CN213795004U - Screen welding tool - Google Patents

Abstract

The utility model belongs to the technical field of welding tools, and discloses a screen welding tool, which comprises a base, a first positioning mechanism, a second positioning mechanism and a pressing mechanism, wherein the first positioning mechanism is fixedly connected with the base, the first positioning mechanism is configured to fix a pair of frames, the second positioning mechanism is fixedly connected with the base, the second positioning mechanism comprises a first positioning plate and a second positioning plate, the first positioning plate and the second positioning plate are respectively provided with a first clamping groove and a second clamping groove which can be used for placing a net strip, the first positioning plate and the second positioning plate can move in a staggered way, so that the first clamping groove and the second clamping groove can be matched with the clamping of the net strip, the pressing mechanism is fixedly connected with the base, the pressing mechanism is configured to press the net strip against the second positioning plate, so as to realize the positioning, pressing and fixing of the net strip which is connected between the frames and arranged along the transverse direction or the longitudinal direction, the size between the holes of the screen after welding is ensured.

Description

Screen welding tool

Technical Field

The utility model relates to a welding frock technical field especially relates to a screen cloth welding frock.

Background

The screen is a functional structural member on a threshing and cleaning structure of an agricultural harvester product, and the screen and the threshing roller are required to have uniform clearance and good consistency; and the hole spacing size on the screen is required to be consistent and uniform, and the screen is well matched with other structural members in assembly. When the axial-flow threshing device is used, the fixed screen mesh is matched with the rotary threshing cylinder to separate and screen axial-flow crop straws and fruits.

The existing screen welding tool is simple in structure, manual operation is adopted, the labor intensity of workers is high, the welding deformation of the processed screen is large, the size is not easy to guarantee, the shaping difficulty is high, and the production efficiency is low.

In addition, current screen cloth welding frock is only applicable to the frame to the screen cloth and fixes a position, compress tightly and fixed, can not fix a position, compress tightly and fix connecting between the frame and along the horizontal or vertical netting twine that sets up, can't guarantee the size between the hole of the screen cloth after the welding is accomplished.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a screen cloth welding frock to the realization is to connecting between the frame and along horizontal or vertical location of setting the net strip, compress tightly and fixed, guarantees to weld the hole size of the screen cloth after accomplishing.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a screen cloth welding frock, the screen cloth includes a pair of frame that transversely sets up and connects in a pair of between the frame and along the net strip of vertical setting, screen cloth welding frock includes:

a base;

a first positioning mechanism fixedly connected to the base, the first positioning mechanism configured to fix a pair of the frames;

the second positioning mechanism is fixedly connected to the base and comprises a first positioning plate and a second positioning plate, the first positioning plate and the second positioning plate are respectively provided with a first clamping groove and a second clamping groove, the first clamping groove and the second clamping groove can be used for placing the net strips, and the first positioning plate and the second positioning plate can move in a staggered mode so that the first clamping groove and the second clamping groove can be matched with each other to clamp the net strips; and

and the pressing mechanism is fixedly connected to the base and is configured to press the net strip against the second positioning plate.

Preferably, at least one of the first card slot and the second card slot has a slot width greater than a width of the web.

Preferably, the second positioning mechanism further comprises a first driving member configured to drive the first positioning plate to move so as to align or interleave the first card slot and the second card slot.

Preferably, the second positioning plate is fixedly connected to the base, and one end of the first positioning plate is fixedly connected to the output end of the first driving member;

the first positioning plate and the second positioning plate are connected through a first bolt and a nut, a strip-shaped hole extending along the moving direction of the first positioning plate is formed in the first positioning plate, and the bolt penetrates through the strip-shaped hole and the second positioning plate and can move along the moving direction of the first positioning plate in the strip-shaped hole.

