Automatic tungsten powder loading machine

Abstract

The invention relates to the technical field of tungsten powder loading, in particular to an automatic tungsten powder loading machine. Comprising a mounting frame; the control panel is mounted at the top of the mounting frame; the conveyor is mounted on the mounting frame; the mounting plates are connected to a conveying belt of the conveyor at intervals in the circumferential direction; the heating frame is mounted on the mounting plate; the mounting rods are symmetrically connected to the top of the mounting frame; the linear motor is mounted on the mounting rod; the connecting plate is connected to a rotor of the linear motor; the conical barrel is connected to the connecting plate; the connecting frame is connected to the top of the mounting frame and located on the side face of the mounting rod. Through cooperation of the conveyor, the mechanical arm, the linear motor, the conical barrel and the connecting frame, taking, preheating, filling and flattening treatment of boats can be automatically completed, by means of the design, the production efficiency can be greatly improved, the production period can be greatly shortened, the accuracy and consistency of each time of boat filling can be guaranteed, errors caused by manual operation are avoided, and the production efficiency is improved. Therefore, the consistency of product quality can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of tungsten powder boat loading, and in particular to an automatic tungsten powder boat loading machine. Background Art

[0002] In modern metallurgy and materials science, tungsten powder, as a key raw material, is widely used in the manufacture of cemented carbide, high-temperature alloys, electronic components and other high-performance materials. The production process of tungsten powder is complex and delicate, among which the boat loading process is crucial to ensure the quality of the final product.

[0003] In current technical practice, workers usually pour the pre-prepared tungsten powder raw materials into special boats and manually flatten them using tools. Although this process seems simple, in mass production, each boat needs to be manually filled and leveled one by one, which not only consumes a lot of manpower but also reduces work efficiency. More importantly, manual operation makes it difficult to ensure the accuracy and consistency of each boat loading. This inconsistency will affect the quantity and distribution of tungsten powder in the boat, causing tungsten powder in different boats to undergo different degrees of reduction reaction under the same reduction conditions, thereby affecting the purity, particle size distribution and morphology of the final product and reducing the consistency of product quality. In addition, the boat loading process is usually carried out in a high temperature environment. Long-term exposure to this working environment makes workers susceptible to the effects of thermal radiation, which may lead to physical fatigue, dehydration, and even the risk of heat stroke. Summary of the invention

[0004] In view of this, the present invention provides an automated tungsten powder boat loading machine, which can overcome the shortcomings of the existing tungsten powder raw material boat loading process which is usually performed manually, has low work efficiency in mass production, and is difficult to ensure the accuracy and consistency of each boat loading.

[0005] The technical solution of the present invention is: an automated tungsten powder boat loading machine, comprising: a mounting frame; a control panel mounted on the top of the mounting frame; a conveyor mounted on the mounting frame; a mounting plate connected to the conveyor belt of the conveyor at circumferential intervals; a heating frame mounted on the mounting plate; a mounting rod symmetrically connected to the top of the mounting frame; a linear motor mounted on the mounting rod; a connecting plate connected to the mover of the linear motor; a conical cylinder connected to the connecting plate; a connecting frame connected to the top of the mounting frame, the connecting frame is located on the side of the mounting rod, the bottom of the conical cylinder contacts the top of the connecting frame, and a straight hole is opened on the connecting frame, a material taking assembly is arranged on the mounting frame, and is used to take the boat, and a loading mechanism is arranged on the mounting frame, and is used to load the tungsten powder raw material.

[0006] In one of the embodiments, the material taking assembly includes: a mechanical arm installed on the top of the mounting frame; a limiting spring piece symmetrically connected to the top of the mounting plate, and the limiting spring piece is used to fix the boat placed in the heating frame.

[0007] In one of the embodiments, the loading mechanism includes: a support frame connected to the mounting frame; a charging barrel connected to the top of the support frame; a rotating cover rotatably connected to the top of the charging barrel; a connecting tube connected to the bottom of the charging barrel; a guide frame connected to the lower end of the connecting tube; a slide rod symmetrically slidably connected to the guide frame; a baffle slidably connected in the guide frame, and the baffle is connected to the end of the slide rod; a connecting spring wound around the outside of the slide rod, and the two ends of the connecting spring are respectively connected to the end of the slide rod and the side of the guide frame; a square plate connected to the top of the conical barrel, and a through hole is opened on the square plate; a leveling component is arranged on the connecting frame, and is used to level the tungsten powder raw material in the boat.

