A feed crushing device

Abstract

The utility model discloses a feed crushing device, the utility model relates to feed processing technical field, scheme includes: a kind of feed crushing device, including: rack;Crushing shell, crushing shell is installed on rack, the top end of crushing shell is equipped with feed inlet, the bottom end of crushing shell is equipped with discharge port, the both sides of crushing shell are respectively equipped with mounting interface;Two crushing rollers, two crushing rollers are respectively rotationally assembled in crushing shell, and crushing channel is formed between two crushing rollers;Driving assembly, driving assembly can drive two crushing rollers to rotate towards each other;Two cleaning assemblies, two cleaning assemblies are set up one by one with two mounting interfaces, and cleaning assembly is installed at corresponding mounting interface;Efficient cleaning of the high efficient cleaning of the surface of crushing roller adhering feed can be realized, and the quality and health safety of feed processing are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of feed processing technology, specifically to a feed crushing device. Background Technology

[0002] Feed processing quality directly impacts breeding efficiency and animal health, and raw material crushing is an indispensable key process in feed processing. Basic raw materials such as grains and oilseed meals often remain in large pieces after harvesting and storage, and may contain impurities. Direct feeding of these materials is difficult for animals to digest and absorb, leading to feed waste and even health risks due to moldy particles. Furthermore, the digestive abilities of farmed animals at different growth stages (such as piglets and finishing pigs) vary, requiring different feed particle sizes. Overly coarse particles increase the digestive burden, necessitating the crushing process to control particle shape. Crushed raw materials have increased surface area, improving the digestibility and utilization of nutrients and laying the foundation for subsequent mixing and pelleting processes, ensuring a uniform nutrient ratio in the feed.

[0003] According to the authorization announcement number (CN222789344U), a crushing device for feed processing is disclosed. A housing is mounted on a frame, and a discharge control structure is installed at the bottom of the housing. A crushing structure and a filtering structure are installed inside the housing. During actual crushing operations, the first and second crushing rollers rotate synchronously in opposite directions. By applying compression, shearing, and grinding actions to the feed raw materials, the raw materials are crushed and mixed, ultimately forming a feed product that meets processing requirements.

[0004] The structure disclosed in this patent has defects in practical applications, specifically as follows: After prolonged crushing operations, feed tends to adhere and accumulate on the surfaces of the first and second crushing rollers, especially starchy grains such as corn and sorghum, and protein-rich feeds such as soybean meal and rapeseed meal. Furthermore, since the first and second crushing rollers are housed within the machine casing, operators must reach into the equipment through a narrow feed inlet to clean them. This not only severely restricts the operating space but also makes it easy for the rollers to interfere with internal components, making it difficult to thoroughly remove the adhering feed residue. Long-term accumulation can also lead to mold growth in the raw materials, directly affecting the quality of subsequent feed processing. Utility Model Content

[0005] The purpose of this invention is to provide a feed crushing device that addresses the problem in the prior art where starchy and protein-containing feeds easily adhere to the surface of the crushing roller, making it difficult to completely remove the adhering feed residue. This device provides a solution to the problem of efficient cleaning of feed adhering to the surface of the crushing roller, ensuring the quality and hygiene safety of the processed feed.

[0006] This utility model is achieved through the following technical solution:

[0007] A feed crushing device includes: a frame; a crushing shell mounted on the frame, with a feed port at the top and a discharge port at the bottom, and mounting interfaces on both sides; two crushing rollers rotatably mounted inside the crushing shell, forming a crushing channel between them; a drive assembly capable of driving the two crushing rollers to rotate in opposite directions; and two cleaning assemblies corresponding to the two mounting interfaces, each installed at a specific mounting interface. In the cleaning state, each cleaning assembly extends at least partially into the crushing shell, forming a preset distance with the corresponding crushing roller. In the crushing state, the cleaning assemblies detach from the crushing shell, sealing the mounting interfaces.

