A conveying chain replacement device and method for a blank feeding car

Abstract

The application discloses a kind of conveying chain replacement device and method for blank feeding car in chain replacement technical field, including bottom fixed frame;Setting in the lower support frame of bottom fixed frame top;Setting in the upper support frame of lower support frame top;Rotatably set on the chain-out sprocket of lower support frame;Rotatably set on the chain-in sprocket of upper support frame;Setting in the side of lower support frame, and with the transmission connection of chain-out sprocket driving motor.The application adopts the mode that chain unloading and chain loading simultaneously, is equipped with chain-out sprocket and chain-in sprocket in one end of conveying chain, can be supported to conveying chain by chain-out sprocket, chain-in sprocket, and utilizes the meshing transmission of sprocket and chain, drives the forward movement of old chain and new chain connected as a whole, to realize the synchronous performance of old chain unloading operation and new chain loading operation, can quickly complete the replacement operation of conveying chain, and reduce labor intensity.

Description

Technical Field

[0001] This invention relates to the field of chain replacement technology, specifically to a conveyor chain replacement device and method for a billet feeding vehicle. Background Technology

[0002] After undergoing processes such as casting, cutting, deburring, and finishing, the slabs produced by continuous casting in steel plants are transported along the conveying track by a billet delivery trolley (slab conveying trolley) to the next process such as grinding. The movement of the billet delivery trolley is driven by a conveying chain. After the billet delivery trolley has been running for a period of time, the conveying chain will experience unpredictable damage such as wear and deformation, and therefore needs to be replaced regularly.

[0003] Because the conveyor chain of the billet delivery car is large in size and heavy in weight, it can only be lifted section by section by the overhead crane above the conveyor track. However, since a large number of chain segments are required for each replacement, there are problems such as high manpower consumption, low labor efficiency, high risk and long replacement time. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a conveyor chain replacement device for a billet feeding car, so as to solve the technical problem of low labor efficiency in existing chain replacement methods.

[0005] The technical solution adopted in this invention is: a conveyor chain replacement device for a billet feeding car, comprising:

[0006] A bottom mounting bracket, which can be detachably and fixedly connected to the transverse track;

[0007] The lower support frame is disposed on top of the bottom fixing frame;

[0008] An upper support frame is disposed on top of the lower support frame;

[0009] The chain-leading sprocket is rotatably mounted on the lower support frame and is used to connect with the old chain drive and pull the old chain to move.

[0010] A chain feed sprocket is rotatably mounted on the upper support frame and is used to connect with the new chain drive and drive the new chain to move.

[0011] A drive motor is located on one side of the lower support frame and is connected to the chain sprocket for transmission.

[0012] Preferably, the upper support frame and the lower support frame are detachably connected.

[0013] Preferably, the bottom of the upper support frame is provided with a first longitudinal connecting hole, and the top of the lower support frame is provided with a second longitudinal connecting hole. The first longitudinal connecting hole and the second longitudinal connecting hole are provided with connecting bolts to fix the upper support frame and the lower support frame together.

[0014] Preferably, the bottom of the upper support frame is provided with a first transverse connecting hole, and the lower support frame is provided with a plurality of second transverse connecting holes linearly distributed along the vertical direction. The first transverse connecting hole and the second transverse connecting hole are provided with connecting bolts to fix the upper support frame and the lower support frame together.

[0015] Preferably, the upper support frame is fixedly connected to upper mounting plates at both ends, and an upper rotating shaft is provided between the two upper mounting plates, with the chain feed sprocket fixedly connected to the upper rotating shaft; the lower support frame is fixedly connected to lower mounting plates at both ends, and a lower rotating shaft is provided between the two lower mounting plates, with the chain feed sprocket fixedly connected to the lower rotating shaft.

[0016] Preferably, the bottom fixing frame is provided with connecting plates on both sides, and the connecting plates are threaded with tightening bolts. The ends of the tightening bolts abut against the transverse track to fix the bottom fixing frame in the horizontal direction.