[0008] In one embodiment, the sweeping assembly includes: a sliding frame, which is slidably connected to a connecting frame, and a circular hole is opened on the top of the sliding frame, the lower end of the conical cylinder is located in the circular hole, and a square hole is also opened on the sliding frame, and the square hole is located directly below the circular hole; bristles are connected to the bottom of the sliding frame at intervals, and the bristles are distributed around the square hole.

[0009] In one of the embodiments, it further comprises: rubber blocks, wherein two rubber blocks are respectively connected to the side surface of the baffle plate and the side surface of the square plate, and the two rubber blocks are in contact with each other.

[0010] In one of the embodiments, it also includes: a fixed plate, symmetrically connected to both sides of the mounting frame; a first rotating brush, rotatably connected to the fixed plate; a first drive motor, installed on one of the side surfaces of the fixed plate, and the output shaft of the first drive motor is connected to the end of the first rotating brush; a second rotating brush, symmetrically rotationally connected to the fixed plate; a second drive motor, installed on one of the side surfaces of the fixed plate, and the output shaft of the second drive motor is connected to the end of one of the second rotating brushes; and a pulley assembly, through which the two second rotating brushes are transmitted.

[0011] In one of the embodiments, it also includes: a collection frame connected to the mounting frame, and the collection frame is located below the first rotating brush and the second rotating brush.

[0012] In one of the embodiments, it also includes: a third driving motor installed on the top of the charging barrel; a spiral rod connected to the output shaft of the third driving motor, and the lower end of the spiral rod is located inside the connecting tube.

[0013] The beneficial effects are: 1. The present invention can automatically complete the taking, preheating, filling and leveling of boat dishes through the cooperation of conveyors, robotic arms, linear motors, conical cylinders and connecting frames. This design can not only greatly improve production efficiency and shorten production cycles, but also ensure the accuracy and consistency of each boat loading, avoid errors caused by manual operations, and thus ensure the consistency of product quality.

[0014] 2. The present invention can accurately control the feeding amount of tungsten powder through the design of the conical cylinder and the baffle to prevent excessive or insufficient feeding. The leveling component can not only prevent dust during the falling of tungsten powder, but also evenly level the tungsten powder raw materials in the boat to ensure uniform distribution. The use of the spiral rod can further optimize the conveying process of tungsten powder, prevent clogging inside the connecting pipe, and ensure continuous and stable feeding. These measures work together to improve the yield and quality stability of the product and reduce product defects caused by uneven loading of the boat.

[0015] 3. The present invention can preheat the boat before loading, reduce thermal shock, ensure temperature consistency during the reduction process, and improve product quality. Through the rotation of the first rotating brush and the second rotating brush, impurities on the surface of the boat can be cleaned in time without affecting the production process, and the working environment can be kept clean. Most importantly, the application of the automation system can reduce the exposure time of workers in high temperature environment, reduce the impact of thermal radiation on the human body, and avoid physical fatigue, dehydration and even heat stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the specific structure of the mounting rod and the connecting frame of the present invention.

[0018] Figure 3 It is a schematic diagram of the installation of the limiting spring piece of the present invention.

[0019] Figure 4 It is a schematic diagram of the installation of the feeding mechanism of the present invention.

[0020] Figure 5 It is a specific structural schematic diagram of the feeding mechanism of the present invention.

[0021] Figure 6 It is the installation schematic diagram and specific structural schematic diagram of the leveling component of the present invention.

[0022] Figure 7 It is a schematic diagram of the installation of the fixing plate and the collecting frame of the present invention.

[0023] Figure 8 It is a schematic diagram of the specific structure of the fixing plate of the present invention.

[0024] Fig. 9 It is a schematic diagram of the installation of the third driving motor and the spiral rod of the present invention.

[0025] Fig.10 Schematic diagram of the specific structure of the boat.

