CN221304090U

CN221304090U - Laboratory bench with rotatable teaching screen

Info

Publication number: CN221304090U
Application number: CN202322526288.3U
Authority: CN
Inventors: 吴鹏
Original assignee: Nantong Industrial And Trade Technician College Nantong Industrial And Trade Senior Technical School
Current assignee: Nantong Industrial And Trade Technician College Nantong Industrial And Trade Senior Technical School
Priority date: 2023-09-18
Filing date: 2023-09-18
Publication date: 2024-07-09
Anticipated expiration: 2033-09-18

Abstract

The utility model discloses an experiment table with a rotatable teaching screen, which comprises a movable supporting frame, a working table surface, an experiment panel and the teaching screen, wherein a connecting bottom plate is arranged above the movable supporting frame, an electric expansion plate is arranged above the connecting bottom plate, the top end of the electric expansion plate is connected with a connecting top plate, a storage cabinet is connected above the connecting top plate, an electric cabinet is arranged behind the storage cabinet, the working table surface is arranged above the storage cabinet, a rotary connecting block is arranged in the center of the working table surface, the experiment panel is arranged above the rotary connecting block, the teaching screen is connected behind the experiment panel, a dustproof baffle is connected above the teaching screen and the experiment panel, meanwhile, the experiment panel and the teaching screen are switched by the rotary connecting block which can rotate, and teaching can be performed through the teaching screen while experiments are performed.

Description

Laboratory bench with rotatable teaching screen

Technical Field

The utility model relates to the technical field of experiment tables, in particular to an experiment table with a rotatable teaching screen.

Background

The electrical and electronic test bed is designed according to the requirements of related teaching experiment outlines such as professional schools, mechanic schools, middle professional schools, electrical skill training, electroengineering and the like, and is modern electrical experiment complete equipment integrating theoretical learning, experiment verification and skill training.

The patent with the application number of CN201810992089.2 is searched to provide a multifunctional electronic and electrical test bed device which has the advantages of simple structure and convenient use, can save space and can improve the teaching quality of teachers and the learning level of students.

Above-mentioned similar scheme, in the in-process of carrying out experimental teaching, although its convenient to use, both can practice thrift the space, can improve mr's teaching quality and student's learning level again, but its video teaching district and test area show in one side simultaneously, then its test bench's occupation of land space is too big, and its video teaching district and test area are in same side, can lead to the in-process of teaching to shelter from the student's sight of one side wherein, can not accomplish the teaching content of watching that makes every student all can be clear, and it does not set up the raising and lowering functions, the height of experiment is too low, can be unfavorable for the student to watch video teaching district.

Therefore, in view of the above-mentioned problems, an experiment table with a rotatable teaching screen is proposed to achieve the purpose of more practical value.

Disclosure of utility model

The utility model aims to provide a test bed with a rotatable teaching screen, which solves the problems that in the background, a video teaching area and a test area of the multifunctional electronic and electric test bed are displayed on one side at the same time, so that the occupied space of the test bed is overlarge, the video teaching area and the test area are on the same side, the vision of students on one side is blocked in the teaching process, the students can not clearly watch teaching contents, a lifting function is not arranged, the experiment height is too low, and the video teaching area is not easily watched by the students.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an experiment table with rotatable teaching screen, includes and removes support frame, table surface, experiment panel and teaching screen, and the top of removing the support frame is provided with connecting plate, connecting plate's top is provided with electric expansion plate, electric expansion plate's top is connected with the connection roof, just electric expansion plate all is provided with corresponding connecting hole with the connection roof, just electric expansion plate passes through bolted connection with the connection roof through connecting hole, connecting plate's top is connected with the locker, just the rear of locker is provided with the regulator cubicle, table surface sets up in the top of locker, table surface's central point puts and is provided with rotatory connecting block, the experiment panel sets up the top at rotatory connecting block, teaching screen connects at experiment panel's rear, just teaching screen and experiment panel's top is connected with dust baffle.

Preferably, the movable support frame comprises a telescopic side plate and a movable bottom frame, wherein the telescopic side plate is connected to two sides above the movable bottom frame, four groups of universal wheels which are symmetrical in pairs are arranged at the bottom of the movable bottom frame, the support frame is arranged at the center of the movable bottom frame, four groups of second fixing press blocks are symmetrically arranged on two sides of the connecting bottom plate, and the connecting bottom plate is connected with the movable bottom frame through bolts through the second fixing press blocks.

