Traction device for hydrogen energy pipeline production

Abstract

The utility model discloses a traction device for hydrogen energy pipeline production, which comprises a support, a plurality of groups of pipeline traction mechanisms are respectively fixed at the top end of the support, the plurality of groups of pipeline traction mechanisms are distributed at the top end of the support at equal intervals, each pipeline traction mechanism comprises a horizontal driving box, the horizontal driving box is provided with two output ends, and the two output ends are connected with the horizontal driving box. The two output ends are each fixedly provided with a horizontal supporting seat, and the horizontal driving box is used for driving the two horizontal supporting seats to move close to each other or away from each other. A pipeline to be cut is stuffed between the two sets of traction rollers, the gap between the two sets of traction rollers is just matched with the pipeline, the grooves can improve friction force between the traction rollers and the pipeline, when the two sets of traction rollers rotate oppositely, synchronously and reversely, the pipeline can be stably dragged to move, and the pipeline cannot slip and incline; and positioning is more accurate during cutting, and the yield is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen energy pipeline production, in particular to a traction device for hydrogen energy pipeline production. Background Art

[0002] Hydrogen energy has the advantages of wide sources, high energy conversion rate, no pollution, zero emission, storability, and renewability. It is an important energy carrier for achieving sustainable energy supply and circulation. Pipeline hydrogen transportation is considered to be an effective way to achieve large-scale transportation and utilization of hydrogen.

[0003] When processing hydrogen energy pipelines, it is generally necessary to cut long sections of pipelines. During the cutting process, the pipelines need to be moved horizontally by a traction mechanism so as to be transported to the bottom of the cutting machine for cutting. In the prior art, conveyor belts are mainly used to transport the pipelines. During the transportation process, the pipelines are prone to slippage and tilting, resulting in errors during cutting. Utility Model Content

[0004] In order to solve the problems mentioned in the above background technology, the utility model provides a traction device for hydrogen pipeline production.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A traction device for hydrogen pipeline production comprises a bracket, the top of each bracket is respectively fixed with a pipeline traction mechanism, a plurality of pipeline traction mechanisms are provided, and the plurality of pipeline traction mechanisms are equidistantly distributed at the top of the bracket, the pipeline traction mechanism comprises a horizontal drive box, the horizontal drive box is provided with two output ends, a horizontal support seat is fixed on each of the two output ends, the horizontal drive box is used to drive the two horizontal support seats to move closer to or away from each other, a first mounting frame and a second mounting frame are respectively fixed on the top of the two horizontal support seats, a plurality of vertical rotating shafts are rotatably installed on the first mounting frame and the second mounting frame, a traction stick is detachably installed on the top of the vertical rotating shaft, and the number of traction sticks on the first mounting frame and the second mounting frame is the same and corresponds one to one.

[0007] Preferably, a horizontally arranged bidirectional threaded rod is rotatably installed inside the horizontal driving box, and threaded sleeves are threadedly installed on the outsides of opposite threads at both ends of the bidirectional threaded rod. The threaded sleeve is horizontally slidably installed in the interior of the horizontal driving box through a slide rail slider mechanism, and a connecting vertical rod is fixed to the top end of the threaded sleeve. The top end of the connecting vertical rod extends to the outside of the horizontal driving box through a reserved sliding opening, and the top ends of the two connecting vertical rods are respectively fixed to two horizontal support seats, and a first rotating motor is fixed to the outside of the horizontal driving box, and the output shaft of the first rotating motor is fixed to the bidirectional threaded rod.

[0008] Preferably, the adjacent vertical rotating shafts located on the same side are synchronously driven by synchronous wheels and synchronous belts.

[0009] Preferably, a second rotating motor is fixedly mounted on the second mounting frame, and a motor reducer is mounted in conjunction with the second rotating motor, and an output end of the motor reducer is fixed to the bottom end of one of the vertical rotating shafts.

[0010] Preferably, a first bevel gear is fixed to the bottom end of a vertical shaft on the first mounting frame and the second mounting frame which is farthest from the second rotating motor, and a synchronous horizontal shaft is also rotatably mounted on the first mounting frame and the second mounting frame, the two synchronous horizontal shafts are directly opposite to each other, and a second bevel gear is fixed to the ends of the two synchronous horizontal shafts which are far away from each other, the second bevel gear is meshed with the first bevel gear, and a first polygonal pin and a first polygonal sleeve are respectively fixed to the ends of the two synchronous horizontal shafts which are close to each other, and the first polygonal pin is movably inserted into the first polygonal sleeve.

