High-temperature alloy surrounding type efficient precise flexible cutting machine tool

Abstract

The invention discloses a high-temperature alloy surrounding type efficient precise flexible cutting machine tool, and relates to the technical field of machining, the high-temperature alloy surrounding type efficient precise flexible cutting machine tool comprises a machine tool body, the surface of the machine tool body is rotatably connected with a protective cover, the interior of the machine tool body is fixedly connected with a moving track, and the surface of the moving track is provided with a tool bit moving assembly; the bottom end of the tool bit moving assembly is fixedly connected with a cutting tool bit, the cutting auxiliary mechanism is arranged in the machine tool body and comprises a connecting disc fixedly connected to the interior of the machine tool body, and three guide grooves are formed in the surface of the connecting disc; and moving frames are slidably connected into the three guide grooves correspondingly, constraint rods are rotatably inserted into the moving frames, and rod-shaped alloy is arranged among the three constraint rods, so that the problem that the rod-shaped alloy is in a high-temperature state in the cutting process, deformation is prone to occurring due to external force, and the cutting precision and quality of the rod-shaped alloy are affected is solved.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and more specifically, to a high-temperature alloy surround-type high-efficiency, precise, and flexible cutting machine tool. Background Technology

[0002] In the machining process of rod-shaped high-temperature alloys, annular groove cutting is performed on the rotating surface using a machine tool. After the workpiece is driven to a high-speed rotation state, the cutting head cuts in. With the advantages of extremely small contact area between the cutting tool and the chip and highly concentrated cutting force, precise control of the cutting process can be achieved, significantly reducing surface roughness and obtaining mirror-level machining quality, thereby comprehensively improving the performance and life of the alloy.

[0003] Because the rod-shaped alloy is in a high-temperature state during processing, and the high-temperature state of the rod-shaped alloy is more flexible than that of the cooled state, and the rod-shaped alloy is also longer, the rod-shaped alloy will twist and deform due to the influence of gravity and the centrifugal force generated during the high-speed rotation of the rod-shaped alloy during the cutting process. Therefore, the rod-shaped alloy may bend after cutting, especially if the cutting part of the rod-shaped alloy is bent, which will affect the accuracy of the cutting and thus affect the cutting quality of the rod-shaped alloy. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide a high-temperature alloy surround-type high-efficiency, precise, and flexible cutting machine tool to solve the problem that the high temperature during the cutting of bar alloys makes them prone to deformation due to external forces, which affects the cutting accuracy and quality of bar alloys.

[0005] To solve the above problems, the present invention adopts the following technical solution: A high-temperature alloy surround-type high-efficiency precision flexible cutting machine tool includes a machine tool body, a protective cover rotatably connected to the surface of the machine tool body, a moving rail fixedly connected inside the machine tool body, a tool head moving assembly mounted on the surface of the moving rail, a cutting tool head fixedly connected to the bottom end of the tool head moving assembly, and a cutting auxiliary mechanism disposed inside the machine tool body. The cutting auxiliary mechanism includes a connecting plate fixedly connected inside the machine tool body, three guide grooves formed on the surface of the connecting plate, a moving frame slidably connected inside each of the three guide grooves, a restraining rod rotatably inserted inside the moving frame, and a rod-shaped alloy disposed between the three restraining rods, with the three restraining rods in close contact with the surface of the rod-shaped alloy.

[0006] Furthermore, a first rotating shaft is rotatably connected inside the machine tool body, a drive disk is fixedly connected to the surface of the first rotating shaft, three arc-shaped grooves are opened on the surface of the drive disk, and guide columns are fixedly connected to the surface of the moving frame. The three guide columns are slidably connected to the interior of the three arc-shaped grooves respectively.

[0007] Furthermore, an external gear ring is fixedly sleeved on the outer arc surface of the drive disk, a first hydraulic rod is fixedly connected inside the machine tool body, a push rod is fixedly connected to the surface of the first hydraulic rod, a rack is fixedly connected to the surface of the push rod, and the rack meshes with the external gear ring.

