Swing arm box closing device

Abstract

The utility model provides a swing arm box closing device. The swing arm box closing device comprises a first frame body, a second frame body, a swing arm body, a first telescopic cylinder body, a second telescopic cylinder body and a third telescopic cylinder body, the first frame body and the second frame body are arranged on one side of the swing arm body in a sliding mode. The first telescopic cylinder body is arranged on the first frame body, and the movable end of the first telescopic cylinder body faces the second frame body; the second telescopic cylinder body is arranged on the second frame body, the movable end of the second telescopic cylinder body faces the first frame body, and the movable end of the first telescopic cylinder body is connected with the movable end of the second telescopic cylinder body; the third telescopic cylinder body is arranged at one end of the swing arm body, the movable end of the third telescopic cylinder body faces the second telescopic cylinder body, the movable end of the third telescopic cylinder body is connected with the second telescopic cylinder body, and the movable state of the third telescopic cylinder body is opposite to that of the second telescopic cylinder body. The mold has the advantages that the first frame body and the second frame body can move, so that the use flexibility is better, and the demolding is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of molding machines, and particularly relates to a swing arm mold closing device.

Background Art

[0002] The central link of sand casting is molding, and a molding machine is required during molding. The main functions of the molding machine are: filling sand, filling loose molding sand into the sand box; compacting the molding sand, making the loose molding sand in the sand box compact through different methods such as vibration compaction, pressure compaction, vibration-pressure compaction, and injection compaction, so that the sand mold has the necessary strength during processes such as handling and pouring; demolding, using different mechanisms to take out the pattern from the compacted sand mold.

[0003] In some existing molding machines, in order to produce two sand molds at one time to improve production efficiency, the sand box is usually designed to include an upper mold frame and a lower mold frame, such as an up-down injection sand double-station molding machine disclosed in the Chinese invention patent application with the application number CN202110286324.6. However, the upper mold frame of the above existing sand box is fixed, only the lower mold frame can slide up and down, the demolding is relatively inconvenient, the use flexibility is also poor, and at the same time, an upper injection sand mechanism and a lower injection sand mechanism need to be set, and it is impossible to use one injection sand mechanism to inject sand into the upper and lower mold frames at the same time. In view of the above problems, the inventor of this case has conducted in-depth research on this problem, and thus this case has emerged.

Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a swing arm mold closing device, which solves the problems that the existing sand box has relatively inconvenient demolding, poor use flexibility, and cannot use one injection sand mechanism to inject sand into the upper and lower mold frames at the same time.

[0005] The utility model is realized as follows: a swing arm mold closing device, including a first frame body, a second frame body, a swing arm body, a first telescopic cylinder body, a second telescopic cylinder body, and a third telescopic cylinder body;

[0006] Both the first frame body and the second frame body are slidably arranged on one side of the swing arm body; the first telescopic cylinder body is arranged on the first frame body, and the movable end of the first telescopic cylinder body faces the second frame body; the second telescopic cylinder body is arranged on the second frame body, the movable end of the second telescopic cylinder body faces the first frame body, and the movable end of the first telescopic cylinder body is connected to the movable end of the second telescopic cylinder body; the third telescopic cylinder body is arranged at one end of the swing arm body, the movable end of the third telescopic cylinder body faces the second telescopic cylinder body, the movable end of the third telescopic cylinder body is connected to the second telescopic cylinder body, and the movement states of the third telescopic cylinder body and the second telescopic cylinder body are opposite.

[0007] Further, it further includes a support column and a fourth telescopic cylinder body; the upper end of the swing arm body is hinged to the upper end of the support column, and the third telescopic cylinder body is arranged at the lower end of the swing arm body; the lower end of the fourth telescopic cylinder body is hinged to the lower part of the support column, and the upper end of the fourth telescopic cylinder body is hinged to the middle part of the swing arm body.

[0008] Further, the active strokes of the first telescopic cylinder body and the second telescopic cylinder body are equal, and the active stroke of the third telescopic cylinder body is greater than that of the second telescopic cylinder body.

[0009] Further, the tops and bottoms of the first frame body and the second frame body are both open, and sand shooting openings are arranged on one side of the first frame body and the second frame body facing away from the swing arm body.

