CN108326977B

CN108326977B - Feeding device of sheet processing equipment

Info

Publication number: CN108326977B
Application number: CN201810136538.3A
Authority: CN
Inventors: 程楠
Original assignee: Taizhou Evok Machinery Co ltd
Current assignee: Taizhou Evok Machinery Co ltd
Priority date: 2017-12-12
Filing date: 2017-12-12
Publication date: 2021-03-23
Anticipated expiration: 2037-12-12
Also published as: CN109910111A; CN108326977A

Abstract

The invention provides a feeding device of sheet processing equipment, and belongs to the technical field of wood processing equipment. It has solved the poor problem of feeding stability among the current sheet material processing equipment. This feed arrangement of panel processing equipment, panel processing equipment include the frame, and feed arrangement includes the backup pad, and is equipped with in the frame and can carry out the push mechanism of propelling movement to the panel material in the backup pad, and the level still is equipped with the conveyer belt of at least double-phase parallel arrangement in the frame, and the backup pad is located between two adjacent conveyer belts, and is equipped with in the frame and can drives the backup pad and go up and down and make the elevating system who forms the difference in height between backup pad and the conveyer belt, works as the panel support can hold up the panel material level that is located the conveyer belt output when being higher than the. This panel processing equipment's feeding stability is better.

Description

Feeding device of sheet processing equipment

Technical Field

The invention belongs to the technical field of wood processing equipment, and relates to a feeding device of sheet processing equipment.

Background

The plate processing equipment has multiple types, and is mainly classified according to different processing functions, such as a plate splicing machine, an engraving machine, a joggling machine, a woodworking band sawing machine, a shaving machine, a sawing machine and the like, no matter which equipment is used, the plate is processed by a cutter, and the sawing machine needs to be matched with the feeding of the plate. The sawing machine is divided into full-automatic and semi-automatic, the saw blade makes rotary cutting movement, and at the same time, it makes feed movement along with the saw blade box, for example, the Chinese utility model patent application (application number: 200320120392.2) discloses the edge-sawing mechanism of edge-sawing machine, including motor mounted on the carriage of the machine frame, large axle seat, belt wheel, belt, large saw blade, also including motor and small axle seat respectively mounted on the side portion and top portion of carriage support of the machine frame, on the small axle seat a small saw disk axle is set, one end of the small saw disk axle is fixedly equipped with a small saw disk, the small saw disk is correspondent to the front portion of the large saw disk, and its movement direction is opposite to that of the large saw disk, and another end of the small saw disk axle is fixedly equipped with a small belt wheel, and the small belt wheel is connected with belt wheel on the axle end of motor shaft by means of belt, and the above-mentioned sawing machine needs to be pushed manually.

In order to feed wood, the Chinese patent application (application No. 201110413228.X) discloses a woodworking machinery platform, which comprises a support frame, a feeding area, a discharging area and a processing area, wherein the feeding area, the discharging area and the processing area are arranged on the support frame, the feeding area comprises a 90-degree V-shaped feeding slideway fixed on the support frame, a feeding conveyor belt is arranged on one side of the slideway, the discharging area comprises a 90-degree V-shaped discharging slideway fixed on the support frame, the feeding slideway and the discharging slideway both comprise a bottom plate and a side plate which form an included angle of 90 degrees with each other, the two bottom plates and the side plates are respectively arranged on the same surface, the bottom plates of the feeding conveyor belt and the feeding slideway are obliquely arranged, namely, the output end of the feeding conveyor belt is butted with the edge of the feeding slideway, the butted position is higher, a worker places a plate on the feeding conveyor belt, the feeding conveyor belt drives the plate, when the gravity center of the plate crosses the highest butted position, the plate can fall down, therefore, the position of the feeding conveyor belt and the feeding slide way is changed, however, in the position changing process, the plate material actively enters the feeding slide way through the action of gravity after the gravity center of the plate material crosses the highest point, and the plate material and the feeding slide way have large friction force and can block the movement of the plate material, so that for the feeding slide way, the mode that the plate material is shifted by overcoming the friction force through the action of gravity has large instability, the position of the hydraulic slide way clamp in the longitudinal direction of the frame is determined, if the plate material cannot be timely and accurately positioned, the hydraulic slide way clamp cannot stably clamp the plate material, and the subsequent processing quality is poor due to forced pushing of the plate material.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a feeding device of sheet processing equipment, which is used for solving the problem of poor feeding stability in the prior sheet processing equipment.

