Suspension conveying equipment for carton processing

Abstract

The invention relates to the technical field of carton processing, and provides a suspension conveying device for carton processing, comprising a suspension bracket and a driving assembly; supporting frames are installed on the two sides of the hanging frame, a first chain wheel is installed on one side of the bottom end of the hanging frame, a second chain wheel is installed on the other side of the bottom end of the hanging frame, chains are installed on the outer sides of the first chain wheel and the second chain wheel, hooks are installed at the bottom end of the chains, and an automatic feeding structure is arranged on one side of the bottom end of the hanging frame. The automatic feeding structure comprises a conveyor, the conveyor is installed on one side of the bottom end of the hanging frame, a containing block is installed on one side of the conveyor, a moving groove is formed in one side in the containing block, an auxiliary block is installed at the top end of the moving groove, and fixing plates are installed on the two sides of one end of the hook. By means of the design of the automatic feeding structure, when carton blanks are rotationally conveyed, the carton blanks can be continuously conveyed to the top ends of the containing blocks through the conveyor, then the carton blanks are carried away by the moving hooks, and automatic feeding work is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of carton processing, and in particular to a suspension conveying device for carton processing. Background Art

[0002] Cartons are packaging containers made of paper as the main raw material. Due to their lightweight, easy processing, recyclable and low cost characteristics, they are widely used in many fields such as logistics and transportation, commodity packaging, and warehousing. In the process of processing cartons, the preliminarily processed carton blanks need to be transported, and conveying equipment is used during this process.

[0003] Conveying equipment is divided into traditional conveyor belt conveying equipment and suspended conveying equipment. Suspension conveying equipment is transported through aerial tracks and does not occupy ground space. The ground area can be completely left for core processing equipment such as printing machines, die-cutting machines, and baling machines, or used for warehousing and personnel passages. It is particularly suitable for small and medium-sized carton workshops (compact space). However, there are still some problems when using traditional suspended conveying equipment. Some traditional suspended conveying equipment often requires workers to place the carton blanks on hooks during the process of conveying the carton blanks, which leads to low work efficiency and increased labor costs during transportation. Therefore, a kind of suspended conveying equipment for carton processing is needed to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a hanging conveying equipment for carton processing, so as to solve the problem that the existing hanging conveying equipment often requires workers to place the carton blanks on hooks during the process of conveying the carton blanks, which leads to low work efficiency and increased labor costs during transportation.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A hanging conveying device for carton processing, comprising a hanging frame and a driving assembly;

[0006] Support frames are installed on both sides of the suspension frame, a first sprocket is installed on one side of the bottom end of the suspension frame, a second sprocket is installed on the other side of the bottom end of the suspension frame, chains are installed on the outsides of the first sprocket and the second sprocket, a hook is installed on the bottom end of the chain, and an automatic feeding structure is provided on one side of the bottom end of the suspension frame;

[0007] The automatic feeding structure includes a conveyor, which is installed on one side of the bottom end of the suspension frame, a placement block is installed on one side of the conveyor, a movable groove is opened on one side of the placement block, an auxiliary block is installed on the top of the movable groove, fixed plates are installed on both sides of one end of the hook, a connecting block is installed at one end of the fixed plate, a fixed cylinder is installed at one end of the connecting block, a rotating round block is installed on the outside of the fixed cylinder, a rubber ring is installed on the outside of the rotating round block, and a carton blank is placed on the top of the conveyor.

[0008] Preferably, a pawl is installed inside one side of the fixed cylinder, a ratchet is installed on the inner wall of the rotating circular block, a rotating groove is opened inside one side of the connecting block, a rotating sleeve is installed inside the rotating groove, and one side of the rotating sleeve is fixed to one side of the rotating circular block.

[0009] Preferably, a moving rod is installed at the bottom end of the auxiliary block, a spring is installed on the outside of the moving rod, a guide hole is opened at the bottom end of the moving groove, and the moving rod is inserted into the inside of the guide hole.

[0010] Preferably, both ends of the spring are fixed to the bottom end of the movable groove and the bottom end of the auxiliary block respectively, and a telescopic structure is formed between the spring and the auxiliary block.

