Closed link for small caliber projectile transmission

Abstract

In order to solve the problems of low reliability, large volume and weight, and long assembly time of the existing scheme for transmitting cannonball by adopting the chainless technology, the application provides a closed link for transmitting small-caliber cannonball, which comprises a bullet clamping groove; the bullet clamping grooves are n in number and are arranged in parallel and connected in sequence to form a closed chain structure; two adjacent bullet clamping grooves are connected by bullet tip supports, connecting plates, chain pins and bearings at one end and connected by bullet bottom supports, connecting plates, chain pins and bearings at the other end to form a bullet clamping groove of one bullet position; the connecting plate is a stepped staggered long strip plate formed by sequentially arranging a thin plate, two thick plates and three thin plates; the end of the first thin plate and the end of the third thin plate are respectively used for connecting the bullet tip support or the bullet bottom support in the adjacent bullet clamping groove; the second thick plate is used for connecting the end of the bullet clamping groove between the adjacent bullet clamping grooves; bearings are installed on the bullet tip support and the bullet bottom support for rolling the bullet clamping groove and completing the bullet transmission; the chain pin is used for axially limiting the bearings on the bullet tip support and the bullet bottom support and the connecting plate. The application has simple structure and high reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to a closed link for transporting small-caliber cannon shells. The small-caliber cannon shells referred to in the present application refer to cannon shells used in artillery with a caliber of 37 mm or less. BACKGROUND

[0002] At present, the main technologies for transporting cannon shells in domestic and foreign weapon equipment are chain technology and chainless technology. The chain technology mainly press-connects the cannon shell and the link together; the chainless technology mainly separates the cannon shell and the link easily, and the link can be used to repeatedly accommodate the cannon shell. The chain technology has been widely used, but it has the disadvantages of difficult link machining, non-reusable, complicated assembly, etc., and cannot meet the use requirements in the aspect of small-caliber high-speed artillery ammunition supply.

[0003] The chainless technology has been more widely used at home and abroad, and has shown greater advantages in actual use. The chainless technology is divided into linear chainless technology, drum-type chainless technology and spiral chainless technology.

[0004] The patent document with the application number 201318001070.5 and the name of bidirectional linear chainless closed belt discloses a typical bidirectional linear chainless closed belt technology. The main cannon shell container in this scheme is a closed belt, which is linearly connected by a series of shell holding grooves and closed at both ends. The shell holding grooves are connected with the large link plate and the small link plate through welding, which can supply ammunition to the automatic machine and orderly receive the returned cannon shells or shell cases. The disadvantage of this scheme is that the link machining is difficult, the assembly gap control is complicated, the welding quality of the shell holding grooves, the large link plate and the small link plate is affected and limited by the skill level of the workers, which makes the welding consistency of the closed belt poor and the reliability low.

[0005] The main cannon shell container in the drum-type chainless ammunition supply technology is a drum. Due to the limitations of the storage mode (the length of the shell points to the center of the circle) and the transmission mode (spiral), the drum is generally circular and has a large diameter, which makes the artillery system large in size and weight, and has a large requirement for the installation space.

[0006] The patent document with the application number 202118009252.1 and the name of spiral linear chainless ammunition supply device discloses a spiral linear chainless ammunition supply technology. This scheme can realize the arrangement of the ammunition belt in three-dimensional space, but it has the disadvantage of too many parts and time-consuming and laborious assembly. SUMMARY

[0007] In order to solve the technical problems of low reliability, large size and weight, and time-consuming and laborious assembly of the existing scheme for transmitting cannonball by adopting chainless technology, the application provides a closed link for small-caliber cannonball transmission, which adopts a ring-encircling positioning method to store the cannonball, has simple structure, few components, and the advantages of high reliability, small size, light weight, and simple assembly.

[0008] The technical scheme of the application is:

[0009] A closed link for small-caliber cannonball transmission, which is characterized in that: comprising a bullet clamping groove, a bullet tip support, a bullet bottom support, a connecting plate, a chain pin and a bearing.