[0011] Preferably, a second polygonal pin is fixed to the top of the vertical rotating shaft, the diameters at both ends of the traction stick are larger than the middle diameter, and a plurality of grooves are provided on the outside of the traction stick, and a second polygonal sleeve is fixed to the bottom end of the traction stick, and the second polygonal sleeve is sleeved on the top of the second polygonal pin.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The pipe to be cut is inserted between the two groups of traction sticks and clamped by the traction sticks. The diameters of the two ends of the traction sticks are larger than the middle diameter, and multiple grooves are provided on the outside of the traction sticks. The gap between the two groups of traction sticks just matches the pipe. The grooves can increase the friction between the traction sticks and the pipe. When the two groups of traction sticks rotate in opposite directions relative to each other, the pipe can be stably pulled and moved without slipping or tilting, making the positioning more accurate during cutting and the yield rate higher.

[0014] The first rotary motor can drive the bidirectional threaded rod to rotate, thereby driving the two threaded sleeves to move synchronously in opposite directions, thereby driving the two horizontal support seats to rotate synchronously in opposite directions, thereby adjusting the distance between the two groups of traction rods. The two groups of traction rods can be adaptively adjusted according to the diameter of the pipe to be cut;

[0015] The traction stick with different side wall depression degrees can be replaced according to the pipe diameter, so that the traction stick can fit the side wall of pipes with different diameters to the greatest extent, further eliminating the possibility of slipping during traction; BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is an overall stereogram of the utility model;

[0018] Figure 2 This is an enlarged stereoscopic view of the pipeline traction mechanism of the utility model from the first perspective;

[0019] Figure 3 This is an enlarged stereoscopic view of the pipeline traction mechanism of the utility model from the second perspective

[0020] Figure 4 This is an enlarged stereoscopic view of the pipeline traction mechanism of the utility model from a third viewing angle;

[0021] Figure 5 This is an enlarged stereoscopic view of the pipeline traction mechanism of the utility model from a fourth viewing angle;

[0022] Figure 6 It is an enlarged cross-sectional view of the horizontal drive box of the utility model;

[0023] Figure 7 It is a first-angle stereoscopic view of the state where the transition plate and the upper baffle plate of the unloading conveyor belt of the utility model are aligned;

[0024] Figure 8 It is a second perspective stereoscopic diagram of the state where the transition plate and the upper baffle plate of the unloading conveyor belt of the utility model are aligned;

[0025] Fig. 9 It is a three-dimensional diagram of the alignment state of the transition plate and the lower baffle plate in the unloading conveyor belt of the utility model;

[0026] Fig.10 for Fig. 9 A zoomed-in detail of position A in the middle;

[0027] In the figure: 1 bracket, 2 pipeline traction mechanism, 201 horizontal drive box, 202 bidirectional threaded rod, 203 threaded sleeve, 204 first rotating motor, 205 connecting vertical rod, 3 horizontal support seat, 301 first mounting frame, 302 second mounting frame, 4 vertical rotating shaft, 401 synchronous wheel, 402 synchronous belt, 403 second rotating motor, 404 motor reducer, 405 first bevel gear, 406 synchronous horizontal shaft, 407 second bevel gear, 408 first polygonal latch, 409 first polygonal sleeve, 410 second polygonal latch, 5 traction rod, 501 second polygonal sleeve, 6 laser cutting machine, 7 pipe receiving frame, 701 upper baffle plate, 702 lower baffle plate, 703 first notch, 704 push-pull handle, 705 support leg, 706 universal wheel, 707 positioning screw, 708 nut, 709 installation port, 8 unloading conveyor belt, 801 baffle plate, 802 push rod motor, 803 rack, 804 horizontal rotating shaft, 805 spur gear, 806 connecting frame, 807 transition plate, 808 second notch. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0029] Reference Figure 1-10 A traction device for hydrogen pipeline production includes a bracket 1, a pipeline traction mechanism 2 and a laser cutting machine 6 are respectively fixed to the top of the bracket 1, a plurality of pipeline traction mechanisms 2 are provided, and the plurality of pipeline traction mechanisms 2 are evenly distributed at the top of the bracket 1, the laser cutting machine 6 is located directly above the gap between two of the pipeline traction mechanisms 2, and a material unloading conveyor belt 8 is also provided on one side of the bracket 1;

[0030] The pipe to be cut is horizontally pulled by the pipe pulling mechanism 2, and after being pulled to the appropriate position, it is cut by the laser cutting machine 6. After cutting, the finished short pipe is continued to be pulled to the unloading conveyor belt 8, and the remaining pipe is continued to be pushed and cut, and finally the long pipe is cut into finished short pipes.

