CN114336313B - An electromechanical device with built-in fire extinguishing function - Google Patents

Abstract

The invention relates to the technical field of electromechanical equipment, and discloses an electromechanical equipment with a fire extinguishing function, which includes a box body, an opening is arranged on the front side of the box body, and a door panel is hinged at the opening, the box body The upper end is fixedly connected with the monitoring system through the installation port, and the left and right sides of the box are fixedly connected with the wind collecting hood through the rectangular opening, and a blocking mechanism is connected between the two wind collecting hoods, and the blocking mechanism is installed on Between the two air collecting hoods, it is used to block the air delivered by the air collecting hoods to the box when a fire occurs. The electromechanical equipment with its own fire extinguishing function can quickly block the outside air from entering the electromechanical equipment when a fire occurs, and can also spray flame-retardant gas into the electromechanical equipment to suppress the spread of fire in time and realize rapid fire extinguishing.

Description

An electromechanical device with built-in fire extinguishing function

technical field

The invention relates to the technical field of electromechanical equipment, in particular to an electromechanical equipment with a built-in fire extinguishing function.

Background technique

The main function of the switchgear is a kind of electromechanical equipment for opening, closing, controlling and protecting electrical equipment during the process of power generation, transmission, distribution and power conversion in the power system. The main components in it are circuit breakers and isolating switches. , load switch, operating mechanism, transformer and various protection devices, etc., it can distribute electric energy reasonably, facilitate people to open and close the circuit, and is widely used in various power facilities;

Since a variety of electrical components are integrated in the electromechanical equipment, factors such as high temperature, overvoltage and overcurrent of the circuit will accelerate the aging of the circuit and cause a short circuit, which may cause a fire inside the electromechanical equipment. , Real-time monitoring of electrical equipment, timely alarm, and reduce economic losses caused by fire accidents of electromechanical equipment.

At present, although the monitoring and alarm system can monitor the electromechanical equipment in real time, when a fire occurs, because the electromechanical equipment does not have the function of self-extinguishing fire, the fire caused by the electrical equipment cannot be suppressed in time, and it will still cause large economic losses.

Contents of the invention

(1) Solved technical problems

Aiming at the deficiencies of the prior art, the present invention provides an electromechanical device with a fire extinguishing function, which can quickly block the outside air from entering the electromechanical device when a fire occurs, and can inject flame-retardant gas into the electromechanical device itself, The advantages of timely suppressing the spread of fire and realizing rapid fire extinguishing solve the problem that the fire caused by electrical equipment cannot be suppressed in time because the electromechanical equipment does not have the independent fire extinguishing function, which will still cause large economic losses.

(2) Technical solution

In order to achieve the above object, the present invention provides the following technical solutions: a kind of electromechanical equipment with fire extinguishing function, including a box body, the front side of the box body is provided with an opening, and the opening is hinged with a door panel, the box body The upper end of the body is fixedly connected with the monitoring system through the installation port, and the left and right sides of the box body are fixedly connected with the wind collecting hood through the rectangular opening, and a blocking mechanism is connected between the two wind collecting hoods, and the blocking mechanism Installed between two air collecting hoods, it is used to block the air delivered by the air collecting hoods to the box when a fire occurs;

The box is fixedly connected with a horizontal plate, the side wall of the horizontal plate is fixedly connected with two conduits through through holes, one of the conduits is fixedly connected with an exhaust fan, and the side wall of the wind collecting hood is connected with the The nozzle at the lower end of the conduit is fixedly connected, the lower end of the horizontal plate is fixedly connected with two mounting plates, the lower ends of the two mounting plates are jointly fixedly connected with a fixed plate, and the side wall of one of the mounting plates is connected with a transmission mechanism, and the transmission mechanism is connected with a positioning plate;

A motor is fixedly connected to the side wall of the fixing plate, and a first bevel gear is fixedly connected to the output end of the motor, and the first bevel gear is respectively connected to the blocking mechanism and the transmission mechanism.

Preferably, an air tank is fixedly connected in the box, and the side wall of the gas tank is connected with a filling nozzle and an air pressure gauge, and one side of the air tank is fixedly connected with an exhaust pipe, and at the mouth of the exhaust pipe An exhaust mechanism is connected, and the transmission mechanism is connected with the exhaust mechanism through a positioning plate. When a fire occurs, the exhaust mechanism is opened by the transmission mechanism to discharge the flame-retardant gas in the gas tank and send it to the box.

