CN113108820B - A environmental quality test analysis platform for teaching - Google Patents

Abstract

An environmental quality test and analysis table used for teaching, the upper side of the bottom box is provided with a lifting table that can be lifted and rotated intermittently, the bottom of the bottom box is rotatably connected with a ratchet gear, and the front side of the bottom box is mounted with a repeatable up and down When the pedal swings up and down, it can form a structure in which the ratchet gear rotates in one direction. When the ratchet gear rotates in one direction, it can form a structure in which the platform rotates intermittently. The front side of the ratchet gear is installed with a reversing frame that can swing back and forth. When the ratchet gear rotates in one direction, by controlling the reversing frame to swing back and forth, the placing table can be controlled to stop rotating and go up and down; by repeatedly stepping on the pedal to control the pedal to swing back and forth, the placing table can be driven to rotate intermittently, and the designated specimens and testing supplies can be moved. Move to the front side of the placing table, which is convenient for specimen detection and teaching; if you need to adjust the height of the placing table, you can control the commutator frame to swing back and forth while stepping on the pedal, so as to realize the lifting and lowering of the placing table. control.

Description

An environmental quality test and analysis bench for teaching

technical field

The invention relates to the field of teaching equipment, in particular to an environmental quality test and analysis table used for teaching.

Background technique

Environmental quality monitoring is a kind of environmental monitoring content. It mainly monitors the distribution and concentration of pollutants in the environment to determine the environmental quality status. The historical data of environmental quality monitoring at regular and fixed points can provide essential information for environmental quality assessment and environmental impact assessment. It can accurately, timely and comprehensively reflect the current situation and development trend of environmental quality, and provide scientific basis for environmental management, pollution source control, environmental planning, etc. The content of environmental monitoring mainly includes monitoring air quality, water quality, soil quality, etc. Testing, at present, when teaching for environmental quality testing, the specimen is mainly placed on the surface of the analysis table for teaching, but the current teaching analysis table has a simple structure and relatively simple functions, and it is not convenient to adjust according to the needs of use. There are many kinds of specimens that need to be tested and the steps are cumbersome. When teaching, it is easy to cause the table top to be cluttered and affect the teaching, and it is easy to affect the quality of teaching. In the process of testing, it is easy to accidentally cause the specimen or instrument to fall, which is not conducive to the smooth development of teaching.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the present invention provides an environmental quality test and analysis platform for teaching, which is convenient for arranging and dividing the placement area of the placing platform, fully avoiding the clutter of items, and is convenient to operate and has various functions, and effectively solves the above-mentioned problems. Problems mentioned in the background art.

The technical scheme adopted by the present invention for solving the above problems is:

An environmental quality test and analysis table for teaching, comprising a bottom box, a liftable and intermittently rotating placing table is installed on the upper side of the bottom box, and the lifting and intermittent rotation of the placing table can be carried out separately; The bottom of the bottom box is rotatably connected with a ratchet gear, and the front side of the bottom box is installed with a pedal that can swing up and down repeatedly. When the pedal swings up and down, the ratchet gear can rotate in one direction. When the ratchet gear rotates in one direction, it can form a structure of intermittent rotation of the placing table. The front side of the ratchet gear is installed with a commutator frame that can swing back and forth, and the lower end of the commutator frame is hinged with the inner wall of the bottom box. When the ratchet gear rotates in one direction, the placing table can be controlled to stop rotating and lift up and down by controlling the forward and backward swing of the commutator frame; a mounting column is fixedly connected to the middle part of the upper end of the placing platform, and the upper and lower sides of the surface of the mounting column are fixed. The two connecting pipes are respectively rotated and connected with synchronously rotating connecting pipes, the rotation directions of the two connecting pipes are opposite, and the surfaces of the two connecting pipes are respectively evenly and fixedly connected with a plurality of connecting plates, and the connecting plates on the upper and lower sides are respectively Alternately distributed, the outer ends of the connecting plates on the upper and lower sides are respectively fixed and connected with a second isolation plate and a first isolation plate in sequence; a placing plate is installed on the upper side of the placing table.

Preferably, an upper connecting bevel gear and a lower connecting bevel gear are fixedly connected to the surfaces of the connecting pipes on the upper and lower sides respectively, and a reversing bevel gear is meshed between the upper connecting bevel gear and the lower connecting bevel gear. The reversing bevel gear is rotatably connected to the surface of the installation column, the upper end of the installation column is fixedly connected to the limit gear, and the upper ends of the connecting plate on the upper side are respectively slidably connected to the limit block, and the limit block The inner ends of the restraining gears are respectively meshed with the limiting gears, the outer ends of the limiting tooth blocks are respectively fixedly connected with the limiting springs, and the outer ends of the limiting springs are respectively fixedly connected with the connecting plates.

Preferably, a protective cover is fixedly connected to the upper end of the bottom box, a guide cylinder is rotatably connected to the upper end of the protective cover, the lower surface of the guide cylinder is located inside the protective cover, and the lower end of the guide cylinder is fixedly connected There is a transmission worm gear, the rear side of the transmission worm gear is engaged with a transmission worm, and the transmission worm is rotatably connected with the inner wall of the protective cover; a matching tube that can move up and down is installed inside the guide cylinder, and the interior of the guide cylinder is provided with There is a spiral guide groove, a first matching pin is rotatably connected to the underside of the surface of the matching tube, the other end of the first matching pin is engaged with the lower side of the spiral guide groove, and the upper end of the matching tube is fixed A stabilizing plate is connected, the upper end of the stabilizing plate is rotatably connected with the bottom of the placing table, a telescopic rod is fixedly connected at the non-circle center of the lower end of the stabilizing plate, and the lower end of the telescopic rod is fixedly connected with the surface of the protective cover; The inner part of the matching pipe is rotatably connected with an inner transmission pipe, the upper surface of the inner transmission pipe is rotatably connected with the middle part of the stabilization plate, the upper end of the inner transmission pipe is fixedly connected with the bottom of the placing table, and the inner The inside of the transmission pipe is slidably connected with an inner transmission shaft that can rotate intermittently. When the inner transmission shaft rotates intermittently, the inner transmission pipe can be driven to rotate synchronously and the inner transmission pipe can move up and down on the surface of the inner transmission shaft. The lower end of the inner drive shaft is fixedly connected with a sheave, the sheave is rotatably connected with the inner wall of the bottom box, the front side of the sheave is engaged with an active dial, and the upper end of the sheave is connected with An installation plate, the other end of the installation plate is rotatably connected with the driving dial, and when the ratchet gear rotates, the driving dial can be driven to rotate.