[0011] Preferably, a driving assembly is installed at the top of the first sprocket, a tensioning structure is installed at the top of the second sprocket, a guide wheel is installed on one side of the top of the chain, a guide seat is installed at the bottom end of the guide wheel, one side of the top of the guide seat is fixed to the bottom end of the suspension frame, a protective plate is installed at the bottom end of the chain, the top of the protective plate is fixed to the bottom end of the suspension frame, and a lubrication structure is provided at the middle position of the top of the suspension frame.

[0012] Preferably, the lubrication structure includes a mounting groove, which is opened on one side of the middle position of the top end of the suspension bracket, a mounting plate is fixed on one side inside the mounting groove, a felt sprocket is installed at the middle position of the mounting plate, and a limiting sleeve is installed on the outer side of the top end of the felt sprocket.

[0013] Preferably, an oil storage tank is installed on one side of the top end of the installation groove, an oil pipeline is installed on one side of the bottom end of the oil storage tank, and the bottom end of the oil pipeline is rotatably sealed with the top end of the felt sprocket.

[0014] Preferably, a mounting head is installed at the bottom end of the oil storage tank, a scraper plate is installed on the outside of the mounting head, a connecting shaft is installed at the bottom end of the mounting head, a rotating disk is installed at the bottom end of the connecting shaft, a belt is provided on the outside of the rotating disk, and the rotating disk is connected to the limit sleeve through the belt.

[0015] Preferably, two groups of scraping plates are provided, and the two groups of scraping plates are symmetrically distributed on the outside of the mounting head.

[0016] Preferably, the hooks are provided in multiple groups, and the multiple groups of hooks are arranged at equal intervals at the bottom end of the chain.

[0017] The advantages of the hanging conveying equipment for carton processing provided by the present invention are:

[0018] Through the design of the automatic loading structure, when the carton blanks are rotated and transported, the conveyor can continuously transport the carton blanks to the top of the placement block, and then be carried away by the moving hook to complete the automatic loading work;

[0019] Furthermore, the conveyor belt inside the conveyor is made of polyethylene conveyor belt. The surface of polyethylene conveyor belt is smooth and the friction coefficient is extremely low. It is easy for relative sliding to occur between the bottom of the carton blank and the conveyor belt. When a group of carton blanks are placed on the placement block, the other cartons on the conveyor belt surface will be stacked together in sequence and then stay on the surface of the conveyor belt, making it more convenient for automatic loading and eliminating the need for manual loading, thereby improving work efficiency.

[0020] Furthermore, by cooperating with the rubber ring and the fixed cylinder, when the hook is completely inserted into the interior of the carton blank, as the hook moves, the rubber ring drives the rotating block to rotate on the outside of the fixed cylinder. By cooperating with the ratchet and the pawl, the rubber ring can only rotate forward and cannot be reversed. When the hook is completely inserted into the interior of the carton blank, the use of the rubber ring can increase the friction with the top of the inner part of the carton blank. Since the rubber ring cannot be reversed, the carton blank is not easy to fall off on the outside of the hook.

[0021] Furthermore, when the hook is inserted into the interior of the carton blank, the use of the auxiliary block can slightly block one side of the carton blank, thereby facilitating the hook to be completely inserted into the interior of the carton blank. Since a slope is provided on one side of the auxiliary block, it will be squeezed downward by the carton blank when it is subjected to force, making it convenient for the carton blank to move on the placement block. Since a spring is provided at the bottom end of the auxiliary block, when a group of carton blanks leave the top of the placement block, the use of the spring can restore the auxiliary block to its original position to block the next group of carton blanks, without the need for manual operation, thereby improving convenience.

[0022] By providing a lubricating structure and using the felt sprocket in conjunction with the oil storage tank, the lubricating oil can enter the interior of the felt sprocket and wet the felt sprocket. As the chain is in continuous contact with the felt sprocket, the chain is lubricated, reducing the friction between the chain and the first sprocket and the second sprocket, thereby increasing the service life of the chain.