[0017] Preferably, the connecting plate includes a horizontal part and a vertical part that are fixedly connected. The vertical part is connected to the bottom fixing frame, and the vertical part is provided with a threaded through hole that mates with the tightening bolt. The horizontal part abuts against the transverse track and is used to fix the bottom fixing frame in the vertical direction.

[0018] Preferably, the connecting plate includes a fixed connecting plate and a movable connecting plate. The vertical part of the fixed connecting plate is fixedly connected to the side of the bottom fixed frame away from the conveying track. The vertical part of the movable connecting plate is detachably connected to the side of the bottom fixed frame near the conveying track by connecting bolts.

[0019] Preferably, the chain output sprocket and the chain delivery sprocket are staggered vertically.

[0020] Another object of the present invention is to provide a method for replacing the conveyor chain of a billet feeding car, the method using the above-mentioned conveyor chain replacement device for a billet feeding car, the method comprising the following steps:

[0021] S10: Lift the bottom fixing frame onto the transverse track and fix the bottom fixing frame to the transverse track by tightening the top bolts;

[0022] S20: Disassemble the old chain, engage the head of the old chain with the output sprocket for transmission, and at the same time connect the tail of the old chain with the head of the new chain and engage it with the feed sprocket for transmission.

[0023] S30: Start the drive motor to drive the output sprocket to rotate until the head of the new chain moves to engage with the output sprocket; S40: Connect the head and tail of the new chain.

[0024] The beneficial effects of this invention are:

[0025] 1. This invention adopts a method of simultaneous chain unloading and chain reinstallation. A chain output sprocket and a chain delivery sprocket are provided at one end of the conveyor chain. The conveyor chain can be supported by the chain output sprocket and the chain delivery sprocket. The meshing transmission between the sprocket and the chain drives the old chain and the new chain connected as one unit to move forward, so as to realize the simultaneous unloading of the old chain and the reinstallation of the new chain. The conveyor chain replacement operation can be completed quickly and the labor intensity can be reduced.

[0026] 2. The chain feed sprocket and chain delivery sprocket in this invention are staggered, which allows the new chain and the old chain to be placed side by side to prevent friction between the new chain and the old chain during loading and unloading, thus ensuring the service life of the new chain.

[0027] 3. The upper support frame and the lower support frame in this invention are detachably connected, which makes the size of the entire replacement device adjustable, facilitating the hoisting and storage of the device; at the same time, the distance between the chain output sprocket and the chain feed sprocket can be adjusted by connecting and fixing the upper support frame and the lower support frame at different positions, thereby expanding the applicability of the device.

[0028] 4. The present invention has connecting plates on both sides of the bottom fixing frame. The bottom fixing frame can be fixed in the horizontal direction by the abutting cooperation between the bolts on the connecting plates and the transverse track. The connecting plates in the present invention are L-shaped and can be fixed in the vertical direction by the abutting cooperation between the connecting plates and the bottom of the transverse track, so as to ensure the stability of the device during the replacement operation. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the conveyor chain replacement device for the billet feeding vehicle of the present invention;

[0030] Figure 2 This is a front view of the conveyor chain replacement device for the billet feeding car of the present invention;

[0031] Figure 3 This is a schematic diagram showing the connection between the bottom fixing frame and the connecting plate;

[0032] Figure 4 This is one of the schematic diagrams showing the connection between the upper support frame and the lower support frame;

[0033] Figure 5 This is the second schematic diagram showing the connection between the upper support frame and the lower support frame;

[0034] Figure 6 This is a reference diagram showing the usage state of the conveyor chain replacement device for the billet feeding car of the present invention.

