A forming device for processing gas pipe joints

Abstract

The present application relates to the technical field of machining equipment, and discloses a forming device for processing gas pipe joints, including a lathe, a moving platform and a truss, wherein the truss is provided with a sliding head, the moving platform is provided with a connecting frame and a driving member, the driving member drives the connecting frame to move along the main axis, the moving block can move to one side of the connecting frame without affecting the position of the connecting frame movement, the connecting frame is connected to a connecting rod through a rotating head, the connecting rod is provided with a tightening head, and the rotating head can rotate the connecting rod to make the connecting rod horizontal or vertical. In the process of the connecting frame, the connecting rod and the tightening head cooperating to feed the blank into the automatic chuck, the movement of the connecting frame and the rotating head of the forming device for processing gas pipe joints is always consistent, and the reliability is high, and excessive pressure on the outer wall of the blank can be avoided when the chuck is clamped. At the same time, through the cooperation of the connecting rod and the tightening head, the blank can be flipped, and the processing can be completed in one time.

Description

Technical Field

[0001] The present application relates to the technical field of machining equipment, and in particular to a forming device for machining a gas pipe joint. Background Art

[0002] Gas pipe joints are used to connect gas pipelines and equipment. To ensure the safe transportation and use of gas, the quality of gas joints has high requirements.

[0003] When processing the gas pipe joint, the lathe is used to process the internal and external threads of the initially formed blank and trim the inner and outer walls. In order to ensure the processing speed, the lathe is usually used in conjunction with a truss manipulator. The truss manipulator reciprocates, continuously picking up the blank and taking away the processed gas joint.

[0004] Since the truss manipulator and the machine tool spindle are two independent operating systems, the axis of the blank may be different from the axis of the spindle when the manipulator clamps the blank. When the automatic chuck clamps the blank, the chuck will adjust the position of the blank so that its axis is consistent with the axis of the spindle, and the manipulator will release the blank after the chuck clamps the blank. When the blank deviates too much from the axis of the spindle, the outer wall of the blank will be subjected to a large force, causing it to deform and affecting the quality of the gas joint.

[0005] Secondly, although the truss manipulator has high flexibility and can quickly and accurately transport the blank to the corresponding position, when there is an error in the positioning of the truss, the blank cannot reach the correct position when the movement is not in place, which will cause the position of the chuck clamping the part to deviate and reduce the processing accuracy.

[0006] In addition, when the robot grabs the blank, the robot always clamps the same end of the blank and can only feed the same end of the blank into the chuck, while both ends of the gas pipe joint need to be processed. Therefore, the existing processing and molding device needs to process the blank twice before molding, which reduces production efficiency. Summary of the invention

[0007] The present application proposes a forming device for processing gas pipe joints. In the process of the connecting frame, connecting rod and expansion head cooperating to feed the blank into the automatic chuck, the movement of the connecting frame and the rotating head is always consistent, which can also reduce the pressure of the automatic chuck on the blank, avoid deformation of the blank, and improve the processing quality.

[0008] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a forming device for processing a gas pipe joint, comprising a lathe, a movable table and a truss, wherein the main shaft of the lathe is connected to an automatic chuck, a movable block is arranged on the movable table, the movable table and the movable block move along the X-axis and the Y-axis respectively, a plurality of groups of tool heads are arranged on the movable block, a sliding head is arranged on the truss, a connecting frame and a driving member are arranged on the movable table, the driving member drives the connecting frame to move along the main shaft axis, the movable block (4) is located between the automatic chuck (2) and the connecting frame (6), the movable block can be moved to a position that does not affect the movement of the connecting frame, the connecting frame is connected to a connecting rod via a rotating head, the connecting rod is provided with a tightening head, the rotating head can rotate the connecting rod to a horizontal or vertical position, and the connecting rod is provided with a tightening head. When the connecting rod is horizontal, it is in line with the main shaft. The sliding head is connected to a flip head through a telescopic rod. The flip head is connected to a clamping sleeve. The flip head can drive the clamping sleeve to rotate 180 degrees. The upper and lower ends of the clamping sleeve are open. When the blank is clamped by the clamping sleeve, the end of the expansion head can be inserted into the blank at any end. A movable blank tray is provided on one side of the movable platform. The blank tray is provided with positioning columns in a grid shape for placing the blank. The blank is initially sleeved on the positioning columns. The blank tray moves a row or a column each time. After each movement, the positioning columns of the row or the column are aligned with the clamping sleeve. The telescopic rod has two extension lengths. When the telescopic rod is extended to the first length, the clamping sleeve reaches the position of the positioning column. When the telescopic rod is extended to the second length, the clamping sleeve reaches the height of the expansion head.