[0008] Furthermore, the machine tool body has three fixed chucks slidably connected inside, and a hydraulic assembly is installed inside the machine tool body. The hydraulic assembly is used to drive the three fixed chucks to open and close to fix and release the rod-shaped alloy. Pressure plates are fixedly connected to both sides of the three fixed chucks near one end of each other. The six pressure plates form a circular structure that fits against the arc surface of the rod-shaped alloy.

[0009] Furthermore, a second hydraulic rod is fixedly connected inside the machine tool body, and a rear end abutment plate is rotatably connected to the surface of the second hydraulic rod.

[0010] Furthermore, it also includes a post-cutting processing mechanism, which is disposed on the surface of the tool head moving assembly. The post-cutting processing mechanism includes two connecting frames fixedly connected to the surface of the tool head moving assembly, and a chip guide plate is fixedly connected between the two connecting frames.

[0011] Furthermore, side plates are fixedly connected to both sides of the debris guide plate, and the bottom end of the side plates is provided with a cutting edge.

[0012] Furthermore, a cutting plate is inserted inside the debris guide plate, and a movable plate is fixedly connected to the end of the cutting plate away from the debris guide plate. A guide rod is inserted inside the movable plate and fixedly connected to the debris guide plate. A push frame is fixedly connected to the side of the movable plate. A second rotating shaft is rotatably connected to the lower end of the connecting frame. A drive wheel is fixedly sleeved on the surface of the second rotating shaft. The drive wheel is in close contact with the surface of one of the restraining rods. A rotating disk is fixedly sleeved on the surface of the second rotating shaft. A push arm is fixedly connected to the arc surface of the rotating disk. A push wheel is rotatably connected to the end of the push arm away from the rotating disk. A spring is fixedly connected between the movable plate and the debris guide plate.

[0013] Furthermore, a third rotating shaft is rotatably inserted inside the two side plates, and a projectile wheel is fixedly sleeved on the surface of the third rotating shaft.

[0014] Furthermore, both the third and second rotating shafts are fixedly fitted with sprockets, and the two sprockets are connected by a chain drive.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) In this scheme, during the rotation of the rod alloy, the direction and range of deformation of the rod alloy are restricted by three restraining rods to prevent the rod alloy from deforming due to the centrifugal force generated during high-speed rotation, as well as external forces such as gravity and vibration during processing, which would affect the processing quality of the rod alloy.

[0016] (2) In this scheme, during the process of fixing and positioning the rod alloy with three fixed clamps, all six pressure plates are attached to the surface of the rod alloy and wrap the rod alloy to achieve a covered surface fixation. Compared with single-point or multi-point fixation, it has a larger contact area, which can disperse the pressure on the rod alloy when it is under pressure at high temperature and reduce the deformation amplitude of the rod alloy under pressure during the fixing process.

[0017] (3) This solution makes the rear abutment plate and the pressure plate that makes up the ring structure form a cylindrical structure, so that the side that contacts the rear abutment plate will not deform when the rod alloy is subjected to pressure and deforms, further reducing the area of ​​deformation of the rod alloy.

[0018] (4) Since the rod alloy is soft at high temperature, the chips cut off are difficult to break and appear as long strips. Therefore, the chips can be thrown obliquely upward along the direction of the chip guide plate by the chip guide plate, reducing the chips from falling back onto the surface of the rod alloy and re-adhering, thus affecting the surface flatness of the rod alloy.

[0019] (5) This solution cuts the long strips of debris with a cutting plate, which can prevent the debris from being too long and being dragged during the discharge process and sticking to the surface of the rod alloy, thus causing a large number of protrusions on the surface of the rod alloy due to the debris, and further improving the flatness of the surface of the rod alloy.

[0020] (6) In this scheme, after the debris is moved obliquely upward and cut off, the ejector wheel drives the cut-off debris to be thrown out quickly, so as to prevent the debris from sliding down again and sticking to the rod alloy, causing a large number of protrusions to be generated on the surface of the rod alloy due to the debris, thereby further improving the surface flatness of the rod alloy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the main body of the machine tool of the present invention; Figure 3 This is a schematic diagram of the restraint rod portion of the present invention; Figure 4 This is a schematic diagram of the connecting disk portion of the present invention; Figure 5 This is a schematic diagram of the structure of the external gear ring and the rack of the present invention; Figure 6 This is a schematic diagram of the connecting frame portion of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle; Figure 8 This is a schematic diagram of the debris guide plate portion of the present invention; Figure 9 This is a schematic diagram of the structure of the second hydraulic rod part of the present invention.

