阅读说明：本技术 一种粉末涂料装箱清灰机构 (Powder coating vanning deashing mechanism ) 是由 陈文福 于 2020-11-12 设计创作，主要内容包括：本发明公开了一种粉末涂料装箱清灰机构,包括矩形基座,所述矩形基座上设有移动结构,所述矩形基座上设有位于移动结构上方的装箱结构,所述装箱结构上设有清灰结构；所述移动结构包括：条形滑轨、移动轮、承载架、支撑板以及轴承；所述矩形基座上壁面开设有第一条形凹槽,所述条形滑轨安置于第一条形凹槽内部,所述移动轮安置于第一条形凹槽内部。本发明的有益效果是,通过移动结构,能够升降移动,便于收集粉末的桶能够合理的调整使用位置,便于粉末收集,通过装箱结构,便于粉末装箱,无需人工手动操作装箱,通过清灰结构,便于装箱时,进行灰尘处理收集。(The invention discloses a powder coating boxing ash removal mechanism which comprises a rectangular base, wherein a moving structure is arranged on the rectangular base, a boxing structure positioned above the moving structure is arranged on the rectangular base, and an ash removal structure is arranged on the boxing structure; the moving structure includes: the device comprises a strip-shaped sliding rail, a moving wheel, a bearing frame, a supporting plate and a bearing; the upper wall surface of the rectangular base is provided with a first strip-shaped groove, the strip-shaped sliding rail is arranged inside the first strip-shaped groove, and the movable wheel is arranged inside the first strip-shaped groove. The dust collecting device has the advantages that the dust collecting device can be lifted and moved through the moving structure, the using position of the barrel convenient for collecting powder can be reasonably adjusted, the powder is convenient to collect, the powder is convenient to box through the box packing structure, the box packing is not required to be manually operated, and the dust is convenient to treat and collect when the box is packed through the dust cleaning structure.)

1. A powder coating boxing ash removal mechanism comprises a rectangular base (1), and is characterized in that a moving structure is arranged on the rectangular base (1), a boxing structure located above the moving structure is arranged on the rectangular base (1), and an ash removal structure is arranged on the boxing structure;

the moving structure includes: the device comprises a strip-shaped slide rail (2), a moving wheel (3), a bearing frame (4), a supporting plate (5) and a bearing (6);

the improved structure of the lead screw comprises a rectangular base (1), wherein a first strip-shaped groove is formed in the upper wall face of the rectangular base (1), a strip-shaped slide rail (2) is arranged in the first strip-shaped groove, a moving wheel (3) is arranged on the strip-shaped slide rail (2), a bearing frame (4) is arranged on the upper wall face of the moving wheel (3), a first circular groove is formed in the upper wall face of the bearing frame (4), a bearing (6) is arranged in the first circular groove, a stand column (7) is arranged on the bearing (6) in an inserted mode, a supporting plate (5) is arranged on the upper wall face of the stand column (7), a pair of fixing frames (8) are arranged on the upper wall face of the supporting plate (5), each fixing frame (8) is provided with the first strip-shaped groove, a lead screw module (9) is arranged in the.

2. The powder coating boxing ash removal mechanism of claim 1, wherein the boxing structure comprises: the device comprises a circular sleeve (11), a conical box body (12), a first servo motor (13) and a second servo motor (14).

The device is characterized in that a folding frame (15) is arranged on the side wall surface of the rectangular base (1), the circular sleeve (11) is arranged on the side wall surface of the folding frame (15), the conical box body (12) is arranged on the cylinder (16), the cylinder (16) inserted into the conical box body (12) is arranged on the folding frame (15), the first servo motor (13) is inserted into the cylinder (16), a threaded rod (17) is arranged at the driving end of the first servo motor (13), a support (18) crossing the cylinder (16) is arranged on the folding frame (15), a storage box (19) is arranged on the support (18), a feeding hole is formed in the cylinder (16), a discharging hole matched with the feeding hole is formed in the lower wall surface of the storage box (19), a feeding pipe (20) is connected between the feeding hole and the discharging hole, and a first circular through hole is formed in the upper wall surface of the conical box body (12), the second servo motor (14) is arranged in the first circular through hole, a connecting rod (21) is installed at the driving end of the second servo motor (14), a stirring sheet (22) is arranged on the connecting rod (21), and a discharge port is formed in the lower wall surface of the conical box body (12).

