Lactic acid bacteria dairy product fermentation culture device with lactose decomposition function
By introducing a spiral stirring rod and an electric heating wire into the fermentation tank, and combining multiple stirring states, the problems of uneven stirring and insufficient temperature control in traditional fermentation equipment are solved, achieving efficient decomposition and stable fermentation of lactose, and improving the efficiency of lactic acid bacteria fermentation and product quality.
Patent Information
- Application Number
- CN202510685673.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-27
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2045-05-27
AI Technical Summary
Traditional fermentation equipment suffers from uneven mixing and insufficient temperature control precision, resulting in low lactose decomposition efficiency, which affects the fermentation effect of lactic acid bacteria and increases production costs and energy consumption.
A fermenter equipped with a spiral stirring rod and an electric heating wire is used, combined with a drive mechanism, a synchronization mechanism and a stirring mechanism to achieve multiple stirring states superimposed, ensuring a large and uniform stirring coverage and heating uniformity. By coordinating the three stirring states, the efficiency of lactose decomposition is improved.
It achieves efficient decomposition and stable fermentation of lactose, reduces energy consumption and production costs, and improves the uniformity of lactic acid bacteria fermentation and the quality of the final product.
Smart Images
Figure CN120477246B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of fermentation stirring technology, specifically to a lactic acid bacteria fermentation and cultivation device for dairy products with the function of decomposing lactose. Background Technology
[0002] People with lactose intolerance have difficulty breaking down lactose due to a lack of β-galactosidase in their intestines. Lactic acid bacteria fermented dairy products can alleviate this problem by metabolizing lactose to produce functional products, such as lactic acid or galactose. Traditional fermentation equipment usually uses static fermenters that rely on unidirectional stirring devices, i.e., fixed stirring rods and heating wires, but their stirring and heating methods have significant defects.
[0003] Firstly, traditional stirring methods produce uneven mixing effects. A single stirring direction leads to material stratification, an unbalanced distribution of dissolved oxygen, limited lactic acid bacteria growth, low lactose decomposition efficiency, and easy sedimentation and clumping of fermentation products, affecting the uniformity of the final product. Secondly, temperature control precision is insufficient. Heating wires or water baths have a delayed response, resulting in temperature fluctuations within the tank exceeding ±3℃. Localized overheating (>45℃) can damage bacterial activity, while low-temperature areas (<35℃) cause a sharp drop in metabolic rate, resulting in a lactose conversion rate of less than 60%. To compensate for the metabolic deficiencies of the bacteria, additional lactose or glucose must be added to maintain the fermentation process, increasing costs and introducing impurities, which contradicts the trend of low-additive health foods. Therefore, there is an urgent need to develop a fermentation device that integrates efficient mixing and precise temperature control to achieve efficient lactose decomposition and stable fermentation, while simultaneously reducing energy consumption and production costs. Summary of the Invention
[0004] The purpose of this invention is to provide a lactic acid bacteria fermentation and cultivation device for dairy products with lactose decomposition function, so as to solve the problems mentioned in the prior art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a lactic acid bacteria fermentation and cultivation device for lactose decomposition, comprising a fermentation tank, a feed pipe, a discharge pipe, a stirring mechanism, a drive mechanism, and a synchronization mechanism. The feed pipe and the discharge pipe are respectively connected to the bottom of the fermentation tank. A viewing window is provided on the upper part of the fermentation tank. The drive mechanism and the synchronization mechanism are mounted above the fermentation tank via a mounting bracket. The drive mechanism includes a sealing shaft and a stirring arm. The sealing shaft passes through the top of the fermentation tank. The stirring arm is connected to the sealing shaft and is located inside the fermentation tank. The stirring mechanism is mounted on the stirring arm. The synchronization mechanism is located above the drive mechanism.