Preferably, the blocking mechanism includes a two-way screw, both ends of the two-way screw are fixedly connected to the opposite sides of the two wind collecting hoods through ball bearings, and the wall of the two-way screw is fixedly connected with The second bevel gear, the second bevel gear meshes with the first bevel gear, a rectangular tube is fixedly connected to one side of the wind collecting hood, a rectangular rod is sleeved inside the rectangular tube, and the rod wall of the rectangular rod is An internally threaded pipe is fixedly connected, and the internally threaded pipe is threadedly connected with the rod wall of the two-way screw rod. The lower end of the conduit extends into the wind collecting hood and is connected with a partition through a rotating shaft. One end of the rectangular rod extends to below the partition.

Preferably, one end of the rectangular rod is sleeved with a roller through the notch, and the roller is rotatably connected to the opposite sides of the notch through the support shaft, the lower end of the partition is fixedly connected with a triangular block, and the side wall of the triangular block is connected to the roller One side of the triangular block is fixedly connected with an elastic pull cord, and one end of the elastic pull cord is fixedly connected with the inner side of the wind collecting hood.

Preferably, the transmission mechanism includes a screw rod, one end of the screw rod is rotatably connected to the side wall of the mounting plate through a rolling bearing, and the other end of the screw rod is fixedly connected with a third bevel gear, and the third bevel gear is connected to the One side of the first bevel gear meshes, a bearing seat is connected to the wall of the screw rod, and the lower end of the bearing seat is fixedly connected with the upper end of the fixing plate, and one side of the mounting plate is sleeved with two square holes. A fixed rod, one end of the two fixed rods is fixedly connected with a fixed block, and the side wall of the fixed block is threadedly connected with the rod wall of the screw rod through a threaded hole, and the other ends of the two fixed rods are connected with one of the positioning plates. Side fixed connection.

Preferably, the exhaust mechanism includes a hexagonal block, the lower end of the hexagonal block is provided with a threaded blind hole, and a spacer is connected in the threaded blind hole, and the upper end of the exhaust pipe is connected with the external thread and the threaded blind hole. The hole is connected and pressed against the spacer. The upper end of the hexagonal block is provided with a puncture hole, and a puncture tube is sleeved in the puncture hole. The upper end of the puncture tube is fixedly connected with a sleeve, and the tube of the sleeve A guide pipe is sleeved on the wall, and the side wall of the horizontal plate is fixedly connected with the pipe wall of the guide pipe through an assembly hole. The upper end of the tube is fixedly connected with a spring, one side of the guide tube is provided with a gap, the tube wall of the sleeve is provided with a positioning groove, and one end of the positioning plate passes through the gap and snaps into the positioning groove .

(3) Beneficial effects

Compared with the prior art, the present invention provides an electromechanical device with its own fire extinguishing function, which has the following beneficial effects:

1. When the present invention is in use, when the monitoring system detects that the electrical equipment inside the box is on fire, the controller in the monitoring system controls the motor to rotate, and when the motor rotates, it drives the first bevel gear to make the blocking mechanism block the two wind collecting hoods The ventilation path, so that the inside of the box is in a sealed state, so that external air can be prevented from entering the box to support combustion. At the same time, when the first bevel gear rotates, the transmission mechanism is driven to work. When the transmission mechanism is working, the positioning plate is used to open the exhaust mechanism. The fire extinguishing gas stored in the tank is ejected from the exhaust pipe, and the ejected gas can play a flame-retardant role in the box in time, which can effectively suppress the fire in the electromechanical equipment and achieve the effect of self-extinguishing fire. Reduced economic losses caused by fire.

2. The blocking mechanism provided in the present invention, when the motor drives the first bevel gear to rotate the second bevel gear, the second bevel gear rotates to drive the two-way screw to rotate, and when the two-way screw rotates, it drives the inner threaded tube on the rod wall When the inner threaded tube moves, it drives the rectangular rod to make the roller squeeze the triangular block, and the triangular block is forced to drive the partition to contact the lower end of the conduit, so that the air in the conduit at the blocked end flows into the box, thereby isolating oxygen and blocking burning effect.