[0009] Furthermore, the connecting rods are provided in two groups, and the two groups of connecting rods are perpendicular to each other.

[0010] Furthermore, a positioning plate is provided at the bottom of the expansion head, and the expansion head expands and fixes the blank only after the blank is placed on the positioning plate.

[0011] Furthermore, one group of the connecting rods and the expanding head is used exclusively for feeding one end of the blank into the automatic chuck, and another group of the connecting rods and the expanding head is used exclusively for feeding the other end of the blank into the automatic chuck.

[0012] Furthermore, the connecting frame includes a movable seat moving along the main shaft axis and an inclined rod fixedly connected to the movable seat. The inclined rod and the movable seat are arranged at an angle so that the rotating head is suspended and can rotate freely.

[0013] Furthermore, the connecting frame also includes a static positioning block and a dynamic positioning block. Static positioning blocks are provided on the upper and lower sides of the movable seat. When the connecting rod contacts the static positioning block on the upper side, the connecting rod is horizontal. When the connecting rod contacts the static positioning block on the lower side, the connecting rod is vertical. When the connecting rod contacts the dynamic positioning block, the connecting rod is horizontal. The dynamic positioning block can be moved to a position that does not hinder the movement of the connecting frame and the connecting rod. The rotating shaft of the rotating head is provided with damping, so that the current angle can be maintained when not driven.

[0014] Furthermore, the expansion head comprises an expansion tube, an expansion slider is arranged between the two expansion tubes, a telescopic bag is arranged in the middle of the expansion tube, and when the telescopic bag expands, the expansion slider moves to expand the blank.

[0015] Furthermore, the clamping sleeve comprises a sleeve, and an annular capsule is provided on the inner wall of the sleeve. The annular capsule expands or contracts to change the inner diameter of the sleeve, thereby clamping the blank.

[0016] Furthermore, a sensing head is provided above the annular bag for sensing whether it is in contact with the blank. The distance between the two sensing heads is larger than the outer diameter of the small end of the blank and smaller than the outer diameter of the large end of the blank. The position of the sensing head from the bottom is smaller than the length of the large and small ends of the blank. If one or both signals of the two sensing heads are abnormal, it is judged that the blank is placed upside down.

[0017] Beneficial effects of the present invention:

[0018] The present application provides a forming device for processing gas pipe joints. On the one hand, in the process of the connecting frame, the connecting rod and the expansion head cooperating to feed the blank into the automatic chuck, the movement of the connecting frame and the rotating head is always consistent, and it has high reliability. When fixing the blank, the position deviation of the blank axis may be small. On the other hand, the expansion head is not rigidly fixed when fixing the blank, and has a certain position adjustment ability, which can avoid excessive pressure on the outer wall of the blank when the chuck is clamped.

[0019] Through the cooperation of the connecting rod and the expansion head, the blank can be turned over, the processing can be completed in one time, and the production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute a part of the specification, illustrate the embodiments disclosed in the present application and, together with the description, serve to explain the principles of the embodiments disclosed in the present application.

[0021] The embodiments disclosed in the present application may be more clearly understood according to the following detailed description with reference to the accompanying drawings, in which:

[0022] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 It is a front view of the present invention;

[0024] Figure 3 For the present invention Figure 2 A magnified view of middle;

[0025] Figure 4 It is a schematic diagram of the expansion head in the present invention;

[0026] Figure 5 is a schematic diagram of a clamping sleeve in the present invention;

[0027] Figure 6 It is a front view of the clamping sleeve in the present invention.