The purpose of the invention can be realized by the following technical scheme: the utility model provides a feed arrangement of sheet material processing equipment, sheet material processing equipment includes the frame, feed arrangement is including setting up in the frame and being used for supporting the backup pad of sheet material, and is equipped with the push mechanism that can carry out the propelling movement to the sheet material in the backup pad in the frame, it is equipped with at least double-phase parallel arrangement's conveyer belt still to go back the level in the frame, its characterized in that, above-mentioned backup pad is located between two adjacent conveyer belts, and is equipped with in the frame and can drives the backup pad and go up and down and make and form the elevating system of difference in height between backup pad and the conveyer belt, works as can hold up the sheet material level that is.

When the automatic plate lifting device works, a strip-shaped plate is horizontally placed at one feeding end of the conveying belts, so that the length direction of the plate is perpendicular to the conveying belts, at least two conveying belts support the plate, the conveying belts can horizontally convey the plate to the upper part of the supporting plate, the lifting mechanism drives the supporting plate to horizontally lift and horizontally support the plate on the conveying belts, the pushing mechanism can horizontally push the plate on the supporting plate to the next working procedure such as a processing platform, the supporting plate descends after the plate is completely pushed out of the supporting plate, then the conveying belts convey the next plate to the upper part of the supporting plate for the same flow, wherein the conveying belts can convey the plate to the upper part of the supporting plate and align the plate inevitably because the supporting plate is positioned between two adjacent conveying belts, the supporting plate can horizontally support the plate from the lower part of the plate, and the plate actively supporting plate is stable and reliable, the supporting plate is in a horizontal state, even if the processing platform vibrates during operation, the plate cannot deviate relative to the supporting plate due to gravity factors, so that the position of the plate is accurate after the plate is shifted to the supporting plate by the conveying belt, the stability of the plate shifting is improved, meanwhile, the plate is in a long strip shape, the supporting plate is horizontally arranged, the plate can be supported in the pushing process of the pushing mechanism, the bending deformation of the plate in the length direction due to lack of support is prevented, and the quality of subsequent procedures is guaranteed.

In the feeding device of the plate processing equipment, the supporting plate is in a long strip shape, the supporting plate is positioned between the output ends of the two adjacent conveying belts, and the supporting plate is perpendicular to the conveying belts. The supporting plate is long in strip shape, so that the supporting plate can adapt to long-strip-shaped plates, namely, the supporting plate can support the plates in the whole process in the pushing process of the pushing mechanism, the position precision in the plate pushing process and the subsequent process quality are improved, the conveying belt is perpendicular to the supporting plate, therefore, a plurality of plates can be placed on the conveying belt at the same time, the next plate can be conveyed to the upper portion of the supporting plate in time after the plates in the supporting plate are pushed, and the feeding continuity and efficiency are improved.

In the feeding device of the plate processing equipment, the conveyor belt comprises a belt body, a plurality of limiting plates are arranged on the outer side surface of the belt body along the length direction, the limiting plates are uniformly distributed, and the distance between every two adjacent limiting plates is larger than or equal to the width of the supporting plate. The two adjacent limiting plates are used for limiting one plate in the width direction, so that a plurality of plates can be placed on the conveying belt at the same time, the efficiency is improved, the limiting plates limit the positions of the plates, the condition that the position accuracy of the plates is influenced by displacement and the like on the plate early conveying belt is prevented, the distance between the two adjacent limiting plates is approximately equal to the width of the plates, the width of the supporting plate is smaller than the distance, and therefore the situation that the adjacent plates are displaced due to the fact that the supporting plate is brought to the adjacent plates when the supporting plate ascends is avoided, and the stability of feeding.

