Invasive casting auxiliary device

Abstract

An intrusive casting auxiliary device relates to the technical field of auxiliary equipment for hot forging, and is characterized in that a groove is formed in the inner wall of the bottom end of a main body frame, and an iron clothes placing mechanism is mounted in the groove; according to the intrusive casting auxiliary device, an iron garment is placed through the iron garment placing mechanism, an iron core needing to be wrapped and clamped is clamped through the iron core clamping mechanism, and the iron core moving mechanism drives the iron core clamping mechanism clamping the iron core to move; the iron core moving mechanism can drive the iron clothes forming transmission mechanism to work during working, the iron clothes forming transmission mechanism drives the iron clothes placing mechanism where the iron clothes are placed to work, the iron clothes are extruded into a U shape through the iron clothes placing mechanism, and the situation that the iron clothes are distorted when being changed into the U shape is avoided; the iron core is inserted into the iron clothing through the iron core moving mechanism, and the iron core is tightly pressed into the iron clothing through the iron core moving mechanism, so that a gap between the iron core and the iron clothing is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of auxiliary equipment for hot forging, and in particular to an invasive casting auxiliary device. Background Art

[0002] During the hot forging process, in order to increase the toughness of the product, iron-clad hot forging will be carried out. During the forging process, the iron core will be wrapped with iron armor for forging. The red-hot iron armor will be hammered into a U shape, and then the iron core will be placed in the hammered iron armor. When the iron core is placed in the iron armor, there will be a certain gap between one side of the iron core and the bottom of the U-shaped groove of the iron armor. After forming, gaps will appear between the iron embryos, affecting the hardness of the iron embryos. The staff needs to use a grinder to perform secondary processing on these gaps. At the same time, the staff holds the iron armor in one hand and the iron core in the other hand, and then places the iron core into the iron armor. The iron core is easy to fall off during the placement process. The iron armor is hammered into a U shape. During the hammering process, the iron armor is not in a vertical state. It is inconvenient for the staff to insert the iron core into the iron armor during placement, and the iron core is easy to fall off. Summary of the invention

[0003] In order to overcome the shortcomings in the background technology, the present invention discloses an invasive casting auxiliary device, which places iron clads through an iron clad placing mechanism, clamps the iron core that needs to be clamped through an iron core clamping mechanism, drives the iron core clamping mechanism that clamps the iron core to move through the iron core moving mechanism, and the iron core moving mechanism drives the iron clad forming transmission mechanism to work when working, and drives the iron clad placing mechanism with the iron clad placed to work through the iron clad forming transmission mechanism, squeezes the iron clad into a U shape through the iron clad placing mechanism to avoid distortion of the iron clad when it becomes U-shaped, inserts the iron core into the iron clad through the iron core moving mechanism, and presses the iron core tightly into the iron clad through the iron core moving mechanism to avoid gaps between the iron core and the iron clad.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme: An invasive casting auxiliary device includes a main frame, a groove is provided on the inner wall of the bottom end of the main frame, and an iron clothing placement mechanism is installed in the groove, an iron core moving mechanism and an iron clothing forming transmission mechanism are installed on the top frame wall of the main frame, and the driving end of the iron core moving mechanism is connected to the driving end of the iron clothing forming transmission mechanism, and the moving end of the iron clothing forming transmission mechanism is connected to the flipping end of the iron clothing placement mechanism, an iron core clamping mechanism is installed on the moving end of the iron core moving mechanism, and the position of the iron core clamping mechanism corresponds to the position of the iron clothing placement mechanism, a reset mechanism is installed on the inner wall of the top end of the main frame, and the moving end of the reset mechanism is connected to the moving end of the iron core moving mechanism, a power switch group is installed on the main frame, and the input end of the power switch group is connected to the output end of an external power supply, and the power supply output end of the power switch group is electrically connected to the power supply output end of the iron core moving mechanism and the reset mechanism respectively.

[0005] A mounting groove and two slide grooves are arranged in the frame wall at the top of the main frame, the driving ends of the iron core moving mechanism and the iron clothing forming transmission mechanism are both located in the mounting groove, and the mounting groove is connected with the two slide grooves.