[0008] Furthermore, in this utility model, the cleaning component includes: a mounting base, the mounting base having a through guide slide, the guide slide being connected and adapted to the mounting interface; a cleaning scraper, the cleaning scraper being slidably assembled within the guide slide; wherein, in the cleaning state, the cleaning scraper can be locked to a first position, the cleaning scraper forming a preset distance with the corresponding crushing roller; in the crushing state, the cleaning scraper can be locked to a second position, the cleaning scraper being able to disengage from the inside of the crushing housing to block the mounting interface.

[0009] Furthermore, in this utility model, the mounting base is provided with a travel groove communicating with the guide slide along a preset direction, and the length of the travel groove is adapted to the preset sliding stroke of the cleaning scraper; an operating lever is installed on the cleaning scraper, the operating lever passes through the travel groove, and the operating lever can slide along the extension direction of the travel groove.

[0010] Furthermore, in this utility model, the above also includes a locking pin; the side wall of the cleaning scraper is provided with a positioning through hole; the side wall of the mounting base is provided with a breaking lock hole and a cleaning lock hole from top to bottom; wherein, in the cleaning state, the cleaning scraper moves to the first position, and the locking pin passes through the cleaning lock hole and the positioning through hole in sequence; in the breaking state, the cleaning scraper moves to the second position, and the locking pin passes through the breaking lock hole and the positioning through hole in sequence.

[0011] Furthermore, in this utility model, the cleaning scraper is provided with a receiving groove at the end near the crushing roller, and a cleaning abutment is slidably assembled in the receiving groove; a first elastic member is provided in the receiving groove, one end of the first elastic member is connected to the inner wall of the receiving groove, and the other end of the first elastic member is connected to the cleaning abutment.

[0012] Furthermore, in this utility model, the end of the cleaning seat away from the first elastic member is provided with a plurality of assembly channels in sequence along the extension direction; a cleaning scraper is slidably assembled in the assembly channel, and a second elastic member is provided in the assembly channel, one end of the second elastic member is connected to the inner wall of the assembly channel, and the other end of the second elastic member is connected to the cleaning scraper.

[0013] Furthermore, in this utility model, each of the above-mentioned crushing rollers is equipped with a drive shaft at its end. The drive shaft passes through the crushing shell and extends to the outside of the crushing shell. A drive gear is fixedly mounted on the drive shaft. The drive gears corresponding to the two crushing rollers mesh with each other, thereby realizing that the two crushing rollers rotate synchronously in opposite directions.

[0014] Furthermore, in this utility model, the aforementioned drive assembly includes: a motor mounted on a frame; a first sprocket assembled on the output shaft of the motor; a second sprocket assembled on one of the drive shafts; and a drive chain fitted onto the first sprocket and the second sprocket, the drive chain engaging with the first sprocket and the second sprocket respectively.

[0015] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0016] 1. The cleaning component of this utility model adopts a dual-state switchable structure. By sliding the cleaning scraper along the guide slide, it realizes the function of extending into the crushing shell to scrape off the residual material and detaching from the shell to seal the installation interface. It avoids the problem of incomplete removal of residual material caused by the limited operating space due to the need to disassemble the machine body or extend into the interior for cleaning from the narrow feed port in traditional crushing equipment. It significantly ensures the cleanliness of the crushing roller surface, avoids the contamination of subsequent feed by moldy residual material from the source, and improves the hygiene and safety of processing.

[0017] 2. This utility model uses a first elastic element to drive the cleaning abutment to elastically abut against the crushing roller. Combined with the one-to-one matching design of multiple independent cleaning scrapers at the end of the cleaning abutment and the second elastic element, it achieves double-layer adaptive contact between the cleaning structure and the roller surface. It avoids the defects of traditional rigid cleaning structures that are prone to roller surface damage due to rigid contact with the roller, and the poor adaptability to uneven wear or eccentric operation conditions of the crushing roller, resulting in cleaning dead corners. It significantly improves the thoroughness of residual material removal and the adaptability of equipment operating conditions. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 A perspective view of a feed crushing device;

[0020] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0021] Figure 3 A bottom view of a feed crushing device;

[0022] Figure 4 A cross-sectional view of the cleaning scraper;

[0023] Figure 5 This is a cross-sectional view of a feed crushing device.