3. The transmission mechanism and exhaust mechanism provided in the present invention, when the motor drives the first bevel gear to rotate the third bevel gear, the third bevel gear rotates to drive the screw mandrel so that the fixed block and the fixed rod will move the positioning plate from the gap to the positioning Quickly withdraw from the groove, at this time, the elastic force of the spring quickly pushes the sleeve to make the puncture tube pop out and pierce the partition. After the partition is pierced, the fire extinguishing gas in the gas tank is discharged into the box through the exhaust pipe, and then can be When there is a fire, it sprays out the fire extinguishing gas to extinguish the fire, so that it can realize the automatic fire extinguishing at the first time when the mechanical and electrical equipment is on fire, and reduce the economic loss caused by the fire.

Description of drawings

Fig. 1 is a kind of mechanical and electrical equipment structure schematic diagram with fire extinguishing function that the present invention proposes;

Fig. 2 is a schematic diagram of the internal structure of the cabinet in a kind of electromechanical equipment with fire extinguishing function proposed by the present invention;

Fig. 3 is a schematic diagram of the connection structure between the blocking mechanism and the wind collecting hood in the electromechanical equipment with its own fire extinguishing function proposed by the present invention;

Fig. 4 is a schematic diagram of the internal structure of the wind collecting hood in the electromechanical equipment with fire extinguishing function proposed by the present invention;

Fig. 5 is a structural schematic diagram of an air tank and two wind collecting hoods in a box body of an electromechanical device with a built-in fire extinguishing function proposed by the present invention;

Fig. 6 is a partial structural schematic diagram of a blocking mechanism in an electromechanical device with a built-in fire extinguishing function proposed by the present invention;

Fig. 7 is a structural schematic diagram of a transmission mechanism and an exhaust mechanism in an electromechanical device with a built-in fire extinguishing function proposed by the present invention.

In the figure: 1, box body; 2, wind collecting hood; 3, door panel; 4, air tank; 5, horizontal plate; 6, duct; 7, exhaust fan; 8, partition; 9, triangular block; 10, elastic pull Rope; 11, two-way screw mandrel; 12, rectangular tube; 13, rectangular rod; 14, internally threaded tube; 15, second bevel gear; 16, mounting plate; 17, fixed plate; 18, first bevel gear; 19, Motor; 20, fixed rod; 21, hexagonal block; 22, exhaust pipe; 23, guide pipe; 24, roller; 25, spring; 26, casing; 27, puncture tube; Positioning plate; 30, fixed block; 31, screw mandrel; 32, bearing seat; 33, the third bevel gear; 34, retaining ring.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1:

Referring to accompanying drawings 1-7, a kind of electromechanical equipment with built-in fire extinguishing function includes a box body 1, the front side of the box body 1 is provided with an opening, and a door panel 3 is hinged at the opening, and the upper end of the box body 1 passes through the installation port The monitoring system is fixedly connected, and the left and right sides of the box body 1 are fixedly connected with the air collecting hood 2 through the rectangular opening, and a blocking mechanism is connected between the two air collecting hoods 2, and the blocking mechanism is installed between the two air collecting hoods 2 The space is used to block the air transported by the air collecting hood 2 into the box body 1 when a fire occurs;

The box body 1 is fixedly connected with a horizontal plate 5, and the side wall of the horizontal plate 5 is fixedly connected with two conduits 6 through a through hole, and an exhaust fan 7 is fixedly connected in one of the conduits 6, and the side wall of the wind collecting hood 2 is connected with the The nozzle at the lower end of the conduit 6 is fixedly connected, the lower end of the horizontal plate 5 is fixedly connected with two mounting plates 16, the lower ends of the two mounting plates 16 are jointly fixedly connected with a fixed plate 17, and the side wall of one of the mounting plates 16 is connected with a transmission mechanism, and the transmission mechanism is connected with a positioning plate 29;