[0006] Furthermore, both the feed pipe and the discharge pipe are equipped with solenoid valves, and the inner wall of the fermentation tank is equipped with an electric heating wire. A sealing rubber ring is provided at the contact position between the sealing shaft and the top of the fermentation tank. The sealing shaft is slidably connected to the fermentation tank. The dairy products and fermentation starter enter the fermentation tank through the feed pipe. The dairy products are heated by the electric heating wires on the inner wall of the fermentation tank and the electric heating wires in the spiral stirring rod. The drive mechanism, stirring mechanism and synchronization mechanism work together to stir the dairy products. After the processing and fermentation are completed, the finished product is discharged through the discharge pipe.
[0007] Furthermore, the stirring arm is arc-shaped, and its outline is the same as the internal outline of the fermentation tank. A hollow sliding groove is provided on the stirring arm, and side positioning grooves are provided on both sides of the hollow sliding groove. The stirring mechanism includes a slider and four sliding pins. The four sliding pins are symmetrically installed on both sides of the slider. The slider is located in the hollow sliding groove, and the four sliding pins are respectively installed in a pair of side positioning grooves. When the second motor is powered on, it drives the worm gear to rotate. The worm gear drives the worm wheel to rotate. The worm wheel drives the spline shaft to rotate through the inner spline groove. The sealing shaft rotates synchronously with the stirring arm. The stirring arm drives the stirring mechanism to rotate in the fermentation tank.
[0008] Furthermore, the stirring mechanism includes a first motor, a mounting plate, and several spiral stirring rods. The first motor is inverted and installed in the slider. The first motor is connected to the control system circuit via an electrical circuit. The mounting plate is connected to the motor shaft of the first motor. The several spiral stirring rods are evenly distributed in a ring on the mounting plate. The spiral diameter of each spiral stirring rod increases linearly. Each spiral stirring rod has an electric heating wire in the middle. The first motor drives the mounting plate to rotate, and the mounting plate drives the spiral stirring rods to rotate. The spiral stirring rods stir the dairy products, while the electric heating wires heat the dairy products.
[0009] Furthermore, an internal circulation groove is provided at the top of the inner wall of the fermenter. The stirring mechanism also includes an elastic telescopic component, which is installed on the side of the slider away from the mounting plate. The elastic telescopic component is slidably disposed in the internal circulation groove. During the rotation of the stirring arm, since the elastic telescopic component is restricted in the internal circulation groove, it slides along the internal circulation groove, forcing the slider to slide back and forth along the hollow groove on the stirring arm. During the sliding process, the tilt angle of the slider changes with the curvature of the stirring arm. At this time, the spiral stirring rod has three stirring states simultaneously. First, the mounting plate drives the spiral stirring rod to rotate. Second, the spiral stirring rod slides back and forth along the hollow groove of the stirring arm and changes the stirring tilt angle. Finally, the rotation of the stirring arm drives the spiral stirring rod to revolve in the fermenter. Through the superposition of the three stirring states, the stirring coverage of the spiral stirring rod is large, the stirring uniformity is better, and the heating uniformity is better.
[0010] Furthermore, the drive mechanism includes a splined shaft, a light shaft, a worm gear, a worm, and a second motor. The splined shaft is connected to the side of the sealing shaft away from the stirring arm, and the light shaft is installed on the side of the splined shaft away from the sealing shaft. A protrusion is provided on the light shaft, and the sealing shaft, splined shaft, and light shaft are integrally formed.
[0011] Furthermore, the worm gear, worm, and second motor are all mounted on the mounting bracket. The worm is connected to the motor shaft of the second motor, and the worm gear is meshed with the worm. An internal spline hole is provided in the middle of the worm gear, and the internal spline hole is slidably connected to the spline shaft.
[0012] Furthermore, the synchronization mechanism includes a synchronous motor and a cylindrical cam, both mounted on a mounting bracket. The synchronous motor is connected to the control system circuit, and the cylindrical cam is connected to the motor shaft of the synchronous motor. A synchronous circulation groove is formed on the inner wall of the cylindrical cam, and the protrusion is slidably disposed in the synchronous circulation groove. When the slider slides to the end of the stirring arm, the slider's tilt angle is at its maximum; when the slider approaches the sealing shaft, the slider's tilt angle is at its minimum. Since the greater the tilt angle of the spiral stirring rod, the shallower the stirring depth, the synchronous motor drives the cylindrical cam to rotate, and the synchronous circulation groove forces the protrusion to move along its trajectory, further forcing the stirring arm to slide up and down while rotating. The rotation of the cylindrical cam maintains a suitable synchronization rate with the rotation of the stirring arm. Whenever the slider's tilt angle is at its maximum and the spiral stirring rod's stirring depth is shallower, the cylindrical cam pushes the optical shaft to lower its height, deepening the stirring depth of the spiral stirring rod, thereby compensating for the problem of the spiral stirring rod's stirring depth becoming shallower due to the change in the slider's tilt angle.
