CN109130477B - A printing machine with automatic paper feeding and paper taking to reduce dust pollution - Google Patents

Abstract

The invention discloses a printing machine with automatic paper feeding and paper taking to reduce dust pollution, comprising a printing machine body, a switch group is arranged on the side of the printing machine body, and a paper feeding port of the printing machine body is provided with The mobile device, the left end of the sliding rail of the mobile device is provided with a fixed frame, the linear motor side of the mobile device is provided with a lifting frame, the side of the second connecting plate of the lifting frame is provided with a fixed frame, and the interior of the fixed frame is provided with a lifting frame. The adsorption rack is provided with rotating shafts at both ends of the rectangular box body of the adsorption rack. The printing machine with automatic paper feeding and paper taking can reduce dust pollution, can adsorb, transport, turn and print the paper, can reduce the labor intensity of the staff, save manpower, and can classify and store the paper before and after printing , It can also carry out dust removal operation on the printed paper to reduce the harm caused by dust to the environment and operators, and it is easy to use.

Description

A printing machine with automatic paper feeding and paper taking to reduce dust pollution

technical field

The invention relates to the technical field of printing presses, in particular to a printing press with automatic paper feeding and paper taking which can reduce dust pollution.

Background technique

A machine for printing text and images. Modern printing presses are generally composed of plates, inking, embossing, and paper feeding. Its working principle is: first, the text and images to be printed are made into printing plates, which are installed on the printing press. Then, the ink is applied to the places with text and images on the printing plate manually or by a printing machine, and then directly or indirectly transferred to paper or other substrates, so as to reproduce the same printed matter as the printing plate. The invention and development of the printing press plays an important role in the spread of human civilization and culture. When the existing sheet-fed printing presses convey paper, they are usually put in manually, and taken out manually after the printing is completed, which wastes manpower, and the printing is completed. The dust on the back surface of the paper will drive the dust to spread in the air when the paper is taken out, causing dust pollution and inconvenient to use.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the existing defects, and to provide a printing machine with automatic paper feeding and paper fetching which can reduce dust pollution, which can adsorb, transport, turn and print the paper, and can reduce the labor of the staff. It is labor-intensive, saves manpower, and can classify and store the paper before and after printing, and can also perform dust removal operations on the paper after printing, so as to reduce the harm caused by dust to the environment and operators. It is easy to use and can effectively solve the problems in the background technology. question.

In order to achieve the above purpose, the present invention provides the following technical solutions: a printing press with automatic paper feeding and paper taking to reduce dust pollution, comprising a printing press body, a switch group is provided on the side of the printing press body, and the printing press The paper feeding port of the machine body is provided with a moving device, the left end of the sliding rail of the moving device is provided with a fixing frame, the side of the linear motor of the moving device is provided with a lifting frame, and the side of the second connecting plate of the lifting frame is provided with a fixing frame frame, the interior of the fixed frame is provided with an adsorption frame, the rectangular box body of the adsorption frame is provided with a rotating shaft at both ends, the side of the rotating shaft is rotatably connected with the fixed frame through a bearing, and the left end of the left rotating shaft is provided with a drive A storage device is provided at the lower end of the side of the printing press body corresponding to the suction rack, the inner side of the collection groove of the storage device is provided with a dust suction hole, and the left end of the side corresponding to the storage rack of the storage device and the suction hole is provided with a dust collector In the device, the input end of the printer body is electrically connected with the output end of the switch group, and the input end of the switch group is electrically connected with the output end of the external power supply.

As a preferred technical solution of the present invention, the moving device includes a slide rail, one end of the slide rail is fixedly connected to the printer body, and the other end of the slide rail is fixedly connected to the first connecting plate. A linear motor is slid on the side, and the input end of the linear motor is electrically connected with the output end of the switch group.

As a preferred technical solution of the present invention, the fixing frame includes a telescopic rod, the telescopic end of the telescopic rod is provided with a first connecting plate, and the fixed end of the telescopic rod is provided with a mounting plate, and the side surfaces of the mounting plate and The side surface of the printer body is provided with correspondingly arranged screw holes, and fixing bolts are threadedly connected inside the screw holes.

