A laser demolding device

Abstract

This invention relates to the technical field of mold cleaning devices, specifically a laser mold cleaning device, comprising a main body, a primary steering motor, a secondary steering motor, a primary connecting arm, a tertiary steering motor, a secondary connecting arm, a quaternary steering motor, a quinary steering motor, a sixth steering motor, and a laser mold cleaning mechanism. A connecting seat is fixedly mounted on the main body. The output shaft of the primary steering motor is fixedly connected to the connecting seat. The output shaft of the secondary steering motor is fixedly connected to the secondary connecting seat on the side wall of the primary steering motor. The primary connecting arm is connected to the primary fixed seat on the side wall of the secondary steering motor. Through the combined adjustment of the primary, secondary, tertiary, quaternary, quinary, and sixth steering motors, the laser mold cleaning mechanism can be flexibly adjusted in position, thereby ensuring comprehensive cleaning of the mold and guaranteeing a good cleaning effect.

Description

Technical Field

[0001] This invention relates to the technical field of mold clearing devices, specifically a laser mold clearing device. Background Technology

[0002] Laser mold cleaning devices are non-contact, high-precision, and environmentally friendly industrial mold cleaning equipment. Using high-energy pulsed lasers as the core, they accurately remove dirt from the mold surface without damaging the mold substrate. They are widely used in mold-intensive industries such as injection molding, die casting, rubber, and tire manufacturing. A Chinese patent document with publication number CN118700399B discloses a laser cleaning device for tire molds. The device includes a cleaning tank and a mold body. A dust collector is fixedly installed on one side of the top of the cleaning tank. A lifting block is slidably installed on the top of the cleaning tank. A sleeve made of transparent material is fixedly installed on the bottom of the lifting block. A cover plate is fixedly installed on the bottom of the sleeve. Multiple second gears are evenly rotatably installed on the top of the cover plate. A laser emitter is fixedly installed in the middle of the top of each second gear. A first gear and a first toothed ring are rotatably installed on the bottom of the lifting block. A cleaning brush is fixedly installed on the bottom edge of the first toothed ring. The cleaning side of the cleaning brush abuts against the surface of the sleeve. However, the mold cleaning device in the above solution is not convenient for angle adjustment, which results in incomplete cleaning of the mold at various angles, thus affecting the final mold cleaning effect. Therefore, the present invention proposes a laser mold cleaning device to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a laser mold clearing device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a laser mold clearing device, comprising: A laser mold clearing device main unit, on which a connecting base is fixedly installed; A primary steering motor, wherein the output shaft of the primary steering motor is fixedly connected to the connecting seat; A secondary steering motor, wherein the output shaft of the secondary steering motor is fixedly connected to a secondary connecting seat on the side wall of the primary steering motor; A primary connecting arm, which is connected to a primary fixed seat on the side wall of the secondary steering motor; A three-stage steering motor, wherein a secondary fixing seat is fixedly installed on the side wall of the three-stage steering motor, and the upper end of the primary connecting arm is fixedly connected to the secondary fixing seat; A secondary connecting arm, wherein a tertiary connecting seat is fixedly provided at the lower end of the secondary connecting arm, and the output shaft of the tertiary steering motor is fixedly connected to the tertiary connecting seat; A four-stage steering motor, wherein a three-stage fixing seat is fixedly installed on the side wall of the four-stage steering motor, and the upper end of the two-stage connecting arm is fixedly connected to the three-stage fixing seat; A five-stage steering motor, wherein a four-stage connecting seat is fixedly installed on the side wall of the five-stage steering motor, and the output shaft of the four-stage steering motor is fixedly connected to the four-stage connecting seat; A six-stage steering motor, wherein a five-stage connecting seat is fixedly installed on the side wall of the six-stage steering motor, and the output shaft of the five-stage steering motor is fixedly connected to the five-stage connecting seat; A laser mold clearing mechanism, wherein a six-stage connecting seat is fixedly installed on the side wall of the laser mold clearing mechanism, and the output shaft of the six-stage steering motor is fixedly connected to the six-stage connecting seat.