[0010] Further, frame guide columns are arranged vertically on both sides of the swing arm body on the side facing away from the support column, guide bushings are arranged on both sides of the first frame body and the second frame body on the side facing the swing arm body, a cylinder body assembly space is formed between the two guide bushings, and the guide bushings are slidably sleeved on the frame guide columns.

[0011] Further, the swing arm body includes a swing arm main board and swing arm side boards; the swing arm side boards are arranged on both sides of the swing arm main board on the side facing away from the first frame body and the second frame body, and reinforcing plates are arranged in a criss-cross manner between the two swing arm side boards.

[0012] Further, avoidance openings are arranged through the middle part of the swing arm main board at positions corresponding to the first telescopic cylinder body and the second telescopic cylinder body.

[0013] Further, hinge seats for connecting with the support column are arranged on the outer sides of the upper ends of each swing arm side board, and the upper ends of each swing arm side board are rotatably connected to the hinge seats through a first hinge shaft; second hinge shafts are fixedly arranged on the outer sides of the middle parts of each swing arm side board, and the upper end of the fourth telescopic cylinder body is rotatably connected to the second hinge shaft.

[0014] Further, a vibrator is arranged on the outer wall of the first frame body or the second frame body.

[0015] Further, the first telescopic cylinder body, the second telescopic cylinder body, the third telescopic cylinder body, and the fourth telescopic cylinder body all adopt telescopic oil cylinders.

[0016] By adopting the technical solution of the present utility model, there are at least the following beneficial effects:

[0017] 1. By designing the swing arm mold closing device with a first telescopic cylinder body, a second telescopic cylinder body, and a third telescopic cylinder body, setting the first telescopic cylinder body on the first frame body, setting the second telescopic cylinder body on the second frame body, and directly connecting the movable ends of the first telescopic cylinder body and the second telescopic cylinder body in series, during operation, the first telescopic cylinder body and the second telescopic cylinder body can cooperate to drive the first frame body and the second frame body to perform mold closing and mold opening actions; at the same time, during the process of the second telescopic cylinder body driving the second frame body to perform mold closing and opening, the third telescopic cylinder body can move in the opposite direction following the telescopic movement of the second telescopic cylinder body, thereby ensuring that the first frame body and the second frame body can reliably perform mold closing and mold opening. And when it is necessary to demold the first frame body and the second frame body, the first telescopic cylinder body and the second telescopic cylinder body can be kept stationary, and the third telescopic cylinder body can be used to drive the first frame body and the second frame body to perform synchronous lifting and lowering movements to achieve demolding; because both the first frame body and the second frame body in the present utility model can move, therefore, the use flexibility is better and the demolding is more convenient.

[0018] 2. By designing the swing arm mold closing device including a swing arm body, a support column, and a fourth telescopic cylinder body, hinging the upper end of the swing arm body with the support column, hinging the upper end of the fourth telescopic cylinder body with the middle part of the swing arm body, and hinging the lower end of the fourth telescopic cylinder body with the lower part of the support column. At the same time, it is designed that both the top and bottom of the first frame body and the second frame body are open, and the first frame body and the second frame body have sand shooting openings on the side facing away from the swing arm body; during specific operation, when the first frame body and the second frame body are closed to form a sand box, the fourth telescopic cylinder body can be used to drive the swing arm body and the sand box to be flipped 90° upward from the vertical state to the horizontal state. At this time, the sand shooting openings of the first frame body and the second frame body both face upward, which is convenient to use a sand shooting mechanism to simultaneously perform vertical sand shooting on the first frame body and the second frame body. The operation is more convenient, which also helps to reduce the complexity of the equipment. At the same time, it is also convenient to compact the filled molding sand from both sides of the sand box to ensure the forming effect of the sand mold; when the sand mold is formed, the fourth telescopic cylinder body can be used to drive the swing arm body and the sand box to be flipped 90° downward from the horizontal state to the vertical state, thereby facilitating the demolding operation.

Description of the Drawings

[0019] The following further describes the present utility model with reference to the drawings in conjunction with embodiments.