[0013] Compared with the prior art, the beneficial effects of the present invention are:
[0014] The spiral stirrer has three stirring states simultaneously. First, the mounting plate drives the spiral stirrer to rotate. Second, the spiral stirrer slides back and forth along the hollow groove of the stirring arm and changes the stirring angle. Finally, the rotation of the stirring arm drives the spiral stirrer to revolve in the fermentation tank. Through the superposition of the three stirring states, the spiral stirrer has a large stirring coverage, better stirring uniformity, and better heating uniformity. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention. Figure 1 ;
[0016] Figure 2 This is a schematic diagram of the overall appearance and structure of the present invention. Figure 2 ;
[0017] Figure 3 This is a schematic diagram of the internal structure of the present invention. Figure 1 ;
[0018] Figure 4 This is a schematic diagram of the internal structure of the present invention. Figure 2 ;
[0019] Figure 5 This is a schematic diagram of the drive mechanism of the present invention. Figure 1 ;
[0020] Figure 6 This is a schematic diagram of the drive mechanism of the present invention. Figure 2 ;
[0021] Figure 7 This is a schematic diagram of the cylindrical cam structure of the present invention.
[0022] In the diagram: 1. Fermentation tank; 2. Feed pipe; 3. Discharge pipe; 4. Inspection window; 5. Sealing shaft; 6. Splined shaft; 7. Optical shaft; 8. Stirring arm; 9. Slider; 10. Sliding pin; 11. First motor; 12. Mounting plate; 13. Spiral stirring rod; 14. Worm gear; 15. Worm; 16. Second motor; 17. Synchronous motor; 18. Protruding column; 19. Cylindrical cam; 20. Elastic telescopic component; 21. Internal circulation groove; 22. Synchronous circulation groove. Detailed Implementation
[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] Example: Figures 1-7As shown, this invention provides a technical solution: a lactic acid bacteria fermentation and cultivation device for dairy products with lactose-decomposing function, comprising a fermentation tank 1, a feed pipe 2, a discharge pipe 3, a stirring mechanism, a drive mechanism, and a synchronization mechanism. The feed pipe 2 and the discharge pipe 3 are respectively connected to the bottom of the fermentation tank 1. A viewing window 4 is provided on the upper part of the fermentation tank 1. The drive mechanism and the synchronization mechanism are mounted above the fermentation tank 1 via a mounting bracket. The drive mechanism includes a sealing shaft 5 and a stirring arm 8. The sealing shaft 5 passes through the top of the fermentation tank 1, and the stirring arm 8 is connected to the sealing shaft 5 and located inside the fermentation tank 1. The stirring mechanism is set in the stirring... On arm 8, the synchronization mechanism is located above the drive mechanism. Solenoid valves are installed in both the feed pipe 2 and the discharge pipe 3. Electric heating wires are installed in the inner wall of the fermentation tank 1. A sealing rubber ring is installed at the contact position between the sealing shaft 5 and the top of the fermentation tank 1. The sealing shaft 5 is slidably connected to the fermentation tank 1. Dairy products and fermentation starters enter the fermentation tank 1 through the feed pipe 2. The dairy products are heated by the electric heating wires in the inner wall of the fermentation tank 1 and the electric heating wires in the spiral stirring rod 13. The drive mechanism, stirring mechanism and synchronization mechanism work together to stir the dairy products. After the processing and fermentation are completed, the finished product is discharged through the discharge pipe 3.