[0006] The iron clothing placement mechanism includes a supporting block, a placing plate, a limiting plate and a flipping plate. The supporting block is located in a groove in the main frame and is fixedly connected, and the placing plate is fixedly connected to the supporting block. Rotating grooves are respectively provided on the two side wall surfaces of the placing plate, and a flipping plate is rotatably connected in the rotating groove. The flipping plate is connected to the moving end of the iron clothing forming transmission mechanism, and limiting plates are respectively fixedly connected on both sides of the upper surface of the placing plate, and a slot is provided in the middle position of one of the limiting plates.

[0007] Two transmission grooves are arranged on one side of the flip plate away from the support block, and a fixed rod is fixedly connected in the transmission groove, a rotating ring is rotatably connected to the fixed rod, and the rotating ring is connected to the moving end of the iron clothing forming transmission mechanism.

[0008] The iron core moving mechanism includes a third screw, a servo motor, a second bevel gear, a third bevel gear, a fixed plate and a fourth bevel gear. The number of the third screws is two, and the two third screws are both located on the main frame and threadedly connected, and the bottom end of the third screw is rotatably connected to the iron core clamping mechanism, the third screw is threadedly connected to the third bevel gear, and the third bevel gear is located in the mounting groove on the main frame and rotatably connected, the servo motor is located in the mounting groove on the main frame and fixedly connected, and the servo motor is connected to the second bevel gear through the motor shaft, the second bevel gear is meshed with the third bevel gear, the fixed plate is located in the mounting groove on the main frame and fixedly connected, and the fixed plate is rotatably connected with a connecting rod, and the two ends of the connecting rod are respectively fixedly connected with the fourth bevel gears, and the two fourth bevel gears are respectively meshed with the third bevel gear and the driving end of the iron clothing forming transmission mechanism.

[0009] The iron clothing forming transmission mechanism includes a first screw, a second screw, an internally threaded sleeve, a first bevel gear and a moving block. There are two first screws, and the two first screws are both located in the mounting grooves on the main frame and are rotatably connected. The middle position of the first screw is fixedly connected with a first bevel gear, and the first bevel gear is meshed with one of the fourth bevel gears. Two moving blocks are threadedly connected to the first screw, and the two moving blocks are respectively located on both sides of the first bevel gear. The moving block is rotatably connected with an internally threaded sleeve, and the internally threaded sleeve is internally threaded with the second screw, and the bottom end of the second screw is connected to a rotating ring.

[0010] A gear ring is fixedly connected to the outer wall of the internal threaded sleeve, and the gear ring is meshed and connected with the rack. The rack is located in a sliding groove on the main frame and is fixedly connected.

[0011] The threads of the first screw rod on both sides of the first bevel gear are oriented in opposite directions, controlling the moving blocks on both sides to move inward or outward at the same time.

[0012] The iron core clamping mechanism includes a movable plate, a sliding rod, a spring and a contact plate. The movable plate is located at the bottom end of the third screw rod and is rotatably connected, and two through slots are provided on the movable plate. The sliding rod is fixedly connected in the through slot, and a spring is sleeved on the sliding rod. One end of the spring is fixedly connected to the slot wall of the through slot, and the other end of the spring is connected to the contact plate. The contact plate is located in the through slot and is slidably connected. The position of the movable plate corresponds to the position of the placement plate.

[0013] The reset mechanism includes an electric telescopic rod, a connecting plate and an internal threaded ring. The number of the electric telescopic rods is two groups, and the number of each group of electric telescopic rods is two. The two groups of electric telescopic rods are located on the inner wall of the top end of the main frame and are fixedly connected. The telescopic end of the electric telescopic rod is fixedly connected with a connecting plate, and an internal threaded ring is fixedly connected between the two connecting plates. The position of the internal threaded ring corresponds to the position of the third screw and is threadedly connected.