[0026] In the figure numbers: 001-boat, 002-inclined surface, 1-mounting frame, 2-control panel, 3-conveyor, 4-mounting plate, 5-heating frame, 6-mounting rod, 7-linear motor, 8-connecting plate, 9-conical cylinder, 10-connecting frame, 1001-slotted hole, 11-mechanical arm, 12-limiting spring, 13-support frame, 14-charging cylinder, 15-rotating cover, 16-connecting pipe, 17-guide frame, 18-slide Rod, 19-baffle, 20-connecting spring, 21-square plate, 2101-through hole, 22-sliding frame, 2201-round hole, 2202-square hole, 23-bristles, 24-rubber block, 25-fixed plate, 26-first rotating brush, 27-first driving motor, 28-second rotating brush, 29-second driving motor, 30-pulley assembly, 31-collecting frame, 32-third driving motor, 33-screw rod. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Embodiment: An automated tungsten powder boat loading machine, such as Figure 1-Figure 6 As shown, it includes a mounting frame 1, a control panel 2, a conveyor 3, a mounting plate 4, a heating frame 5, a mounting rod 6, a linear motor 7, a connecting plate 8, a conical cylinder 9, a connecting frame 10, a material taking component and a feeding mechanism. The control panel 2 is installed on the top right side of the mounting frame 1, and the conveyor 3 is installed on the upper left side of the mounting frame 1. A plurality of mounting plates 4 are connected to the conveyor belt of the conveyor 3 at intervals in the circumferential direction. A heating frame 5 is installed on each mounting plate 4. The boat 001 can be placed in the heating frame 5 for preheating. The left side of the part is symmetrically connected with mounting rods 6, a linear motor 7 is installed between the upper parts of the two mounting rods 6, a connecting plate 8 is connected to the mover of the linear motor 7, a conical cylinder 9 is connected to the connecting plate 8, a connecting frame 10 is connected to the left side of the top of the mounting frame 1, the connecting frame 10 is located on the right side of the mounting rod 6, the bottom of the conical cylinder 9 is in contact with the top of the connecting frame 10, and a straight hole 1001 is opened in the middle of the upper part of the connecting frame 10, the material taking assembly is used to take the boat 001, and the loading mechanism is used to load the tungsten powder raw material.

[0029] like Figure 1 and Figure 3As shown, the material taking assembly includes a mechanical arm 11 and a limiting spring piece 12. The mechanical arm 11 is installed on the right side of the top of the mounting frame 1. The mechanical arm 11 is located on the left side of the control panel 2. The top of each mounting plate 4 is symmetrically connected to a limiting spring piece 12. The upper end of the limiting spring piece 12 is an arc surface. The upper end of the limiting spring piece 12 can clamp the top of the boat 001, so that the boat 001 placed in the heating frame 5 can be fixed. Since the front and rear sides of the boat 001 are provided with inclined surfaces 002 (such as Fig.10 As shown, when the robot arm 11 places the boat 001 into the heating frame 5 or takes the boat 001 out of the heating frame 5, the boat 001 will squeeze the limiting spring pieces 12 on the front and rear sides to bend and deform away from each other. When the boat 001 is separated from the limiting spring pieces 12, the limiting spring pieces 12 will return to their original shape due to their own elasticity.