Preferably, the telescopic side plate comprises a connecting plate and a movable plate, the connecting plate is connected with the movable plate through a telescopic rod, a connecting chute is arranged on one side, close to the supporting frame, of the movable plate, and a sliding rail is arranged on the inner side of the connecting chute.

Preferably, the inside connection of connecting the spout has the removal slider, just remove the slider and pass through slip track and connecting the spout sliding connection, the top of connecting the spout is provided with first fixed briquetting, just all be provided with No. two connecting holes on first fixed briquetting and the removal slider, connect the top at the support frame of bottom plate connection, just table surface connects between fixed briquetting and removal slider, first fixed briquetting and removal slider pass through No. two connecting holes and table surface bolted connection.

Preferably, the central position of table surface is provided with the spread groove, just rotatory connecting block is pegged graft in table surface through the spread groove, rotatory connecting block includes central rotation axis and coupling housing, central rotation axis is the hollow shaft, just the outside symmetry of central rotation axis is provided with two sets of connecting rods, just central rotation axis passes through the connecting rod and is connected with coupling housing, two sets of the outside of connecting rod all is provided with a set of gag lever post, and two sets of the gag lever post uses a diameter of central rotation axis to set up as the symmetry axis, coupling housing's top symmetry is provided with two sets of spread grooves.

Preferably, the junction of rotatory connecting block and experimental panel and teaching screen is provided with rotatory connecting plate, just rotatory connecting block passes through rotatory connecting plate with experimental panel and teaching screen and is connected, rotatory connecting plate's bottom is provided with two sets of connection inserts, rotatory connecting plate's top outside is provided with the baffle, rotatory connecting plate's top still is provided with the baffle lug, be provided with a line hole on the baffle lug, just baffle and baffle lug enclose into No. three spread grooves and No. four spread grooves.

Preferably, the experiment panel is inserted in the fourth connecting groove, the teaching screen is inserted in the third connecting groove, the rotary connecting plate is inserted in the second connecting groove of the rotary connecting block through the connecting plug, the center position of the first connecting groove is provided with a second wire hole, the electric cabinet is not provided with a top plate, and the second wire hole is connected with the top of the electric cabinet.

Compared with the prior art, set up experimental panel and teaching screen simultaneously, and still be provided with rotatory connecting block that can rotate and switch experimental panel and teaching screen, can be in the experiment teaching through the teaching screen, its concrete content is as follows:

When teaching, the rotary connecting block drives the rotary connecting plate and the experimental panel and the teaching screen above the rotary connecting plate to rotate, the rotary connecting block drives the connecting rod and the connecting shell connected with the rotary connecting plate to rotate by the central rotary shaft, and the limiting rod can only rotate in a degree, so that the rotary connecting block can be prevented from continuously rotating to cause the damage of the connecting wire inside, the experiment or the equipment of teaching content to be performed is turned to the side facing the student, the whole teaching device consisting of the teaching screen, the experimental panel, the storage cabinet and the electric cabinet can be lifted, the electric expansion plate drives the connecting top plate and the working table above the connecting top plate to ascend or descend, and the movable plate on the expansion side plate is driven by the working table to ascend or descend through the expansion rod, so that the height of the teaching device is adjusted.

Drawings

FIG. 1 is a schematic diagram of the front of a main body of a laboratory bench with a rotatable teaching screen according to the present utility model;

FIG. 2 is a schematic view of the back of the body of a laboratory bench with a rotatable teaching screen according to the present utility model;

FIG. 3 is a schematic side view of a main body of a laboratory bench with a rotatable teaching screen according to the present utility model;

FIG. 4 is a schematic view of the structure of the main body of the movable support frame of the laboratory bench with a rotatable teaching screen according to the present utility model;

FIG. 5 is a schematic side view of a teaching test stand with rotatable teaching screen according to the present utility model;

FIG. 6 is a schematic side view of a rotary connection block of a laboratory bench with a rotatable teaching screen according to the present utility model;

FIG. 7 is a schematic top view of a rotary connection block of a laboratory bench with a rotatable teaching screen according to the present utility model;

FIG. 8 is a schematic side view of a rotatable connection plate of a laboratory bench with a rotatable teaching screen according to the present utility model;

Fig. 9 is a schematic top view of a rotary connection board of a laboratory bench with a rotatable teaching screen according to the present utility model.