[0005] Preferably, the connector has a mounting groove, and a rotary connector clearance groove is provided at the port of the mounting groove. The output shaft of the primary steering motor is fixed in the mounting groove. A rotary connector is provided at the location of the rotary connector clearance groove. The inner ring of the rotary connector is fixedly connected to the output shaft, and the outer ring of the rotary connector does not contact the side wall of the rotary connector clearance groove.

[0006] Preferably, the inner lower surface of the rotary connector is provided with an input positive contact and an input negative contact, and the outer upper surface of the rotary connector is provided with an output positive terminal and an output negative terminal.

[0007] Preferably, during actual installation, the positive and negative output terminals of the rotary connector are fixedly connected to the primary steering motor, and the positive and negative output terminals are electrically connected to the primary steering motor. The positive and negative input contacts are electrically connected to the conductive posts at the bottom of the rotary connector's clearance groove, and the conductive posts at the bottom of the clearance groove are electrically connected to the main unit of the laser mold clearing device.

[0008] Preferably, the inner ring of the rotary connector has an alignment groove on its inner sidewall, and the output shaft end sidewall of the primary steering motor has an integrally formed alignment protrusion. During actual installation, the alignment protrusion is embedded into the alignment groove.

[0009] Preferably, the output shaft has a primary slot at its end, a secondary slot at the bottom of the primary slot, a primary movable slot on the outer wall of the output shaft, the bottom of the primary movable slot being connected to the primary slot via a primary guide rod slot, a primary movable head being movably installed in the primary movable slot, a primary guide rod being integrally formed on the inner end of the primary movable head, and a primary return spring being sleeved on the primary guide rod.

[0010] Preferably, a secondary movable groove is formed on the outer wall of the output shaft. The bottom of the secondary movable groove is connected to the bottom of the secondary groove opening through a secondary guide rod groove. A secondary movable head is movably installed in the secondary movable groove. A secondary guide rod is integrally formed on the inner end of the secondary movable head. A secondary return spring is sleeved on the secondary guide rod.

[0011] Preferably, the inner ring of the rotary connector has a secondary positioning groove on its inner sidewall, and the mounting groove has a primary positioning groove on its sidewall. The primary positioning groove and the secondary positioning groove are respectively provided with a primary movable groove and a secondary movable groove.

[0012] Preferably, a primary movable column is movably disposed in the primary slot, and a secondary movable column is movably disposed in the secondary slot. The primary and secondary movable columns are connected by a connecting column, and a force-bearing column is provided on the lower end face of the primary movable column. The primary movable column, secondary movable column, connecting column, and force-bearing column are integrally formed, and a spring groove is provided on the force-bearing column. A top support spring is installed in the spring groove. A primary force-bearing surface is cut on the side wall of the primary movable column, and a secondary and tertiary force-bearing surface are cut on the side wall of the secondary movable column.

[0013] Preferably, the ends of the primary guide rod, secondary guide rod, primary movable head, and secondary movable head are all hemispherical. Bolt holes are provided on the sidewall of the secondary slot, and positioning bolts are screwed into these holes. The end of the positioning bolt has an integrally formed top-supporting conical head. When the positioning bolt is actually tightened, the top-supporting conical head abuts against the tertiary force-bearing surface. At this time, the primary and secondary movable columns move downwards, allowing the secondary force-bearing surface to abut against the secondary guide rod, thus allowing the secondary movable head to insert into the secondary positioning slot. Simultaneously, the primary force-bearing surface abuts against the primary guide rod, allowing the primary movable head to insert into the primary positioning slot. After the positioning bolt is removed, the top-supporting spring returns to its original position, lifting the primary and secondary movable columns. At this time, the primary movable head completely disengages from the primary positioning slot, and the secondary movable head disengages from the secondary positioning slot.