[0010] The bullet clamping groove has n and is arranged in parallel, and is connected in sequence to form a closed chain structure; two adjacent bullet clamping grooves are connected in a linking manner by the bullet tip support, the connecting plate, the chain pin and the bearing at one end, and by the bullet bottom support, the connecting plate, the chain pin and the bearing at the other end, to form a bullet clamping groove of one bullet position, the cavity of the bullet clamping groove is matched with the shape and size of the cannonball to be assembled; the n bullet clamping grooves form bullet clamping grooves of n-1 bullet positions in total.

[0011] The connecting plate is a stepped staggered long strip plate formed by a thin plate, a thick plate and a thin plate arranged in sequence, and the end of the thin plate and the thin plate is a semicircular end; the thin plate and the thin plate are respectively used to connect the bullet tip support or the bullet bottom support in the adjacent bullet clamping groove, and the thick plate is used to connect the end of the bullet clamping groove between the adjacent bullet clamping grooves.

[0012] The bearing is installed on each bullet tip support and bullet bottom support, which is used to roll the bullet clamping groove and complete the bullet feeding action.

[0013] The chain pin is used to axially limit the bearing on the bullet tip support and the bullet bottom support and the connecting plate on the bullet tip support and the bullet bottom support.

[0014] Further, the bullet tip support is a three-step cylindrical stepped shaft, and a first chain pin mounting through hole for mounting the chain pin is arranged in the middle of the shaft end; the first step shaft of the bullet tip support is used to mount the bearing, the second step shaft is used to mount the connecting plate, and the third step shaft is used to limit the front and back movement of the connecting plate.

[0015] Further, the bullet bottom support is a four-step disc-shaped stepped shaft, and a second chain pin mounting through hole for mounting the chain pin is arranged in the middle of the shaft end; the first step shaft of the bullet bottom support is used to mount the bearing, the second step shaft is used to mount the connecting plate, the third step shaft is used to limit the front and back movement of the connecting plate, and the end face of the fourth step shaft is used to limit the bottom of the bullet, and a recessed accommodation platform is arranged in the middle of the end face of the fourth step shaft to ensure that the bullet primer is not contacted.

[0016] Further, the card elastic groove comprises a left elastic bottom sheet, a right elastic bottom sheet, a left positioning block and a right positioning block; the left elastic bottom sheet and the right elastic bottom sheet are in parallel butt joint, and the left positioning block and the right positioning block are respectively arranged on the left side and the right side of the combined body formed by the connection of the left elastic bottom sheet and the right elastic bottom sheet; the left positioning block in one card elastic groove and the right positioning block in the adjacent card elastic groove are used for tightly holding the cannonball.

[0017] Further, the left elastic bottom sheet is in the shape of a long strip as a whole, and from the width direction, the middle part of the left elastic bottom sheet is a horn-shaped groove with the opening size gradually decreasing from the groove top to the groove bottom; the horn-shaped groove comprises a middle flat plate and inclined plates located on both sides of the middle flat plate, and the inclined plate close to the bottom end of the cannonball can be used for positioning the cannonball; a plurality of mounting holes are arranged on the middle flat plate in intervals, among which, the mounting hole in the middle part is used as the mounting interface of the left elastic bottom sheet and the left positioning block, and the remaining mounting holes are used as the mounting interface of the left elastic bottom sheet and the right elastic bottom sheet; the groove top of the horn-shaped groove is further provided with a bending structure extending to the outside of the horn-shaped groove and bending; in the length direction, both ends of the horn-shaped groove are provided with lugs for connecting with the connecting plate, and the lugs are bent to the direction of the opening of the horn-shaped groove; the first clearance notch is further arranged on the upper side and the lower side of the left elastic bottom sheet, and is used for the operation of moving the cannonball in the closed loop.

[0018] The right elastic bottom sheet is a mirror-symmetrical piece of the left elastic bottom sheet.