[0028] In the figure: 1. lathe; 2. automatic chuck; 3. moving table; 4. moving block; 5. cutter head; 6. connecting frame; 61. moving seat; 62. inclined rod; 63. static positioning block; 64. dynamic positioning block; 7. driving member; 8. rotating head; 9. connecting rod; 10. expansion head; 101. expansion cylinder; 102. telescopic bag; 103. expansion slider; 11. truss; 12. sliding head; 13. telescopic rod; 14. turning head; 15. clamping sleeve; 151. sleeve; 152. ring bag; 153. induction head; 16. blank plate; 17. positioning plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. Embodiment 1

[0030] See also Figure 1-Figure 2A forming device for processing a gas pipe joint comprises a lathe 1, a moving table 3 and a truss 11. The main shaft of the lathe 1 is connected to an automatic chuck 2. The moving table 3 is provided with a moving block 4. The moving table 3 and the moving block 4 move along the X-axis and the Y-axis respectively. The moving table 3 and the moving block 4 are respectively connected to a driving structure, which can be a screw rod or a hydraulic rod. The moving block 4 is provided with a plurality of groups of cutter heads 5. In this embodiment, the cutter heads 5 are provided with four groups, which are respectively used for outer surface treatment, outer surface tapping, inner surface treatment and inner surface tapping. The truss 11 is arranged along the X-axis direction. At the top of the lathe 1, a sliding head 12 is provided on the truss 11, and the sliding head 12 has a driving structure that can move along the truss 11. A connecting frame 6 and a driving member 7 are provided on the moving platform 3. The driving member 7 drives the connecting frame 6 to move along the main axis. The moving block 4 can move to one side of the connecting frame 6 without affecting the position of the connecting frame 6. The moving block 4 has 5 stations. When it is in the first station, it does not affect the movement of the connecting frame 6. When it is in the 2-5 stations, the four sets of tool heads 5 are respectively in the station positions. The connecting frame 6 is connected to a connecting rod 9 through a rotating head 8. A tightening head 10 is provided on the rod 9, and the rotating head 8 can rotate the connecting rod 9 to make the connecting rod 9 horizontal or vertical. The connecting rod 9 is in line with the main shaft when it is horizontal, and perpendicular to the main shaft when it is vertical. The sliding head 12 is connected to the flip head 14 through the telescopic rod 13, and the flip head 14 is connected to the clamping sleeve 15. The center line of the clamping sleeve 15 intersects with the axis of the main shaft. The clamping sleeve 15 picks up the blank by clamping. The flip head 14 can drive the clamping sleeve 15 to rotate 180 degrees. The upper and lower ends of the clamping sleeve 15 are open. When the blank is clamped by the flip head 14, the tightening head 10 can be at any end. The moving platform 3 is inserted into the inside of the blank, and one side of the moving platform 3 is provided with a blank plate 16 that can move along the Y axis. The blank plate 16 is provided with positioning columns in a grid shape for placing the blank. The blank is initially sleeved on the positioning columns, and the blank plate 16 moves a row or a column each time. After each movement, the positioning columns of the row or the column are aligned with the clamping sleeve 15. The telescopic rod 13 has two extension lengths. When the telescopic rod 13 is extended to the first length, the clamping sleeve 15 reaches the position of the positioning columns. When the telescopic rod 13 is extended to the second length, the clamping sleeve 15 reaches the height of the expansion head 10.

[0031] When producing gas pipe joints, the blanks are sleeved on the positioning columns one by one, the telescopic rod 13 is extended to the first extension position, the clamping sleeve 15 is sleeved on the blank, and after the clamping sleeve 15 clamps the blank, the telescopic rod 13 contracts, the clamping sleeve 15 rises, and the sliding head 12 moves toward the connecting rod 9. When it moves to the leftmost side, the center line of the clamping sleeve 15 is colinear with the axis of the connecting rod 9, and the telescopic rod 13 is extended to the second extension position, so that the position of the clamping sleeve 15 is lowered, and the blank is sleeved on the expansion head 10, the expansion head 10 expands the blank, and the clamping sleeve 15 releases the blank. The telescopic rod 13 contracts, and the sliding head 12 moves to the position of the second grid positioning column to clamp the second blank. At the same time, the rotating head 8 rotates 90 degrees to make the connecting rod 9 horizontal, and the connecting frame 6 moves toward the automatic chuck 2 to the leftmost position, the automatic chuck 2 clamps the blank, the expansion head 10 contracts to release the blank, and returns to the original position, and the moving block 4 moves, so that each cutter head 5 arrives at the working position in turn to start processing the blank. After completing the processing procedure, the connecting rod 9 is adjusted to be horizontal, the connecting frame 6 moves, and the expansion head 10 is inserted into the blank and expands the blank. After the automatic chuck 2 releases the blank, the connecting frame 6 returns to its original position and makes the rotating head 8 vertical, the telescopic rod 13 extends to lower the clamping sleeve 15, and after the clamping sleeve 15 clamps the blank, the expansion head 10 releases the blank. After the clamping sleeve 15 is raised, it rotates 180 degrees to place the blank into the expansion head 10, and the processing of the other end of the blank is completed.