In foretell sheet material processing equipment's feed arrangement, the conveyer belt all includes that the level is fixed the bracing piece in the frame, the both ends of bracing piece are all rotated and are connected with the transfer gear, and above-mentioned area body cover is established on the transfer gear at bracing piece both ends, and the drive shaft is worn to be equipped with to fix between the transfer gear of output one end, has linked firmly driving motor on one of them bracing piece, and this driving motor is connected with the drive shaft. The conveyer belt all drives through a driving motor and a drive shaft to can guarantee the synchronous conveying of conveyer belt, make the sheet material on the conveyer belt parallel with the length direction of backup pad all the time, reduce the power supply simultaneously and also can improve holistic stability.

In the feed arrangement of foretell sheet material processing equipment, elevating system includes crane and a plurality of lift cylinder, the crane include the level setting and with conveyer belt looks vertically lifter, a plurality of branches have been linked firmly perpendicularly on the lifter, the backup pad links firmly on a plurality of branches, the lift cylinder is fixed in the frame, and the piston rod of lift cylinder is vertical upwards and link firmly mutually with the lifter. The backup pad is fixed on the crane, supports through many spinal branchs pole for the backup pad remains stable, and the crane carries out stable lift through a plurality of lift cylinders, and the stroke is accurate, and of course in actual course of working, elevating system also can adopt lead screw and screw cooperation to carry out the transmission and go up and down.

In foretell sheet material processing equipment's feed arrangement, the backup pad has a plurality of, and a plurality of backup pads arrange in proper order along length direction, has the clearance between the tip of two adjacent backup pads, and the conveyer belt output between two adjacent backup pads passes the clearance along backup pad width direction. The conveying belt comprises a plurality of supporting plates, wherein the supporting plates are oppositely spliced end to end, so that the conveying belt is suitable for long plates, correspondingly, the number of the conveying belts is one more than that of the supporting plates, the plates can be supported at multiple points in the length direction of the plates by the aid of the plurality of conveying belts, deformation of the plates is avoided, the output ends of the conveying belts penetrate through gaps between two adjacent supporting plates in the width direction of the supporting plates, and accordingly the plates are conveyed to the upper portions of the supporting plates to be still stably supported by the conveying belts until the supporting plates rise and.

In foretell sheet material processing equipment's feed arrangement, push mechanism includes the propelling movement seat, and this propelling movement seat is along backup pad length direction sliding connection in the frame, the fixed splint that have vertical setting on the propelling movement seat, it has movable splint still to follow backup pad width direction sliding connection on the propelling movement seat, should move the vertical setting of splint, and move and form down the clamp mouth between splint and the fixed splint, it is relative with the backup pad to press from both sides the material mouth, and can be with sheet material lifting to pressing from both sides in the material mouth when the backup pad rises, be equipped with on the propelling movement seat and drive the double-layered material cylinder that moves splint reciprocating motion. When the supporting plate descends, the fixed clamping plate and the movable clamping plate are both higher than the supporting plate, so that the plate can be conveyed to the position below the material clamping opening, then the supporting plate ascends, the plate can be lifted into the material clamping opening, the material clamping cylinder acts, the movable clamping plate and the fixed clamping plate are clamped on two edges of one end of the plate, then the pushing seat moves, the plate is horizontally pushed, the position of the plate cannot be influenced by the horizontal clamping mode of the movable clamping plate and the fixed clamping plate, and the feeding stability is improved.

In the feed arrangement of foretell sheet material processing equipment, press from both sides material cylinder level and link firmly on the propelling movement seat, linked firmly the arm lock on the piston rod that presss from both sides the material cylinder, this arm lock sets up along backup pad width direction, has linked firmly two guide rails on the arm lock downside, two guide blocks have been linked firmly on the propelling movement seat, guide block and guide rail sliding fit, it links firmly the tip at the arm lock to move splint. The guide rail is matched with the guide block, so that the clamping arm is kept stable, the movable clamping plate can be stably clamped on the plate, and the stability is improved.

In the feed arrangement of foretell sheet material processing equipment, the frame has linked firmly long banding guide holder at the lateral part of backup pad, have linked firmly horizontal slide rail along length direction on the guide holder, have linked firmly horizontal slider on the propelling movement seat, horizontal slider sliding connection is on horizontal slide rail, the lateral part of horizontal slide rail has linked firmly the rack along length direction, the propelling movement motor has linked firmly on the propelling movement seat, and this propelling movement motor has the gear through the speed reducer connection, the gear meshes with the rack mutually. The slider cooperates with the slide rail for the propelling movement seat keeps steady, and the cooperation structure of gear and rack also has compact structure, the transmission is stable, characteristics that the stroke precision is high, and certainly in the actual design in-process propelling movement mechanism also can adopt screw rod and swivel nut complex mode to drive the propelling movement seat and remove.