[0014] Compared with the prior art, the beneficial effects of the present invention are: By setting up a laser mold cleaning device composed of a main laser mold cleaning unit, a primary steering motor, a secondary steering motor, a primary connecting arm, a tertiary steering motor, a secondary connecting arm, a quaternary steering motor, a quinary steering motor, a sixth steering motor, and a laser mold cleaning mechanism, and through the combined adjustment of the primary, secondary, tertiary, quaternary, quinary, and sixth steering motors, the laser mold cleaning mechanism can be flexibly adjusted in position, thereby ensuring that the laser mold cleaning mechanism cleans the mold comprehensively and effectively. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 This is a half-sectional view of the connector of the present invention; Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point B; Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point C; Figure 6 for Figure 4 Enlarged schematic diagram of the structure at point D; Figure 7 for Figure 4 Enlarged schematic diagram of the structure at point E in the middle; Figure 8 This is a schematic diagram of the rotary connector structure of the present invention; Figure 9 This is a schematic diagram of the primary and secondary movable columns of the present invention.

[0016] In the diagram: Laser mold clearing device main unit 1, primary steering motor 2, secondary steering motor 3, primary connecting arm 4, tertiary steering motor 5, secondary connecting arm 6, quaternary steering motor 7, quinary steering motor 8, sixth steering motor 9, laser mold clearing mechanism 10, connecting seat 11, output shaft 12, rotary connector 13, outer ring 14, inner ring 15, positive output terminal 16, negative output terminal 17, alignment slot 21, primary slot 22, secondary slot 23, primary movable column 24, secondary movable column 25. Moving column, 26. Primary force-bearing surface, 27. Secondary force-bearing surface, 28. Tertiary force-bearing surface, 29. Primary movable groove, 30. Primary guide rod groove, 31. Primary positioning groove, 32. Secondary movable groove, 33. Secondary guide rod groove, 34. Secondary positioning groove, 35. Primary movable head, 36. Primary guide rod, 37. Primary return spring, 38. Secondary movable head, 39. Secondary guide rod, 40. Secondary return spring, 41. Connecting column, 42. Force-bearing column, 43. Spring groove, 44. Top support spring, 45. Positioning bolt, 46. Top support conical head. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-9 The present invention provides the following three preferred embodiments: Example 1: A laser mold clearing device includes a main body 1, a primary steering motor 2, a secondary steering motor 3, a primary connecting arm 4, a tertiary steering motor 5, a secondary connecting arm 6, a quaternary steering motor 7, a quintet steering motor 8, a sixth-stage steering motor 9, and a laser mold clearing mechanism 10. A connecting seat 11 is fixedly mounted on the main body 1. The output shaft 12 of the primary steering motor 2 is fixedly connected to the connecting seat 11. The output shaft of the secondary steering motor 3 is fixedly connected to the secondary connecting seat on the side wall of the primary steering motor 2. The primary connecting arm 4 is connected to the primary fixed seat on the side wall of the secondary steering motor 3. A secondary fixed seat is fixedly mounted on the side wall of the tertiary steering motor 5. The upper end of the primary connecting arm 4 is fixedly connected to the secondary fixed seat. A tertiary connecting seat is fixedly mounted on the lower end of the secondary connecting arm 6. The output shaft of the tertiary steering motor 5 is fixedly connected to the tertiary connecting seat. A tertiary fixed seat is fixedly mounted on the side wall of the quaternary steering motor 7. The upper end of the secondary connecting arm 6 is fixedly connected to the tertiary fixed seat. The quaternary steering motor 8 is fixedly mounted on the side wall of the tertiary steering motor 9. The sixth-stage steering motor 9 is fixedly mounted on the tertiary connecting arm 10. A four-stage connecting seat is fixedly installed on the side wall of the laser mold cleaning mechanism 10. The output shaft of the four-stage steering motor 7 is fixedly connected to the four-stage connecting seat. A five-stage connecting seat is fixedly installed on the side wall of the six-stage steering motor 9. The output shaft of the five-stage steering motor 8 is fixedly connected to the five-stage connecting seat. A six-stage connecting seat is fixedly installed on the side wall of the laser mold cleaning mechanism 10. The output shaft of the six-stage steering motor 9 is fixedly connected to the six-stage connecting seat. The laser mold cleaning device is composed of the main body 1 of the laser mold cleaning device, the first-stage steering motor 2, the second-stage steering motor 3, the first-stage connecting arm 4, the third-stage steering motor 5, the second-stage connecting arm 6, the fourth-stage steering motor 7, the fifth-stage steering motor 8, the sixth-stage steering motor 9 and the laser mold cleaning mechanism 10. Through the combined adjustment of the first-stage steering motor 2, the second-stage steering motor 3, the third-stage steering motor 5, the fourth-stage steering motor 7, the fifth-stage steering motor 8 and the sixth-stage steering motor 9, the laser mold cleaning mechanism 10 can be flexibly adjusted in position, thereby ensuring that the laser mold cleaning mechanism 10 cleans the mold in all aspects and ensuring the cleaning effect of the mold.