[0019] The right elastic bottom sheet is arranged in the groove bottom of the left elastic bottom sheet, and the middle flat plates of the horn-shaped grooves of the two are riveted and connected.

[0020] Further, the first clearance notch on the upper side extends to the middle part of the middle flat plate from the bending structure at the upper groove top, and the first clearance notch on the lower side extends to the middle part of the middle flat plate from the bending structure at the lower groove top.

[0021] Further, the first clearance notch is a U-shaped notch.

[0022] Further, the left positioning block is an arc-shaped bent plate, and a second clearance notch is arranged in the middle part of the upper part of the arc-shaped bent plate; the middle part of the outer side wall of the arc-shaped bent plate is a horizontal plane, and the upper side and the lower side of the horizontal plane are inclined planes; the horizontal plane is matched with the middle flat plate of the horn-shaped groove on the left elastic bottom sheet, and the angles of the two inclined planes are greater than the angle of the inclined plate of the horn-shaped groove on the left elastic bottom sheet; the inner side wall of the arc-shaped bent plate is an arc surface, which is used for matching with the cannonball; a bevel shoulder is arranged at the front end of the arc surface, which is used for limiting the forward and backward movement of the cannonball; a stepped through hole is further arranged on the inner side wall of the arc-shaped bent plate, which is used as the mounting interface of the left positioning block and the left elastic bottom sheet; the second clearance notch on the upper part of the left positioning block corresponds to and matches the first clearance notch on the middle part of the upper side of the left elastic bottom sheet, and is used for moving the cannonball.

[0023] The right positioning block is a mirror-symmetrical piece of the left positioning block.

[0024] Further, the thickness of the first thin plate is equal to the sum of the thicknesses of the first thin plate and the second thin plate.

[0025] Further, working recesses are respectively arranged at the semicircular end heads of the connecting plates, the planes of the working recesses on the two end heads are on the same horizontal plane, and the lengths of the working recesses on the two end heads are greater than the diameters of the semicircular end heads, so that the two connecting plates can be randomly rotated without interference after being misaligned.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] 1. The present application can realize bidirectional linear transmission of cannonballs, and can supply cannonballs to an automatic machine when rotating in the forward direction and can eject unshot cannonballs when rotating in the reverse direction.

[0028] 2. The present application uses inclined plates and positioning blocks to implement ring-shaped positioning of cannonballs, can realize reliable positioning of cannonballs in a cartridge case and random arrangement of closed links, has simple structure, small number of parts, and is convenient to assemble and use, thereby reducing the energy consumption of a gun.

[0029] 3. The main parts in the present application are castings and stamping parts, have small volume and light weight, are simple to process, and are suitable for mass production and low-cost production. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic view of a closed link for transmission of small-caliber cannonballs according to an embodiment of the present application.

[0031] Figure 2 is a structural schematic view of a combined cannonball ejection groove. Fig. a) is a front view, Fig. b) is a top view, and Fig. c) is a right view.

[0032] Figure 3 is a structural schematic view of a left cannonball base plate.

[0033] Figure 4 is a structural schematic view of a right cannonball base plate.

[0034] Figure 5 is an installation schematic view of a cannonball tip supporting portion. Fig. a) is a structural schematic view of a cannonball tip support, Fig. b) is an assembly schematic view of the cannonball tip supporting portion, and Fig. c) is an installation schematic view of two connecting plates at the cannonball tip supporting portion.

[0035] Figure 6 is an installation schematic view of a cannonball base supporting portion. Fig. a) is a structural schematic view of a cannonball base support, Fig. b) is an assembly schematic view of the cannonball base supporting portion, and Fig. c) is an installation schematic view of two connecting plates at the cannonball base supporting portion.

[0036] Figure 7 is a structural schematic view of a left positioning block.

[0037] Figure 8 is the structural diagram of the right positioning block.

[0038] Figure 9 is the structural diagram of the chain pin.

[0039] Figure 10 is the structural diagram of the connecting plate.

[0040] Figure 11 is the use state diagram of the closed chain link for small caliber cannonball transmission.