[0032] In order to reduce the time consumed by the clamping sleeve 15 to move the blank, two groups of connecting rods 9 are provided. The two groups of connecting rods 9 are perpendicular to each other, one for placing the processed blank and the other for receiving the blank transported by the clamping sleeve 15.

[0033] In order to ensure the consistency of the placement position of the blank, a positioning plate 17 is provided at the bottom of the expansion head 10. After the blank is placed on the positioning plate 17, the expansion head 10 expands and fixes the blank, that is, the clamping sleeve 15 releases the blank first, and the blank completely falls on the positioning plate 17, and then the expansion head 10 expands and tightens, ensuring that the axial position of the blank is consistent each time it is placed.

[0034] One set of connecting rods 9 and expansion heads 10 is used to feed one end of the blank into the automatic chuck 2, and the other set of connecting rods 9 and expansion heads 10 is used to feed the other end of the blank into the automatic chuck 2. When the blank is placed incorrectly, the clamping sleeve 15 can adjust the position of the blank.

[0035] During processing, the clamping sleeve 15 places the first blank on the right expansion head 10, and the rotating head 8 rotates 90 degrees to make the right expansion head 10 horizontal, and the blank is sent into the automatic chuck 2 and reset. At the same time, the clamping sleeve 15 returns to take the second blank and places the second blank on the left expansion head 10, waiting for the processing of one end of the first blank to be completed;

[0036] When one end of the first blank is processed, the rotating head 8 rotates again to make the expansion head 10 on the left horizontal. After the first blank is removed, the rotating head 8 rotates again to make the expansion head 10 on the right horizontal. The automatic chuck 2, the connecting frame 6 and the expansion head 10 cooperate to send the second blank into the automatic chuck 2. Then the connecting frame 6 is reset, and the rotating head 8 rotates to make the expansion head 10 on the left vertical. The clamping sleeve 15 takes off the first blank on the expansion head 10 on the left and rotates 180 degrees, and puts it back on the expansion head 10 on the left, waiting for one end of the second blank to be processed.

[0037] When one end of the second blank is processed, the rotating head 8 rotates again to make the right expansion head 10 horizontal, the automatic chuck 2, the connecting frame 6, the rotating head 8 and the expansion head 10 cooperate to take off the second blank first, and the left expansion head 10 feeds the first blank into the automatic chuck 2 for the second time, the connecting frame 6 is reset, the right expansion head 10 is vertical, the clamping sleeve 15 takes off the second blank, and rotates 180 degrees, and at the same time the rotating head 8 rotates to make the left expansion head 10 vertical, the clamping sleeve 15 puts the second blank on the left expansion head 10, and waits for the first blank to be processed;

[0038] After the first blank is processed, the expansion head 10 on the right takes off the first blank, and the expansion head 10 on the left puts the second blank into the automatic chuck 2 for the second time. The connecting frame 6 is reset and the expansion head 10 on the right is vertical. The clamping sleeve 15 takes off the first blank and then returns. The clamping sleeve 15 puts down the first blank and puts the third blank on the expansion head 10 on the right, waiting for the second blank to be processed.

[0039] After the second blank is processed, the expansion head 10 on the left first takes off the second blank, and then the expansion head 10 on the right feeds the third blank into the automatic chuck 2, and then the connecting frame 6 is reset, the expansion head 10 on the left remains vertical, and after the clamping sleeve 15 takes off the second blank, the expansion head 10 on the right remains vertical, and the clamping sleeve 15 returns to put down the second blank and brings the fourth blank, and puts the blank on the expansion head 10 on the right;

[0040] The above processing is repeated with two blanks in a group to continuously produce gas pipe joints. During this process, the expansion head 10 on the right is adapted to one end of the blank, and the positioning disk 17 on the right is pressed against one end of the blank to feed the blank into the automatic chuck 2 for the first time. The expansion head 10 on the left is adapted to the other end of the blank, and the positioning disk 17 on the left is pressed against the other end of the blank to feed the blank into the automatic chuck 2 for the second time, ensuring that when the blank is fed into the automatic chuck 2, each end of the blank maintains a relatively consistent expansion and tightening relationship and position relationship to ensure processing accuracy.