Preferably, the lower end of the active dial is coaxially fixed with a matching shaft, the surface of the matching shaft is slidably connected with an upper connecting claw that can move up and down, and a lower connecting claw is engaged with the lower side of the upper connecting claw. The lower side of the lower connecting claw is fixedly connected with a first driven pulley, the lower end of the first driven pulley is rotatably connected with the inner wall of the bottom box, and the lower ends of the ratchet gears are respectively fixed coaxially. Two driving pulleys are connected, the surfaces of the driving pulleys on the upper and lower sides are respectively covered with a first main transmission belt and a second main transmission belt, and the other end of the first main transmission belt is connected to the first driven pulley. Surface socketing.

Preferably, the upper end of the upper connecting claw is rotatably connected with a link plate, the other end of the link plate is fixedly connected with a piston rod, the upper side of the piston rod is provided with a piston cylinder, and the upper end of the piston rod is fixed A piston plate is connected, the piston plate is slidably connected inside the piston cylinder, a return spring is fixedly connected to the upper end of the piston plate, and the upper end of the return spring is fixedly connected with the inner upper end of the piston cylinder; the The surface of the piston cylinder is provided with a rectangular chute, the left side of the surface of the piston cylinder is slidably connected with a mounting block, the mounting block is fixedly connected with the piston plate, and the left end of the mounting block is rotatably connected with a second matching pin shaft , the left side of the piston cylinder is provided with a push plate that can move back and forth, the surface of the push plate is provided with a V-shaped push groove, the second matching pin is located at the bottom of the push groove and the first Two mating pins are slidably connected to the inner wall of the push groove; a fixing frame is fixedly connected to the surface of the piston cylinder, the front end of the fixing frame is fixedly connected to the inner wall of the protective cover, and the upper and lower ends of the push plate slide respectively A guide rod is connected, and both ends of the guide rod are respectively fixedly connected with the fixing frame;

The right end of the fixing frame is slidably connected with a stabilization shaft, and the lower end of the stabilization shaft is fixedly connected with the surface of the linkage plate.

Preferably, the commutator frame has a V-shaped structure, the front and rear sides of the upper right end of the commutator frame are respectively rotatably connected with meshing gears that can rotate synchronously, the rotation directions of the two meshing gears are opposite, and the two A meshable matching gear is arranged between the meshing gears, and the matching gear is fixedly connected with the left end of the transmission worm; the front end of the commutator frame is hinged with a pull rod, and the front end of the pull rod is connected to the rear end of the push plate. hinged; an operating rod is fixedly connected to the right end of the commutator frame, a rectangular movable port is opened on the surface of the protective cover corresponding to the upper end of the operating rod, and the operating rod extends through the rectangular movable port to the On the upper side of the protective cover, an operating handle is fixedly connected to the left side of the upper end of the operating rod.

Preferably, the upper side of the commutator frame and the left ends corresponding to the two meshing gears are respectively rotatably connected with first transmission pulleys, and the two first transmission pulleys are respectively coaxially fixed with the corresponding meshing gears, The lower sides of the two first drive pulleys are respectively provided with second drive pulleys, the two second drive pulleys are respectively rotatably connected to the left end of the commutator frame, and the surfaces of the first drive pulleys are respectively covered with a second drive pulley. Three transmission belts, the lower ends of the third transmission belt are respectively sleeved with the surfaces of the second transmission pulleys, and the surfaces corresponding to the two second transmission pulleys at the right end of the commutator frame are respectively connected with opposite gears in rotation, and the two The opposite gears are respectively coaxially fixed with the corresponding second transmission pulleys, the two opposite gears are meshed with each other, the left end of the second transmission pulley on the front side is fixedly connected with a transmission gear, and the lower part of the transmission gear A drive gear that can rotate synchronously with the ratchet gear is engaged on the side, the drive gear is coaxially rotatably connected with the lower end of the commutator frame, and the left end of the drive gear is fixedly connected with a second transmission bevel gear, The lower side of the second transmission bevel gear is meshed with a first transmission bevel gear, the first transmission bevel gear is rotatably connected to the inner bottom end of the bottom box, and the lower side of the first transmission bevel gear is fixed coaxially A second driven pulley is connected, the surface of the second driven pulley is sleeved with a second driving belt, and the other end of the second driving belt is sleeved with the surface of the driving pulley on the lower side.

Preferably, the front end of the bottom box is fixedly connected with a sub-board, the front end of the pedal is hinged on the front side of the sub-board, the rear end of the pedal is inclined upward and is hinged with a push plate, and the other side of the push plate is hinged. One end is hinged with a push slide, the push slide is slidably connected to the bottom end of the bottom box, the upper end of the push slide is hinged with two push hinge rods, and the other ends of the two push hinge rods are inclined to the outside and hinged respectively. There are interlocking hinge rods, and the two interlocking hinge rods are respectively rotatably connected with the middle part of the upper end of the ratchet gear; the left and right sides of the ratchet gear are respectively engaged with a pushing pawl and a pulling pawl, and the pushing pawl is The front ends of the pawl and the pulling pawl are respectively coaxially hinged with the hinge points of the linking hinge rod and the pushing hinge rod, and the upper ends of the pushing pawl and the pulling pawl are respectively fixed and connected to the tension spring, and the two The other end of the tension spring is respectively fixedly connected with the surface of the corresponding interlocking hinge rod; the bottom of the push slide plate is fixedly connected with an installation slider, and the bottom of the bottom box is provided with an installation chute, and the installation slider is connected to the bottom of the bottom box. The installation chute is slidably connected, the rear end of the installation slider is fixedly connected with a push spring, the rear end of the push spring is fixedly connected with the inner wall of the installation chute, and a spring shaft is arranged inside the push spring, The surface of the spring shaft is slidably connected with the surface of the installation slider, and both ends of the spring shaft are respectively fixedly connected to the inner wall of the installation chute.