[0024] The attached diagram shows the markings and corresponding component names:

[0025] 1-Frame, 2-Crushing shell, 3-Feed port, 4-Mounting base, 5-Cleaning scraper, 6-Stroke chute, 7-Operating lever, 8-Transmission gear, 9-Transmission shaft, 10-Second sprocket, 11-Transmission chain, 12-First sprocket, 13-Motor, 14-Cleaning lock hole, 15-Crushing lock hole, 16-Locking pin, 17-Discharge port, 18-Crushing roller, 19-Accommodation channel, 20-First elastic element, 21-Cleaning abutment, 22-Assembly channel, 23-Second elastic element, 24-Cleaning scraper head, 25-Positioning through hole, 26-Mounting interface, 27-Guide chute. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0027] Example

[0028] Please refer to Figures 1 to 5 This utility model provides a feed crushing device. It includes a frame 1, a crushing shell 2, two crushing rollers 18, a drive assembly, and two cleaning assemblies. The crushing shell 2 is fixedly mounted on the frame 1. A feed port 3 is located at the top of the crushing shell 2, and a discharge port 17 is located at the bottom. Installation interfaces 26 are located on both sides of the crushing shell 2. The two crushing rollers 18 are rotatably mounted inside the crushing shell 2, forming a crushing channel between them for feed to pass through. The drive assembly drives the two crushing rollers 18 to rotate in opposite directions. The two cleaning assemblies are correspondingly installed at the corresponding installation interfaces 26.

[0029] During the crushing operation, the operator puts the feed to be crushed into the crushing shell 2 through the feed port 3. The feed falls into the crushing channel under the action of gravity and then enters between the two crushing rollers 18. At this time, the drive component starts and drives the two crushing rollers 18 to rotate in opposite directions. The feed is crushed by the synergistic action of shearing and crushing. The crushed feed is discharged through the discharge port 17 and collected.

[0030] Two mounting interfaces 26 are respectively positioned directly above the two crushing rollers 18. When cleaning the crushing rollers 18 is required, the operator controls the actuating end of the cleaning component to extend through the mounting interface 26 into the crushing housing 2, maintaining a preset distance between the actuating end of the cleaning component and the outer circumference of the corresponding crushing roller 18. Subsequently, the operator controls the drive component to rotate the two crushing rollers 18 at a low speed. When the residual material adhering to the surface of the crushing rollers 18 rotates to the position of the cleaning component, it is scraped off the roller surface by the cleaning component, thus cleaning the residual material. After the cleaning operation is completed, the operator controls the actuating end of the cleaning component to detach from the interior of the crushing housing 2, move it to the port of the mounting interface 26, and seal the mounting interface 26, effectively preventing material from spilling out of the mounting interface 26 during the crushing operation.

[0031] In some embodiments of this application, the cleaning assembly includes a mounting base 4 and a cleaning scraper 5. The mounting base 4 is fixedly mounted to the mounting interface 26 of the crushed housing 2. A through guide slide 27 is provided inside the mounting base 4, and the guide slide 27 is in a connected and adapted state with the mounting interface 26 to ensure that the sliding path of the cleaning scraper 5 corresponds to the mounting interface 26. The cleaning scraper 5 is slidably mounted in the guide slide 27, and the cleaning scraper 5 can slide back and forth along the extension direction of the guide slide 27.

[0032] In the cleaning state, the cleaning scraper 5 can be locked to the first position. At this time, the actuating end of the cleaning scraper 5 extends into the crushing housing 2 and forms a preset distance with the outer peripheral surface of the corresponding crushing roller 18, providing suitable conditions for scraping off residual material. In the crushing state, the cleaning scraper 5 can be locked to the second position. At this time, the actuating end of the cleaning scraper 5 is completely detached from the inside of the crushing housing 2, and the corresponding end face of the cleaning scraper 5 is in contact with the port of the installation interface 26, thereby sealing the installation interface 26 and preventing material leakage during crushing operations.