[0031] The pipeline traction mechanism 2 includes a horizontal driving box 201, which is provided with two output ends, and a horizontal support seat 3 is fixed on both output ends. The horizontal driving box 201 is used to drive the two horizontal support seats 3 to move closer to or away from each other. The top ends of the two horizontal support seats 3 are respectively fixed with a first mounting frame 301 and a second mounting frame 302. The first mounting frame 301 and the second mounting frame 302 are both rotatably mounted with a plurality of vertical shafts 4. The top ends of the vertical shafts 4 are detachably mounted with traction sticks 5. The number of traction sticks 5 on the first mounting frame 301 and the second mounting frame 302 is the same and corresponds one to one.

[0032] The pipe to be cut is inserted between the two groups of traction rods 5 and clamped by the traction rods 5. The diameters at both ends of the traction rods 5 are larger than the middle diameter, and a plurality of grooves are provided on the outside of the traction rods 5. The gap between the two groups of traction rods 5 just matches the pipe. The grooves can increase the friction between the traction rods 5 and the pipe. When the two groups of traction rods 5 rotate in opposite directions relatively synchronously, the pipe can be stably pulled to move without slipping or tilting, so that the positioning during cutting is more accurate and the yield rate is higher. Example 2

[0033] Reference Figure 1-10 The difference between this embodiment and the first embodiment is that a horizontally arranged bidirectional threaded rod 202 is rotatably installed inside the horizontal driving box 201, and threaded sleeves 203 are threadedly installed on the outside of the two opposite threads at both ends of the bidirectional threaded rod 202, and the threaded sleeves 203 are horizontally slidably installed inside the horizontal driving box 201 through a slide rail slider mechanism, and a connecting vertical rod 205 is fixed to the top of the threaded sleeve 203, and the top of the connecting vertical rod 205 extends to the outside of the horizontal driving box 201 through a reserved sliding opening, and the tops of the two connecting vertical rods 205 are respectively fixed to the two horizontal support seats 3, and a first rotating motor 204 is fixed to the outside of the horizontal driving box 201, and the output shaft of the first rotating motor 204 is fixed to the bidirectional threaded rod 202;

[0034] The first rotary motor 204 can drive the bidirectional threaded rod 202 to rotate, thereby driving the two threaded sleeves 203 to move synchronously in opposite directions, thereby driving the two horizontal support seats 3 to rotate synchronously in opposite directions, thereby adjusting the distance between the two groups of traction rods 5. The two groups of traction rods 5 can be adaptively adjusted according to the diameter of the pipe to be cut;

[0035] A second polygonal pin 410 is fixed to the top of the vertical rotating shaft 4, and a second polygonal sleeve 501 is fixed to the bottom end of the traction rod 5. The second polygonal sleeve 501 is sleeved on the top of the second polygonal pin 410. The traction rod 5 can be replaced quickly and conveniently, so that while adjusting the distance between the two groups of traction rods 5, the traction rods 5 with different degrees of side wall depression can be replaced according to the diameter of the pipeline, so that the traction rod 5 can fit the side walls of pipelines of different diameters to the greatest extent, further eliminating the possibility of slipping during traction. Example 3

[0036] Reference Figure 1-10 The difference between this embodiment and embodiment 2 is that the adjacent vertical rotating shafts 4 located on the same side are synchronously driven by the synchronous wheel 401 and the synchronous belt 402, and each group of traction rods 5 are synchronously driven by the synchronous wheel 401 and the synchronous belt 402 in turn, and the power is transmitted one by one, so that after one of the traction rods 5 receives the power input, the whole group of traction rods 5 will rotate synchronously, thereby stabilizing the horizontal transportation of the traction pipeline.

[0037] The second mounting frame 302 is fixedly mounted with a second rotating motor 403, and the second rotating motor 403 is equipped with a motor reducer 404, and the output end of the motor reducer 404 is fixed to the bottom end of one of the vertical rotating shafts 4;

[0038] The second rotating motor 403 and the motor reducer 404 cooperate to drive one of the vertical rotating shafts 4 to rotate, thereby driving the entire group of traction rods 5 on the top of the second mounting frame 302 to rotate synchronously.

[0039] The first bevel gear 405 is fixed to the bottom end of a vertical shaft 4 on the first mounting frame 301 and the second mounting frame 302 which is farthest from the second rotating motor 403. A synchronous horizontal shaft 406 is also rotatably mounted on the first mounting frame 301 and the second mounting frame 302. The two synchronous horizontal shafts 406 are directly opposite to each other, and the ends of the two synchronous horizontal shafts 406 which are far away from each other are fixed with a second bevel gear 407, and the second bevel gear 407 is meshed with the first bevel gear 405. The ends of the two synchronous horizontal shafts 406 which are close to each other are respectively fixed with a first polygonal pin 408 and a first polygonal sleeve 409, and the first polygonal pin 408 is movably inserted into the first polygonal sleeve 409.

