A high-precision batching tank for vaccine production

Abstract

The utility model discloses a high-precision batching tank for vaccine production, comprising a tank body, wherein the top of the tank body is provided with an opening, the inner cavity of the opening is provided with a fixed frame, the inner cavity of the fixed frame is provided with three conical filter screens, and the filter apertures on the three conical filter screens decrease in sequence from top to bottom. The utility model provides an installation mechanism, and through the mutual cooperation between the fixed groove, the connecting rod, the pull plate, the pull rod, the moving block, the square rod, the second spring, the plug rod and the movable plate, it is convenient to install and disassemble the tank body and the top cover, thereby facilitating the disassembly and replacement of the conical filter screen. The utility model provides a moving mechanism, and through the mutual cooperation between the active conical gear, the servo motor, the worm, the worm wheel, the third spring, the vertical rod, the universal wheel, the cam and the driven conical gear, it is convenient to drive the device to move, thereby improving the flexibility of use.

Description

Technical Field

[0001] The utility model relates to the technical field of vaccine production, in particular to a high-precision batching tank for vaccine production. Background Art

[0002] Vaccines are immune preparations used to prevent infectious diseases that are made by artificially attenuating, inactivating or genetically modifying pathogenic microorganisms and their metabolites. Vaccines retain the characteristics of pathogens in stimulating the immune system of animals. Existing animal vaccines require a batching tank to fully mix the vaccine liquid with skim milk, gelatin, sucrose and other dry materials before freeze-drying, so high-precision batching tanks for vaccine production were born.

[0003] Because the high-precision batching tank used in traditional vaccine production is not easy to remove the top cover during use, it is difficult to replace the filter. At the same time, the traditional device is not easy to move the batching tank, resulting in poor practicality of the device. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, one of the purposes of the utility model is to provide a high-precision batching tank for vaccine production.

[0005] One of the purposes of the utility model is achieved by the following technical solution:

[0006] A high-precision batching tank for vaccine production comprises a tank body, wherein an opening is provided at the top of the tank body, a fixed frame is provided in the inner cavity of the opening, three conical filter screens are provided in the inner cavity of the fixed frame, and the filter apertures on the three conical filter screens decrease in sequence from top to bottom, a top cover is provided at the top of the tank body, and an annular pad is provided at the bottom of the top cover, a feeding hopper is plugged into the top of the top cover, and mounting mechanisms are provided at both left and right sides of the top cover, a rectangular groove is fixedly connected to the left side of the tank body near the bottom, and a driving motor is fixedly connected to the left side of the inner cavity of the rectangular groove, a stirring shaft is fixedly connected to the output shaft of the driving motor, first bearings are fixedly connected to the left and right sides of the tank body near the bottom, the right end of the stirring shaft passes through the adjacent first bearing and is plugged into the inner cavity away from the first bearing, and a plurality of stirring rods are fixedly connected to the outer side of the stirring shaft, a discharge pipe is plugged into the bottom of the right side of the tank body, and a valve matching the discharge pipe is provided on the outer side of the discharge pipe, a mounting groove is fixedly connected to the bottom of the tank body, and a moving mechanism is provided in the inner cavity of the mounting groove.

[0007] Furthermore, a vertical plate is provided on the opposite side of the fixed frame near the top, and the bottom of the vertical plate is fixedly connected to the tank body, through holes are opened on the two vertical plates, and the inner cavities of the two through holes are penetrated by latches, and the outer sides of the two latches are sleeved with a first spring, and the two ends of the first spring are respectively fixedly connected to the latch and the vertical plate, and blind holes are opened on the left and right sides of the fixed frame near the top, and the opposite ends of the two latches are respectively inserted into the inner cavities of adjacent blind holes.

[0008] Furthermore, the mounting mechanism includes a fixing groove, which is fixedly connected to the right side of the top of the tank body, and two movable blocks are provided in the inner cavity of the fixing groove near the right side, and the two movable blocks are arranged up and down, and the right sides of the two movable blocks are fixedly connected to a limiting plate, and a square hole is provided on the limiting plate, and a square rod is provided through the two square holes, and the upper and lower ends of the square rod are fixedly connected to the inner cavity of the fixing groove.

