A plate straightening device

Abstract

The application discloses a plate straightening device, relates to the technical field of steel plate processing, and is used for straightening a steel plate. The plate straightening device comprises an operation platform, a mounting block is slidably arranged in the operation platform, a clamping assembly for clamping the steel plate is arranged on the mounting block, the steel plate clamped by the clamping assembly sequentially passes through a straightening area, a cooling area and a lubricating area arranged in the operation platform, at least two rows of straightening rollers are arranged in the straightening area of the operation platform from top to bottom, horizontal channels for extruding the steel plate are formed between the upper and lower straightening rollers, and the cooling area and the lubricating area of the operation platform are respectively provided with a cooling assembly for cooling the steel plate and a lubricating assembly for smearing lubricating oil on the surface of the steel plate. The plate straightening device can effectively guarantee the quality of the processed steel plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel plate processing, and particularly to a plate flattening device. BACKGROUND

[0002] The plate flattening device is a device or apparatus for flattening metal plates. In the production and processing of metal plates, due to the characteristics of the material itself or stress changes in the processing process, the metal plates may be bent, warped, and the like, which affects the flatness and processing quality of the steel plates. The function of the plate flattening device is to apply appropriate force and control the movement of the flattening rollers to correct the metal plates and restore them to a flat state.

[0003] At present, the plate flattening device usually includes flattening rollers, roller seats, a transmission system, a control system, and the like. The flattening rollers are the most critical components in the device, which are usually composed of multiple rollers that move synchronously through the transmission system to achieve the flattening effect on the plates.

[0004] In the extrusion flattening process, the steel plates generate heat due to the extrusion force and friction. High temperature can cause the steel plates to deform or lose their original physical properties, and friction between the steel plates and the flattening rollers can easily cause surface unevenness, scratches, and oxidation, and the like, thus resulting in low quality of the processed steel plates. SUMMARY

[0005] The present application provides a plate flattening device that can effectively ensure the quality of the processed steel plates.

[0006] The plate flattening device provided by the present application adopts the following technical solution:

[0007] A plate flattening device for flattening steel plates includes an operation platform, a mounting block slidingly arranged in the operation platform, a clamping assembly for clamping the steel plates arranged on the mounting block, the steel plates clamped by the clamping assembly sequentially passing through a flattening area, a cooling area, and a lubricating area arranged in the operation platform, at least two rows of flattening rollers arranged in the flattening area of the operation platform from top to bottom, a horizontal channel for extruding the steel plates being formed between the two rows of flattening rollers, and a cooling assembly for cooling the steel plates and a lubricating assembly for applying lubricating oil to the surface of the steel plates arranged in the cooling area and the lubricating area of the operation platform, respectively.

[0008] By adopting the above technical solution, the steel plate is firmly fixed to the clamping assembly by using a clamping component, ensuring that the steel plate will not slip or shift during the leveling process. This ensures the accuracy and stability of the leveling operation, avoiding unnecessary deformation or damage to the steel plate during leveling, and obtaining a leveled steel plate. The cooling component effectively reduces the temperature of the leveled steel plate, ensuring that it maintains a suitable temperature range during extrusion, avoiding unnecessary deformation and quality problems. Moreover, the lubrication component effectively fills the tiny unevenness on the surface of the steel plate with lubricating oil, forming a lubricating film on the surface of the steel plate, making the surface of the steel plate smoother, preventing oxygen from entering, reducing the degree of oxidation of the steel plate, and maintaining the surface smoothness and quality of the steel plate; thus ensuring the quality of the steel plate after processing.

[0009] Preferably, the operating platform is equipped with a first drive motor and a slide rod inside, the output end of the first drive motor is connected to a lead screw, and both the slide rod and the lead screw pass through the interior of the mounting block.

[0010] By adopting the above technical solution, the first drive motor is started, causing the lead screw to rotate and the mounting block to slide on the slide bar, which drives the steel plate clamped on the mounting block. During the leveling process of the steel plate, the lead screw drive can stably transmit force and movement, ensuring the flatness and leveling effect of the steel plate.