Preferably, the base comprises a first side plate and a second side plate which are parallel to each other;

the first positioning mechanism comprises:

two support plates fixedly connected between the first side plate and the second side plate, the two support plates being respectively configured to support a pair of the bezels; and

the third positioning plate is parallel to the first side plate and fixedly connected with the first side plate, and the distance between the third positioning plate and the second side plate is equal to the length of the frame so as to clamp the frame.

Preferably, the third positioning plate is connected to the first side plate through a second bolt, the third positioning plate is screwed to a tail portion of the second bolt, and a position where the first side plate is screwed to the second bolt is adjusted to move the third positioning plate in an extending direction of the support plate.

Preferably, the pressing mechanism includes:

the more than two first compression plates are parallel to the net strips, and at least two first compression plates are configured to respectively press the net strips positioned at two ends of the screen;

a plurality of second compression plates which are parallel to each other are arranged between every two adjacent first compression plates, and the lower surfaces of the second compression plates are abutted to the upper surfaces of the net strips so as to press the screen.

Preferably, the screen welding tool further comprises a reverse deformation driving mechanism fixedly connected to the base, and an output end of the reverse deformation driving mechanism penetrates through the supporting plate and abuts against the frame.

Preferably, a round bar is connected between the first side plate and the second side plate, and the surface of the round bar is abutted to the lower surface of the net strip to support the net strip.

Preferably, the first driving member is an air cylinder, a hydraulic cylinder or a lead screw nut mechanism.

The utility model has the advantages that:

the utility model provides a screen cloth welding frock has first locating plate and the second locating plate of first draw-in groove and second draw-in groove respectively through the setting, adjust the relative position of first locating plate and second locating plate, make the cell wall that first draw-in groove and second draw-in groove are relative can mutually support, the holding netting twine jointly, every netting twine homoenergetic is by axial positioning, press from both sides tightly and fixed, because the net axle is installed on the netting twine, consequently every net axle also is fixed a position, press from both sides tightly and fixed, prevent that the netting twine from taking place the skew among the welding process, guarantee the interpore size of the screen cloth after the welding is accomplished. Simultaneously, first positioning mechanism can realize the fixed to the whole frame of screen cloth, prevents that the screen cloth from removing in the horizontal plane, and hold-down mechanism can prevent that the screen cloth from removing in vertical direction.

Drawings

FIG. 1 is an assembly view of the screen and screen welding tool of the present invention;

FIG. 2 is a schematic structural view of the screen welding tool of the present invention;

FIG. 3 is a top view of the screen welding tool of the present invention;

fig. 4 is a side view of the utility model discloses screen welding frock.

In the figure:

100. a base; 110. a first side plate; 120. a second side plate; 111. a guide groove;

200. a first positioning mechanism; 210. a support plate; 220. a third positioning plate; 230. a second bolt;

300. a second positioning mechanism; 310. a first positioning plate; 320. a first driving member; 330. a second positioning plate; 340. a first bolt; 350. a nut; 311. a first card slot; 312. a strip-shaped hole; 331. a second card slot;

400. a hold-down mechanism; 410. a first compression plate; 420. a first support base; 430. a pressure head; 440. a second support seat; 450. a second compression plate; 460. a second driving member; 470. a guide plate;

500. a reversible deformation driving mechanism;

600. a round bar;

700. a mesh strip;

800. and (5) a frame.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

A conventional screen for a combine harvester generally includes a pair of frames 800 arranged in a transverse direction, and a plurality of net strips 700 connected between the frames 800 and arranged in a longitudinal direction, wherein a part of the net strips 700 are clamped with the frames 800 to determine a longitudinal width of the screen, each net strip 700 is provided with axle holes arranged at equal intervals, and when the net strips 700 are connected between the frames 800, the axle holes on the net strips 700 are arranged in a straight line in the transverse direction to pass through the axle holes in the transverse direction to mount a net axle, and the net strips 700 arranged in the longitudinal direction and the net axle arranged in the transverse direction are combined to form a net structure of the screen. After the mesh strips 700, the mesh shaft and the frame 800 are combined together to form the screen, the screen needs to be welded in order to ensure that the strength and stability of the screen meet the use requirements.