[0023] Furthermore, as the felt sprocket rotates, the felt sprocket will drive the rotating disk to rotate through the limit sleeve, thereby driving the scraper plate to rotate to scrape the inner wall of the oil tank, to prevent the residual lubricating oil from being scattered on the inner wall of the oil tank and coming into contact with the metal surface for a long time during use as the lubricating oil inside the oil tank decreases, thereby causing oxidation reactions to occur, generating colloid, sludge, acidic substances and other oxidation products. When new oil is added, these deteriorated residues will directly contaminate the new oil, reducing pollution and completing the scraping work. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention when viewed from above;

[0026] Figure 3 It is a schematic diagram of a top-view cross-sectional three-dimensional structure of the present invention;

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the side cross-section of the present invention;

[0028] Figure 5 This is a schematic diagram of a three-dimensional structure of the present invention when viewed from above;

[0029] Figure 6 For the present invention Figure 4 A in the middle is a partial enlarged schematic diagram of the three-dimensional structure;

[0030] Figure 7 A schematic diagram of the three-dimensional structure of the lubrication structure of the present invention from a side view;

[0031] Figure 8 This is a schematic diagram of a three-dimensional structure of the lubrication structure of the present invention when viewed from above;

[0032] Figure 9 This is a schematic diagram of the three-dimensional structure of the automatic feeding structure of the present invention;

[0033] Figure 10 This is a side view of the three-dimensional structure of the automatic feeding structure of the present invention;

[0034] Figure 11 This is a three-dimensional schematic diagram of the automatic feeding structure of the present invention from a top view;

[0035] Figure 12 It is a schematic diagram of the three-dimensional structure of the automatic feeding structure of the present invention in side view;

[0036] Figure 13 This is a schematic diagram of the three-dimensional structure of the automatic feeding structure of the present invention facing the local explosion;

[0037] Figure 14This is a schematic diagram of the three-dimensional structure of the auxiliary block of the present invention from a side view;

[0038] Figure 15 For the present invention Figure 13 A partial enlarged schematic diagram of the three-dimensional structure at point B in the middle.

[0039] Explanation of reference numerals in the figure: 1. suspension frame; 2. driving assembly; 3. support frame; 4. hook; 5. automatic feeding structure; 501. conveyor; 502. fixed plate; 503. rotating round block; 504. rubber ring; 505. auxiliary block; 506. ratchet; 507. connecting block; 508. placing block; 509. moving groove; 5010. guide hole; 5011. spring; 5012. moving rod; 5013. fixed cylinder; 5014. rotating groove; 5015 , rotating sleeve; 5016, pawl; 6, tensioning structure; 7, lubrication structure; 701, oil storage tank; 702, connecting shaft; 703, rotating disk; 704, felt sprocket; 705, belt; 706, limiting sleeve; 707, oil pipeline; 708, mounting groove; 709, mounting head; 7010, scraper plate; 7011, mounting plate; 8, first sprocket; 9, chain; 10, second sprocket; 11, guide wheel; 12, guide seat; 13, protective plate; 14, carton blank. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] See also Figures 1-15 The present invention provides a hanging conveying equipment for carton processing, comprising a hanging frame 1 and a driving assembly 2; support frames 3 are installed on both sides of the hanging frame 1, a first sprocket 8 is installed on one side of the bottom end of the hanging frame 1, and a second sprocket 10 is installed on the other side of the bottom end of the hanging frame 1, a chain 9 is installed on the outer side of the first sprocket 8 and the second sprocket 10, a hook 4 is installed at the bottom end of the chain 9, and an automatic feeding structure 5 is provided on one side of the bottom end of the hanging frame 1.

