Molten metal drainage structure for casting large castings

Abstract

The invention discloses a molten metal drainage structure for casting a large casting, and relates to the technical field related to casting. The device comprises a supporting shell, a heat preservation block, installation assemblies, an output cavity and a sealing plate, the heat preservation block is fixed to one end of the supporting shell, an input pipe is fixed in an outer heat preservation sleeve, and the top end of the input pipe extends out of the top end of the outer heat preservation sleeve; an output cavity is fixed to the end, away from the supporting shell, of the heat preservation pipe, a sealing plate is fixed to the top of the output cavity, the bottom end of the output cavity fixedly communicates with an output shell, an output block is fixed to the bottom of the output shell, and a mounting frame is fixed to one side of the output block. By arranging the supporting shell, the heat preservation block, the mounting assembly, the output cavity and the sealing plate, the problems that in the molten metal drainage process, surface impurities need to be continuously cleaned manually, operation is inconvenient, the applicability to different casting positions is not good enough, and the casting effect is affected due to the fact that the molten metal makes contact with much air in the drainage process are solved.

Description

Technical Field

[0001] The invention belongs to the technical field related to casting, and in particular relates to a molten metal drainage structure for casting large castings. Background Art

[0002] Large casting casting is a process of injecting molten metal into a mold of a specific shape, and forming large metal parts with predetermined shapes, sizes and properties after cooling and solidification. This process is widely used in mechanical manufacturing, aerospace, energy and other fields because it can produce large and complex parts at a relatively low cost. The production of large castings involves a complex process, including metal melting, liquid metal drainage, model making, pouring solidification and demolding and cleaning. Metal drainage refers to the process of transferring liquid metal from one container to another container or system during metal smelting, casting or other related industrial processes. This process requires special attention because liquid metal is hot and potentially dangerous, which may cause safety accidents such as burns, fire or explosion, but it still has the following disadvantages in actual use: In the process of draining the molten metal, the molten metal is directly guided. During the process of draining the molten metal, oxide scale will be generated on the molten metal. In addition, due to the high density of the molten metal, the residue in the molten metal will cause the drainage structure to be blocked, which requires continuous cleaning, resulting in low work efficiency and inconvenient operation. During the process of molten metal drainage, there is a tendency for different position deviations between the output position of the molten metal output device and the input position of the casting device. The drainage structure can only be drained by adding a drainage structure, which is not suitable for different casting positions. During the process of molten metal drainage, the molten metal is directly output to the casting equipment through the guide nozzle. After the molten metal is guided, the guide nozzle for guiding the molten metal needs to be reset to an upward position. However, at this time, the surface of the molten metal will contact the air, causing rapid oxidation of the molten metal, affecting the casting effect of the casting. Summary of the invention

[0003] The purpose of the present invention is to provide a molten metal drainage structure for large castings. By arranging a support shell, an insulation block, a mounting assembly, an output cavity and a sealing plate, the present invention solves the problems that surface impurities need to be constantly cleaned manually during the molten metal drainage process, which is inconvenient to operate, the applicability to different casting positions is not good enough, and the molten metal drainage contacts more air, affecting the casting effect.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention discloses a molten metal drainage structure for large castings, comprising a support shell, an insulation block, a mounting assembly, an output cavity and a sealing plate, wherein an insulation block is fixed at one end of the support shell, an outer insulation sleeve is fixed at the top of the insulation block, an input pipe is fixed inside the outer insulation sleeve, the top of the input pipe extends out of the top of the outer insulation sleeve, a connecting ring is fixed at the peripheral side of the input pipe above the outer insulation sleeve, a ring sleeve is movably connected at the peripheral side of the connecting ring, the bottom of the insulation block and the edge of the bottom of the support shell away from the insulation block are both fixed with mounting assemblies, an end of the support shell away from the insulation block is fixedly connected with an insulation pipe, an end of the insulation pipe away from the support shell is fixed with an output cavity, and the output cavity A sealing plate is fixed to the top, four connecting rods are fixed to the bottom of the sealing plate, a fixing frame is commonly fixed to the bottom ends of all the connecting rods, a screen plate is fixed in the fixing frame, the fixing frame is movably connected in the output cavity, the bottom end of the output cavity is fixedly connected to an output shell, an output block is fixed to the bottom of the output shell, and a mounting frame is fixed to one side of the output block. When working, the inner tube is fixed in it by the supporting shell, the molten metal entering the conveying cavity is insulated and conveyed by the insulation block, the supporting shell and the insulation block are supported on the supporting surface by the installation assembly, the molten metal conveyed in the inner tube is conveyed to the output block through the output cavity, and the top of the output cavity is closed by the sealing plate.

