CN218535548U - Feeding device for PE pipe extruder - Google Patents

Abstract

The utility model relates to a throw material device for PE pipe extruder relates to the field of tubular product production facility, and it is including side feeding machine and support, the support includes backup pad, lift post, sleeve and bottom plate, the terminal surface of backup pad one side with the side feeding machine is connected, the opposite side with lift post fixed connection, the sleeve slip cap is established the lift post is kept away from the one end of backup pad, the sleeve is kept away from the one end of lift post with bottom plate fixed connection, be provided with on the sleeve be used for with the sleeve with the locking piece of lift post locking, be provided with on the bottom plate and be used for adjusting the adjustment mechanism of bottom plate and ground relative angle. This application has improved because the ground unevenness leads to the effect of the unable quick connection's of side feeding machine and main engine barrel problem.

Description

Feeding device for PE pipe extruder

Technical Field

The application relates to the field of pipe production equipment, in particular to a feeding device for a PE pipe extruder.

Background

The PE pipe is made of polyethylene as main raw material, antioxidant, carbon black and coloring material. At present, the processing and forming mode of the PE pipe is extrusion forming. Extrusion molding is a processing method for making various section products or semi-products by continuously passing materials through a machine head through the action between a charging barrel and a screw rod of an extruder while heating and plasticizing and pushing the materials forwards by the screw rod, and mainly comprises the processes of feeding, melting and plasticizing, extrusion molding, shaping, cooling, traction, cutting and the like. The screw extruder depends on the pressure and the shearing force generated by the rotation of the screw, so that materials can be fully plasticized and uniformly mixed, and finally, the materials are molded through a neck mold.

Chinese patent with application number CN201920835248.8 in the related art proposes a side feeding extruder with improved connection mode, which comprises an extruder and a side feeding machine, wherein a main barrel is arranged on the upper part of the extruder, the main barrel is close to one side of the side feeding machine and fixedly connected with a transition block, a locking bolt is arranged outside the transition block, a front barrel is arranged at one end of the side feeding machine along the discharging direction, the end part of the front barrel is rotatably connected with a rotary pressing block through a fastening screw, the locking bolt passes through an arc-shaped notch arranged at the end part of the front barrel and is clamped with the rotary pressing block, the side feeding machine further comprises a motor, a speed reducer, a transmission distribution box, a feeding barrel and a support vehicle, the motor is sequentially connected with the speed reducer and the transmission distribution box in a transmission manner, a screw assembly is arranged inside the feeding barrel and fixedly connected with an output shaft of the transmission distribution box, the support vehicle is positioned below the side feeding machine, and the top of the support vehicle is fixedly connected with the bottom of the side feeding machine through a support rod.

For the related technologies, when the side feeder needs to be connected with the main barrel, the rotary pressing block needs to be aligned with the transition block, then the position of the side feeder is kept stable, and then the rotary pressing block is connected with the transition block through the locking bolt. When there is the problem of unevenness in the ground of placing the side feeder and the ground of placing the main frame barrel, because the height of support car is fixed, rotatory briquetting just can not be with the quick alignment of transition piece this moment, leads to the unable high-speed joint of side feeder and main frame barrel.

SUMMERY OF THE UTILITY MODEL

In order to improve because the ground unevenness leads to the unable quick connect's of side feeding machine and main engine barrel problem, this application provides a throw material device for PE pipe extruder.

The application provides a throw material device for PE pipe extruder adopts following technical scheme:

the utility model provides a throw material device for PE pipe extruder, includes side feeding machine and support, the support includes backup pad, lift post, sleeve and bottom plate, the terminal surface of backup pad one side with the side feeding machine is connected, the opposite side with lift post fixed connection, the sleeve slip cap is established the lift post is kept away from the one end of backup pad, the sleeve is kept away from the one end of lift post with bottom plate fixed connection, be provided with on the sleeve be used for with the sleeve with the locking piece of lift post locking, be provided with on the bottom plate and be used for adjusting the adjustment mechanism of bottom plate and ground relative angle.