[0022] Explanation of the labels in the diagram: 1. Machine tool body; 2. Protective cover; 301. Moving track; 302. Cutter head moving assembly; 303. Restraining rod; 304. Connecting plate; 305. Guide groove; 306. Moving frame; 307. Guide column; 308. Drive plate; 309. External gear ring; 310. First rotating shaft; 311. Arc groove; 312. First hydraulic rod; 313. Rack; 314. Push rod; 315. Cutting head; 401. Connecting frame; 402. Side plate; 403. Chain; 404. Drive wheel; 405. Sprocket; 406. Debris guide plate; 407. Rotating disk; 408. Second rotating shaft; 409. Push frame; 410. Push arm; 411. Push wheel; 412. Cutting plate; 413. Guide rod; 414. Spring; 415. Projectile wheel; 416. Moving plate; 417. Third rotating shaft; 501. Fixed clamp; 502. Second hydraulic rod; 503. Rear end abutment plate; 504. Pressure plate. 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] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 9A high-temperature alloy surround-type high-efficiency precision flexible cutting machine tool includes a machine tool body 1. A protective cover 2 is rotatably connected to the surface of the machine tool body 1. A moving track 301 is fixedly connected inside the machine tool body 1. A tool head moving assembly 302 is mounted on the surface of the moving track 301. A cutting tool head 315 is fixedly connected to the bottom end of the tool head moving assembly 302. The machine tool body also includes a cutting auxiliary mechanism located inside the machine tool body 1. The cutting auxiliary mechanism includes a connecting plate 304 fixedly connected inside the machine tool body 1. Three guide grooves 305 are formed on the surface of the connecting plate 304. A moving frame 306 is slidably connected inside each of the three guide grooves 305. A restraining rod 303 is rotatably inserted inside the moving frame 306. The three restraining rods 303 are connected to each other. A rod-shaped alloy is provided between the components, and the three binding rods 303 are all in close contact with the surface of the rod-shaped alloy. A first rotating shaft 310 is rotatably connected inside the machine tool body 1. A drive disk 308 is fixedly connected to the surface of the first rotating shaft 310. Three arc-shaped grooves 311 are opened on the surface of the drive disk 308. A guide post 307 is fixedly connected to the surface of the moving frame 306. The three guide posts 307 are slidably connected to the interior of the three arc-shaped grooves 311 respectively. An external gear ring 309 is fixedly sleeved on the outer arc surface of the drive disk 308. A first hydraulic rod 312 is fixedly connected inside the machine tool body 1. A push rod 314 is fixedly connected to the surface of the first hydraulic rod 312. A rack 313 is fixedly connected to the surface of the push rod 314. The rack 313 meshes with the external gear ring 309.

[0025] The machine tool body 1 has three fixed chucks 501 slidably connected inside. A hydraulic assembly is installed inside the machine tool body 1. The hydraulic assembly is used to drive the three fixed chucks 501 to open and close to fix and release the rod-shaped alloy. Each of the three fixed chucks 501 has a pressure plate 504 fixedly connected to both sides of one end. The six pressure plates 504 form a circular structure that fits against the arc surface of the rod-shaped alloy. A second hydraulic rod 502 is fixedly connected inside the machine tool body 1. A rear end abutment plate 503 is rotatably connected to the surface of the second hydraulic rod 502.

