阅读说明：本技术 一种管件全自动加工装备 (Full-automatic pipe fitting machining equipment ) 是由 蔡宝玉 叶晶 苏文成 刘勤 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种管件全自动加工装备,包括机床、内部设有主轴的主轴箱体和用于对工件进行加工的电动刀架,主轴端部设有用于夹持工件的夹持机构,机床上滑动装配有第一拖板和第二拖板,主轴箱体和第一拖板均有两个,两个主轴箱体分别左右对称安装在两个第一拖板上,第一拖板带动主轴箱体沿主轴轴向滑动,两个主轴箱体的主轴在同一条直线上,两个主轴箱体主轴上的夹持机构相互靠近分别夹持工件两端,第二拖板带动电动刀架沿垂直于主轴轴向的方向滑动,第一拖板左右两侧分别对称设有料架,每个料架分别包括位于上方的短工件料架和位于下方的长工件料架,长工件料架和短工件料架分别将长短工件送入主轴箱体进行加工以及从主轴箱体送出。(The invention discloses full-automatic pipe fitting machining equipment, which comprises a machine tool, a main shaft box body and an electric tool rest, wherein a main shaft is arranged in the main shaft box body, the electric tool rest is used for machining a workpiece, a clamping mechanism used for clamping the workpiece is arranged at the end part of the main shaft, a first carriage and a second carriage are assembled on the machine tool in a sliding mode, the main shaft box body and the first carriage are respectively provided with two main shaft boxes, the two main shaft boxes are respectively arranged on the two first carriages in a bilateral symmetry mode, the first carriage drives the main shaft box body to slide along the axial direction of the main shaft, the main shafts of the two main shaft box bodies are arranged on the same straight line, the clamping mechanisms on the main shafts of the two main shaft box bodies are close to each other and respectively clamp two ends of the workpiece, the second carriage drives the electric tool rest to slide along the direction perpendicular to the axial direction of the main shaft, material rests are respectively and symmetrically arranged on the left side and the right side of the first carriage, each material rest respectively comprises a short workpiece material rest arranged above and a long workpiece material rest arranged below the short workpiece, and a long workpiece material rest arranged above the long workpiece are respectively used for machining the main shaft box body, and the long workpiece are respectively used for machining the main shaft box for machining, and the long workpiece from the main shaft box body And (5) sending out the box body.)

1. The utility model provides a full automatic processing of pipe fitting is equipped, includes lathe, inside main shaft box that is equipped with the main shaft and is used for carrying out the electronic knife rest that processes to the work piece, the main shaft tip is equipped with the fixture who is used for centre gripping work piece, its characterized in that: the machine tool is provided with a first dragging plate and a second dragging plate in a sliding way, the main shaft box body and the first dragging plate are respectively provided with two main shaft box bodies, the two main shaft box bodies are respectively arranged on the two first dragging plates in a bilateral symmetry way, the first dragging plate drives the main shaft box bodies to slide along the axial direction of the main shaft, the main shafts of the two main shaft box bodies are arranged on the same straight line, clamping mechanisms on the main shafts of the two main shaft box bodies are mutually close, the second dragging plate is arranged at the front side or the rear side of the first dragging plate, an electric tool rest is arranged on the second dragging plate, the second dragging plate drives the electric tool rest to slide along the direction vertical to the axial direction of the main shaft, material racks are respectively arranged at the left side and the right side of the first dragging plate in a symmetry way, each material rack respectively comprises a short workpiece material rack arranged above and a long workpiece material rack arranged below, the long workpiece material rack comprises a supporting plate with a supporting roller and a connecting rod mechanism connected below the supporting plate, the supporting plate is horizontally arranged and the extending direction is parallel to the axial direction of the main shaft, the carrier roller is used for supporting a long workpiece, the connecting rod mechanism is used for adjusting the height position of the supporting plate to enable the axis of the long workpiece on the carrier roller to coincide with the axis of the main shaft, the short workpiece rack comprises a hanging rod parallel to the main shaft and a truss assembled below the hanging rod in a sliding mode, the truss is of a frame type structure, the bottom of the truss is connected with a short workpiece clamp, a fixed chuck used for fixing the short workpiece is arranged in the short workpiece clamp, and the truss drives the short workpiece clamp to move and adjusts the height position of the fixed chuck to enable the axis of the fixed chuck to coincide with the axis of the main shaft.