[0009] Furthermore, pull rods are fixedly connected to opposite sides of the two moving blocks, through holes are provided at the top and bottom of the fixed groove near the right side, and opposite ends of the two pull rods respectively pass through the inner cavities of adjacent through holes and are fixedly connected to pull plates. Second springs are sleeved on the outer sides of the two pull rods, and the two ends of the second springs are respectively fixedly connected to the moving block and the inner cavity of the fixed groove.

[0010] Furthermore, the left sides of the two moving blocks are hinged with connecting rods, and a movable plate is provided near the left side of the fixed groove inner cavity, the ends of the two connecting rods away from the adjacent moving blocks are hinged to the right side of the movable plate, and the top and bottom of the movable plate are fixedly connected with first sliders, the top and bottom of the fixed groove inner cavity are provided with first slide grooves, the two first sliders are movably connected to the inner cavities of adjacent first slide grooves, an insertion rod is fixedly connected to the left side of the movable plate, a slot is provided near the bottom on the right side of the top cover, and the left end of the insertion rod is inserted into the inner cavity of the slot.

[0011] Furthermore, the moving mechanism includes two sliding plates, the sliding plates are arranged near the bottom of the inner cavity of the mounting groove, and the bottom of the sliding plates near the four corners are fixedly connected with universal wheels, the left and right sides of the sliding plates are fixedly connected with second sliders, the left and right sides of the inner cavity of the mounting groove are provided with second slide grooves, the two second sliders are movably connected to the inner cavities of adjacent second slide grooves, the two second sliders are provided with fixing holes, and the inner cavities of the fixing holes are penetrated by vertical rods, the upper and lower ends of the vertical rods are fixedly connected to the inner cavity of the second slide groove, the outer sides of the two vertical rods are sleeved with third springs, and the upper and lower ends of the third spring are fixedly connected to the second slider and the bottom of the inner cavity of the second slide groove respectively.

[0012] Furthermore, cams are provided on the top of the sliding plate near the left and right sides, and rotating shafts are fixedly connected to the opposite sides of the two cams near the bottom. The opposite ends of the two rotating shafts are movably connected to the inner cavity of the mounting groove, and worm wheels are sleeved on the outer sides of the two rotating shafts, and a worm is meshed on the front side of the worm wheel. A cross plate is fixedly connected to the inner cavity of the mounting groove near the middle position, and a second bearing is fixedly connected to the cross plate near the left and right sides, and the top ends of the two worms respectively penetrate the inner cavities of adjacent second bearings and are fixedly connected to driven cones. Gear, a protective groove is fixedly connected to the right side of the mounting groove near the top, and a servo motor is fixedly connected to the right side of the inner cavity of the protective groove, and a transmission rod is fixedly connected to the output shaft of the servo motor, and a third bearing is fixedly connected to the left and right sides of the inner cavity of the mounting groove near the top, the left end of the transmission rod passes through the adjacent third bearing and is inserted in the inner cavity away from the third bearing, and active bevel gears are fixedly connected to the outer side of the transmission rod near the left and right ends, and the bottoms of the two active bevel gears are respectively meshed with the adjacent driven bevel gears.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The utility model is provided with an installation mechanism, and the fixing groove, the connecting rod, the pull plate, the pull rod, the moving block, the square rod, the second spring, the plug rod and the movable plate cooperate with each other, so as to facilitate the installation and disassembly between the tank body and the top cover, thereby facilitating the disassembly and replacement of the conical filter screen;

[0015] 2. The utility model sets a moving mechanism, and cooperates with each other among the active bevel gear, servo motor, worm, worm wheel, third spring, vertical rod, universal wheel, cam and driven bevel gear, so as to facilitate the movement of the device and improve the flexibility of use.