[0026] By adopting the above technical solution, when machining the rod-shaped alloy, the rod-shaped alloy needs to be placed between three restraining rods 303, with one end of the rod-shaped alloy positioned between three fixed clamps 501. Then, the three fixed clamps 501 are driven by a hydraulic assembly to move towards each other, thereby fixing the rod-shaped alloy. This is a common method in the prior art and will not be elaborated further here. During the process of fixing and positioning the rod-shaped alloy with the three fixed clamps 501, all six pressure plates 504 fit with the surface of the rod-shaped alloy and wrap around it, achieving a covered surface fixation. Compared with single-point or multi-point fixation methods, this provides a larger contact area, thereby dispersing the pressure on the rod-shaped alloy under high temperature and reducing the deformation amplitude of the rod-shaped alloy under pressure during the fixing process. Subsequently, the second hydraulic rod 502 pushes the rear abutment plate 503 to move closer to the rod-shaped alloy, so that the rear abutment plate 503 abuts against the rod-shaped alloy. This allows the rear abutment plate 503 and the pressure plate 504 forming the annular structure to form a cylindrical structure. This ensures that the side of the rear abutment plate 503 in contact with the rod-shaped alloy does not deform after the rod-shaped alloy is subjected to pressure, further reducing the area of ​​deformation of the rod-shaped alloy.

[0027] After the rod-shaped alloy is fixed, the fixed chuck 501 and the rod-shaped alloy are driven to rotate at high speed by the power mechanism inside the machine tool body 1. Then, the cutting head 315 is moved laterally by the tool head moving assembly 302 to adjust the position of the cutting head 315. Then, the cutting head 315 is moved downward to adjust the cutting depth of the cutting head 315 on the rod-shaped alloy, so that the rod-shaped alloy can be cut. This is a common method in the prior art and will not be described in detail here. During the cutting of the rod-shaped alloy, the first hydraulic rod 312 drives the push rod 314 and the rack 313 to move, which in turn drives the outer gear ring 309 and the drive disk 308 to rotate. During the rotation of the drive disk 308, the arc groove 311 guides and drives the three moving frames 306 to move the three restraining rods 303 towards each other until the three restraining rods 303 contact the surface of the rod-shaped alloy. During the rotation of the rod-shaped alloy, the three restraining rods 303 limit the direction and range of deformation of the rod-shaped alloy, preventing the rod-shaped alloy from deforming due to centrifugal force, gravity, and vibration generated during high-speed rotation, thus affecting the processing quality of the rod-shaped alloy.

[0028] like Figure 6 , Figure 7 and Figure 8As shown, it also includes a post-cutting processing mechanism, which is disposed on the surface of the cutter head moving assembly 302. The post-cutting processing mechanism includes two connecting frames 401 fixedly connected to the surface of the cutter head moving assembly 302. A chip guide plate 406 is fixedly connected between the two connecting frames 401. Side plates 402 are fixedly connected to both sides of the chip guide plate 406. A cutting edge is provided at the bottom end of the side plate 402. The cutting edge of the side plate 402 can cut off the chips adhering to the side to prevent affecting the discharge of chips.

[0029] The debris guide plate 406 has a cutting plate 412 inserted inside. A movable plate 416 is fixedly connected to the end of the cutting plate 412 away from the debris guide plate 406. A guide rod 413 is inserted inside the movable plate 416 and fixedly connected to the debris guide plate 406. A pusher frame 409 is fixedly connected to the side of the movable plate 416. A second rotating shaft 408 is rotatably connected to the lower end of the connecting frame 401. A drive wheel 404 is fixedly sleeved on the surface of the second rotating shaft 408, and the drive wheel 404 is in close contact with the surface of one of the restraining rods 303. A rotating disk 407 is fixedly sleeved on the surface of the second rotating shaft 408. A push arm 410 is fixedly connected to the arc surface of the disc 407. A push wheel 411 is rotatably connected to the end of the push arm 410 away from the rotating disc 407. The push wheel 411 can reduce the wear on the push frame 409 during multiple contacts. A spring 414 is fixedly connected between the moving plate 416 and the chip guide plate 406. When the cutting plate 412 is close to the cutting head 315, the spring 414 is in a compressed state. When the drive wheel 404 passes the push frame 409 without contacting the push frame 409, the spring 414 rebounds and drives the cutting plate 412 and the push frame 409 back to their original positions so that the next cutting step can be repeated, realizing the reciprocating movement of the cutting plate 412.