The present invention has novel structure, ingenious design, simple and convenient operation, and has the following advantages compared with the prior art:

When using this device, different specimens and detection items can be classified and placed in the area divided by the first isolation plate and the second isolation plate, so as to avoid the confusion of the objects to be detected during the detection, and place the objects in a disorderly manner, which is convenient for users use; and by rotating the first isolation plate, the second isolation plate can be driven to rotate in the opposite direction synchronously, which is convenient for dividing the area of the placing table according to the needs of the user, and convenient for adjustment; when the pedal is controlled by repeatedly stepping on the pedal It can drive the placing table to rotate intermittently, and move the designated specimen and testing supplies to the front side of the placing table, which is convenient for testing the specimen and facilitating teaching; if you need to adjust the height of the placing table, you can control the commutator frame while stepping on the pedal. By swinging back and forth, the lifting and lowering of the placing table can be controlled, which is convenient for users to operate.

Description of drawings

FIG. 1 is a first schematic diagram of the overall structure of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 2 is a second schematic diagram of the overall structure of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 3 is a schematic structural diagram of a placement table of an environmental quality test and analysis table for teaching according to the present invention.

FIG. 4 is a schematic diagram of the meshing structure of the stop gear and the stop gear block of an environmental quality test and analysis platform used for teaching according to the present invention.

FIG. 5 is a schematic diagram of the installation structure of the first isolation plate and the second isolation plate of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 6 is a schematic diagram of the internal structure of the bottom box of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 7 is a schematic diagram of a fitting pipe installation structure of an environmental quality test and analysis platform for teaching according to the present invention.

8 is a schematic diagram of the internal structure of a guide cylinder of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 9 is a schematic diagram of the installation structure of the inner drive shaft of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 10 is a schematic diagram of the rotating structure of a guide cylinder of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 11 is a schematic diagram of the rotation structure of the inner drive shaft of an environmental quality test and analysis platform for teaching according to the present invention.

12 is a first schematic diagram of a ratchet gear drive structure of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 13 is a schematic diagram of the installation structure of the pushing slide plate of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 14 is a second schematic diagram of the ratchet gear drive structure of an environmental quality test and analysis platform for teaching according to the present invention.

15 is a schematic diagram of the drive structure of the driving pulley of an environmental quality test and analysis platform used for teaching according to the present invention.

FIG. 16 is a schematic diagram of the installation structure of a piston rod of an environmental quality test and analysis platform for teaching according to the present invention.

17 is a schematic diagram of the installation structure of the upper connecting claw of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 18 is a schematic diagram of the installation and drive structure of a commutator frame of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 19 is a schematic diagram of the installation structure of a push plate of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 20 is a schematic diagram of the matching structure of the meshing gear and the matching gear of an environmental quality test and analysis platform for teaching according to the present invention.

FIG. 21 is a schematic diagram of the relative gear installation structure of an environmental quality test and analysis platform for teaching according to the present invention.

Labels in the figure: 1-bottom box, 2-protective cover, 3-placement table, 4-first isolation plate, 5-second isolation plate, 6-placement plate, 7-connection frame, 8-installation column, 9- Limiting gear, 10-limiting gear block, 11-limiting spring, 12-connecting pipe, 13-connecting plate, 14-upper connecting bevel gear, 15-reversing bevel gear, 16-lower connecting bevel gear, 17- Stable plate, 18-inner transmission tube, 19-telescopic rod, 20-guide cylinder, 21-matching tube, 22-inner transmission shaft, 23-first matching pin shaft, 24-spiral guide groove, 25-transmission worm gear, 26 -Transmission worm, 27-matching gear, 28-sheave, 29-drive wheel, 30-installation plate, 31-ratchet gear, 32-push pawl, 33-pull pawl, 34-tension spring, 35-connection Moving hinge rod, 36-push hinge rod, 37-push slide plate, 38-push plate, 39-pedal, 40-install slider, 41-spring shaft, 42-push spring, 43-drive pulley, 44-first Main transmission belt, 45-second main transmission belt, 46-first driven pulley, 47-second driven pulley, 48-first transmission bevel gear, 49-lower connecting claw, 50-upper connecting claw, 51- Matching shaft, 52-linking plate, 53-stabilizing shaft, 54-piston rod, 55-piston plate, 56-piston cylinder, 57-return spring, 58-second matching pin, 59-reversing frame, 60- First drive pulley, 61-second drive pulley, 62-third drive belt, 63-second drive bevel gear, 64-drive gear, 65-drive gear, 66-opposite gear, 67-mesh gear, 68-tie rod, 69-Fixed frame, 70-Guide rod, 71-Push plate, 72-Push slot, 73-Operation rod, 74-Operation handle, 75-Auxiliary push rod, 76-Push handle, 77-Sub-plate.

Detailed ways

The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

As shown in Figures 1-21, the present invention provides an environmental quality test and analysis platform for teaching, comprising a bottom box 1, and a placement table 3 that can be lifted and lowered and can be rotated intermittently is installed on the upper side of the bottom box 1, so The lifting and intermittent rotation of the placing table 3 can be carried out separately; the bottom of the bottom box 1 is rotatably connected with a ratchet gear 31, and the front side of the bottom box 1 is installed with a pedal 39 that can swing up and down repeatedly. When the pedal 39 swings up and down, the ratchet gear 31 can rotate in one direction, and when the ratchet gear 31 rotates in one direction, the placing table 3 can rotate intermittently. A commutator frame 59 that can swing back and forth, the lower end of the commutator frame 59 is hinged with the inner wall of the bottom box 1, when the ratchet gear 31 rotates in one direction, the commutator frame 59 can be controlled by controlling the back and forth swing of the commutator frame 59. The placing table 3 stops rotating and lifts up and down; a mounting column 8 is fixedly connected to the middle of the upper end of the placing table 3, and the upper and lower sides of the surface of the mounting column 8 are respectively connected with connecting pipes 12 that can rotate synchronously. The rotation directions of the connecting pipes 12 are opposite. The surfaces of the two connecting pipes 12 are fixedly connected with a plurality of connecting plates 13 evenly, respectively. The connecting plates 13 on the upper and lower sides are alternately distributed, and the connecting plates 13 on the upper and lower sides A second isolation plate 5 and a first isolation plate 4 are respectively fixedly connected to the outer ends of the placing table 3 in sequence; a placing plate 6 is installed on the upper side of the placing table 3 .