[0011] Preferably, the clamping assembly includes a limiting block disposed on the mounting block. The limiting block is provided with a clamping base plate and a fixing base plate. A clamping area for clamping one side of the steel plate is formed between the fixing base plate and the clamping base plate. The fixing base plate has a plurality of through holes inside. A clamping rod is disposed in the through holes of the fixing base plate. A spring is disposed on the outside of the clamping rod. The two ends of the spring are respectively connected to the inner wall of the through hole of the fixing base plate. One end of the clamping rod faces the clamping area and is connected to the surface of the steel plate. The other end of the clamping rod is provided with a pressure-applying element.

[0012] By adopting the above technical solution, one side of the steel plate is placed in the clamping area and abuts against one side wall of the limiting block. The clamping rod slides in the through hole through the pressure-applying component until one end of the clamping rod abuts against one side of the steel plate. By reducing the distance between the clamping rod and the clamping base plate, the one side of the steel plate is fixed, which can effectively ensure the stability of the steel plate during movement.

[0013] Preferably, the pressure-applying component includes a fixed block and a sliding groove disposed on the limiting block. A pressure plate is slidably disposed in the sliding groove of the limiting block. One side of the pressure plate contacts the other end of the clamping rod. A threaded rod is disposed on the other side of the pressure plate, and the threaded rod passes through the interior of the fixed block.

[0014] By adopting the above technical solution, the steel plate can be firmly fixed in the required position by rotating the threaded rod to push the pressure plate, and the position and force of the pressure plate can be adjusted quickly and easily to fix and loosen the steel plate.

[0015] Preferably, the operating platform is provided with a guide plate inside, the guide plate spans the cooling area and the lubrication area, and the upper surface of the guide plate is flush with the lower side wall of the horizontal channel.

[0016] By adopting the above technical solution, the guide plate can effectively provide an operating area for the leveled steel plate, facilitating its support.

[0017] Preferably, the cooling assembly includes a condenser and a second drive motor, the output end of the second drive motor is connected to a fan blade, the air outlet of the condenser is located below the fan blade, and the fan blade is located above the guide plate.

[0018] By adopting the above technical solution, the cool air generated by the condenser blown by the fan can enhance air circulation on the surface of the steel plate, thereby improving heat dissipation efficiency. The blowing of cool air can quickly remove heat from the surface of the steel plate, allowing the steel plate to dissipate heat more quickly and lower its temperature. This helps prevent the steel plate from overheating and causing deformation or damage.

[0019] Preferably, the cooling area of ​​the operating platform is provided with an air guide shroud, the bottom of the air guide shroud is provided with a rectangular air outlet, and the air outlet end of the condenser faces the rectangular air outlet.

[0020] By adopting the above technical solution, the air guide can guide the airflow generated by the fan towards the surface of the steel plate, making the airflow more concentrated and orderly. The rectangular air outlet helps to effectively blow the cool air to the surface of the steel plate, enhancing the heat dissipation effect.

[0021] Preferably, the lubrication assembly includes a drive roller rotatably disposed within the operating platform and a storage tank for storing lubricating oil. The top of the storage tank is provided with an oil inlet, the bottom of the storage tank is provided with an oil outlet, and the lower surface of the storage tank is provided with a sponge block for absorbing the lubricating oil in the oil outlet. The surface of the drive roller is provided with a rubber block.

[0022] By adopting the above technical solution, the rotation of the drive roller causes the rubber block and the sponge block to be squeezed. After squeezing the sponge block, the lubricating oil adsorbed in the sponge block is released, and the lubricating oil can adhere to the surface of the rubber block. With the rotation of the drive roller, the lubricating oil adhering to the rubber block covers the surface of the steel plate and forms a lubricating film on the surface of the steel plate. The lubricating film can reduce the direct contact between the steel plate and other friction surfaces, reduce the coefficient of friction, and thus reduce wear and the generation of frictional heat.

[0023] Preferably, the storage box is equipped with a piston inside, the piston is slidably disposed inside the storage box, and a connecting rod is provided on one side of the piston, the connecting rod passing through the interior of the storage box.

[0024] By adopting the above technical solution, the piston moves back and forth in the storage tank, allowing the lubricating oil in the storage tank to intermittently pass through the oil outlet and soak into the sponge block, thus achieving the function of continuous output of lubricating oil.