[0030] Among them, a third rotating shaft 417 is rotatably inserted inside the two side plates 402, a projectile wheel 415 is fixedly sleeved on the surface of the third rotating shaft 417, and a sprocket 405 is fixedly sleeved on the surface of both the third rotating shaft 417 and the second rotating shaft 408, and the two sprockets 405 are connected by a chain 403.

[0031] By adopting the above technical solution, during the cutting process of the rod-shaped alloy, since the rod-shaped alloy is in a high temperature state and the overall material is relatively soft, the cut chips are difficult to break and appear as long strips. Therefore, the chips can be guided by the chip guide plate 406 to be thrown obliquely upward along the direction of the chip guide plate 406, reducing the chips from falling back onto the surface of the rod-shaped alloy and re-adhering, thus affecting the surface flatness of the rod-shaped alloy. During the cutting of the rod-shaped alloy, the rod-shaped alloy rotates at high speed, driving the drive wheel 404 to rotate, which in turn drives the rotating disk 407 and the push arm 410 to rotate. This, in turn, drives the push frame 409 to move, causing the cutting plate 412 to pass through the chip guide plate 406 until it abuts against the surface of the cutting head 315. This cuts off long strips of chip, preventing excessively long chips from being dragged during discharge and sticking to the surface of the rod-shaped alloy, thus further improving the surface flatness of the rod-shaped alloy. When the cutting plate 412 approaches the cutting head 315, the spring 414 is in a compressed state. When the drive wheel 404 passes the push frame 409 without contacting it, the spring 414 rebounds, causing the cutting plate 412 and the push frame 409 to return to their original positions, so that the next cutting step can be repeated. This achieves the reciprocating movement of the cutting plate 412 and the repeated cutting of chips.

[0032] As the debris moves obliquely upward, it moves between the ejector wheel 415 and the debris guide plate 406. While the drive wheel 404 rotates, the power is transmitted through the chain 403 and two sprockets 405 to drive the ejector wheel 415 to rotate. After the debris is cut off, the ejector wheel 415 can quickly eject the cut-off debris to prevent it from sliding down again and sticking to the rod-shaped alloy, thereby further improving the surface flatness of the rod-shaped alloy.

[0033] Instructions for use: First, place the rod-shaped alloy between the three restraint rods 303, with one end of the rod-shaped alloy positioned between the three fixing clamps 501; Next, the three fixed clamps 501 are driven by the hydraulic components to fix the rod-shaped alloy. Subsequently, the second hydraulic rod 502 pushes the rear abutment plate 503 to abut against the rod-shaped alloy; Subsequently, the fixed chuck 501 and the rod-shaped alloy are driven to rotate at high speed by the power mechanism inside the machine tool body 1. Subsequently, the cutting head 315 is moved by the cutting head moving assembly 302 to adjust its position and the cutting depth of the rod-shaped alloy, thereby cutting the rod-shaped alloy; Next, the three restraint rods 303 are driven to contact the surface of the rod-shaped alloy by the first hydraulic rod 312; At the same time, the cut debris is thrown obliquely upward along the direction of the debris guide plate 406; At the same time, the cutting board 412 cuts the long strips of debris to prevent the debris from becoming too long; Next, the debris moves between the ejector wheel 415 and the debris guide plate 406; Finally, the debris is rapidly ejected by the ejector wheel 415.

[0034] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A high-temperature alloy surround-type high-efficiency precision flexible cutting machine tool, comprising a machine tool body (1), a protective cover (2) rotatably connected to the surface of the machine tool body (1), a moving track (301) fixedly connected inside the machine tool body (1), a tool head moving assembly (302) mounted on the surface of the moving track (301), and a cutting tool head (315) fixedly connected to the bottom end of the tool head moving assembly (302), characterized in that: Also include cutting auxiliary mechanism, cutting auxiliary mechanism is arranged in the inside of machine tool body (1), cutting auxiliary mechanism includes the connecting disc (304) fixedly connected to the inside of machine tool body (1), the surface of connecting disc (304) is equipped with three guide grooves (305), the inside of three guide grooves (305) is slidably connected with moving frame (306), the inside of moving frame (306) is rotatably inserted with restraint rod (303), three restraint rods (303) are provided with bar alloy between, three restraint rods (303) are all close to the surface of bar alloy.