[0025] The stirring arm 8 is arc-shaped, and its outline is the same as the internal outline of the fermenter 1. A hollow groove is formed on the stirring arm 8, and side positioning grooves are formed on both sides of the hollow groove. The stirring mechanism includes a slider 9 and four sliding pins 10. The four sliding pins 10 are symmetrically installed in pairs on both sides of the slider 9. The slider 9 is located in the hollow groove, and the four sliding pins 10 are respectively installed in a pair of side positioning grooves. The stirring mechanism includes a first motor 11, a mounting plate 12, and several spiral stirring rods 13. The first motor 11 is inverted and installed in the slider 9. The first motor 11 is connected to... The circuit is connected to the control system circuit. The mounting plate 12 is connected to the motor shaft of the first motor 11. Several spiral stirring rods 13 are evenly distributed in a ring on the mounting plate 12. The spiral diameter of each spiral stirring rod 13 increases linearly. An electric heating wire is provided in the middle of each spiral stirring rod 13. An internal circulation groove 21 is opened at the top of the inner wall of the fermentation tank 1. The stirring mechanism also includes an elastic telescopic component 20. The elastic telescopic component 20 is installed on the side of the slider 9 away from the mounting plate 12. The elastic telescopic component 20 is slidably disposed in the internal circulation groove 21.
[0026] The second motor 16 is energized, driving the worm gear 15 to rotate. The worm gear 15 drives the worm wheel 14 to rotate, and the worm wheel 14 drives the spline shaft 6 to rotate through the inner spline groove. The sealing shaft 5 rotates synchronously with the stirring arm 8. The stirring arm 8 drives the stirring mechanism to rotate in the fermentation tank 1. The first motor 11 drives the mounting plate 12 to rotate, and the mounting plate 12 drives the spiral stirring rod 13 to rotate. The spiral stirring rod 13 stirs the dairy products, and at the same time, the electric heating wire heats the dairy products. During the rotation of the stirring arm 8, because the elastic telescopic member 20 is restricted in the cavity circulation groove 21, the elastic telescopic member 20 slides along the cavity circulation groove 21. The slider 9 Forced sliding causes slider 9 to slide back and forth along the hollow groove on the stirring arm 8. During the sliding process, the tilt angle of slider 9 changes with the curvature of the stirring arm 8. At this time, the spiral stirring rod 13 has three stirring states at the same time. First, the mounting plate 12 drives the spiral stirring rod 13 to rotate. Second, the spiral stirring rod 13 slides back and forth along the hollow groove of the stirring arm 8 and changes the stirring tilt angle. Finally, the rotation of the stirring arm 8 drives the spiral stirring rod 13 to revolve in the fermentation tank 1. Through the superposition of the three stirring states, the stirring coverage of the spiral stirring rod 13 is large, the stirring uniformity is better, and the heating uniformity is better.
[0027] The drive mechanism includes a splined shaft 6, a smooth shaft 7, a worm gear 14, a worm 15, and a second motor 16. The splined shaft 6 is connected to the side of the sealing shaft 5 away from the stirring arm 8. The smooth shaft 7 is installed on the side of the splined shaft 6 away from the sealing shaft 5. A protrusion 18 is provided on the smooth shaft 7. The sealing shaft 5, splined shaft 6, and smooth shaft 7 are integrally formed. The worm gear 14, worm 15, and second motor 16 are all mounted on a mounting bracket. The worm 15 is connected to the motor shaft of the second motor 16. The worm gear 14 is meshed with the worm 15. An internal spline hole is opened in the middle of the worm gear 14, and the internal spline hole is slidably connected to the splined shaft 6. The synchronization mechanism includes a synchronous motor 17 and a cylindrical cam 19. Both the synchronous motor 17 and the cylindrical cam 19 are mounted on a mounting bracket. The synchronous motor 17 is connected to the control system circuit. The cylindrical cam 19 is connected to the motor shaft of the synchronous motor 17. A synchronous circulation groove 22 is provided on the inner wall of the device. The protrusion 18 is slidably disposed in the synchronous circulation groove 22. When the slider 9 slides to the end of the stirring arm 8, the tilt angle of the slider 9 is the largest. When the slider 9 is close to the sealing shaft 5, the tilt angle of the slider 9 is the smallest. Since the larger the tilt angle of the spiral stirring rod 13 is, the shallower the stirring depth is, the synchronous motor 17 drives the cylindrical cam 19 to rotate. The synchronous circulation groove 22 forces the protrusion 18 to move along its trajectory, and further forces the stirring arm 8 to slide up and down while rotating. The rotation of the cylindrical cam 19 and the rotation of the stirring arm 8 maintain a suitable synchronization rate. Whenever the tilt angle of the slider 9 is the largest and the stirring depth of the spiral stirring rod 13 is the shallowest, the cylindrical cam 19 pushes the optical shaft 7 to lower its height and deepen the stirring depth of the spiral stirring rod 13, thereby compensating for the problem of the spiral stirring rod 13 becoming shallower due to the change in the tilt angle of the slider 9.