3. The powder coating vanning ash removal mechanism of claim 1, wherein the ash removal structure comprises: a third servo motor (23), a blade (24) and a collection box body (25);

a second circular through hole is formed in the side wall surface of the cylinder (16), a support plate (26) is inserted into the second circular through hole, the third servo motor (23) is arranged on the support plate (26), a second connecting rod (21) is arranged at the driving end of the third servo motor (23), blades (24) are arranged on the second connecting rod (21), the collecting box body (25) is arranged on the upper wall surface of the rectangular base (1), and a collecting pipe (27) extending into the collecting box body (25) is inserted into the second circular through hole.

4. The powder coating boxing dust removal mechanism as claimed in claim 1, wherein the support plate (5) is provided with a first guide rod (28) penetrating through the rectangular plate (10).

5. The ash removal mechanism for powder coating material boxing as claimed in claim 1, wherein the column (7) is sleeved with an annular gasket (32), the annular gasket (32) is provided with a first threaded opening, the bearing frame (4) is provided with a first threaded groove matched with the annular gasket (32), and a first screw lapped with the first threaded groove is inserted into the first threaded opening.

6. The powder coating boxing ash removal mechanism according to claim 1, wherein a strip-shaped through hole is formed in the side wall surface of the collection box body (25), a stop door (26) matched with the strip-shaped through hole is connected to the collection box body (25) through a hinge, an observation port is formed in the side wall surface of the collection box body (25), and transparent glass is inserted into the observation port.

7. The powder coating boxing ash removal mechanism as claimed in claim 2, wherein a pair of backing plates (27) is fixed in the circular sleeve (11), each backing plate (27) is provided with a third circular through hole, and the rectangular plate (10) is provided with a second guide rod inserted into the third circular through hole.

8. The ash removing mechanism for powder coating material packing according to claim 1, wherein a second threaded opening is formed on the upper wall surface of the supporting plate (5), a second threaded groove matched with the second threaded opening is formed on the rectangular base (1), and a second screw rod (28) overlapped with the second threaded groove is inserted in the second threaded opening.

9. The powder coating boxing ash removal mechanism as claimed in claim 1, wherein the upper wall surface of the bearing frame (4) is provided with an annular groove, the lower wall surface of the support plate (5) is provided with ejector rods (29) inserted into the annular groove, and the lower wall surface of each ejector rod (29) is provided with a roller (30) overlapped with the annular groove.

10. The powder coating boxing dust removal mechanism as claimed in claim 1, wherein a support rod (31) penetrating through the moving wheel (3) is arranged in the first strip-shaped groove.

Technical Field

The invention relates to the field of powder coating boxing, in particular to a powder coating boxing ash removal mechanism.

Background

When powder coating is packed into a box, powder is often placed for a long time to cause caking and is not easy to pack and collect, so that the powder coating cannot be continuously operated when being packed in a later period, the caking needs to be broken up manually, meanwhile, when the powder is packed into a box, the powder often splashes to enter air, and a large amount of dust is generated, so that reasonable ash removal is needed when powder is packed into a box, and the health of people cannot be influenced when workers perform employment.

Disclosure of Invention

The invention aims to solve the problems and designs a powder coating boxing ash removing mechanism.

The technical scheme of the invention is that the powder coating boxing ash removal mechanism comprises a rectangular base, wherein a moving structure is arranged on the rectangular base, a boxing structure positioned above the moving structure is arranged on the rectangular base, and an ash removal structure is arranged on the boxing structure;

the moving structure includes: the device comprises a strip-shaped sliding rail, a moving wheel, a bearing frame, a supporting plate and a bearing;

the bearing device comprises a rectangular base, and is characterized in that a first strip-shaped groove is formed in the upper wall surface of the rectangular base, a strip-shaped slide rail is arranged in the first strip-shaped groove, a moving wheel is arranged on the strip-shaped slide rail, a bearing frame is arranged on the upper wall surface of the moving wheel, a first circular groove is formed in the upper wall surface of the bearing frame, a bearing is arranged in the first circular groove, a stand column is inserted in the bearing, a support plate is arranged on the upper wall surface of the stand column, a pair of fixing frames are arranged on the upper wall surface of the support plate, a first strip-shaped groove is formed in each fixing frame, a lead screw module is inserted in each first.