For this purpose, the present embodiment provides a screen welding tool, as shown in fig. 1 to 3, the screen welding tool includes a base 100, a first positioning mechanism 200, a second positioning mechanism 300, and a pressing mechanism 400, the first positioning mechanism 200 is fixedly connected to the base 100, the first positioning mechanism 200 is configured to fix a pair of frames 800, the second positioning mechanism 300 is fixedly connected to the base 100, the second positioning mechanism 300 includes a first positioning plate 310 and a second positioning plate 330, the first positioning plate 310 and the second positioning plate 330 are respectively provided with a first clamping slot 311 and a second clamping slot 331 capable of placing a net strip 700, the first positioning plate 310 and the second positioning plate 330 are capable of moving in a staggered manner, so that the first clamping slot 311 and the second clamping slot 331 can cooperate to clamp the net strip 700, the pressing mechanism 400 is fixedly connected to the base 100, and the pressing mechanism 400 is configured to press the net strip 700 against the second positioning plate 330.

For prior art, the screen cloth welding frock that this embodiment provided is through setting up first locating plate 310 and the second locating plate 330 that has first draw-in groove 311 and second draw-in groove 331 respectively, adjust the relative position of first locating plate 310 and second locating plate 330, make the relative cell wall of first draw-in groove 311 and second draw-in groove 331 can mutually support, hold the fillet 700 jointly, every fillet 700 homoenergetic is by axial positioning, press from both sides tightly and fix, because the net axle is installed on fillet 700, therefore every axis also is fixed a position, press from both sides tightly and fixed, prevent that the fillet 700 from taking place the skew among the welding process, guarantee the interpore size of the screen cloth after the welding is accomplished. Meanwhile, the first positioning mechanism 200 can fix the whole outer frame of the screen, so that the screen is prevented from moving in the horizontal plane, and the pressing mechanism 400 can prevent the screen from moving in the vertical direction.

In order to facilitate the mesh strip 700 to be placed in the first card slot 311 and the second card slot 331 and the first positioning plate 310 and the second positioning plate 330 can move in a staggered manner, the width of at least one of the first card slot 311 and the second card slot 331 is greater than the width of the mesh strip 700, in this embodiment, the widths of the first card slot 311 and the second card slot 331 are preferably greater than the width of the mesh strip 700, in addition, a plurality of second positioning mechanisms 300 are arranged, and each mesh strip 700 is arranged in the plurality of first card slots 311 and the second card slot 331 in the longitudinal direction in a penetrating manner, so as to position, clamp and fix a plurality of positions of the mesh strip 700.

In order to enable the first positioning plate 310 and the second positioning plate 330 to move alternately, the first positioning plate 310 may be fixedly connected to the base 100, and the second positioning plate 330 moves relative to the first positioning plate 310, or the second positioning plate 330 may be fixedly connected to the base 100, and the first positioning plate 310 moves relative to the second positioning plate 330, or the first positioning plate 310 and the second positioning plate 330 move together in opposite directions.

Preferably, in the present embodiment, the second positioning plate 330 is fixed, and the first positioning plate 310 moves relative to the second positioning plate 330. In order to move the first positioning plate 310, in this embodiment, the second positioning mechanism 300 further includes a first driving member 320, that is, the second positioning plate 330 is fixedly connected to the base 100, one end of the first positioning plate 310 is fixedly connected to the output end of the first driving member 320, the first driving member 320 is configured to drive the first positioning plate 310 to move, so that the first engaging groove 311 and the second engaging groove 331 are aligned or staggered, and thus the first positioning plate 310 and the second positioning plate 330 have two working positions for placing and clamping the screen, when the first engaging groove 311 and the second engaging groove 331 are aligned, the mesh bar 700 can be placed into the first engaging groove 311 and the second engaging groove 331, and then the mesh shaft is installed in the axial hole on the mesh bar 700, the first driving member 320 drives the first positioning plate 310 to move relative to the second positioning plate 330, so that the first engaging groove 311 and the second engaging groove 331 are staggered, and the opposite groove walls of the first engaging groove 311 and the second engaging groove 331 can be matched with each other, the mesh strip 700 is positioned, clamped and fixed, and after welding, the first driving member 320 drives the first positioning plate 310 to move relative to the second positioning plate 330, so that the first clamping groove 311 and the second clamping groove 331 are aligned, and the welded mesh can be taken out.

