CN219310259U - Tapping machine convenient to adjust tapping mechanism - Google Patents

Abstract

The utility model discloses a tapping machine which is convenient for adjusting a tapping mechanism, which comprises a base, a side plate is fixedly connected to the top of the base near the right side, and a top plate is fixedly connected to the top of the left side of the side plate, The utility model facilitates the adjustment of the height of the tapping unit by setting the adjustment mechanism and the cooperation between the first servo motor, the second worm wheel, the second worm, the threaded rod and the threaded pipe, thereby facilitating the tapping work The utility model sets the clamping mechanism and moves the rack plate, the driven bevel gear, the transmission rod, the first worm wheel, the first worm and the second servo motor through the mutual cooperation between these components, which is convenient to drive the two The relative movement of two splints clamps and fixes the workpiece, thereby improving the stability of subsequent tapping, and the position and angle of the workpiece can be adjusted through the setting of the electric push rod and electric telescopic rod.

Description

A Tapping Machine Convenient for Adjusting the Tapping Mechanism

technical field

The utility model relates to the technical field of tapping machines, in particular to a tapping machine which is convenient for adjusting a tapping mechanism.

Background technique

Tapping machine generally refers to tapping machine. Tapping machine is a kind of machining on the inner surface of the holes of parts with different specifications of through holes or blind holes, such as machine shells, equipment end faces, nuts, flanges, etc. Internal threads, screws or machining equipment called buckles, tapping machines are also called thread tapping machines, thread tapping machines, automatic tapping machines, etc.

Due to the traditional tapping machine that is easy to adjust the tapping mechanism, in the process of use, most tapping machines mostly perform tapping processing on one type of workpiece, resulting in a limited range of use, and the existing tapping machine It is inconvenient to clamp and fix the workpiece during use, resulting in poor practicability of the device.

Utility model content

The purpose of this utility model is to provide a tapping machine which is convenient to adjust the tapping mechanism, so as to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the utility model provides the following technical solutions:

A tapping machine for adjusting the tapping mechanism, comprising a base, the top of the base near the right side is fixedly connected with a side plate, and the top of the left side of the side plate is fixedly connected with a top plate, the bottom of the top plate There is a flat plate below, the bottom of the flat plate is fixedly connected with a tapping unit near the middle position, the top of the flat plate is provided with a lifting mechanism, and two square holes are opened near the right side of the flat plate, and the two The two square holes are arranged up and down, and the inner cavities of the two square holes are provided with square rods, and the tops of the two square rods are fixedly connected with the bottom of the top plate, and the bottom of the flat plate is close to the left side. The position is fixedly connected with the limit expansion rod, and the bottom end of the limit expansion rod is fixedly connected with a pressure plate, the outer side of the limit limit expansion rod is provided with a spring, and the upper and lower ends of the spring are respectively fixed with the flat plate and the pressure plate. connected, and the top of the base is provided with a fixed seat near the top of the left side, the fixed seat is provided with a cavity, and the top of the fixed seat is provided with a clamping mechanism, and the bottom of the fixed seat is close to the left and right Both sides are fixedly connected with support rods, and the bottom ends of the two support rods are fixedly connected with a turntable, and the bottom of the turntable is fixedly connected with rotating blocks near the left and right sides, and the bottoms of the two rotating blocks Both are fixedly connected with a circular slider, a circular shell is provided under the bottom of the turntable, and a groove is opened on the top of the base near the left side, and the bottom of the circular shell extends into the groove cavity, and a circular chute is opened on the top of the circular shell, and the two circular sliders are movably connected to the inner cavity of the circular chute.

As a preferred technical solution of the present invention, an electric telescopic rod is fixedly connected to the right side of the inner cavity of the circular shell, and a push plate is fixedly connected to the power end of the electric telescopic rod, and the left side of the push plate The side is fixedly connected with a transmission rack plate, and the front side of the transmission rack plate is engaged with a transmission gear near the left side. The bottom of the inner cavity of the shaped shell is movably connected, and the top of the circular shell is fixedly connected with the first bearing, and the top end of the rotating shaft passes through the inner cavity of the first bearing and is fixedly connected with the bottom of the turntable. The circular shell A moving block is fixedly connected to the bottom of the groove, and an electric push rod is fixedly connected to the left side of the inner cavity of the groove, and the power end of the electric push rod is fixedly connected to the moving block.