The encasement structure comprises: the device comprises a circular sleeve, a conical box body, a first servo motor and a second servo motor;

the side wall surface of the rectangular base is provided with a folded frame, the circular sleeve is arranged on the side wall surface of the folded frame, the conical box body is arranged on the cylinder, the folded frame is provided with the cylinder inserted into the conical box body, the first servo motor is inserted into the cylinder, the driving end of the first servo motor is provided with a threaded rod, the folded frame is provided with a bracket crossing the cylinder, the bracket is provided with a storage box, the cylinder is provided with a feed inlet, the lower wall surface of the storage box is provided with a discharge outlet matched with the feed inlet, a feed pipe is connected between the feed inlet and the discharge outlet, the upper wall surface of the conical box body is provided with a first circular through hole, the second servo motor is arranged in the first circular through hole, the driving end of the second servo motor is provided with a connecting rod, and the connecting rod is provided with a stirring sheet, the lower wall surface of the conical box body is provided with a discharge opening.

The deashing structure includes: a third servo motor, blades and a collecting box body;

the side wall surface of the cylinder is provided with a second circular through hole, a support plate is inserted into the second circular through hole, the third servo motor is arranged on the support plate, the driving end of the third servo motor is provided with a second connecting rod, the second connecting rod is provided with a blade, the collecting box body is arranged on the upper wall surface of the rectangular base, and a collecting pipe extending into the collecting box body is inserted into the second circular through hole.

A first guide rod penetrating through the rectangular plate is installed on the supporting plate.

The stand column is sleeved with an annular gasket, a first threaded opening is formed in the annular gasket, a first threaded groove matched with the annular gasket is formed in the bearing frame, and a first screw which is in lap joint with the first threaded groove is inserted in the first threaded opening.

The side wall surface of the collecting box body is provided with a strip-shaped through hole, the collecting box body is connected with a stop door matched with the strip-shaped through hole through a hinge, the side wall surface of the collecting box body is provided with an observation port, and transparent glass is inserted into the observation port.

A pair of backing plates are fixed in the circular sleeve, a third circular through hole is formed in each backing plate, and a second guide rod inserted into the third circular through hole is installed on the rectangular plate.

The upper wall surface of the supporting plate is provided with a second threaded hole, the rectangular base is provided with a second threaded groove matched with the second threaded hole, and a second screw rod in lap joint with the second threaded groove is inserted in the second threaded hole.

The bearing frame is characterized in that an annular groove is formed in the upper wall surface of the bearing frame, ejector rods inserted into the annular groove are installed on the lower wall surface of the supporting plate, and rollers in lap joint with the annular groove are installed on the lower wall surface of each ejector rod.

And a support rod penetrating through the movable wheel is arranged in the first strip-shaped groove.

The powder coating boxing ash removal mechanism manufactured by the technical scheme of the invention can move up and down through the moving structure, a barrel convenient for collecting powder can reasonably adjust the use position, the powder collection is convenient, the powder boxing is convenient through the boxing structure, manual operation for boxing is not needed, and dust treatment and collection are convenient during boxing through the ash removal structure.

Drawings

FIG. 1 is a schematic structural diagram of a powder coating boxing ash removal mechanism according to the invention;

FIG. 2 is a side view of the ash removing mechanism for powder coating packing according to the present invention.

FIG. 3 is a top view of a carriage of the ash removal mechanism for powder coating boxing according to the present invention.

FIG. 4 is a side view of a circular sleeve of the ash removal mechanism for powder coating packing according to the present invention.

FIG. 5 is a top view of a supporting plate of the ash removing mechanism for powder coating packing according to the present invention.

FIG. 6 is an enlarged view of the structure A in FIG. 2 of the ash removal mechanism for powder coating packing according to the present invention.

In the figure, 1, a rectangular base; 2. a strip-shaped slide rail; 3. a moving wheel; 4. a carrier; 5. a support plate; 6. a bearing; 7. a column; 8. a fixed mount; 9. a lead screw module; 10. a rectangular plate; 11. A circular sleeve; 12. a conical box body; 13. a first servo motor; 14. a second servo motor; 15. a folding frame; 16. a cylinder; 17. a threaded rod; 18. a support; 19. a material storage box; 20. A feed pipe; 21. a connecting rod; 22. a stirring sheet; 23. a third servo motor; 24. a leaf; 25 a collection box body; 26. a support plate; 27. a collection pipe; 28. a first guide bar; 29. a top rod; 30. A roller; 31. a strut; 32. an annular gasket.