[0016] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional diagram of this embodiment;

[0018] Figure 2 It is a front cross-sectional view of this embodiment;

[0019] Figure 3 For this embodiment Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 For this embodiment Figure 2 Enlarged view of point B in the middle.

[0021] In the figure: 1. tank body; 2. fixed groove; 3. hopper; 4. mounting groove; 5. rectangular groove; 6. top cover; 7. latch; 8. drive motor; 9. stirring shaft; 10. sliding plate; 11. stirring rod; 12. fixed frame; 13. first spring; 14. conical filter; 15. connecting rod; 16. pull plate; 17. pull rod; 18. moving block; 19. square rod; 20. second spring; 21. plug rod; 22. movable plate; 23. active bevel gear; 24. servo motor; 25. worm; 26. worm wheel; 27. third spring; 28. vertical rod; 29. ​​universal wheel; 30. cam; 31. driven bevel gear. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0023] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] See also Figures 1 to 4A high-precision batching tank for vaccine production comprises a tank body 1, an opening is provided at the top of the tank body 1, and a fixing frame 12 is provided in the inner cavity of the opening, and a vertical plate is provided near the top on the opposite side of the fixing frame 12, and the bottom of the vertical plate is fixedly connected to the tank body 1, and a through hole is provided on the two vertical plates, and a latch 7 is penetrated through the inner cavity of the two perforations, and a first spring 13 is sleeved on the outer side of the two latches 7, and the two ends of the first spring 13 are respectively fixedly connected to the latch 7 and the vertical plate, and blind holes are provided on the left and right sides of the fixing frame 12 near the top, and the opposite ends of the two latches 7 are respectively plugged into the inner cavity of adjacent blind holes, and three conical filter screens 14 are provided in the inner cavity of the fixing frame 12, and the filter apertures on the three conical filter screens 14 decrease successively from top to bottom, and the top of the tank body 1 is provided with a There is a top cover 6, and a ring pad is provided at the bottom of the top cover 6, a feeding hopper 3 is inserted at the top of the top cover 6, and mounting mechanisms are provided on both sides of the top cover 6, a rectangular groove 5 is fixedly connected to the left side of the tank body 1 near the bottom, and a driving motor 8 is fixedly connected to the left side of the inner cavity of the rectangular groove 5, and a stirring shaft 9 is fixedly connected to the output shaft of the driving motor 8, and a first bearing is fixedly connected to the left and right sides of the tank body 1 near the bottom, the right end of the stirring shaft 9 passes through the adjacent first bearing and is inserted in the inner cavity away from the first bearing, and a plurality of stirring rods 11 are fixedly connected to the outside of the stirring shaft 9, a discharge pipe is inserted at the bottom of the right side of the tank body 1, and a valve matching it is provided on the outside of the discharge pipe, and a mounting groove 4 is fixedly connected to the bottom of the tank body 1, and a moving mechanism is provided in the inner cavity of the mounting groove 4.

[0026] The mounting mechanism includes a fixed groove 2, which is fixedly connected to the right side of the top of the tank body 1, and two moving blocks 18 are provided near the right side of the inner cavity of the fixed groove 2, and the left sides of the two moving blocks 18 are hinged with connecting rods 15, and a movable plate 22 is provided near the left side of the inner cavity of the fixed groove 2, and the ends of the two connecting rods 15 away from the adjacent moving blocks 18 are hinged to the right side of the movable plate 22, and the top and bottom of the movable plate 22 are fixedly connected with a first slider, and the top and bottom of the inner cavity of the fixed groove 2 are provided with a first slide groove, and the two first slides are movably connected to the inner cavity of the adjacent first slide grooves, respectively, and the left side of the movable plate 22 is fixedly connected with an insertion rod 21, and a slot is provided near the bottom of the right side of the top cover 6, and the left end of the insertion rod 21 is inserted into the insertion rod 21. The inner cavity of the groove, the opposite sides of the two moving blocks 18 are fixedly connected with pull rods 17, the top and bottom of the fixed groove 2 near the right side are provided with through holes, the opposite ends of the two pull rods 17 respectively pass through the inner cavities of adjacent through holes, and are fixedly connected with pull plates 16, the outer sides of the two pull rods 17 are sleeved with second springs 20, and the two ends of the second spring 20 are respectively fixedly connected to the moving blocks 18 and the inner cavity of the fixed groove 2, the two moving blocks 18 are arranged up and down, the right sides of the two moving blocks 18 are fixedly connected with limit plates, and the limit plates are provided with square holes, the two square holes are jointly penetrated by a square rod 19, and the upper and lower ends of the square rod 19 are fixedly connected to the inner cavity of the fixed groove 2, which is convenient for installation and disassembly of the top cover 6 and easy operation.