The side wall of the fixed plate 17 is fixedly connected with a motor 19, and the output end of the motor 19 is fixedly connected with a first bevel gear 18, and the first bevel gear 18 is respectively connected with the blocking mechanism and the transmission mechanism, and the gas tank 4 is fixedly connected in the box body 1 , and the side wall of the gas tank 4 is connected with a filling nozzle and an air pressure gauge, and one side of the gas tank 4 is fixedly connected with an exhaust pipe 22, and the mouth of the exhaust pipe 22 is connected with an exhaust mechanism, and the transmission mechanism is positioned by The plate 29 is connected with the exhaust mechanism. The exhaust mechanism is opened by the transmission mechanism when a fire occurs, and the flame retardant gas in the gas tank 4 is discharged and sent to the box body 1. The power input end of the motor 19 is controlled by the monitoring system. When the monitoring system detects that a fire occurs, the power supply of the motor 19 is turned on to drive the blocking mechanism and the transmission mechanism, and is used to release the common inert fire extinguishing gas stored in the gas tank 4, such as carbon dioxide and other gases. This technology has been used in daily life. It is widely used and known to those skilled in the art, so it is not repeated here.

When the present invention is in use, when the monitoring system detects that the electrical equipment inside the box body 1 is on fire, the controller in the monitoring system controls the rotation of the motor 19, and when the motor 19 rotates, it drives the first bevel gear 18 to make the blocking mechanism block the two sets. The ventilation path of the windshield 2 further makes the inside of the box body 1 in a sealed state, so that external air can be prevented from entering the box body 1 to support combustion. At the same time, the transmission mechanism is driven to work when the first bevel gear 18 rotates, and the positioning plate is used when the transmission mechanism works. 29 Open the exhaust mechanism, so that the fire extinguishing gas stored in the gas tank 4 is ejected from the exhaust pipe 22, and the ejected gas can play a role of flame retardancy in the box body 1 in time, thereby effectively suppressing the fire of the electromechanical equipment. The internal fire can play the effect of self-extinguishing fire, thereby reducing the economic loss caused by fire.

Embodiment 2: the difference based on embodiment 1 is;

Referring to accompanying drawings 3-6, the blocking mechanism includes a two-way screw rod 11, both ends of the two-way screw rod 11 are respectively fixedly connected to the opposite sides of the two wind collecting covers 2 through ball bearings, and the two-way screw rod 11 is fixed on the rod wall. A second bevel gear 15 is connected, and the second bevel gear 15 meshes with the first bevel gear 18. One side of the wind collecting hood 2 is fixedly connected with a rectangular tube 12, and a rectangular rod 13 is sleeved inside the rectangular tube 12. The rectangular rod 13 The rod wall is fixedly connected with an internally threaded pipe 14, which is threadedly connected with the rod wall of the two-way screw rod 11, and the lower end of the conduit 6 extends into the wind collecting hood 2 and is connected with a partition 8 and a rectangular rod 13 through a rotating shaft. One end of the rectangular rod 13 extends below the partition 8, and one end of the rectangular rod 13 is sleeved with a roller 24 through the gap, and the roller 24 is rotationally connected to the two sides opposite to the gap through the support shaft, and the lower end of the partition 8 is fixedly connected with a triangular block 9, And the side wall of the triangular block 9 is in contact with the side wall of the roller 24 , one side of the triangular block 9 is fixedly connected with an elastic stay cord 10 , and one end of the elastic stay cord 10 is fixedly connected with the inside of the wind collecting hood 2 .

The blocking mechanism provided in the present invention, when the motor 19 drives the first bevel gear 18 to rotate the second bevel gear 15, the rotation of the second bevel gear 15 drives the rotation of the two-way screw rod 11, and when the rotation of the two-way screw rod 11 drives the rotation on the rod wall The internally threaded tube 14 moves, and when the internally threaded tube 14 moves, it drives the rectangular rod 13 to make the roller 24 squeeze the triangular block 9, and the triangular block 9 is forced to drive the partition 8 to contact the lower end of the conduit 6, thereby realizing the air flow in the blocked end conduit 6. Flow into the box body 1, and then play the role of isolating oxygen and flame retardant.