[0041] See also Figure 3The connecting frame 6 includes a moving seat 61 that moves along the main shaft axis and an inclined rod 62 that is fixedly connected to the moving seat 61. A limiting slide groove is provided on the moving platform 3. The inclined rod 62 slides in the slide groove. The inclined rod 62 and the moving seat 61 are at an angle of 45 degrees, so that the rotating head 8 is suspended, ensuring that the height from the rotating head 8 to the moving platform 3 is greater than the length from the rotating head 8 to the end of the tightening head 10, ensuring that the rotating head 8 can rotate freely.

[0042] The connecting frame 6 also includes a static positioning block 63 and a dynamic positioning block 64. The static positioning blocks 63 are provided on the upper and lower sides of the movable seat 61. When the connecting rod 9 contacts the static positioning block 63 on the upper side, the connecting rod 9 is horizontal. When the connecting rod 9 contacts the static positioning block 63 on the lower side, the connecting rod 9 is vertical. When the connecting rod 9 contacts the dynamic positioning block 64, the connecting rod 9 is horizontal. The dynamic positioning block 64 can be moved to a position that does not hinder the movement of the connecting frame 6 and the connecting rod 9. In this embodiment, the dynamic positioning block 64 is arranged on the movable block 4 and moves with the movable block 4. When it is necessary to adjust the rotating head 8 and the rotating head 8 to the position as shown in the figure, the rotating head 8 and the rotating head 8 are adjusted to the position as shown in the figure. Figure 2 When the angle is medium, first control the connecting frame 6 to retract, the connecting rod 9 rotates to the far right, the dynamic positioning block 64 moves to the position of the connecting rod 9, and the connecting rod 9 rotates and contacts the dynamic positioning block 64 before moving the dynamic positioning block 64 away. The rotating shaft of the rotating head 8 is provided with damping, and can maintain the current angle when not driven. The three limit positions formed by the static positioning block 63 and the dynamic positioning block 64 ensure that the angle of the rotating head 8 is adjusted to the right position.

[0043] See also Figure 4 The expansion head 10 includes an expansion tube 101, an expansion slider 103 is provided between the two expansion tubes 101, and a telescopic bag 102 is provided in the middle of the expansion tube 101. When the telescopic bag 102 expands, the expansion slider 103 moves to expand the blank.

[0044] See also Figure 5 and Figure 6 The clamping sleeve 15 includes a sleeve 151, and an annular bag 152 is provided on the inner wall of the sleeve 151. The annular bag 152 expands or contracts to change the inner diameter of the sleeve 151, thereby clamping the blank.

[0045] A sensing head 153 is provided above the annular capsule 152 to sense whether it is in contact with the blank. The distance between the two sensing heads 153 is greater than the outer diameter of the small end of the blank and smaller than the outer diameter of the large end of the blank. The distance between the sensing head 153 and the bottom is smaller than the length of the large and small ends of the blank. If one or both of the two sensing heads 153 have abnormal signals, it is determined that the blank is placed upside down. Figure 6When clamping the blank, the big end of the blank faces downward. If the blank is placed correctly, both sensing heads 153 are in contact with the blank. Otherwise, the blank is placed upside down with the small end facing downward. Even if the blank is biased to one side, the blank can only contact one sensing head 153. As long as the blank is placed upside down, at least one sensing head 153 will sense an abnormal signal. The sensing head 153 is used to detect whether the clamping sleeve 15 successfully clamps the blank, and is also used to determine the direction of the blank and whether the blank is placed upside down. If it is placed upside down, it is corrected in time by turning it over.