Through adopting above-mentioned technical scheme, when needs will incline the feeding machine and be connected with the main engine barrel, adjust the relative angle on bottom plate and ground through adjustment mechanism earlier, make the bottom plate level, make the lift post be close to again/keep away from the bottom plate, make the backup pad reach required height, pass through the locking piece locking with lift post and sleeve again, realize the regulation to the support. At the moment, the side feeding machine is connected with the adjusted support, the side feeding machine can be well connected with the main machine cylinder, and therefore the problem that the side feeding machine cannot be quickly connected with the main machine cylinder due to the fact that the ground is uneven is solved.

Optionally, adjustment mechanism is including being used for the rigid coupling to be in cone on the bottom plate, the setting of sliding are in three slider on the cone and with the mount pad that the slider ball is articulated to link to each other, the mount pad with be provided with between the slider and be used for the fastener with the two locking, the interval is provided with three slide rails on the lateral wall of cone, three the length direction of slide rail with the length direction of the generating line of cone is unanimous mutually, the slider with slide rail slip adaptation, the slider with be provided with between the slide rail and be used for the locating part with the two locking.

Through adopting above-mentioned technical scheme, when the relative angle on bottom plate and ground need be adjusted, earlier through the fastener with mount pad and slider locking for the mount pad locking under with ground vertically state. And then the three mounting seats are respectively moved to enable the sliding block to slide along the sliding rail, the supporting points of the mounting seats on the bottom plate are changed, and the relative angle between the bottom plate and the ground is changed. When the bottom plate is in a horizontal state, the mounting base stops moving, the sliding block and the sliding rail are locked through the limiting part, and the bottom plate is adjusted. The cone can be as the leading surface that the slider is close to/keeps away from the bottom plate center, and mount pad, slider and slide rail all set up to three, make the mount pad comparatively stable to the support of bottom plate, and it is also comparatively convenient during the adjustment, and the locating part makes the bottom plate can comparatively stable keep the horizontality.

Optionally, the adjusting mechanism further includes a pulley rotatably disposed at one end of the mounting seat far away from the sliding block, and the pulley is in sliding abutment with the ground.

Through adopting above-mentioned technical scheme, the setting of pulley makes the regulation of mount pad more convenient, simultaneously, makes the removal of support more convenient.

Optionally, the end face of the bottom plate, which is far away from one side of the cone, is provided with three bubble levels, and the three bubble levels are distributed around the central axis of the cone.

Through adopting above-mentioned technical scheme, the setting of bubble spirit level can more conveniently judge whether the bottom plate has reached the horizontality, sets up the bubble spirit level into threely, can reflect the horizontality of bottom plate simultaneously from a plurality of directions, makes the regulation more accurate.

Optionally, a plurality of jacks are formed in the slide rail, the jacks are arranged at intervals along the length direction of the slide rail, a limiting hole is formed in the slide block, and the limiting part is a limiting rod which penetrates through the limiting hole and is movably inserted into the jacks.

Through adopting above-mentioned technical scheme, when needs are with slider and slide rail locking, slide earlier the slider and make the bottom plate be in the horizontality, jack and spacing hole align this moment, pass spacing hole and plug in the jack with the gag lever post again, realize the quick locking of slider and slide rail.

Optionally, the locking piece is set to be a fixed rod, a through hole is formed in the side wall of the sleeve in a penetrating mode, a plurality of fixed holes are formed in the outer side wall of the lifting column and are arranged at intervals along the length direction of the lifting column, and the fixed rod penetrates through the through hole and is matched with the fixed holes in an inserting mode.

Through adopting above-mentioned technical scheme, when the lift post was adjusted to required position, align through-hole and fixed orifices, pass the through-hole with the dead lever again and insert and connect in the fixed orifices, realize lift post and telescopic quick locking.

Optionally, a guide strip is arranged on the inner side wall of the sleeve, the length direction of the guide strip is consistent with that of the sleeve, a guide groove is formed in the outer side wall of the lifting column, and the guide strip is in sliding fit with the guide groove.

Through adopting above-mentioned technical scheme, when adjusting the lift post and being close to/keeping away from the bottom plate, the gib block slides in the guide way, makes the lift post can only follow the length direction motion of lift post and difficult relative sleeve rotation to make the line of a plurality of screw holes align with the through-hole all the time, conveniently align through-hole and screw hole fast, realize the quick locking to lift post and telescopic.