[0041] Reference signs: 1-left bottom shell piece, 101-horn-shaped groove, 1011-middle flat plate, 1012-inclined plate, 1013-mounting hole, 102-bent structure, 103-ear, 104-first gap, 2-right bottom shell piece, 3-shell tip holder, 301-first stage shaft, 302-second stage shaft, 303-third stage shaft, 304-first chain pin mounting through hole, 4-bottom shell holder, 401-first stage shaft, 402-second stage shaft, 403-third stage shaft, 404-fourth stage shaft, 405-second chain pin mounting through hole, 406-gapping table, 5-left positioning block, 501-horizontal surface, 502-inclined surface, 503-arc surface, 504-step through hole, 505-second gap, 506-inclined shoulder, 6-right positioning block, 7-connecting plate, 701-working recess, 702-mounting shaft hole, 703-long rivet mounting hole, 8-chain pin, 9-bearing, 10-long rivet, 11-short rivet, 12-chain wheel. DETAILED DESCRIPTION

[0042] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0043] Referring to Figure 1 , the closed chain link for small caliber cannonball transmission provided by the embodiment includes a shell clamping groove, a shell tip holder 3, a bottom shell holder 4, a connecting plate 7, a chain pin 8, a bearing 9, a long rivet 10, and a short rivet 11.

[0044] Referring to Figures 2-4 , the shell clamping groove includes a left bottom shell piece 1, a right bottom shell piece 2, a left positioning block 5, and a right positioning block 6. The left bottom shell piece 1 is in parallel butt joint with the right bottom shell piece 2, and the left positioning block 5 and the right positioning block 6 are respectively arranged on the left and right sides of the combined body formed by the connection of the left bottom shell piece 1 and the right bottom shell piece 2. The outer shape of the shell clamping groove looks like an elongated “X shape” from the longitudinal direction and looks like a “butterfly shape” from the lateral direction.

[0045] Referring to Figure 3, the left shell bottom sheet 1 is in a long strip shape, and the middle part of the left shell bottom sheet 1 is a horn-shaped slot 101 with a gradually decreasing opening size from the top to the bottom of the slot in the width direction of the left shell bottom sheet 1; the horn-shaped slot 101 comprises a middle flat plate 1011 and inclined plates 1012 located on both sides of the middle flat plate; the inclined plates 1012 close to the shell bottom end can be used for positioning the shell; a plurality of mounting holes 1013 are arranged on the middle flat plate 1011 at intervals, among which, the mounting holes 1013 located in the middle serve as the mounting interface of the left shell bottom sheet 1 and the left positioning block 5, and the remaining mounting holes 1013 serve as the mounting interface of the left shell bottom sheet 1 and the right shell bottom sheet 2; the top of the horn-shaped slot 101 is further provided with a bending structure 102 extending outward and bending from the horn-shaped slot 101; in the length direction, both ends of the horn-shaped slot 101 are provided with lugs 103 for connecting with the connecting plate 7, and the lugs 103 are bent towards the slot opening direction of the horn-shaped slot 101. In addition, first displacement notches 104 are further provided on the upper side and the lower side of the left shell bottom sheet 1, for the operation of moving the shell in the closed loop; the first displacement notch 104 located on the upper side extends from the bending structure 102 at the upper side to the middle part of the middle flat plate 1011, and the first displacement notch 104 located on the lower side extends from the bending structure 102 at the lower side to the middle part of the middle flat plate 1011; the first displacement notches 104 in the embodiment are U-shaped notches, and there are two displacement notches on the upper side and one displacement notch on the lower side, and the depths and lengths of the three displacement notches are the same.

[0046] With reference to Figure 4 and Figure 2 , the right shell bottom sheet 2 is a mirror-symmetrical piece of the left shell bottom sheet 1.