[0005] Furthermore, an inner tube is fixed through the support shell along the length direction, a filling layer is fixed between the inner tube and the inner wall of the support shell, one end of the inner tube close to the insulation block is fixedly connected to the conveying cavity, and one end of the inner tube away from the insulation block is fixedly connected to the insulation tube, the support shell transports the molten metal to the insulation tube through the inner tube, the gap between the support shell and the inner tube is closed by the filling layer, and the molten metal passing through the inner tube is insulated.

[0006] Furthermore, the bottom end of the input pipe is fixed on the top of the insulation block and communicates with the upper part of the peripheral side of the conveying cavity. A feed pipe is fixed on the top of the ring sleeve. The inner diameter of the feed pipe is equal to the inner diameter of the input pipe. The input pipe conveys the molten metal to the input pipe through the feed pipe.

[0007] Furthermore, the installation assembly includes a fixed plate, a rotating column and a mounting plate. The bottom end of the fixed plate is rotatably connected to the rotating column, and the bottom end of the rotating column is fixed with the mounting plate. The installation assembly is connected to the mounting plate through the rotating column, and the mounting plate provides installation cooperation for the mounting bolts.

[0008] Furthermore, a fixing opening is provided at the center of one side of the output cavity close to the supporting shell, the fixing opening is communicated with the heat preservation pipe, and the output cavity is communicated with the heat preservation pipe through the fixing opening.

[0009] Furthermore, a pulling handle is fixed at the top center of the sealing plate, and fastening bolts are inserted through the four corners of the sealing plate. The fastening bolts are threadedly connected to the top of the output cavity, and the sealing plate provides a pulling action through the pulling handle.

[0010] Furthermore, a through-hole is vertically opened in the output block, the through-hole is connected to the output shell, a discharge pipe is fixed at the bottom of the output block, the through-hole corresponds to the position of the discharge pipe, and the inner diameter of the through-hole is equal to the inner diameter of the discharge pipe, and the output block transports the molten metal to the discharge pipe through the through-hole.

[0011] Furthermore, an electric push rod is fixed on the inner wall of the installation frame, a baffle is fixed to the telescopic end of the electric push rod, a gate is fixed on the side of the baffle away from the electric push rod, and the installation frame drives the baffle through the electric push rod to drive the gate to move.

[0012] Furthermore, a socket is provided in the middle of one side of the output block close to the mounting frame, the socket is communicated with the through-hole, the gate is plugged into the socket, and the output block is movably connected to the gate through the socket, so that the gate closes the through-hole.

[0013] The present invention has the following beneficial effects: The present invention solves the problem of the inconvenience of manual cleaning of surface impurities during the drainage of molten metal by providing an output chamber and a sealing plate. The molten metal conveying equipment conveys the molten metal to the feed pipe, conveys it to the input pipe through the feed pipe, conveys it to the conveying chamber through the input pipe, conveys it to the inner tube in the support shell through the conveying chamber, conveys it to the insulation tube through the inner tube, and then conveys it to the output chamber through the insulation tube, wherein normal molten metal is screened out through the sieve plate in the fixed frame in the output chamber and conveyed to the output block, and the oxide scale, residue, etc. in the molten metal remain on the sieve plate, so that the surface impurities do not need to be manually cleaned continuously during the drainage of the molten metal, and the operation is more convenient.