[0042] The automatic feeding structure 5 includes a conveyor 501, which is installed on one side of the bottom end of the suspension frame 1, a placement block 508 is installed on one side of the conveyor 501, a moving groove 509 is opened on one side of the placement block 508, an auxiliary block 505 is installed on the top of the moving groove 509, fixed plates 502 are installed on both sides of one end of the hook 4, a connecting block 507 is installed on one end of the fixed plate 502, a fixed cylinder 5013 is installed on one end of the connecting block 507, a rotating block 503 is installed on the outside of the fixed cylinder 5013, a rubber ring 504 is installed on the outside of the rotating block 503, and a carton blank 14 is placed on the top of the conveyor 501; the inside of one side of the fixed cylinder 5013 is installed The pawl 5016 and the ratchet 506 are installed on the inner wall of the rotating circular block 503. A rotating groove 5014 is provided inside one side of the connecting block 507. A rotating sleeve 5015 is installed inside the rotating groove 5014. One side of the rotating sleeve 5015 is fixed to one side of the rotating circular block 503. A moving rod 5012 is installed at the bottom end of the auxiliary block 505. A spring 5011 is installed on the outer side of the moving rod 5012. A guide hole 5010 is provided at the bottom end of the moving groove 509. The moving rod 5012 is inserted into the inside of the guide hole 5010. The two ends of the spring 5011 are respectively fixed to the bottom end of the inside of the moving groove 509 and the bottom end of the auxiliary block 505. A telescopic structure is formed between the spring 5011 and the auxiliary block 505.

[0043] Reference Figures 9-15As shown: when the carton blank 14 is suspended and conveyed, the conveyor 501 is started. After starting, the conveyor 501 will drive the conveyor belt to move, thereby conveying the carton blank 14. During transportation, the carton blank 14 is placed on the conveyor belt, so that the carton blank 14 moves in sequence on the conveyor belt. When a group of carton blanks 14 moves to the placement block 508, the limit block on the top side of the placement block 508 can block the carton blank 14, so that the carton blank 14 stays on the placement block 508. Since the material of the conveyor belt inside the conveyor 501 is a polyethylene conveyor belt, the polyethylene conveyor belt has a smooth surface and an extremely low friction coefficient. Relative sliding is easy to occur between the bottom of the carton blank 14 and the conveyor belt, so that when a group of carton blanks 14 are on the placement block 508, the surface of the conveyor 501 is His cartons will be stacked and stay on the surface of the conveyor belt. When the carton blank 14 is at the top of the placement block 508, the drive component 2 is started to drive the first sprocket 8 to rotate. The first sprocket 8 will drive the chain 9 to move during the rotation. The chain 9 will drive the guide wheel 11 to move on the guide seat 12 when it moves. At this time, the use of the guide seat 12 can not only guide the chain 9, but also support the chain 9. The chain 9 will also drive the hook 4 to move when it moves. As the hook 4 moves, when the hook 4 moves to the position of the placement block 508, one end of the hook 4 will be inserted into the interior of the carton blank 14. When one end of the hook 4 is inserted into the interior of the carton blank 14, the rubber ring 504 will contact the top of the inside of the carton blank 14. As the hook 4 moves When the hook 4 is inserted into the carton blank 14, the auxiliary block 505 can be used to slightly block one side of the carton blank 14, thereby facilitating the complete insertion of the hook 4 into the carton blank 14. When the carton blank 14 is inside, as the chain 9 moves, the hook 4 will drive the carton blank 14 to move to one side. At this time, the hook 4 will give the carton blank 14 a thrust. Since one side of the auxiliary block 505 is provided with a slope, it will be squeezed downward by the carton blank 14 when it is stressed. When the carton blank 14 is squeezed downward, the moving rod 5012 will move inside the guide hole 5010 and squeeze the spring 5011 to contract. At this time, the use of the spring 5011 can restore the carton blank 14 to its original position when it leaves the top of the placement block 508 to block the next group of carton blanks 14. As the conveyor 501 continuously transports the carton blank 14 to the top of the placement block 508, combined with the continuously moving hook 4, automatic loading of the carton blank 14 is realized without the need for manual hanging.It makes the transportation more convenient and more efficient, thereby completing the automatic loading of the carton blank 14.