[0035] Explanation of the reference numerals in the figure:

[0036] 100. Bottom mounting bracket;

[0037] 110. Connecting hole;

[0038] 200. Lower support frame;

[0039] 210. Lower mounting plate; 220. Lower rotating shaft; 230. Lower steel frame;

[0040] 300. Upper support frame;

[0041] 310. Upper mounting plate; 320. Upper rotating shaft; 330. Upper steel frame; 340. Connecting steel section; 350. Connecting bolts;

[0042] 400. Chain sprocket;

[0043] 500. Chain feed sprocket;

[0044] 600. Drive motor;

[0045] 700, connecting plate;

[0046] 710. Horizontal section; 720. Vertical section; 730. Tightening bolt; 740. Threaded through hole;

[0047] 800. Lateral track;

[0048] 900. Conveying track. Detailed Implementation

[0049] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0050] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0053] Examples, such as Figures 1-6 As shown, a conveyor chain replacement device for a billet feeding car is used to be fixedly installed on a transverse track 800 at one end of a conveyor track 900, and to simultaneously perform disassembly and reassembly of the conveyor chain; the replacement device includes:

[0054] A bottom mounting bracket 100 is detachably and securely connected to the transverse track 800.

[0055] A lower support frame 200 is fixedly mounted on the top of the bottom fixing frame 100.

[0056] An upper support frame 300 is disposed on top of the lower support frame 200.

[0057] A chain sprocket 400 is rotatably mounted on the lower support frame 200. The axis of the chain sprocket 400 is perpendicular to the extension direction of the conveying track 900 and parallel to the extension direction of the transverse track 800. It is used to connect with the old chain drive and pull the old chain to move.

[0058] A chain feed sprocket 500 is rotatably mounted on the upper support frame 300. The axis of the chain feed sprocket 500 is perpendicular to the extension direction of the conveying track 900 and parallel to the extension direction of the transverse track 800. It is used to connect with the new chain drive and drive the new chain to move.

[0059] A drive motor 600 is fixedly mounted on one side of the lower support frame 200 and is connected to the chain sprocket 400 for driving the chain sprocket 400 to rotate.

[0060] This application adopts a method of simultaneous chain unloading and chain reinstallation. A chain output sprocket 400 is provided on the lower support frame 200, and a chain feeding sprocket 500 is provided on the upper support frame 300. The chain output sprocket 400 and the chain feeding sprocket 500 support the conveyor chain, and the meshing transmission between the chain output sprocket 400 and the chain feeding sprocket 500 and the conveyor chain drives the old chain and the new chain connected as one unit to move forward. This realizes the simultaneous unloading of the old chain and the reinstallation of the new chain, which can quickly complete the replacement of the conveyor chain, reduce labor intensity, and save human resources.

[0061] In one specific embodiment, such as Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, the bottom of the upper support frame 300 is detachably connected to the top of the lower support frame 200. This is because: by using a detachable connection to fix the upper support frame 300 and the lower support frame 200 together, the replacement device can be disassembled into upper and lower parts, which facilitates the hoisting and storage of the replacement device. Furthermore, by replacing the upper support frame 300, the distance between the chain sprocket 400 and the chain feed sprocket 500 can be adjusted, thereby expanding the applicability of the device.

[0062] In one specific embodiment, such as Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, the upper support frame 300 includes two parallel n-shaped upper steel frames 330. An upper mounting plate 310 is fixedly connected to the top of each upper steel frame 330. An upper rotating shaft 320 is located between the two upper mounting plates 310. Both ends of the upper rotating shaft 320 are rotatably connected to the upper mounting plates 310 via bearings, and the chain feed sprocket 500 is fixedly connected to the upper rotating shaft 320. The lower support frame 200 includes two parallel n-shaped lower steel frames 230. A lower mounting plate 210 is fixedly connected to the top of each lower steel frame 230. A lower rotating shaft 220 is located between the two lower mounting plates. Both ends of the lower rotating shaft 220 are rotatably connected to the lower mounting plates 210 via bearings, and the chain feed sprocket 500 is fixedly connected to the lower rotating shaft 220. This configuration is chosen because using steel frames and rotating shafts to support the sprocket has the advantages of simple structure and ease of manufacture.