[0030] like Figure 4-Figure 6 As shown, the feeding mechanism includes a support frame 13, a charging barrel 14, a rotating cover 15, a connecting pipe 16, a guide frame 17, a slide bar 18, a baffle 19, a connecting spring 20, a square plate 21 and a leveling assembly. The left rear side of the top of the mounting frame 1 is connected to the support frame 13, and the top of the support frame 13 is connected to the charging barrel 14. The rear side of the top of the charging barrel 14 is an open design, and the top of the charging barrel 14 is rotatably connected to the rotating cover 15, and the rotating cover 15 can cover the opening at the top of the charging barrel 14. The bottom of the charging barrel 14 is connected with a connecting tube 16, and the inner wall of the charging barrel 14 is an inclined surface, so that the tungsten powder raw material in the charging barrel 14 can fall down into the connecting tube 16. The lower part of the connecting tube 16 is connected with a guide frame 17, and the lower end of the connecting tube 16 is flush with the inner top wall of the guide frame 17. The upper part of the guide frame 17 is symmetrically slidably connected with a slide bar 18, and the inner part of the guide frame 17 is slidably connected with a baffle 19, which blocks the lower end of the connecting tube 16. The shape of the baffle 19 is L-shaped, and the rear ends of the two slide bars 18 are connected with the baffle. The plate 19 is fixedly connected, and the outer sides of the two slide bars 18 are both wound with connecting springs 20, and the two ends of the connecting springs 20 are respectively connected to the front end of the slide bar 18 and the front side of the guide frame 17, the top of the conical cylinder 9 is connected to a square plate 21, and a through hole 2101 is opened in the middle of the square plate 21, and the thickness of the square plate 21 is consistent with the thickness of the baffle 19, and the leveling component is used to level the tungsten powder raw material in the boat 001; the leveling component includes a sliding frame 22 and a brush 23, and the upper part of the connecting frame 10 is slidably connected to the sliding frame 22, and a round hole 2201 is opened on the top of the sliding frame 22, the lower end of the tapered cylinder 9 is located in the round hole 2201, a square hole 2202 is opened in the middle of the sliding frame 22, the square hole 2202 is located directly below the round hole 2201, and a plurality of bristles 23 are connected to the bottom of the sliding frame 22 at intervals, and the bristles 23 are distributed around the square hole 2202; it also includes a rubber block 24, the two rubber blocks 24 are respectively connected to the front side of the baffle 19 and the rear side of the square plate 21, and the side surfaces of the two rubber blocks 24 are in contact with each other.

[0031] Initially, the charging barrel 14 is filled with an appropriate amount of tungsten powder raw material; first, the device is installed on the side of the placement rack (not shown in the figure) of the boat 001, and then the conveyor 3 is controlled to work intermittently through the control panel 2, so that the conveyor 3 can drive the mounting plate 4 and the heating frame 5 to rotate intermittently clockwise. Whenever the mounting plate 4 and the heating frame 5 stop rotating, the robot arm 11 will take a boat 001 from the placement rack and place it in the heating frame 5. The limiting spring 12 will limit the boat 001. At the same time, the control panel 2 will control the heating frame 5 to preheat the boat 001. Then the heating frame 5 can drive the boat 001 inside it to rotate intermittently synchronously; at the same time, the linear motor 7 can be controlled by the control panel 2 to drive the connecting plate 8 to reciprocate back and forth. When the connecting plate 8 moves backward, the connecting plate 8 can drive the conical tube 9 and the square plate 21 to move backward, thereby driving the sliding frame 22 and the bristles 23 to move backward. When the square plate 21 moves backward until it contacts the baffle 19, the square plate 21 will push the baffle 19 to move backward, and the connecting spring 20 will be compressed, so that the baffle 19 no longer blocks the lower end of the connecting tube 16, and the lower end of the connecting tube 16 will be connected to the through hole 2101. At this time, the tungsten powder raw material in the charging barrel 14 will fall down into the conical tube 9 through the connecting tube 16 and the through hole 2101. The rubber block 24 can block the gap between the square plate 21 and the baffle 19 to prevent the tungsten powder raw material from being stuck between the square plate 21 and the baffle 19. Since the top of the connecting frame 10 blocks the bottom of the conical tube 9, the tungsten powder raw material in the conical tube 9 can be prevented The tungsten powder raw material in the loading barrel 14 will no longer fall into the conical barrel 9. Whenever a boat 001 rotates to the position directly below the straight hole 1001, the connecting plate 8 will move forward and reset. The connecting plate 8 can drive the conical barrel 9 and the square plate 21 to move forward and reset, thereby driving the sliding frame 22 and the bristles 23 to move forward and reset. At this time, the lower end of the connecting tube 16 is no longer connected to the through hole 2101, and the square plate 21 will be separated from the baffle 19. The connecting spring 20 will return to its original state, driving the baffle 19 to move forward and reset, so that the baffle 19 blocks the lower end of the connecting tube 16 again. When the lower end of the conical barrel 9 is aligned with the straight hole 1001, the top of the connecting frame 10 no longer blocks the bottom of the conical barrel 9, and the tungsten powder raw material passes through the square hole 2 202 falls into the boat 001. During the falling process of tungsten powder, the brush 23 can block the surrounding of the tungsten powder raw material to prevent dust and level the tungsten powder raw material in the boat 001 to ensure its uniform distribution. Then the conveyor 3 will drive the boat 001 containing the tungsten powder raw material to rotate back to the bottom of the robot arm 11. The robot arm 11 can take the boat 001 containing the tungsten powder raw material out of the heating frame 5 and put a new boat 001 into the heating frame 5. This reciprocating process can automatically add quantitative tungsten powder raw material to the batch of boats 001 and automatically level the tungsten powder raw material in the boat 001, thereby improving work efficiency. When the tungsten powder raw material in the charging barrel 14 is about to run out, the rotating cover 15 can be rotated to open, and then the tungsten powder raw material can be added to the charging barrel 14.Since boat 001 has been preheated in advance, thermal shock can be reduced and temperature consistency during the reduction process can be ensured. ;