Optionally, one side of the slider close to the mounting seat is fixedly connected with an external thread cylinder, the mounting seat is close to one end of the slider is fixedly connected with a hinge ball, the hinge ball is rotatably embedded in the external thread cylinder, one end of the external thread cylinder, which is far away from the slider, is provided with a notch, the fastener is arranged in a threaded sleeve mode and is arranged on a control cylinder on the external thread cylinder, and when the control cylinder moves in the direction far away from the slider, the external thread cylinder is far away from the caliber of one end of the slider and shrinks.

Through adopting above-mentioned technical scheme, after through the gag lever post with slider and slide rail locking, rotate the control section of thick bamboo again, the direction motion of keeping away from the slider is faced to the control section of thick bamboo, makes the bore shrink of slider one end is kept away from to the external screw thread section of thick bamboo for the bore of external screw thread section of thick bamboo is tightened up, and the stable cladding of external screw thread section of thick bamboo makes the difficult relative external screw thread section of thick bamboo rotation of articulated ball this moment, realizes the quick locking between mount pad and the slider.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the adjusting mechanism for adjusting the relative angle between the bottom plate and the ground is arranged on the bottom plate, the distance between the lifting column and the bottom plate is adjustable, the bottom plate is adjusted to be in a horizontal state through the adjusting mechanism, the height of the supporting plate is adjusted through the lifting column, and the side feeder is connected with the support after the adjustment is finished, so that the side feeder can be quickly aligned with the main machine cylinder, and the problem that the side feeder cannot be quickly connected with the main machine cylinder due to the fact that the ground is uneven is solved;

2. the mounting seat is hinged with the sliding block ball, so that after the position of the sliding block is adjusted, the mounting seat can be rotated to be perpendicular to the ground, and further, when the mounting seat supports the side feeder, the horizontal shear stress on the mounting seat is reduced as much as possible, and the service life of the mounting seat is prolonged;

3. three bubble gradienters are arranged on the bottom plate, so that the horizontal state of the bottom plate can be reflected from multiple directions simultaneously, and the adjustment is more accurate.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a schematic structural view of an adjustment mechanism in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a pulley, a mounting seat and a sliding block in the embodiment of the application;

fig. 4 is a schematic diagram of an exploded structure of a lifting column and a sleeve in an embodiment of the present application.

Reference numerals: 1. a side feeder; 2. a support; 3. a support plate; 4. a lifting column; 5. a sleeve; 6. a base plate; 7. a mounting seat; 8. a cone; 9. a slider; 10. a pulley; 11. a bubble level; 12. a slide rail; 14. a limiting rod; 15. a limiting hole; 16. a jack; 17. fixing the rod; 18. a through hole; 19. a fixing hole; 20. a guide bar; 21. a guide groove; 22. an externally threaded barrel; 23. hinging the ball; 24. opening; 25. a control cylinder; 26. a motor; 27. a speed reducer; 28. a transmission distribution box; 29. a hopper; 30. a feeding cylinder.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

Referring to fig. 1, the side feeder 1 includes a motor 26, a speed reducer 27, a transmission distribution box 28, a hopper 29 and a feeding barrel 30, a screw assembly for feeding is arranged in the feeding barrel 30, when auxiliary feeding into the main barrel is required, an opening end of the feeding barrel 30 is firstly connected to a feed inlet of the main barrel, then the motor 26 is started, feeding is carried out into the feeding barrel 30 through the hopper 29, the screw assembly continuously rotates and feeds in the feeding barrel 30 under the driving of the motor 26, and auxiliary feeding of the side feeder 1 to the main barrel is realized.

The embodiment of the application discloses a feeding device for a PE pipe extruder. Referring to fig. 1, the feeding device for the PE pipe extruder comprises a side feeder 1 and a support 2, wherein the support 2 comprises a support plate 3, a lifting column 4, a sleeve 5 and a bottom plate 6, the end surface of one side of the support plate 3 is fixedly connected with a transmission distribution box 28, and the other side of the support plate is welded with the lifting column 4. The sleeve 5 is slidingly sleeved at one end, far away from the supporting plate 3, of the lifting column 4, one end, far away from the lifting column 4, of the sleeve 5 is welded with the bottom plate 6, and a locking piece used for locking the sleeve 5 and the lifting column 4 is arranged on the sleeve 5. The bottom plate 6 is provided with an adjusting mechanism for adjusting the relative angle of the bottom plate 6 and the ground.