[0047] With reference to Figure 7 , the left positioning block 5 is an arc-shaped bent plate, and a second displacement notch 505 is arranged in the middle of the upper part of the arc-shaped bent plate. The middle part of the outer side wall of the left positioning block 5 is a horizontal plane 501, and the upper and lower sides of the horizontal plane 501 are inclined planes 502. The horizontal plane 501 cooperates with the middle flat plate 1011 of the horn-shaped slot 101 on the left shell bottom sheet 1, and the angles of the inclined planes 502 on both sides are greater than the angle of the inclined plates 1012 of the horn-shaped slot 101 on the left shell bottom sheet 1. The inner side wall of the left positioning block 5 is an arc surface 503 for cooperating with the shell; a bevel shoulder 506 is arranged at the front end of the arc surface 503, for limiting the forward and backward movement of the shell. A stepped through hole 504 is arranged on the inner side wall of the left positioning block 5, which serves as the mounting interface of the left positioning block 5 and the left shell bottom sheet 1. The second displacement notch 505 on the upper part of the left positioning block 5 corresponds to the first displacement notch 104 on the upper middle part of the left shell bottom sheet 1, for moving and moving the shell, and the shape and size of the second displacement notch 505 and the corresponding first displacement notch 104 are matched. In the embodiment, the second displacement notch 505 is a U-shaped notch.

[0048] With reference to Figure 8The right positioning block 6 is a mirror-symmetrical part of the left positioning block 5.

[0049] Referring to Figure 2 The left elastic base 1 and the right elastic base 2 are arranged in a slot-to-slot manner. The middle plate 1011 of the trumpet-shaped slot 101 of the left elastic base 1 is connected to the middle plate of the trumpet-shaped slot of the right elastic base 2 at the mounting hole 1013 by a short rivet 11. After the connection, riveting is needed to be expanded, and axial stringing is not allowed. The left positioning block 5 and the right positioning block 6 are arranged on the two sides of the left elastic base 1 and the right elastic base 2 combination respectively and are located at the middle part of the left elastic base 1 and the right elastic base 2 combination in the longitudinal direction. The left positioning block 5 and the right positioning block 6 are fixed at the mounting hole 1013 of the middle part of the corresponding elastic base by a long rivet 10. The horizontal surface 501 of the middle part of the outer side wall of the left positioning block 5 is butted and connected to the middle plate 1011 of the left elastic base 1. The horizontal surface of the middle part of the outer side wall of the right positioning block 6 is butted and connected to the middle plate of the right elastic base 2. The second gap 505 on the left positioning block 5 is basically aligned with the first gap 104 on the upper middle part of the left elastic base 1. The second gap on the right positioning block 6 is basically aligned with the first gap on the upper middle part of the right elastic base 2. Similarly, after the left positioning block 5 is connected to the left elastic base 1 and the right positioning block 6 is connected to the right elastic base 2, riveting needs to be expanded, and axial stringing is not allowed.

[0050] Referring to Figure 1 The card elastic slot has n, and the n card elastic slots are arranged in parallel. Adjacent two card elastic slots are connected in a linking manner by a connecting plate 7, a bullet tip support 3, a bearing 9 and a chain pin 8 at one end and by a connecting plate 7, a bullet base support 4, a bearing 9 and a chain pin 8 at the other end. Finally, the n card elastic slots are connected in sequence to form a closed chain structure (the chain distance t depends on the distance between the shaft hole installation positions of the two semicircular end heads on the connecting plate 7). Adjacent two card elastic slots can form a bullet holding slot of one bullet position, that is, a bullet holding slot that can just accommodate one cannonball. The n card elastic slots form n-1 bullet holding slots in total. The shape and size of the bullet holding slot are adapted to the shape and size of the to-be-mounted cannonball. Each bullet holding slot has a bullet tip support 3 and a bullet base support 4. The area close to the bullet tip support 3 in the bullet holding slot is a bullet head accommodating end, and the area close to the bullet base support 4 is a bullet base accommodating end. The arc surface 503 on the inner side of the left positioning block 5 in a card elastic slot and the arc surface on the inner side of the right positioning block 6 in the adjacent card elastic slot form a hole whose size is adapted to the external size of the cannonball at this position. The cannonball is axially limited by the inclined shoulder 506 on the left positioning block 5 and the inclined shoulder on the right positioning block 6, and is reliably positioned in cooperation with the bullet base support 4.