As a preferred technical solution of the present invention, the lifting frame includes a fixing plate, the fixing plate is fixedly connected with the side surface of the linear motor, and the lower surface of the fixing plate is provided with two symmetrically arranged first electric telescopic rods, so The fixed plate is connected with the fixed end of the first electric telescopic rod, the telescopic end of the first electric telescopic rod is provided with a second connecting plate, and the input end of the first electric telescopic rod is electrically connected with the output end of the switch group.

As a preferred technical solution of the present invention, the adsorption rack includes a rectangular box body, the upper surface edge of the rectangular box body is provided with through holes in a rectangular distribution, and the interior of the rectangular box body is provided with a negative pressure pump, so The air outlet of the negative pressure pump is provided with an exhaust pipe, the air outlet of the exhaust pipe is located on the lower surface of the rectangular box body, and the input end of the negative pressure pump is electrically connected to the output end of the switch group.

As a preferred technical solution of the present invention, the driving device includes a stepping motor, the stepping motor is fixedly connected to the side surface of the fixed frame through a fixing seat, and the output shaft of the stepping motor is connected to the left side through a coupling. The rotating shaft is fixedly connected, and the input end of the stepping motor is electrically connected with the output end of the switch group.

As a preferred technical solution of the present invention, the storage device includes a storage rack, the upper surface of the storage rack is provided with a storage box on the right end, and the left end of the left surface of the storage rack is provided with a collection slot, and the left side of the storage box is provided with a collection slot. There are rectangular grooves on the left side of the surface and the collecting tank.

As a preferred technical solution of the present invention, the lower surface of the storage rack is provided with pillars, there are at least six pillars, and the six pillars are distributed in a rectangular shape on the lower surface of the storage rack.

As a preferred technical solution of the present invention, the dust removal device includes a vacuum cleaner, and the feeding port of the vacuum cleaner is provided with a three-way pipe, and the front and rear nozzles of the three-way pipe are both provided with conveying pipes, so One end of the conveying pipe away from the tee pipe is provided with a collection funnel, the collection funnel is fixedly connected to the left end of the side surface of the storage rack, and the input end of the vacuum cleaner is electrically connected to the output end of the switch group.

As a preferred technical solution of the present invention, the side surface of the rectangular box body is provided with two symmetrically arranged positioning grooves, and the inner side surface of the fixed frame corresponding to the positioning grooves is provided with two symmetrically arranged second electric telescopic rods , and the fixed frame is connected with the fixed end of the second electric telescopic rod, and the input end of the second electric telescopic rod is electrically connected with the output end of the switch group.

Compared with the prior art, the beneficial effects of the present invention are:

1. This printing machine with automatic paper feeding and paper picking can reduce dust pollution. The mobile device can be fixed by the fixing frame, and the rectangular box body can be indirectly driven by the linear motor to move along the slide rail. It can also be driven by the first electric motor. The telescopic rod adjusts the height of the rectangular box body, which is convenient for conveying the paper and facilitating the printing operation of the paper.

2. This printing machine with automatic paper feeding and paper picking can reduce dust pollution. The negative pressure pump can reduce the internal pressure of the rectangular box, so that the paper can be adsorbed on the surface of the rectangular box, and can also be indirectly through the stepper motor. The rectangular box body is driven to rotate, which is convenient for turning the paper over, so as to adjust the position of the paper and facilitate the adsorption and printing operations of the paper.

3. This printing machine with automatic paper feeding and paper pickup can reduce dust pollution. The paper can be stored in the storage box, and the printed paper can be stored in the collection tank, and the printed paper can also be stored by the dust removal device. The dust on the surface is extracted and collected to reduce dust pollution, thereby protecting the environment and the health of operators.

4. This printing machine with automatic paper feeding and paper picking can reduce dust pollution. It can adsorb, transport, turn and print the paper, which can reduce the labor intensity of the staff and save manpower. It can be stored in different categories, and the printed paper can also be dedusted to reduce the harm caused by dust to the environment and operators, and it is easy to use.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the enlarged schematic diagram of structure A of the present invention;

Fig. 3 is the structural representation of the adsorption rack of the present invention;

Figure 4 is a schematic bottom view of the structure of the present invention.

