Welding equipment for electric automobile shell

Abstract

The invention discloses welding equipment for an electric automobile shell, and relates to the technical field of electric automobile shell welding, the welding equipment comprises a welding robot, one side of the welding robot is provided with a shell mounting seat for placing the electric automobile shell, and the bottom end of the shell mounting seat is provided with a supporting table; a supporting main shaft connected through a bearing is arranged in the supporting table, the supporting main shaft is fixedly connected with the bottom end of the shell mounting base, a rotary switching assembly is mounted on the side, close to the supporting main shaft, in the supporting table, and rotation of the shell mounting base is achieved through starting of the rotary switching assembly; the electric vehicle shell after being welded can rotate to one side of the welding spot online detection mechanism, pre-grinding and online detection of welding spots are achieved through rotary switching of the welding spot grinding mechanism and the ultrasonic welding spot detection probe, the finished product percent of pass of product welding is increased, and the complexity of product reworking can be reduced.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle housing welding technology, specifically a welding device for electric vehicle housings. Background Technology

[0002] The core function of electric vehicle shell welding equipment is to precisely connect various metal components of the shell into an integral structure, while ensuring the structural strength, sealing performance, and lightweight characteristics of the shell. It meets the core requirements of electric vehicles such as safety, range, and waterproofing. Compared with manual welding, it significantly improves the consistency of welding quality, production efficiency, and safety, while also meeting the technical requirements of lightweight, high sealing, and high precision for electric vehicle shells.

[0003] When using the aforementioned electric vehicle shell welding equipment, it is often necessary to remove the welded electric vehicle shell and reinstall it in the testing equipment to inspect the weld points. This results in low monitoring efficiency after welding the electric vehicle shell and the inability to re-weld the electric vehicle shell in a timely manner. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a welding device for electric vehicle housings.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a welding device for an electric vehicle housing, comprising a welding robot, a housing mounting base for placing the electric vehicle housing is provided on one side of the welding robot, a support platform is provided at the bottom end of the housing mounting base, a support spindle connected by bearings is provided inside the support platform, and the support spindle is fixedly connected to the bottom end of the housing mounting base, a rotation switching component is installed inside the support platform near the support spindle, an online weld point detection mechanism is provided on the side of the housing mounting base away from the welding robot, the online weld point detection mechanism includes a movable vertical platform provided on the other side of the housing mounting base, symmetrically distributed electric telescopic cylinders are installed on one side of the movable vertical platform, a slag treatment mechanism is provided at one end of the housing mounting base, and a function switching mechanism is installed on the side of the housing mounting base near the slag treatment mechanism.

[0006] As described above, the movable vertical platform is equipped with a Y-axis adjustment component, and a movable lifting plate is connected to one side of the Y-axis adjustment component. The movable lifting plate is parallel to the movable vertical platform, and a rotation adjustment component is installed inside the movable lifting plate.

[0007] As described above, an x-axis control component is provided on one side of the rotation adjustment component, and both ends of the x-axis control component are connected to z-axis control components, and the two z-axis control components move synchronously.

[0008] As described above, one end of one of the z-axis control components is equipped with a solder joint grinding mechanism, and one end of the other z-axis control component is equipped with an ultrasonic solder joint detection probe.

[0009] The aforementioned welding slag treatment mechanism includes a partition seat located at the center of the housing mounting base, a protective frame fixedly connected to the top of the partition seat, and a rotating internal gear ring slidably connected to the protective frame via a slider inside the protective frame.

[0010] As described above, the end of the x-axis control component is provided with uniformly distributed fixed meshing teeth.

[0011] As described above, one end of the rotating internal gear ring is meshed with a rotating gear, the center of the rotating gear is connected to a rotating shaft, both ends of the rotating shaft are connected to fixed boxes through bearings, and the fixed boxes are fixedly connected to the bottom end of the housing mounting base.

[0012] As described above, a three-toothed sliding plate is provided at one end of the fixed box near the auxiliary gear, and the three-toothed sliding plate is slidably connected to the fixed box. A symmetrically distributed rotating meshing gear is provided at one end of the three-toothed sliding plate away from the auxiliary gear, and the rotating meshing gear is meshed with the three-toothed sliding plate. A rotating shaft is provided at one end of the rotating meshing gear and connected to the fixed box through a bearing. An air vent is provided at the end of the rotating shaft.