As a preferred technical solution of the present utility model, the clamping mechanism includes an installation groove, the installation groove is fixedly connected at the middle position of the bottom of the fixing seat, and the bottom of the inner cavity of the installation groove is fixedly connected with a second servo motor, the output shaft of the second servo motor is fixedly connected with a first worm, the bottom of the cavity is provided with a perforation, and the inner cavity of the perforation is fixedly connected with a second bearing, and the top end of the first worm runs through The inner chamber of the second bearing is movably connected with the top of the inner chamber of the cavity, and the front side of the first worm near the top is engaged with the first worm wheel.

As a preferred technical solution of the present invention, the center of the first worm wheel is provided with a transmission rod, and the bottom of the inner cavity of the cavity is fixedly connected to the left and right sides. The third bearings are fixedly connected to the vertical plates, and the left and right ends of the transmission rod respectively pass through the inner chambers of the adjacent third bearings, and are fixedly connected to the driving bevel gears, and the two driving bevel gears The top is meshed with a driven bevel gear, and the center of the top of the driven bevel gear is fixedly connected with a movable rod, and the tops of the two movable rods are movably connected with the top of the cavity inner cavity, and the two The outer sides of the movable rods are fixedly connected with movable gears, the rear sides of the two movable gears are meshed with movable rack plates, and the bottoms of the two movable rack plates are fixedly connected near the opposite sides. There is a moving plate, and limit holes are provided near the bottom of the two moving plates, and the inner cavity of the limit hole is provided with a limit rod, and the opposite ends of the two limit rods are connected to the cavity. Lumen fixed connection.

As a preferred technical solution of the present invention, the tops of the two moving rack plates are fixedly connected with moving rods near the opposite sides, and the tops of the cavities are provided with rectangular openings near the left and right sides. And the top ends of the two moving rods are respectively plugged into the inner cavities of the adjacent rectangular openings, and are fixedly connected with splints.

As a preferred technical solution of the present invention, the lifting mechanism includes a protective shell, the protective shell is fixedly connected to the top of the right side of the side plate, and the right side of the inner cavity of the protective shell is fixedly connected to the first servo motor, the output shaft of the first servo motor is fixedly connected with a second worm, and the left side of the protective shell is fixedly connected with a fourth bearing, and the top of the top plate is fixedly connected with straight plates near the left and right sides, and The fifth bearing is fixedly connected to the two straight plates, and the left end of the second worm passes through the inner cavities of the adjacent fourth bearing and the fifth bearing in turn, and is inserted into the inner cavity far away from the fifth bearing. Two second worm gears are meshed at the front and back of the second worm near the left and right sides, and the two second worm gears are arranged on the left and right sides.

As a preferred technical solution of the present utility model, threaded pipes are provided at the centers of the two second worm wheels, and sixth bearings are fixedly connected to the top of the top plate near the left and right sides. The bottom ends of the threaded pipes run through the inner chambers of the adjacent sixth bearings respectively, and both extend to the bottom of the top plate, and the inner chambers of the two threaded pipes are movably connected with threaded rods, and the bottoms of the two threaded rods are Both ends are fixedly connected to the top of the plate.

Compared with the prior art, the utility model has the beneficial effects of:

1. The utility model facilitates the adjustment of the height of the tapping unit by setting the adjustment mechanism and the mutual cooperation between the first servo motor, the second worm wheel, the second worm, the threaded rod and the threaded pipe, so as to facilitate the tapping The development of silk work;

2. The utility model is convenient to drive the two parts by setting the clamping mechanism, moving the rack plate, the driven bevel gear, the transmission rod, the first worm wheel, the first worm and the second servo motor. The relative movement of the splint clamps and fixes the workpiece, thereby improving the stability of the subsequent tapping, and the position and angle of the workpiece can be adjusted through the setting of the electric push rod and the electric telescopic rod.

Description of drawings

Fig. 1 is the front section view of the utility model,

Fig. 2 is the enlarged view of place A in Fig. 1 of the utility model,

Fig. 3 is the enlarged view of place B in Fig. 1 of the utility model,

Fig. 4 is an enlarged view of C in Fig. 1 of the utility model.