Detailed Description

The invention is described in detail with reference to the accompanying drawings, and as shown in fig. 1-6, a powder coating boxing ash removal mechanism comprises a rectangular base 1, wherein a moving structure is arranged on the rectangular base 1, a boxing structure positioned above the moving structure is arranged on the rectangular base 1, and an ash removal structure is arranged on the boxing structure; the moving structure includes: the device comprises a strip-shaped slide rail 2, a moving wheel 3, a bearing frame 4, a supporting plate 5 and a bearing 6; the upper wall surface of the rectangular base 1 is provided with a first strip-shaped groove, the strip-shaped slide rail 2 is arranged in the first strip-shaped groove, the moving wheel 3 is arranged on the strip-shaped slide rail 2, the bearing frame 4 is arranged on the upper wall surface of the moving wheel 3, the upper wall surface of the bearing frame 4 is provided with a first circular groove, the bearing 6 is arranged in the first circular groove, the bearing 6 is inserted with the upright post 7, the upper wall surface of the upright post 7 is provided with the support plate 5, the upper wall surface of the support plate 5 is provided with a pair of fixing frames 8, each fixing frame 8 is provided with the first strip-shaped groove, the lead screw modules 9 are inserted in the first strip-shaped grooves, and; the vanning structure includes: the device comprises a circular sleeve 11, a conical box body 12, a first servo motor 13 and a second servo motor 14; a folding frame 15 is arranged on the side wall surface of the rectangular base 1, a circular sleeve 11 is arranged on the side wall surface of the folding frame 15, a conical box body 12 is arranged on a cylinder 16, the folding frame 15 is provided with the cylinder 16 inserted into the conical box body 12, a first servo motor 13 is inserted into the cylinder 16, a threaded rod 17 is arranged on the driving end of the first servo motor 13, a bracket 18 crossing the cylinder 16 is arranged on the folding frame 15, a storage box 19 is arranged on the bracket 18, a feeding hole is arranged on the cylinder 16, a discharging hole matched with the feeding hole is arranged on the lower wall surface of the storage box 19, a feeding pipe 20 is connected between the feeding hole and the discharging hole, a first circular through hole is arranged on the upper wall surface of the conical box body 12, a second servo motor 14 is arranged in the first circular through hole, a connecting rod 21 is arranged on the driving end of the second servo motor 14, and a, a discharge outlet is arranged on the lower wall surface of the conical box body 12; the deashing structure includes: a third servo motor 23, blades 24 and a collection box 25; a second circular through hole is formed in the side wall surface of the cylinder 16, a support plate 26 is inserted in the second circular through hole, a third servo motor 23 is arranged on the support plate 26, a second connecting rod 21 is arranged at the driving end of the third servo motor 23, blades 24 are arranged on the second connecting rod 21, a collecting box body 25 is arranged on the upper wall surface of the rectangular base 1, and a collecting pipe 27 extending into the collecting box body 25 is inserted in the second circular through hole; a first guide rod 28 penetrating through the rectangular plate 10 is arranged on the supporting plate 5; an annular gasket 32 is sleeved on the upright post 7, a first threaded opening is formed in the annular gasket 32, a first threaded groove matched with the annular gasket 32 is formed in the bearing frame 4, and a first screw lapped with the first threaded groove is inserted in the first threaded opening; a strip-shaped through hole is formed in the side wall surface of the collection box body 25, a stop door 26 matched with the strip-shaped through hole is connected to the collection box body 25 through a hinge, an observation port is formed in the side wall surface of the collection box body 25, and transparent glass is inserted into the observation port; a pair of backing plates 27 is fixed in the circular sleeve 11, each backing plate 27 is provided with a third circular through hole, and the rectangular plate 10 is provided with a second guide rod inserted into the third circular through hole; a second threaded hole is formed in the upper wall surface of the supporting plate 5, a second threaded groove matched with the second threaded hole is formed in the rectangular base 1, and a second screw 28 lapped with the second threaded groove is inserted into the second threaded hole; an annular groove is formed in the upper wall surface of the bearing frame 4, ejector rods 29 inserted into the annular groove are installed on the lower wall surface of the supporting plate 5, and a roller 30 lapped with the annular groove is installed on the lower wall surface of each ejector rod 29; a support rod 31 penetrating the moving wheel 3 is arranged in the first strip-shaped groove.