[0028] The working principle of this invention is as follows: dairy products and fermentation starters enter the fermentation tank 1 through the feed pipe 2. The dairy products are heated by the electric heating wires on the inner wall of the fermentation tank 1 and the electric heating wires in the spiral stirring rod 13. The driving mechanism, stirring mechanism and synchronization mechanism work together to stir the dairy products. After the processing and fermentation are completed, the finished product is discharged through the discharge pipe 3.
[0029] The second motor 16 is energized, driving the worm gear 15 to rotate. The worm gear 15 drives the worm wheel 14 to rotate, and the worm wheel 14 drives the spline shaft 6 to rotate through the inner spline groove. The sealing shaft 5 rotates synchronously with the stirring arm 8. The stirring arm 8 drives the stirring mechanism to rotate in the fermentation tank 1. The first motor 11 drives the mounting plate 12 to rotate, and the mounting plate 12 drives the spiral stirring rod 13 to rotate. The spiral stirring rod 13 stirs the dairy products, and at the same time, the electric heating wire heats the dairy products. During the rotation of the stirring arm 8, because the elastic telescopic member 20 is restricted in the cavity circulation groove 21, the elastic telescopic member 20 slides along the cavity circulation groove 21. The slider 9 Forced sliding causes slider 9 to slide back and forth along the hollow groove on the stirring arm 8. During the sliding process, the tilt angle of slider 9 changes with the curvature of the stirring arm 8. At this time, the spiral stirring rod 13 has three stirring states at the same time. First, the mounting plate 12 drives the spiral stirring rod 13 to rotate. Second, the spiral stirring rod 13 slides back and forth along the hollow groove of the stirring arm 8 and changes the stirring tilt angle. Finally, the rotation of the stirring arm 8 drives the spiral stirring rod 13 to revolve in the fermentation tank 1. Through the superposition of the three stirring states, the stirring coverage of the spiral stirring rod 13 is large, the stirring uniformity is better, and the heating uniformity is better.
[0030] When slider 9 slides to the end of stirring arm 8, slider 9 has the largest tilt angle. When slider 9 is close to sealing shaft 5, slider 9 has the smallest tilt angle. Since the larger the tilt angle of spiral stirring rod 13, the shallower the stirring depth, the synchronous motor 17 drives the cylindrical cam 19 to rotate. The synchronous circulation groove 22 forces the protrusion 18 to move along its trajectory, further forcing the stirring arm 8 to slide up and down while rotating. The rotation of cylindrical cam 19 and the rotation of stirring arm 8 maintain a suitable synchronization rate. Whenever the tilt angle of slider 9 is the largest and the stirring depth of spiral stirring rod 13 is the shallowest, cylindrical cam 19 pushes optical shaft 7 to lower its height, deepening the stirring depth of spiral stirring rod 13, thereby compensating for the problem of the shallow stirring depth of spiral stirring rod 13 caused by the change in the tilt angle of slider 9.