[0014] The present invention solves the problem of poor applicability to different casting positions during the process of molten metal drainage by providing a support shell, an insulation block and a mounting assembly. When working, the corresponding position where the output cavity is placed is determined, the support shell is rotated so that the output cavity is rotated to a specified position, and then the two mounting disks are rotated respectively. After the holes are aligned, the mounting bolts are inserted into the mounting disks and then screwed into the mounting position. When working, the support shell and the insulation block are installed in appropriate positions, which improves the applicability to different casting positions during the process of molten metal drainage.

[0015] The present invention solves the problem that the molten metal contacts with more air during drainage and affects the casting effect by providing an output block and a mounting frame. After the molten metal enters the output cavity, it is transported to the output shell, and then transported to the through-hole on the output block through the output shell, and then transported to the discharge pipe through the through-hole, and then discharged into the casting cavity through the discharge pipe. When the casting is completed, the electric push rod is started, and the electric push rod pushes the baffle to drive the gate plate to move until the gate plate is fully inserted into the socket to close the through-hole, so that the molten metal in the through-hole is blocked during work. When the molten metal needs to be transported, the electric push rod is started, and the electric push rod drives the baffle to drive the gate plate to move away from the through-hole, so that the molten metal enters the discharge pipe through the through-hole and is discharged through the discharge pipe. During work, the molten metal can be drained in a closed manner. During the drainage process, the oxidation of the molten metal in the drainage is well reduced, thereby ensuring the casting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 A three-dimensional diagram of the assembly structure of a molten metal drainage structure for a large casting; Figure 2 It is a three-dimensional diagram of the cross-sectional structure of the support shell; Figure 3 It is a partial cross-sectional structural stereogram of the insulation block; Figure 4 A three-dimensional diagram of the installation component structure; Figure 5 It is a three-dimensional diagram of the output cavity structure; Figure 6 It is a three-dimensional diagram of the sealing plate structure; Figure 7 Output block structure stereogram; Figure 8 This is a three-dimensional diagram of the installation frame structure.

[0018] Reference numerals: 1. Support shell; 101. Inner tube; 102. Filling layer; 103. Insulation tube; 2. Insulation block; 201. Conveying cavity; 202. Input tube; 203. Outer insulation sleeve; 204. Connecting ring; 205. Ring sleeve; 206. Feed tube; 3. Mounting assembly; 301. Fixed plate; 302. Rotating column; 303. Mounting plate; 4. Output cavity; 401. Fixed port; 402. Output shell; 5. Sealing plate; 501. Pull handle; 502. Fastening bolt; 503. Connecting rod; 504. Fixed frame; 505. Screen plate; 6. Output block; 601. Through port; 602. Socket; 603. Discharge tube; 7. Mounting frame; 701. Electric push rod; 702. Baffle; 703. Gate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Specific embodiment 1