In the picture: 1 printing machine body, 2 switch group, 3 moving device, 31 slide rail, 32 linear motor, 4 fixing frame, 41 first connecting plate, 42 telescopic rod, 43 mounting plate, 44 fixing bolt, 5 lifting frame, 51 fixed plate, 52 first electric telescopic rod, 53 second connecting plate, 6 fixed frame, 7 adsorption frame, 71 rectangular box, 72 through hole, 73 negative pressure pump, 74 exhaust pipe, 8 rotating shaft, 81 bearing, 9 Driving device, 91 fixing seat, 92 stepping motor, 93 coupling, 10 positioning slot, 11 storage device, 111 storage rack, 112 storage box, 113 rectangular slot, 114 collection slot, 12 dust suction hole, 13 dust removal device , 131 collection funnel, 132 conveying pipeline, 133 three-way pipe, 134 vacuum cleaner, 14 pillar, 15 second electric telescopic rod.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1-4, the present invention provides a technical solution: a printing machine with automatic paper feeding and paper taking to reduce dust pollution, including a printing machine body 1, and a switch group 2 is provided on the side of the printing machine body 1 , the paper feeding port of the printing machine body 1 is provided with a moving device 3, which can indirectly drive the rectangular box 71 to move along the sliding rail 31 through the linear motor 32. The moving device 3 includes the sliding rail 31, one end of the sliding rail 31 The other end of the slide rail 31 is fixedly connected to the first connecting plate 41, the side of the slide rail 31 is slidably provided with a linear motor 32, and the linear motor 32 is controlled by the switch group 2 to work, and the linear motor 32 can indirectly drive the rectangular box body 71 works, which is convenient for paper transportation. The input end of the linear motor 32 is electrically connected with the output end of the switch group 2. The left end of the slide rail 31 of the mobile device 3 is provided with a fixing frame 4, and the mobile device 3 can be fixed by the fixing frame 4. The fixing frame 4 includes a telescopic rod 42, which is convenient for fixing the sliding rails 31 with different lengths. The telescopic end of the telescopic rod 42 is provided with a first connecting plate 41, and the fixed end of the telescopic rod 42 is provided with a mounting plate 43. The side surface and the side surface of the printer body 1 are provided with correspondingly arranged screw holes, and the inside of the screw holes are threadedly connected with fixing bolts 44 . For fixing, at the same time, it is convenient to fix the slide rail 31. The side of the linear motor 32 of the mobile device 3 is provided with a lifting frame 5. The lifting frame 5 includes a fixing plate 51. The fixing plate 51 is fixedly connected with the side of the linear motor 32, and the fixing plate 51 is The lower surface is provided with two symmetrically arranged first electric telescopic rods 52, the fixing plate 51 is connected with the fixed end of the first electric telescopic rod 52, and the telescopic end of the first electric telescopic rod 52 is provided with a second connecting plate 53, which can be passed through The first electric telescopic rod 52 adjusts the height of the rectangular box body 71, which is convenient for conveying the paper and facilitating the printing operation of the paper, and the input end of the first electric telescopic rod 52 is electrically connected with the output end of the switch group 2, and the lifting frame A fixing frame 6 is provided on the side of the second connecting plate 53 of 72, and the inside of the rectangular box body 71 is provided with a negative pressure pump 73, the air outlet of the negative pressure pump 73 is provided with an exhaust pipe 74, and the air outlet of the exhaust pipe 74 is located on the lower surface of the rectangular box body 71, which can pass the negative pressure The pump 73 reduces the internal pressure of the rectangular box body 71, so that the paper can be adsorbed on the surface of the rectangular box body 71, and the input end of the negative pressure pump 73 is electrically connected with the output end of the switch group 2. In the initial position, the rectangular box body 71 is located at Just above the storage box 112, put the paper inside the storage box 112, control the first electric telescopic rod 52 and the negative pressure pump 73 to work through the switch group 2, the first electric telescopic rod 52 pushes the fixed frame 6 down, and the fixed frame 6 The rectangular box body 71 is driven down by the rotating shaft 8, so that the rectangular box body 71 is in contact with the paper, and the negative pressure pump 73 extracts the gas inside the rectangular box body 71, so that the paper Adsorbed on the side of the rectangular box 71 with the through hole 72, the side of the rectangular box 71 is provided with two symmetrically arranged positioning grooves 10, and the inner