In the figure: 1. moving the support frame; 11. a telescopic side plate; 111. a connecting plate; 112. a telescopic rod; 113. a moving plate; 114. the connecting chute; 115. a first fixed press block; 116. moving the slide block; 117. a second connecting hole; 12. a universal wheel; 13. a moving chassis; 2. a connecting bottom plate; 21. an electric expansion plate; 22. connecting a top plate; 23. a first connecting hole; 24. a second fixed pressing block; 3. a storage cabinet; 4. a work table; 41. a first connecting groove; 42. a second wire hole; 5. rotating the connecting block; 51. a center rotation shaft; 52. a connection housing; 53. a second connecting groove; 54. rotating the connecting plate; 541. a baffle; 542. connecting the plug blocks; 543. baffle plate protruding blocks; 544. a first wire hole; 545. a third connecting groove; 546. a fourth connecting groove; 55. a connecting rod; 56. a limit rod; 6. an experiment panel; 7. a dust-proof baffle; 8. a teaching screen; 9. an electrical cabinet.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 9, the present utility model provides a technical solution: the utility model provides an experiment table with rotatable teaching screen, including moving support frame 1, table surface 4, experiment panel 6 and teaching screen 8, the top of moving support frame 1 is provided with connecting plate 2, the top of connecting plate 2 is provided with electric expansion plate 21, electric expansion plate 21's top is connected with connecting plate 22, and electric expansion plate 21 and connecting plate 22 all are provided with corresponding connecting hole 23, and electric expansion plate 21 passes through connecting plate 2 and passes through connecting hole 23 and passes through bolted connection, the top of connecting plate 22 is connected with locker 3, and the rear of locker 3 is provided with regulator cubicle 9, table surface 4 sets up the top at locker 3, the central point of table surface 4 is put and is provided with rotatory connecting block 5, experiment panel 6 sets up the top at rotatory connecting block 5, teaching screen 8 is connected at the rear of experiment panel 6, the dustproof baffle 7 is connected above the teaching screen 8 and the experiment panel 6, the storage cabinet 3 is used for placing teaching files and experimental tools for experiments, some connecting wires and connecting power supplies of the teaching screen 8 and the experiment panel 6 are placed in the electrical cabinet 9, the cabinet doors are arranged on the storage cabinet 3 and the electrical cabinet 9, the electrical cabinet 9 is a downward cabinet door, the connection circuit and the maintenance of the circuit are convenient, the teaching screen 8 is used for playing teaching videos and courseware, the experiment panel 6 is used for demonstrating the experiments of the electrotechnics, the dustproof baffle 7 is used for preventing dust or other sundries falling from the upper side from affecting the use of the teaching screen 8 and the experiment panel 6, the electric expansion plate 21 and the connecting top plate 22 are fixedly connected through bolts and inserted into the first connecting hole 23, the electric expansion plate 21 is prevented from driving the connecting top plate 22 to ascend to shake, and the electric expansion plate 21 is convenient to disassemble and maintain when the electric expansion plate 21 breaks down, the electric expansion plate 21 drives the connecting top plate 22 and the locker 3 and the electrical cabinet 9 which are connected above the connecting top plate to ascend or descend, and simultaneously drives the working table 4 on the locker 3 and the electrical cabinet 9 and the teaching screen 8 and the experimental panel 6 above the working table 4 to ascend or descend.

The movable support frame 1 comprises a telescopic side plate 11 and a movable bottom frame 13, the telescopic side plate 11 is connected to two sides above the movable bottom frame 13, four groups of universal wheels 12 which are symmetrical to each other are arranged at the bottom of the movable bottom frame 13, a support frame 131 is arranged at the center of the movable bottom frame 13, the connecting bottom plate 2 is connected to the upper side of the support frame 131, four groups of second fixed pressing blocks 24 are symmetrically arranged on two sides of the connecting bottom plate 2, the connecting bottom plate 2 is connected with the movable bottom frame 13 through the second fixed pressing blocks 24, a teaching device consisting of a teaching screen 8, an experiment panel 6, a storage cabinet 3 and an electrical cabinet 9 is connected with the movable support frame 1 through a lifting function device consisting of an electric telescopic plate 21, a connecting top plate 22 and the connecting bottom plate 2, and the lifting function device consisting of the electric telescopic plate 21, the connecting top plate 22 and the connecting bottom plate 2 are connected with the movable bottom frame 13 through the connecting bottom plate 2 and the four groups of second fixed pressing blocks 24 at the bottom, the whole experiment table is convenient to move through the universal wheels 12 at the bottom of the movable support frame 1, and the experiment table can be conveniently moved, and parts of the connecting bottom plate 2, the movable bottom frame 13 and the movable bottom frame can be conveniently replaced.