[0014] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: The invasive casting auxiliary device described in the present invention places iron clads through an iron clad placing mechanism, clamps an iron core to be clamped through an iron core clamping mechanism, drives the iron core clamping mechanism holding the iron core to move through an iron core moving mechanism, and the iron core moving mechanism drives the iron clad forming transmission mechanism to work when working, and drives the iron clad placing mechanism with the iron clad placed thereon to work through the iron clad forming transmission mechanism, squeezes the iron clad into a U-shape through the iron clad placing mechanism to avoid distortion of the iron clad when it becomes U-shaped, inserts the iron core into the iron clad through the iron core moving mechanism, and presses the iron core tightly into the iron clad through the iron core moving mechanism to avoid gaps between the iron core and the iron clad. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 is a first cross-sectional view of the present invention; Figure 3 for Figure 2 A schematic diagram of the enlarged structure of the present invention; Figure 4 is a second cross-sectional view of the present invention; Figure 5 for Figure 4 A schematic diagram of the enlarged structure of position B of the present invention; Figure 6 for Figure 4 The enlarged structural diagram of the C position of the present invention; 1. Main frame; 2. Power switch group; 3. Iron clothing placement mechanism; 301. Support block; 302. Placement plate; 303. Limit plate; 304. Turning plate; 4. Iron core clamping mechanism; 401. Moving plate; 402. Sliding rod; 403. Spring; 404. Contact plate; 5. Iron clothing forming transmission mechanism; 501. First screw; 502. Second screw; 503. Internal threaded sleeve; 504. First bevel gear; 505. Gear ring; 506. Moving block; 507. Rack; 6. Iron core moving mechanism; 601. Third screw; 602. Servo motor; 603. Second bevel gear; 604. Third bevel gear; 605. Fixed plate; 606. Fourth bevel gear; 7. Reset mechanism; 701. Electric telescopic rod; 702. Connecting plate; 703. Internal threaded ring. DETAILED DESCRIPTION

[0016] The present invention can be explained in detail by the following examples, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0017] Combined with Figures 1 to 3The invasive casting auxiliary device comprises a main frame 1, a groove is provided on the inner wall of the bottom end of the main frame 1, and an iron clothing placement mechanism 3 is installed in the groove, an iron core moving mechanism 6 and an iron clothing forming transmission mechanism 5 are installed on the top frame wall of the main frame 1, and the driving end of the iron core moving mechanism 6 is connected to the driving end of the iron clothing forming transmission mechanism 5, and the moving end of the iron clothing forming transmission mechanism 5 is connected to the flip end of the iron clothing placement mechanism 3, and an iron core clamping mechanism 4 is installed on the moving end of the iron core moving mechanism 6, and the position of the iron core clamping mechanism 4 corresponds to the position of the iron clothing placement mechanism 3, so A reset mechanism 7 is installed on the inner wall at the top of the main frame 1, and the moving end of the reset mechanism 7 is connected to the moving end of the iron core moving mechanism 6. A power switch group 2 is installed on the main frame 1, and the input end of the power switch group 2 is connected to the output end of the external power supply. The power supply output end of the power switch group 2 is electrically connected to the power supply output ends of the iron core moving mechanism 6 and the reset mechanism 7 respectively. The power switch group 2 is provided with switch buttons corresponding to all electrical equipment in the iron core moving mechanism 6 and the reset mechanism 7, and all electrical equipment in the iron core moving mechanism 6 and the reset mechanism 7 are controlled to work through the switch buttons.

[0018] A mounting groove and two slide grooves are provided in the frame wall at the top of the main frame 1, and the driving ends of the iron core moving mechanism 6 and the iron clothing forming transmission mechanism 5 are both located in the mounting groove, and the mounting groove is connected to the two slide grooves.

[0019] The iron armor placement mechanism 3 includes a support block 301, a placement plate 302, a limit plate 303 and a flip plate 304. The support block 301 is located in a groove in the main frame 1 and is fixedly connected, and the placement plate 302 is fixedly connected to the support block 301. The two side wall plates of the placement plate 302 are respectively provided with a rotating groove, and the flip plate 304 is rotatably connected in the rotating groove. The flip plate 304 is connected to the moving end of the iron armor forming transmission mechanism 5. The two sides of the upper surface of the placement plate 302 are respectively fixedly connected with the limit plates 303, and a slot is provided in the middle position of one of the limit plates 303, and the steel bars connected to the iron armor are limited by the slot.

[0020] Two transmission grooves are provided on one side of the flip plate 304 away from the support block 301 , and a fixed rod is fixedly connected in the transmission groove, a rotating ring is rotatably connected to the fixed rod, and the rotating ring is connected to the moving end of the iron clothing forming transmission mechanism 5 .