[0025] Preferably, the output end of the second drive motor is connected to a first turntable, and a second turntable is provided at the top of the fan blade and near its center. A connecting shaft is provided between the first turntable and the second turntable. The connecting shaft is eccentrically positioned with respect to the first turntable. A connecting rod is provided between the connecting shaft and the connecting rod. The connecting rod is rotatably positioned with respect to both the connecting shaft and the connecting rod.

[0026] By adopting the above technical solution, the first turntable is driven by the second drive motor. On the one hand, the second turntable is connected to enable the fan to operate normally. On the other hand, the connecting rod is connected to perform intermittent linkage to drive the piston to extend and retract in the storage tank. This saves energy and reduces emissions, has a good linkage effect, and makes it easy to ensure the continuity of steel plate processing.

[0027] In summary, this application has the following beneficial effects:

[0028] 1. By using clamping components to hold the steel plate, it is firmly fixed to the clamping components, ensuring that the steel plate will not slip or shift during the leveling process. This ensures the accuracy and stability of the leveling operation, avoiding unnecessary deformation or damage to the steel plate during leveling, and obtaining a leveled steel plate. The cooling components effectively reduce the temperature of the leveled steel plate, ensuring that it maintains a suitable temperature range during extrusion, avoiding unnecessary deformation and quality problems. Moreover, the lubrication components effectively fill the tiny unevenness of the steel plate surface with lubricating oil, forming a lubricating film on the surface of the steel plate, making the surface of the steel plate smoother, preventing oxygen from entering, reducing the degree of oxidation of the steel plate, and maintaining the surface smoothness and quality of the steel plate; thus ensuring the quality of the steel plate after processing. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the plate leveling device in this embodiment;

[0030] Figure 2 This is a schematic diagram of the internal structure of the clamping component in this embodiment;

[0031] Figure 3 This is a schematic diagram of the overall structure of the leveling roller in this embodiment;

[0032] Figure 4This is a schematic diagram of the internal structure of the cooling component in this embodiment;

[0033] Figure 5 This is a schematic diagram of the overall structure of the air guide shroud in this embodiment;

[0034] Figure 6 This is an overall cross-sectional view of the storage box in this embodiment;

[0035] Explanation of reference numerals in the attached drawings: 1. Operating platform; 2. Mounting block; 3. First drive motor; 4. Lead screw; 5. Slide rod; 6. Clamping assembly; 601. Limiting block; 602. Clamping base plate; 603. Fixed base plate; 604. Clamping rod; 605. Spring; 606. Pressure applying component; 60601. Fixed block; 60602. Slide groove; 60603. Pressure plate; 60604. Threaded rod; 7. Leveling roller; 8. Cooling... 801. Condenser; 802. Second drive motor; 803. Fan blade; 804. Air guide cover; 9. Lubrication assembly; 901. Drive roller; 902. Storage tank; 903. Oil inlet; 904. Oil outlet; 905. Sponge block; 906. Rubber block; 10. Guide plate; 11. Piston; 12. Connecting rod; 13. First turntable; 14. Second turntable; 15. Connecting shaft; 16. Linkage rod. Detailed Implementation