[0044] A driving component 2 is installed on the top of the first sprocket 8, a tensioning structure 6 is installed on the top of the second sprocket 10, a guide wheel 11 is installed on one side of the top of the chain 9, a guide seat 12 is installed on the bottom end of the guide wheel 11, one side of the top of the guide seat 12 is fixed to the bottom end of the suspension frame 1, a protective plate 13 is installed on the bottom end of the chain 9, the top of the protective plate 13 is fixed to the bottom end of the suspension frame 1, a lubrication structure 7 is provided at the middle position of the top of the suspension frame 1; the lubrication structure 7 includes a mounting groove 708, the mounting groove 708 is opened on one side at the middle position of the top of the suspension frame 1, a mounting plate 7011 is fixed on one side inside the mounting groove 708, a felt sprocket 704 is installed at the middle position of the mounting plate 7011, and a limiting sleeve 706 is installed on the outer side of the top of the felt sprocket 704; An oil storage tank 701 is installed on one side of the top of the mounting groove 708, and an oil delivery pipe 707 is installed on one side of the bottom end of the oil storage tank 701, and the bottom end of the oil delivery pipe 707 is rotatably sealed and connected to the top of the felt sprocket 704; a mounting head 709 is installed at the bottom end of the inside of the oil storage tank 701, and a scraper plate 7010 is installed on the outside of the mounting head 709, and a connecting shaft 702 is installed at the bottom end of the mounting head 709, and a rotating disk 703 is installed at the bottom end of the connecting shaft 702, and a belt 705 is provided on the outside of the rotating disk 703, and the rotating disk 703 is connected to the limit sleeve 706 through the belt 705; two groups of scraper plates 7010 are provided, and the two groups of scraper plates 7010 are symmetrically distributed on the outside of the mounting head 709; multiple groups of hooks 4 are provided, and the multiple groups of hooks 4 are arranged at equal intervals at the bottom end of the chain 9.

[0045] Reference Figures 1-8As shown: in the process of chain 9 moving, when passing the position of felt sprocket 704, it will drive felt sprocket 704 to rotate. Since the oil delivery pipe 707 and the top of the felt sprocket 704 are connected in a rotary seal, the lubricating oil inside the oil storage tank 701 can continuously enter the interior of the felt sprocket 704, wetting the felt sprocket 704. As the chain 9 is constantly in contact with the felt sprocket 704, the chain 9 is lubricated, reducing the friction between the chain 9 and the first sprocket 8 and the second sprocket 10, thereby improving the service life of the chain 9. Since the interior of the oil delivery pipe 707 is filled with sponge, the flow rate of the lubricating oil can be reduced, so that it can slowly and continuously flow to the interior of the felt sprocket 704. When the felt sprocket 704 rotates, the limiting sleeve 706 will rotate at the top of the mounting plate 7011. At this time, the rotating limiting sleeve 706 can not only limit the felt sprocket 704, but also make the felt sprocket 704 The felt sprocket 704 will only rotate inside the mounting plate 7011, and will also drive the rotating disk 703 to rotate. During the rotation of the rotating disk 703, the mounting head 709 will be driven to rotate. During the rotation of the mounting head 709, the scraper plate 7010 will be driven to rotate, thereby scraping the inner wall of the oil storage tank 701 to prevent the residual lubricating oil from being in long-term contact with the metal surface of the inner wall of the oil storage tank 701 during use as the lubricating oil inside the oil storage tank 701 decreases, and oxidation reactions occur to generate colloid, sludge, acidic substances and other oxidation products. When new oil is added, these deteriorated residues will directly contaminate the new oil, thereby completing the scraping work. When the chain 9 is loose during work, the tensioning structure 6 can also be used to push the second sprocket 10 to move, and the chain 9 can be tensioned to prevent the chain 9 from affecting the work due to relaxation, and finally completing the hanging and conveying of the carton blank 14.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hanging conveying device for carton processing, characterized by: It comprises a suspension frame (1) and a drive assembly (2); Support frames (3) are installed on both sides of the suspension frame (1), a first sprocket (8) is installed on one side of the bottom end of the suspension frame (1), a second sprocket (10) is installed on the other side of the bottom end of the suspension frame (1), a chain (9) is installed on the outer sides of the first sprocket (8) and the second sprocket (10), a hook (4) is installed at the bottom end of the chain (9), and an automatic feeding structure (5) is provided on one side of the bottom end of the suspension frame (1); The automatic feeding structure (5) includes a conveyor (501), which is installed on one side of the bottom end of the hanging frame (1), a placement block (508) is installed on one side of the conveyor (501), a movable groove (509) is opened on one side of the placement block (508), an auxiliary block (505) is installed on the top of the movable groove (509), fixed plates (502) are installed on both sides of one end of the hook (4), a connecting block (507) is installed on one end of the fixed plate (502), a fixed cylinder (5013) is installed on one end of the connecting block (507), a rotating circular block (503) is installed on the outer side of the fixed cylinder (5013), a rubber ring (504) is installed on the outer side of the rotating circular block (503), and a carton blank (14) is placed on the top of the conveyor (501).