[0021] The iron core moving mechanism 6 includes a third screw rod 601, a servo motor 602, a second bevel gear 603, a third bevel gear 604, a fixing plate 605 and a fourth bevel gear 606. The number of the third screw rods 601 is two. The two third screw rods 601 are both located on the main frame 1 and threadedly connected, and the bottom end of the third screw rod 601 is rotatably connected to the iron core clamping mechanism 4. The third screw rod 601 is threadedly connected to the third bevel gear 604, and the third bevel gear 604 is located in the mounting groove on the main frame 1 and is rotatably connected. The servo motor 602 is located in the mounting groove on the main frame 1 and is fixedly connected, and the servo motor 602 is connected to the second bevel gear through the motor shaft. 603 is connected, the second bevel gear 603 is meshed with the third bevel gear 604, the fixed plate 605 is located in the mounting groove on the main frame 1 and is fixedly connected, and a connecting rod is rotatably connected to the fixed plate 605, and the two ends of the connecting rod are respectively fixedly connected with a fourth bevel gear 606, the two fourth bevel gears 606 are respectively meshed with the third bevel gear 604 and the driving end of the iron clothing forming transmission mechanism 5, after the third screw rod 601 moves to the lowest end, the third screw rod 601 will disengage from the third bevel gear 604, and when it needs to be reset, the third screw rod 601 is driven to reset through the reset mechanism 7, and the third screw rod 601 is re-engaged with the third bevel gear 604.

[0022] The iron clothing forming transmission mechanism 5 includes a first screw rod 501, a second screw rod 502, an internally threaded sleeve 503, a first bevel gear 504 and a moving block 506. The number of the first screw rods 501 is two. The two first screw rods 501 are both located in the mounting groove on the main frame 1 and are rotatably connected, and the first bevel gear 504 is fixedly connected to the middle position of the first screw rod 501. The first bevel gear 504 is meshingly connected with one of the fourth bevel gears 606. Two moving blocks 506 are threadedly connected to the first screw rod 501, and the two moving blocks 506 are respectively located on both sides of the first bevel gear 504. The moving block 506 is rotatably connected with an internally threaded sleeve 503, and the internally threaded sleeve 503 is internally threaded with the second screw rod 502, and the bottom end of the second screw rod 502 is connected to the rotating ring.

[0023] A gear ring 505 is fixedly connected to the outer wall of the internally threaded sleeve 503, and the gear ring 505 is meshed with a rack 507. The rack 507 is located in a slide groove on the main frame 1 and is fixedly connected. The internally threaded sleeve 503 rotates through the gear ring 505 and the rack 507 during movement, and the extension and retraction of the second screw 502 is controlled by the rotation of the internally threaded sleeve 503.

[0024] The threads of the first screw 501 on both sides of the first bevel gear 504 are oriented in opposite directions, so as to control the moving blocks 506 on both sides to move inward or outward at the same time.

[0025] The core clamping mechanism 4 includes a movable plate 401, a sliding rod 402, a spring 403 and a contact plate 404. The movable plate 401 is located at the bottom end of the third screw rod 601 and is rotatably connected, and two through grooves are provided on the movable plate 401. The sliding rod 402 is fixedly connected in the through groove, and the spring 403 is sleeved on the sliding rod 402. One end of the spring 403 is fixedly connected to the groove wall of the through groove, and the other end of the spring 403 is connected to the contact plate 404. The contact plate 404 is located in the through groove and is slidably connected. The position of the movable plate 401 corresponds to the position of the placement plate 302.

[0026] The reset mechanism 7 includes an electric telescopic rod 701, a connecting plate 702 and an internal threaded ring 703. The number of the electric telescopic rods 701 is two groups, and the number of each group of electric telescopic rods 701 is two. The two groups of electric telescopic rods 701 are located on the inner wall of the top of the main frame 1 and are fixedly connected. The connecting plate 702 is fixedly connected to the telescopic end of the electric telescopic rod 701, and an internal threaded ring 703 is fixedly connected between the two connecting plates 702. The position of the internal threaded ring 703 corresponds to the position of the third screw 601 and is threadedly connected.