The telescopic side plate 11 comprises a connecting plate 111 and a moving plate 113, the connecting plate 111 is connected with the moving plate 113 through a telescopic rod 112, one side, close to a supporting frame 131, of the moving plate 113 is provided with a connecting chute 114, a sliding rail 118 is arranged on the inner side of the connecting chute 114, a moving slide block 116 is connected with the connecting chute 114 in a sliding manner through the sliding rail 118, a first fixed pressing block 115 is arranged above the connecting chute 114, the first fixed pressing block 115 and the moving slide block 116 are both provided with a second connecting hole 117, the working table 4 is connected between the first fixed pressing block 115 and the moving slide block 116, the first fixed pressing block 115 and the moving slide block 116 are connected with the working table 4 through the second connecting hole 117 through bolts, the working table 4 is placed below the first fixed pressing block 115, then the moving slide block 116 slides in the connecting chute 114, the top surface of the moving slide block 116 is tightly attached to the bottom surface of the working table 4, then the first fixed pressing block 115 and the moving slide block 116 are connected with the working table 4 through the second connecting hole 117 through bolts, the first fixed pressing block 115 and the second connecting hole 117 are prevented from moving the working table 4, the electric face plate 8 moving in the moving support frame 1 is prevented from moving up, the working table 4 is driven by the telescopic plate or the telescopic plate 11 to move up and down through the telescopic plate 11, and the telescopic plate is driven by the telescopic plate 11 is driven to move up and down by the telescopic plate 11 is driven by the telescopic plate 11.

The central point of table surface 4 puts and is provided with connecting groove 41 No. one, and rotatory connecting block 5 peg graft in table surface 4 through connecting groove 41 No. one, rotatory connecting block 5 includes central rotation axis 51 and coupling housing 52, central rotation axis 51 is the hollow shaft, and the outside symmetry of central rotation axis 51 is provided with two sets of connecting rods 55, and central rotation axis 51 passes through connecting rod 55 and coupling housing 52 to be connected, the outside of two sets of connecting rods 55 all is provided with a set of gag lever post 56, and two sets of gag lever posts 56 use a diameter of central rotation axis 51 to set up as the symmetry axis, the top symmetry of coupling housing 52 is provided with two sets of No. two connecting grooves 53, rotatory connecting block 5 is rotated by central rotation axis 51 drive connecting rod 55 and coupling housing 52 that connects thereof, and because gag lever post 56 can only carry out 180 degrees rotations, can prevent like this that rotatory connecting block 5 from rotating in succession and leading to inside connecting wire to damaging.

The rotary connecting block 5 is connected with the experimental panel 6 and the teaching screen 8 through the rotary connecting plate 54, two groups of connecting plug blocks 542 are arranged at the bottom of the rotary connecting plate 54, a baffle 541 is arranged on the outer side above the rotary connecting plate 54, a baffle lug 543 is further arranged above the rotary connecting plate 54, a first wire hole 544 is formed in the baffle lug 543, the baffle 541 and the baffle lug 543 enclose a third connecting groove 545 and a fourth connecting groove 546, the experimental panel 6 is inserted in the fourth connecting groove 546, the teaching screen 8 is inserted in the third connecting groove 545, the rotary connecting plate 54 is inserted into a second connecting groove 53 of the rotary connecting block 5 through the connecting plug blocks 542, a second wire hole 42 is arranged at the central position of the first connecting groove 41, no top plate is arranged on the electrical cabinet 9, the second wire hole 42 is connected with the top of the electrical cabinet 9, the experimental panel 6 and the teaching screen 8 are connected with the rotary connecting plate 5 through the rotary connecting plate 54, and the experimental connecting plate 6 and the teaching screen 8 above the rotary connecting plate 54 are driven by the rotary 5 to rotate the experimental connecting plate 6 and the teaching screen 8;

And experimental panel 6 and teaching screen 8 switch the teaching scene through the rotation, baffle 541 and baffle lug 543 are used for fixed experimental panel 6 and teaching screen 8, prevent that experimental panel 6 and teaching screen 8 from dropping at rotatory in-process, experimental panel 6 and the inside data connecting wire of teaching screen 8 and power connecting wire reach central rotation axis 51 department through a line hole 544 on the baffle lug 543, reach No. two line holes 42 of the central department of a spread groove 41 from the central rotation axis 51 again, then reach in the regulator cubicle 9 through No. two line holes 42, with each power or internet access in the regulator cubicle.