2. The pipe fitting full-automatic processing equipment of claim 1, wherein: the two electric tool rests and the two second plankers are respectively arranged on the two second plankers, and the two second plankers are positioned on the same side of the first planker.

3. The pipe fitting full-automatic processing equipment of claim 2, wherein: an inclined guide rail which is axially vertical to the spindle is arranged between the second carriage and the machine tool, one end of the inclined guide rail, which is far away from the first carriage, is higher than one end of the inclined guide rail, which is close to the first carriage, and the electric tool rest moves along the inclined guide rail to be close to or far away from the spindle box body.

4. The pipe fitting full-automatic processing equipment of claim 1, wherein: the long workpiece middle receiving and conveying mechanism is arranged above the two spindle box bodies and comprises a cross rod and a vertical rod assembled on the cross rod in an up-and-down sliding mode, a clamping piece used for clamping the long workpiece is fixedly installed at the lower end of the vertical rod, and the axis of the clamping piece is parallel to the axis of the spindle.

5. The pipe fitting full-automatic processing equipment of claim 4, wherein: and two ends of the cross rod are respectively and fixedly connected with the hanging rods of the two short workpiece racks.

6. The pipe fitting full-automatic processing equipment of claim 1, wherein: door-shaped supports are symmetrically arranged at two ends of the machine tool, and the hanging rods are fixedly connected to the door-shaped supports.

7. The pipe fitting full-automatic processing equipment of claim 1, wherein: a sliding part which slides back and forth on the hanging rod is arranged above the truss, the upper part of the truss is rotationally connected with the sliding part, and the lower part of the truss is rotationally connected with the short workpiece fixture.

8. The pipe fitting full-automatic processing equipment of claim 1, wherein: the connecting rod mechanism comprises a support, a transverse connecting rod and a vertical connecting rod, the support, the transverse connecting rod and the vertical connecting rod are located below the supporting plate, two ends of the vertical connecting rod are hinged between the transverse connecting rod and the supporting plate, a rotating shaft is arranged on the support, the middle of the vertical connecting rod penetrates through the rotating shaft to be matched with the rotating shaft in a rotating mode, a guide rod parallel to the vertical rod is fixedly connected onto the clamping piece, and the guide rod penetrates through the transverse rod.

9. The pipe fitting full-automatic processing equipment of claim 1, wherein: the supporting rollers are evenly distributed on the supporting plate at intervals, and a supporting seat is arranged between the two supporting rollers on the supporting plate.

10. The pipe fitting full-automatic processing equipment of claim 1, wherein: the clamping mechanism is an air chuck.

Technical Field

The invention relates to full-automatic pipe fitting machining equipment, and belongs to the technical field of pipe fitting machining equipment.

Background

The gun barrel belongs to a common pipe fitting on an oil gas well, the requirement is large, a common machining method is single and troublesome, the workload is large, and the efficiency is low. The pipe fitting machining device in the prior art usually comprises a machine tool, and a spindle box body and an electric tool rest which are arranged on the machine tool, wherein a spindle is arranged on the spindle box body, a clamping mechanism for clamping a pipe fitting is arranged at the end part of the spindle, the pipe fitting is clamped by the clamping mechanism during use, and the pipe fitting is machined by using a tool bit on the electric tool rest. When both ends of the pipe fitting need to be processed, one end of the pipe fitting needs to be turned around after being processed, so that the processed end of the pipe fitting is fixed on the clamping mechanism, and then the other end of the pipe fitting needs to be processed. Turning around is relatively easy for short workpieces, and turning around is very inconvenient for long workpieces, manual turning around is often needed, and the processing efficiency is seriously influenced. Therefore, the pipe fitting processing device in the prior art cannot realize automatic in and out of the pipe fitting, the processing process is troublesome, the workload is large, and the efficiency is low.

Disclosure of Invention

The invention aims to provide a full-automatic pipe fitting processing device capable of realizing automatic inlet and outlet of a pipe fitting and automatic processing of two ends of the pipe fitting, and aims to solve the technical problem that the two ends of the pipe fitting can be processed only by turning around in the pipe fitting processing device in the prior art.