The right side of the surface of the placing plate 6 is fixedly connected with a connecting frame 7, the lower end of the connecting frame 7 is fixedly connected with the upper end of the matching pipe 21, and the placing plate 6 is used to place the items that the user needs to use, which is convenient for backup; the first isolation The plate 4 and the second isolation plate 5 are used to divide the area on the upper end of the placing table 3, which is convenient for the reasonable and full use of the space on the upper end of the placing table 3, and the area on the upper end of the placing table 3 can be classified, which is convenient for users to detect different. Different specimens are classified and placed on the upper end of the placing table 3 when the specimen is placed, so as to avoid the confusion of the items to be detected during the detection, and the placed items are placed in a disorderly manner, which is convenient for the user to use; and by rotating the first isolation plate 4, the second isolation plate can be driven 5. Rotate in the opposite direction synchronously, which is convenient to divide the area of the placing table 3 according to the needs of the user, and is convenient to adjust; when using this device, different specimens and test items can be classified and placed on the first isolation plate 4 and the second. In the area divided by the isolation plate 5, by repeatedly stepping on the pedal 39 to control the pedal 39 to swing back and forth, the placing table 3 can be driven to rotate intermittently, and the designated specimen and testing supplies can be moved to the front side of the placing table 3, which is convenient for the specimen to be tested. Detection and convenient teaching; if the height of the placing table 3 needs to be adjusted, the commutator frame 59 can be controlled to swing back and forth while stepping on the pedal 39, and then the lifting and lowering of the placing table 3 can be controlled, which is convenient for the user to operate.

The surfaces of the connecting pipes 12 on the upper and lower sides are respectively fixedly connected with an upper connecting bevel gear 14 and a lower connecting bevel gear 16, and a reversing bevel is meshed between the upper connecting bevel gear 14 and the lower connecting bevel gear 16. Gear 15, the reversing bevel gear 15 is rotatably connected to the surface of the installation column 8, the upper end of the installation column 8 is fixedly connected to the limit gear 9, and the upper ends of the connecting plate 13 on the upper side are respectively slidably connected to the limit teeth Block 10, the inner ends of the limit tooth blocks 10 are meshed with the limit gear 9 respectively, the outer ends of the limit tooth blocks 10 are respectively fixedly connected to the limit springs 11, and the outer ends of the limit springs 11 are respectively fixed. They are respectively fixedly connected with the connecting plates 13 .

When one of the first isolation plate 4 or the second isolation plate 5 is rotated, the other can be driven in the opposite direction through the transmission and reversal action of the upper connecting bevel gear 14, the lower connecting bevel gear 16 and the reversing bevel gear 15. Rotation is convenient for users to adjust, the limit gear 9 is meshed with the limit gear block 10 to temporarily fix the first isolation plate 4 and the second isolation plate 5, and strengthen the stability of the first isolation plate 4 and the second isolation plate 5 The lower end of the limiting tooth block 10 is fixedly connected with a connecting slider, the upper end of the upper connecting plate 13 is provided with a connecting chute, the connecting slider is slidably connected with the connecting chute, and the limiting spring 11 is located inside the connecting chute, The limiting spring 11 is used to push the limiting tooth block 10 to engage with the limiting gear 9 .

A protective cover 2 is fixedly connected to the upper end of the bottom box 1 , and a guide cylinder 20 is rotatably connected to the upper end of the protective cover 2 . The lower end is fixedly connected with a transmission worm gear 25, the rear side of the transmission worm gear 25 is engaged with a transmission worm 26, and the transmission worm 26 is rotatably connected with the inner wall of the protective cover 2; For the matching tube 21, a spiral guide groove 24 is opened inside the guide cylinder 20. A first matching pin shaft 23 is rotatably connected to the lower surface of the matching tube 21, and the other end of the first matching pin shaft 23 is connected to the The lower side of the helical guide groove 24 is engaged, the upper end of the matching pipe 21 is fixedly connected with a stabilizing plate 17, the upper end of the stabilizing plate 17 is rotatably connected to the bottom of the placing table 3, and the lower end of the stabilizing plate 17 is not at the center of the circle. A telescopic rod 19 is fixedly connected to the bottom of the telescopic rod 19, and the lower end of the telescopic rod 19 is fixedly connected to the surface of the protective cover 2; It is rotatably connected with the middle of the stabilization plate 17, the upper end of the inner transmission pipe 18 is fixedly connected with the bottom of the placing table 3, and the inner transmission pipe 18 is slidably connected with an inner transmission shaft 22 that can rotate intermittently. When the inner transmission shaft 22 rotates intermittently, it can drive the inner transmission pipe 18 to rotate synchronously, and the inner transmission pipe 18 can move up and down on the surface of the inner transmission shaft 22. The lower end of the inner transmission shaft 22 is fixedly connected with a sheave. 28. The sheave 28 is rotatably connected to the inner wall of the bottom box 1. The front side of the sheave 28 is engaged with an active dial 29, and the upper end of the sheave 28 is coaxially connected to a mounting plate 30. The other end of the mounting plate 30 is rotatably connected with the driving dial 29 , and when the ratchet gear 31 rotates, the driving dial 29 can be driven to rotate.

When the active dial 29 is rotated, the sheave 28 can be driven to rotate intermittently by engaging with the sheave 28. The first isolation plate 4 and the second isolation plate 5 have three respectively, and the upper end of the placing table 3 is divided into six areas. The wheel 28 rotates sixty degrees each time, when the sheave 28 rotates once, there can be an area to move to the front side of the placing table 3, when the first isolation plate 4 and the second isolation plate 5 rotate, they can be attached to each other and merge with each other. The placing table 3 is divided into three areas, so that one area can be moved to the front side of the placing table 3 every time the sheave 28 is rotated twice. The two sides corresponding to the surface of the transmission shaft 22 are respectively provided with first limit grooves, and the two sides corresponding to the surface of the inner transmission tube 18 are respectively provided with first limit protrusions. The first limit grooves and the first limit protrusions With sliding fit, the inner transmission tube 18 can be driven to rotate when the inner transmission shaft 22 rotates, and the inner transmission tube 18 can slide on the surface of the inner transmission shaft 22 when the placing table 3 is lifted and lowered, and when the sheave 28 rotates intermittently, it can be The inner transmission tube 18 is driven by the inner transmission shaft 22 to rotate intermittently, and then the placement table 3 can be driven to rotate intermittently. When the inner transmission tube 18 rotates, the matching tube 21 is not affected. Therefore, when the placing table 3 is rotated, the matching tube 21 is not affected; the telescopic rod 19 includes an outer cylinder and an inner shaft, the inner shaft is slidably connected inside the outer cylinder, the bottom of the outer cylinder is fixedly connected with the protective cover 2, and the upper end of the inner shaft is firmly connected to the outer cylinder. The bottom of the plate 17 is fixedly connected, and the stabilizing plate 17 can only move up and down under the restriction of the telescopic rod 19. When the guide cylinder 20 rotates, the first matching pin 23 can be pushed through the spiral guide groove 24 to push the matching pipe 21 to move up and down, and then The lifting and lowering of the placing table 3 is realized.