[0019] Example 2: Based on Example 1, the connecting seat 11 is provided with an installation groove, and a rotary connector clearance groove is provided at the port of the installation groove. The output shaft 12 of the first-stage steering motor 2 is fixed in the installation groove. A rotary connector 13 is provided at the position of the rotary connector clearance groove. The inner ring 15 of the rotary connector 13 is fixedly connected to the output shaft 12, and the outer ring 14 of the rotary connector 13 does not contact the side wall of the rotary connector clearance groove.

[0020] The inner ring 15 of the rotary connector 13 has an input positive contact and an input negative contact on its lower side, and the outer ring 14 of the rotary connector 13 has an output positive terminal 16 and an output negative terminal 17 on its upper side.

[0021] In actual installation, the output positive terminal 16 and output negative terminal 17 of the rotary connector 13 are fixedly connected to the first-stage steering motor 2, and the output positive terminal 16 and output negative terminal 17 are electrically connected to the first-stage steering motor 2. The input positive terminal and input negative terminal are electrically connected to the conductive post at the bottom of the rotary connector's clearance groove, and the conductive post at the bottom of the rotary connector's clearance groove is electrically connected to the laser mold clearing device host 1.

[0022] The inner ring 15 of the rotary connector 13 has an alignment groove 21 on its inner side wall, and the output shaft 12 of the first-stage steering motor 2 has an integrally formed alignment protrusion on its end side wall. When the rotary connector 13 is actually installed, the alignment protrusion is embedded in the alignment groove 21. The alignment protrusion being embedded in the alignment groove 21 can ensure the connection stability between the output shaft 12 and the inner ring 15 of the rotary connector 13.

[0023] Example 3: Based on Example 2, a primary slot 22 is provided at the end of the output shaft 12, a secondary slot 23 is provided at the bottom of the primary slot 22, a primary movable slot 29 is provided on the outer side wall of the output shaft 12, the bottom of the primary movable slot 29 is connected to the primary slot 22 through a primary guide rod slot 30, a primary movable head 35 is movably installed in the primary movable slot 29, a primary guide rod 36 is integrally formed on the inner end of the primary movable head 35, and a primary return spring 37 is sleeved on the primary guide rod 36.

[0024] A secondary movable groove 32 is provided on the outer side wall of the output shaft 12. The bottom of the secondary movable groove 32 is connected to the bottom of the secondary groove 23 through the secondary guide rod groove 33. A secondary movable head 38 is movably installed in the secondary movable groove 32. A secondary guide rod 39 is integrally formed on the inner end of the secondary movable head 38. A secondary return spring 40 is sleeved on the secondary guide rod 39.

[0025] The inner ring 15 of the rotary connector 13 has a secondary positioning groove 34 on its inner side wall and a primary positioning groove 31 on its side wall. The primary positioning groove 31 and the secondary positioning groove 34 are respectively provided with corresponding primary movable groove 29 and secondary movable groove 32.

[0026] A primary movable column 24 is movably installed in the primary slot 22, and a secondary movable column 25 is movably installed in the secondary slot 23. The primary movable column 24 and the secondary movable column 25 are connected by a connecting column 41. A force-bearing column 42 is provided on the lower end face of the primary movable column 24. The primary movable column 24, the secondary movable column 25, the connecting column 41, and the force-bearing column 42 are integrally formed. A spring groove 43 is provided on the force-bearing column 42, and a top support spring 44 is installed in the spring groove 43. A primary force-bearing surface 26 is cut on the side wall of the primary movable column 24, and a secondary force-bearing surface 27 and a tertiary force-bearing surface 28 are cut on the side wall of the secondary movable column 25.