[0013] The aforementioned function switching mechanism includes a two-way connecting hose disposed on one side of the air vent. The end of the two-way connecting hose away from the air vent is connected to a switching pipe. Rigid connecting pipes are connected to both sides of the switching pipe. The end of the rigid connecting pipe away from the switching pipe is connected to an equipment mounting frame, and the equipment mounting frame is fixedly connected to the fixed box.

[0014] As described above, the switching tube is internally equipped with a blocking valve plate, which is symmetrically distributed and staggered within the switching tube. One end of each blocking valve plate is fixedly connected to a control rod, the surface of which is equipped with a fixing ring. A control slide rod is fixedly connected to one side of the fixing ring, and a sliding ring is slidably connected to the surface of the control slide rod. Symmetrically distributed electric push rods are installed on one side of the switching tube, and the electric push rods are movably connected to the switching tube. A connecting shaft is movably connected between the electric push rods and the sliding ring.

[0015] Compared with existing technologies, this welding equipment for electric vehicle housings has the following advantages: 1. When using this invention, after welding is completed, the rotating switching component is activated to rotate the welded electric vehicle shell to one side of the online weld detection mechanism. The online weld detection mechanism enables rapid detection of the weld points, allowing for timely re-welding when incorrect or weak weld points are found, thereby improving the product qualification rate and reducing product rework.

[0016] Second, in use, the moving vertical platform can move with the electric telescopic cylinder without affecting the rotation of the housing mounting base. When the moving vertical platform reaches the designed working position, the activation of the welding slag treatment mechanism can rotate the air vent at the top. After rotation, the air vent can be aligned with the clamped electric vehicle housing. At the same time, the blower is activated to blow away the polished welding slag. This ensures that the polished welding slag has been cleaned when the ultrasonic weld point detection probe rotates to the working position, improving the accuracy of detection and avoiding missed or false detections.

[0017] Third, this invention uses an electric push rod, activated by a controller, to push a sliding ring connected to the output end. This causes the sliding ring to synchronously apply thrust to the control rod, resulting in the rotation of the control rod and the sealing valve plate. After rotation, one side of each sealing valve plate remains sealed, thus enabling the opening and closing of both ends. The activation of the blower and induced draft fan facilitates the cleaning of welding slag and the absorption of gas from the air vents. This not only improves the working environment but also facilitates the handling of welding slag, enhancing the online detection of electric vehicle housings and optimizing the environment in electric vehicle welding equipment.

[0018] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from an examination of the following, or may be learned from the practice of the invention. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the rotary switching component of the present invention; Figure 3 This is a three-dimensional cross-sectional view of the online weld joint detection mechanism of the present invention; Figure 4 This is a three-dimensional structural diagram of the housing mounting base of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the protective frame of the present invention; Figure 6 This is a three-dimensional cross-sectional view of the fixing box of the present invention; Figure 7 This is a three-dimensional structural diagram of the two-way, one-connecting flexible hose of the present invention; Figure 8 This is a three-dimensional cross-sectional view of the switching tube of the present invention; Figure 9 This is a three-dimensional structural diagram of the sealing valve plate of the present invention.