Compared with the prior art, the feeding device of the plate processing equipment has the following advantages:

1. the conveying belts can convey the plates to the upper portion of the supporting plate and align the plates, the supporting plate is avoided and can horizontally support the plates from the lower portion of the plates, high stability is achieved, the plates cannot deviate relative to the supporting plate, the positions of the plates after the plates are shifted to the supporting plate from the conveying belts are accurate, and stability of the plates during pushing on the supporting plate is improved.

2. Because the sheet material is rectangular form, and the backup pad is rectangular form and level setting, can carry out whole support to the sheet material at push mechanism's propelling movement in-process, prevent that the sheet material from because lack the bending deformation on the length direction that leads to of support, even when the processing platform operation and produce the vibration simultaneously, the backup pad still can keep and support the sheet material for the sheet material position is accurate.

Drawings

Fig. 1 is a schematic perspective view of a sheet processing apparatus.

Fig. 2 is a structural plan view of the panel processing apparatus.

Fig. 3 is a sectional view of the structure at a-a in fig. 2.

Fig. 4 is a front view of the construction of the slab processing apparatus.

Fig. 5 is an enlarged view of the structure at B in fig. 3.

Fig. 6 is an enlarged view of the structure at C in fig. 1.

Fig. 7 is a schematic perspective view of another perspective view of the sheet processing apparatus.

Fig. 8 is an enlarged view of the structure at D in fig. 1.

Fig. 9 is an enlarged view of the structure at E in fig. 3.

Fig. 10 is an enlarged view of the structure at F in fig. 7.

In the figure, 1, a frame; 11. a processing platform; 12. a vertical slide block; 2. a support plate; 3. a conveyor belt; 31. a support bar; 32. a belt body; 321. a limiting plate; 33. a transfer wheel; 34. a drive shaft; 35. a drive motor; 4. a lifting mechanism; 41. a lifting frame; 411. a lifting rod; 412. a strut; 413. a mounting seat; 414. a vertical slide rail; 42. a lifting cylinder; 5. a pushing mechanism; 51. a pushing seat; 511. a transverse slide block; 52. fixing the clamping plate; 53. a material clamping cylinder; 54. clamping arms; 541. a guide rail; 55. a movable clamping plate; 56. a material clamping port; 57. a guide block; 58. a pushing motor; 581. a speed reducer; 582. a gear; 6. a guide seat; 61. a transverse slide rail; 62. a rack.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, a feeding device of a sheet processing apparatus, the sheet processing apparatus includes a frame 1 and a processing platform 11, the processing platform 11 is located on the frame 1, and includes a cutting assembly such as a saw disc, which can cut a sheet. Referring to fig. 2, the feeding device includes four conveyor belts 3, the four conveyor belts 3 are disposed on the frame 1 and located at the side of the processing platform 11, the four conveyor belts 3 are disposed in parallel, the length direction of the conveyor belts 3 is perpendicular to the feeding direction of the processing platform 11, a support plate 2 is horizontally disposed between the output ends of two adjacent conveyor belts 3, so that the conveyor belts 3 and the support plates 2 are spaced, the support plates 2 are in a strip shape, the support plates 2 are perpendicular to the conveyor belts 3, the three support plates 2 are aligned along the length direction, that is, a gap is formed between the end portions of two adjacent support plates 2, the output end of the conveyor belt 3 between the two adjacent support plates 2 passes through the gap along the width direction of the support plate 2, the support plates 2 can be lifted, a lifting mechanism 4 is further disposed on the frame 1, the lifting mechanism 4 can drive the three support plates 2 to be lifted synchronously and horizontally, and, when the support plate 2 descends, the support plate 2 is lower than the upper side surface of the conveyor belt 3, so that when the support plate 2 is higher than the conveyor belt 3, the support plate 2 can horizontally lift the plate at the output end of the conveyor belt 3. The frame 1 is further provided with a pushing mechanism 5, and when the plate is horizontally supported by the supporting plate 2, the pushing mechanism 5 can push the plate to the processing platform 11 for processing procedures such as cutting.