[0020] Figure 1 is the overall assembled three-dimensional view of the swing arm mold closing device of the present utility model;

[0021] Figure 2 is the front three-dimensional structure diagram of the swing arm mold closing device of the present utility model when the first frame body and the second frame body are in the mold opening state;

[0022] Figure 3It is the rear three-dimensional structure diagram of the swing-arm mold-closing device of the present utility model when the first frame body and the second frame body are in the mold-opening state;

[0023] Figure 4 It is the front three-dimensional structure diagram of the swing-arm mold-closing device of the present utility model when the first frame body and the second frame body are in the mold-closing state;

[0024] Figure 5 It is the rear three-dimensional structure diagram of the swing-arm mold-closing device of the present utility model when the first frame body and the second frame body are in the mold-closing state;

[0025] Figure 6 It is the three-dimensional structure diagram of the swing-arm mold-closing device of the present utility model after the first frame body and the second frame body are in the mold-closing state and are turned upward by 90°;

[0026] Figure 7 It is the structure diagram of the swing-arm body of the present utility model.

[0027] Explanation of reference numerals:

[0028] Swing-arm mold-closing device 100;

[0029] First frame body 1, sand injection opening 1a, vibrator 1b;

[0030] Second frame body 2;

[0031] Swing-arm body 3, swing-arm main board 31, avoidance opening 311, guide post support seat 312, swing-arm side board 32, reinforcement plate 33, hinge seat 34, first hinge shaft 35, second hinge shaft 36;

[0032] First telescopic cylinder body 4;

[0033] Second telescopic cylinder body 5;

[0034] Third telescopic cylinder body 6;

[0035] Support column 7;

[0036] Fourth telescopic cylinder body 8;

[0037] Frame guide post 9;

[0038] Guide post sleeve 10, cylinder body assembly space 101.

Detailed implementation manners

[0039] In order to better understand the technical solution of the present utility model, the technical solution of the present utility model will be described in detail below in conjunction with the specification drawings and specific implementation manners.

[0040] It should be noted here that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing these embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features.

[0041] Please refer to Figures 1 to 7 As shown, a swing arm mold closing device 100 of the present utility model, the swing arm mold closing device 100 includes a first frame 1, a second frame 2, a swing arm body 3, a first telescopic cylinder 4, a second telescopic cylinder 5, and a third telescopic cylinder 6;

[0042] Both the first frame 1 and the second frame 2 are slidably arranged on one side of the swing arm body 3, so that the first frame 1 and the second frame 2 can slide relative to the swing arm body 3; the first telescopic cylinder 4 is arranged on the first frame 1 to drive the first frame 1 to move by using the first telescopic cylinder 4, and the movable end of the first telescopic cylinder 4 faces the second frame 2; the second telescopic cylinder 5 is arranged on the second frame 2 to drive the second frame 2 to move by using the second telescopic cylinder 5, the movable end of the second telescopic cylinder 5 faces the first frame 1, and the movable end of the first telescopic cylinder 4 is connected to the movable end of the second telescopic cylinder 5, that is, the first telescopic cylinder 4 and the second telescopic cylinder 5 are connected in series; the third telescopic cylinder 6 is arranged at one end of the swing arm body 3, the movable end of the third telescopic cylinder 6 faces the second telescopic cylinder 5, the movable end of the third telescopic cylinder 6 is connected to the second telescopic cylinder 5, and the operating states of the third telescopic cylinder 6 and the second telescopic cylinder 5 are opposite, that is, when the movable end of the second telescopic cylinder 5 extends forward, the movable end of the third telescopic cylinder 6 will retract backward, and when the movable end of the second telescopic cylinder 5 retracts backward, the movable end of the third telescopic cylinder 6 will extend forward.

[0043] The utility model designs a swing-arm mold-closing device 100 with a first telescopic cylinder body 4, a second telescopic cylinder body 5 and a third telescopic cylinder body 6. The first telescopic cylinder body 4 is arranged on a first frame body 1, the second telescopic cylinder body 5 is arranged on a second frame body 2, and the movable ends of the first telescopic cylinder body 4 and the second telescopic cylinder body 5 are directly connected in series. When working, the first telescopic cylinder body 4 and the second telescopic cylinder body 5 can cooperate to drive the first frame body 1 and the second frame body 2 to perform mold-closing and mold-opening actions. At the same time, during the process of the second telescopic cylinder body 5 driving the second frame body 2 to perform mold-closing and mold-opening, the third telescopic cylinder body 6 can move in the opposite direction following the telescopic movement of the second telescopic cylinder body 5, so as to ensure that the first frame body 1 and the second frame body 2 can reliably perform mold-closing and mold-opening. And when it is necessary to demold the first frame body 1 and the second frame body 2, the first telescopic cylinder body 4 and the second telescopic cylinder body 5 can be kept stationary, and the third telescopic cylinder body 6 can be used to drive the first frame body 1 and the second frame body 2 to perform lifting movement synchronously to realize demolding. Since both the first frame body 1 and the second frame body 2 in the utility model can move, the use flexibility is better and the demolding is more convenient.