[0027] The ends of the primary guide rod 36, secondary guide rod 39, primary movable head 35, and secondary movable head 38 are all hemispherical. Bolt holes are provided on the sidewall of the secondary slot 23, and positioning bolts 45 are screwed into these holes. The end of the positioning bolt 45 has an integrally formed top-supporting conical head 46. When the positioning bolt 45 is actually tightened, the top-supporting conical head 46 abuts against the tertiary force-bearing surface 28. At this time, the primary movable column 24 and secondary movable column 25 move downwards, allowing the secondary force-bearing surface 27 to abut against the secondary guide rod 39, thereby allowing the secondary movable head 38 to insert into the secondary positioning slot 34. The primary force-bearing surface 26 rests against the primary guide rod 36, allowing the primary movable head 35 to insert into the primary positioning groove 31. After the positioning bolt 45 is removed, the top support spring 44 returns to its original position, lifting the primary movable column 24 and the secondary movable column 25. At this time, the primary movable head 35 is completely disengaged from the primary positioning groove 31, and the secondary movable head 38 is disengaged from the secondary positioning groove 34. By tightening the positioning bolt 45, the output shaft 12 can automatically and synchronously form a positioning connection with the inner ring 15 of the rotary connector 13 and the side wall of the mounting groove, thereby effectively improving the overall ease of disassembly and assembly of the structure.

[0028] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A laser mold clearing device, characterized in that: include: Laser mold clearing device main unit (1), and a connecting seat (11) is fixedly provided on the laser mold clearing device main unit (1). A primary steering motor (2) is provided, wherein the output shaft (12) of the primary steering motor (2) is fixedly connected to the connecting seat (11); The output shaft of the secondary steering motor (3) is fixedly connected to the secondary connecting seat on the side wall of the primary steering motor (2); A primary connecting arm (4) is connected to a primary fixed seat on the side wall of a secondary steering motor (3); The three-stage steering motor (5) has a secondary fixed seat fixedly installed on its side wall, and the upper end of the primary connecting arm (4) is fixedly connected to the secondary fixed seat. A secondary connecting arm (6) is provided with a tertiary connecting seat at the lower end of the secondary connecting arm (6), and the output shaft of the tertiary steering motor (5) is fixedly connected to the tertiary connecting seat; A four-stage steering motor (7) is fixedly provided with a three-stage fixing seat on its side wall, and the upper end of the two-stage connecting arm (6) is fixedly connected to the three-stage fixing seat. A five-stage steering motor (8) is provided with a four-stage connecting seat fixedly installed on the side wall of the five-stage steering motor (8), and the output shaft of the four-stage steering motor (7) is fixedly connected to the four-stage connecting seat; A six-stage steering motor (9) is provided with a five-stage connecting seat fixedly installed on the side wall of the six-stage steering motor (9), and the output shaft of the five-stage steering motor (8) is fixedly connected to the five-stage connecting seat; A laser mold clearing mechanism (10) is provided with a six-stage connecting seat fixedly installed on the side wall of the laser mold clearing mechanism (10), and the output shaft of the six-stage steering motor (9) is fixedly connected to the six-stage connecting seat.

2. The laser mold clearing device according to claim 1, characterized in that: The connecting seat (11) has an installation groove, and a rotary connector clearance groove is provided at the port of the installation groove. The output shaft (12) of the first-stage steering motor (2) is fixed in the installation groove. A rotary connector (13) is provided at the position of the rotary connector clearance groove. The inner ring (15) of the rotary connector (13) is fixedly connected to the output shaft (12), and the outer ring (14) of the rotary connector (13) does not contact the side wall of the rotary connector clearance groove.

3. The laser mold clearing device according to claim 2, characterized in that: The inner ring (15) of the rotary connector (13) is provided with an input positive contact and an input negative contact on its lower side, and the outer ring (14) of the rotary connector (13) is provided with an output positive terminal (16) and an output negative terminal (17) on its upper side.