Embodiment 3: the difference based on embodiment 1 is;

Referring to accompanying drawing 7 transmission mechanism comprises screw mandrel 31, and one end of screw mandrel 31 is connected with the side wall of mounting plate 16 by rolling bearing rotatably, and the other end of screw mandrel 31 is fixedly connected with the 3rd bevel gear 33, and the 3rd bevel gear 33 is connected with the 3rd bevel gear 33. One side of a bevel gear 18 meshes, and the rod wall of the screw mandrel 31 is connected with a bearing seat 32, and the lower end of the bearing seat 32 is fixedly connected with the upper end of the fixed plate 17, and one side of the mounting plate 16 is sleeved with two holes through a square hole. One fixed rod 20, one end of two fixed rods 20 is fixedly connected with fixed block 30, and the side wall of fixed block 30 is threadedly connected with the rod wall of screw mandrel 31 through threaded hole, and the other end of two fixed rods 20 is all with positioning One side of the plate 29 is fixedly connected;

The exhaust mechanism includes a hexagonal block 21, the lower end of the hexagonal block 21 is provided with a threaded blind hole, and a spacer 28 is connected in the threaded blind hole, and the upper end of the exhaust pipe 22 is connected with the threaded blind hole through an external thread and pressed tightly. The upper end of the spacer piece 28 and the hexagonal block 21 is provided with a puncture hole, the puncture hole is sleeved with a puncture tube 27, the upper end of the puncture tube 27 is fixedly connected with a sleeve 26, and the tube wall of the sleeve 26 is sleeved with a guide tube 23. The side wall of the horizontal plate 5 is fixedly connected with the pipe wall of the guide pipe 23 through the assembly hole, and the inner edge of the upper end nozzle of the guide pipe 23 is fixedly connected with a retaining ring 34, and the retaining ring 34 is connected with the upper end nozzle of the casing 26. A spring 25 is fixedly connected together, a gap is provided on one side of the guide tube 23, a positioning groove is provided on the tube wall of the casing 26, and one end of the positioning plate 29 passes through the gap and is engaged with the positioning groove.

The transmission mechanism and exhaust mechanism provided in the present invention, when the motor 19 drives the first bevel gear 18 to rotate the third bevel gear 33, the third bevel gear 33 rotates to drive the screw rod 31 to move the fixed block 30, and the fixed block 30 moves Drive the fixing rod 20 to quickly extract the positioning plate 29 from the gap and the positioning groove. At this time, the elastic force of the spring 25 quickly pushes the sleeve 26 to make the puncture tube 27 pop up. When the puncture tube 27 pops up, it passes through the puncture hole on the hexagonal block 21 And puncture the partition plate 28, when the partition sheet 28 was punctured, the fire extinguishing gas in the gas tank 4 was discharged through the exhaust pipe 22, and the fire extinguishing gas passed through the puncture pipe 27, the sleeve pipe 26 and the guide pipe 23 to enter the tank successively. In the body 1, the fire extinguishing gas can be ejected automatically to extinguish the fire when there is a fire, so that the automatic fire extinguishing can be realized at the first time when the electromechanical equipment is on fire, and the economic loss caused by the fire can be reduced.

It should be noted that the term "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also items not expressly listed other elements, or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (4)

1. The utility model provides an electromechanical device from function of putting out a fire, includes box (1), the front side of box (1) is equipped with the opening, and the opening part has door plant (3) through the hinge joint, the upper end of box (1) is through installing port fixedly connected with monitoring system, its characterized in that: the left side and the right side of the box body (1) are fixedly connected with air collecting hoods (2) through rectangular openings, a blocking mechanism is commonly connected between the two air collecting hoods (2), and the blocking mechanism is arranged between the two air collecting hoods (2) and used for blocking air conveyed into the box body (1) by the air collecting hoods (2) when a fire disaster occurs;

the novel air conditioner is characterized in that a transverse plate (5) is fixedly connected in the box body (1), two guide pipes (6) are fixedly connected to the side wall of the transverse plate (5) through a through hole, an exhaust fan (7) is fixedly connected to one of the guide pipes (6), the side wall of the air collecting cover (2) is fixedly connected with the lower pipe orifice of the guide pipe (6) through a square opening, two mounting plates (16) are fixedly connected to the lower end of the transverse plate (5), a fixing plate (17) is fixedly connected to the lower ends of the two mounting plates (16) together, a transmission mechanism is connected to the side wall of one mounting plate (16), and a positioning plate (29) is connected to the transmission mechanism;