[0027] The moving mechanism includes two sliding plates 10, which are arranged near the bottom of the inner cavity of the mounting groove 4. Cams 30 are provided on the top of the sliding plate 10 near the left and right sides. The opposite sides of the two cams 30 are fixedly connected with rotating shafts near the bottom. The opposite ends of the two rotating shafts are movably connected to the inner cavity of the mounting groove 4. Worm wheels 26 are sleeved on the outer sides of the two rotating shafts, and the front sides of the worm wheels 26 are meshed with worms 25. A cross plate is fixedly connected near the middle position of the inner cavity of the mounting groove 4, and second bearings are fixedly connected on the cross plate near the left and right sides. The top ends of the two worms 25 respectively penetrate the inner cavities of adjacent second bearings and are fixedly connected with driven bevel gears 31. A guard groove is fixedly connected near the top on the right side of the mounting groove 4, and a servo motor 24 is fixedly connected to the right side of the inner cavity of the guard groove, and the output shaft of the servo motor 24 is fixedly connected to a transmission rod. The third bearings are fixedly connected near the top on both sides of the inner cavity of the mounting groove 4. The left end of the rod passes through the adjacent third bearing and is inserted into the inner cavity away from the third bearing, and the outer side of the transmission rod is fixedly connected with an active bevel gear 23 near the left and right ends, and the bottoms of the two active bevel gears 23 are respectively meshed with the adjacent driven bevel gears 31, and the bottom of the sliding plate 10 is fixedly connected with a universal wheel 29 near the four corners, and the left and right sides of the sliding plate 10 are fixedly connected with a second slider, and the left and right sides of the inner cavity of the mounting groove 4 are provided with a second slide groove, and the two second sliders are movably connected to the inner cavity of the adjacent second slide groove, and the two second sliders are provided with a fixing hole, and the inner cavity of the fixing hole is penetrated by a vertical rod 28, and the upper and lower ends of the vertical rod 28 are fixedly connected to the inner cavity of the second slide groove, and the outer sides of the two vertical rods 28 are sleeved with a third spring 27, and the upper and lower ends of the third spring 27 are respectively fixedly connected to the second slider and the bottom of the inner cavity of the second slide groove, so as to drive the device to move and improve the flexibility of use.