Claims

1. A forming device for processing a gas pipe joint, comprising a lathe (1), the lathe (1) being provided with a moving table (3) and a moving block (4) which move along an X-axis and a Y-axis respectively, the main shaft of the lathe (1) being connected to an automatic chuck (2), and the moving block (4) being provided with a plurality of sets of cutting heads (5); A truss (11), wherein a sliding head (12) is provided on the truss (11), characterized in that: The movable platform (3) is provided with a connecting frame (6) and a driving member (7), the driving member (7) drives the connecting frame (6) to move along the axis of the main shaft, the moving block (4) is located between the automatic chuck (2) and the connecting frame (6), the moving block (4) can be moved to a position that does not affect the movement of the connecting frame (6), the connecting frame (6) is connected to a connecting rod (9) via a rotating head (8), the connecting rod (9) is provided with a tightening head (10), the rotating head (8) can rotate the connecting rod (9) to a horizontal or vertical position, the connecting rod (9) is in line with the main shaft when horizontal, the sliding head (12) is connected to a turning head (14) via a telescopic rod (13), the turning head (14) is connected to a clamping sleeve (15), the turning head (14) can drive the clamping sleeve (15) to rotate 180 degrees, the upper and lower ends of the clamping sleeve (15) are open, when the blank is clamped by the clamping sleeve (15), the tightening head (10) is provided, The head (10) can be inserted into the blank at any end. A movable blank tray (16) is provided on one side of the movable platform (3). The blank tray (16) is provided with positioning columns in a grid shape for placing the blank. The blank tray (16) moves a row or a column each time. After each movement, the positioning columns in the row or the column are aligned with the clamping sleeve (15). The connecting rod (9) is provided with two groups. The two groups of connecting rods (9) are perpendicular to each other. A positioning disk (17) is provided at the bottom of the expansion head (10). When the clamping sleeve (15) places the blank on the expansion head (10), the clamping sleeve (15) is released first, and the expansion head (10) expands and fixes the blank. One group of the connecting rods (9) and the expansion head (10) is dedicated to feeding one end of the blank into the automatic chuck (2), and the other group of the connecting rods (9) and the expansion head (10) is dedicated to feeding the other end of the blank into the automatic chuck (2).

2. The forming device for processing a gas pipe joint according to claim 1, characterized in that: The connecting frame (6) comprises a movable seat (61) that moves along the main shaft axis and an inclined rod (62) that is fixedly connected to the movable seat (61); the inclined rod (62) and the movable seat (61) are arranged at an angle so that the rotating head (8) is suspended and the rotating head (8) can rotate freely.

3. The forming device for processing a gas pipe joint according to claim 2, characterized in that: The connecting frame (6) further comprises a static positioning block (63) and a dynamic positioning block (64). The static positioning blocks (63) are provided on both the upper and lower sides of the movable seat (61). When the connecting rod (9) contacts the static positioning block (63) on the upper side, the connecting rod (9) is horizontal. When the connecting rod (9) contacts the static positioning block (63) on the lower side, the connecting rod (9) is vertical. When the connecting rod (9) contacts the dynamic positioning block (64), the connecting rod (9) is horizontal. The dynamic positioning block (64) can be moved to a position that does not hinder the movement of the connecting frame (6) and the connecting rod (9). The rotating shaft of the rotating head (8) is provided with damping so that the current angle can be maintained when not driven.

4. The forming device for processing a gas pipe joint according to claim 1, characterized in that: The expansion head (10) comprises an expansion tube (101), an expansion slider (103) is provided between the two expansion tubes (101), a telescopic bag (102) is provided in the middle of the expansion tube (101), and when the telescopic bag (102) expands, the expansion slider (103) moves to expand the blank.

5. The forming device for processing a gas pipe joint according to claim 4, characterized in that: The clamping sleeve (15) comprises a sleeve (151), the inner wall of the sleeve (151) is provided with an annular bag (152), and the annular bag (152) expands or contracts to change the inner diameter of the sleeve (151), thereby clamping the blank.

6. The forming device for processing a gas pipe joint according to claim 5, characterized in that: A sensing head (153) is provided above the annular bag (152) for sensing whether it is in contact with the blank. The distance between the two sensing heads (153) is greater than the outer diameter of the small end of the blank and smaller than the outer diameter of the large end of the blank. The distance between the sensing heads (153) and the bottom is smaller than the length of the large and small ends of the blank. If one or both of the signals of the two sensing heads (153) are abnormal, it is determined that the blank is placed upside down.

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