2. The hanging conveying equipment for carton processing according to claim 1, characterized in that: A pawl (5016) is installed inside one side of the fixed cylinder (5013), a ratchet (506) is installed on the inner wall of the rotating circular block (503), a rotating groove (5014) is opened inside one side of the connecting block (507), a rotating sleeve (5015) is installed inside the rotating groove (5014), and one side of the rotating sleeve (5015) is fixed to one side of the rotating circular block (503).

3. The hanging conveying equipment for carton processing according to claim 1, characterized in that: A moving rod (5012) is installed at the bottom end of the auxiliary block (505), a spring (5011) is installed on the outside of the moving rod (5012), a guide hole (5010) is opened at the bottom end of the moving groove (509), and the moving rod (5012) is inserted into the inside of the guide hole (5010).

4. The hanging conveying equipment for carton processing according to claim 3, characterized in that: The two ends of the spring (5011) are respectively fixed to the inner bottom end of the movable groove (509) and the bottom end of the auxiliary block (505), and a telescopic structure is formed between the spring (5011) and the auxiliary block (505).

5. The hanging conveying equipment for carton processing according to claim 1, characterized in that: A driving assembly (2) is installed at the top of the first sprocket (8), a tensioning structure (6) is installed at the top of the second sprocket (10), a guide wheel (11) is installed on one side of the top of the chain (9), a guide seat (12) is installed at the bottom of the guide wheel (11), one side of the top of the guide seat (12) is fixed to the bottom of the suspension frame (1), a protective plate (13) is installed at the bottom of the chain (9), the top of the protective plate (13) is fixed to the bottom of the suspension frame (1), and a lubrication structure (7) is provided at the middle position of the top of the suspension frame (1).

6. The hanging conveying equipment for carton processing according to claim 5, characterized in that: The lubricating structure (7) comprises a mounting groove (708), wherein the mounting groove (708) is provided on one side of the middle position of the top end of the suspension frame (1), a mounting plate (7011) is fixed on one side inside the mounting groove (708), a felt sprocket (704) is mounted at the middle position of the mounting plate (7011), and a limiting sleeve (706) is mounted on the outer side of the top end of the felt sprocket (704).

7. The hanging conveying equipment for carton processing according to claim 6, characterized in that: An oil storage tank (701) is installed on one side of the top end of the installation groove (708), and an oil delivery pipe (707) is installed on one side of the bottom end of the oil storage tank (701). The bottom end of the oil delivery pipe (707) is rotatably sealed with the top end of the felt sprocket (704).

8. The hanging conveying equipment for carton processing according to claim 7, characterized in that: A mounting head (709) is installed at the bottom end of the oil storage tank (701), a scraper plate (7010) is installed on the outside of the mounting head (709), a connecting shaft (702) is installed at the bottom end of the mounting head (709), a rotating disk (703) is installed at the bottom end of the connecting shaft (702), a belt (705) is provided on the outside of the rotating disk (703), and the rotating disk (703) is connected to a limiting sleeve (706) via the belt (705).

9. The hanging conveying equipment for carton processing according to claim 8, characterized in that: Two groups of the scraping plates (7010) are provided, and the two groups of the scraping plates (7010) are symmetrically distributed on the outside of the mounting head (709).

10. The hanging conveying equipment for carton processing according to claim 1, characterized in that: The hooks (4) are provided in multiple groups, and the multiple groups of hooks (4) are arranged at equal intervals at the bottom end of the chain (9).

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