[0036] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0037] This invention discloses a plate leveling device, such as... Figure 1 and Figure 2As shown, a device for leveling steel plates includes an operating platform 1, with a mounting block 2 slidably mounted inside the operating platform 1. The operating platform 1 also contains a first drive motor 3 and a sliding rod 5. The output end of the first drive motor 3 is connected to a lead screw 4. Both the sliding rod 5 and the lead screw 4 pass through the interior of the mounting block 2. By starting the first drive motor 3, the lead screw 4 rotates, causing the mounting block 2 to slide on the sliding rod 5, thereby driving the steel plate clamped on the mounting block 2. During the leveling process of the steel plate, the lead screw 4 transmission can stably transmit force and movement, ensuring the flatness and leveling effect of the steel plate. The mounting block 2 is provided with a clamping assembly 6 for clamping a steel plate. The clamping assembly 6 includes a limiting block 601 on the mounting block 2. The limiting block 601 is provided with a clamping base plate 602 and a fixing base plate 603. A clamping area for clamping one side of the steel plate is formed between the fixing base plate 603 and the clamping base plate 602. The fixing base plate 603 has a plurality of through holes inside. A clamping rod 604 is provided in the through holes of the fixing base plate 603. A spring 605 is provided on the outside of the clamping rod 604. The two ends of the spring 605 are respectively connected to the inner wall of the through holes of the fixing base plate 603. One end of the clamping rod 604 faces the clamping area and is connected to the surface of the steel plate. The other end of the clamping rod 604 is provided with a pressure-applying component 606. By placing one side of the steel plate in the clamping area and abutting against one side wall of the limiting block 601, and by using the pressure-applying component 606, the clamping rod 604 slides in the through hole until one end of the clamping rod 604 abuts against one side of the steel plate. By reducing the distance between the clamping rod 604 and the clamping base plate 602, the one side of the steel plate is fixed, which can effectively ensure the stability of the steel plate during movement. The pressure-applying component 606 includes components provided on the limiting block 601. The device includes a fixing block 60601 and a sliding groove 60602. A pressure plate 60603 is slidably provided in the sliding groove 60602 of the limiting block 601. One side of the pressure plate 60603 contacts the other end of the clamping rod 604. A threaded rod 60604 is provided on the other side of the pressure plate 60603. The threaded rod 60604 passes through the interior of the fixing block 60601. By rotating and pushing the pressure plate 60603 through the threaded rod 60604, the steel plate can be firmly fixed in the required position. The position and force of the pressure plate 60603 can be adjusted quickly and easily to fix and release the steel plate.

[0038] like Figure 3As shown, the steel plate held by the clamping assembly 6 passes sequentially through the leveling area, cooling area, and lubrication area provided within the operating platform 1. The leveling area of ​​the operating platform 1 has at least two rows of leveling rollers 7 arranged from top to bottom, forming a horizontal channel between the upper and lower rows of leveling rollers 7 for pressing the steel plate. Each leveling roller 7 includes a drive motor and several drive rollers. One end of each drive roller has a rotating shaft, and a belt is attached to the outer side of each rotating shaft. A third drive motor is located on the operating platform 1, and its output end is connected to any rotating shaft. By starting the power supply of the third drive motor, the rotating shaft rotates, and the belt causes the drive rollers to rotate, thereby pressing the surface of the steel plate to achieve the function of leveling the steel plate. The cooling area and lubrication area of ​​the operating platform 1 are respectively provided with a cooling assembly 8 for cooling the steel plate and a lubrication assembly 9 for applying lubricating oil to the surface of the steel plate. By using the clamping assembly 6 to clamp the steel plate, the steel plate is pressed... The steel plate is firmly fixed to the clamping assembly 6, ensuring that it will not slip or shift during the leveling process. This ensures the accuracy and stability of the leveling operation, preventing unnecessary deformation or damage to the steel plate during leveling. The cooling assembly 8 effectively lowers the temperature of the leveled steel plate, ensuring it maintains a suitable temperature range during extrusion, avoiding unnecessary deformation and quality problems. It also rapidly reduces the temperature of the steel plate, minimizing stress concentration and improving its overall performance. Furthermore, the lubrication assembly 9 effectively fills the tiny irregularities on the steel plate surface with lubricating oil, forming a lubricating film that makes the surface smoother, prevents oxygen from entering, reduces oxidation, and maintains surface smoothness and quality. Applying lubricating oil effectively reduces the coefficient of friction, improves the surface quality of the steel plate, and reduces defects.

[0039] In summary, by cooling and applying lubricating oil, temperature can be controlled, stress reduced, surface quality improved, and the lifespan of steel plates extended, thereby ensuring the quality of the processed steel plates.

[0040] like Figure 3 As shown, the operating platform 1 is equipped with a guide plate 10 inside. The guide plate 10 spans the cooling area and the lubrication area. The upper surface of the guide plate 10 is flush with the lower side wall of the horizontal channel. The guide plate 10 can effectively provide an operating area for the leveled steel plate and facilitate the support of the steel plate.