[0031] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A lactic acid bacteria fermentation and cultivation device for dairy products with lactose-decomposing function, characterized in that: The fermentation tank (1), feed pipe (2), discharge pipe (3), stirring mechanism, drive mechanism and synchronization mechanism are included. The feed pipe (2) and discharge pipe (3) are respectively connected to the bottom of the fermentation tank (1). A viewing window (4) is provided on the upper part of the fermentation tank (1). An electric heating wire is provided in the inner wall of the fermentation tank (1). The drive mechanism and synchronization mechanism are set above the fermentation tank (1) by a mounting bracket. The drive mechanism includes a sealing shaft (5), stirring arm (8), spline shaft (6), optical shaft (7), worm gear (14), worm (15) and second motor (16). The sealing shaft (5) passes through the top of the fermentation tank (1). The stirring arm (8) is connected to the sealing shaft (5). The stirring arm (8) is located inside the fermentation tank (1). The stirring mechanism is set on the stirring arm (8). The synchronization mechanism is located above the drive mechanism. The stirring arm (8) is arc-shaped, and the outline of the stirring arm (8) is the same as the internal outline of the fermentation tank (1). A hollow sliding groove is provided on the stirring arm (8), and side positioning grooves are provided on both sides of the hollow sliding groove. The stirring mechanism includes a slider (9) and four sliding pins (10). The four sliding pins (10) are symmetrically installed on both sides of the slider (9). The slider (9) is located in the hollow sliding groove, and the four sliding pins (10) are respectively installed in a pair of side positioning grooves. The stirring mechanism includes a first motor (11), a mounting plate (12), and several spiral stirring rods (13). The first motor (11) is inverted and installed in the slider (9). The first motor (11) is connected to the control system circuit through a circuit. The mounting plate (12) is connected to the motor shaft of the first motor (11). Several spiral stirring rods (13) are evenly distributed in a ring on the mounting plate (12). The spiral diameter of each spiral stirring rod (13) increases linearly. Each spiral stirring rod (13) is provided with an electric heating wire in the middle. The fermenter (1) has an internal circulation groove (21) on the top of its inner wall. The stirring mechanism also includes an elastic telescopic component (20). The elastic telescopic component (20) is installed on the side of the slider (9) away from the mounting plate (12). The elastic telescopic component (20) is slidably disposed in the internal circulation groove (21).
2. The lactic acid bacteria fermentation and cultivation equipment for dairy products with lactose decomposition function according to claim 1, characterized in that: Both the feed pipe (2) and the discharge pipe (3) are equipped with solenoid valves. The sealing shaft (5) is provided with a sealing rubber ring at the contact position with the top of the fermentation tank (1). The sealing shaft (5) and the fermentation tank (1) are connected in a sealed sliding connection.
3. The lactic acid bacteria fermentation and cultivation equipment for dairy products with lactose decomposition function according to claim 1, characterized in that: The spline shaft (6) is connected to the side of the sealing shaft (5) away from the stirring arm (8), and the optical shaft (7) is installed on the side of the spline shaft (6) away from the sealing shaft (5). A protrusion (18) is provided on the optical shaft (7). The sealing shaft (5), the spline shaft (6) and the optical shaft (7) are integrally formed.
4. The lactic acid bacteria fermentation and cultivation equipment for dairy products with lactose decomposition function according to claim 3, characterized in that: The worm wheel (14), worm (15) and second motor (16) are all mounted on the mounting bracket. The worm (15) is connected to the motor shaft of the second motor (16). The worm wheel (14) is meshed with the worm (15). The worm wheel (14) has an internal spline hole in the middle, and the internal spline hole is slidably connected to the spline shaft (6).
5. The lactic acid bacteria fermentation and cultivation equipment for dairy products with lactose decomposition function according to claim 3, characterized in that: The synchronization mechanism includes a synchronous motor (17) and a cylindrical cam (19). Both the synchronous motor (17) and the cylindrical cam (19) are mounted on a mounting bracket. The synchronous motor (17) is connected to the control system circuit. The cylindrical cam (19) is connected to the motor shaft of the synchronous motor (17). A synchronous circulation groove (22) is provided on the inner wall of the cylindrical cam (19). The protrusion (18) is slidably disposed in the synchronous circulation groove (22).
Citation Information
Patent Citations
Feed mixed fermentation device
CN116376676A
Automatic fermentation cylinder agitating unit of mechanical type
CN205170827U