side of the fixed frame 6 corresponding to the positioning groove 10 is provided with two symmetrically arranged The second electric telescopic rod 15, the fixed frame 6 is connected to the fixed end of the second electric telescopic rod 15, the input end of the second electric telescopic rod 15 is electrically connected to the output end of the switch group 2, and the second electric telescopic rod 2 is controlled by the switch group 2. When the telescopic rod 15 works, the second electric telescopic rod 15 is extended and clamped with the positioning groove 10, so that the rectangular box body 71 cannot be rotated. The bearing 81 is rotatably connected to the fixed frame 6, and the left end of the left shaft 8 is provided with a drive device 9, the drive device 9 includes a stepping motor 92, and the stepping motor 92 is fixedly connected to the side of the fixed frame 6 through the fixed seat 91, and The output shaft of the stepping motor 92 is fixedly connected to the left rotating shaft 8 through the coupling 93, and the rectangular box body 71 can be indirectly driven to rotate through the stepping motor 92, which is convenient for turning the paper over, thereby adjusting the position of the paper, which is convenient for For paper adsorption and printing operations, the rotation angle range of the stepping motor 92 is one hundred and eighty degrees, and the angle of one rotation is one hundred and eighty degrees. 32 moves in the reverse direction, the linear motor 32 drives the rectangular box body 71 and the paper to move in the reverse direction along the slide rail 31, and makes the rectangular box body 71 located on the upper side of the collecting slot 114, which is convenient for the printing of the paper. The output end of the switch group 2 is electrically connected, and a storage device 11 is provided at the lower end of the side of the printer body 1 corresponding to the adsorption rack 7 . The storage device 11 includes a storage rack 111 . The left end of the left surface of the shelf 111 is provided with a collection slot 114 , and the left side of the storage box 112 and the left side of the collection slot 114 are provided with a rectangular slot 113 . For storing the printed paper, the lower surface of the storage rack 111 is provided with pillars 14, and there are at least six pillars 14. The six pillars 14 are distributed in a rectangular shape on the lower surface of the storage rack 111, and the inner side of the collection slot 114 of the storage device 11 is provided with There are dust suction holes 12, and the storage rack 111 of the storage device 11 is provided with a dust removal device 13 at the left end of the side corresponding to the dust suction hole 12. The dust removal device 13 can extract and collect the dust on the surface of the paper after printing to reduce dust pollution, thereby reducing environmental pollution. In order to protect the health of the operator, the dust removal device 13 includes a vacuum cleaner 134. The feeding port of the vacuum cleaner 134 is provided with a tee pipe 133. One end away from the tee pipe 133 is provided with a collection funnel 131 , the collection funnel 131 is fixedly connected to the left end of the side of the storage rack 111 , and the first electric telescopic rod 52 is controlled to extend through the switch group 2 , and the first electric telescopic rod 52 passes through the fixed frame 6 . Drive the rectangular box body 71 to move down, Then, the negative pressure pump 73 is controlled by the switch group 2 to stop working, so that the paper falls into the collection tank 114, and the vacuum cleaner 134 is controlled by the switch group 2 to work, the dust enters the collection funnel 131 through the dust suction hole 12, and the dust passes through the conveying pipeline. 132 is collected by the vacuum cleaner 134, and the input end of the vacuum cleaner 134 is electrically connected with the output end of the switch group 2, the input end of the printing machine body 1 is electrically connected with the output end of the switch group 2, and the input end of the switch group 2 is electrically connected with the output of the external power supply The terminals are electrically connected, and the switch group 2 is provided with control buttons corresponding to the printer body 1, the linear motor 32, the first electric telescopic rod 52, the negative pressure pump 73, the stepping motor 92, the vacuum cleaner 134 and the second electric telescopic rod 15. , The whole printing machine with automatic paper feeding and paper picking can reduce dust pollution, which can adsorb, transport, turn and print the paper, which can reduce the labor intensity of the staff, save manpower, and can classify the paper before and after printing. It can also be used to remove dust from the printed paper, reduce the harm caused by dust to the environment and operators, and is easy to use.