[0020] In the diagram: 1. Welding robot; 2. Housing mounting base; 3. Support platform; 4. Support spindle; 5. Rotation switching assembly; 6. Online weld spot detection mechanism; 601. Moving vertical platform; 602. Electric telescopic cylinder; 603. Y-axis control assembly; 604. Movable lifting plate; 605. Rotation adjustment assembly; 606. X-axis control assembly; 607. Z-axis control assembly; 608. Weld spot grinding mechanism; 609. Ultrasonic weld spot detection probe; 7. Weld slag treatment mechanism; 701. Separator; 702. Protective frame; 703. Rotating internal gear ring; 7 04. Fixed meshing gear; 705. Rotary gear; 706. Rotating shaft; 707. Fixed box; 708. Auxiliary gear; 709. Three-tooth sliding plate; 710. Rotating meshing gear; 711. Rotating shaft; 712. Air outlet; 8. Function switching mechanism; 801. Two-way one-way connecting hose; 802. Switching pipe; 803. Rigid connecting pipe; 804. Equipment mounting frame; 805. Sealing valve plate; 806. Control rod; 807. Fixed ring; 808. Control slide rod; 809. Sliding ring; 810. Electric push rod; 811. Connecting shaft. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1-9 As shown, the present invention provides a technical solution: a welding device for an electric vehicle shell, including a welding robot 1, a shell mounting base 2 for placing the electric vehicle shell is provided on one side of the welding robot 1, a support platform 3 is provided at the bottom end of the shell mounting base 2, a support spindle 4 connected by bearings is provided inside the support platform 3, and the support spindle 4 is fixedly connected to the bottom end of the shell mounting base 2, a rotation switching component 5 is installed inside the support platform 3 near the support spindle 4, an online weld point detection mechanism 6 is provided on the side of the shell mounting base 2 away from the welding robot 1, the online weld point detection mechanism 6 includes a movable vertical platform 601 provided on the other side of the shell mounting base 2, symmetrically distributed electric telescopic cylinders 602 are installed on one side of the movable vertical platform 601, a slag treatment mechanism 7 is provided at one end of the shell mounting base 2, and a function switching mechanism 8 is installed on the side of the shell mounting base 2 near the slag treatment mechanism 7.

[0023] The movable vertical platform 601 is equipped with a Y-axis control component 603. A movable lifting plate 604 is connected to one side of the Y-axis control component 603. The movable lifting plate 604 is parallel to the movable vertical platform 601. A rotation adjustment component 605 is installed inside the movable lifting plate 604.

[0024] An x-axis control component 606 is provided on one side of the rotation adjustment component 605. Both ends of the x-axis control component 606 are connected to z-axis control components 607, and the two z-axis control components 607 move synchronously.

[0025] One end of a z-axis control component 607 is equipped with a solder joint grinding mechanism 608, and the other end of a z-axis control component 607 is equipped with an ultrasonic solder joint detection probe 609.

[0026] Both the rotation switching component 5 and the rotation adjustment component 605 are composed of a rotation drive servo motor and a meshing gear set. The rotation switching component 5 can realize the rotation of the support spindle 4 by the meshing gear set after the rotation drive servo motor is powered on by an external power source. The top end of the support spindle 4 is fixedly connected to the bottom end of the housing mounting base 2, so synchronous rotation can be achieved.

[0027] The Y-axis control assembly 603, x-axis control assembly 606, and z-axis control assembly 607 are all composed of an internal lead screw, a control servo motor, and a displacement nut seat. They can achieve rapid switching between x-axis and z-axis movement after power-on. Furthermore, the lead screws inside the two z-axis control assemblies 607 share the same control servo motor via a synchronous belt, achieving synchronous movement.

[0028] The solder joint grinding mechanism 608 consists of a grinding drive servo motor, an output shaft, and a grinding wheel. It can rotate after being connected to an external power source, and can quickly process solder joints at different positions through the adjustment of the Y-axis adjustment component 603, the x-axis adjustment component 606, and the z-axis adjustment component 607.

[0029] The ultrasonic weld point detection probe 60 uses a commercially available ultrasonic weld point detection probe, but other models can also be selected according to usage requirements and needs. The ultrasonic waves propagate in the upper and lower plates and weld nuggets, and are reflected multiple times through the interface between the plates, the weld nugget boundary, and the bottom of the plate to form multiple sets of echoes. The echoes are then received and converted into electrical signals. Because of the large grain size of qualified weld nuggets, the sound waves attenuate quickly, and the echo amplitude decreases rapidly. It can quickly determine whether it is a qualified weld point, whether the penetration depth is insufficient, whether the weld nugget is too small, whether there is a cold weld, or whether there is a missing weld. In addition, when unqualified weld points are found, the rotation switching component 5 can be used to quickly return to the welding position.