In the figure: 1. base; 2. side plate; 3. square rod; 4. first servo motor; 5. tapping unit; 6. top plate; 7. spring; 8. limit expansion rod; 9. fixed seat; 10. Electric push rod; 11. Turntable; 12. Rotating block; 13. Electric telescopic rod; 14. Push plate; 15. Transmission rack plate; 16. Rotation shaft; 17. Transmission gear; 18. Moving rack plate; 19. Driven bevel gear; 20. Movable gear; 21. Driving bevel gear; 22. Transmission rod; 23. The first worm gear; 24. The first worm; 25. The second servo motor; 26. The second worm gear; 27, the second worm; 28, threaded rod; 29, flat plate; 30, threaded pipe.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Embodiment: As shown in Figure 1-4, the utility model provides the following technical solutions:

Embodiment one:

A tapping machine for easy adjustment of the tapping mechanism, comprising a base 1, a side plate 2 is fixedly connected to the top of the base 1 near the right side, and a top plate 6 is fixedly connected to the top of the left side of the side plate 2, and a top plate 6 is fixedly connected to the bottom of the top plate 6 Below place is provided with flat plate 29, and the bottom of flat plate 29 is fixedly connected with tapping unit 5 near the middle position, and the top of flat plate 29 is provided with lifting mechanism, and offers two square holes near the right side on flat plate 29, and two The square holes are arranged up and down, and the inner cavities of the two square holes are provided with square rods 3, and the tops of the two square rods 3 are fixedly connected to the bottom of the top plate 6, and the bottom of the flat plate 29 is fixedly connected to a limited position near the left side. Telescopic rod 8, and the bottom end of limiting telescopic rod 8 is fixedly connected with pressing plate, and the outer side of limiting telescopic rod 8 is provided with spring 7, and the upper and lower ends of spring 7 are fixedly connected with plate 29 and pressing plate respectively, and base 1 The top of the fixed seat 9 is provided with a fixed seat 9 near the top of the left side, and a cavity is provided on the fixed seat 9, and the top of the fixed seat 9 is provided with a clamping mechanism, and the bottom of the fixed seat 9 is fixedly connected with supports near the left and right sides. The bottom ends of the two support rods are fixedly connected with a turntable 11, the bottom of the turntable 11 is fixedly connected with a rotating block 12 near the left and right sides, and the bottoms of the two rotating blocks 12 are fixedly connected with a circular slider. 11 The bottom of the bottom is provided with a circular shell, the right side of the circular shell cavity is fixedly connected with an electric telescopic rod 13, and the power end of the electric telescopic rod 13 is fixedly connected with a push plate 14, and the left side of the push plate 14 is fixed A transmission rack plate 15 is connected, and the front side of the transmission rack plate 15 is engaged with a transmission gear 17 near the left side. The center of the circle on the transmission gear 17 is provided with a rotating shaft 16, and the bottom of the rotating shaft 16 is in contact with the circular shell. The bottom of the inner cavity is movably connected, the top of the circular shell is fixedly connected with the first bearing, and the top of the rotating shaft 16 runs through the inner cavity of the first bearing, and is fixedly connected with the bottom of the turntable 11, and the bottom of the circular shell is fixedly connected with a movable block, and the left side of the groove cavity is fixedly connected with an electric push rod 10, the power end of the electric push rod 10 is fixedly connected with the moving block, and the top of the base 1 is provided with a groove near the left side. The bottom extends to the inner cavity of the groove, and the top of the circular shell is provided with a circular chute, and the two circular sliders are movably connected to the inner cavity of the circular chute;