[0033] Please refer to Figure 1For example, the mounting base 4 has a travel groove 6 connected to the guide slide 27 along a preset direction. The length of the travel groove 6 is adapted to the preset sliding stroke of the cleaning scraper 5 to limit the sliding range of the cleaning scraper 5. An operating lever 7 is fixedly installed on the cleaning scraper 5. The end of the operating lever 7 away from the cleaning scraper 5 passes through the travel groove 6 and extends to the outside of the mounting base 4. The operating lever 7 can slide back and forth along the extension direction of the travel groove 6. When the operator switches the working state of the device, he can move the operating lever 7 on the outside to drive the cleaning scraper 5 to move up and down synchronously along the guide slide 27, thereby realizing the rapid switching of the cleaning scraper 5 between the first position and the second position.

[0034] Please refer to Figure 2 and Figure 4 The cleaning scraper 5 has a positioning through hole 25 on its side wall, and the mounting base 4 has a breaking lock hole 15 and a cleaning lock hole 14 on its side wall from top to bottom. The diameters of the breaking lock hole 15 and the cleaning lock hole 14 are matched with the positioning through hole 25. At the same time, the locking pin 16 and the positioning through hole 25 can be designed with a threaded fit to ensure that the structure is stable after locking.

[0035] When switching to the cleaning state, the operator moves the cleaning scraper 5 along the guide slide 27 to the first position using the operating lever 7. At this time, the positioning through hole 25 on the cleaning scraper 5 is aligned with the cleaning lock hole 14 on the mounting base 4. The locking pin 16 is then screwed into the cleaning lock hole 14 and the positioning through hole 25 in sequence to lock the cleaning scraper 5 in the first position. When switching to the crushing state, the locking pin 16 is unscrewed and the cleaning scraper 5 is moved to the second position, aligning the positioning through hole 25 with the crushing lock hole 15. The locking pin 16 is then screwed into the crushing lock hole 15 and the positioning through hole 25 in sequence to lock the cleaning scraper 5 in the second position. The entire locking process is simple to operate and precise in positioning, effectively ensuring the positional stability of the cleaning scraper 5 under different working conditions.

[0036] Please refer to Figure 4 In some embodiments of this application, the cleaning scraper 5 is provided with a receiving groove 19 at the end near the crushing roller 18, and the cleaning abutment 21 is slidably assembled in the receiving groove 19. A first elastic member 20 (spring) is also provided in the receiving groove 19. One end of the first elastic member 20 is connected to the inner wall of the receiving groove 19, and the other end is connected to the cleaning abutment 21.

[0037] Under the pre-tightening force of the first elastic element 20, the cleaning abutment 21 can partially extend out of the receiving groove 19, so that the cleaning abutment 21 can elastically abut against the outer peripheral surface of the crushing roller 18 during the cleaning operation. On the one hand, the elastic buffer can avoid direct rigid contact between the cleaning abutment 21 and the crushing roller 18, preventing damage to the surface of the crushing roller 18, and at the same time, it can eliminate the gap between the cleaning abutment 21 and the crushing roller 18, ensuring the scraping effect of the residual material on the surface of the crushing roller 18; on the other hand, it has good adaptive compensation capability. When the surface of the crushing roller 18 becomes uneven due to long-term use, or when it becomes eccentric due to assembly and operation, the first elastic element 20 can drive the cleaning abutment 21 to fit against the surface of the crushing roller 18 in real time through its own deformation, always maintaining a stable cleaning state and effectively adapting to the working conditions of the crushing roller 18.

[0038] It should be noted that, in order to avoid the first elastic element 20 being affected by feed residue or impurities during operation and thus affecting its elastic performance, a sealed protective structure can be adopted. Firstly, the mating surfaces of the cleaning seat 21 and the receiving channel 19 form a mechanical seal to prevent feed impurities from entering the receiving channel 19. Secondly, a telescopic protective sleeve can be fitted on the outside of the first elastic element 20, with both ends of the telescopic protective sleeve being fixedly connected to the inner wall of the receiving channel 19 and the cleaning seat 21, respectively.