The invention adopts the following technical scheme: a full-automatic pipe fitting machining device comprises a machine tool, a spindle box body and an electric tool rest, wherein a spindle is arranged in the spindle box body, the electric tool rest is used for machining a workpiece, a clamping mechanism used for clamping the workpiece is arranged at the end of the spindle, a first carriage and a second carriage are assembled on the machine tool in a sliding mode, the two spindle box bodies and the first carriage are respectively arranged on the two first carriages in a bilateral symmetry mode, the two spindle box bodies are respectively arranged on the two first carriages in a bilateral symmetry mode, the first carriage drives the spindle box body to slide along the axial direction of the spindle, spindles of the two spindle box bodies are arranged on the same straight line, the clamping mechanisms on the spindles of the two spindle box bodies are close to each other, the second carriage is located at the front side or the rear side of the first carriage, the electric tool rest is arranged on the second carriage, the second carriage drives the electric tool rest to slide along the direction perpendicular to the axial direction of the spindle, the left side and the right side of the first carriage are respectively and symmetrically provided with the material rest, each material rest comprises a short workpiece rest located above and a long workpiece rest located below the short workpiece, the long workpiece rack comprises a supporting plate with a supporting roller and a connecting rod mechanism connected below the supporting plate, the supporting plate is horizontally arranged, the extending direction of the supporting plate is parallel to the axis of a main shaft, the supporting roller is used for supporting a long workpiece, the connecting rod mechanism is used for adjusting the height position of the supporting plate to enable the axis of the long workpiece on the supporting roller to coincide with the axis of the main shaft, the short workpiece rack comprises a hanging rod parallel to the main shaft and a truss assembled below the hanging rod in a sliding mode, the truss is of a frame type structure, a short workpiece clamp is connected to the bottom of the truss, a fixing chuck used for fixing the short workpiece is arranged in the short workpiece clamp, and the truss drives the short workpiece clamp to move and adjusts the height position of the fixing chuck to enable the axis of the fixing chuck to coincide with the axis of the main shaft.

The two electric tool rests and the two second plankers are respectively arranged on the two second plankers, and the two second plankers are positioned on the same side of the first planker.

An inclined guide rail which is axially vertical to the spindle is arranged between the second carriage and the machine tool, one end of the inclined guide rail, which is far away from the first carriage, is higher than one end of the inclined guide rail, which is close to the first carriage, and the electric tool rest moves along the inclined guide rail to be close to or far away from the spindle box body.

The middle of two main shaft box bodies is equipped with long work piece and connects send mechanism, connects to send mechanism and includes the horizontal pole and the montant of assembly on the horizontal pole that slides from top to bottom in the middle of the long work piece, and montant lower extreme fixed mounting has the clamping piece that is used for pressing from both sides tight long work piece, and the axis of clamping piece is parallel with the main shaft axis, and still fixedly connected with is parallel with the montant guide bar on the clamping piece, and the guide bar is worn to adorn in the horizontal pole.

And two ends of the cross rod are respectively and fixedly connected with the hanging rods of the two short workpiece racks.

Door-shaped supports are symmetrically arranged at two ends of the machine tool, and the hanging rods are fixedly connected to the door-shaped supports.

A sliding part which slides back and forth on the hanging rod is arranged above the truss, the upper part of the truss is rotationally connected with the sliding part, and the lower part of the truss is rotationally connected with the short workpiece fixture.

The connecting rod mechanism comprises a support, a transverse connecting rod and a vertical connecting rod, the support is located below the supporting plate, the two ends of the vertical connecting rod are hinged between the transverse connecting rod and the supporting plate, a rotating shaft is arranged on the support, and the middle of the vertical connecting rod penetrates through the rotating shaft to be in running fit with the rotating shaft.

The supporting rollers are evenly distributed on the supporting plate at intervals, and a supporting seat is arranged between the two supporting rollers on the supporting plate.

The clamping mechanism is an air chuck.