[0032] like Figure 7 and Figure 8 As shown, it also includes a fixed plate 25, a first rotating brush 26, a first drive motor 27, a second rotating brush 28, a second drive motor 29, a pulley assembly 30 and a collecting frame 31. The front and rear sides of the lower part of the mounting frame 1 are connected to the fixed plates 25, the middle part between the two fixed plates 25 is rotatably connected to the first rotating brush 26, the middle part of the rear side of the fixed plate 25 on the rear side is connected to the first drive motor 27, and the output shaft of the first drive motor 27 is connected to the rear end of the first rotating brush 26, the left and right sides between the two fixed plates 25 are rotatably connected to the second rotating brush 28, the second rotating brush 28 and the first rotating brush 26 are both located directly below the conveyor 3, the left part of the rear side of the fixed plate 25 on the rear side is connected to the second drive motor 29, and the output shaft of the second drive motor 29 is connected to the rear end of the second rotating brush 28 on the left side, the pulley assembly 30 is composed of two pulleys and a flat belt, the two pulleys are respectively connected to the front ends of the two second rotating brushes 28, and the two pulleys are wound with a flat belt so that the two second rotating brushes 28 can be rotated. The brushes 28 can be transmitted through the pulley assembly 30, and the second rotating brush 28 and the first rotating brush 26 have opposite rotation directions. A collecting frame 31 is connected to the lower part of the mounting frame 1, and the collecting frame 31 is located below the first rotating brush 26 and the second rotating brush 28; when the conveyor 3 drives the boat 001 to rotate intermittently clockwise, the first driving motor 27 can be controlled by the control panel 2 to drive the first rotating brush 26 to rotate, and the second driving motor 29 can be controlled to drive the second rotating brush 28 on the left to rotate. Under the transmission action of the pulley assembly 30, the second rotating brush 28 on the right can be driven to rotate. When the boat 001 passes over the second rotating brush 28 and the first rotating brush 26, the second rotating brush 28 and the first rotating brush 26 rotate to sweep and clean the boat 001, and the second rotating brush 28 and the first rotating brush 26 have opposite rotation directions, thereby avoiding cleaning dead corners and ensuring the cleaning effect. The impurities swept down will fall down into the collecting frame 31, which is convenient for the workers to handle uniformly later.

[0033] like Fig. 9 As shown, it also includes a third drive motor 32 and a screw rod 33. The third drive motor 32 is connected to the middle of the top of the charging barrel 14, and the screw rod 33 is connected to the output shaft of the third drive motor 32, and the lower end of the screw rod 33 is located inside the connecting tube 16; when the device is working, the third drive motor 32 can be controlled by the control panel 2 to drive the screw rod 33 to rotate, and the screw rod 33 can transport the tungsten powder raw material in the charging barrel 14 downward to the connecting tube 16, thereby assisting the discharge of the tungsten powder raw material and preventing the inside of the connecting tube 16 from being blocked by the tungsten powder raw material.