[0044] In some embodiments of the utility model, the swing-arm mold-closing device 100 further includes a support column 7 and a fourth telescopic cylinder body 8. The upper end of the swing-arm body 3 is hinged to the upper end of the support column 7, and the third telescopic cylinder body 6 is arranged at the lower end of the swing-arm body 3. When it is necessary to demold the sand mold in the first frame body 1 and the second frame body 2, after the first frame body 1 and the second frame body 2 are mold-closed, the third telescopic cylinder body 6 can be used to drive the first frame body 1 and the second frame body 2 to rise synchronously and block the sand mold from the top of the first frame body 1, so that the sand mold does not rise together with the first frame body 1 and the second frame body 2 to realize demolding. The lower end of the fourth telescopic cylinder body 8 is hinged to the lower part of the support column 7, and the upper end of the fourth telescopic cylinder body 8 is hinged to the middle part of the swing-arm body 3. During work, the fourth telescopic cylinder body 8 can be used to drive the swing-arm body 3 to rotate 90° upward from the vertical state to the horizontal state, or the fourth telescopic cylinder body 8 can be used to drive the swing-arm body 3 to rotate 90° downward from the horizontal state to the vertical state.

[0045] More specifically, the tops and bottoms of the first frame body 1 and the second frame body 2 are both open to facilitate compacting the molding sand filled into the first frame body 1 and the second frame body 2. Sand injection openings 1a are arranged on one side of the first frame body 1 and the second frame body 2 facing away from the swing-arm body 3 to inject sand into the first frame body 1 and the second frame body 2 by using the sand injection openings 1a.

[0046] The utility model designs a swing arm mold closing device 100, which includes a swing arm body 3, a support column 7 and a fourth telescopic cylinder 8. The upper end of the swing arm body 3 is hinged to the support column 7, the upper end of the fourth telescopic cylinder 8 is hinged to the middle part of the swing arm body 3, and the lower end of the fourth telescopic cylinder 8 is hinged to the lower part of the support column 7. At the same time, it is designed that the tops and bottoms of the first frame 1 and the second frame 2 are both open, and the first frame 1 and the second frame 2 have sand shooting openings 1a on the side facing away from the swing arm body 3. When the first frame 1 and the second frame 2 are closed to form a sand box during specific operation, the fourth telescopic cylinder 8 can drive the swing arm body 3 and the sand box to be turned upwards by 90° from the vertical state to the horizontal state. At this time, the sand shooting openings 1a of the first frame 1 and the second frame 2 both face upwards, which is convenient to use a sand shooting mechanism to simultaneously perform vertical sand shooting on the first frame 1 and the second frame 2. The operation is more convenient, which helps to reduce the complexity of the equipment. At the same time, it is also convenient to compact the filled molding sand from both sides of the sand box to ensure the forming effect of the sand mold. When the sand mold is formed, the fourth telescopic cylinder 8 can drive the swing arm body 3 and the sand box to be turned downwards by 90° from the horizontal state to the vertical state, so as to facilitate the demolding operation.

[0047] As a specific embodiment of the utility model, the moving strokes of the first telescopic cylinder 4 and the second telescopic cylinder 5 are equal, so that the first telescopic cylinder 4 and the second telescopic cylinder 5 can drive the first frame 1 and the second frame 2 to perform opening and closing mold operations more stably; the moving stroke of the third telescopic cylinder 6 is greater than that of the second telescopic cylinder 5, ensuring that in addition to following the second telescopic cylinder 5 to move together, the third telescopic cylinder 6 can also drive the first frame 1 and the second frame 2 to perform lifting during demolding.