Optionally, in this embodiment, the base 100 includes a first side plate 110 and a second side plate 120 that are parallel to each other, the second positioning plate 330 is fixedly connected between the first side plate 110 and the second side plate 120, the first side plate 110 is provided with a guide slot 111, and one end of the first positioning plate 310 close to the first side plate 110 passes through the guide slot 111 and is fixedly connected to the output end of the first driving member 320. The groove walls of the first or second locking groove 311, 331 adjacent to the first and second side plates 110, 120 can cooperate with the first and second side plates 110, 120 to locate, clamp and secure the mesh strip 700 at both ends of the screen.

In order to limit the moving distance of the first positioning plate 310, the first positioning plate 310 and the second positioning plate 330 are preferably connected by a first bolt 340 and a nut 350, the first positioning plate 310 is provided with a strip-shaped hole 312 extending along the moving direction of the first positioning plate 310, and the bolt passes through the strip-shaped hole 312 and the second positioning plate 330 and can move in the strip-shaped hole 312 along the moving direction of the first positioning plate 310. The first positioning plate 310 and the second positioning plate 330 are movably connected by bolts, and the moving distance of the first positioning plate 310 is limited by limiting the moving distance of the bolts in the strip-shaped holes 312.

The first driving member 320 may be an air cylinder, a hydraulic cylinder, or a lead screw nut mechanism, and is not particularly limited.

As shown in fig. 2 to 4, in the present embodiment, the base 100 includes a first side plate 110 and a second side plate 120 that are parallel to each other, the first positioning mechanism 200 includes two supporting plates 210 and a third positioning plate 220, the two supporting plates 210 are fixedly connected between the first side plate 110 and the second side plate 120, the two supporting plates 210 are respectively configured to support a pair of frames 800, the third positioning plate 220 is parallel to the first side plate 110 and is fixedly connected to the first side plate 110, a distance between the third positioning plate 220 and the second side plate 120 is equal to a length of the frames 800 to clamp the frames 800, and the third positioning plate 220, the supporting plates 210 and the second side plate 120 cooperate with each other to limit movement of the frames 800, thereby defining an overall profile of the screen.

Since the size of the screen is not fixed, in order to adapt to the size of the screen varying along the extending direction of the support plate 210, in the embodiment, the third positioning plate 220 is preferably connected to the first side plate 110 through the second bolt 230, the third positioning plate 220 is screwed to the tail of the second bolt 230, and the position of the first side plate 110 screwed to the second bolt 230 is adjusted to move the third positioning plate 220 along the extending direction of the support plate 210. When the size of the screen along the extending direction of the supporting plate 210 is large, the distance between the first side plate 110 and the third positioning plate 220 is reduced by controlling the position of the first side plate 110 screwed to the second bolt 230 close to the tail part, and because the positions of the first side plate 110 and the second side plate 120 are fixed, the second bolt 230 moves away from the second side plate 120, so that the third positioning plate 220 moves away from the second side plate 120 to adapt to the screen with a large size; when the size of the screen along the extending direction of the supporting plate 210 is smaller, the distance between the first side plate 110 and the third positioning plate 220 is increased by controlling the position of the first side plate 110 screwed to the head of the second bolt 230, and since the positions of the first side plate 110 and the second side plate 120 are fixed, the second bolt 230 moves towards the second side plate 120, and the third positioning plate 220 moves towards the second side plate 120, so as to adapt to the smaller size of the screen.