[0027] The invasive casting auxiliary device is described. When in use, the staff places the red-hot iron armor on the placement plate 302, and places the iron core to be wrapped between the two contact plates 404, and pushes the contact plate 404 through the spring 403 to make the contact plate 404 closely contact with the two ends of the iron core to clamp the iron core, and start the servo motor 602 through the power switch group 2. The servo motor 602 drives the third bevel gear 604 to rotate through the second bevel gear 603. The third bevel gear 604 drives the third screw 601 and the fourth bevel gear 606 to work during the rotation process. The iron core clamping mechanism 4 holding the iron core is driven to move downward by the third screw 601 to press the iron core onto the iron armor to avoid a gap between the iron core and the iron armor. The fourth bevel gear 606 will drive the first screw 501 fixed with the first bevel gear 504 to rotate during the rotation process, and the two moving blocks 506 are driven inward at the same time through the rotation of the first screw 501. Or move outward at the same time, drive the internal threaded sleeve 503 to move through the moving block 506, and the internal threaded sleeve 503 rotates through the gear ring 505 and the rack 507 during the movement, and the second screw 502 is controlled to shrink by the rotation of the internal threaded sleeve 503, and the flip plate 304 is flipped by the contraction of the second screw 502 and the movement of the internal threaded sleeve 503, and the iron armor is bent by the flip plate 304 so that the iron armor is U-shaped to wrap the iron core, and the iron armor is pushed by the flip plate 304 so that the iron armor is in close contact with the iron core, and the third screw 601 is driven to move up by the contraction of the electric telescopic rod 701, and the third bevel gear 604 is driven to reverse by the reversal of the servo motor 602, and the third screw 601 is controlled to move up by the reversal of the third bevel gear 604, so that the iron core is separated from the iron core clamping mechanism 4, and the flip plate 304 is separated from the iron armor by the reversal of the servo motor 602, so that the staff can take out the wrapped iron blank conveniently.

[0028] The parts of the present invention that are not described in detail are prior art. Although the present invention is specifically demonstrated and introduced in conjunction with the preferred implementation scheme, there are many methods and approaches to specifically implement the technical solution. The above is only a preferred implementation scheme of the present invention, but technical personnel in the relevant field should understand that various changes can be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined in the attached claims, and all of them are within the scope of protection of the present invention.

Claims

1. An invasive casting auxiliary device, comprising a main frame (1), characterized in that: The bottom inner wall of the main frame (1) is provided with a groove, and an iron clothing placement mechanism (3) is installed in the groove. The top frame wall of the main frame (1) is provided with an iron core moving mechanism (6) and an iron clothing forming transmission mechanism (5). The driving end of the iron core moving mechanism (6) is connected to the driving end of the iron clothing forming transmission mechanism (5). The moving end of the iron clothing forming transmission mechanism (5) is connected to the flip end of the iron clothing placement mechanism (3). The moving end of the iron core moving mechanism (6) is provided with an iron core clamping mechanism (4). The position of the core clamping mechanism (4) corresponds to the position of the iron armor placing mechanism (3); a reset mechanism (7) is installed on the inner wall of the top end of the main frame (1), and the moving end of the reset mechanism (7) is connected to the moving end of the iron core moving mechanism (6); a power switch group (2) is installed on the main frame (1), and the input end of the power switch group (2) is connected to the output end of the external power supply, and the power supply output end of the power switch group (2) is electrically connected to the power supply output ends of the iron core moving mechanism (6) and the reset mechanism (7), respectively.

2. The invasive casting auxiliary device according to claim 1 is characterized in that: A mounting groove and two slide grooves are provided in the frame wall at the top of the main frame (1); the driving ends of the iron core moving mechanism (6) and the iron armor forming transmission mechanism (5) are both located in the mounting groove, and the mounting groove is connected to the two slide grooves.

3. The invasive casting auxiliary device according to claim 1 is characterized in that: The iron clothing placement mechanism (3) comprises a support block (301), a placement plate (302), a limit plate (303) and a flip plate (304); the support block (301) is located in a groove in the main frame (1) and is fixedly connected, and the support block (301) is fixedly connected to the placement plate (302); rotating grooves are respectively provided on the two side wall surfaces of the placement plate (302), and a flip plate (304) is rotatably connected in the rotating groove; the flip plate (304) is connected to the moving end of the iron clothing forming transmission mechanism (5); the two sides of the upper surface of the placement plate (302) are respectively fixedly connected to the limit plates (303), and a clamping groove is provided in the middle position of one of the limit plates (303).