[0040] When the distance between the first mounting frame 301 and the second mounting frame 302 is adjusted according to the diameter of the pipe to be towed, the first polygonal pin 408 can always remain inserted in the first polygonal sleeve 409, thereby maintaining uninterrupted power transmission. The power transmission sequence is that after the vertical shaft 4 at the top of the second mounting frame 302 is driven to rotate by the motor reducer 404, the second bevel gear 407 on the end of the vertical shaft 4 is driven to rotate, and then the power is transmitted to one of the second bevel gears 407 through the first bevel gear 405, and then to the first polygonal pin 408 and the first polygonal sleeve 409, and then to the first bevel gear 405 and the second bevel gear 407 on the first mounting frame 301, thereby driving the entire set of traction rods 5 on the first mounting frame 301 to rotate in relative synchronous reverse directions. Example 4

[0041] Reference Figure 1-10 , the difference between the embodiment and the embodiment 1 is that the unloading conveyor belt 8 is arranged obliquely, a plurality of baffles 801 are fixed on the unloading conveyor belt 8, a pipe receiving frame 7 is placed on the ground at the lower end of the unloading conveyor belt 8, and an upper baffle plate 701 and a lower baffle plate 702 are respectively provided on the pipe receiving frame 7, the upper baffle plate 701 and the lower baffle plate 702 are both arranged obliquely, and the upper baffle plate 701 and the lower baffle plate 702 are parallel to each other, and the height of the upper baffle plate 701 and the lower baffle plate 702 close to one end of the unloading conveyor belt 8 is greater than the height of the upper baffle plate 701 and the lower baffle plate 702 away from the end of the unloading conveyor belt 8;

[0042] The cut short tubes are pushed onto the unloading conveyor belt 8. The blocking plates 801 are perpendicular to the unloading conveyor belt 8, and the blocking plates 801 are equidistantly distributed in the reverse direction of the transmission of the unloading conveyor belt 8. The short tubes are stuck above one of the blocking plates 801, and are transported toward the pipe receiving frame 7 as the unloading conveyor belt 8, and finally fall onto the pipe receiving frame 7 for centralized storage. When the pipe receiving frame 7 is full of short tubes, they can be transported away in a centralized manner. Example 5

[0043] Reference Figure 1-10 , the difference between the embodiment and the embodiment 4 is that a horizontal rotating shaft 804 is installed on the unloading conveyor belt 8, a connecting frame 806 is fixed on the horizontal rotating shaft 804, a transition plate 807 is fixed on the connecting frame 806, a plurality of first notches 703 are opened on the upper baffle plate 701 and the lower baffle plate 702, a plurality of second notches 808 are opened on the transition plate 807, the first notches 703 and the second notches 808 are just staggered, and the length of the upper baffle plate 701 is less than the length of the lower baffle plate 702;

[0044] The transition plate 807 is located between the pipe receiving frame 7 and the unloading conveyor belt 8. The short pipe on the unloading conveyor belt 8 first falls onto the transition plate 807, and then continues to roll down to the pipe receiving frame 7. The transition plate 807 can rotate. When the transition plate 807 rotates to Figure 8 When the transition plate 807 is in the state of being connected with the upper baffle plate 701, the short tubes at the top of the transition plate 807 will roll directly to the top of the upper baffle plate 701 for stacking. When the top of the upper baffle plate 701 is full of short tubes, the transition plate 807 is rotated to Fig. 9 State, at this time, the transition plate 807 is docked with the lower baffle 702, and because the length of the upper baffle 701 is smaller than the length of the lower baffle 702, the short tube at the top of the transition plate 807 will roll to the top of the lower baffle 702, thereby achieving the effect of automatically stacking the pipes in layers. It is simple and convenient to use, and the pipe receiving frame 7 can store more pipes.

[0045] Among them, a push rod motor 802 is fixedly installed on the support seat of the unloading conveyor belt 8, a rack 803 is fixed to the output shaft of the push rod motor 802, a spur gear 805 is fixed to the outside of the horizontal rotating shaft 804, and the rack 803 is meshed with the spur gear 805;

[0046] The push rod motor 802 can drive the rack 803 to move horizontally, and then drive the rack 803 to engage with the spur gear 805 to drive the horizontal shaft 804 to rotate, thereby switching the position of the transition plate 807.