The invention has the beneficial effects that: according to the invention, the first carriage on the machine tool drives the main shaft box body to move linearly left and right, so that the longitudinal feeding of a workpiece is realized, the main shaft rotates to drive the workpiece to rotate, the electric knife rest is driven by the second carriage to realize transverse feeding, and a pipe fitting clamped on the main shaft is processed. The workpiece is firstly fed by the left material rack, the long workpiece is automatically fed by the long workpiece material rack, the short workpiece is automatically fed by the short workpiece material rack, the workpiece is fed into the left spindle box body, the electric tool rest is used for processing the right end of the workpiece, after the processing is finished, the two spindle box bodies move towards the middle simultaneously, the clamping mechanisms on the two spindles stop contacting, the clamping mechanisms on the right side clamp the workpiece, the left clamping mechanisms loosen the workpiece, the right spindle box body moves backwards, the workpiece is pulled to the right side, the left end of the workpiece is processed, after the processing is finished, the workpiece is sent out from the right spindle box body by the material rack on the right side, and the long workpiece material rack and the short workpiece material rack respectively and automatically send out the long workpiece and the short workpiece. When the short workpiece enters and exits, the short workpiece is driven to move by the movement of the truss on the suspender, and the height position of the short workpiece clamp is changed by driving the short workpiece clamp to move by the truss with a frame structure, so that the short workpiece is aligned with the spindle hole and smoothly enters and exits from the spindle box body; when the long workpiece enters and exits, the long workpiece is driven to move by the rotation of the carrier roller, the height position of the supporting plate is changed by driving the supporting plate to move by the connecting rod mechanism, and the long workpiece can be conveniently aligned with the spindle hole and smoothly enters and exits from the spindle box body.

The automatic pipe fitting feeding and discharging device can realize automatic feeding and discharging of pipe fittings, the two ends of the pipe fittings can be automatically processed without turning around of the pipe fittings, the two ends of the pipe fittings can be continuously and automatically processed at one time, the labor intensity of workers is greatly reduced, and the processing precision and efficiency are high.

Preferably, the two electric tool rests respectively correspond to the two spindle boxes, and the two electric tool rests respectively process two ends of the workpiece.

Preferably, the oblique guide rail is used for guiding the movement of the electric tool rest, and one end of the oblique guide rail, which is far away from the first carriage, is higher than one end of the oblique guide rail, which is close to the first carriage, so that the workpiece can be conveniently machined.

Preferably, the long workpiece intermediate receiving and sending mechanism can feed the long workpiece in an auxiliary manner, when the long workpiece moves rightwards and is sent out, the clamping piece clamps and fixes the long workpiece, and the clamping piece clamps the long workpiece with the clamping mechanism of the main shaft in turn, so that the long workpiece moves rightwards and is sent out; when the long workpiece middle receiving and conveying mechanism is not needed, the vertical rod is lifted upwards to drive the clamping piece to move upwards, so that the clamping piece leaves a machining area, and the influence on the pipe fitting is avoided.

Preferably, the cross rod of the long workpiece intermediate receiving and conveying mechanism is connected between the hanging rods of the two short workpiece racks, so that the long workpiece intermediate receiving and conveying mechanism and the short workpiece racks form an integral rack structure.

Preferably, when the short workpiece rack is used, the sliding part moves on the suspension rod to drive the truss to move, so that the movement of the short workpiece clamp is realized, and the short workpiece can enter and exit; the height position of the short workpiece fixture is changed through the rotation of the truss, so that the short workpiece is aligned with the spindle, and the short workpiece can conveniently enter the spindle box body.

Preferably, the height position of the supporting plate is changed by the action of the connecting rod mechanism, and particularly, the transverse connecting rod can be pulled to move by adopting a driving mechanism such as an air cylinder, so that the vertical connecting rod rotates, the height of the supporting plate is changed, a long workpiece on the carrier roller is aligned with the spindle, and the long workpiece can conveniently enter the spindle box body.

Preferably, the supporting rollers uniformly distributed on the supporting plate stably support the long workpiece, and the supporting seat plays a role in auxiliary support for the long workpiece.

Drawings

FIG. 1 is a schematic structural diagram of a fully automatic pipe processing apparatus according to an embodiment of the present invention;

FIG. 2 is a plan view of the fully automated pipe machining apparatus of FIG. 1;

fig. 3 is a partial view of fig. 1.

In the figure: 1-a machine tool, 2-a spindle box, 21-a spindle, 22-a clamping mechanism, 3-an electric tool rest, 4-a first carriage, 5-a second carriage, 51-a slant guide rail, 6-a short workpiece rack, 61-a suspender, 62-a truss, 63-a short workpiece clamp, 64-a sliding part, 7-a long workpiece rack, 71-a supporting plate, 72-a carrier roller, 73-a supporting seat, 74-a link mechanism, 741-a supporting seat, 742-a transverse link, 743-a vertical link, 744-a rotating shaft, 8-a long workpiece intermediate receiving and conveying mechanism, 81-a transverse rod, 82-a vertical rod, 83-a clamping part, 84-a guide rod and 9-a portal support.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

As shown in fig. 1 to 3, the pipe fitting full-automatic processing equipment of the embodiment of the present invention includes a machine tool 1, a main spindle box 2 having a main spindle 21 therein, and an electric tool rest 3 for processing a workpiece, wherein a clamping mechanism 22 for clamping the workpiece is provided at an end of the main spindle 21, and the clamping mechanism 22 is a pneumatic chuck.