Particularly, combine fig. 3, as shown in fig. 4, elevating system 4 includes crane 41 and a plurality of lift cylinder 42, crane 41 includes lifter 411 that the level set up, this lifter 411 is mutually perpendicular with conveyer belt 3, many spinal branchs pole 412 have been linked firmly perpendicularly on

lifter

411, 2 levels of backup pad are fixed in the upper end of branch 412, branch 412 supports backup pad 2 promptly, be fixed with mount pad 413 down on lifter 411, vertical slide rail 414 has been linked firmly on mount pad 413, and vertical slider 12 has been linked firmly on frame 1, vertical slide rail 414 and vertical slider 12 sliding fit, and a plurality of lift cylinders 42 all fix on frame 1, and lift cylinder 42's piston rod links firmly mutually up and with lifter 411. Combine fig. 5, fig. 6 shows, conveyer belt 3 all includes bracing piece 31 and the area body 32, the both ends of bracing piece 31 are all rotated and are connected with transfer gear 33, the area body 32 cover is established on two transfer gear 33, the transfer gear 33 of four bracing pieces 31 output one end is fixed to be worn to be equipped with a drive shaft 34, and be fixed with driving motor 35 on one of them bracing piece 31, this driving motor 35 is connected with drive shaft 34, have a plurality of limiting plates 321 along length direction on the lateral surface of the area body 32, these a plurality of limiting plate 321 evenly distributed, distance between two adjacent limiting plates 321 is greater than the width of backup pad 2.

Referring to fig. 7, 8 and 9, the pushing mechanism 5 includes a pushing base 51, a long guide base 6 is fixed on the frame 1 along the length direction of the support plate 2, the pushing base 51 is slidably connected to the guide base 6 along the length direction, a vertically arranged fixed clamp plate 52 is provided on the pushing base 51, the fixed clamp plate 52 is located on one side of the support plate 2, a clamping cylinder 53 is horizontally connected to the pushing base 51, the clamping cylinder 53 is arranged along the width direction of the support plate 2, a clamping arm 54 is fixedly connected to the piston rod of the clamping cylinder 53 along the length direction, two guide rails 541 are fixedly connected to the lower side of the clamping arm 54, two guide blocks 57 are fixedly connected to the pushing base 51, the guide blocks 57 are slidably fitted to the guide rails 541, a movable clamp plate 55 is vertically connected to the end of the clamping arm 54, the movable clamp plate 55 is located on the other side of the support plate 2, and the movable clamp plate 55 is opposite to the fixed clamp plate 52 and forms a downward clamping opening 56, the material clamping opening 56 is opposite to the support plate 2, and the sheet material on the support plate 2 can be positioned in the material clamping opening 56 when the support plate 2 is lifted. As shown in fig. 10, a transverse slide rail 61 is fixedly connected to the guide seat 6 along the length direction, a transverse slide block 511 is fixedly connected to the pushing seat 51, the transverse slide block 511 is slidably connected to the transverse slide rail 61, a rack 62 is fixedly connected to the side portion of the transverse slide rail 61 along the length direction, a pushing motor 58 is fixedly connected to the pushing seat 51, the pushing motor 58 is connected to a gear 582 through a speed reducer 581, and the gear 582 is meshed with the rack 62.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms frame 1, work platform 11, vertical slide 12, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. A feeding device of sheet processing equipment comprises a frame (1), the feeding device comprises a support plate (2) which is arranged on the frame (1) and used for supporting the sheet, a pushing mechanism (5) which can push the sheet on the support plate (2) is arranged on the frame (1), at least two parallel conveyor belts (3) are horizontally arranged on the frame (1), the feeding device is characterized in that the support plate (2) is positioned between two adjacent conveyor belts (3), the support plate (2) is in a long strip shape, the support plate (2) is vertical to the conveyor belts (3), two ends of the support plate (2) are respectively close to the two adjacent conveyor belts (3), and a lifting mechanism (4) which can drive the support plate (2) to lift and enable the support plate (2) and the conveyor belts (3) to form a height difference is arranged on the frame (1), work as backup pad (2) can hold up the sheet material level that is located conveyer belt (3) output when being higher than conveyer belt (3), push mechanism (5) have clamp material mouth (56) down, it is relative with backup pad (2) to press from both sides material mouth (56).