[0028] Working principle: First, during use, the raw materials to be mixed are added to the inner cavity of the tank body 1 through the feeding hopper 3, and then the three conical filter screens 14 will filter them. The filtered raw materials will enter the inner cavity of the tank body 1. At this time, the drive motor 8 can be started by an external power supply. When the drive motor 8 is working, its output shaft will drive the stirring shaft 9 to rotate. The rotation of the stirring shaft 9 will drive a number of stirring rods 11 to rotate. The rotation of the several stirring rods 11 will stir and mix the raw materials. The mixed raw materials can be collected through the discharge pipe by opening the valve. The top cover 6 can be disassembled during long-term use. In order to facilitate the disassembly and replacement of the conical filter screen 14, the two pull plates 16 are pulled to the opposite side. The movement of the two pull plates 16 to the opposite side will drive the adjacent pull rods 17 to move to the opposite side and squeeze the adjacent second springs 20. At the same time, the two moving blocks 18 will also move to the opposite side under the limit of the limit plate and the square rod 19. The movement of the two moving blocks 18 to the opposite side will drive the movable plate 22 to move to the side away from the top cover 6 under the limit of the first slider and the first slide groove through the adjacent connecting rod 15. The movement of the movable plate 22 will drive the insertion rod 21 to move to the inner cavity away from the slot. When the insertion rods on both sides are 21 are away from the inner cavity of the adjacent slots, the top cover 6 can be disassembled, and then the two latches 7 are pulled to the opposite side, and the two latches 7 are driven to be away from the inner cavity of the adjacent blind hole by the extension of the adjacent first springs 13, and then the fixing frame 12 is moved upward to take out the fixing frame 12, so that the conical filter 14 can be disassembled and replaced, and the new conical filter 14 can be installed by the reverse operation. During use, when it is necessary to drive the device to move, the servo motor 24 is started by an external power supply. When the servo motor 24 is working, its output shaft will drive the transmission rod to rotate, and the rotation of the transmission rod will drive the two active The bevel gear 23 rotates, and the rotation of the active bevel gear 23 drives the driven bevel gear 31 to rotate. The rotation of the two driven bevel gears 31 drives the adjacent worm 25 to rotate. The rotation of the worm 25 drives the worm wheel 26 to rotate. The rotation of the two worm wheels 26 drives the two rotating shafts to rotate. The rotation of the two rotating shafts drives the adjacent cams 30 to rotate. The rotation of the two cams 30 jointly pushes the sliding plate 10 to move downward under the limit of the second slider and the second slide groove, and squeezes the adjacent third spring 27, so that several universal wheels 29 can contact the ground, thereby driving the device to move and improving the flexibility of use.

[0029] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A high-precision batching tank for vaccine production, comprising a tank body (1), the top of the tank body (1) is provided with an opening, the inner cavity of the opening is provided with a fixing frame (12), the inner cavity of the fixing frame (12) is provided with three conical filter screens (14), and the filter apertures on the three conical filter screens (14) decrease from top to bottom, the top of the tank body (1) is provided with a top cover (6), and the bottom of the top cover (6) is provided with an annular pad, characterized in that: A hopper (3) is plugged into the top of the top cover (6), and mounting mechanisms are provided on both the left and right sides of the top cover (6). A rectangular groove (5) is fixedly connected to the left side of the tank body (1) near the bottom, and a driving motor (8) is fixedly connected to the left side of the inner cavity of the rectangular groove (5), and a stirring shaft (9) is fixedly connected to the output shaft of the driving motor (8). First bearings are fixedly connected to the left and right sides of the tank body (1) near the bottom, and the right end of the stirring shaft (9) passes through the adjacent first bearing and is plugged into the inner cavity away from the first bearing, and a plurality of stirring rods (11) are fixedly connected to the outer side of the stirring shaft (9). A discharge pipe is plugged into the bottom of the right side of the tank body (1), and a valve matching the discharge pipe is provided on the outer side of the discharge pipe. A mounting groove (4) is fixedly connected to the bottom of the tank body (1), and a moving mechanism is provided in the inner cavity of the mounting groove (4).

2. A high-precision batching tank for vaccine production as claimed in claim 1, characterized in that: A vertical plate is provided on the opposite side of the fixed frame (12) near the top, and the bottom of the vertical plate is fixedly connected to the tank body (1), and a through hole is provided on the two vertical plates, and a latch (7) is passed through the inner cavity of the two through holes, and a first spring (13) is sleeved on the outer side of the two latches (7), and the two ends of the first spring (13) are respectively fixedly connected to the latch (7) and the vertical plate, and blind holes are provided on the left and right sides of the fixed frame (12) near the top, and the opposite ends of the two latches (7) are respectively inserted into the inner cavity of the adjacent blind holes.

3. A high-precision batching tank for vaccine production as claimed in claim 1, characterized in that: The mounting mechanism comprises a fixing groove (2), the fixing groove (2) being fixedly connected to the right side of the top of the tank body (1), and two moving blocks (18) are arranged near the right side of the inner cavity of the fixing groove (2), the two moving blocks (18) being arranged up and down, the right sides of the two moving blocks (18) are both fixedly connected to a limiting plate, and the limiting plate is provided with a square hole, a square rod (19) is commonly penetrated through the two square holes, and the upper and lower ends of the square rod (19) are both fixedly connected to the inner cavity of the fixing groove (2).