The machine tool 1 is provided with a first dragging plate 4 and a second dragging plate 5 in a sliding way, the number of the spindle boxes 2 and the number of the first dragging plates 4 are two, the two spindle boxes 2 are respectively arranged on the two first dragging plates 4 in a bilateral symmetry way, the first dragging plates 4 drive the spindle boxes 2 to axially slide along the spindles 21, the spindles 21 of the two spindle boxes 2 are on the same straight line, the clamping mechanisms 22 on the spindles 21 of the two spindle boxes 2 are close to each other, the second carriage 5 is positioned at the front side or the rear side of the first carriage 4, the electric tool rest 3 is arranged on the second carriage 5, the second carriage 5 drives the electric tool rest 3 to slide along the direction vertical to the axial direction of the main shaft 31, an inclined guide rail 51 which is vertical to the axial direction of the spindle 21 is arranged between the second carriage 5 and the machine tool 1, one end of the inclined guide rail 51, which is far away from the first carriage, is higher than one end of the inclined guide rail, which is close to the first carriage, and the electric tool rest 3 moves along the inclined guide rail 51 to be close to or far away from the spindle box 2. The two electric tool rests 3 and the two second plankers 5 are respectively arranged, the two electric tool rests 3 are respectively arranged on the two second plankers 5, and the two second plankers 5 are positioned on the same side of the first planker 4. The two electric tool rests respectively correspond to the two main spindle box bodies and respectively process two ends of a workpiece.

The left side and the right side of the first dragging plate 4 are symmetrically provided with material racks respectively, each material rack comprises a short workpiece material rack 6 located above and a long workpiece material rack 7 located below, each long workpiece material rack 7 comprises a supporting plate 71 with a supporting roller 72 and a connecting rod mechanism 74 connected below the supporting plate 71, the supporting plate 71 is horizontally arranged, the extending direction of the supporting plate 71 is parallel to the axis of the main shaft 21, the supporting rollers 72 are used for supporting the long workpieces, the supporting rollers drive the long workpieces to move when rotating, the connecting rod mechanisms 74 are used for adjusting the height positions of the supporting plates 71 to enable the axes of the long workpieces on the supporting rollers 72 to coincide with the axis of the main shaft 21, the supporting rollers 72 are uniformly distributed on the supporting plates 71 at intervals, and a supporting seat 73 is arranged between the two supporting rollers 72 on the supporting plates 71. The link mechanism 74 includes a support 741, a horizontal link 742 and a vertical link 743 which are located below the support plate 71, two ends of the vertical link 743 are hinged between the horizontal link 742 and the support plate 71, the support 741 is provided with a rotating shaft 744, and the middle of the vertical link 743 passes through the rotating shaft 744 to be rotatably matched with the rotating shaft. The transverse connecting rod drives the vertical connecting rod to move when moving, and the vertical connecting rod inclines to change the height position of the supporting plate, so that the long workpiece is aligned with the main shaft.

The short workpiece rack 6 comprises a hanging rod 61 parallel to the main shaft 21 and a truss 62 assembled below the hanging rod 61 in a sliding mode, the truss 62 is of a frame type structure, a short workpiece clamp 63 is connected to the bottom of the truss 62, a fixing chuck used for fixing a short workpiece is arranged in the short workpiece clamp 63, and the truss 62 drives the short workpiece clamp 63 to move and adjusts the height position of the fixing chuck to enable the axis of the fixing chuck to coincide with the axis of the main shaft 21. A sliding part 64 which slides back and forth on the hanging rod 61 is arranged above the truss 62, the upper part of the truss 62 is rotationally connected with the sliding part 64, and the lower part of the truss 62 is rotationally connected with the short workpiece clamp 63. By controlling the inclination degree of the truss, the height position of the short workpiece clamp is changed, so that the short workpiece is aligned with the main shaft.