[0048] In some embodiments of the utility model, in order to ensure the stability of the movement of the first frame 1 and the second frame 2, frame guide columns 9 are arranged vertically on both sides of the swing arm body 3 on the side facing away from the support column 7, and guide bushings 10 are arranged on both sides of the first frame 1 and the second frame 2 on the side facing the swing arm body 3. A cylinder assembly space 101 is formed between the two guide bushings 10, and the cylinder assembly space 101 is used to install the first telescopic cylinder 4 and the second telescopic cylinder 5. The guide bushings 10 are slidably sleeved on the frame guide columns 9.

[0049] In some embodiments of the utility model, the swing arm body 3 includes a swing arm main board 31 and swing arm side boards 32; the swing arm side boards 32 are arranged on both sides of the swing arm main board 31 on the side facing away from the first frame 1 and the second frame 2, and reinforcing plates 33 are arranged in a criss-cross manner between the two swing arm side boards 32 to ensure the strength of the entire swing arm body 3.

[0050] More specifically, an avoidance opening 311 is provided through the middle of the swing arm main board 31 at positions corresponding to the first telescopic cylinder body 4 and the second telescopic cylinder body 5. This can not only avoid the first telescopic cylinder body 4 and the second telescopic cylinder body 5, ensuring that the swing arm main board 31 does not affect the operation of the first telescopic cylinder body 4 and the second telescopic cylinder body 5, but also facilitate operations such as installation, inspection, and maintenance of the first telescopic cylinder body 4 and the second telescopic cylinder body 5 using this avoidance opening 311.

[0051] More specifically, a hinge seat 34 for connecting to the support column 7 is provided on the outer side of the upper end of each swing arm side plate 32. Specifically, the hinge seat 34 is fixed on the support column 7, and the upper end of each swing arm side plate 32 is rotatably connected to the hinge seat 34 through a first hinge shaft 35, enabling the entire swing arm body 3 to rotate up and down relative to the support column 7; a second hinge shaft 36 is fixedly provided on the outer side of the middle of each swing arm side plate 32, and the upper end of the fourth telescopic cylinder body 8 is rotatably connected to the second hinge shaft 36, enabling the fourth telescopic cylinder body 8 to drive the swing arm body 3 to rotate and swing.

[0052] More specifically, a guide post support seat 312 is provided on the surface of the swing arm main board 31 facing the frame guide post 9, and the end of the frame guide post 9 is connected to the guide post support seat 312.

[0053] In some embodiments of the present invention, a vibrator 1b is provided on the outer wall of the first frame 1 or the second frame 2. During operation, the vibrator 1b can be used to generate a vibration effect on the first frame 1 or the second frame 2, thereby realizing the compaction of the molding sand in the first frame 1 and the second frame 2.

[0054] As a specific implementation manner of the present invention, the first telescopic cylinder body 4, the second telescopic cylinder body 5, the third telescopic cylinder body 6, and the fourth telescopic cylinder body 8 all adopt telescopic oil cylinders.

[0055] The specific working principle of the swing arm mold closing device 100 is as follows: When it is necessary to close the mold of the first frame 1 and the second frame 2, control the movable ends of the first telescopic cylinder body 4 and the second telescopic cylinder body 5 to retract inward, and at the same time control the movable end of the third telescopic cylinder body 6 to extend outward, so that the first frame 1 and the second frame 2 approach each other to close the mold, as shown in Figure 4 and Figure 5 shown; when it is necessary to open the mold of the first frame 1 and the second frame 2, control the movable ends of the first telescopic cylinder body 4 and the second telescopic cylinder body 5 to extend outward, and at the same time control the movable end of the third telescopic cylinder body 6 to retract inward, so that the first frame 1 and the second frame 2 move away from each other to open the mold, as shown in Figure 2 and Figure 3As shown; when demolding the sand mold in the first frame body 1 and the second frame body 2 is required, control the first frame body 1 and the second frame body 2 to first perform mold closing. And after the mold closing is completed, control the movable ends of the first telescopic cylinder body 4 and the second telescopic cylinder body 5 to remain stationary, and block the sand mold from the top of the first frame body 1. At the same time, control the third telescopic cylinder body 6 to drive the first frame body 1 and the second frame body 2 to rise together to achieve demolding. After the demolding is completed, control the third telescopic cylinder body 6 to drive the first frame body 1 and the second frame body 2 to descend and return to their original positions. When sand injection into the sand box after mold closing is required, the fourth telescopic cylinder body 8 can be used to drive the swing arm body 3 and the sand box to rotate 90° upward from the vertical state to the horizontal state. At this time, the sand injection openings 1a of the first frame body 1 and the second frame body 2 both face upward, thus facilitating vertical sand injection, as Figure 6 shown; and after the sand mold is formed, the fourth telescopic cylinder body 8 can be used to drive the swing arm body 3 and the sand box to rotate 90° downward from the horizontal state to the vertical state, so as to facilitate the demolding operation.