In use: in the initial position, the rectangular box body 71 is located directly above the storage box 112, the paper is placed inside the storage box 112, the first electric telescopic rod 52 and the negative pressure pump 73 are controlled by the switch group 2 to work, the first electric The telescopic rod 52 pushes the fixed frame 6 to move down, and the fixed frame 6 drives the rectangular box body 71 to move down through the rotating shaft 8, so that the rectangular box body 71 is in contact with the paper, and the negative pressure pump 73 extracts the gas inside the rectangular box body 71, thereby making the paper Adsorbed on the side of the rectangular box 71 with the through hole 72, the first electric telescopic rod 52 is controlled to shorten by the switch group 2, and the stepping motor 92 is controlled to work, and the stepping motor 92 drives the shaft 8 to rotate through the coupling 93. One hundred and eighty degrees, the rotating shaft 8 drives the rectangular box body 71 to rotate one hundred and eighty degrees, so that the paper faces upwards, and the linear motor 32 and the second electric telescopic rod 15 are controlled to work by the switch group 2, and the second electric telescopic rod 15 The linear motor 32 drives the fixed frame 6 to move along the slide rail 31 through the lifting frame 5, and the fixed frame 6 drives the rectangular box body 71 to move through the rotating shaft 8, thereby conveying the paper, through the switch group 2 Control the printing machine body 1 to work, the printing machine body 1 prints the paper, and then controls the linear motor 32 to move in the reverse direction through the switch group 2. The linear motor 32 drives the rectangular box body 71 and the paper to move in the reverse direction along the slide rail 31, and makes the rectangular box body 71 and the paper move in the reverse direction. The box body 71 is located on the upper side of the collecting tank 114, and the second electric telescopic rod 15 is controlled by the switch group 2 to shorten, and the stepping motor 92 is rotated 180 degrees in the opposite direction, and the first electric telescopic rod 52 is controlled by the switch group 2. Extend, the first electric telescopic rod 52 drives the rectangular box body 71 to move down through the fixed frame 6, and then controls the negative pressure pump 73 to stop working through the switch group 2, so that the paper falls into the collection tank 114, which is controlled by the switch group 2 The vacuum cleaner 134 works, the dust enters the collection funnel 131 through the dust suction hole 12, and the dust is collected by the vacuum cleaner 134 through the conveying pipe 132, thereby completing the paper conveying, printing and dust removal operations.