In this embodiment, the lower surface of the mesh strip 700 abuts against the groove wall of the second clamping groove 331, in order to better fit the mesh screen with the groove wall of the second clamping groove 331, and the mesh screen welding tool provided in this embodiment further includes a pressing mechanism 400, the pressing mechanism 400 includes more than two first pressing plates 410, the first pressing plates 410 are parallel to the mesh strip 700, at least two first pressing plates 410 are configured to respectively abut against the mesh strip 700 located at two ends of the mesh screen, a plurality of second pressing plates 450 parallel to each other are disposed between two adjacent first pressing plates 410, and the lower surfaces of the second pressing plates 450 abut against the upper surface of the mesh strip 700 to abut against the mesh screen.

Referring to fig. 1 to 2, one end of the first pressing plate 410 is hinged to a first supporting base 420 fixed to the base 100, and the other end of the first pressing plate 410 is a movable end and fixed by a pressing structure such that the pressing plate can rotate with respect to the hinge point, thereby opening or pressing down the first pressing plate 410.

The pressing structure includes a pressing head 430 and a guiding member, the pressing head 430 is configured to press the movable end of the first pressing plate 410, so that the lower surface of the first pressing plate 410 is engaged with the upper surface of the mesh strip 700 at the two ends of the screen, and the guiding member provides a guiding function for the downward movement of the movable end of the first pressing plate 410, so as to prevent the first pressing plate 410 from deviating from the correct position, and facilitate pressing and fixing. Specifically, the pressing head 430 is hinged to a second supporting seat 440 fixed to the base 100, the guiding member includes two guiding plates 470 parallel to the first side plate 110, the movable end of the first pressing plate 410 extends downward into the middle of the two guiding plates 470, and the pressing head 430 presses downward to fix the first pressing plate 410.

A plurality of second pressing plates 450 parallel to each other are arranged between two adjacent first pressing plates 410, and the lower surfaces of the second pressing plates 450 abut against the upper surfaces of the net strips 700 to press the net strips 700. The first pressing plate 410 is arranged along the longitudinal direction, the second pressing plate 450 is arranged along the transverse direction, when the first pressing plate 410 is pressed and fixed by the pressing head 430, the lower surface of the second pressing plate 450 is attached to the upper surface of the net strip 700, so that the net strip 700 inside the screen is pressed, and the first pressing plate 410 and the second pressing plate 450 are matched to press the whole screen tightly, so that welding is facilitated.

Based on the above, in this embodiment, the end portion of the first pressing plate 410 close to the first supporting seat 420 and the end portion of the pressing head 430 close to the second supporting seat 440 are respectively connected with a second driving member 460, the second driving member 460 may be one of an air cylinder, a hydraulic cylinder, or a screw-nut mechanism, and the second driving member 460 controls the first pressing plate 410 and the pressing head 430 to rotate, so as to realize automatic clamping and fixing of the screen mesh.

It is understood that the screen is a curved screen in this embodiment, i.e. the mesh strip 700 is an arc, but of course, in other embodiments, the screen may be a flat screen. When the screen is pressed downwards, the second positioning plate 330 supports the screen, and in order to better support the screen, a round bar 600 is connected between the first side plate 110 and the second side plate 120 in the embodiment, and the surface of the round bar 600 abuts against the lower surface of the net strip 700 to support the net strip 700.

In the actual processing, the problems of overlong screen and deformation after welding often exist, and in order to solve the problem, the screen welding tool in the embodiment further includes a reverse deformation driving mechanism 500 fixedly connected to the base 100, and an output end of the reverse deformation driving mechanism 500 penetrates through the support plate 210 and abuts against the frame 800. The reverse deformation driving mechanism 500 may apply a force opposite to the deformation direction to the frame 800 to perform the reverse deformation action.