[0039] Please refer to Figure 4 In some embodiments of this application, the end of the cleaning seat 21 away from the first elastic member 20 is provided with a plurality of assembly slots 22 along its own extension direction. Each assembly slot 22 is slidably fitted with a cleaning scraper head 24. A second elastic member 23 (spring) is correspondingly provided in each assembly slot 22. One end of the second elastic member 23 is connected to the inner wall of the assembly slot 22, and the other end is connected to the corresponding cleaning scraper head 24. Under the pre-tightening action of the second elastic member 23, the ends of all cleaning scrapers 24 away from the second elastic member 23 can maintain contact with the outer peripheral surface of the crushing roller 18. The plurality of cleaning scrapers 24 are continuously arranged along the axial direction of the crushing roller 18 to form a complete scraping surface to cover the surface of the crushing roller 18.

[0040] Considering that the crushing roller 18 is subjected to shearing and crushing action for a long time, the surface is prone to local unevenness due to wear or slight deformation due to material impact. The multiple cleaning scrapers 24 independently set in this structure can solve this problem in a targeted manner: each cleaning scraper 24 is elastically supported by an independent second elastic element 23. When an uneven area appears on the surface of the crushing roller 18, the corresponding cleaning scraper 24 can be individually adjusted for extension and retraction under the deformation of the second elastic element 23, always conforming to the contour change of the roller surface; and the continuous arrangement of the structure design can ensure that the scraping area of ​​each cleaning scraper 24 is seamlessly connected, avoiding cleaning dead corners caused by the adjustment of a single scraper.

[0041] The protective measures for the second elastic element 23 can adopt the same protective structure as the first elastic element 20. Specifically, a mechanical seal can be set on the mating surface of the cleaning scraper 24 and the assembly channel 22, or a telescopic protective sleeve can be fitted on the outside of the second elastic element 23 to avoid the impact of feed residue and impurities on the performance of the second elastic element 23. The relevant protective details will not be elaborated here.

[0042] It should be noted that the outer wall of the crushing roller 18 is not provided with any outwardly extending protruding structures such as crushing nails or ridges. This can fundamentally avoid mechanical interference problems during cleaning operations: when the cleaning scraper 24 is in contact with the surface of the crushing roller 18 to scrape off the residue, the movement path of the cleaning scraper 24 will not be blocked or jammed by crushing nails or other protruding structures, ensuring that the cleaning components slide smoothly along the roller surface.

[0043] Please refer to Figure 1 In some embodiments of this application, a drive shaft 9 is coaxially fixedly mounted at the end of each crushing roller 18. The end of the drive shaft 9 away from the crushing roller 18 passes through the crushing housing 2 and extends to the outside of the crushing housing 2. The penetration position of the drive shaft 9 and the crushing housing 2 adopts a bearing mechanical seal structure. A drive gear 8 is fixedly fitted on the part of each drive shaft 9 located on the outside of the crushing housing 2. The drive gears 8 corresponding to the two crushing rollers 18 are in a meshing state. When one drive shaft 9 rotates under the drive of the drive assembly, the meshing transmission of the two drive gears 8 can synchronously drive the other drive shaft 9 to rotate in the opposite direction, thereby realizing the synchronous reverse rotation of the two crushing rollers 18, providing power for the shearing and crushing of feed.

[0044] The drive assembly includes a motor 13, a first sprocket 12, a second sprocket 10, and a transmission chain 11. The motor 13 is fixedly mounted on the frame 1. The first sprocket 12 is coaxially fixedly mounted on the output shaft of the motor 13. The second sprocket 10 is coaxially fixedly mounted on the end of one of the transmission shafts 9 located on the outer side of the crushing housing 2. The transmission chain 11 is fitted around the outer periphery of the first sprocket 12 and the second sprocket 10, forming a transmission engagement with the first sprocket 12 and the second sprocket 10 respectively. When the motor 13 starts, it drives the first sprocket 12 to rotate, and through the power transmission of the transmission chain 11, it drives the second sprocket 10 to rotate synchronously, thereby driving the corresponding transmission shaft 9 and the crushing roller 18 to rotate. With the meshing transmission of two transmission gears 8, the two crushing rollers 18 finally rotate in opposite directions.