[0020] See also Figure 1-8The present invention is a molten metal drainage structure for large castings, comprising a support shell 1, an insulation block 2, a mounting assembly 3, an output cavity 4 and a sealing plate 5. The insulation block 2 is fixed at one end of the support shell 1. When the support shell 1 is working, the inner tube 101 is fixed therein, and the molten metal is transported to the inner tube 101 through the input pipe 202 through the insulation block 2. An outer insulation sleeve 203 is fixed on the top of the insulation block 2. The insulation block 2 insulates the input pipe 202 through the outer insulation sleeve 203. The input pipe 202 is fixed inside the outer insulation sleeve 203, and the top of the input pipe 202 extends out of the outer insulation sleeve The top of 203, the molten metal transported in the feed pipe 206 is transported to the transport cavity 201 through the input pipe 202, a connecting ring 204 is fixed on the peripheral side of the input pipe 202 above the outer insulation sleeve 203, and a ring sleeve 205 is movably connected to the peripheral side of the connecting ring 204, and the ring sleeve 205 is movably connected and restricted to the input pipe 202 through the connecting ring 204, and the bottom of the insulation block 2 and the edge of the bottom of the support shell 1 away from the insulation block 2 are fixed with a mounting assembly 3, and the support shell 1 and the insulation block 2 are supported at a suitable position of the external support structure through the mounting assembly 3, and the support shell 1 is away from the insulation block 2 is fixedly connected with an insulation pipe 103, through which the molten metal transported in the inner tube 101 is transported to the output cavity 4, and the end of the insulation pipe 103 away from the support shell 1 is fixed with the output cavity 4, through which the molten metal is transported to the output block 6, and a sealing plate 5 is fixed on the top of the output cavity 4, through which the top of the output cavity 4 is closed, and four connecting rods 503 are fixed on the bottom of the sealing plate 5, and the sealing plate 5 is connected to the fixing frame 504 through the connecting rods 503, and the bottom ends of all the connecting rods 503 are fixed with the fixing frame 504, and the fixing frame 504 is fixed to the bottom ends of the fixing rods 503. The sieve plate 505 is fixed therein, the sieve plate 505 is fixed in the fixed frame 504, the fixed frame 504 is movably connected in the output chamber 4, the molten metal slag in the output chamber 4 is screened through the sieve plate 505, the bottom end of the output chamber 4 is fixedly connected with the output shell 402, the molten metal in the output chamber 4 is transferred to the output block 6 through the output shell 402, the output block 6 is fixed at the bottom of the output shell 402, the molten metal is transferred and output to the discharge pipe 603 through the output block 6, and a mounting frame 7 is fixed on one side of the output block 6, and the electric push rod 701 is fixed therein through the mounting frame 7.

[0021] Specifically, an inner tube 101 is fixed through the support shell 1 along the length direction, and a filling layer 102 is fixed between the inner tube 101 and the inner wall of the support shell 1. The end of the inner tube 101 close to the insulation block 2 is fixedly connected to the conveying cavity 201, and the end of the inner tube 101 away from the insulation block 2 is fixedly connected to the insulation pipe 103. When the support shell 1 is working, the filling layer 102 further increases the insulation effect of the molten metal conveyed by the inner tube 101, and the molten metal conveyed by the conveying cavity 201 is conveyed to the insulation pipe 103 through the inner tube 101.

[0022] Furthermore, the bottom end of the input pipe 202 is fixed on the top of the insulation block 2 and communicated with the upper part of the peripheral side of the conveying cavity 201. A feed pipe 206 is fixed on the top of the ring sleeve 205. The top of the feed pipe 206 is communicated with the output end of the metal liquid conveying equipment. The inner diameter of the feed pipe 206 is equal to the inner diameter of the input pipe 202. The input pipe 202 is communicated with the conveying cavity 201, so that the molten metal is conveyed to the conveying cavity 201, and the molten metal is conveyed to the conveying cavity 201 through the feed pipe 206.

[0023] Furthermore, the installation component 3 includes a fixed plate 301, a rotating column 302 and an installation plate 303. The bottom end of the fixed plate 301 is rotatably connected to the rotating column 302, and the bottom end of the rotating column 302 is fixed with the installation plate 303. When the two installation components 3 are working, the fixed plate 301 is respectively fixed to the appropriate positions on the support shell 1 and the insulation shell, and then the support shell 1 and the insulation block 2 are supported on the installation plate 303 by the rotating column 302. The installation plate 303 is placed in a suitable installation position and can be installed after being rotated to align with the hole position.

[0024] The operation process of this embodiment is: when working, first determine the corresponding position where the output chamber 4 is placed when working, rotate the support shell 1, so that the output chamber 4 is rotated to the specified position, and then rotate the two mounting disks 303 respectively. After rotating until the holes are aligned, insert the mounting bolts into the mounting disks 303 and then screw them into the installation position, so that when working, the support shell 1 and the insulation block 2 are installed in the appropriate position. Specific embodiment 2

[0025] See also Figure 1 , 5 6. Based on the specific embodiment 1, a fixing port 401 is opened in the center of one side of the output chamber 4 close to the supporting shell 1 , and the fixing port 401 is connected to the insulation pipe 103 . The output chamber 4 is connected to the insulation pipe 103 through the fixing port 401 .