[0063] Preferred, such as Figure 4As shown, connecting steel sections 340 are fixedly connected to the bottom of the upper steel frame 330. Two connecting steel sections 340 are fixedly connected to the outer side of the bottom end of the upper steel frame 330, and the connecting steel sections 340 are provided with first longitudinal connecting holes (not shown in the figure). At both ends of the top of the lower steel frame 230, second longitudinal connecting holes (not shown in the figure) are provided, corresponding one-to-one with the first longitudinal connecting holes. Connecting bolts 350 are provided in the first and second longitudinal connecting holes, which can fix the upper support frame 300 and the lower support frame 200 together. This arrangement is because bolted connections have the advantage of easy disassembly, allowing for quick connection and fixation of the upper support frame 300 and the lower support frame 200.

[0064] Preferred, such as Figure 5 As shown, a first transverse connecting hole (not shown) is provided at the bottom of the upper steel frame 330, and a second transverse connecting hole (not shown) is provided on the lower steel frame 230 to mate with the first transverse connecting hole. Multiple second transverse connecting holes are linearly distributed vertically, and connecting bolts 350 are provided in both the first and second transverse connecting holes. These connecting bolts 350 can fix the upper support frame 300 and the lower support frame 200 together. This arrangement is because, through the cooperation of the first transverse connecting hole on the upper steel frame 330 and the different second transverse connecting holes on the lower steel frame 230, not only can the upper support frame 300 and the lower support frame 200 be fixedly connected, but the distance between the chain output sprocket 400 and the chain feed sprocket 500 can also be adjusted, thereby expanding the applicability of the replacement device.

[0065] In one specific embodiment, such as Figure 1 , Figure 2 , Figure 3 As shown, the bottom fixing frame 100 is a rectangular steel frame. Connecting plates 700 are provided on the front and rear sides of the bottom fixing frame 100. Tightening bolts 730 are threaded onto the connecting plates 700, and the ends of the tightening bolts 730 abut against the transverse rail 800 to fix the bottom fixing frame 100 horizontally. This arrangement is because, when changing the conveyor chain, the replacement device needs to be fixed to the vertically arranged transverse rail 800 at one end of the conveyor rail 900. The connecting plates 700 on the front and rear sides of the bottom fixing frame 100, through the abutment between the tightening bolts 730 on the connecting plates 700 and the transverse rail 800, clamp the replacement device onto the transverse rail 800.

[0066] Preferred, such as Figure 3As shown, the connecting plate 700 is an L-shaped steel plate and includes a horizontal part 710 and a vertical part 720 for fixed connection. The vertical part 720 is connected to the bottom fixing frame 100, and the vertical part 720 is provided with a threaded through hole 740 that mates with the tightening bolt 730. The horizontal part 710 abuts against the transverse track 800 for fixing the bottom fixing frame 100 in the vertical direction. This arrangement is because when the drive motor 600 drives the output sprocket 400 to rotate, the output sprocket 400 will exert a backward force on the conveyor chain, and the reaction force of the conveyor chain on the output sprocket 400 will cause the bottom fixing frame 100 to have a tendency to tilt forward, thereby affecting the stability of the replacement device. After the connecting plate 700 is set in an L-shape, the horizontal part 710 can abut against the transverse track 800, so that the transverse track 800 can exert a vertical downward force on the bottom fixing frame 100. This force can balance part of the force exerted by the conveyor chain on the output sprocket 400, thereby ensuring the stability of the replacement device on the transverse track 800.