[0051] Referring to Figure 5, the elastic tip holder 3 is a three-step cylindrical stepped shaft, and a first chain pin mounting hole 304 is arranged in the middle of the shaft end. The first step shaft 301 is used to install the bearing 9, the second step shaft 302 is used to install the connecting plate 7, and the third step shaft 303 is used to limit the front and back movement of the connecting plate 7. During installation, the two clamping grooves are arranged horizontally, the connecting holes of the two connecting plates 7 are aligned and then installed in the second step shaft 302 of the elastic tip holder 3, then the bearing 9 is installed in the first step shaft 301 of the elastic tip holder 3, and finally the chain pin 8 is installed in the first step shaft 301 end to the first chain pin mounting hole 304, the expanded hole of the chain pin 8 is expanded and riveted, and the axial movement is prevented.

[0052] Referring to Figure 6 , the elastic bottom holder 4 is a four-step disc-shaped stepped shaft, and a second chain pin mounting hole 405 is arranged in the middle of the shaft end. The first step shaft 401 is used to install the bearing 9, the second step shaft 402 is used to install the connecting plate 7, the third step shaft 403 is used to limit the front and back movement of the connecting plate 7, and the end face of the fourth step shaft 404 is used to limit the bottom of the projectile. A concave accommodation platform 406 is arranged in the middle of the end face of the fourth step shaft 404 to ensure that it does not contact the primer of the shell. During installation, the two clamping grooves are arranged horizontally, the connecting holes of the two connecting plates 7 are aligned and then installed in the second step shaft 402 of the elastic bottom holder 4, then the bearing 9 is installed in the first step shaft 401 of the elastic bottom holder 4, and finally the chain pin 8 is installed in the first step shaft 401 end to the second chain pin mounting hole 405, the expanded hole of the chain pin 8 is expanded and riveted, and the axial movement is prevented.

[0053] Referring to Figure 10The connecting plate 7 is a stepped staggered long strip formed by a first thin plate, a second thick plate and a third thin plate arranged in sequence, and the two ends of the connecting plate 7 are semicircular; the first thin plate and the third thin plate are respectively used for connecting the bullet tip support or the bullet bottom support in the adjacent bullet holding groove, and the second thick plate is used for connecting the end of the bullet clamping groove between the adjacent bullet holding grooves. The first thin plate and the third thin plate are equal in thickness, and the thickness of the second thick plate is equal to the sum of the thicknesses of the first thin plate and the second thick plate. A working recess 701 is arranged at the semicircular end, and the planes of the working recesses 701 on the two ends are on the same horizontal plane, and the lengths of the working recesses 701 on the two ends should be greater than the diameter at the semicircular end, so that the two connecting plates can be randomly rotated after staggered installation without interference. An installation shaft hole 702 is further arranged at the semicircular end, which is used for cooperation with the bullet bottom support 4 or the bullet tip support 3. A stepped long rivet installation hole 703 matching the supporting ears 103 on the left bullet bottom sheet 1 and the supporting ears on the right bullet bottom sheet 2 is arranged on the second thick plate of the connecting plate 7, and the long rivet installation hole 703 serves as the installation interface of the connecting plate 7 and the left bullet bottom sheet 1 and the right bullet bottom sheet 2. When the connecting plate 7 and the left bullet bottom sheet 1 and the right bullet bottom sheet 2 are combined to form the bullet clamping groove, the long rivet installation hole 703 on the second thick plate of the connecting plate 7 is aligned with the installation hole of the supporting ear on the bullet clamping groove, and then a long rivet 10 is installed therein, and after connection, riveting is expanded to prevent axial movement. In order to facilitate operation, the tapered face installation hole on the connecting plate 7 faces outward.