[0026] Specifically, a pulling handle 501 is fixed at the center of the top of the sealing plate 5, and fastening bolts 502 are inserted through the four corners of the sealing plate 5. The fastening bolts 502 are threadedly connected to the top of the output chamber 4. The sealing plate 5 provides a pulling effect through the pulling handle 501. After the fastening bolts 502 are inserted into the sealing plate 5, they are screwed into the top of the output chamber 4, so that the top of the output chamber 4 is closed when working.

[0027] The operation process of this embodiment is as follows: when working, the molten metal conveying device conveys the molten metal to the feed pipe 206, conveys it to the input pipe 202 through the feed pipe 206, conveys it to the conveying cavity 201 through the input pipe 202, conveys it to the inner tube 101 in the support shell 1 through the conveying cavity 201, conveys it to the insulation tube 103 through the inner tube 101, and then conveys it to the output cavity 4 through the insulation tube 103, wherein the normal molten metal is screened out through the sieve plate 505 in the fixed frame 504 in the output cavity 4 and conveyed to the output block 6, and the oxide scale, residue, etc. in the molten metal are removed. , remaining on the sieve plate 505. When the external equipment for conveying molten metal stops working, unscrew the fastening bolt 502, pull the pulling handle 501 through the lifting equipment, and connect it with the fixed frame 504 through the connecting rod 503, so that the sealing plate 5 rises, driving the fixed frame 504 to rise, and the metal oxide scale, residue, etc. on the sieve plate 505 rise to leave the output chamber 4, and then it can be cleaned. After cleaning, the sealing plate 5 is reset, and the fastening bolt 502 is inserted into the sealing plate 5, and then screwed into the top of the output chamber 4, so that the top of the output chamber 4 is closed when working. Specific embodiment three

[0028] See also Figure 1 , 7 8. On the basis of the specific embodiment 1, a through hole 601 is vertically opened in the output block 6, and the through hole 601 is connected with the output shell 402. A discharge pipe 603 is fixed to the bottom of the output block 6. The through hole 601 and the discharge pipe 603 correspond in position, and the inner diameter of the through hole 601 is equal to the inner diameter of the discharge pipe 603. The output block 6 transports the molten metal in the output shell 402 to the discharge pipe 603 through the through hole 601, and discharges it into the casting equipment through the discharge pipe 603.

[0029] Specifically, an electric push rod 701 is fixed on the inner wall of the installation frame 7, a baffle 702 is fixed to the telescopic end of the electric push rod 701, a gate 703 is fixed to the side of the baffle 702 away from the electric push rod 701, and the installation frame 7 drives the baffle 702 through the electric push rod 701, driving the gate 703 to move in and out of the output block 6.

[0030] Furthermore, a socket 602 is provided in the middle of one side of the output block 6 close to the mounting frame 7 , the socket 602 is connected to the through hole 601 , and the gate 703 is inserted into the socket 602 so that the gate 703 closes the through hole 601 on the output block 6 .