4. The invasive casting auxiliary device according to claim 3 is characterized in that: Two transmission grooves are provided on a side of the flip plate (304) away from the support block (301), and a fixed rod is fixedly connected in the transmission groove. A rotating ring is rotatably connected to the fixed rod, and the rotating ring is connected to the moving end of the iron clothing forming transmission mechanism (5).

5. The invasive casting auxiliary device according to claim 1 is characterized in that: The iron core moving mechanism (6) comprises a third screw rod (601), a servo motor (602), a second bevel gear (603), a third bevel gear (604), a fixing plate (605) and a fourth bevel gear (606), wherein the number of the third screw rods (601) is two, the two third screw rods (601) are both located on the main frame (1) and are threadedly connected, and the bottom end of the third screw rod (601) is rotatably connected to the iron core clamping mechanism (4), the third screw rod (601) is threadedly connected to the third bevel gear (604), and the third bevel gear (604) is located in a mounting groove on the main frame (1) and is rotatably connected, The servo motor (602) is located in a mounting groove on the main frame (1) and is fixedly connected, and the servo motor (602) is connected to the second bevel gear (603) via a motor shaft, and the second bevel gear (603) is meshingly connected to the third bevel gear (604), and the fixed plate (605) is located in a mounting groove on the main frame (1) and is fixedly connected, and a connecting rod is rotatably connected to the fixing plate (605), and both ends of the connecting rod are respectively fixedly connected to fourth bevel gears (606), and the two fourth bevel gears (606) are respectively meshingly connected to the third bevel gear (604) and the driving end of the iron clothing forming transmission mechanism (5).

6. The invasive casting auxiliary device according to claim 1 is characterized in that: The iron clothing forming transmission mechanism (5) comprises a first screw rod (501), a second screw rod (502), an internally threaded sleeve (503), a first bevel gear (504) and a moving block (506). The number of the first screw rods (501) is two. The two first screw rods (501) are both located in a mounting groove on the main frame (1) and are rotatably connected. A first bevel gear (504) is fixedly connected to the middle position of the first screw rod (501). The first bevel gear (504) is meshingly connected to one of the fourth bevel gears (606). Two moving blocks (506) are threadedly connected to the first screw rod (501), and the two moving blocks (506) are respectively located on both sides of the first bevel gear (504). The moving block (506) is rotatably connected to the internally threaded sleeve (503), and the internally threaded sleeve (503) is internally threadedly connected to the second screw rod (502). The bottom end of the second screw rod (502) is connected to a rotating ring.

7. The invasive casting auxiliary device according to claim 6 is characterized in that: A gear ring (505) is fixedly connected to the outer wall of the internally threaded sleeve (503), and the gear ring (505) is meshingly connected to a rack (507), and the rack (507) is located in a sliding groove on the main frame (1) and is fixedly connected.

8. The invasive casting auxiliary device according to claim 6 is characterized in that: The threads of the first screw rod (501) located on both sides of the first bevel gear (504) are oriented in opposite directions, controlling the moving blocks (506) on both sides to move inwards or outwards at the same time.

9. The invasive casting auxiliary device according to claim 1, characterized in that: The core clamping mechanism (4) comprises a movable plate (401), a sliding rod (402), a spring (403) and a contact plate (404); the movable plate (401) is located at the bottom end of the third screw rod (601) and is rotatably connected thereto; two through slots are provided on the movable plate (401); the sliding rod (402) is fixedly connected in the through slots; the spring (403) is sleeved on the sliding rod (402); one end of the spring (403) is fixedly connected to a slot wall of the through slot; the other end of the spring (403) is connected to the contact plate (404); the contact plate (404) is located in the through slot and is slidably connected thereto; the position of the movable plate (401) corresponds to the position of the placement plate (302).

10. The invasive casting auxiliary device according to claim 1, characterized in that: The reset mechanism (7) comprises an electric telescopic rod (701), a connecting plate (702) and an internal threaded ring (703); the number of the electric telescopic rods (701) is two groups, and the number of each group of electric telescopic rods (701) is two; the two groups of electric telescopic rods (701) are both located on the inner wall of the top end of the main frame (1) and are fixedly connected; the connecting plate (702) is fixedly connected to the telescopic end of the electric telescopic rod (701); an internal threaded ring (703) is fixedly connected between the two connecting plates (702); and the position of the internal threaded ring (703) corresponds to the position of the third screw rod (601) and is threadedly connected thereto.

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