The dust removing device is characterized by comprising a rectangular base 1, wherein a moving structure is arranged on the rectangular base 1, a boxing structure positioned above the moving structure is arranged on the rectangular base 1, and a dust removing structure is arranged on the boxing structure;

the moving structure includes: the device comprises a strip-shaped slide rail 2, a moving wheel 3, a bearing frame 4, a supporting plate 5 and a bearing 6;

the upper wall surface of the rectangular base 1 is provided with a first strip-shaped groove, the strip-shaped slide rail 2 is arranged in the first strip-shaped groove, the moving wheel 3 is arranged on the strip-shaped slide rail 2, the bearing frame 4 is arranged on the upper wall surface of the moving wheel 3, the upper wall surface of the bearing frame 4 is provided with a first circular groove, the bearing 6 is arranged in the first circular groove, the bearing 6 is inserted with a stand column 7, the upper wall surface of the stand column 7 is provided with a support plate 5, the upper wall surface of the support plate 5 is provided with a pair of fixing frames 8, each fixing frame 8 is provided with a first strip-shaped groove, the first strip-shaped groove is inserted with a lead screw module 9, a rectangular plate 10 is jointly arranged between the pair of lead screw modules 9, the rectangular plate can move up and down through a moving structure, the bucket convenient for collecting powder can reasonably adjust the using position, through the deashing structure, when the vanning of being convenient for, carry out dust and handle the collection.

In the embodiment, the movable dust removing device comprises a rectangular base 1, wherein a movable structure is arranged on the rectangular base 1, a boxing structure located above the movable structure is arranged on the rectangular base 1, and a dust removing structure is arranged on the boxing structure;

the moving structure includes: the device comprises a strip-shaped slide rail 2, a moving wheel 3, a bearing frame 4, a supporting plate 5 and a bearing 6;

the upper wall surface of the rectangular base 1 is provided with a first strip-shaped groove, the strip-shaped slide rail 2 is arranged in the first strip-shaped groove, the movable wheel 3 is arranged on the strip-shaped slide rail 2, the bearing frame 4 is arranged on the upper wall surface of the movable wheel 3, the upper wall surface of the bearing frame 4 is provided with a first circular groove, the bearing 6 is arranged in the first circular groove, the bearing 6 is inserted with the upright post 7, the upper wall surface of the upright post 7 is provided with the support plate 5, the upper wall surface of the support plate 5 is provided with a pair of fixing frames 8, each fixing frame 8 is provided with a first strip-shaped groove, the first strip-shaped groove is inserted with the lead screw;

it should be noted that: rectangular base 1 plays the supporting role, a removal wheel 3 for supporting on the bar slide rail 2, remove and take turns 3 and remove and control, it removes about 4 to drive to bear the frame, thereby the adjustment position of use, bear the backup pad 5 that stand 7 supported on the bearing 6 on the frame 4, play the supporting role, a rectangular plate 10 for supporting on the lead screw module 9, lead screw module 9 removes the end and erects to put and place, so it can erect to put the lift to remove the end, it uses the height to drive rectangular plate 10 lift adjustment, thereby place on rectangular plate 10 at the bucket of collecting powder coating, later transport the vanning structure below with the bucket through removing wheel 3, later lead screw module 9 removes the end and rises, insert the bucket inside circular sleeve 11, thereby be convenient for fall and carry out powder coating powder collection in the bucket.

The vanning structure includes: a circular sleeve 11, a conical box body 12, a first servo motor 13 and a second servo motor 14;

a folding frame 15 is arranged on the side wall surface of the rectangular base 1, a circular sleeve 11 is arranged on the side wall surface of the folding frame 15, a conical box body 12 is arranged on a cylinder 16, the folding frame 15 is provided with the cylinder 16 inserted into the conical box body 12, a first servo motor 13 is inserted into the cylinder 16, a threaded rod 17 is arranged on the driving end of the first servo motor 13, a bracket 18 crossing the cylinder 16 is arranged on the folding frame 15, a storage box 19 is arranged on the bracket 18, a feeding hole is arranged on the cylinder 16, a discharging hole matched with the feeding hole is arranged on the lower wall surface of the storage box 19, a feeding pipe 20 is connected between the feeding hole and the discharging hole, a first circular through hole is arranged on the upper wall surface of the conical box body 12, a second servo motor 14 is arranged in the first circular through hole, a connecting rod 21 is arranged on the driving end of the second servo motor 14, and, a discharge port is formed on the lower wall surface of the conical box body 12;