4. A high-precision batching tank for vaccine production as claimed in claim 3, characterized in that: The two opposite sides of the two moving blocks (18) are fixedly connected with a pull rod (17), the top and bottom of the fixed groove (2) are provided with through holes near the right side, the opposite ends of the two pull rods (17) respectively pass through the inner cavity of the adjacent through holes, and are fixedly connected with a pull plate (16), the outer sides of the two pull rods (17) are sleeved with a second spring (20), and the two ends of the second spring (20) are fixedly connected to the moving block (18) and the inner cavity of the fixed groove (2), respectively.

5. A high-precision batching tank for vaccine production as claimed in claim 4, characterized in that: The left sides of the two moving blocks (18) are hinged with connecting rods (15), and a movable plate (22) is provided near the left side of the inner cavity of the fixed groove (2). The ends of the two connecting rods (15) away from the adjacent moving blocks (18) are hinged to the right side of the movable plate (22), and the top and bottom of the movable plate (22) are fixedly connected with first sliders, and the top and bottom of the inner cavity of the fixed groove (2) are provided with first slide grooves, and the two first sliders are movably connected to the inner cavities of adjacent first slide grooves respectively. The left side of the movable plate (22) is fixedly connected with an insertion rod (21), and a slot is provided near the bottom of the right side of the top cover (6), and the left end of the insertion rod (21) is inserted into the inner cavity of the slot.

6. A high-precision batching tank for vaccine production as claimed in claim 1, characterized in that: The moving mechanism comprises two sliding plates (10), wherein the sliding plates (10) are arranged near the bottom of the inner cavity of the installation groove (4), and the bottom of the sliding plates (10) near the four corners are fixedly connected with universal wheels (29), the left and right sides of the sliding plates (10) are fixedly connected with second sliders, the left and right sides of the inner cavity of the installation groove (4) are provided with second slide grooves, and the two second sliders are respectively movably connected to the inner cavities of adjacent second slide grooves, the two second sliders are provided with fixing holes, and the inner cavities of the fixing holes are penetrated by vertical rods (28), the upper and lower ends of the vertical rods (28) are fixedly connected to the inner cavity of the second slide groove, the outer sides of the two vertical rods (28) are sleeved with third springs (27), and the upper and lower ends of the third springs (27) are respectively fixedly connected to the second slider and the bottom of the inner cavity of the second slide groove.

7. A high-precision batching tank for vaccine production as claimed in claim 6, characterized in that: Cams (30) are provided at the top of the sliding plate (10) near the left and right sides, and rotating shafts are fixedly connected at the opposite sides of the two cams (30) near the bottom. The opposite ends of the two rotating shafts are movably connected to the inner cavity of the mounting groove (4). Worm wheels (26) are sleeved on the outer sides of the two rotating shafts, and a worm (25) is meshed on the front side of the worm wheel (26). A transverse plate is fixedly connected to the inner cavity of the mounting groove (4) near the middle position, and a second bearing is fixedly connected to the transverse plate near the left and right sides. The top ends of the two worms (25) respectively penetrate the inner cavities of adjacent second bearings and are fixedly connected to driven cones. The gear (31) is fixedly connected to a protective groove on the right side of the installation groove (4) near the top, and a servo motor (24) is fixedly connected to the right side of the inner cavity of the protective groove, and the output shaft of the servo motor (24) is fixedly connected to a transmission rod, and third bearings are fixedly connected to the inner cavity of the installation groove (4) on both sides near the top, and the left end of the transmission rod passes through the adjacent third bearing and is inserted into the inner cavity away from the third bearing, and the outer side of the transmission rod is fixedly connected to the left and right ends, and the bottoms of the two active bevel gears (23) are respectively meshed with the adjacent driven bevel gears (31).

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