[0056] Although the specific implementation manners of the present invention are described above, those skilled in the art of this technology should understand that the specific embodiments we described are illustrative rather than used to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope protected by the claims of the present invention.

Claims

1. A swing arm closing device, comprising a first frame and a second frame; characterized in that: It also includes a swing arm body, a first telescopic cylinder body, a second telescopic cylinder body and a third telescopic cylinder body; The first frame and the second frame are both slidably arranged on one side of the swing arm body; the first telescopic cylinder is arranged on the first frame, and the movable end of the first telescopic cylinder faces the second frame; the second telescopic cylinder is arranged on the second frame, and the movable end of the second telescopic cylinder faces the first frame, and the movable end of the first telescopic cylinder is connected to the movable end of the second telescopic cylinder; the third telescopic cylinder is arranged at one end of the swing arm body, and the movable end of the third telescopic cylinder faces the second telescopic cylinder, and the movable end of the third telescopic cylinder is connected to the second telescopic cylinder, and the movable state of the third telescopic cylinder is opposite to that of the second telescopic cylinder.

2. A swing arm closing device as claimed in claim 1, characterized in that: It also includes a supporting column and a fourth telescopic cylinder; the upper end of the swing arm body is hinged to the upper end of the supporting column, and the third telescopic cylinder is arranged at the lower end of the swing arm body; the lower end of the fourth telescopic cylinder is hinged to the lower part of the supporting column, and the upper end of the fourth telescopic cylinder is hinged to the middle part of the swing arm body.

3. A swing arm box closing device as claimed in claim 1, characterized in that: The first telescopic cylinder body has the same movable stroke as the second telescopic cylinder body, and the third telescopic cylinder body has a movable stroke greater than the movable stroke of the second telescopic cylinder body.

4. A swing arm box closing device as claimed in claim 1, characterized in that: The tops and bottoms of the first frame and the second frame are both open, and the first frame and the second frame are both provided with sand-shooting openings on a side facing away from the swing arm body.

5. A swing arm box closing device as claimed in claim 2, characterized in that: The swing arm body is provided with frame guide columns along the vertical direction on both sides of the side facing away from the supporting column, and the first frame and the second frame are provided with guide column sleeves on both sides of the side facing the swing arm body, and a cylinder assembly space is formed between the guide column sleeves on both sides, and the guide column sleeve sliding sleeve is provided on the frame guide column.

6. A swing arm closing device as claimed in claim 2, characterized in that: The swing arm body includes a swing arm main board and a swing arm side board; the swing arm side boards are arranged on both sides of the swing arm main board facing away from the first frame body and the second frame body, and a reinforcing board crisscrossed between the two swing arm side boards.

7. A swing arm box closing device as claimed in claim 6, characterized in that: An avoidance opening is provided through the middle of the swing arm main plate at positions corresponding to the first telescopic cylinder body and the second telescopic cylinder body.

8. A swing arm box closing device as claimed in claim 6, characterized in that: A hinge seat for connecting to a supporting column is arranged on the outer side of the upper end of each swing arm side plate, and the upper end of each swing arm side plate is rotatably connected to the hinge seat via a first hinge shaft; a second hinge shaft is fixedly arranged on the outer side of the middle part of each swing arm side plate, and the upper end of the fourth telescopic cylinder body is rotatably connected to the second hinge shaft.

9. A swing arm box closing device according to any one of claims 1 to 8, characterized in that: A vibrator is disposed on the outer wall of the first frame body or the second frame body.

10. A swing arm box closing device as claimed in claim 2, characterized in that: The first telescopic cylinder body, the second telescopic cylinder body, the third telescopic cylinder body and the fourth telescopic cylinder body all adopt telescopic oil cylinders.

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