it should be noted that: the folding frame 15 plays a supporting role for supporting the circular sleeve 11, the circular sleeve 11 is used for supporting the conical box 12, the cylinder 16 arranged on the folding frame 15 is inserted into the conical box 12, the lower wall surface of the storage box 19 is connected with the cylinder 16 through the feeding pipe 20, so that the powder coating in the storage box 19 is guided into the cylinder 16 through the feeding pipe 20, the driving end of the first servo motor 13 rotates to drive the threaded rod 17 to rotate, the powder coating can be driven to move forwards through the rotation of the threaded rod 17 to enter the conical box 12, then the driving end of the second servo motor 14 on the conical box 12 rotates to drive the second connecting rod 21 to rotate, so that the stirring piece 22 on the second connecting rod 21 rotates, when the stirring piece 22 rotates, the stirring piece rotates to stir the powder coating powder in the conical box 12, and the powder coating powder is prevented from caking, preventing the powder coating from falling, so that the powder coating is scattered by stirring and reasonably falls into the barrel.

The deashing structure includes: a third servo motor 23, blades 24 and a collection box 25;

a second circular through hole is formed in the side wall surface of the cylinder 16, a support plate 26 is inserted in the second circular through hole, the third servo motor 23 is arranged on the support plate 26, a second connecting rod 21 is arranged at the driving end of the third servo motor 23, blades 24 are arranged on the second connecting rod 21, the collecting box body 25 is arranged on the upper wall surface of the rectangular base 1, and a collecting pipe 27 extending into the collecting box body 25 is inserted in the second circular through hole;

it should be noted that: the driving end of the third servo motor 23 rotates to drive the second connecting rod 21 to rotate, so that the blades 24 are reasonably rotated, and when the driving end of the third servo motor 23 rotates, gravitational wind is formed to drive powder flying in the air to enter the collecting box 25 through the collecting pipe 27.

As a preferable technical solution, further, a first guide rod 28 penetrating the rectangular plate 10 is installed on the support plate 5; the rectangular plate 10 is prevented from tilting while being lifted by the first guide bar 28.

As a preferable technical scheme, furthermore, the upright post 7 is sleeved with an annular gasket 32, the annular gasket 32 is provided with a first threaded opening, the bearing frame 4 is provided with a first threaded groove matched with the annular gasket 32, and a first screw lapped with the first threaded groove is inserted into the first threaded opening; the first screw is screwed, so that the use angle of the supporting plate 5 is convenient to fix.

As a preferred technical scheme, furthermore, a strip-shaped through hole is formed in the side wall surface of the collection box body 25, a shutter 26 matched with the strip-shaped through hole is connected to the collection box body 25 through a hinge, an observation port is formed in the side wall surface of the collection box body 25, and transparent glass is inserted into the observation port; through the strip-shaped through holes, dust in the collecting box body 25 is convenient to collect and clean.

As a preferable technical scheme, furthermore, a pair of backing plates 27 is fixed in the circular sleeve 11, each backing plate 27 is provided with a third circular through hole, and the rectangular plate 10 is provided with a second guide rod inserted into the third circular through hole; the barrel on the rectangular plate 10 can be conveniently and stably inserted into the circular sleeve 11 by inserting the second guide rod into the third circular through hole.

As a preferable technical scheme, further, the upper wall surface of the supporting plate 5 is provided with a second threaded hole, the rectangular base 1 is provided with a first threaded groove matched with the second threaded hole, and a second screw 28 lapped with the second threaded groove is inserted into the second threaded hole; the support plate 5 is fixed by screwing the first screw 28.

As a preferable technical scheme, furthermore, an annular groove is formed on the upper wall surface of the bearing frame 4, the lower wall surface of the supporting plate 5 is provided with ejector rods 29 inserted into the annular groove, and the lower wall surface of each ejector rod 29 is provided with a roller 30 lapped with the annular groove; by the rollers 30 being used to support the carriage 4, the rollers 30 are able to move without hindering the movement of the carriage 4.

As a preferable technical solution, furthermore, a strut 31 penetrating the moving wheel 3 is installed in the first strip-shaped groove; the strut 31 prevents the moving wheel 3 from tilting when moving.

The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions will all represent the principles of the present invention, and fall within the protection scope of the present invention.