4. The laser mold clearing device according to claim 3, characterized in that: When the rotary connector (13) is actually installed, the positive output terminal (16) and the negative output terminal (17) are fixedly connected to the first-stage steering motor (2), and the positive output terminal (16) and the negative output terminal (17) are electrically connected to the first-stage steering motor (2). The positive input contact and the negative input contact are electrically connected to the conductive post at the bottom of the rotary connector's clearance groove, and the conductive post at the bottom of the rotary connector's clearance groove is electrically connected to the main unit (1) of the laser mold clearing device.

5. A laser mold clearing device according to claim 4, characterized in that: The inner ring (15) of the rotary connector (13) has an alignment groove (21) on its inner side wall. The output shaft (12) of the first-stage steering motor (2) has an integrally formed alignment protrusion on its end side wall. When the rotary connector (13) is actually installed, the alignment protrusion is embedded in the alignment groove (21).

6. The laser mold clearing device according to claim 5, characterized in that: The output shaft (12) has a first-level slot (22) at its end. The bottom of the first-level slot (22) has a second-level slot (23). The outer side wall of the output shaft (12) has a first-level movable slot (29). The bottom of the first-level movable slot (29) is connected to the first-level slot (22) through a first-level guide rod slot (30). A first-level movable head (35) is movably installed in the first-level movable slot (29). A first-level guide rod (36) is integrally formed on the inner side of the first-level movable head (35). A first-level return spring (37) is sleeved on the first-level guide rod (36).

7. A laser mold clearing device according to claim 6, characterized in that: A secondary movable groove (32) is provided on the outer side wall of the output shaft (12). The bottom of the secondary movable groove (32) is connected to the bottom of the secondary groove opening (23) through the secondary guide rod groove (33). A secondary movable head (38) is movably installed in the secondary movable groove (32). A secondary guide rod (39) is integrally formed on the inner end of the secondary movable head (38). A secondary reset spring (40) is sleeved on the secondary guide rod (39).

8. A laser mold clearing device according to claim 7, characterized in that: The inner ring (15) of the rotary connector (13) has a secondary positioning groove (34) on its inner side wall, and the mounting groove has a primary positioning groove (31) on its side wall. The primary positioning groove (31) and the secondary positioning groove (34) are respectively set to correspond to the primary movable groove (29) and the secondary movable groove (32).

9. A laser mold clearing device according to claim 8, characterized in that: A primary movable column (24) is movably arranged in the primary slot (22), and a secondary movable column (25) is movably arranged in the secondary slot (23). The primary movable column (24) and the secondary movable column (25) are connected by a connecting column (41). A force-bearing column (42) is provided on the lower end face of the primary movable column (24). The primary movable column (24), the secondary movable column (25), the connecting column (41), and the force-bearing column (42) are integrally formed. A spring groove (43) is provided on the force-bearing column (42). A top support spring (44) is installed in the spring groove (43). A primary force-bearing surface (26) is cut on the side wall of the primary movable column (24), and a secondary force-bearing surface (27) and a tertiary force-bearing surface (28) are cut on the side wall of the secondary movable column (25).

10. A laser mold clearing device according to claim 9, characterized in that: The ends of the first-level guide rod (36), the second-level guide rod (39), the first-level movable head (35), and the second-level movable head (38) are all hemispherical. Bolt holes are provided on the side wall of the second-level slot (23), and positioning bolts (45) are screwed into the bolt holes. The end of the positioning bolt (45) is integrally formed with a top support cone head (46). When the positioning bolt (45) is actually tightened, the top support cone head (46) abuts against the third-level force-bearing surface (28), and at this time, the first-level movable column (24) and the second-level movable column (25) move down so that the second-level force-bearing surface (27) can be lowered. The first-stage moving head (38) is inserted into the second-stage positioning groove (34) by pressing against the second-stage guide rod (39). At this time, the first-stage force-bearing surface (26) is pressed against the first-stage guide rod (36), allowing the first-stage moving head (35) to be inserted into the first-stage positioning groove (31). After the positioning bolt (45) is disassembled, the top support spring (44) resets and lifts the first-stage moving column (24) and the second-stage moving column (25). At this time, the first-stage moving head (35) is completely disengaged from the first-stage positioning groove (31), and the second-stage moving head (38) is disengaged from the second-stage positioning groove (34).

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