[0034] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic tungsten powder boat loading machine, comprising: The mounting frame (1) is characterized in that it also includes: a control panel (2) mounted on the top of the mounting frame (1); a conveyor (3) mounted on the mounting frame (1); a mounting plate (4) connected to the conveyor belt of the conveyor (3) at circumferential intervals; a heating frame (5) mounted on the mounting plate (4); a mounting rod (6) symmetrically connected to the top of the mounting frame (1); a linear motor (7) mounted on the mounting rod (6); a connecting plate (8) connected to the mover of the linear motor (7); a conical cylinder (9) connected to the connecting plate (8); a connecting frame (10) connected to the top of the mounting frame (1), the connecting frame (10) being located on the side of the mounting rod (6), the bottom of the conical cylinder (9) being in contact with the top of the connecting frame (10), and a straight hole (1001) being opened on the connecting frame (10); a material taking component arranged on the mounting frame (1) for taking the boat (001); and a feeding mechanism arranged on the mounting frame (1) for feeding the tungsten powder raw material.

2. The automatic tungsten powder boat loading machine according to claim 1, characterized in that: The material taking component comprises: a mechanical arm (11) mounted on the top of the mounting frame (1); and a limiting spring piece (12) symmetrically connected to the top of the mounting plate (4), and the limiting spring piece (12) is used to fix the boat (001) placed in the heating frame (5).

3. The automatic tungsten powder boat loading machine according to claim 2, characterized in that: The feeding mechanism comprises: a support frame (13) connected to the mounting frame (1); a charging barrel (14) connected to the top of the support frame (13); a rotating cover (15) rotatably connected to the top of the charging barrel (14); a connecting pipe (16) connected to the bottom of the charging barrel (14); a guide frame (17) connected to the lower end of the connecting pipe (16); a sliding rod (18) symmetrically slidably connected to the guide frame (17); and a baffle (19) slidably connected to the guide frame (17). ), and the baffle (19) is connected to the end of the slide rod (18); a connecting spring (20) is wound around the outside of the slide rod (18), and the two ends of the connecting spring (20) are respectively connected to the end of the slide rod (18) and the side of the guide frame (17); a square plate (21) is connected to the top of the conical cylinder (9), and a through hole (2101) is opened on the square plate (21); a leveling component is arranged on the connecting frame (10) and is used to level the tungsten powder raw material in the boat (001).

4. The automatic tungsten powder boat loading machine according to claim 3, characterized in that: The sweeping assembly comprises: a sliding frame (22) slidably connected to the connecting frame (10), a circular hole (2201) being formed on the top of the sliding frame (22), the lower end of the conical cylinder (9) being located in the circular hole (2201), a square hole (2202) being formed on the sliding frame (22), and the square hole (2202) being located directly below the circular hole (2201); and bristles (23) being connected to the bottom of the sliding frame (22) at intervals, and the bristles (23) being distributed around the square hole (2202).

5. The automatic tungsten powder boat loading machine according to claim 4, characterized in that: Also includes: The two rubber blocks (24) are respectively connected to the side surface of the baffle plate (19) and the side surface of the square plate (21), and the two rubber blocks (24) are in contact with each other.

6. The automatic tungsten powder boat loading machine according to claim 5, characterized in that: Also includes: A fixed plate (25) is symmetrically connected to both sides of the mounting frame (1); a first rotating brush (26) is rotationally connected to the fixed plate (25); a first driving motor (27) is mounted on the side of one of the fixed plates (25), and the output shaft of the first driving motor (27) is connected to the end of the first rotating brush (26); a second rotating brush (28) is symmetrically rotationally connected to the fixed plate (25); a second driving motor (29) is mounted on the side of one of the fixed plates (25), and the output shaft of the second driving motor (29) is connected to the end of one of the second rotating brushes (28); and a pulley assembly (30) is used to transmit power between the two second rotating brushes (28).

7. The automatic tungsten powder boat loading machine according to claim 6, characterized in that: Also includes: The collecting frame (31) is connected to the mounting frame (1), and the collecting frame (31) is located below the first rotating brush (26) and the second rotating brush (28).

8. The automatic tungsten powder boat loading machine according to claim 7, characterized in that: Also includes: a third driving motor (32) mounted on the top of the charging barrel (14); The spiral rod (33) is connected to the output shaft of the third drive motor (32), and the lower end of the spiral rod (33) is located inside the connecting tube (16).

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