[0030] Working principle of the online weld joint inspection mechanism 6: In use, the rotary switching component 5 can be started after welding is completed, so that the rotary switching component 5 can drive the supporting main shaft 4, and the supporting main shaft 4 can rotate the housing mounting base 2 connected to the top. After the housing mounting base 2 rotates, the welded electric vehicle housing can be rotated to one side of the weld point online detection mechanism 6. By starting the electric telescopic cylinder 602, it can move the movable vertical platform 601 connected to the output end. Then, through the coordinated operation of the Y-axis control component 603, the rotation adjustment component 605, the x-axis control component 606 and the z-axis control component 607, the rotation switching between the weld point grinding mechanism 608 and the ultrasonic weld point detection probe 609 can be realized. The welding point grinding mechanism 608 can grind the welding slag at the welding point, avoiding excessive welding slag from affecting the accuracy of the test. The rotation of the rotating switching component 5 can switch the housing mounting seat 2 to the electric vehicle housing. It enables rapid online inspection of the welded electric vehicle body, allowing for timely re-welding if incorrect or weak welds are found, thereby improving product pass rate and reducing product rework.

[0031] The welding slag treatment mechanism 7 includes a partition seat 701 located at the center of the housing mounting base 2. A protective frame 702 is fixedly connected to the top of the partition seat 701. A rotating internal gear ring 703 is slidably connected to the protective frame 702 via a slider.

[0032] The x-axis control assembly 606 has uniformly distributed fixed meshing teeth 704 at its end.

[0033] A rotating gear 705 is meshed with one end of the rotating internal gear ring 703. A rotating shaft 706 is connected to the center of the rotating gear 705. Both ends of the rotating shaft 706 are connected to a fixed box 707 through bearings, and the fixed box 707 is fixedly connected to the bottom end of the housing mounting base 2.

[0034] Inside the fixed housing 707, near the auxiliary gear 708, there is a meshing three-tooth slide plate 709, and the three-tooth slide plate 709 is slidably connected to the fixed housing 707. At the end of the three-tooth slide plate 709 away from the auxiliary gear 708, there are symmetrically distributed rotating meshing gears 710, and the rotating meshing gears 710 are meshing with the three-tooth slide plate 709. At one end of the rotating meshing gears 710, there is a rotating shaft 711 connected to the fixed housing 707 via a bearing. At the end of the rotating shaft 711, there is a fixedly connected air vent 712.

[0035] Working principle of welding slag treatment mechanism 7: During use, the movement of the electric telescopic cylinder 602 allows the moving vertical platform 601 to remain unaffected by the rotation of the housing mounting base 2. When the moving vertical platform 601 reaches the designed working position, the fixed meshing teeth 704 at the end of the x-axis control component 606 can mesh with the rotating internal gear ring 703, thereby enabling the rotation of the rotating internal gear ring 703 during the position switching process between the weld point grinding mechanism 608 and the ultrasonic weld point detection probe 609. Furthermore, as the internal gear ring 703 rotates, the rotating gear 705 connected at one end can rotate synchronously. As the rotating gear 705 rotates synchronously, the rotating shaft 706 can drive the auxiliary gear 708 connected at both ends to rotate. In turn, as the auxiliary gear 708 rotates, the three-tooth slide plate 709 meshing at the bottom end can move. The three-tooth slide plate 709 has evenly distributed tooth blocks on both sides and the top surface, which can realize the rotation of the meshing gears 710 on both sides during movement. As the meshing gears 710 rotate, the air vent 712 at the top can be rotated through the connected rotating shaft 711. After rotation, the air vent 712 can be aligned with the clamped electric vehicle housing. At the same time, by starting the blower, the polished welding slag is blown away, so that when the ultrasonic weld point detection probe 609 rotates to the working position, the polished welding slag has been cleaned up, improving the accuracy of the detection and avoiding missed or false detections.

[0036] The function switching mechanism 8 includes a two-way connecting hose 801 located on one side of the air outlet 712. The end of the two-way connecting hose 801 away from the air outlet 712 is connected to a switching pipe 802. Rigid connecting pipes 803 are connected to both sides of the switching pipe 802. The end of the rigid connecting pipe 803 away from the switching pipe 802 is connected to an equipment mounting frame 804, and the equipment mounting frame 804 is fixedly connected to the fixed box 707.