The lower end of the active dial 29 is coaxially fixed with a matching shaft 51, the surface of the matching shaft 51 is slidably connected with an upper connecting claw 50 that can move up and down, and a lower connecting claw is engaged with the lower side of the upper connecting claw 50. 49, the lower side of the lower connecting claw 49 is fixedly connected with a first driven pulley 46 coaxially, the lower end of the first driven pulley 46 is rotatably connected with the inner wall of the bottom box 1, the ratchet gear The lower ends of 31 are respectively coaxially and fixedly connected with two driving pulleys 43. The surfaces of the driving pulleys 43 on the upper and lower sides are respectively covered with a first main transmission belt 44 and a second main transmission belt 45. The first main transmission belt The other end of 44 is sleeved with the surface of the first driven pulley 46 .

The upper end of the upper connecting claw 50 is rotatably connected with a link plate 52, the other end of the link plate 52 is fixedly connected with a piston rod 54, and the upper side of the piston rod 54 is provided with a piston cylinder 56, the piston rod The upper end of 54 is fixedly connected with a piston plate 55, the piston plate 55 is slidably connected to the inside of the piston cylinder 56, and the upper end of the piston plate 55 is fixedly connected with a return spring 57, and the upper end of the return spring 57 is connected with the The inner upper end of the piston cylinder 56 is fixedly connected; the surface of the piston cylinder 56 is provided with a rectangular chute, the left side of the surface of the piston cylinder 56 is slidably connected with a mounting block, and the mounting block is fixedly connected to the piston plate 55, The left end of the mounting block is rotatably connected with the second matching pin shaft 58, the left side of the piston cylinder 56 is provided with a push plate 71 that can move forward and backward, and the surface of the push plate 71 is provided with a V-shaped push groove 72, The second cooperating pin 58 is located at the bottom of the push groove 72 and the second cooperating pin 58 is slidably connected to the inner wall of the pushing groove 72; the surface of the piston cylinder 56 is fixedly connected with a fixing frame 69, The front end of the fixing frame 69 is fixedly connected to the inner wall of the protective cover 2 , and the upper and lower ends of the push plate 71 are respectively slidably connected with a guide rod 70 , and the two ends of the guide rod 70 are respectively connected with the fixing frame. 69 fixed connection;

A stable shaft 53 is slidably connected to the right end of the fixing frame 69 , and the lower end of the stable shaft 53 is fixedly connected to the surface of the linkage plate 52 .

When the ratchet gear 31 rotates, the lower connecting claw 49 can be driven to rotate through the transmission of the first main transmission belt 44 and the first driven pulley 46, and when the upper connecting claw 50 is engaged with the lower connecting claw 49, it can drive the active dial The wheel 29 rotates, the two sides corresponding to the surface of the matching shaft 51 are respectively provided with second limit grooves, the upper end of the upper connecting claw 50 is provided with a through hole, and the two sides corresponding to the inner wall of the through hole are respectively provided with a second limit groove When the upper connecting claw 50 rotates, it can drive the matching shaft 51 to rotate, and then drive the active dial 29 to rotate, and the upper connecting claw 50 can also be matched The surface of the shaft 51 moves up and down; the linkage plate 52 is used to connect the upper connecting claw 50 and the piston rod 54. When the piston rod 54 moves up and down, it can drive the upper connecting claw 50 to move synchronously, and the push plate 71 is used to control the piston rod 54 to move. Moving up and down, when the second cooperating pin 58 is at the bottom of the pushing groove 72, the upper connecting claw 50 and the lower connecting claw 49 are in an engaged state. Since the pushing groove 72 is in a V-shaped structure, no matter whether the pushing plate 71 moves forward or backward Backward movement, under the cooperation of the push groove 72 and the second matching pin shaft 58, the piston plate 55 can be driven to move upward, and then the piston rod 54 can be driven to move upward synchronously, so that the upper connecting claw 50 moves upward and the lower connecting claw 49 disengages; The guide rod 70 is used to install the push plate 71 and to limit the position of the push plate 71, so that the push plate 71 can only move forward and backward, the fixing frame 69 is used to install the guide rod 70 and the piston cylinder 56; the return spring 57 is used for time up The engagement of the connecting claw 50 and the lower connecting claw 49 is kept stable, so that the upper connecting claw 50 and the lower connecting claw 49 can always remain engaged when the push plate 71 is not stressed; sex.

The commutator frame 59 has a V-shaped structure. The front and rear sides of the upper right end of the commutator frame 59 are respectively connected with meshing gears 67 that can rotate synchronously. The rotation directions of the two meshing gears 67 are opposite. A meshable cooperating gear 27 is provided between the meshing gears 67 , and the cooperating gear 27 is fixedly connected to the left end of the transmission worm 26 ; It is hinged with the rear end of the push plate 71; the right end of the reversing frame 59 is fixedly connected with an operating rod 73, and a rectangular movable port is opened on the surface of the protective cover 2 corresponding to the upper end of the operating rod 73, so The operating rod 73 extends to the upper side of the protective cover 2 through the rectangular movable opening, and an operating handle 74 is fixedly connected to the left side of the upper end of the operating rod 73 .