When the side feeding machine 1 is required to be connected with the main machine barrel, the relative angle between the bottom plate 6 and the ground is adjusted through the adjusting mechanism, so that the bottom plate 6 is horizontal, the lifting column 4 is close to/far away from the bottom plate 6, the supporting plate 3 reaches the required height, and the lifting column 4 and the sleeve 5 are locked through the locking piece, so that the support 2 is adjusted. At this moment, the side feeding machine 1 is connected with the adjusted support 2, and the side feeding machine 1 can be quickly aligned with the main machine cylinder body, so that the problem that the side feeding machine 1 and the main machine cylinder body cannot be quickly connected due to uneven ground is solved.

Referring to fig. 2, the adjusting mechanism includes a cone 8 fixedly connected to the bottom plate 6, three sliding blocks 9 slidably disposed on the cone 8, a mounting base 7 connected to the sliding blocks 9 in a ball-and-socket manner, and a pulley 10 rotatably connected to an end of the mounting base 7 far from the sliding blocks 9. The bottom surface of the cone 8 is connected with the end surface of the bottom plate 6 far away from the sleeve 5 by welding. Three slide rails 12 are riveted on the side wall of the cone 8 at intervals, the three slide rails 12 are uniformly distributed on the side wall of the cone 8, the length directions of the three slide rails 12 are consistent with the length direction of a bus of the cone 8, and the three slide blocks 9 are respectively connected on the three slide rails 12 in a sliding manner.

Referring to fig. 2, a plurality of insertion holes 16 are formed in the slide rail 12, and the insertion holes 16 are spaced apart from each other along the length direction of the slide rail 12. A limiting hole 15 is correspondingly formed in the sliding block 9 in a penetrating mode, and a limiting part used for locking the sliding block 9 and the sliding rail 12 is arranged between the sliding block 9 and the sliding rail. The limiting part is a limiting rod 14 which penetrates through the limiting hole 15 and is movably inserted into the jack 16, and the limiting rod 14 is in interference fit with the jack 16.

After the locking and positioning of the sliding block 9 are completed, if the mounting base 7 is not perpendicular to the ground, the mounting base 7 is subjected to shear stress in the horizontal direction when bearing the side feeder 1, and then the mounting base 7 is easily damaged. Therefore, referring to fig. 2 and 3, an external thread cylinder 22 is fixedly connected to one side of the slider 9 close to the mounting seat 7, a spherical shell type groove is formed in the external thread cylinder 22, the external thread cylinder 22 is made of spring steel, a damping pad is bonded to the inner wall of the groove of the external thread cylinder 22, and a notch 24 is formed in one end, far away from the slider 9, of the external thread cylinder 22. One end of the mounting seat 7 close to the sliding block 9 is fixedly connected with a hinge ball 23, and the diameter size of the hinge ball 23 is larger than that of the section circle of the mounting seat 7. The hinge ball 23 is rotatably embedded in a groove in the external thread cylinder 22, and the hinge ball 23 is tightly abutted with the damping pad.

Referring to fig. 2 and 3, a fastening piece for quickly locking the mounting base 7 and the sliding block 9 is arranged on the external thread cylinder 22, and in the embodiment of the present application, the fastening piece is arranged to be sleeved on a control cylinder 25 on the external thread cylinder 22; after the mounting seat 7 is rotated to be perpendicular to the ground, the control cylinder 25 is rotated, the control cylinder 25 moves towards the direction away from the sliding block 9 under the driving of the threads of the external thread cylinder 22, at the moment, the caliber of one end, away from the sliding block 9, of the external thread cylinder 22 contracts under the extrusion of the inner wall of the control cylinder 25, so that the damping pad is tightly wrapped on the periphery of the hinge ball 23, the hinge ball 23 is limited to rotate in the external thread cylinder 22, and the mounting seat 7 is vertically and stably erected on the ground through the pulley 10.