[0041] like Figure 4As shown, the cooling assembly 8 includes a condenser 801 and a second drive motor 802. The output end of the second drive motor 802 is connected to a fan blade 803. The air outlet of the condenser 801 is located below the fan blade 803, and the fan blade 803 is located above the guide plate 10. The cold air generated by the condenser 801 blown by the fan can enhance the air circulation on the surface of the steel plate, thereby improving the heat dissipation efficiency. The blowing of the cold air can quickly remove the heat from the surface of the steel plate, allowing the steel plate to dissipate heat more quickly and reduce the temperature. This helps to prevent the steel plate from overheating and causing deformation or damage. A guide shroud 804 is provided in the cooling area of ​​the operating platform 1. The bottom of the guide shroud 804 is provided with a rectangular air outlet, and the air outlet of the condenser 801 faces the rectangular air outlet. The guide shroud 804 can guide the airflow generated by the fan to be discharged towards the surface of the steel plate, making the airflow more concentrated and orderly. The rectangular air outlet helps to effectively blow the cold air to the surface of the steel plate, enhancing the heat dissipation effect.

[0042] like Figure 5 and Figure 6 As shown, the lubrication assembly 9 includes a drive roller 901 rotatably mounted within the operating platform 1 and a storage tank 902 for storing lubricating oil. The top of the storage tank 902 has an oil inlet 903, and the bottom has an oil outlet 904. A sponge block 905 is provided on the lower surface of the storage tank 902 to absorb the lubricating oil from the oil outlet 904. A rubber block 906 is provided on the surface of the drive roller 901. The rotation of the drive roller 901 causes compression between the rubber block 906 and the sponge block 905. This compression releases the lubricating oil absorbed within the sponge block 905, allowing the lubricating oil to adhere to the surface of the rubber block 906. The rotation of roller 901 causes the lubricating oil adhering to rubber block 906 to cover the surface of the steel plate, forming a lubricating film on the surface of the steel plate. The lubricating film can reduce the direct contact between the steel plate and other friction surfaces, reduce the coefficient of friction, and thus reduce wear and the generation of frictional heat. A piston 11 is provided inside the storage box 902. The piston 11 is slidably disposed in the storage box 902. A connecting rod 12 is provided on one side of the piston 11, and the connecting rod 12 passes through the interior of the storage box 902. By moving the piston 11 back and forth in the storage box 902, the lubricating oil in the storage box 902 can intermittently pass through the oil outlet 904 and wet the sponge block 905, so as to achieve the function of continuous output of lubricating oil.

[0043] like Figure 5As shown, the output end of the second drive motor 802 is connected to the first turntable 13. The top of the fan blade 803 and near its center is provided with the second turntable 14. A connecting shaft 15 is provided between the first turntable 13 and the second turntable 14. The connecting shaft 15 is eccentrically positioned with respect to the first turntable 13. A connecting rod 16 is provided between the connecting shaft 15 and the connecting rod 12. The connecting rod 16 is rotatably positioned with respect to both the connecting shaft 15 and the connecting rod 12. The second drive motor 802 drives the first turntable 13, which on the one hand drives the second turntable 14 to make the fan run normally, and on the other hand drives the connecting rod 16 to perform intermittent linkage to drive the piston 11 to extend and retract within the storage tank 902. This achieves energy saving and emission reduction, has a good linkage effect, and easily ensures the continuity of steel plate processing.

[0044] Working principle: When in use, the user first places the steel plate on the clamping assembly 6, and then starts the first drive motor 3. Under the action of the first drive motor 3, the lead screw 4 rotates to drive the steel plate to move. When the steel plate passes through the horizontal channel, the upper and lower rows of leveling rollers 7 apply pressure to the two sides of the steel plate to achieve the leveling effect of the steel plate.