The clamping mechanism includes an installation groove, the installation groove is fixedly connected to the middle position of the bottom of the fixed seat 9, and the bottom of the inner chamber of the installation groove is fixedly connected with a second servo motor 25, and the output shaft of the second servo motor 25 is fixedly connected with a first Worm 24, the bottom of the cavity is provided with a perforation, and the inner cavity of the perforation is fixedly connected with the second bearing, the top of the first worm 24 runs through the inner cavity of the second bearing, and is movably connected with the top of the inner cavity of the cavity, and the second The front side of a worm 24 is meshed with the first worm wheel 23 near the top, and the center of circle on the first worm wheel 23 is provided with a transmission rod 22, and the bottom of the cavity inner cavity is fixedly connected with vertical plates near the left and right sides. Each vertical plate is fixedly connected with a third bearing, and the left and right ends of the transmission rod 22 respectively pass through the inner cavity of the adjacent third bearing, and are fixedly connected with the driving bevel gear 21, and the two driving bevel gears 21 The top is all meshed with driven bevel gear 19, and the center of circle of driven bevel gear 19 top is fixedly connected with movable rod, and the top of two movable rods is all movably connected with the top of cavity inner cavity, and two movable rods The outer sides of the two movable gears 20 are fixedly connected with movable gears 20, the rear sides of the two movable gears 20 are meshed with movable rack plates 18, and the tops of the two movable rack plates 18 are fixedly connected with movable rods near the opposite side. The top of the top is provided with a rectangular opening close to the left and right sides, and the tops of the two moving rods are respectively plugged into the inner cavity of the adjacent rectangular opening, and are fixedly connected with splints, and the bottoms of the two moving rack plates 18 are close to The opposite side is fixedly connected with the moving plate, and the two moving plates are provided with limit holes near the bottom, and the inner cavity of the limit hole is provided with a limit rod, and the opposite ends of the two limit rods are connected with the space The lumen of the cavity is fixedly connected;

In the process of tapping the workpiece, the disc-shaped workpiece is placed on the top of the fixed seat 9. After the placement is completed, the second servo motor 25 is started by an external power supply. When the second servo motor 25 works, its output shaft will drive the first servo motor 25. A worm screw 24 rotates, and the rotation of the first worm screw 24 will drive the first worm wheel 23 to rotate, and the rotation of the first worm wheel 23 will drive the transmission rod 22 to rotate, and the rotation of the transmission rod 22 will drive the driving bevel gear 21 to rotate, and the rotation of the driving bevel gear 21 will Drive the driven bevel gear 19 to rotate, and the driven bevel gear 19 will drive the movable rod to rotate, and the movable rod will drive the movable gear 20 to rotate, and the movable gear 20 will drive the movable rack plate 18 meshed with it to approach One side of the center of the cavity moves, and the relative movement of the two moving rack plates 18 will drive the two splints to move relative to the disc-shaped workpiece through the adjacent moving rods. After the clamping and fixing are completed, the second servo motor 25 Just stop running.

Embodiment two;

The lifting mechanism includes a protective case, the protective case is fixedly connected to the top of the right side of the side plate 2, and the right side of the inner cavity of the protective case is fixedly connected with the first servo motor 4, and the output shaft of the first servo motor 4 is fixedly connected with the second Worm screw 27, and the left side of protective case is fixedly connected with the 4th bearing, and the top of top plate 6 is all fixedly connected with straight plate near left and right sides, and all fixedly connected with the 5th bearing on two straight plates, the left end of the second worm screw 27 It runs through the inner cavities of the adjacent fourth bearing and the fifth bearing in turn, and is plugged into the inner cavity far away from the fifth bearing. Two second worm gears 26 are engaged in the front and back of the second worm 27 near the left and right sides. The center of circle on the second worm wheel 26 is provided with a threaded pipe 30, and the top of the top plate 6 is fixedly connected with the sixth bearing near the left and right sides. cavity, and both extend to the bottom of the top plate 6, and the inner cavities of the two threaded tubes 30 are movably connected with threaded rods 28, the bottom ends of the two threaded rods 28 are fixedly connected with the top of the flat plate 29, and the two second The worm gear 26 is arranged left and right;

Start the first servo motor 4 by an external power supply after the clamping and fixing of the workpiece is completed. When the first servo motor 4 works, its output shaft will drive the second worm 27 to rotate, and the rotation of the second worm 27 will drive the second worm wheel 26 to rotate. The rotation of the second worm wheel 26 will drive the threaded pipe 30 to rotate, and the rotation of the two threaded pipes 30 will jointly drive the flat plate 29 to move downward through the adjacent threaded rods 28, and the downward movement of the flat plate 29 will drive the tapping unit 5 to move downward. After the 29 moves downward for a certain distance, the pressure plate will touch the upper end of the workpiece. As the plate 29 continues to move down, the spring 7 will be in a compressed state. Under the reaction force of the spring 7, the pressure plate can be tightly bound against the workpiece. , then finally the workpiece is tapped by the tapping unit 5 moving downwards.