The upper side of the commutator frame 59 and the left ends corresponding to the two meshing gears 67 are respectively rotatably connected with first transmission pulleys 60 , and the two first transmission pulleys 60 are respectively coaxially fixed with the corresponding meshing gears 67 . Then, the lower sides of the two first transmission pulleys 60 are respectively provided with second transmission pulleys 61, and the two second transmission pulleys 61 are respectively rotatably connected with the left end of the reversing frame 59. The first transmission pulleys The surface of 60 is respectively sleeved with a third transmission belt 62, the lower ends of the third transmission belt 62 are respectively sleeved with the surface of the second transmission pulley 61, and the right end of the reversing frame 59 is in phase with the two second transmission pulleys 61. Corresponding surfaces are respectively rotatably connected with opposite gears 66. The two opposite gears 66 are respectively fixed coaxially with the corresponding second transmission pulleys 61. The two opposite gears 66 are meshed with each other. The left end of the transmission pulley 61 is fixedly connected with a transmission gear 65 , the lower side of the transmission gear 65 is engaged with a driving gear 64 that can rotate synchronously with the ratchet gear 31 , and the driving gear 64 is connected to the lower end of the commutator frame 59 . Coaxial rotation connection, the left end of the drive gear 64 is coaxially fixedly connected with a second transmission bevel gear 63, the lower side of the second transmission bevel gear 63 is meshed with the first transmission bevel gear 48, the first transmission The bevel gear 48 is rotatably connected to the inner bottom end of the bottom box 1 , and the lower side of the first transmission bevel gear 48 is coaxially and fixedly connected with a second driven pulley 47 . A second active belt is sleeved on the surface, and the other end of the second active belt is sleeved with the surface of the driving pulley 43 on the lower side.

The operating handle 74 is used to control the operating lever 73 to swing back and forth, and the operating lever 73 is used to control the commutator frame 59 to swing back and forth. A transmission bevel gear 48 rotates, and then through the meshing of the first transmission bevel gear 48 and the second transmission bevel gear 63, the driving gear 64 can be driven to rotate. When the driving gear 64 rotates, it drives the transmission gear 65 to rotate, and then drives the same as the transmission gear 65. The relative gear 66 of the shaft rotates. Since the two relative gears 66 are meshed with each other, when one of the relative gears 66 rotates, the second relative gear 66 can rotate synchronously and rotate in the opposite direction, so that it can be coaxial with the relative gear 66. The second drive pulley 61 rotates synchronously and the direction of rotation is also opposite, the second drive pulley 61 and the first drive pulley 60 can rotate synchronously under the action of the third drive belt 62, and drive the two meshing gears 67 synchronously rotate and realize The effect of the opposite rotation direction of the two meshing gears 67, because the two meshing gears 67 rotate in opposite directions, so when the commutator frame 59 swings back and forth to make the two meshing gears 67 mesh with the inner matching gear 27, the matching gear 27 The direction of the second rotation is also opposite. The guide cylinder 20 can be driven to rotate through the engagement of the transmission worm 26 and the transmission worm wheel 25, and the direction of each rotation is also opposite, so that the placing table 3 can be raised and lowered.

The front end of the bottom box 1 is fixedly connected with a sub-board 77 , the front end of the pedal 39 is hinged to the front side of the sub-board 77 , the rear end of the pedal 39 is inclined upward and is hinged with a push plate 38 . The other end of the plate 38 is hinged with a push slide 37, the push slide 37 is slidably connected to the inner bottom end of the bottom box 1, and the upper end of the push slide 37 is hinged with two push hinge rods 36, two push hinge rods. The other end of the 36 is inclined to the outside and is respectively hinged with a linking hinge rod 35. The two linking hinge rods 35 are respectively connected to the upper end of the ratchet gear 31. The middle part is rotatably connected; A push pawl 32 and a pull pawl 33 are engaged, and the front ends of the push pawl 32 and the pull pawl 33 are respectively coaxially hinged with the hinge points of the linkage hinge rod 35 and the push hinge rod 36 . The upper ends of the pushing pawl 32 and the pulling pawl 33 are respectively fixedly connected to the tension spring 34, and the other ends of the two tension springs 34 are respectively fixedly connected to the surface of the corresponding interlocking hinge rod 35; An installation slider 40 is fixedly connected to the bottom, an installation chute is provided at the bottom of the bottom box 1 , the installation slider 40 is slidably connected to the installation chute, and the rear end of the installation slider 40 is fixedly connected with a pusher A spring 42, the rear end of the push spring 42 is fixedly connected to the inner wall of the installation chute, the inside of the push spring 42 is provided with a spring shaft 41, and the surface of the spring shaft 41 is slidably connected to the surface of the installation slider 40 , the two ends of the spring shaft 41 are respectively fixedly connected with the inner wall of the installation chute.

An opening is provided on the surface of the protective cover 2 corresponding to the push plate 38 to provide a moving channel for the push plate 38. When the pedal 39 is stepped on, the push spring 42 is used to push the pedal 39 to reset, and the spring shaft 41 is used to prevent the push spring 42 from being pushed. It is bent when being compressed, and the sliding plate 37 can be driven to move back and forth repeatedly by stepping on the pedal 39 repeatedly. Pushing the pawl 32 and pulling the pawl 33 continuously drives the ratchet gear 31 to rotate in one direction, and when the sliding plate 37 is pushed to the front side, the pawl 32 pushes the ratchet gear 31 to rotate and the pawl 33 is pulled to continuously interact with the ratchet gear 31. When the sliding plate 37 is pushed to the rear side, the ratchet gear 31 can be driven to continue to rotate by pulling the pawl 33, and the pawl 32 is continuously engaged with the ratchet gear 31. The tension spring 34 is used to push the pawl 32 and pull the The ratchet claws 33 mesh with the ratchet gear 31 respectively. When the sliding plate 37 is pushed back and forth once, the ratchet gear 31 can be driven to rotate 180 degrees, and then the driving pulley 43 can be rotated 180 degrees, that is, half a circle. 43 can drive the first driven pulley 46 and the second driven pulley 47 to rotate one circle, i.e. three hundred and sixty degrees, respectively, when it rotates for half a circle, and then step on the pedal 39 once when the control platform 3 rotates intermittently to drive it. The placing table 3 rotates intermittently once, which is convenient for the user to control the rotation of the placing table 3 and enhances the convenience of the user; the bottom four corners of the bottom box 1 are respectively fixed with foot brake universal wheels, which are used to facilitate the movement of the device, the guide cylinder An auxiliary push rod 75 is fixedly connected to the upper end of the auxiliary push rod 75 , the front side of the auxiliary push rod 75 is bent upward, and a push handle 76 is fixedly connected to the upper end of the auxiliary push rod 75 to assist the user to move the device.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention pertains can make various modifications or additions to the described specific embodiments or replace them in similar manners, but will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (9)