[0045] When the steel plate enters the cooling zone, the condenser 801 and the fan work together to rapidly cool the steel plate. When the steel plate enters the lubrication zone, the rotation of the drive roller 901 causes the rubber block 906 and the sponge block 905 to be squeezed. After squeezing the sponge block 905, the lubricating oil adsorbed in the sponge block 905 is released, and the lubricating oil can adhere to the surface of the rubber block 906. With the rotation of the drive roller 901, the lubricating oil adhering to the rubber block 906 covers the surface of the steel plate and forms a lubricating film on the surface of the steel plate. The lubricating film can reduce the direct contact between the steel plate and other friction surfaces, reduce the coefficient of friction, and thus reduce wear and the generation of frictional heat.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A plate leveling device for leveling steel plates, comprising an operating platform (1), characterized in that: The operating platform (1) is slidably provided with an installation block (2), and the installation block (2) is provided with a clamping component (6) for clamping the steel plate. The steel plate clamped by the clamping component (6) passes through the leveling area, cooling area and lubrication area provided in the operating platform (1) in sequence. The leveling area of ​​the operating platform (1) is provided with at least two rows of leveling rollers (7) from top to bottom, and a horizontal channel for squeezing the steel plate is formed between the upper and lower rows of leveling rollers (7). The cooling area and lubrication area of ​​the operating platform (1) are respectively provided with a cooling component (8) for cooling the steel plate and a lubrication component (9) for applying lubricating oil to the surface of the steel plate. The lubrication assembly (9) includes a drive roller (901) rotatably disposed in the operating platform (1) and a storage tank (902) for storing lubricating oil. The top of the storage tank (902) is provided with an oil inlet (903), the bottom of the storage tank (902) is provided with an oil outlet (904), the lower surface of the storage tank (902) is provided with a sponge block (905), the sponge block (905) is used to absorb the lubricating oil in the oil outlet (904), and the surface of the drive roller (901) is provided with a rubber block (906). The storage box (902) is equipped with a piston (11) inside. The piston (11) is slidably disposed inside the storage box (902). A connecting rod (12) is provided on one side of the piston (11) and the connecting rod (12) passes through the interior of the storage box (902).

2. The plate leveling device according to claim 1, characterized in that: The operating platform (1) is equipped with a first drive motor (3) and a slide rod (5) inside. The output end of the first drive motor (3) is connected to a lead screw (4). The slide rod (5) and the lead screw (4) both pass through the interior of the mounting block (2).

3. The plate leveling device according to claim 1, characterized in that: The clamping assembly (6) includes a limiting block (601) disposed on the mounting block (2). The limiting block (601) is provided with a clamping base plate (602) and a fixing base plate (603). A clamping area for clamping one side of the steel plate is formed between the fixing base plate (603) and the clamping base plate (602). The fixing base plate (603) has a plurality of through holes inside. A clamping rod (604) is provided in the through holes of the fixing base plate (603). A spring (605) is provided on the outside of the clamping rod (604). The two ends of the spring (605) are respectively connected to the inner wall of the through holes of the fixing base plate (603). One end of the clamping rod (604) faces the clamping area and is connected to the surface of the steel plate. The other end of the clamping rod (604) is provided with a pressure member (606).

4. The plate leveling device according to claim 3, characterized in that: The pressure-applying component (606) includes a fixing block (60601) and a sliding groove (60602) disposed on the limiting block (601). A pressure plate (60603) is slidably disposed in the sliding groove (60602) of the limiting block (601). One side of the pressure plate (60603) contacts the other end of the clamping rod (604). A threaded rod (60604) is provided on the other side of the pressure plate (60603). The threaded rod (60604) passes through the interior of the fixing block (60601).

5. The plate leveling device according to claim 4, characterized in that: The operating platform (1) is provided with a guide plate (10) inside. The guide plate (10) spans the cooling area and the lubrication area. The upper surface of the guide plate (10) is flush with the lower side wall of the horizontal channel.

6. The plate leveling device according to claim 5, characterized in that: The cooling assembly (8) includes a condenser (801) and a second drive motor (802). The output end of the second drive motor (802) is connected to a fan blade (803). The outlet end of the condenser (801) is located below the fan blade (803), and the fan blade (803) is located above the guide plate (10).

7. The plate leveling device according to claim 6, characterized in that: The cooling area of ​​the operating platform (1) is provided with an air guide shroud (804), the bottom of which is provided with a rectangular air outlet, and the air outlet of the condenser (801) faces the rectangular air outlet.

8. The plate leveling device according to claim 6, characterized in that: The output end of the second drive motor (802) is connected to the first turntable (13). The top of the fan blade (803) and near its center position is provided with a second turntable (14). A connecting shaft (15) is provided between the first turntable (13) and the second turntable (14). The connecting shaft (15) is eccentrically positioned with respect to the first turntable (13). A connecting rod (16) is provided between the connecting shaft (15) and the connecting rod (12). The connecting rod (16) is rotatably positioned with respect to both the connecting shaft (15) and the connecting rod (12).

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