Optionally, in order to facilitate installation of the screen shaft, a hole coaxial with the screen shaft of the screen is formed in the end face of one side plate, so that the screen shaft is convenient to install.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a screen cloth welding frock, the screen cloth includes a pair of frame (800) of transversely setting and connects in a pair just along vertical fillet (700) that sets up between frame (800), its characterized in that, screen cloth welding frock includes:

a base (100);

a first positioning mechanism (200) fixedly connected to the base (100), the first positioning mechanism (200) being configured to fix a pair of the rims (800);

the second positioning mechanism (300) is fixedly connected to the base (100), the second positioning mechanism (300) comprises a first positioning plate (310) and a second positioning plate (330), the first positioning plate (310) and the second positioning plate (330) are respectively provided with a first clamping groove (311) and a second clamping groove (331) which can be used for placing the net strip (700), and the first positioning plate (310) and the second positioning plate (330) can move in a staggered manner, so that the first clamping groove (311) and the second clamping groove (331) can be matched with each other to clamp the net strip (700); and

a pressing mechanism (400) fixedly connected to the base (100), wherein the pressing mechanism (400) is configured to press the net strip (700) against the second positioning plate (330).

2. The screen welding tooling of claim 1, wherein a slot width of at least one of the first slot (311) and the second slot (331) is greater than a width of the mesh strip (700).

3. The screen welding tool of claim 1, wherein the second positioning mechanism (300) further comprises a first driving member (320), and the first driving member (320) is configured to drive the first positioning plate (310) to move so as to align or stagger the first clamping groove (311) and the second clamping groove (331).

4. The screen welding tool according to claim 3, wherein the second positioning plate (330) is fixedly connected to the base (100), and one end of the first positioning plate (310) is fixedly connected to the output end of the first driving member (320);

first locating plate (310) with second locating plate (330) are connected through first bolt (340) and nut (350), be provided with on first locating plate (310) and follow bar hole (312) that first locating plate (310) moving direction extends, first bolt (340) pass bar hole (312) with second locating plate (330), and can follow in bar hole (312) first locating plate (310) moving direction removes.

5. The screen welding tooling of claim 1, wherein the base (100) includes a first side plate (110) and a second side plate (120) that are parallel to each other;

the first positioning mechanism (200) comprises:

two support plates (210) fixedly connected between the first side plate (110) and the second side plate (120), the two support plates (210) being respectively configured to support a pair of the rims (800); and

the third positioning plate (220) is parallel to the first side plate (110), and is fixedly connected with the first side plate (110), and the distance between the third positioning plate (220) and the second side plate (120) is equal to the length of the frame (800) so as to clamp the frame (800).

6. The screen welding tool according to claim 5, wherein the base (100) further comprises a base, the third positioning plate (220) is connected with the first side plate (110) through a second bolt (230), the third positioning plate (220) is screwed on the tail portion of the second bolt (230), the first side plate (110) and the second side plate (120) are fixedly connected to the base, and the position of the first side plate (110) screwed on the second bolt (230) is adjusted to change the distance between the third positioning plate (220) and the second side plate (120).

7. The screen welding tooling of claim 1, wherein the hold-down mechanism (400) comprises:

more than two first compression plates (410) parallel to the net strips (700), at least two first compression plates (410) are configured to respectively press against the net strips (700) at two ends of the screen;

a plurality of second compression plates which are parallel to each other are arranged between every two adjacent first compression plates (410), and the lower surfaces of the second compression plates are abutted to the upper surfaces of the net strips (700) to press the screen.

8. The screen welding tooling of claim 5, further comprising an anti-deformation driving mechanism (500) fixedly connected to the base (100), wherein an output end of the anti-deformation driving mechanism (500) penetrates through the support plate (210) and abuts against the frame (800).

9. The screen welding tool of claim 5, wherein a round rod (600) is connected between the first side plate (110) and the second side plate (120), and the surface of the round rod (600) is abutted to the lower surface of the screen strip (700) to support the screen strip (700).

10. The screen welding tooling of claim 3, wherein the first drive member (320) is an air cylinder, a hydraulic cylinder, or a lead screw nut mechanism.

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