1. An environmental quality test analysis bench for teaching, includes end box (1), its characterized in that: a placing table (3) which can be lifted and can intermittently rotate is arranged on the upper side of the bottom box (1), and the lifting and the intermittent rotation of the placing table (3) can be respectively and independently carried out; a ratchet gear (31) is rotatably connected to the bottom of the bottom box (1), a pedal (39) capable of repeatedly swinging up and down is mounted on the front side of the bottom box (1), a structure capable of rotating in a single direction of the ratchet gear (31) can be formed when the pedal (39) swings up and down, a structure capable of intermittently rotating the placing table (3) can be formed when the ratchet gear (31) rotates in a single direction, a reversing frame (59) capable of swinging back and forth is mounted on the front side of the ratchet gear (31), the lower end of the reversing frame (59) is hinged to the inner wall of the bottom box (1), and when the ratchet gear (31) rotates in a single direction, the reversing frame (59) is controlled to swing back and forth to control the placing table (3) to stop rotating and lift; the middle part of the upper end of the placing table (3) is fixedly connected with a mounting column (8), the upper side and the lower side of the surface of the mounting column (8) are respectively and rotatably connected with connecting pipes (12) capable of rotating synchronously, the rotating directions of the two connecting pipes (12) are opposite, the surfaces of the two connecting pipes (12) are respectively and uniformly and fixedly connected with a plurality of connecting plates (13), the connecting plates (13) on the upper side and the lower side are respectively and alternately distributed, and the outer ends of the connecting plates (13) on the upper side and the lower side are respectively and sequentially and fixedly connected with a second isolation plate (5) and a first isolation plate (4); a placing plate (6) is arranged on the upper side of the placing table (3).

2. An environmental quality test analysis bench for teaching according to claim 1, wherein: the surface of the connecting pipe (12) on the upper side and the lower side is fixedly connected with an upper connecting bevel gear (14) and a lower connecting bevel gear (16) in sequence respectively, the upper connecting bevel gear (14) and the lower connecting bevel gear (16) are meshed with a reversing bevel gear (15), the reversing bevel gear (15) is rotatably connected to the surface of the mounting column (8), the upper end of the mounting column (8) is fixedly connected with a limiting gear (9), the upper end of the connecting plate (13) on the upper side is slidably connected with a limiting tooth block (10) respectively, the inner end of the limiting tooth block (10) is meshed with the limiting gear (9) respectively, the outer end of the limiting tooth block (10) is fixedly connected with a limiting spring (11) respectively, and the outer end of the limiting spring (11) is fixedly connected with the connecting plate (13) respectively.

3. An environmental quality test analysis station for teaching use according to claim 1, wherein: the upper end of the bottom box (1) is fixedly connected with a protective cover (2), the upper end of the protective cover (2) is rotatably connected with a guide cylinder (20), the lower side of the surface of the guide cylinder (20) is positioned in the protective cover (2), the lower end of the guide cylinder (20) is fixedly connected with a transmission worm wheel (25), the rear side of the transmission worm wheel (25) is meshed with a transmission worm (26), and the transmission worm (26) is rotatably connected with the inner wall of the protective cover (2); a matching pipe (21) capable of moving up and down is installed inside the guide cylinder (20), a spiral guide groove (24) is formed inside the guide cylinder (20), a first matching pin shaft (23) is rotatably connected to the lower side of the surface of the matching pipe (21), the other end of the first matching pin shaft (23) is meshed with the lower side of the spiral guide groove (24), a stabilizing plate (17) is fixedly connected to the upper end of the matching pipe (21), the upper end of the stabilizing plate (17) is rotatably connected with the bottom of the placing table (3), a telescopic rod (19) is fixedly connected to the non-circle center position of the lower end of the stabilizing plate (17), and the lower end of the telescopic rod (19) is fixedly connected with the surface of the protective cover (2); the inner part of the matching pipe (21) is rotatably connected with an inner transmission pipe (18), the upper side of the surface of the inner transmission pipe (18) is rotatably connected with the middle part of the stabilizing plate (17), the upper end of the inner transmission pipe (18) is fixedly connected with the bottom of the placing table (3), the inner part of the inner transmission pipe (18) is slidably connected with an inner transmission shaft (22) capable of rotating intermittently, when the inner transmission shaft (22) rotates intermittently, the inner transmission pipe (18) can be driven to rotate synchronously, the inner transmission pipe (18) can move up and down on the surface of the inner transmission shaft (22), the lower end of the inner transmission shaft (22) is fixedly connected with a grooved pulley (28), the grooved pulley (28) is rotatably connected with the inner wall of the bottom box (1), the front side of the grooved pulley (28) is engaged with a driving dial wheel (29), and the upper end of the grooved pulley (28) is coaxially and rotatably connected with a mounting plate (30), the other end of the mounting plate (30) is rotationally connected with the driving thumb wheel (29), and when the ratchet gear (31) rotates, the driving thumb wheel (29) can be driven to rotate.

4. An environmental quality test analysis station for teaching as claimed in claim 3 wherein: the coaxial rigid coupling in lower extreme of driving thumb wheel (29) has cooperation axle (51), the surperficial sliding connection of cooperation axle (51) has last connecting claw (50) that can reciprocate, the downside meshing of going up connecting claw (50) has lower connecting claw (49), the downside of lower connecting claw (49) is with first driven pulley (46) of axle center fixedly connected with, the lower extreme of first driven pulley (46) with end box (1) inner wall rotates and is connected, the lower extreme of ratchet wheel (31) is respectively with axle center fixedly connected with two driving pulley (43), the upper and lower both sides driving pulley (43) surface overlap respectively in proper order has first main drive belt (44) and second main drive belt (45), the other end of first main drive belt (44) with first driven pulley (46) surface cup joints.