[0067] Preferred, such as Figure 3 As shown, there are two types of connecting plates 700: a fixed connecting plate and a movable connecting plate. The vertical part 720 of the fixed connecting plate is fixedly connected to the side of the bottom fixing frame 100 away from the conveying track 900, that is, the fixed connecting plate is fixedly connected to the rear side of the bottom fixing frame 100. The vertical part 720 of the movable connecting plate is detachably connected to the side of the bottom fixing frame 100 near the conveying track 900 by connecting bolts 350, that is, the movable connecting plate is detachably connected to the front side of the bottom fixing frame 100. This design is because: the distance between the horizontal portions 710 of the two connecting plates 700 is less than the width of the transverse track 800, making it impossible to directly suspend the bottom fixing frame 100 onto the transverse track 800; by fixing one connecting plate 700 to the bottom fixing frame 100 and detachably connecting the other connecting plate 700 to the bottom fixing frame 100, the bottom fixing frame 100 can be directly suspended onto the transverse track. Then, the movable connecting plate is fixedly connected to the bottom fixing frame 100, thus vertically fixing the bottom fixing frame 100 with the horizontal portions 710 of both the movable and fixed connecting plates. Simultaneously, since the changing device tends to tilt forward under the action of the conveyor chain during the conveyor chain replacement operation, fixing the fixed connecting plate to the rear side of the bottom fixing frame 100, that is, the side of the bottom fixing frame 100 furthest from the conveyor track 900, allows the horizontal portion 710 of the fixed connecting plate to abut against the transverse track 800, balancing part of the force exerted by the conveyor chain on the changing device and effectively solving the forward tilting problem.

[0068] In one specific embodiment, such as Figure 2As shown, the output sprocket 400 and the feed sprocket 500 are staggered vertically, meaning the feed sprocket 500 is positioned slightly above and to the side of the output sprocket 400. This arrangement is because the unloading of the old chain and the reinstallation of the new chain both occur on the same side of the replacement device. Positioning the feed sprocket 500 slightly above and to the side of the output sprocket 400 creates a misalignment between the old and new chains, preventing friction between them and thus ensuring the lifespan of the new chain.

[0069] An embodiment provides a method for replacing the conveyor chain of a billet feeding car. This method uses the aforementioned conveyor chain replacement device for billet feeding cars and includes the following steps:

[0070] S10: First, use a crane to lift the bottom fixing frame 100 together with the lower support frame 200 onto the transverse track 800; then use connecting bolts 350 to fix the movable connecting plate to the bottom fixing frame 100; finally, use screws to tighten the top bolts 730 to clamp and fix the bottom fixing frame 100 onto the transverse track 800.

[0071] S20: Disassemble the old chain, engage the lower end of the old chain with the output sprocket 400 for transmission, and simultaneously connect the upper end of the old chain with the head of the new chain and engage it with the feed sprocket 500 for transmission.

[0072] S30: Start the drive motor 600 to drive the output sprocket 400 to rotate, so that the old chain slowly moves to the rear of the replacement device. The old chain that is driven out is cut and placed after being judged by the operator to a suitable length. The number of cuts should be less than 3 times, until the head of the new chain moves to mesh with the output sprocket 400.

[0073] S40: Connect the head and tail of the new chain.

[0074] Compared with the prior art, this application has at least the following beneficial technical effects:

[0075] The application of the replacement device in this application changes the construction method and reduces the number of segment cuttings and hoisting operations of the conveyor chain. In actual production activities, after three whole conveyor chain replacement projects, the average time of the whole conveyor chain replacement process was calculated as follows:

[0076] The process involves: opening the old conveyor chain connector for 15 minutes; connecting the new conveyor chain to the old conveyor chain for 15 minutes; removing the old conveyor chain using the replacement device; synchronously reinstalling the new conveyor chain for 120 minutes; connecting the head and tail of the new conveyor chain for 15 minutes; and commissioning for 30 minutes. The entire project takes a total of 180 minutes.

[0077] The replacement device of this application can transport the old conveyor chain directly to the outside of the track without the need for a crane. This not only reduces the need for multiple cutting and separate lifting of the old conveyor chain, but also reduces the need for separate lifting and splicing of the new conveyor chain. This allows the new conveyor chain to be directly reinstalled in the conveyor chain track along with the old conveyor chain, avoiding the repetitive and cumbersome lifting and installation procedures.

[0078] The replacement device proposed in this application solves the problems of difficult installation and maintenance, long maintenance period, low maintenance efficiency and high safety risks.