the side wall of the fixed plate (17) is fixedly connected with a motor (19), the output end of the motor (19) is fixedly connected with a first bevel gear (18), and the first bevel gear (18) is respectively connected with the blocking mechanism and the transmission mechanism;

the utility model discloses a gas tank, including box (1), gas pitcher (4), and the lateral wall of gas pitcher (4) is connected with filling mouth and barometer, one side fixedly connected with blast pipe (22) of gas pitcher (4), and the mouth of pipe department of blast pipe (22) is connected with exhaust mechanism, drive mechanism passes through locating plate (29) and is connected with exhaust mechanism, exhaust mechanism includes six arriss piece (21), threaded blind hole has been seted up to the lower extreme of six arriss piece (21), and threaded blind hole internal connection has baffle (28), the upper end of blast pipe (22) is connected with threaded blind hole through the external screw thread and compresses tightly baffle (28), puncture hole has been seted up to the upper end of six arriss piece (21), cup joint puncture pipe (27) in the puncture hole, the upper end fixedly connected with sleeve pipe (26) of puncture pipe (27), cup joint guide tube (23) on the pipe wall of sleeve (26), the lateral wall of diaphragm (5) passes through the pipe wall fixedly connected with guide tube (23), the upper end of guide tube (23) is connected with the locating plate (26) and is equipped with the mouth of pipe (26), the mouth of pipe (25) is cut in common in the mouth of pipe (25) is cut in the mouth of pipe (25), the exhaust mechanism is opened by the transmission mechanism when a fire disaster occurs, and the flame retardant gas in the gas tank (4) is discharged and sent into the box body (1).

2. An electromechanical device with fire extinguishing function according to claim 1, characterized in that: the blocking mechanism comprises a bidirectional screw rod (11), two ends of the bidirectional screw rod (11) are fixedly connected with one sides, opposite to the two wind collecting hoods (2), of the bidirectional screw rod (11) respectively through ball bearings, a second bevel gear (15) is fixedly connected to the rod wall of the bidirectional screw rod (11), the second bevel gear (15) is meshed with a first bevel gear (18), a rectangular pipe (12) is fixedly connected to one side of the wind collecting hood (2), a rectangular rod (13) is sleeved in the rectangular pipe (12), an inner threaded pipe (14) is fixedly connected to the rod wall of the rectangular rod (13), the inner threaded pipe (14) is in threaded connection with the rod wall of the bidirectional screw rod (11), the lower end of the guide pipe (6) extends into the wind collecting hoods (2) and is rotationally connected with a partition plate (8) through a rotating shaft, and one end of the rectangular rod (13) extends to the lower side of the partition plate (8).

3. An electromechanical device with fire extinguishing function according to claim 2, characterized in that: one end of the rectangular rod (13) is sleeved with the idler wheel (24) through the notch, the idler wheel (24) is connected with two opposite sides of the notch through the supporting shaft in a rotating mode, the lower end of the partition plate (8) is fixedly connected with the triangular block (9), the side wall of the triangular block (9) is in contact with the side wall of the idler wheel (24), one side of the triangular block (9) is fixedly connected with the elastic pull rope (10), and one end of the elastic pull rope (10) is fixedly connected with the inner side of the wind collecting cover (2).

4. An electromechanical device with fire extinguishing function according to claim 1, characterized in that: the transmission mechanism comprises a screw rod (31), one end of the screw rod (31) is rotationally connected with the side wall of the mounting plate (16) through a rolling bearing, a third bevel gear (33) is fixedly connected with the other end of the screw rod (31), the third bevel gear (33) is meshed with one side of the first bevel gear (18), a bearing seat (32) is connected on the rod wall of the screw rod (31), the lower end of the bearing seat (32) is fixedly connected with the upper end of the fixing plate (17), two fixing rods (20) are sleeved on one side of the mounting plate (16) through square holes, a fixing block (30) is fixedly connected with one end of each fixing rod (20), the side wall of each fixing block (30) is in threaded connection with the rod wall of the screw rod (31) through a threaded hole, and the other ends of the two fixing rods (20) are fixedly connected with one side of the positioning plate (29).

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