In other embodiments, the fastening element is a locking screw threaded through the sidewall of the external thread cylinder 22, and the hinge ball 23 has a plurality of locking holes uniformly formed on the peripheral wall thereof for inserting the locking screw. When the hinge ball 23 needs to be limited to rotate in the groove of the external thread cylinder 22, only the locking screw needs to be rotated, so that the locking screw is inserted into the locking hole, and the locking fixation of the hinge ball 23 can be completed.

In order to achieve rapid leveling of the bottom plate 6, referring to fig. 1 and 2, three bubble levels 11 are fixedly connected to an end surface of the bottom plate 6 on a side away from the cone 8, and the three bubble levels 11 are distributed around a central axis of the cone 8. In the embodiment of the present application, the length direction of the bubble level 11 is perpendicular to the projection of the slide rail 12 on the bottom plate 6.

When the levelness of the bottom plate 6 needs to be adjusted, the mounting seat 7 is firstly rotated, the mounting seat 7 is perpendicular to the ground, then the control barrel 25 is rotated, the control barrel 25 moves towards the direction far away from the sliding rail 12, and the mounting seat 7 and the sliding block 9 are locked and fixed by the control barrel 25. Then, the three mounting seats 7 are respectively moved, and the pulley 10 slides on the ground, so that the sliding block 9 slides along the sliding rail 12; when the air bubbles in the three air bubble levels 11 are all in the middle position, the installation seat 7 stops moving at the moment; finally, the sliding block 9 and the sliding rail 12 are locked by the limiting rod 14, and the bottom plate 6 is stably and horizontally erected on the ground.

After the bottom plate 6 is leveled, the height of the side feeder 1 needs to be adjusted, referring to fig. 1 and 4, through holes 18 are formed through the side wall of the sleeve 5, in order to achieve stable erection of the side feeder 1, in the embodiment of the present application, two through holes 18 are provided, and in other embodiments, one, three, or four through holes 18 may be provided. In the present embodiment, two through holes 18 are distributed in the radial direction of the sleeve 5. Two sets of fixed orificess 19 have been seted up on the lateral wall of lift post 4 correspondingly, and two sets of fixed orificess 19 and two through-holes 18 one-to-one, every fixed orificess 19 of group are provided with a plurality ofly, and a plurality of fixed orificess 19 are established along the length direction interval of lift post 4. The locking piece is set as a fixed rod 17, and the fixed rod 17 penetrates through a through hole 18 to be movably inserted in a fixed hole 19.

In order to realize the quick locking and fixing of the lifting column 4 in the sleeve 5, referring to fig. 1 and 4, a guide strip 20 is welded on the inner side wall of the sleeve 5, and the length direction of the guide strip 20 is consistent with the length direction of the sleeve 5. The guide groove 21 is formed in the outer side wall of the lifting column 4, one end, far away from the bottom plate 6, of the guide groove 21 is in a closed setting, one end, close to the bottom plate 6, of the guide groove 21 is in an open setting, and the guide strip 20 is in sliding fit with the guide groove 21.

When the position of lift post 4 is adjusted to needs, make lift post 4 earlier along the length direction motion of lift post 4, the gib block 20 slides in guide way 21 simultaneously, reaches required height back when backup pad 3, and through-hole 18 aligns with fixed orifices 19 this moment, wears to establish through-hole 18 with dead lever 17 and inserts and connect in the fixed orifices 19 that correspond again, can accomplish the quick locking of lift post 4 fixedly.

The implementation principle of the feeding device for the PE pipe extruder in the embodiment of the application is as follows: when the ground for placing the side feeder 1 and the ground for placing the main machine barrel are uneven, the mounting seat 7 is rotated to enable the mounting seat 7 to be perpendicular to the ground, and the mounting seat 7 and the sliding block 9 are locked by using the control cylinder 25. Then, the mounting base 7 is moved to enable the sliding block 9 to slide along the sliding rail 12, the supporting point of the mounting base 7 on the bottom plate 6 is changed, and the relative angle between the bottom plate 6 and the ground is changed. When the air bubbles in the three bubble levels 11 are all in the middle position, the bottom plate 6 is in the horizontal state, and at the moment, the sliding block 9 and the sliding rail 12 are locked through the limiting rod 14, so that the leveling of the bottom plate 6 can be completed.