2. Feeding device for sheet processing plants according to claim 1, characterised in that said support plate (2) is positioned between the ends of the output of two adjacent conveyors (3).

3. The feeding device of the sheet processing equipment according to claim 2, characterized in that the conveyor belt (3) comprises a belt body (32), the outer side surface of the belt body (32) is provided with a plurality of limiting plates (321) along the length direction, the plurality of limiting plates (321) are uniformly distributed, and the distance between two adjacent limiting plates (321) is greater than or equal to the width of the supporting plate (2).

4. The feeding device of the plate processing equipment according to claim 3, characterized in that the conveyor belts (3) each comprise a support rod (31) horizontally fixed on the frame (1), the two ends of the support rod (31) are rotatably connected with a transmission wheel (33), the belt body (32) is sleeved on the transmission wheels (33) at the two ends of the support rod (31), a driving shaft (34) is fixedly arranged between the transmission wheels (33) at the output end, one of the support rods (31) is fixedly connected with a driving motor (35), and the driving motor (35) is connected with the driving shaft (34).

5. The feeding device of the plate processing equipment according to the claims 2, 3 or 4, characterized in that the lifting mechanism (4) comprises a lifting frame (41) and a plurality of lifting cylinders (42), the lifting frame (41) comprises a lifting rod (411) which is horizontally arranged and vertical to the conveyor belt (3), the lifting rod (411) is vertically fixedly connected with a plurality of support rods (412), the support plate (2) is fixedly connected with the plurality of support rods (412), the lifting cylinders (42) are fixed on the frame (1), and the piston rods of the lifting cylinders (42) are vertically upward and fixedly connected with the lifting rod (411).

6. The feeding device of sheet processing equipment according to claim 2 or 3 or 4, characterized in that the supporting plates (2) are provided with a plurality of supporting plates (2), the supporting plates (2) are sequentially arranged along the length direction, a gap is formed between the ends of two adjacent supporting plates (2), and the output end of the conveyor belt (3) between two adjacent supporting plates (2) passes through the gap along the width direction of the supporting plates (2).

7. The feeding device of the plate processing equipment according to claim 2, 3 or 4, characterized in that the pushing mechanism (5) comprises a pushing seat (51), the pushing seat (51) is slidably connected to the frame (1) along the length direction of the support plate (2), the pushing seat (51) is provided with a fixed clamping plate (52) which is vertically arranged, the pushing seat (51) is further slidably connected with a movable clamping plate (55) along the width direction of the support plate (2), the movable clamping plate (55) is vertically arranged, the movable clamping plate (55) and the fixed clamping plate (52) form the clamping opening (56), the plate can be lifted to the clamping opening (56) when the support plate (2) is lifted, and the pushing seat (51) is provided with a clamping cylinder (53) which can drive the movable clamping plate (55) to move to and fro.

8. The feeding device of the plate processing equipment according to claim 7, characterized in that the material clamping cylinder (53) is horizontally connected to the pushing base (51), a clamping arm (54) is connected to the piston rod of the material clamping cylinder (53), the clamping arm (54) is arranged along the width direction of the supporting plate (2), two guide rails (541) are connected to the lower side of the clamping arm (54), two guide blocks (57) are connected to the pushing base (51), the guide blocks (57) are in sliding fit with the guide rails (541), and the movable clamping plate (55) is connected to the end of the clamping arm (54).

9. The feeding device of the sheet processing equipment according to claim 7, characterized in that the frame (1) has fixed to it a long guide seat (6) at the side of the support plate (2), and the guide seat (6) has fixed to it a transverse slide rail (61) along the length direction, and the pushing seat (51) has fixed to it a transverse slide block (511), and the transverse slide block (511) is connected to the transverse slide rail (61) in a sliding manner, and the side of the transverse slide rail (61) has fixed to it a rack (62) along the length direction, and the pushing seat (51) has fixed to it a pushing motor (58), and this pushing motor (58) is connected with a gear (582) through a speed reducer (581), and the gear 582) is meshed with the rack (62).