the pipe fitting. Finally, the gripper 33 releases the pipe fitting, and the pipe fitting is manually unloaded.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pipe single-sided threading device, characterized in that, include: The base (1) is set on the ground; The threading assembly (2) is mounted on the machine base (1) and is used to process the outer surface of the pipe fitting to form external threads; The clamping assembly (3) is movably mounted on the base (1) for clamping and fixing the pipe fittings; A drive assembly (5) is provided on the base (1) for driving the clamping assembly (3) and the clamped pipe closer to or away from the threading assembly (2). The positioning component (4) is disposed on the clamping component (3). The positioning component (4) has a positioning part, which is rotatably disposed on the clamping component (3). When the pipe is placed on the clamping component (3), the positioning part abuts against the end face of the pipe near the threading component (2) to preposition the pipe. When the driving component (5) drives the pipe to approach the threading component (2), the positioning part separates from the pipe.

2. The pipe single-sided threading device as described in claim 1, characterized in that, The positioning component (4) includes: A rotating shaft (41) is rotatably mounted on the clamping assembly (3), passes through the clamping assembly (3) along the axial direction of the pipe, and extends from both ends away from the clamping assembly (3); The positioning plate (42) is fixedly installed at one end of the rotating shaft (41) that extends out of the clamping assembly (3) and is spaced apart from the clamping assembly (3) along the axial direction of the pipe fitting. It is used to pre-position the pipe fitting in the clamping assembly (3). The positioning plate (42) serves as the positioning part. The lifting rotating plate (43) is fixedly installed at the other end of the shaft (41) extending out of the clamping assembly (3); The sliding lifting mechanism (44) is slidably connected at one end to the lifting rotating plate (43) and slidably connected at the other end to the base (1). It is used to gradually rotate the positioning plate (42) away from the end face of the pipe fitting as the driving component (5) gradually approaches the threading component (2).

3. The pipe single-sided threading device as described in claim 2, characterized in that, The sliding lifting mechanism (44) includes: The fixed block (441) is fixedly mounted on the drive assembly (5) and is used to move synchronously with the drive assembly (5); An inclined slide rail (442) is fixedly mounted on the base (1) to form an upwardly inclined guide area; The floating rod (443) has its non-end slidably connected to the fixed block (441) in the vertical direction. One end of the floating rod (443) is slidably connected to the lifting rotating plate (43), and the other end of the floating rod (443) is slidably connected to the inclined slide rail (442). When the clamping assembly (3) approaches the threading assembly (2), the floating rod (443) drives the positioning plate (42) to rotate away from the pipe fitting.

4. The pipe single-sided threading device as described in claim 3, characterized in that, The positioning plate (42) and the lifting rotating plate (43) are distributed on different sides of the rotating shaft (41) and are used to rotate the positioning plate (42) counterclockwise around the rotating shaft (41) when the lifting rotating plate (43) rotates upward counterclockwise, so as to move away from the pipe fitting.

5. The pipe single-sided threading device as described in claim 1, characterized in that, The clamping assembly (3) includes: A clamping seat (31) is disposed on the drive assembly (5); At least two first linear drive units (32) are symmetrically arranged on the clamping seat (31) for moving closer to or further away from each other; At least two grippers (33) are respectively set at the output ends of at least two first linear drive units (32) to clamp the pipe at different positions when the at least two grippers (33) clamp the pipe.

6. The pipe single-sided threading device as described in claim 5, characterized in that, Each gripper (33) is provided with several gripping tongues (331) with gaps distributed in the two opposing grippers (33). The positions of the gripping tongues (331) and the gaps are staggered in the two opposing grippers (33) to make the two opposing grippers (33) bite each other.

7. The pipe single-sided threading device as described in claim 6, characterized in that, Each gripper (33) is provided with a gripping groove (3301) at the gripping tongue (331), and the gripping groove (3301) and the abutting surface of the pipe fitting are non-flat raised surfaces.

8. The pipe single-sided threading device as described in claim 5, characterized in that, The clamping assembly (3) further includes: A displacement sensor (34) is installed on the cooperating grippers (33) to detect the displacement of the pipe fitting after the two grippers (33) clamp it.

9. The pipe single-sided threading device as described in claim 5, characterized in that, The clamping assembly (3) further includes: The pipe fitting detector (35) is set on the clamping seat (31) and is used to detect whether there are pipe fittings on the clamping seat (31).

10. The pipe single-sided threading device as described in claim 1, characterized in that, The driving component (5) includes: The second linear drive unit (51) is mounted on the base (1); The conveyor seat (52) is located at the output end of the second linear drive unit (51) and is used to convey the clamped pipe fittings closer to or away from the threading assembly (2).

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