Then, the lifting column 4 is moved along the length direction of the sleeve 5, and after the side feeder 1 reaches the required height, the lifting column 4 is locked with the sleeve 5 through the fixing rod 17. At this time, the opening end of the feeding cylinder 30 is aligned with the feeding port of the main body cylinder, and the feeding cylinder 30 is connected with the main body cylinder, so that the motor 26 can be started to feed materials into the hopper 29, and the screw rod assembly starts to feed materials into the main body cylinder.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a throw material device for PE pipe extruder, includes side feeder (1) and support (2), its characterized in that: support (2) include backup pad (3), lift post (4), sleeve (5) and bottom plate (6), the terminal surface of backup pad (3) one side with side feeding machine (1) is connected, the opposite side with lift post (4) fixed connection, sleeve (5) slip cover is established lift post (4) is kept away from the one end of backup pad (3), sleeve (5) are kept away from the one end of lift post (4) with bottom plate (6) fixed connection, be provided with on sleeve (5) be used for with sleeve (5) with the locking piece of lift post (4) locking, be provided with on bottom plate (6) and be used for adjusting bottom plate (6) and ground relative angle's adjustment mechanism.

2. The feeding device for a PE pipe extruder as set forth in claim 1, characterized in that: adjustment mechanism is including being used for the rigid coupling cone (8), the setting of sliding on bottom plate (6) are in three slider (9) on cone (8) and with slider (9) ball joint link to each other mount pad (7), mount pad (7) with be provided with between slider (9) and be used for the fastener with the two locking, the interval is provided with three slide rails (12), three on the lateral wall of cone (8) the length direction of slide rail (12) with the length direction of the generating line of cone (8) is unanimous mutually, slider (9) with slide rail (12) slip adaptation, slider (9) with be provided with between slide rail (12) and be used for the locating part with the two locking.

3. The feeding device for a PE pipe extruder as set forth in claim 2, characterized in that: the adjusting mechanism further comprises a pulley (10) which is rotatably arranged at one end, far away from the sliding block (9), of the mounting seat (7), and the pulley (10) is in sliding butt joint with the ground.

4. The feeding device for a PE pipe extruder as set forth in claim 2, characterized in that: the bottom plate (6) is kept away from be provided with three bubble spirit levels (11) on the terminal surface of cone (8) one side, three bubble spirit levels (11) are followed the axis of cone (8) encircles the distribution.

5. The feeding device for PE pipe extruder according to claim 2, characterized in that: the slide rail (12) is provided with a plurality of jacks (16), the jacks (16) are arranged at intervals along the length direction of the slide rail (12), the slide block (9) is provided with a limiting hole (15), and the limiting part is a limiting rod (14) which penetrates through the limiting hole (15) and is movably inserted into the jacks (16).

6. The feeding device for a PE pipe extruder as set forth in claim 1, characterized in that: the locking piece sets up to dead lever (17), through-hole (18) have been seted up in running through on the lateral wall of sleeve (5), a plurality of fixed orificess (19) have been seted up on the lateral wall of lift post (4), and is a plurality of fixed orificess (19) are followed the length direction interval of lift post (4) sets up, dead lever (17) are worn to establish through-hole (18) with the adaptation of pegging graft of fixed orificess (19).

7. The feeding device for a PE pipe extruder as set forth in claim 6, characterized in that: be provided with gib block (20) on the inside wall of sleeve (5), the length direction of gib block (20) with the length direction of sleeve (5) is unanimous, guide way (21) have been seted up on the lateral wall of lift post (4), gib block (20) with guide way (21) sliding fit.

8. The feeding device for a PE pipe extruder as set forth in claim 2, characterized in that: slider (9) are close to one side fixedly connected with external screw thread section of thick bamboo (22) of mount pad (7), mount pad (7) are close to the one end fixedly connected with hinge ball (23) of slider (9), hinge ball (23) are rotated and are inlayed and are established in external screw thread section of thick bamboo (22), external screw thread section of thick bamboo (22) are kept away from opening (24) have been seted up to the one end of slider (9), the fastener sets up to the threaded sleeve and establishes control section of thick bamboo (25) on external screw thread section of thick bamboo (22), work as control section of thick bamboo (25) are towards keeping away from during the direction motion of slider (9), external screw thread section of thick bamboo (22) are kept away from the bore shrink of slider (9) one end.

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