The long workpiece intermediate receiving and conveying mechanism 8 is arranged above the two spindle box bodies 2, the long workpiece intermediate receiving and conveying mechanism 8 comprises a cross rod 81 and a vertical rod 82 assembled on the cross rod 81 in an up-and-down sliding mode, a clamping piece 83 used for clamping a long workpiece is fixedly mounted at the lower end of the vertical rod 82, and the axis of the clamping piece 83 is parallel to the axis of the spindle 21. The clamping member 83 is also fixedly connected with a guide rod 84 parallel to the vertical rod 82, and the guide rod 84 penetrates through the cross rod 81. And two ends of the cross rod 81 are respectively and fixedly connected with the hanging rods 61 of the two short workpiece racks 6. Door type support 9 is equipped with to the both ends symmetry of lathe 1, jib 61 fixed connection is on door type support 9.

The product of the invention adopts a novel machine tool structure: the two main shaft box bodies which are symmetrically arranged at left and right are fixed on a first carriage, the first carriage drives the two main shaft box bodies to move left and right on a machine tool through two rows of linear guide rails, so that the longitudinal feeding of a workpiece is realized, and a main motor fixed on the main shaft box bodies drives a main shaft to do main motion through synchronous belt transmission, namely, drives the workpiece to do rotary motion; the two symmetrically arranged electric tool rests are respectively fixed on the second carriage and move along the oblique guide rail along with the second carriage to realize transverse feeding, the two electric tool rests are respectively provided with eight stations and respectively correspond to respective main spindle box bodies to realize the processing of workpieces.

The long and short workpieces are processed by adopting different feeding and discharging modes respectively, and the feeding and discharging processes are as follows:

(1) long workpiece: the long workpiece is driven to enter the center height position of a main shaft hole of a main shaft box body by a long workpiece rack below the left side of the machine tool, the long workpiece is conveyed into the main shaft hole of the main shaft box body by the rotation of a carrier roller, and the pipe thread machining of one end of the long workpiece is realized by the clamping of a pneumatic chuck; after the processing is finished, the long workpiece is clamped by the pneumatic chucks of the long workpiece middle receiving and sending mechanism and the two spindle box bodies in turn, the long workpiece is driven to move right into the spindle hole of the second spindle box body, the other end of the long workpiece enters a processing area, and discharging are realized by the long workpiece rack on the right side of the machine tool after the processing is finished.

(2) Short workpiece: a short workpiece is driven to enter a central height position of a spindle hole of a spindle box body through a short workpiece material rack above the left side of the machine tool, the short workpiece is sent into the spindle box body through a short workpiece clamp arranged below a truss, and a pneumatic chuck of the spindle box body on the left side clamps the short workpiece to realize the processing of pipe threads at one end of the short workpiece; after the machining is finished, the pneumatic chucks on the two main shaft box bodies clamp the short workpieces in turn to enable the short workpieces to move into the main shaft hole of the main shaft box body on the right side, the other ends of the short workpieces enter a machining area, and discharging and unloading are achieved through the short workpiece rack on the right side of the machine tool after machining is finished.

In the embodiment, the long workpiece intermediate receiving and conveying mechanism is arranged above the main spindle box body, the long workpiece is alternately clamped by the pneumatic chuck of the main spindle box body and the long workpiece intermediate receiving and conveying mechanism, and the long workpiece is assisted to longitudinally move from one end to the other end, so that the machining and the length fixing of threads at two ends are realized.

In the above embodiments, only the thread machining of the pipe fitting is explained, and in actual use, the cutting tool on the electric tool rest can be switched according to different machining types, so as to machine the end face of the pipe fitting and bore the inner hole.

The automatic processing system of this embodiment verifies through trial-manufacturing, type test and user trial that the design of this product has reached the technical requirement of confirming in technical task book, can once only accomplish pipe fitting both ends screw thread processing in succession automatically, and the pitch error is within 0.005mm, and the length error is within 0.5 mm. The rack can accurately position the center of the pipe fitting, and the long workpiece rack and the short workpiece rack can respectively receive and deliver long and short pipe fittings, so that the short pipe fittings with the length of less than 600mm and the long pipe fittings with the length of 600 plus 6000mm can be continuously machined on the same machine tool, and the working efficiency is improved by more than 50%.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The term "connected" as used herein may mean either a direct connection between the components or an indirect connection between the components via other components.

The protection of the present invention is not limited to the above embodiments. Variations and advantages that may occur to those skilled in the art may be incorporated into the invention without departing from the spirit and scope of the inventive concept and the scope of the appended claims is intended to be protected.