[0054] With reference to Figure 5 , Figure 9 The chain pin 8 is a flat head-shaped half hollow shaft, the hollow end is used for expanding rivet fixing with the bullet bottom support 4 or the bullet tip support 3, and the end face of the flat head end is used for fixing the inner ring of the bearing 9.

[0055] The bearing 9 is a standard part, which can be a deep groove ball bearing with dust covers at both ends, and one bearing 9 is installed at the bullet bottom support 4 and the bullet tip support 3 corresponding to one bullet holding groove, which is used to make the bullet clamping groove roll to complete the bullet feeding action.

[0056] The principle and working process of the invention for transmitting cannonball are as follows:

[0057] With reference to Figure 2 The left bullet bottom sheet 1, the right bullet bottom sheet 2, the left positioning block 5 and the right positioning block 6 are connected in sequence by the long rivet 10 and the short rivet 11 to form one bullet clamping groove, and the bullet clamping groove is connected with the connecting plate 7 on both sides through the long rivet 10, and n bullet clamping grooves are assembled according to this method. The n bullet clamping grooves are arranged in sequence, and the bullet tip end and the bullet bottom end are respectively Figure 5 , Figure 6 The n bullet clamping grooves are connected, and finally connected in a closed link.

[0058] With reference to Figure 11In the working process, the sprocket 12 is arranged at the turning position of the chain link in the present application, and the sprocket 12 is driven to rotate by the driving mechanism, so as to drive the bearings 9 on both sides of the chain link, realize the movement of the whole closed chain link and the reliable transmission of the cannonball. The sprocket 12 and the corresponding driving mechanism are both mature units.

Claims

1. A closed link for small caliber projectile transportation, characterized by: The card bullet slot, bullet tip support, bullet bottom support, connecting plate, chain pin and bearing are included. The card bullet slot has n and is parallelly arranged, sequentially connected to form a closed chain structure; two adjacent card bullet slots are connected in a linking manner by the bullet tip support, connecting plate, chain pin and bearing at one end and connected in a linking manner by the bullet bottom support, connecting plate, chain pin and bearing at the other end to form a bullet holding slot of one bullet position, the cavity of the bullet holding slot is matched with the shape and size of the to-be-loaded cannonball; the n card bullet slots form bullet holding slots of n-1 bullet positions. The connecting plate is a stepped staggered long strip plate formed by sequentially arranging a thin plate, two thick plates and three thin plates, and the end of the thin plate and the three thin plates are semicircular end heads; the thin plate and the three thin plates are respectively used for connecting the bullet tip support or the bullet bottom support in the adjacent bullet holding slot, and the two thick plates are used for connecting the end of the card bullet slot between the adjacent bullet holding slots. The bearing is installed on each bullet tip support and bullet bottom support to make the card bullet slot roll and complete the bullet feeding action. The chain pin is used for axially limiting the bearing on the bullet tip support and the bullet bottom support and the connecting plate on the bullet tip support and the bullet bottom support. The bullet tip support is a three-step cylindrical stepped shaft, and a first chain pin mounting through hole for mounting the chain pin is arranged at the middle of the shaft end; the first step shaft of the bullet tip support is used for mounting the bearing, the second step shaft is used for mounting the connecting plate, and the third step shaft is used for limiting to prevent the front and back movement of the connecting plate. The bullet bottom support is a four-step disc-shaped stepped shaft, and a second chain pin mounting through hole for mounting the chain pin is arranged at the middle of the shaft end; the first step shaft of the bullet bottom support is used for mounting the bearing, the second step shaft is used for mounting the connecting plate, the third step shaft is used for limiting to prevent the front and back movement of the connecting plate, and the end face of the fourth step shaft is used for limiting the bottom of the bullet, and a concave accommodation platform is arranged at the middle of the end face of the fourth step shaft to ensure that the bullet primer is not contacted.