Working principle: firstly, the connecting bottom plate 2 is connected with the movable underframe 13 through the second fixed pressing block 24 through bolts, then the electric expansion plate 21 is inserted into the connecting top plate 22, then the electric expansion plate 21 and the connecting top plate 22 are fixedly connected through bolts into the first connecting hole 23, at the moment, the working table top 4 is connected between the first fixed pressing block 115 and the movable sliding block 116, the working table top 4 is placed below the first fixed pressing block 115, then the movable sliding block 116 slides in the connecting sliding groove 114, the top surface of the movable sliding block 116 is tightly attached to the bottom surface of the working table top 4, then the first fixed pressing block 115 and the movable sliding block 116 are connected with the working table top 4 through the second connecting hole 117 through bolts, the working table top 4 is fixed, then the rotary connecting block 5 is inserted into the working table top 4 through the first connecting groove 41, then the rotary connecting plate 54 is inserted into the second connecting groove 53 of the rotary connecting block 5 through the connecting plug 542, then the experimental panel 6 is inserted into the fourth connecting groove 546, and the teaching screen 8 is inserted into the third connecting groove 545, and therefore the installation of the experimental table can be completed.

After the installation is finished, the universal wheel 12 at the bottom of the whole experiment table can move through the movable supporting frame 1, and the first fixed pressing block 115 and the movable sliding block 116 are connected with the working table 4 through the second connecting hole 117 in a bolt manner, so that the working table 4 is fixed, the teaching screen 8 and the experiment panel 6 on the working table 4 in the moving process of the movable supporting frame 1 are prevented from shaking, and the baffle 541 and the baffle lug 543 can fix the experiment panel 6 and the teaching screen 8, so that the experiment panel 6 and the teaching screen 8 are prevented from falling in the moving process.

After the experiment table is moved to the appointed teaching position, the data connecting line and the power connecting line inside the experiment panel 6 and the teaching screen 8 can reach the center rotating shaft 51 through a first line hole 544 on the baffle lug 543, then reach a second line hole 42 at the center of the first connecting groove 41 from the center rotating shaft 51, then reach the electric cabinet 9 through the second line hole 42, be connected with various power supplies or networks in the electric cabinet, and the electric cabinet 9 is a downward turning cabinet door, so that the electric circuit is conveniently connected and the electric circuit is maintained.

The circuit and the data line are connected, teaching work can be performed, the teaching screen 8 is used for playing teaching videos and courseware, the experiment panel 6 is used for demonstrating experiments of electronic electricians, teaching files and experimental tools for some experiments can be placed in the storage cabinet 3, when teaching is performed, the rotary connecting plate 54 and the experiment panel 6 and the teaching screen 8 above the rotary connecting plate are driven by the rotary connecting plate 5 to rotate through the rotary connecting plate 5, the connecting rod 55 and the connecting shell 52 connected with the rotary connecting plate are driven by the central rotary shaft 51 to rotate, and the limiting rod 56 can only rotate 180 degrees, so that the rotary connecting plate 5 can be prevented from continuously rotating to cause damage to the connecting wire inside, the experiment to be performed or the equipment of teaching contents is turned to face one side of a student, the whole teaching device consisting of the teaching screen 8, the experiment panel 6 and the storage cabinet 3 is lifted, the electric cabinet 9 is driven by the electric telescopic plate 21 to lift or descend through the telescopic plate 112, and the movable plate 113 on the telescopic plate 11 is driven by the workbench 4 to lift or descend through the telescopic rod 112, and therefore the height of the teaching device is adjusted.