The invention can adsorb, transport, turn and print the paper, can reduce the labor intensity of the staff, save manpower, and can classify and store the paper before and after printing, and can also perform dust removal operation on the printed paper to reduce dust Hazards to the environment and operators, easy to use

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

Claims (10)

1. A printing press with automatic paper feeding and paper taking that can reduce dust pollution, comprising a printing press body (1), characterized in that: the side of the printing press body (1) is provided with a switch group (2), A moving device (3) is provided at the paper feeding port of the printing press body (1), and a fixing frame (4) is provided at the left end of the slide rail (31) of the moving device (3). A lifting frame (5) is provided on the side of the linear motor (32), a fixing frame (6) is arranged on the side of the second connecting plate (53) of the lifting frame (5), and the interior of the fixing frame (6) is provided with suction The frame (7), the rectangular box body (71) of the adsorption frame (7) is provided with a rotating shaft (8) at both ends, and the side surface of the rotating shaft (8) is rotatably connected with the fixed frame (6) through the bearing (81). , and the left end of the left rotating shaft (8) is provided with a drive device (9), and the lower end of the side of the printing press body (1) corresponding to the suction frame (7) is provided with a storage device (11), the storage device (11) ) is provided with a dust suction hole (12) on the inner side of the collection tank (114), and a dust removal device (13) is provided on the left end of the side corresponding to the storage rack (111) of the storage device (11) and the dust suction hole (12). The input end of the main body (1) is electrically connected with the output end of the switch group (2), and the input end of the switch group (2) is electrically connected with the output end of the external power supply. 2. A printing press with automatic paper feeding and paper picking capable of reducing dust pollution according to claim 1, characterized in that: the moving device (3) comprises a sliding rail (31), and the sliding rail ( One end of 31) is fixedly connected with the printer body (1), and the other end of the slide rail (31) is fixedly connected with the first connecting plate (41), and the side of the slide rail (31) is slidably provided with a linear motor (32). ), the input end of the linear motor (32) is electrically connected with the output end of the switch group (2). 3. A printing press with automatic paper feeding and paper pickup capable of reducing dust pollution according to claim 1, characterized in that: the fixing frame (4) comprises a telescopic rod (42), and the telescopic rod ( The telescopic end of 42) is provided with a first connecting plate (41), and the fixed end of the telescopic rod (42) is provided with a mounting plate (43), the side surface of the mounting plate (43) and the side surface of the printer body (1) Correspondingly arranged screw holes are provided, and fixing bolts (44) are threadedly connected inside the screw holes. 4. A printing press with automatic paper feeding and paper picking capable of reducing dust pollution according to claim 1, characterized in that: the lifting frame (5) comprises a fixing plate (51), and the fixing plate ( 51) It is fixedly connected to the side surface of the linear motor (32), and the lower surface of the fixing plate (51) is provided with two symmetrically arranged first electric telescopic rods (52), and the fixing plate (51) is connected to the first electric telescopic rod (51). The fixed end of the rod (52) is connected, the telescopic end of the first electric telescopic rod (52) is provided with a second connecting plate (53), and the input end of the first electric telescopic rod (52) is connected to the switch group (2) The output terminal is electrically connected. 5. A printing press with automatic paper feeding and paper picking capable of reducing dust pollution according to claim 1, characterized in that: the adsorption frame (7) comprises a rectangular box body (71), and the rectangular box The upper surface edge of the body (71) is provided with through holes (72) distributed in a rectangular shape, and the interior of the rectangular box body (71) is provided with a negative pressure pump (73), and the air outlet of the negative pressure pump (73) is provided with a negative pressure pump (73). There is an exhaust pipe (74), the air outlet of the exhaust pipe (74) is located on the lower surface of the rectangular box (71), and the input end of the negative pressure pump (73) is electrically connected to the output end of the switch group (2). connect. 6. A printing press with automatic paper feeding and paper picking capable of reducing dust pollution according to claim 1, characterized in that: the driving device (9) comprises a stepping motor (92), and the stepping The motor (92) is fixedly connected to the side surface of the fixed frame (6) through the fixing seat (91), and the output shaft of the stepping motor (92) is fixedly connected to the left rotating shaft (8) through the coupling (93), step The input end of the inlet motor (92) is electrically connected with the output end of the switch group (2). 7. A printing press with automatic paper feeding and paper pickup capable of reducing dust pollution according to claim 1, characterized in that: the storage device (11) comprises a storage rack (111), and the storage rack (111) 111) is provided with a storage box (112) at the right end of the upper surface, and a collection slot (114) is arranged at the left end of the left surface of the storage rack (111). The left side is provided with rectangular grooves (113). 8. A printing press with automatic paper feeding and paper pickup capable of reducing dust pollution according to claim 7, characterized in that: the lower surface of the storage rack (111) is provided with a pillar (14), the There are at least six pillars (14), and the six pillars (14) are distributed in a rectangular shape on the lower surface of the storage rack (111). 9. A printing press with automatic paper feeding and paper pickup capable of reducing dust pollution according to claim 1, wherein the dust removal device (13) comprises a vacuum cleaner (134), and the vacuum cleaner (134) The feed port is provided with a three-way pipe (133), and the front and rear nozzles of the three-way pipe (133) are provided with a conveying pipe (132), and the conveying pipe (132) is far away from the three-way pipe (132). 133) is provided with a collection funnel (131) at one end, the collection funnel (131) is fixedly connected to the left end of the side surface of the storage rack (111), and the input end of the vacuum cleaner (134) is electrically connected to the output end of the switch group (2) . 10. A printing press with automatic paper feeding and paper picking capable of reducing dust pollution according to claim 1, characterized in that: two symmetrically arranged positioning grooves are provided on the side of the rectangular box body (71). (10), the inner surface of the fixed frame (6) corresponding to the positioning groove (10) is provided with two symmetrically arranged second electric telescopic rods (15), and the fixed frame (6) and the second electric telescopic rods ( 15), the input end of the second electric telescopic rod (15) is electrically connected with the output end of the switch group (2).

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