Working principle: first, in the process of tapping the workpiece, the disc-shaped workpiece is placed on the top of the fixed seat 9, and after the placement is completed, the second servo motor 25 is started by an external power supply. When the second servo motor 25 is working, its The output shaft will drive the first worm 24 to rotate, the first worm 24 will drive the first worm wheel 23 to rotate, the first worm wheel 23 will drive the transmission rod 22 to rotate, the transmission rod 22 will drive the driving bevel gear 21 to rotate, the driving bevel The rotation of the bevel gear 21 will drive the driven bevel gear 19 to rotate, the rotation of the driven bevel gear 19 will drive the movable rod to rotate, the rotation of the movable rod will drive the movable gear 20 to rotate, and the rotation of the movable gear 20 will drive the movable gear meshed with it. The strip plate 18 moves to the side close to the center of the cavity, and the relative movement of the two moving rack plates 18 will drive the two splints to move relatively through the adjacent moving rods to clamp the disc-shaped workpiece. The second servomotor 25 stops running and then the first servomotor 4 is started by an external power supply after the workpiece is clamped and fixed. When the first servomotor 4 works, its output shaft can drive the second worm screw 27 to rotate, and the second worm screw The rotation of 27 will drive the second worm wheel 26 to rotate, and the rotation of the second worm wheel 26 will drive the threaded pipe 30 to rotate, and the rotation of the two threaded pipes 30 will jointly drive the flat plate 29 to move downward through the adjacent threaded rod 28, and the downward movement of the flat plate 29 will Drive the tapping unit 5 to move downward, and the flat plate 29 will move downward for a certain distance to make the pressure plate and the upper end of the workpiece resist. As the flat plate 29 continues to move down, the spring 7 will be in a compressed state, and under the reaction force of the spring 7, it can Make the pressure plate tightly contact the workpiece to limit, then finally the tapping unit 5 moves downward to perform tapping on the workpiece, and between the operation of the first servo motor 4 by the external power supply, the electric motor can be started by the external power supply as required. When the push rod 10 and the electric push rod 10 are working, the position of the workpiece will be adjusted, so as to meet the requirements of tapping workpieces with different diameters, while the electric telescopic rod 13 will drive the workpiece to rotate when working, thereby improving the use effect.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (7)