[0045] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A feed crushing device, characterized in that, include: Rack (1); The crushing shell (2) is installed on the frame (1). The top of the crushing shell (2) is provided with a feeding port (3), the bottom of the crushing shell (2) is provided with a discharge port (17), and the two sides of the crushing shell (2) are respectively provided with installation interfaces (26). Two crushing rollers (18) are respectively rotatably assembled inside the crushing housing (2), and a crushing channel is formed between the two crushing rollers (18); A drive assembly capable of driving the two crushing rollers (18) to rotate in opposite directions; Two cleaning components are provided, and the two cleaning components are set one-to-one with the two installation interfaces (26). The cleaning components are installed at the corresponding installation interfaces (26). In the cleaning state, the cleaning component extends at least partially into the crushing shell (2), and the cleaning component can form a preset distance with the corresponding crushing roller (18); In the broken state, the cleaning component detaches from the broken housing (2) and forms a seal on the installation interface (26).

2. The feed crushing device according to claim 1, characterized in that, The cleaning component includes: Mounting base (4), wherein the mounting base (4) has a through guide slide (27), and the guide slide (27) is connected and adapted to the mounting interface (26); A cleaning scraper (5) is slidably fitted into the guide slide (27); In the cleaning state, the cleaning scraper (5) can be locked to the first position, and the cleaning scraper (5) and the corresponding crushing roller (18) form a preset distance; In the crushed state, the cleaning scraper (5) can be locked to the second position, and the cleaning scraper (5) can be disengaged from the inside of the crushed housing (2) to block the installation interface (26).

3. The feed crushing device according to claim 2, characterized in that, The mounting base (4) is provided with a travel groove (6) communicating with the guide slide (27) along a preset direction. The length of the travel groove (6) is adapted to the preset sliding stroke of the cleaning scraper (5). An operating lever (7) is installed on the cleaning scraper (5). The operating lever (7) passes through the travel groove (6) and can slide along the extension direction of the travel groove (6).

4. The feed crushing device according to claim 2 or 3, characterized in that, It also includes a locking pin (16); The cleaning scraper (5) has a positioning through hole (25) on its side wall; The side wall of the mounting base (4) is provided with a break lock hole (15) and a cleaning lock hole (14) from top to bottom; In the cleaning state, the cleaning scraper (5) moves to the first position, and the locking pin (16) passes through the cleaning lock hole (14) and the positioning through hole (25) in sequence; In the broken state, the cleaning scraper (5) moves to the second position, and the locking pin (16) passes through the broken lock hole (15) and the positioning through hole (25) in sequence.

5. The feed crushing device according to claim 4, characterized in that, The cleaning scraper (5) has a receiving groove (19) at the end near the crushing roller (18), and a cleaning abutment (21) is slidably fitted in the receiving groove (19); A first elastic element (20) is provided inside the receiving channel (19). One end of the first elastic element (20) is connected to the inner wall of the receiving channel (19), and the other end of the first elastic element (20) is connected to the cleaning abutment (21).

6. The feed crushing device according to claim 5, characterized in that, The cleaning seat (21) is provided with a plurality of assembly slots (22) along the extension direction at the end away from the first elastic member (20); A cleaning scraper (24) is slidably mounted in the assembly channel (22). A second elastic element (23) is provided in the assembly channel (22). One end of the second elastic element (23) is connected to the inner wall of the assembly channel (22), and the other end of the second elastic element (23) is connected to the cleaning scraper (24).

7. The feed crushing apparatus according to any one of claims 1 to 3, characterized in that, Each of the crushing rollers (18) is equipped with a drive shaft (9) at its end, the drive shaft (9) passing through the crushing housing (2) and extending to the outside of the crushing housing (2); A transmission gear (8) is fixedly mounted on the transmission shaft (9). The transmission gears (8) corresponding to the two crushing rollers (18) mesh with each other, thereby realizing that the two crushing rollers (18) rotate synchronously in opposite directions.

8. The feed crushing device according to claim 7, characterized in that, The driving component includes: Motor (13), said motor (13) is mounted on said frame (1); The first sprocket (12) is mounted on the output shaft of the motor (13); The second sprocket (10) is mounted on one of the drive shafts (9); A transmission chain (11) is fitted onto the first sprocket (12) and the second sprocket (10), and the transmission chain (11) is in transmission cooperation with the first sprocket (12) and the second sprocket (10) respectively.

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