Claims

1. Laboratory bench with rotatable teaching screen, including removing support frame (1), table surface (4), experimental panel (6) and teaching screen (8), its characterized in that: the top of removing support frame (1) is provided with connecting plate (2), the top of connecting plate (2) is provided with electric expansion plate (21), the top of electric expansion plate (21) is connected with connecting roof (22), just electric expansion plate (21) all are provided with corresponding connecting hole (23) No. one with connecting roof (22), just electric expansion plate (21) and connecting roof (22) pass through bolted connection through connecting hole (23), the top of connecting roof (22) is connected with locker (3), just the rear of locker (3) is provided with regulator cubicle (9), table surface (4) set up the top at locker (3), the central point of table surface (4) is provided with rotatory connecting block (5), experiment panel (6) set up the top at rotatory connecting block (5), teaching screen (8) are connected at the rear of experiment panel (6), just teaching screen (8) and experiment panel (6) top are connected with dustproof baffle (7).

2. A laboratory bench with rotatable teaching screen according to claim 1, characterized in that: the movable supporting frame (1) comprises a telescopic side plate (11) and a movable bottom frame (13), the telescopic side plate (11) is connected to two sides above the movable bottom frame (13), four groups of universal wheels (12) which are symmetrical in pairs are arranged at the bottom of the movable bottom frame (13), a supporting frame (131) is arranged at the center position of the movable bottom frame (13), the connecting bottom plate (2) is connected to the upper side of the supporting frame (131), four groups of second fixing pressing blocks (24) are symmetrically arranged on two sides of the connecting bottom plate (2), and the connecting bottom plate (2) is connected with the movable bottom frame (13) through bolts through the second fixing pressing blocks (24).

3. A laboratory bench with rotatable teaching screen according to claim 2, characterized in that: the telescopic side plate (11) comprises a connecting plate (111) and a movable plate (113), the connecting plate (111) is connected with the movable plate (113) through a telescopic rod (112), a connecting chute (114) is arranged on one side, close to a supporting frame (131), of the movable plate (113), and a sliding rail (118) is arranged on the inner side of the connecting chute (114).

4. A laboratory bench with rotatable teaching screen according to claim 3, characterized in that: the inside of connecting chute (114) is connected with and removes slider (116), just remove slider (116) through slip track (118) and connecting chute (114) sliding connection, the top of connecting chute (114) is provided with first fixed briquetting (115), just all be provided with No. two connecting holes (117) on first fixed briquetting (115) and the removal slider (116), just table surface (4) are connected between first fixed briquetting (115) and removal slider (116), first fixed briquetting (115) and removal slider (116) are through No. two connecting holes (117) and table surface (4) bolted connection.

5. A laboratory bench with rotatable teaching screen according to claim 1, characterized in that: the center position of table surface (4) is provided with spread groove (41), just rotatory connecting block (5) peg graft in table surface (4) through spread groove (41), rotatory connecting block (5) are including central rotation axis (51) and coupling shell (52), central rotation axis (51) are the hollow shaft, just the outside symmetry of central rotation axis (51) is provided with two sets of connecting rods (55), just central rotation axis (51) are connected with coupling shell (52) through connecting rod (55), two sets of the outside of connecting rod (55) all is provided with a set of gag lever post (56), and two sets of gag lever post (56) use a diameter of central rotation axis (51) to set up as the symmetry axis, the top symmetry of coupling shell (52) is provided with two sets of spread grooves (53).

6. A laboratory bench with rotatable teaching screen according to claim 5 and wherein: the utility model discloses a rotatory connecting block, including rotatory connecting block (5), rotatory connecting block (541) are provided with rotatory connecting plate (54) with the junction of experimental panel (6) and teaching screen (8), just rotatory connecting block (5) are connected through rotatory connecting plate (54) with experimental panel (6) and teaching screen (8), the bottom of rotatory connecting plate (54) is provided with two sets of connection inserts (542), the top outside of rotatory connecting plate (54) is provided with baffle (541), the top of rotatory connecting plate (54) still is provided with baffle lug (543), be provided with line hole (544) on baffle lug (543), just baffle (541) and baffle lug (543) enclose into No. three spread groove (545) and No. four spread groove (546).

7. A laboratory bench with rotatable teaching screen according to claim 6 and wherein: the experimental panel (6) is inserted in a fourth connecting groove (546), the teaching screen (8) is inserted in a third connecting groove (545), the rotary connecting plate (54) is inserted in a second connecting groove (53) of the rotary connecting block (5) through a connecting inserting block (542), a second wire hole (42) is formed in the center of the first connecting groove (41), the electrical cabinet (9) is not provided with a top plate, and the second wire hole (42) is connected with the top of the electrical cabinet (9).