1. A tapping machine that is convenient to adjust the tapping mechanism, comprising a base, the top of the base is fixedly connected with a side plate near the right side, and the top of the left side of the side plate is fixedly connected with a top plate, the top plate A flat plate is arranged below the bottom, and a tapping unit is fixedly connected to the bottom of the flat plate close to the middle position. It is characterized in that: a lifting mechanism is provided on the top of the flat plate, and two two square holes, and the two square holes are set up and down, the inner cavities of the two square holes are provided with square rods, and the tops of the two square rods are fixedly connected with the bottom of the top plate. The bottom of the plate is fixedly connected to the limit expansion rod near the left side, and the bottom end of the limit expansion rod is fixedly connected with a pressure plate, the outer side of the limit expansion rod is provided with a spring, and the upper and lower ends of the spring They are respectively fixedly connected with the flat plate and the pressure plate, and the top of the base is provided with a fixed seat near the top of the left side, the fixed seat is provided with a cavity, and the top of the fixed seat is provided with a clamping mechanism, the The bottom of the fixing seat is fixedly connected with support rods near the left and right sides, and the bottom ends of the two support rods are fixedly connected with a turntable, and the bottom of the turntable is fixedly connected with a rotating block near the left and right sides. The bottom of the rotating block is fixedly connected with a circular slider, the bottom of the turntable is provided with a circular shell, and the top of the base is provided with a groove near the left side, and the bottom of the circular shell is Extending to the inner cavity of the groove, and the top of the circular shell is provided with a circular chute, and the two circular sliders are movably connected to the inner cavity of the circular chute. 2. The tapping machine for adjusting the tapping mechanism according to claim 1, characterized in that: an electric telescopic rod is fixedly connected to the right side of the inner cavity of the circular shell, and the electric telescopic rod The power end is fixedly connected with a push plate, and the left side of the push plate is fixedly connected with a transmission rack plate, and the front side of the transmission rack plate is engaged with a transmission gear near the left side, and the upper center of the transmission gear runs through A rotating shaft is provided, and the bottom of the rotating shaft is flexibly connected to the bottom of the inner cavity of the circular shell, the top of the circular shell is fixedly connected with a first bearing, and the top end of the rotating shaft penetrates the inner cavity of the first bearing , and is fixedly connected with the bottom of the turntable, the bottom of the circular shell is fixedly connected with a moving block, and the left side of the inner cavity of the groove is fixedly connected with an electric push rod, the power end of the electric push rod is connected with the moving The block is fixedly connected. 3. The tapping machine for adjusting the tapping mechanism according to claim 1, characterized in that: the clamping mechanism includes a mounting groove, and the mounting groove is fixedly connected at the middle position of the bottom of the fixing seat, and The bottom of the inner cavity of the installation groove is fixedly connected with a second servo motor, the output shaft of the second servo motor is fixedly connected with a first worm, the bottom of the cavity is provided with a perforation, and the inner cavity of the perforation is fixed A second bearing is connected, the top of the first worm passes through the inner cavity of the second bearing, and is movably connected with the top of the inner cavity of the cavity, and the front side of the first worm near the top is engaged with a first worm wheel. 4. A tapping machine that is convenient for adjusting the tapping mechanism according to claim 3, characterized in that: the center of the upper circle of the first worm wheel is provided with a transmission rod, and the bottom of the inner cavity of the cavity is close to the left and right Risers are fixedly connected to both sides, the third bearings are fixedly connected to the two risers, and the left and right ends of the transmission rod respectively pass through the inner cavity of the adjacent third bearing, and are fixedly connected to the third bearing. The driving bevel gear, the tops of the two driving bevel gears are meshed with the driven bevel gear, and the center of the circle at the top of the driven bevel gear is fixedly connected with a movable rod, and the tops of the two movable rods Both are movably connected with the top of the inner cavity of the cavity, and the outer sides of the two movable rods are fixedly connected with movable gears, and the rear sides of the two movable gears are engaged with movable rack plates, and the two movable rods The bottom of the rack plate is fixedly connected with a moving plate near the opposite side, and the two moving plates are provided with limiting holes near the bottom, and the inner cavity of the limiting hole is provided with a limiting rod. The opposite ends of each of the limit rods are fixedly connected with the inner cavity of the cavity. 5. A kind of tapping machine that is convenient for adjusting the tapping mechanism according to claim 4, characterized in that: the tops of the two moving rack plates are fixedly connected with moving rods near the opposite sides, and the hollow The top of the cavity is provided with rectangular openings close to the left and right sides, and the top ends of the two moving rods are respectively plugged into the inner cavity of the adjacent rectangular opening, and are fixedly connected with splints. 6. The tapping machine for adjusting the tapping mechanism according to claim 1, characterized in that: the lifting mechanism includes a protective case, and the protective case is fixedly connected to the top of the right side of the side plate, and the The right side of the inner cavity of the protective shell is fixedly connected with a first servo motor, the output shaft of the first servo motor is fixedly connected with a second worm, and the left side of the protective shell is fixedly connected with a fourth bearing, and the top plate Straight plates are fixedly connected to the top of the top near the left and right sides, and the fifth bearing is fixedly connected to the two straight plates, and the left end of the second worm passes through the inner cavities of the adjacent fourth bearing and the fifth bearing in turn. And plugged in the inner cavity far away from the fifth bearing, two second worm gears are engaged with the front and rear of the second worm close to the left and right sides, and the two second worm gears are arranged on the left and right sides. 7. A tapping machine for adjusting the tapping mechanism according to claim 6, characterized in that: threaded tubes are provided at the centers of the upper circles of the two second worm wheels, and the top of the top plate is close to the left and right Both sides are fixedly connected with sixth bearings, and the bottom ends of the two threaded pipes pass through the inner cavities of the adjacent sixth bearings respectively, and both extend to the bottom of the top plate, and the inner cavities of the two said threaded pipes are both Threaded rods are movably connected, and the bottom ends of the two threaded rods are fixedly connected with the top of the flat plate.

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