[0037] The switching tube 802 is equipped with a blocking valve plate 805. The blocking valve plates 805 are symmetrically distributed inside the switching tube 802 and are staggered inside the switching tube 802. One end of the blocking valve plate 805 is equipped with a fixed control rod 806. The surface of the control rod 806 is equipped with a fixing ring 807. One side of the fixing ring 807 is equipped with a fixed control slide rod 808. The surface of the control slide rod 808 is slidably connected with a sliding ring 809. One side of the switching tube 802 is equipped with symmetrically distributed electric push rods 810. The electric push rods 810 and the switching tube 802 are movably connected. The electric push rods 810 and the sliding ring 809 are movably connected with a connecting shaft 811.

[0038] The equipment mounting frames 804 are symmetrically distributed at one end of the fixed box 707, and the fixed box 707 is also symmetrically distributed at the bottom of the housing mounting base 2. A blower and an induced draft fan are respectively installed inside the equipment mounting frames 804 on both sides of the fixed box 707, and one end of the induced draft fan is also connected to a gas treatment device. Through the activated carbon plate and other treatment and adsorption materials in the gas treatment device, the odor generated during the welding of the electric vehicle housing can be adsorbed and improved.

[0039] Working principle of function switching mechanism 8: After the electric push rod 810 is started by the controller, it pushes the sliding ring 809 connected to the output end, so that the sliding ring 809 applies a thrust to the control slide rod 808 in sync, thereby making the control slide rod 808 rotate. The two electric push rods 810 can be started and stopped synchronously by a synchronizer. Furthermore, the sliding ring 809 can slide on the surface of the regulating slide rod 808, and as the regulating slide rod 808 rotates, the connected fixed ring 807 and the regulating rod 806 can rotate synchronously, thereby enabling the sealing valve plate 805 connected to the regulating rod 806 to achieve rotational switching inside the switching tube 802. Because the two blocking valve plates 805 are misaligned inside the switching tube 802, and the farthest point of the output end of the electric push rod 810 can only make the control rod 806 rotate 90° with the blocking valve plate 805. Therefore, after rotation, one side of the two sealing valve plates 805 is always in a sealed state, thereby realizing the opening and closing of both ends and the switching between suction and blowing functions. Both sides of the switching pipe 802 are connected to rigid connecting pipes 803. The rigid connecting pipes 803 are respectively connected to the equipment mounting frame 804, which is equipped with a blower and an induced draft fan. After the sealing valve plate 805 on the blower side is opened, the welding slag can be cleaned through the rotated air outlet 712. When the sealing valve plate 805 on one side of the induced draft fan is opened, gas can be drawn in. Therefore, the electric vehicle housing placed on both sides of the housing mounting base 2 can absorb the gas during welding and blow out the welding slag during the welding and inspection processes, respectively. In addition, a gas treatment device (not shown in the figure) is connected to one side of the induced draft fan through a pipe, which not only improves the working environment but also facilitates the treatment of welding slag, improves the online inspection of the electric vehicle housing by the electric vehicle welding equipment, and optimizes the environment.

[0040] This invention achieves the following through the coordinated operation of the online weld joint detection mechanism 6, the weld slag treatment mechanism 7, and the function switching mechanism 8: The rotation of the housing mounting base 2 enables rapid online inspection of the electric vehicle housing; The partition seat 701 can separate two processing areas, enabling welding and inspection to be carried out simultaneously; The linkage operation of the weld spot grinding mechanism 608 and the ultrasonic weld spot detection probe 609 during rotation enables the air direction adjustment of the air outlet 712, and achieves the functions of blowing away welding slag and absorbing odors during rotation. The two air vents 712 can be simultaneously circulated by connecting the two-way hose 801; The synchronous rotation of the two sealing valve plates 805 can always maintain the advantage of one side being sealed while the other side is flowing.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding apparatus for an electric vehicle shell comprising a welding robot (1), characterized in that: The welding robot (1) has a housing mounting base (2) for placing the electric vehicle housing on one side. The housing mounting base (2) has a support platform (3) at its bottom end. The support platform (3) has a support spindle (4) connected by bearings inside it. The support spindle (4) is fixedly connected to the bottom end of the housing mounting base (2). A rotary switching component (5) is installed inside the support platform (3) on the side close to the support spindle (4). The housing mounting base (2) away from the welding robot (1) has an online weld detection mechanism (6). The online weld detection mechanism (6) includes a movable vertical platform (601) on the other side of the housing mounting base (2). Symmetrically distributed electric telescopic cylinders (602) are installed on one side of the movable vertical platform (601). A slag treatment mechanism (7) is provided at one end of the housing mounting base (2), and a function switching mechanism (8) is installed on the side of the housing mounting base (2) near the slag treatment mechanism (7).