2. The closed link for small caliber projectile transmission according to claim 1, characterized in that: The card bullet slot includes a left bullet bottom sheet, a right bullet bottom sheet, a left positioning block and a right positioning block; the left bullet bottom sheet and the right bullet bottom sheet are parallelly butted, and the left positioning block and the right positioning block are respectively arranged on the left and right sides of the combined body formed by connecting the left bullet bottom sheet and the right bullet bottom sheet; the left positioning block in one card bullet slot and the right positioning block in the adjacent card bullet slot are used for holding the cannonball.

3. The closed link for small caliber projectile transportation according to claim 2, characterized in that: The left bullet bottom sheet is in a long strip shape, and the middle part of the left bullet bottom sheet is a horn-shaped slot with a gradually decreasing opening size from the top to the bottom of the slot in the width direction of the left bullet bottom sheet; the horn-shaped slot includes a middle plate and inclined plates located on both sides of the middle plate, and the inclined plate close to the bullet bottom end can be used for positioning the cannonball; a plurality of mounting holes are arranged on the middle plate in an interval, among the mounting holes, the mounting hole in the middle is used as a mounting interface of the left bullet bottom sheet and the left positioning block, and the remaining mounting holes are used as mounting interfaces of the left bullet bottom sheet and the right bullet bottom sheet; the top of the horn-shaped slot is further provided with a bending structure extending outward and bending of the horn-shaped slot; in the length direction, both ends of the horn-shaped slot are provided with lugs for connecting the connecting plate, and the lugs are bent to the direction of the slot opening of the horn-shaped slot; first accommodation notches are further arranged on the upper side and the lower side of the left bullet bottom sheet to move the cannonball in the closed loop. The right bullet bottom sheet is a mirror image of the left bullet bottom sheet. The right elastic base and the left elastic base are arranged in a slot-to-slot bottom mode, and the middle plates of the trumpet-shaped slots of the two are riveted and connected.

4. The closed link for small caliber projectile transportation according to claim 3, characterized in that: The first clearance notch on the upper side extends from the bending structure at the upper slot top to the middle of the middle plate, and the first clearance notch on the lower side extends from the bending structure at the lower slot top to the middle of the middle plate.

5. The closed link for small caliber projectile transportation according to claim 4, characterized in that: The first clearance notch is a U-shaped notch.

6. The closed link for small caliber projectile transportation according to claim 2, characterized in that: The left positioning block is an arc-shaped bent plate, and a second clearance notch is arranged at the upper middle part of the arc-shaped bent plate; the middle part of the outer side wall of the arc-shaped bent plate is a horizontal plane, and the upper and lower sides of the horizontal plane are inclined surfaces; the horizontal plane is matched with the middle plate of the upper trumpet-shaped slot of the left elastic base, and the angles of the inclined surfaces on the two sides are greater than the angle of the inclined plate of the upper trumpet-shaped slot of the left elastic base; the inner side wall of the arc-shaped bent plate is an arc surface for cooperating with the cannonball; a beveled shoulder is arranged at the front end of the arc surface to limit the front and back movement of the cannonball; the inner side wall of the arc-shaped bent plate is further provided with a stepped through hole, which serves as the mounting interface of the left positioning block and the left elastic base; the second clearance notch at the upper part of the left positioning block corresponds to and matches the first clearance notch at the upper middle part of the left elastic base, and is used for giving way to the cannonball; The right positioning block is a mirror-symmetrical part of the left positioning block.

7. The closed link for small caliber projectile transportation according to claim 1, characterized in that: The length of the one thin plate of the connecting plate is equal to the length of the three thin plates, and the thickness of the two thick plates is equal to the sum of the thicknesses of the one thin plate and the two thin plates.

8. The closed link for small caliber projectile transportation according to claim 7, characterized in that: Working recesses are arranged at the semicircular end heads of the connecting plates respectively, and the planes of the working recesses on the two end heads are on the same horizontal plane, and the lengths of the working recesses on the two end heads are greater than the diameters of the semicircular end heads, so that the two connecting plates can be randomly rotated without interference after being installed in a staggered manner.

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