[0031] The operation process of this embodiment is as follows: during operation, after the molten metal enters the output cavity 4, it is transported to the output shell 402, transported to the through-port 601 on the output block 6 through the output shell 402, transported to the discharge pipe 603 through the through-port 601, and discharged into the casting cavity through the discharge pipe 603. When the casting is completed, the electric push rod 701 is started, the electric push rod 701 pushes the baffle 702, and drives the gate 703 to move until the gate 703 is fully inserted into the socket 602, closing the through-port 601, so that the molten metal in the through-port 601 is blocked during operation. When the molten metal needs to be transported, the electric push rod 701 is started, the electric push rod 701 drives the baffle 702 to drive the gate 703 to move away from the through-port 601, so that the molten metal enters the discharge pipe 603 through the through-port 601, and is discharged through the discharge pipe 603.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0033] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A molten metal drainage structure for large castings, comprising a support shell (1), a heat insulation block (2), a mounting assembly (3), an output cavity (4) and a sealing plate (5), characterized in that: A heat-insulating block (2) is fixed to one end of the support shell (1); an outer heat-insulating sleeve (203) is fixed to the top of the heat-insulating block (2); an input pipe (202) is fixed inside the outer heat-insulating sleeve (203); a top end of the input pipe (202) extends out of a top end of the outer heat-insulating sleeve (203); a connecting ring (204) is fixed to the peripheral side of the input pipe (202) above the outer heat-insulating sleeve (203); a ring sleeve (205) is movably connected to the peripheral side of the connecting ring (204); a mounting assembly (3) is fixed to the bottom of the heat-insulating block (2) and to the edge of the bottom of the support shell (1) away from the heat-insulating block (2); and an end of the support shell (1) away from the heat-insulating block (2) is fixedly connected to the heat-insulating sleeve (205). The insulating tube (103) is provided with an output chamber (4) fixed at one end of the insulating tube (103) away from the supporting shell (1), a sealing plate (5) is fixed at the top of the output chamber (4), four connecting rods (503) are fixed at the bottom of the sealing plate (5), a fixing frame (504) is fixed at the bottom ends of all the connecting rods (503), a sieve plate (505) is fixed in the fixing frame (504), the fixing frame (504) is movably connected in the output chamber (4), the bottom end of the output chamber (4) is fixedly connected to the output shell (402), an output block (6) is fixed at the bottom of the output shell (402), and a mounting frame (7) is fixed on one side of the output block (6).

2. The molten metal drainage structure for large castings according to claim 1, characterized in that: An inner tube (101) is fixedly passed through the support shell (1) along the length direction, a filling layer (102) is fixedly provided between the inner tube (101) and the inner wall of the support shell (1), an end of the inner tube (101) close to the heat-insulating block (2) is fixedly connected to the conveying cavity (201), and an end of the inner tube (101) away from the heat-insulating block (2) is fixedly connected to the heat-insulating tube (103).

3. The molten metal drainage structure for large castings according to claim 1, characterized in that: The bottom end of the input pipe (202) is fixed to the top of the heat-insulating block (2) and communicates with the upper part of the peripheral side of the conveying cavity (201). A feed pipe (206) is fixed to the top end of the annular sleeve (205). The inner diameter of the feed pipe (206) is equal to the inner diameter of the input pipe (202).

4. The molten metal drainage structure for large castings according to claim 1, characterized in that: The mounting assembly (3) comprises a fixed disk (301), a rotating column (302) and a mounting disk (303); the bottom end of the fixed disk (301) is rotatably connected to the rotating column (302), and the bottom end of the rotating column (302) is fixed with the mounting disk (303).

5. The molten metal drainage structure for large castings according to claim 1, characterized in that: A fixing opening (401) is provided in the centre of one side of the output chamber (4) close to the supporting shell (1), and the fixing opening (401) is in communication with the heat preservation pipe (103).

6. The molten metal drainage structure for large castings according to claim 1, characterized in that: A pulling handle (501) is fixed at the center of the top of the sealing plate (5), and fastening bolts (502) are inserted through the four corners of the sealing plate (5), and the fastening bolts (502) are threadedly connected to the top of the output chamber (4).

7. The molten metal drainage structure for large castings according to claim 1, characterized in that: A through hole (601) is vertically opened in the output block (6), the through hole (601) is in communication with the output shell (402), a discharge pipe (603) is fixed at the bottom of the output block (6), the through hole (601) and the discharge pipe (603) correspond in position, and the inner diameter of the through hole (601) is equal to the inner diameter of the discharge pipe (603).

8. The molten metal drainage structure for large castings according to claim 7, characterized in that: An electric push rod (701) is fixed on the inner wall of the installation frame (7), a baffle (702) is fixed to the telescopic end of the electric push rod (701), and a gate plate (703) is fixed to the side of the baffle (702) away from the electric push rod (701).

9. The molten metal drainage structure for large castings according to claim 8, characterized in that: A socket (602) is provided in the middle of one side of the output block (6) close to the mounting frame (7); the socket (602) is communicated with the through hole (601); and the gate plate (703) is plugged into the socket (602).

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