5. An environmental quality test analysis bench for teaching according to claim 4 wherein: the upper end of the upper connecting claw (50) is rotatably connected with a linkage plate (52), the other end of the linkage plate (52) is fixedly connected with a piston rod (54), a piston cylinder (56) is arranged on the upper side of the piston rod (54), the upper end of the piston rod (54) is fixedly connected with a piston plate (55), the piston plate (55) is slidably connected inside the piston cylinder (56), the upper end of the piston plate (55) is fixedly connected with a return spring (57), and the upper end of the return spring (57) is fixedly connected with the upper end inside the piston cylinder (56); the surface of the piston cylinder (56) is provided with a rectangular sliding groove, the left side of the surface of the piston cylinder (56) is connected with an installation block in a sliding mode, the installation block is fixedly connected with the piston plate (55), the left end of the installation block is connected with a second matching pin shaft (58) in a rotating mode, a pushing plate (71) capable of moving back and forth is arranged on the left side of the piston cylinder (56), a V-shaped pushing groove (72) is formed in the surface of the pushing plate (71), the second matching pin shaft (58) is located at the bottommost part of the pushing groove (72), and the second matching pin shaft (58) is connected with the inner wall of the pushing groove (72) in a sliding mode; a fixed frame (69) is fixedly connected to the surface of the piston cylinder (56), the front end of the fixed frame (69) is fixedly connected with the inner wall of the protective cover (2), the upper end and the lower end of the pushing plate (71) are respectively connected with a guide rod (70) in a sliding manner, and the two ends of the guide rod (70) are respectively fixedly connected with the fixed frame (69);

the right end of the fixed frame (69) is connected with a stable shaft (53) in a sliding mode, and the lower end of the stable shaft (53) is fixedly connected with the surface of the linkage plate (52).

6. An environmental quality test analysis station for teaching use according to claim 5, wherein: the front side and the rear side of the right end of the upper side of the reversing frame (59) are respectively and rotatably connected with meshing gears (67) capable of synchronously rotating, the rotating directions of the two meshing gears (67) are opposite, a meshing gear (27) capable of meshing is arranged between the two meshing gears (67), and the meshing gear (27) is fixedly connected with the left end of the transmission worm (26); the front end of the reversing frame (59) is hinged with a pull rod (68), and the front end of the pull rod (68) is hinged with the rear end of the push plate (71); the right-hand member fixedly connected with action bars (73) of switching-over frame (59), with action bars (73) upper end is corresponding the rectangle activity mouth has been seted up on the surface of protection casing (2), action bars (73) pass through the rectangle activity mouth extends to the upside of protection casing (2), the upper end left side fixedly connected with operation grab handle (74) of action bars (73).

7. An environmental quality test analysis station for teaching use according to claim 6, wherein: the reversing frame (59) is of a V-shaped structure, the upper side of the reversing frame (59) and the left ends corresponding to the two meshing gears (67) are respectively and rotatably connected with a first transmission belt wheel (60), the two first transmission belt wheels (60) are respectively and coaxially fixedly connected with the corresponding meshing gears (67), the lower sides of the two first transmission belt wheels (60) are respectively provided with a second transmission belt wheel (61), the two second transmission belt wheels (61) are respectively and rotatably connected with the left end of the reversing frame (59), the surface of each first transmission belt wheel (60) is respectively sleeved with a third transmission belt (62), the lower end of each third transmission belt (62) is respectively sleeved with the surface of each second transmission belt wheel (61), the right end of the reversing frame (59) and the corresponding surface of each of the two second transmission belt wheels (61) are respectively and rotatably connected with a relative gear (66), the two opposite gears (66) are respectively and coaxially and fixedly connected with corresponding second transmission belt wheels (61), the two opposite gears (66) are meshed with each other, the left end of the second transmission belt wheel (61) at the front side is fixedly connected with a transmission gear (65), the lower side of the transmission gear (65) is meshed with a driving gear (64) which can synchronously rotate with the ratchet gear (31), the driving gear (64) is coaxially and rotatably connected with the lower end of the reversing frame (59), the left end of the driving gear (64) is coaxially and fixedly connected with a second transmission bevel gear (63), the lower side of the second transmission bevel gear (63) is meshed with a first transmission bevel gear (48), the first transmission bevel gear (48) is rotatably connected with the bottom end inside the bottom box (1), and the lower side of the first transmission bevel gear (48) is coaxially and fixedly connected with a second driven belt wheel (47), and a second driving belt is sleeved on the surface of the second driven belt wheel (47), and the other end of the second driving belt is sleeved with the surface of the driving belt wheel (43) on the lower side.

8. An environmental quality test analysis station for teaching use according to claim 1, wherein: the front end of the bottom box (1) is fixedly connected with an auxiliary plate (77), the front end of the pedal (39) is hinged to the front side of the auxiliary plate (77), the rear end of the pedal (39) inclines upwards and is hinged with a push plate (38), the other end of the push plate (38) is hinged with a push sliding plate (37), the push sliding plate (37) is connected to the bottom end inside the bottom box (1) in a sliding mode, the upper end of the push sliding plate (37) is hinged with two push hinge rods (36) respectively, the other ends of the two push hinge rods (36) incline outwards and are hinged with linkage hinge rods (35) respectively, and the two linkage hinge rods (35) are respectively and jointly connected with the middle part of the upper end of the ratchet gear (31) in a rotating mode; the left side and the right side of the ratchet gear (31) are respectively and sequentially meshed with a pushing pawl (32) and a pulling pawl (33), the front ends of the pushing pawl (32) and the pulling pawl (33) are respectively and coaxially hinged with hinged points of the linkage hinged rod (35) and the pushing hinged rod (36), the upper ends of the pushing pawl (32) and the pulling pawl (33) are respectively and fixedly connected with a tension spring (34), and the other ends of the two tension springs (34) are respectively and fixedly connected with the surfaces of the corresponding linkage hinged rods (35); promote bottom fixedly connected with installation slider (40) of slide (37), the installation spout has been seted up to the bottom of end box (1), installation slider (40) with installation spout sliding connection, the rear end fixedly connected with of installation slider (40) promotes spring (42), the rear end that promotes spring (42) with installation spout inner wall fixed connection, the inside that promotes spring (42) is provided with spring axle (41), spring axle (41) surface with installation slider (40) surface sliding connection, the both ends of spring axle (41) respectively with installation spout inner wall fixed connection.

9. An environmental quality test analysis station for teaching as claimed in claim 3 wherein: the right side of the surface of the placing plate (6) is fixedly connected with a connecting frame (7), and the lower end of the connecting frame (7) is fixedly connected with the upper end of the matching pipe (21).

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