[0047] Among them, a support leg 705 is fixed to the bottom end of the lower baffle 702, a universal wheel 706 is installed at the bottom end of the support leg 705, a push-pull handle 704 is installed on the pipe receiving frame 7, a vertical installation opening 709 is opened on the pipe receiving frame 7, and a positioning screw 707 is fixed on the upper baffle 701. The positioning screw 707 passes through the wall surface of the pipe receiving frame 7 through the vertical installation opening 709 and is fixed by a nut 708;

[0048] The pipe receiving frame 7 can be easily moved to facilitate the transfer of the pipe, and the upper baffle 701 can be fixed at different heights, so that the distance between the upper baffle 701 and the lower baffle 702 can be adjusted according to the pipes of different diameters, so that the distance between the upper baffle 701 and the lower baffle 702 can better match the diameter of the pipe, so that the pipe receiving frame 7 can store pipes of more diameters.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A traction device for hydrogen pipeline production, comprising a bracket (1), characterized in that: A pipeline traction mechanism (2) is fixed to the top of each support (1), and a plurality of pipeline traction mechanisms (2) are provided. The plurality of pipeline traction mechanisms (2) are equidistantly distributed at the top of the support (1). The pipeline traction mechanism (2) comprises a horizontal drive box (201), and the horizontal drive box (201) is provided with two output ends, and a horizontal support seat (3) is fixed to each of the two output ends. The horizontal drive box (201) is used to drive the two horizontal support seats (3) to move toward or away from each other. A first mounting frame (301) and a second mounting frame (302) are fixed to the tops of the two horizontal support seats (3), and a plurality of vertical rotating shafts (4) are rotatably mounted on the first mounting frame (301) and the second mounting frame (302). A traction rod (5) is detachably mounted on the top of the vertical rotating shaft (4), and the number of traction rods (5) on the first mounting frame (301) and the second mounting frame (302) is the same and corresponds to each other.

2. A traction device for hydrogen pipeline production according to claim 1, characterized in that: A horizontally arranged bidirectional threaded rod (202) is rotatably mounted inside the horizontal driving box (201), and threaded sleeves (203) are threadedly mounted on the outside of opposite threads at both ends of the bidirectional threaded rod (202). The threaded sleeve (203) is horizontally slidably mounted inside the horizontal driving box (201) via a slide rail and slider mechanism, and a connecting vertical rod (205) is fixed to the top end of the threaded sleeve (203). The top end of the connecting vertical rod (205) extends to the outside of the horizontal driving box (201) through a reserved sliding opening, and the top ends of the two connecting vertical rods (205) are respectively fixed to two horizontal support seats (3). A first rotating motor (204) is fixed to the outside of the horizontal driving box (201), and the output shaft of the first rotating motor (204) is fixed to the bidirectional threaded rod (202).

3. A traction device for hydrogen pipeline production according to claim 2, characterized in that: The adjacent vertical rotating shafts (4) located on the same side are synchronously driven via synchronous wheels (401) and synchronous belts (402).

4. A traction device for hydrogen pipeline production according to claim 3, characterized in that: A second rotating motor (403) is fixedly mounted on the second mounting frame (302), and a motor reducer (404) is mounted in conjunction with the second rotating motor (403), wherein an output end of the motor reducer (404) is fixed to the bottom end of one of the vertical rotating shafts (4).

5. A traction device for hydrogen pipeline production according to claim 4, characterized in that: A first bevel gear (405) is fixed to the bottom end of a vertical rotating shaft (4) on the first mounting frame (301) and the second mounting frame (302) which is farthest from the second rotating motor (403). A synchronous transverse shaft (406) is also rotatably mounted on the first mounting frame (301) and the second mounting frame (302). The two synchronous transverse shafts (406) are directly opposite to each other, and a second bevel gear (407) is fixed to the ends of the two synchronous transverse shafts (406) which are far away from each other. The second bevel gear (407) is meshed with the first bevel gear (405). A first polygonal latch (408) and a first polygonal sleeve (409) are respectively fixed to the ends of the two synchronous transverse shafts (406) which are close to each other. The first polygonal latch (408) is movably inserted into the first polygonal sleeve (409).

6. A traction device for hydrogen pipeline production according to claim 5, characterized in that: A second polygonal latch (410) is fixed to the top end of the vertical rotating shaft (4), the diameters of the two ends of the traction stick (5) are larger than the middle diameter, and a plurality of grooves are provided on the outside of the traction stick (5), and a second polygonal sleeve (501) is fixed to the bottom end of the traction stick (5), and the second polygonal sleeve (501) is sleeved on the top end of the second polygonal latch (410).

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