2. The welding equipment for electric vehicle housings according to claim 1, characterized in that: The movable vertical platform (601) is equipped with a Y-axis control component (603). A movable lifting plate (604) is connected to one side of the Y-axis control component (603), and the movable lifting plate (604) is parallel to the movable vertical platform (601). A rotation adjustment component (605) is installed inside the movable lifting plate (604).

3. The welding equipment for electric vehicle housings according to claim 2, characterized in that: An x-axis control component (606) is provided on one side of the rotation adjustment component (605), and both ends of the x-axis control component (606) are connected to z-axis control components (607), and the two z-axis control components (607) move synchronously.

4. The welding equipment for electric vehicle housing according to claim 3, characterized in that: One end of one of the z-axis control components (607) is equipped with a solder joint grinding mechanism (608), and the other end of the z-axis control component (607) is equipped with an ultrasonic solder joint detection probe (609).

5. The welding equipment for electric vehicle housings according to claim 1, characterized in that: The welding slag treatment mechanism (7) includes a partition seat (701) located at the center of the housing mounting base (2). A protective frame (702) is fixedly connected to the top of the partition seat (701). A rotating internal gear ring (703) is slidably connected to the protective frame (702) through a slider.

6. The welding equipment for electric vehicle housings according to claim 5, characterized in that: The x-axis control component (606) is provided with uniformly distributed fixed meshing teeth (704) at its end.

7. The welding equipment for electric vehicle housings according to claim 5, characterized in that: One end of the rotating internal gear ring (703) is meshed with a rotating gear (705), and a rotating shaft (706) is connected to the center of the rotating gear (705). Both ends of the rotating shaft (706) are connected to a fixed box (707) through bearings, and the fixed box (707) is fixedly connected to the bottom end of the housing mounting base (2). Auxiliary gears (708) are provided at both ends of the rotating shaft (706).

8. The welding equipment for electric vehicle housings according to claim 7, characterized in that: Inside the fixed box (707), near the auxiliary gear (708), there is a three-tooth sliding plate (709) that is engaged with the fixed box (707). The three-tooth sliding plate (709) is slidably connected to the fixed box (707). At the end of the three-tooth sliding plate (709) away from the auxiliary gear (708), there are symmetrically distributed rotating meshing gears (710). The rotating meshing gears (710) are engaged with the three-tooth sliding plate (709). At one end of the rotating meshing gears (710), there is a rotating shaft (711) connected to the fixed box (707) via a bearing. At the end of the rotating shaft (711), there is a fixedly connected air vent (712).

9. A welding device for an electric vehicle housing according to claim 8, characterized in that: The function switching mechanism (8) includes a two-way one-way connecting hose (801) disposed on one side of the air outlet (712). The end of the two-way one-way connecting hose (801) away from the air outlet (712) is connected to a switching pipe (802). Rigid connecting pipes (803) are connected to both sides of the switching pipe (802). The end of the rigid connecting pipe (803) away from the switching pipe (802) is connected to an equipment mounting frame (804), and the equipment mounting frame (804) is fixedly connected to the fixed box (707).

10. The welding equipment for an electric vehicle housing according to claim 9, characterized in that: The switching tube (802) is provided with a blocking valve plate (805) inside. The blocking valve plates (805) are symmetrically distributed inside the switching tube (802) and staggered inside the switching tube (802). One end of the blocking valve plate (805) is provided with a fixedly connected control rod (806). The surface of the control rod (806) is provided with a fixing ring (807). One side of the fixing ring (807) is provided with a fixedly connected control slide rod (808). The surface of the control slide rod (808) is slidably connected with a sliding ring (809). One side of the switching tube (802) is equipped with symmetrically distributed electric push rods (810), and the electric push rods (810) are movably connected to the switching tube (802). The electric push rods (810) and the sliding rings (809) are movably connected with a connecting shaft (811).

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