[0079] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A conveyor chain replacement device for a billet feeding car, characterized in that, include: A bottom mounting bracket (100) is detachably and fixedly connected to a transverse track (800); A lower support frame (200) is disposed on top of a bottom fixing frame (100); An upper support frame (300) is disposed on top of a lower support frame (200); The chain sprocket (400) is rotatably mounted on the lower support frame (200) and is used to connect with the old chain drive and pull the old chain to move. A chain feed sprocket (500) is rotatably mounted on an upper support frame (300) and is used to connect with the new chain drive and drive the new chain to move. A drive motor (600) is disposed on one side of the lower support frame (200) and is connected to the chain sprocket (400) for transmission. The bottom fixing frame (100) is provided with connecting plates (700) on both sides. The connecting plates (700) are threaded with tightening bolts (730). The ends of the tightening bolts (730) abut against the transverse rail (800) to fix the bottom fixing frame (100) in the horizontal direction. The connecting plate (700) includes a horizontal part (710) and a vertical part (720) that are fixedly connected. The vertical part (720) is connected to the bottom fixing frame (100), and the vertical part (720) is provided with a threaded through hole (740) that cooperates with the tightening bolt (730). The horizontal part (710) abuts against the transverse track (800) and is used to fix the bottom fixing frame (100) in the vertical direction.

2. The conveyor chain replacement device for a billet feeding car according to claim 1, characterized in that, The upper support frame (300) and the lower support frame (200) are detachably connected.

3. The conveyor chain replacement device for a billet feeding car according to claim 2, characterized in that, The bottom of the upper support frame (300) is provided with a first longitudinal connecting hole, and the top of the lower support frame (200) is provided with a second longitudinal connecting hole. The first longitudinal connecting hole and the second longitudinal connecting hole are provided with connecting bolts (350) for fixing the upper support frame (300) and the lower support frame (200).

4. The conveyor chain replacement device for a billet feeding car according to claim 2, characterized in that, The bottom of the upper support frame (300) is provided with a first transverse connection hole, and the lower support frame (200) has a plurality of second transverse connection holes linearly distributed along the vertical direction. The first transverse connection hole and the second transverse connection hole are provided with connecting bolts (350) for fixing the upper support frame (300) and the lower support frame (200).

5. A conveyor chain replacement device for a billet feeding car according to any one of claims 1-3, characterized in that, The upper support frame (300) is fixedly connected to two upper mounting plates (310) at both ends, and an upper rotating shaft (320) is provided between the two upper mounting plates (310). The chain feed sprocket (500) is fixedly connected to the upper rotating shaft (320). The lower support frame (200) is fixedly connected to two lower mounting plates (210) at both ends, and a lower rotating shaft (220) is provided between the two lower mounting plates (210). The chain feed sprocket (500) is fixedly connected to the lower rotating shaft (220).

6. The conveyor chain replacement device for a billet feeding car according to claim 1, characterized in that, The connecting plate (700) includes a fixed connecting plate and a movable connecting plate. The vertical part (720) of the fixed connecting plate is fixedly connected to the side of the bottom fixing frame (100) away from the conveying track (900). The vertical part (720) of the movable connecting plate is detachably connected to the side of the bottom fixing frame (100) near the conveying track (900) by connecting bolts (350).

7. A conveyor chain replacement device for a billet feeding car according to claim 1, characterized in that, The output sprocket (400) and the feed sprocket (500) are staggered vertically.

8. A method for replacing a conveyor chain for a billet feeding car, wherein the method uses the conveyor chain replacement device for a billet feeding car as described in any one of claims 1-7, characterized in that, The method includes the following steps: S10: Lift the bottom fixing frame (100) onto the transverse track (800) and fix the bottom fixing frame (100) to the transverse track (800) by tightening the top bolts (730); S20: Disassemble the old chain, engage the head of the old chain with the output sprocket (400) for transmission, and at the same time connect the tail of the old chain with the head of the new chain and engage it with the feed sprocket (500) for transmission. S30: Start the drive motor (600) to drive the output sprocket (400) to rotate until the head of the new chain moves to engage with the output sprocket (400) for transmission; S40: Connect the head and tail of the new chain.

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