2. The high-temperature alloy encircling high-efficiency precision flexible cutting machine tool of claim 1, wherein: The inside of machine tool body (1) is rotatably connected with first rotation shaft (310), the surface of first rotation shaft (310) is fixedly connected with driving disc (308), the surface of driving disc (308) is equipped with three arc grooves (311), the surface of moving frame (306) is fixedly connected with guide column (307), three guide columns (307) are slidably connected with the inside of three arc grooves (311) respectively.

3. The high-temperature alloy encircling high-efficiency precision flexible cutting machine tool of claim 2, wherein: The outer circular arc surface of driving disc (308) is fixedly provided with outer gear ring (309), the inside of machine tool body (1) is fixedly connected with first hydraulic rod (312), the surface of first hydraulic rod (312) is fixedly connected with advancing rod (314), the surface of advancing rod (314) is fixedly connected with rack (313), rack (313) is engaged with outer gear ring (309).

4. The high-temperature alloy encircling high-efficiency precision flexible cutting machine tool of claim 1, wherein: The inside of machine tool body (1) is slidably connected with three fixed chucks (501), the inside of machine tool body (1) is installed with hydraulic assembly, the hydraulic assembly is used to drive three fixed chucks (501) to open and close to realize the fixation and loosening of bar alloy, both sides of one end of three fixed chucks (501) close to each other are fixedly connected with pressing plate (504), six pressing plates (504) form the circular structure that is fitted with the circular arc surface of bar alloy.

5. The high-temperature alloy encircled high-efficiency precision flexible cutting machine tool of claim 4, wherein: The inside of machine tool body (1) is fixedly connected with second hydraulic rod (502), the surface of second hydraulic rod (502) is rotatably connected with rear end abutment disc (503).

6. The high-temperature alloy encircled high-efficiency precision flexible cutting machine tool of claim 1, wherein: Also include cutting post-processing mechanism, cutting post-processing mechanism is arranged on the surface of tool bit moving assembly (302), cutting post-processing mechanism includes two connecting frames (401) fixedly connected to the surface of tool bit moving assembly (302), two connecting frames (401) are fixedly connected with scrap guide plate (406) between.

7. The high-temperature alloy encircling high-efficiency precision flexible cutting machine tool of claim 6, wherein: Both sides of scrap guide plate (406) are fixedly connected with side plate (402), the bottom end of side plate (402) is equipped with cutting edge.

8. The high-temperature alloy encircled high-efficiency precision flexible cutting machine tool of claim 6, wherein: The inside of the scrap guide plate (406) is inserted with a cutting plate (412), one end of the cutting plate (412) away from the scrap guide plate (406) is fixedly connected with a moving plate (416), the inside of the moving plate (416) is inserted with a guide rod (413), the guide rod (413) is fixedly connected with the scrap guide plate (406), the side of the moving plate (416) is fixedly connected with a push frame (409), the lower end of the connecting frame (401) is rotatably connected with a second rotating shaft (408), the surface of the second rotating shaft (408) is fixedly sleeved with a driving wheel (404), the driving wheel (404) is close to the surface of one of the constraint rods (303), the surface of the second rotating shaft (408) is fixedly sleeved with a rotating disc (407), the arc surface of the rotating disc (407) is fixedly connected with a push arm (410), one end of the push arm (410) away from the rotating disc (407) is rotatably connected with a push wheel (411), the moving plate (416) and the scrap guide plate (406) are fixedly connected with a spring (414).

9. The high-temperature alloy encircled high-efficiency precision flexible cutting machine tool of claim 7, wherein: The inside of the two side plates (402) is rotatably inserted with a third rotating shaft (417), the surface of the third rotating shaft (417) is fixedly sleeved with a throwing wheel (415).

10. The high-temperature alloy encircled high-efficiency precision flexible cutting machine tool of claim 9, wherein: The surface of the third rotating shaft (417) and the second rotating shaft (408) is fixedly sleeved with a chain wheel (405), the two chain wheels (405) are drivingly connected through a chain (403).

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